Abstract: A command device according to the present disclosure includes a first communication unit that receives a first command value representing an externally-commanded charge-discharge amount with respect to a storage battery connected to a power system, a low-pass filter and a high-pass filter for extracting a short-period component of a measurement value with respect to electrical power at an interconnection point of a PCS that controls charging and discharging of the storage battery, and an amount-of-control calculation unit that calculates a third command value by addition of a first command value and a second command value generated based on the short-period component, and commands the PCS to use the third command value.

Abstract: A voltage management device according to the present disclosure includes a communication unit that obtains, for each of sections in a power system, a measurement value of a voltage measured by a smart meter connected to that section, where the sections are generated by segmentation between monitoring points, and a voltage estimation unit that estimates, for each of the sections, a voltage drop quantity and a voltage rise quantity in that section using the measurement value.

Abstract: A charge/discharge plan creation device according to the present disclosure includes: a constraint condition determination unit that determines a constraint condition related to an amount of control of charge/discharge of a plurality of storage batteries connected to a power grid for securing quality of the power grid by using a prediction value of an amount of charge/discharge of the plurality of storage batteries computed based on an actual value of charge/discharge of the plurality of storage batteries; and a plan value computation unit that computes a plan value of an amount of control for the plurality of storage batteries by using the constraint condition and a variation of a remaining power of at least a part of the plurality of storage batteries generated by controlling charge/discharge of at least a part of the plurality of storage batteries for securing the quality of the power grid.

Abstract: A facility plan evaluation device includes a proposed plan receiving unit receiving input of a facility plan including capacities and locations of charging and discharging facilities to be newly arranged in a power system, a prediction unit predicting charge and discharge amounts of the charging and discharging facilities, and demands and power generation amounts of existing facilities, which are facilities already connected in the power system, a power flow calculating unit estimating voltage and current in the power system based on a prediction result of the prediction unit, a determination unit determining whether at least one of deviation of voltage from a proper range and overcurrent occurs based on an estimation result of the power flow calculating unit, and determining whether the facility plan needs to be modified based on a determination result, and a result presenting unit presenting a determination result of the determination unit.

Abstract: A centralized voltage control apparatus is connected via a communication network to a plurality of local voltage control devices each controlling a corresponding voltage controller connected to a distribution line of a distribution system. The centralized voltage control apparatus includes: a voltage distribution determination unit that calculates a control variable for each of the voltage controllers on the basis of a measured value of voltage at each measurement point of the distribution line and a proper voltage range at each measurement point; and a tap position determination unit that gives a command value to each of the local voltage control devices on the basis of the control variable. At least a part of the proper voltage range at each measurement point is determined on the basis of an estimated value of a change in voltage in a section in which voltage is not measured on the distribution line.

Abstract: A system state estimation device according to the present invention includes: a classification unit that classifies first meter data into a plurality of groups, the first meter data being meter data metered in a first time zone by at least some of a plurality of smart meters; a statistic calculation unit that calculates variation of the first meter data for each of the groups; used data determination unit that determines, for each of the groups, whether to use meter data in a second time zone or a substitute value in estimation computation for estimating a system state in the second time zone on the basis of the variation; and an aggregation unit and a power flow calculation unit that perform the estimation computation on the basis of a result of determination performed by the used data determination unit.

Abstract: A centralized voltage controller connected, via a communication network, to local voltage control units controlling voltage controllers, which are connected to a distribution line of a distribution system and control voltage of the distribution line, has: a voltage distribution determination unit calculating a controlled amount for each first voltage controller to be controlled among the plurality of voltage controllers, based on a measured value of voltage at each point of the distribution line; a tap position determination unit generating a command value to be given to each local voltage control unit based on the controlled amount; and a control state determination unit determining whether each voltage controller is a second voltage controller that fails to perform control according to the command value, and setting the voltage controllers except the second voltage controller to be the first voltage controller.

Abstract: A power-distribution-system management apparatus according to the present invention includes a communication unit that acquires an amount of insolation, which is a measurement value measured by a pyranometer, via a communication network, which is used to collect a measurement value of a smart meter that measures electric energy, and a meter-data management apparatus and a power-generation-amount estimating unit that estimates, on the basis of the amount of insolation, a power generation amount of each of two or more solar power generation facilities connected to a power distribution line of a high voltage system.

Abstract: A centralized voltage controller according to the present invention includes a voltage distribution determination unit that calculates a controlled amount in each of a plurality of voltage controllers on the basis of a measured value of a voltage at each point on a distribution line, a tap position determination unit that determines a change amount of a tap position to be given to each of a plurality of local voltage control units on the basis of the controlled amount, and a tap-change-amount management unit that limits the change amount when receiving, from the local voltage control unit, a limit signal indicating that a tap position in the voltage controller controlled by the local voltage control unit is an upper limit or a lower limit of a settable range.

Abstract: A distribution grid management apparatus that is a power generation amount estimation apparatus includes a communication unit to acquire a solar radiation amount that is a measurement value measured by a solar radiation meter at an interval shorter than a data collection interval that is an interval at which a measurement value from a smart meter that measures the amount of electric power is collected; and a power generation amount calculation unit to estimate, on the basis of the solar radiation amount, the power generation amount of each of a plurality of photovoltaic facilities connected to a distribution line of a high-voltage grid.

Abstract: A centralized voltage control apparatus is connected via a communication network to a plurality of local voltage control devices each controlling a corresponding voltage controller connected to a distribution line of a distribution system. The centralized voltage control apparatus includes: a voltage distribution determination unit that calculates a control variable for each of the voltage controllers on the basis of a measured value of voltage at each measurement point of the distribution line and a proper voltage range at each measurement point; and a tap position determination unit that gives a command value to each of the local voltage control devices on the basis of the control variable. At least a part of the proper voltage range at each measurement point is determined on the basis of an estimated value of a change in voltage in a section in which voltage is not measured on the distribution line.

