Abstract: The present invention relates to a control system comprising a control interface between one or more wind turbine generators and a power grid, where the wind turbine generators are coupled to the power grid and contribute to the power production of the grid. The control interface is arranged to receive a set of event data. In embodiments, the set of event data may be any data available to a SCADA system. The set of event data is analyzed in terms of predetermined event rules comprising at least one predefined event condition and a set of adaptive event conditions. Based on the analysis an event output is provided in order to control a parameter of the one or more wind turbine generators. In embodiments, the control system may be implemented in, or in connection with a SCADA system, moreover, the event output may be based on fuzzy logic, a neural network or statistical analysis.

Abstract: A power plant controller (36) is described. The power plant controller (36) controls a power generation system (10) having one or more power generators (12) and an energy storage system (22), and provides a utility grid or transmission system operator with the capability to select the droop response provided by the power generation system. Accordingly, an operator can request a specific generator droop response in order to provide appropriate frequency and grid control services. The power plant controller (36) operates in real time determining one or more power characteristics of the power generation system (10). Based on these characteristics and an indication of a future predicted power output for the power generation system, the power plant controller can take the necessary steps to ensure that the power generation system is capable of responding with the selected droop response, or can advise the operator that a different droop is preferred.

Abstract: A system includes at least one variable speed generator system configured to provide power to a load bus and at least one fixed speed generator configured to provide power to the load bus. The system also includes a solid state generator (SSG) system including at least one energy storage device and a converter coupled to the at least one energy storage device and configured to transfer power between the at least one energy storage device and the load bus. The system further includes a control system configured to control the at least one variable speed generator system, the at least one fixed speed generator and the SSG system responsive to changes in a load on the load bus.

Abstract: Methods, circuits, apparatus, and systems related to a hybrid driving and controlling circuit are disclosed. In one embodiment, a hybrid driving and controlling circuit in a double power supply system includes first and second power supplies and at least one load, and the circuit can include: (i) a controller coupled to a hybrid switcher that enables energy transfer from the first and second power supplies; (ii) when a determined energy of the first power supply is sufficient, the controller can control the hybrid switcher to transfer energy from the first power supply to the second power supply; and (iii) when the determined energy of the first power supply is insufficient, the controller can control the hybrid switcher to transfer energy from the second power supply to the at least one load.

Abstract: A method for controlling a wind power plant in case of a frequency drop in a utility grid to which the wind turbines are connected is provided. The method includes combining demand response, inertial response and spinning reserve for given wind speeds in order for wind power plants to deliver fast aggregate under frequency response for a wide wind speed range with minimal recovery time and minimal production loss at each wind speed.

Abstract: A method of determining an operation of at least one of a plurality of generators in a power generation system. The method includes identifying a system parameter that is related to operation of the power generation system; and determining which of the plurality of generators to operate to minimize fuel consumption of the power generation system based on the system parameter. Other methods include identifying a system parameter that is related to operation of the power generation system; and determining which of the plurality of generators to operate by optimizing an operating variable of the power generation system based on the system parameter.

Abstract: A method for controlling a temperature of steam for a steam power plant is provided. A state regulator controls the temperature of the steam at an outlet of a superheater using a feedback of multiple medium states of the steam in the superheater. An aim herein is to achieve a stable and precise control of the steam temperature. This is achieved in that the state regulator is a linear regulator, the feedback matrix of which is ascertained such that the regulator has the control quality of a linear-quadratic regulator.

Abstract: A method of controlling a dynamic physical system comprising a plurality of variable quantities. A model of the system comprising a plurality of variables representing the variable quantities, and a plurality of respective rate equations that describe the rate of change of the variables, is obtained. A control term in at least one rate equation from the plurality of rate equations is identified. A rate control function is derived from, for at least one of the variables in the rate equation, the proportion of the variable to the growth rate of the rate equation, and the rate control function is applied to the control term to provide a stabilised control term. The dynamic physical system is then controlled by modifying at least one of the quantities represented by the variables in the control term, so that the control term derived from the modified quantities is substantially the same as the stabilised control term.

Abstract: In one aspect, a method of selecting wind turbine generators in a wind park for curtailment of output power to provide a wind reserve comprises providing a wind park comprised of a plurality n of wind turbines each having an individual possible power output and the wind park has a combined possible power output of X, where X comprises a summation of the individual possible power output of the n wind turbines; setting a power setpoint Y for the wind park, wherein Y?X and X?Y comprises a wind reserve; selecting, on a non-spatial basis, n?1 or fewer wind turbines from the wind park for power output curtailment; and curtailing power output of one or more of the selected n?1 or fewer wind turbines such that a total power output of the wind park comprises Y.

