Patent ID: 9600003
Date: 2017-03-21
CPC Classifications: G05B,G05F,H02J,Y02E,Y04S

Claim:
1. A power-distribution-system voltage control system comprising: a plurality of voltage control apparatuses connected to a high-voltage power distribution line connected to a transformer for power distribution and a low-voltage power distribution line connected to the high-voltage power distribution line via a transformer, the voltage control apparatuses each controlling voltage; voltage controllers connected to the respective voltage control apparatuses, each of the voltage controllers acquiring, at every fixed cycle, a voltage measurement value at an end thereof measured by the corresponding voltage control apparatus and storing the voltage measurement value for a fixed period, adjusting a control amount of the corresponding voltage control apparatus so that the voltage measurement value is maintained within a range between a target voltage upper limit value and a target voltage lower limit value set in advance, being capable of generating and sending target voltage change request information for requesting the voltage controllers other than itself to change respective target voltage upper limit values and target voltage lower limit values when a latest voltage moving average calculated using a latest voltage measurement value and stored voltage measurement values deviates from a range between a proper voltage upper limit value and a proper voltage lower limit value, and changing the target voltage upper limit value and the target voltage lower limit value thereof according to content of target voltage change request information when the voltage controller receives the target voltage change request information from an outside thereof or itself generates the target voltage change request information; a plurality of voltage sensors connected to at least the high-voltage power distribution line, each of the voltage sensors measuring voltage at an end thereof at every fixed cycle and storing a voltage measurement value for a fixed period and generating and transmitting target voltage change request information for requesting the voltage controllers to change the respective target voltage upper limit values and the respective target voltage lower limit values when a latest voltage moving average calculated using a latest voltage measurement value and stored voltage measurement values deviates from a range between a proper voltage upper limit value and a proper voltage lower limit value set in advance; and a communication network connecting the voltage controllers and the voltage sensors to allow them to communicate with each other, wherein when the target voltage change request information is generated and sent in any of the voltage controllers and the voltage sensors, the target voltage change request information is transferred between the voltage controllers via the communication network to be spread over all the voltage controllers.