| 摘要 |
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 a voltage upper-and-lower-limit-value determination unit. |
| 主权项 |
1. A voltage monitoring control device that is connected, via a communication network, to a first local voltage control device, which is connected to a transformer-type voltage control apparatus that is connected to a power distribution line in a high-voltage system and controls a voltage on the power distribution line and which adjusts an amount of control of the voltage control apparatus every second cycle, which is shorter than a first cycle, such that a voltage value controlled by the voltage control apparatus is maintained within a range between a voltage upper-limit value and a voltage lower-limit value that are updated every first cycle, and a second local voltage control device, which is connected to a reactive-power-modified voltage control apparatus that controls a voltage on the power distribution line and which adjusts an amount of control of the voltage control apparatus every third cycle, which is shorter than the first cycle, the voltage monitoring control device comprising:
a load and power-generation-amount estimation unit to estimate, every first cycle, a load and power-generation-amount distribution representing a difference between a pure load and a power-generation amount at each point of a power distribution system under each of a condition of a mean load amount and a mean power-generation amount, a condition of a minimum load amount and a maximum power-generation amount, and a condition of a maximum load amount and a minimum power-generation amount; a voltage-fluctuation-band estimation unit to estimate a voltage fluctuation band of the voltage within the first cycle on a basis of the load and power-generation-amount distribution; a control-target-voltage determination unit to determine a first threshold value for an allowance for an upper limit of an appropriate voltage range and a second threshold value for an allowance for a lower limit of an appropriate voltage range on a basis of the voltage fluctuation band estimated by the voltage-fluctuation-band estimation unit, and to determine a control target value to be indicated to the first local voltage control device on a basis of a difference between the first threshold value and the allowance for the upper limit and on a basis of a difference between the second threshold value and the allowance for the lower limit; a voltage upper-and-lower-limit-value determination unit to determine the voltage upper-limit value and the voltage lower-limit value on a basis of the control target value; and a transceiver unit to transmit the voltage upper-limit value and the voltage lower-limit value to the first local voltage control device via the communication network. |