Abstract: A method for controlling a wind farm having a power output constraint is disclosed. The method may include operating a plurality of wind turbines within the wind farm. Each wind turbine may include a baseline power output and a maximum power output. The baseline power output may be defined by a control-limited power curve as a function of wind speed. In addition, the method may include comparing a total power output for the wind farm to the power output constraint of the wind farm, controlling the operation of at least one wind turbine of the plurality of wind turbines to provide an increased power output for the at least one wind turbine when the total power output is less than the power output constraint.

Abstract: The present invention relates to an energy resource-grid-load automatic control system of smart microgrid and control methods thereof, which belong to the field of microgrid control and electrical technology. The energy resource-grid-load automatic control system comprises a distributed renewable energy power generation module, a distributed renewable energy inverter module, a conventional power generation module, a user load module, a bidirectional grid-connected control module, a distributed renewable energy intelligent optimizing power generation control module, an energy storage module, an intelligent energy storage unit adjuster and a storage battery pack.

Abstract: In a first aspect, the present invention provides a method of operating a wind turbine having a rotor with a plurality of blades, a nacelle, one or more pitch systems for pitching the blades, a system for determining a speed of the rotor, and a system for determining a fore-aft speed of the nacelle. The method comprises determining the speed of the rotor, determining the fore-aft speed of the nacelle, and calculating a difference between the determined speed of the rotor and a predefined speed of reference of the rotor. After, pitch commands are obtained by performing a PID control of this calculated difference of speeds, said PID control being tuned for adapting the sensitivity of the PID control as a function of the determined fore-aft speed of the nacelle. Then, the one or more pitch systems pitch the blades in accordance with said obtained pitch commands.

Abstract: The invention broadly encompasses a system including an aggregator of distributed micro-generator energy sources, a monitor of distributed micro-generator energy sources, the monitor communicates micro-generator energy usage data with a wholesale power producer and a micro-generator asset owner, and a manager of distributed micro-generator energy sources, the manager facilitates control of a micro-generator energy source by assigning a specific micro-generator energy source to a wholesale power producer, wherein the monitor tracks and reports micro-generator energy source use by a wholesale producer.

Abstract: A method of controlling a plurality of gensets during a failsafe condition is provided. The method may include operating one or more of the gensets according to a modified isochronous control scheme, and operating a remainder of the gensets according an adaptive droop control scheme. The modified isochronous control scheme may include varying the frequency of each isochronous genset with respect to load for lower-range loads and upper-range loads, and maintaining the frequency of each isochronous genset at nominal frequencies for mid-range loads. The adaptive droop control scheme may include adjusting the frequency of each droop genset to match the frequency of the isochronous gensets, and varying the load of each droop genset with respect to frequency for lower-range loads and upper-range loads.

Abstract: Systems and methods for loading a steam turbine are provided. A method may include: receiving a turbine loading factor; receiving a current steam turbine exhaust temperature; determining a steam flow ramping rate parameter and a steam temperature ramping rate parameter based at least in part on the turbine loading factor and the current steam turbine exhaust temperature, wherein the steam flow ramping rate parameter and the steam temperature ramping rate parameter are determined based at least in part on an inverse relationship between the steam flow ramping rate parameter and the steam temperature ramping rate parameter. The method may further include controlling at least one of: (a) steam flow to the steam turbine based at least in part on the steam flow ramping rate parameter; or (b) steam temperature to the steam turbine based at least in part on the steam temperature ramping rate parameter.

Abstract: A remote monitoring and control system comprising synchronized wireless MESH technology for remote monitoring and control of utility grids (e.g., utility meters), commodity distribution networks, industrial equipment, and infrastructure including remote disconnection/connection and self-generating power.

Abstract: A power management system installed in a structure and placed electrically between at least one circuit breaker and at least one circuit supplying at least one electrical load, the system comprising a digital controller having a power source; at least one switch communicating with a digital controller and positioned between an electrical load and a breaker to selectively energize at least one circuit; a display communicating with the digital controller; and a user interface communicating with the digital controller, whereby the digital controller selectively engages and disengages the power to selected circuits by communication with at least one switching device using user inputs entered through the interface enabling a user to manage power consumption within the structure.

