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: The central voltage control device includes a power-distribution estimating unit to estimate a power distribution in the power distribution line on the basis of first received measurement information, a voltage-distribution estimating unit to estimate a voltage distribution of the power distribution line on the basis of the power distribution, a tap-position determining unit to determine a tap position of the voltage controller when a voltage deviates from the proper voltage range in the voltage distribution, and a correcting unit to correct the power distribution in the power distribution line on the basis of the received deviation information. When the power distribution is corrected, the voltage-distribution estimating unit estimates the voltage distribution using the corrected power distribution.

Abstract: A voltage controller includes: a voltage adjusting unit that controls a voltage controller that changes a voltage of a bus, to which a plurality of power distribution lines are connected, such that the voltage of the bus is within a target voltage range; a communication processing unit that communicates with a voltage controller that controls a voltage control device connected to the power distribution line or a voltage monitoring device that is installed on the power distribution line to measure the voltage at an installation site; a target-voltage-range change request processing unit that transmits a change-possibility confirmation for inquiring about whether the target voltage range can be changed to the voltage monitoring device connected to another power distribution line, via the communication processing unit, and determines whether to change the target voltage range according to a response to the change-possibility confirmation.

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: The transformer-type voltage controller calculates a total reactive-power integration value, a total positive-maximum reactive-power integration value, and a total negative-maximum reactive-power integration value by using reactive power generation data that includes those integration values and received from a reactive-power-control-type voltage controller, calculates a positive reactive-power margin according to the total positive-maximum reactive-power integration value and the total reactive-power integration value, and calculates a negative reactive-power margin according to the negative-maximum reactive-power integration value total and the reactive-power integration value total, and changes a tap position of a transformer-type voltage control device such that if the positive reactive-power margin is smaller than a positive-side threshold, the positive reactive-power margin becomes larger than the positive-side threshold, and changes the tap position such that if the negative reactive-power margin is sm

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.

Abstract: A voltage monitoring control system includes voltage control apparatuses controlling voltage on a power distribution line, a local voltage control device adjusting a voltage value controlled by the voltage control apparatuses such that it is maintained within a range between voltage upper-and-lower-limit values updated every first cycle, a voltage and power-flow measurement device calculating and transmitting fluctuation-band information indicating fluctuation band of the voltage every third cycle longer than a second cycle based on voltage on the power distribution line measured every second cycle shorter than the first cycle, and a centralized voltage control device.

Abstract: A voltage monitoring control device includes: a transceiver unit communicating with local voltage control devices adjusting a control amount of voltage control apparatuses that control a voltage on a power distribution line in a high-voltage system every second cycle based on a command value updated every first cycle; an indicatable-range updating unit determining an indicatable range, which is a range of reactive power indicatable to the local voltage control device, based on a control result received via the transceiver unit from the local voltage control device that controls a reactive-power-modified voltage control apparatus, the control result being a limit-value time or a limit-value-time ratio; and a reactive-power determination unit determining a reactive-power command value, which is a command value updated every first cycle based on the indicatable range and transmitted, via the transceiver unit, to the local voltage control device that controls the reactive-power-modified voltage control apparatus.

Abstract: The central voltage control device includes a power-distribution estimating unit to estimate a power distribution in the power distribution line on the basis of first received measurement information, a voltage-distribution estimating unit to estimate a voltage distribution of the power distribution line on the basis of the power distribution, a tap-position determining unit to determine a tap position of the voltage controller when a voltage deviates from the proper voltage range in the voltage distribution, and a correcting unit to correct the power distribution in the power distribution line on the basis of the received deviation information. When the power distribution is corrected, the voltage-distribution estimating unit estimates the voltage distribution using the corrected power distribution.

Abstract: A centralized voltage control device connected, via a communication network, to local voltage control devices connected to voltage control apparatuses, including: a transmission and reception unit receiving the number of times a tap position is changed per fixed time of the voltage control apparatus from the local voltage control device; a dead-zone-width updating unit increasing a dead zone width when the number of times a tap position is changed in a voltage control apparatus of a transformer type is a threshold or larger; and a voltage-upper-and-lower-limit-value determining unit determining the voltage upper limit value and the voltage lower limit value for each local voltage control device and issuing a command regarding these values to each local voltage control device, and determining the voltage upper limit value and the voltage lower limit value of the voltage control apparatus of a transformer type on the basis of the dead zone width.

