Power system voltage reactive power monitoring control device and method

Patent metadata

Field	Value
Publication number	US-10673235-B2
Application number	US-201615568238-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Apr 22, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

In a power system voltage reactive power monitoring control device, a balance between the power system voltage and the reactive power can be maintained even when, for example, the output of renewable energy varies over time due to the weather, or the power supply configuration or system configuration changes, and the economic efficiency can be improved. In the power system voltage reactive power monitoring control device, which supplies transmission data to individual devices capable of adjusting the voltage and the reactive power of a power system, indices indicating the stability of the power system are used to determine one or more target value restrictions, information about the target value is obtained from the target value restrictions, transmission data containing information about the target value is supplied to the individual devices, and the voltage and reactive power at the relevant installation site are adjusted by the individual devices.

First claim

The invention claimed is:

1. A power system voltage reactive power monitoring control device comprising:
a user interface;
a communication device that communicates with an individual device external to the power system voltage reactive power monitoring control device;
a memory that stores a program for execution in the power system voltage reactive power monitoring control device; and
a CPU programmed to execute the program stored in the memory to
obtain one or more target value constraints by using one or more indexes indicating stability in a voltage of a power system,
obtain information on a target value of the voltage of the power system from the one or more target value constraints, and
transmit transmission data to the individual device, which is capable of adjusting a voltage and a reactive power of the power system, including the information on the target value,

wherein the individual device adjusts the voltage and the reactive power at an installation location of the power system based on the transmission data received from the CPU to maintain a balance between the voltage and the reactive power at the installation location by varying the target value and a constraint value of the target value at each time of a target value changing timing;
wherein the information on the target value which is obtained from the one or more target value constraints is information including the target value changing timing and at least one of a target value width and a magnitude of the target value.

2. The power system voltage reactive power monitoring control device according to claim 1 ,
wherein the one or more indexes indicating stability of the power system include at least one of steady-state stability, voltage stability, and a control margin of the power system.

3. The power system voltage reactive power monitoring control device according to claim 1 ,
wherein the individual device obtains data of the power system at the installation location, and adjusts the voltage and the reactive power at the installation location, with the information on the target value transmitted from the voltage reactive power monitoring control device as a target value.

4. The power system voltage reactive power monitoring control device according to claim 1 ,
wherein the information on the target value obtained from the one or more target value constraints is information on an amount of control for achieving the target value.

5. The power system voltage reactive power monitoring control device according to claim 4 ,
wherein the individual device performs position control, and performs operation to a position indicated by the amount of control to adjust the voltage and the reactive power at the installation location.

6. The power system voltage reactive power monitoring control device according to claim 1 , wherein the CPU is further programmed to:
exclude a fluctuation component during occurrence of a failure from fluctuation components of the power system,
extract a supply and demand fluctuation due to renewable energy resources as fluctuation data, and
obtain the one or more target value constraints by adding the fluctuation data and using the one or more indexes indicating stability of the power system.

7. The power system voltage reactive power monitoring control device according to claim 1 , wherein the CPU is further programmed to:
obtain a deviation due to a change in a power flow state of the power system, and
obtain the one or more target value constraints by adding the deviation and using the one or more indexes indicating stability of the power system.

8. The power system voltage reactive power monitoring control device according to claim 1 , wherein the CPU is further programmed to:
determine an urgency state of the power system,
obtain the information on the target value in the urgency state, and
transmit the information on the target value in the urgency state to the individual device,
wherein the individual device adjusts the voltage and the reactive power at the installation location based on the information on the target value in the urgency state.

9. A power system voltage reactive power monitoring control method comprising:
obtaining, by a CPU, one or more target value constraints by using one or more indexes indicating stability in a voltage of the power system;
obtaining, by the CPU, information on a target value of the voltage of the power system from the one or more target value constraints;
transmitting, by a communication device, transmission data including the information on the target value to an individual device capable of adjusting the voltage and a reactive power of the power system; and
adjusting, by the individual device, the voltage and the reactive power at an installation location of the power system based on the transmission data received from the CPU to maintain a balance between the voltage and the reactive power at the installation location by varying the target value and a constraint value of the target value at each time of a target value changing timing;
wherein the information on the target value which is obtained from the one or more target value constraints is information including the target value changing timing and at least one of a target value width and a magnitude of the target value.

Assignees

• Hitachi Ltd

Inventors

• Kuroda Eisuke
• Kato Daichi
• Tomobe Osamu
• Miyoshi Haruki
• Ueno Shintaro

Classifications

• Y04S10/24

  Cross-Sectional Technologies · mapped topic

• H02J13/00

  Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network · CPC title

• H02J13/0006

  Electricity · mapped topic

• Y02E40/74

  Cross-Sectional Technologies · mapped topic

• H02J3/16 Primary

  by adjustment of reactive power · CPC title