Abstract: A method for tuning a combustor of a gas turbine engine based on one or more monitored operating conditions is provided. One or more operating conditions of the gas turbine engine are monitored. The monitored operating conditions may include, for example, a low frequency tone, a high frequency tone, and a ratio of the low frequency tone to the high frequency tone. It is determined whether the ratio of the low frequency tone to the high frequency tone is within a first predefined normal range. If the ratio of the low frequency tone to the high frequency tone is within the first predefined normal range, a determination is made not to tune the gas turbine engine. But, if the ratio of the low frequency tone to the high frequency tone is not within the first predefined normal range, a determination is made to tune the gas turbine engine.

Abstract: Methods are provided for ensuring non-excessive variation of a gradient of an applied split bias versus firing temperature of a gas turbine engine. It is determined that an incremental split bias step is to be taken, and a current firing temperature of the gas turbine engine is identified on a graph. A first difference between a split schedule and an applied schedule gradient is calculated using lower firing temperatures than the current firing temperature, and a second difference is calculated using higher firing temperatures. If the first difference exceeds a predetermined limit, the incremental split bias step is not allowed at a lower firing temperature, and similarly, if the second difference exceeds a predetermined limit, the incremental split bias step is not allowed at a higher firing temperature.

Abstract: A hybrid generator may include a fuel powered engine; an alternator comprising a permanent magnet alternator head with at least 90% mechanical-to-electric efficiency, the alternator being coupled to the engine; one or more batteries to receive and store power routed from the alternator; a controller to maintain efficient operating speed of the engine at prime power; and a power converter or inverter to convert stored energy from the batteries into usable electricity for AC or DC loads.

Abstract: Disclosed is a computation device for optimizing photovoltaic power generation by computing a wire connection pattern of a plurality of photovoltaic modules, the computation device including a parameter acquisition unit configured to acquire a parameter including at least a current value from each of the photovoltaic modules; a class classification unit configured to perform class classification of the photovoltaic modules based on the parameter acquired by the parameter acquisition unit; and a wire connection pattern selection unit configured to select the wire connection pattern based on the class classification performed by the class classification unit.

Abstract: A control system of a technical installation including at least one field device which makes available at least two redundant protocol values that are converted by the control system into a single non-redundant functional value is provided. The control system is provided with at least two redundant communication channels for converting the at least two redundant protocol values, the channels controlling the respective protocol value with respect to its exactitude and transmitting an exact protocol value.

Abstract: A method for controlling a wind turbine is provided. The method includes monitoring an electrical quantity at an output terminal of the wind turbine. The electric quantity has an amplitude and periodically varying with a grid frequency. The method further includes detecting an oscillation of the amplitude and decreasing active power output from the wind turbine at the output terminal depending on the detected oscillation.

Abstract: An installation for producing electrical energy is provided with an energy storage means and a control method of such an installation. The installation includes an electrical energy generator that connects to a distribution network and the energy storage means. The installation also comprises a controller controlling the operation of the energy storage means and the connection of the energy storage means to the electrical energy generator and the network. The controller receives a set of information from the network or, energy storage means, and the electrical energy generator, and from the network manager to control the supply of the electrical energy generator and a set of auxiliary equipment of the installation from the energy storage means in the event of power failure.

Abstract: A control system for use in adapting the operation of a gas turbine is provided. The control system is configured to be coupled to at least one component of the gas turbine. The gas turbine is coupled to a power grid having a standardized frequency. The control system includes a processor and a memory coupled to the processor. The memory includes processor-executable instructions that, when executed by the processor, cause the control system to store a status of the at least one component of the gas turbine and generate and store a first operating setting for the at least one component. The first operating setting corresponds to a first frequency of the power grid that is less than the standardized frequency.

Abstract: Systems and methods for performing islanding operations are usable to monitor and collect plant loads and turbine loads of a power plant. Such monitoring and collecting can be used to preemptively determine islanding configurations. According to one embodiment of the invention, a system can be provided. The system can be operable to receive power generation unit information, receive power plant information of the power plant, determine an islanding configuration for the power plant, transmit the islanding configuration to the at least one power generation unit of the power plant, receive breaker status information of at least one breaker coupled to the at least one power generation unit of the power plant and for all breakers connecting power plant to an external grid, and control at least one power generation unit of the power plant.

