Abstract: A grid interconnection system for a power grid includes: a storage battery; a power conversion device that converts power from the storage battery into AC; and an interconnection control device that supplies power from a commercial power supply to a load and supplies power from the power conversion device to the load when the commercial power supply fails. When the commercial power supply is restored, the interconnection control device starts supply of power from the commercial power supply to the load, and stops supply of power from the power conversion device to the load after the supply of power from the commercial power supply to the load is started.

Abstract: A measurement device that performs a predetermined measurement task together with a plurality of other measurement devices is provided. This measurement device is provided with a sampling phase generator for generating a sampling phase for instructing a timing of sampling, and a communication unit for communicating with at least one of the plurality of other measurement devices. The communication unit transmits the sampling phase generated by the sampling phase generator to at least one of the plurality of other measurement devices. The sampling phase generator is configured to generate a third sampling phase, using an operation that is based on a generated first sampling phase and a second sampling phase received by the communication unit from at least one of the plurality of other measurement devices.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? 0 ) + F ? ( s - j ? ? 0 ) 2 F ? ( s + j ? ? 0 ) - F ? ( s - j ? ? 0 ) 2 - F ? ( s + j ? ? 0 ) - F ? ( s - j ? ? 0 ) 2 ? j F ? ( s + j ? ? 0 ) + F ? ( s - j ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? 0 ) + F ? ( s - j ? ? 0 ) 2 F ? ( s + j ? ? 0 ) - F ? ( s - j ? ? 0 ) 2 - F ? ( s + j ? ? 0 ) - F ? ( s - j ? ? 0 ) 2 ? j F ? ( s + j ? ? 0 ) + F ? ( s - j ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: A monitoring device includes a receiving unit receiving effective power output value and reactive power output value from inverter devices, a setting unit setting effective power target value and reactive power output value for each inverter device, a first calculation unit calculating voltage phase command value for each inverter device, a second calculation unit calculating a voltage amplitude command value for each inverter device, a transmitting unit transmitting the voltage phase command value and voltage amplitude command value to relevant inverter devices, a distribution rate calculating unit calculating a distribution rate for each inverter device, and a total value calculating unit calculating effective power total value and reactive power total value for the inverter devices.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: An object is to provide a power system interconnection system and a method of installing the power system interconnection system that are able to supply a load with required power. A power system interconnection system comprises a storage battery an AC-DC power conversion device for the storage battery a charge and discharge station for an electric-powered automobile and an interconnection control device that are installed on a parking lot. The interconnection control device supplies a first load with power from at least one of the charge and discharge station and the AC-DC power conversion device in a case where the electric power system is in an emergency situation.

Abstract: A measurement device that performs a predetermined measurement task together with a plurality of other measurement devices is provided. This measurement device is provided with a sampling phase generator for generating a sampling phase for instructing a timing of sampling, and a communication unit for communicating with at least one of the plurality of other measurement devices. The communication unit transmits the sampling phase generated by the sampling phase generator to at least one of the plurality of other measurement devices. The sampling phase generator is configured to generate a third sampling phase, using an operation that is based on a generated first sampling phase and a second sampling phase received by the communication unit from at least one of the plurality of other measurement devices.

Abstract: A grid interconnection system for a power grid includes: a storage battery; a power conversion device that converts power from the storage battery into AC; and an interconnection control device that supplies power from a commercial power supply to a load and supplies power from the power conversion device to the load when the commercial power supply fails. When the commercial power supply is restored, the interconnection control device starts supply of power from the commercial power supply to the load, and stops supply of power from the power conversion device to the load after the supply of power from the commercial power supply to the load is started.

Abstract: A power system is provided for controlling a connection point power at a connection point with a power grid D. The power system includes a processing device that calculates a guidance command value for controlling the connection point power to achieve a target power, and a plurality of power control devices that each control the output power of mutually different types of control targets, based on a common guidance command value inputted from the processing device. Each of the plurality of power control devices calculates a target value of the output power, based on an optimization problem including a common evaluation function. The evaluation function includes the guidance command value and a design parameter for which a setting value set for each of the plurality of power control devices is substituted.

Abstract: An object is to provide a power system interconnection system and a method of installing the power system interconnection system that are able to supply a load with required power. A power system interconnection system comprises a storage battery an AC-DC power conversion device for the storage battery a charge and discharge station for an electric-powered automobile and an interconnection control device that are installed on a parking lot. The interconnection control device supplies a first load with power from at least one of the charge and discharge station and the AC-DC. power conversion device in a case where the electric power system is in an emergency situation.

Abstract: A measurement device that performs a predetermined measurement task together with a plurality of other measurement devices is provided. This measurement device is provided with a sampling phase generator for generating a sampling phase for instructing a timing of sampling, and a communication unit for communicating with at least one of the plurality of other measurement devices. The communication unit transmits the sampling phase generated by the sampling phase generator to at least one of the plurality of other measurement devices. The sampling phase generator is configured to generate a third sampling phase, using an operation that is based on a generated first sampling phase and a second sampling phase received by the communication unit from at least one of the plurality of other measurement devices.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: A power system includes a plurality of power conditioners, and a central management device that manages the plurality of power conditioners. The central management device includes a detector and an index calculator. The detector detects regulation subject power. The index calculator calculates an index for controlling individual output powers of the plurality of power conditioners such that the regulation subject power matches with target power. Each of the plurality of power conditioners includes a target power calculator and a controller. The target power calculator calculates the individual target power of the power conditioner based on an optimization problem using the index. The controller regulates the individual output power to the individual target power.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: A power system is provided for controlling a connection point power at a connection point with a power grid D. The power system includes a processing device that calculates a guidance command value for controlling the connection point power to achieve a target power, and a plurality of power control devices that each control the output power of mutually different types of control targets, based on a common guidance command value inputted from the processing device. Each of the plurality of power control devices calculates a target value of the output power, based on an optimization problem including a common evaluation function. The evaluation function includes the guidance command value and a design parameter for which a setting value set for each of the plurality of power control devices is substituted.

Abstract: A power system includes a plurality of power conditioners, and a central management device that manages the plurality of power conditioners. The central management device includes a detector and an index calculator. The detector detects regulation subject power. The index calculator calculates an index for controlling individual output powers of the plurality of power conditioners such that the regulation subject power matches with target power. Each of the plurality of power conditioners includes a target power calculator and a controller. The target power calculator calculates the individual target power of the power conditioner based on an optimization problem using the index. The controller regulates the individual output power to the individual target power.

Abstract: A measurement apparatus is used in cooperation with another equivalent measurement apparatus. Each measurement apparatus includes a change amount calculator for calculating a change amount of measured values, an average value generator for generating a first internal average value based on the change amount, and a communication unit for receiving a second internal average value that was generated by at least one other measurement apparatus. The average value generator generates a third internal average value, using a computation result based on at least the first and second internal average values.

Abstract: A control circuit reduces switching loss by periodically stopping switching elements, and reduces the difference between the time for which positive switching elements are in on state and the time for which negative switching elements are in on state. The control circuit includes a command value signal generator generating command value signals Xu1, Xv1, and Xw1 from line voltage command value signals Xuv, Xvw, and Xwu, and includes a PWM signal generator generating PWM signals by the command value signals Xu1, Xv1, and Xw1. The command value signals Xu1, Xv1, and Xw1 are continuously at “0” for a predetermined period, and are continuously at “2” for another period. This enables reducing the difference between the period for which the PWM signals are low and the period for which they are high.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.