Abstract: The power distribution system management device according to the present invention includes a communication unit that receives measurement values from a plurality of high-voltage sensors that each measure a voltage and a power flow of a power distribution line in a high-voltage system, and receives, from a plurality of smart meters that each measure an amount of power, information on the amount of power; and a voltage control unit that sections the power distribution line between two high-voltage sensors among the plurality of high-voltage sensors into a plurality of sections to estimate a voltage distribution along the power distribution line based on two of the measurement values received from the two high-voltage sensors and on the amount of power of each of the sections.

Abstract: A system state estimation device according to the present invention includes: a classification unit that classifies first meter data into a plurality of groups, the first meter data being meter data metered in a first time zone by at least some of a plurality of smart meters; a statistic calculation unit that calculates variation of the first meter data for each of the groups; used data determination unit that determines, for each of the groups, whether to use meter data in a second time zone or a substitute value in estimation computation for estimating a system state in the second time zone on the basis of the variation; and an aggregation unit and a power flow calculation unit that perform the estimation computation on the basis of a result of determination performed by the used data determination unit.

Abstract: A power-generation-amount estimation apparatus estimating photovoltaic power generation amount carried along a power distribution line in a high-voltage system to which loads and photovoltaic power generation equipments are connected, includes: a communication unit receiving voltage and active power at the end point on the upstream side of a power distribution line and voltage and active power at the end point on the downstream side; a load/power-generation center calculator calculating impedance at a load center point based on contract information and the connection position of each load and calculating impedance at a power generation center point based on the connection position and the power generation capacity of each photovoltaic power generation equipment; and a load/power-generation-amount calculator estimating the photovoltaic power generation amount based on the impedance at the load center point, the impedance at the power generation center point, and the voltages and active powers received by the c

Abstract: A supply-demand control device connected through a communication network to a charge-discharge control device to control charge and discharge of a power storage device connected to a power distribution line in a power distribution system managed by a community, the supply-demand control device including a load and power-generation-amount estimation unit to estimate a load and a power generation amount as a planned load and power generation amount; a first-evaluation-function calculation unit to calculate a value of a first evaluation function, which is a sum of a power purchase cost, a natural-discharge loss cost, a storage-battery life-span cost, a power-transmission loss cost, and a charge-discharge loss cost; a planned charge-discharge command calculation unit to calculate the charge-discharge command amount by which the first evaluation function is minimized; and a power-purchase plan output unit to create a power purchase plan based on the charge-discharge command.

Abstract: A centralized voltage controller according to the present invention includes a voltage distribution determination unit that calculates a controlled amount in each of a plurality of voltage controllers on the basis of a measured value of a voltage at each point on a distribution line, a tap position determination unit that determines a change amount of a tap position to be given to each of a plurality of local voltage control units on the basis of the controlled amount, and a tap-change-amount management unit that limits the change amount when receiving, from the local voltage control unit, a limit signal indicating that a tap position in the voltage controller controlled by the local voltage control unit is an upper limit or a lower limit of a settable range.

Abstract: A centralized voltage controller connected, via a communication network, to local voltage control units controlling voltage controllers, which are connected to a distribution line of a distribution system and control voltage of the distribution line, has: a voltage distribution determination unit calculating a controlled amount for each first voltage controller to be controlled among the plurality of voltage controllers, based on a measured value of voltage at each point of the distribution line; a tap position determination unit generating a command value to be given to each local voltage control unit based on the controlled amount; and a control state determination unit determining whether each voltage controller is a second voltage controller that fails to perform control according to the command value, and setting the voltage controllers except the second voltage controller to be the first voltage controller.

Abstract: A distribution grid management apparatus that is a power generation amount estimation apparatus includes a communication unit to acquire a solar radiation amount that is a measurement value measured by a solar radiation meter at an interval shorter than a data collection interval that is an interval at which a measurement value from a smart meter that measures the amount of electric power is collected; and a power generation amount calculation unit to estimate, on the basis of the solar radiation amount, the power generation amount of each of a plurality of photovoltaic facilities connected to a distribution line of a high-voltage grid.

Abstract: A centralized voltage control apparatus calculates an optimum voltage distribution in a centralized control cycle period and determines, based on the relationship between the optimum voltage distribution and a proper voltage range, voltage upper and lower limit values for which a command is issued to each local voltage control apparatus taking into account voltage upper and lower limit margin amounts at respective points in a voltage control responsible range of the local voltage control apparatus for each local voltage control apparatus. The local voltage control apparatus adjusts, based on the voltage upper and lower limit values commanded from the centralized voltage control apparatus via a communication network, a control amount of a voltage control device every local control cycle shorter than the centralized control cycle period, to maintain the control voltage of the voltage control device between the voltage upper and lower limit values.

Abstract: A voltage control device includes a fluctuation calculating unit that calculates voltage tolerance, which is a difference between a voltage measured by a voltage control apparatus and a proper voltage upper limit value or a proper voltage lower limit value, and voltage sensitivity, which is a ratio of a fluctuation amount of active power and a fluctuation amount of the voltage, a change-request-information generating unit that generates information for requesting a change of a limit value of a control target range of other voltage control devices, a change processing unit that performs a change of a limit value of a control target range of the voltage control device according to content of the change request information, and a communication processing unit that transmits the change request information to the voltage control devices other than the voltage control device. The change request information includes information indicating voltage tolerance and voltage sensitivity.