Abstract: Control device for hydraulic turbines configured to adjust the resistant torque provided by the generator to the movement of the impeller of an hydraulic turbine (3) so that a stable pressure is set at the inlet (Pi) and at the outlet (Po) regardless of the circulating flow rate (Q), and to adjust the electrical energy produced by the turbine to achieve the desired hydraulic behavior, the device comprising a control means (100) and a power means (200); wherein said control means (100) is connected to means for detecting the pressure at the inlet (Pi) and at the outlet (Po) and to a flow-meter (1) for obtaining the circulating flow rate (Q), as well as to means for measuring the power (2) of the turbine (3); all this, in such a way that the control means (100) acts on the power means (200) for causing the application of the braking torque necessary to maintain a stable set-point value on the turbine (3).

Abstract: An energy control system (1) includes a photovoltaic power generation unit (10) that is connected to the grid and generates power using sunlight, a gas power generation unit (20) that generates power using gas, and a control unit (40) that performs control to supply a load by prioritizing the power generated by the gas power generation unit (20) when sale of the power generated by the photovoltaic power generation unit (10) to the grid is possible and to supply the load by prioritizing the power generated by the photovoltaic power generation unit (10) when the sale is not possible.

Abstract: The embodiments described herein include a system and a method. In one embodiment, a system includes an industrial controller configured to control a first field device. The first field device includes an actuator and a positioner coupled to the actuator. The positioner is configured to position the actuator. The first field device is configured to detect an undesired condition and to communicate the undesired condition to the industrial controller by using a ReadBack facility of the first field device.

Abstract: A cogeneration system comprising a power generation unit, a thermal generation unit thermally coupled to the power generation unit, a plurality of renewable energy conversion units, and a power distribution unit configured to receive and distribute power from the power generation unit, thermal generation unit and the renewable energy conversion unit where the power distribution unit reduces the amount of power produced by the power generator based on the amount of power provided by the renewable energy conversion units.

Abstract: The present invention includes a Computer Assisted Reset (CAR) system that allows a central operations team to remotely reset turbine faults across multiple wind turbine platforms and SCADA systems with a single interface. The system also allows automatic resets to occur. One aspect of the invention includes a Modbus to OPC Translator. The translator permits the implementation of a system where a PLC located at wind turbine control sites can accept control messages or commands organized or formatted in accordance with the Modbus protocol and sent over an Internet Protocol connection, with the translator receiving the requests through the PLC and generating an appropriate OPC (“OLE Process Control”) request. The OPC request may then be passed onto a corresponding OPC server residing in the SCADA system for each wind turbine control site.

Abstract: The invention relates to a method of controlling a wind turbine having a rotor with pitchable wind turbine blades and a generator for producing power, where a pitch reference value for the wind turbine blades is determined, and an operational parameter representing a loading on the wind turbine rotor exerted by the wind is measured at time intervals. A variation parameter reflecting a variation of the operational parameter over time is determined and used in the determination of a minimum pitch limit value of the pitch reference value. The wind turbine is then controlled according to the pitch reference value only if the pitch reference value is above or equal to the minimum pitch limit value, and otherwise according to the minimum pitch limit value.

Abstract: A wind turbine which is composed of several subunits is provided. Each of the several subunits includes a controller. Each of the controllers is adapted to operate in a cooperative mode and in an isolated mode. In the cooperative mode, one of the controllers operates as a master controller and the remaining controllers operate as slave controllers. In the isolated mode, each subunit is exclusively controlled by its respective controller, wherein each of the controllers acts as an independent master controller for its subunit. Further, a method for operating a wind turbine which includes at least two subunits is provided. Each of the at least two subunits includes at least one sensor, at least one actuator and a controller. The method for operating the wind turbine is carried out independently in each subunit and includes detecting at least one sensor signal; and determining and transferring a command to at least one actuator.

Abstract: The present invention relates to a method for curtailing electrical power supplied from a wind turbine or a group of wind turbines to an associated power supply grid, the method comprising the steps of determining an available electrical power level from the wind turbine facility and setting a wind speed independent curtailment level. The curtailment level may be a percentage of an actual available electrical power level or a fixed power level. The method further comprises the step of operating the wind turbine facility in such a way that the generated electrical power supplied from the wind turbine facility equals the difference between an actual available electrical power level and the curtailment level. The present invention further relates to a wind turbine facility and a curtailing controller for carrying out the invention.

