The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 2020
Filed:
Oct. 25, 2016
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is provided a voltage/reactive power control device, method, and a voltage/reactive power control system that allow a proper control even with a control delay or in a situation where the system conditions at the time of setting the voltage reference value may not be always reproduced. A voltage/reactive power control system is applied to a power system in which a monitoring point is set in a local system divided as appropriate from the power system and the local system includes a voltage/reactive power control device capable of adjusting voltage and reactive power at the monitoring point. The voltage/reactive power control system includes: a central control unit that sets a control target value of the voltage and reactive power at the monitoring point in the local system based on optimal power flow calculation using total system data on the power system, generates a correction function to correct the control target value in accordance with a change in state of the power system relating to the monitoring point by using past history information on the states of the power system, and outputs the control target value and at least one or more correction functions; a local control apparatus that, when the control target value is different from system data on the local system, uses the correction function to calculate a controlled variable for the voltage/reactive power control device necessary to attain the control target value; and a device control apparatus that controls the voltage/reactive power control device in accordance with the controlled variable from the local control apparatus.