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 control device connected to a first local voltage control device adjusting the control amount every second cycle such that a voltage of a transformer-type voltage control apparatus is maintained within a range between voltage upper and lower limit values updated every first cycle and a second local voltage control device adjusting the control amount of a reactive-power-modified voltage control apparatus every third cycle, wherein the centralized voltage control device includes a load and power-generation-amount estimation unit estimating a load and power-generation-amount distribution every first cycle under condition of a mean load and mean power generation, condition of a minimum load and maximum power generation, and condition of a maximum load and minimum power generation, a voltage-fluctuation-band estimation unit estimating a voltage fluctuation band, an optimal-voltage-distribution determination unit determining a control target value of the first local voltage control device, and

Abstract: A cooperative voltage sensor (CVS) issues a target voltage change request when a voltage moving average at an end thereof deviates from a proper voltage upper or lower limit value. A cooperative voltage controller (CVC) also can issue a target voltage change request when a voltage moving average at an end thereof deviates from the proper voltage upper or lower limit value. The target voltage change request issued by the cooperative voltage sensor (CVS) or the cooperative voltage controller (CVC) is transferred between cooperative voltage controllers (CVCs) via a communication network and notified to all the cooperative voltage controllers (CVCs), and a cooperative operation of voltage control is realized.

Abstract: A voltage controller includes: a voltage adjusting unit that controls a voltage controller that changes a voltage of a bus, to which a plurality of power distribution lines are connected, such that the voltage of the bus is within a target voltage range; a communication processing unit that communicates with a voltage controller that controls a voltage control device connected to the power distribution line or a voltage monitoring device that is installed on the power distribution line to measure the voltage at an installation site; a target-voltage-range change request processing unit that transmits a change-possibility confirmation for inquiring about whether the target voltage range can be changed to the voltage monitoring device connected to another power distribution line, via the communication processing unit, and determines whether to change the target voltage range according to a response to the change-possibility confirmation.

Abstract: A voltage monitoring control system includes voltage control apparatuses controlling voltage on a power distribution line, a local voltage control device adjusting a voltage value controlled by the voltage control apparatuses such that it is maintained within a range between voltage upper-and-lower-limit values updated every first cycle, a voltage and power-flow measurement device calculating and transmitting fluctuation-band information indicating fluctuation band of the voltage every third cycle longer than a second cycle based on voltage on the power distribution line measured every second cycle shorter than the first cycle, and a centralized voltage control device.

Abstract: The transformer-type voltage controller calculates a total reactive-power integration value, a total positive-maximum reactive-power integration value, and a total negative-maximum reactive-power integration value by using reactive power generation data that includes those integration values and received from a reactive-power-control-type voltage controller, calculates a positive reactive-power margin according to the total positive-maximum reactive-power integration value and the total reactive-power integration value, and calculates a negative reactive-power margin according to the negative-maximum reactive-power integration value total and the reactive-power integration value total, and changes a tap position of a transformer-type voltage control device such that if the positive reactive-power margin is smaller than a positive-side threshold, the positive reactive-power margin becomes larger than the positive-side threshold, and changes the tap position such that if the negative reactive-power margin is sm

Abstract: A centralized voltage control device connected to a first local voltage control device adjusting the control amount every second cycle such that a voltage of a transformer-type voltage control apparatus is maintained within a range between voltage upper and lower limit values updated every first cycle and a second local voltage control device adjusting the control amount of a reactive-power-modified voltage control apparatus every third cycle, wherein the centralized voltage control device includes a load and power-generation-amount estimation unit estimating a load and power-generation-amount distribution every first cycle under condition of a mean load and mean power generation, condition of a minimum load and maximum power generation, and condition of a maximum load and minimum power generation, a voltage-fluctuation-band estimation unit estimating a voltage fluctuation band, an optimal-voltage-distribution determination unit determining a control target value of the first local voltage control device, and

Abstract: A voltage monitoring control device includes: a transceiver unit communicating with local voltage control devices adjusting a control amount of voltage control apparatuses that control a voltage on a power distribution line in a high-voltage system every second cycle based on a command value updated every first cycle; an indicatable-range updating unit determining an indicatable range, which is a range of reactive power indicatable to the local voltage control device, based on a control result received via the transceiver unit from the local voltage control device that controls a reactive-power-modified voltage control apparatus, the control result being a limit-value time or a limit-value-time ratio; and a reactive-power determination unit determining a reactive-power command value, which is a command value updated every first cycle based on the indicatable range and transmitted, via the transceiver unit, to the local voltage control device that controls the reactive-power-modified voltage control apparatus.

Abstract: A demand-supply planning device includes: a power demand predicting unit that predicts power demand; an expected rebate value predicting unit that calculates an expected profit value per unit amount of reduced power based on an occurrence probability of a demand response and a rebate value to be acquired through the demand response; and an optimal operation plan creating unit that sets an addition result of a first cost for power purchase, a second cost for power generation in power generators and storage batteries, and a multiplication result of the expected profit value and reserve power, which is an amount of power capable of being further generated by the power generators and the storage batteries after an amount of power supplied satisfying the power demand is generated, as an evaluation function and determines an operation plan of the reserve power and the power generators and the storage batteries.