Abstract: Method of operating a wind farm comprising a plurality of wind turbines, each of the turbines having a plurality of blades, the method comprising determining a possible wake situation at a first wind turbine caused by a second wind turbine, the second wind turbine being located upstream of the first wind turbine, and individually adapting the blades of the second wind turbine such that a wake generated by the second wind turbine is deflected away from the first wind turbine.

Abstract: Embodiments of the invention generally relate to wind turbine generators, and more specifically to the deactivation of wind turbines in a wind turbine park. A wind park controller may be configured to retrieve data indicating fatigue experienced by each wind turbine of the wind turbine park, and deactivate those turbines determined to be the most fatigued, thereby increasing the lifetime of turbines in the wind turbine park.

Abstract: A controller for a building management system includes a system of rules for detecting faults in the building management system. The rules include content conditions and trigger conditions. The content conditions are not checked until one or more of the trigger conditions are met. A rule-based fault detection engine may be implemented by a low level building equipment controller. One or more thresholds for a rule may be automatically or manually adjusted.

Abstract: A method for operating a firing plant with at least one combustion chamber and at least one burner, especially a gas turbine, includes an operating characteristic for operating the combustion chamber close to the lean extinction limit defined as a burner group staging ratio (BGVRich). Pressure pulsations (PulsActual) measured in the combustion chamber are processed by a filter device (2) and converted into corresponding signals (PulsActual,Filter(t)). An exceeding/falling short of at least one pulsation limiting value (PulsLimit) is monitored by a monitoring device (3) and adapts a pulsation reference value (PulsRef) in dependence upon the monitoring. The processed pressure pulsations (PulsActual,Filter(t)) are then compared with the adapted pulsation reference value (PulsRef,adapt), and, from this, a correction value ?BGV is determined, by which the burner group staging ratio (BGVRich) is corrected, and as a result operation of the firing plant close to the lean extinction limit is realized.

Abstract: Damage is prevented on electric devices in a case where a generator is installed in a cold weather. A wind turbine generator includes a power supply unit connected to a utility grid via a switch gear; a utility grid voltage measuring unit provided between the power supply unit and the utility grid, for measuring a voltage of the utility grid; and a temperature measuring unit for obtaining an ambient temperature of the power supply unit. In a case where a measurement value of the temperature measuring unit or an ambient temperature of the power supply unit estimated based on the measurement value is smaller than a first temperature threshold determined based on a function guarantee temperature of the power supply unit and the voltage measured by the utility grid voltage measuring unit is smaller than a preset voltage threshold, the switch gear operates to interrupt the connection between the power supply unit and the utility grid.

Abstract: A real-time photovoltaic power plant control system and method of control for plant output, voltage regulation and/or power factor regulation. The system comprises a grid interface controller configured to receive power information from a power grid and provide commands for controlling at least one active or reactive power supplied to the power grid, a power plant controller configured to receive commands from the grid interface controller for and direct real-time output of the power plant, a plurality of local controllers connected to and controlled by the power plant controller, and a plurality of inverters each connected to supply power from at least one photovoltaic device to the power grid and arranged such that each local controller is connected to and controls at least one inverter, the inverters reporting status information in real-time back to the local controllers, and the local controller reporting status information in real-time back to the power plant controller.

Abstract: A present invention relates to a novel hybrid intelligent control system and method for power generating apparatuses, in which the control system comprises: a fuzzy sliding mode speed controller, embedded with a fuzzy inference mechanism so as to be used for controlling the speed of a power generating apparatus; and a radial basis function network (RBFN) pitch controller, being embedded with an on-line training RBFN so as to be used for controlling the pitch angle of a turbine coupled to the power generating apparatus. In a variable-speed energy conversion system using the aforesaid control system, the turbine can be driven to operate at its maximum efficiency by adjusting its blade pitch angle in response to the variation of the input flowing into the turbine, while allowing the shaft speed of the power generating apparatus to be controlled by a fuzzy interference mechanism so as to achieve its maximum power output.

Abstract: In a multiphase electrical power construction and assignment, a processor: determines a phase and voltage configuration for bi-directional power device pairs; determines a given bi-directional power device pair is to be coupled to a given phase connection based on the configuration; determines whether the given bi-directional power devices in the given bi-directional power device pair are to be coupled to each other; confirms that the given bi-directional power device pair is not coupled to any of the plurality of phase connections; couples the given bi-directional power device pair to the given phase connections, where power signals of the given bi-directional power device pair are synchronized with a power signal of the given phase connection; and in response to determining that the given bi-directional power devices are to be coupled to each other, couples each of the bi-directional power devices to a short bus.

Abstract: An energy storage system of an apartment building, an integrated power management system, and a method of controlling the integrated power management system. Power may be efficiently consumed by supplying remaining power stored in an energy storage system of each apartment to a common load.

Abstract: An electronic device is equipped with power generating means (unit), a secondary battery, a device, charging detection means (unit), battery voltage detection means (unit), and a time display control means (unit). The time display control means (unit) is equipped with an operation suspension portion, an operation resumption portion, a timer, a persistence display control portion and a timer updating portion. The timer updating portion updates the remaining time of the timer to the persistence time according to the detected voltage detected by the battery voltage detection means (unit) is longer than the remaining time, and operates the timer in operation as it is when the persistence time according to the detected voltage is equal to or less than the remaining time of the timer in operation.

Abstract: A method includes: determining a total power load from an electrical power consumption entity configured to receive all or a portion of the total power load from each of (i) an alternative energy source (“AES”), (ii) a power grid, and (iii) a rechargeable energy storage device. The AES and the power grid are connected using a reverse power relay. The method also includes: for a first time period, determining a first power supply from the AES. The first power supply is affected by natural events that are uncontrolled by a user. The method also includes in accordance with a determination that, during the first time period, the power supply from the AES exceeds the power load: storing an excess portion of the power supply in the energy storage device, without releasing electrical power from the AES to the power grid. The excess portion is less than the energy storage device's maximum capacity.

Abstract: A method for improving electrical generator efficiency using a rechargeable battery includes, at a computer system, determining a load from an electrical-power consumption entity for a prospective time period; and calculating a first supply from a renewable electrical power supply source for the same prospective time period. The renewable electrical-power supply source comprises one or more photovoltaic devices, and the renewable electrical-power supply source is independent from a power grid. The method also includes quantifying a deficiency in an ability of the first supply to satisfy the load during the prospective time period; and in accordance with the quantification of the deficiency in the ability of the first supply to satisfy the load during the prospective time period: optimizing a spinning reserve schedule for a plurality of power generators to thereby make up the deficiency. The optimization of the spinning reserve schedule improves the non-renewable energy consumption.

Abstract: A control system for an energy production facility includes a plant controller for receiving an indication of a measured power output of the energy production facility that includes power generators and produces output signals. The system also includes a processing unit operably coupled to the plant controller and responsive to executable computer instructions when executed on the processing unit cause the plant controller to: create an output signal that causes an energy storage device to discharge in the event power reserves of the power generators can not met the requested ramp down rate; and create an output signal that causes the energy storage device to charge up in the event that the power capability of the power generators can meet the requested ramp down rate.

Abstract: A retrofit kit for a turbine system is provided that includes a safety instrumented system (SIS) controller having a first plurality of functions and the SIS controller is configured to be coupled to a turbine-generator controller, wherein the SIS controller permits a startup function of the turbine-generator controller based on a plurality of inputs from a turbine.

Abstract: A method for operating a wind turbine having at least one blade includes determining an ambient air operating envelope and controlling a power output of the wind turbine at least partially based on the determined ambient air operating envelope. Determining an ambient air operating envelope includes measuring at least one of an ambient air temperature, an ambient air pressure, an ambient air humidity, and wind turbine power output. The method also includes comparing at least one of a measured ambient air temperature, a measured ambient air humidity and a measured ambient air pressure to predetermined ambient air temperature, pressure and humidity values. The method further includes referencing the predetermined ambient air temperature, pressure and humidity values to at least one operational parameter of the wind turbine. The method also includes determining if an existing wind turbine power output is within a range associated with the determined ambient air operating envelope.

Abstract: A building management system comprises a measurement system for measuring a demand for resources inside the building and a collecting system for harvesting natural resources available outside the building. The building management system is further provided with a storage system for storing surplus resources and a sensor system for measuring resource availability outside the building and/or resources stored in the storage system. Further, a controller arranged to receive data from the measurement system, the sensor system and the storage system is provided. The controller controls the collecting system based on said data to tune the collection of resources by the collection system to a present and/or an expected demand for resources.