System stabilization control device and power system control system

Patent metadata

Field	Value
Publication number	US-10461538-B2
Application number	US-201615555571-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 30, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A system stabilization control device controls a control instrument within a power system on the basis of measurement information from a plurality of measurement points within the power system. The system stabilization control device includes an equipment information database storing information of system equipment interconnected with the power system; a control priority determining unit determining the control priority of the control instrument on the basis of the information of the system equipment; a control target determining unit determining a control target on the basis of the measurement information from the plurality of measurement points and the control priority; a destabilization time calculating unit calculating destabilization time of the power system from the measurement information from the plurality of measurement points; and a control time determining unit determining control time of the control instrument on the basis of the destabilization time and the information of the system equipment.

First claim

The invention claimed is:

1. A system stabilization control device for controlling a control instrument installed within a power system based on measurement information from a plurality of measurement points within the power system, comprising:
an equipment information database for storing information of system equipment that is interconnected with the power system;
a control priority determining unit for determining a control priority of the control instrument based on information of the system equipment;
a control target determining unit for determining a control target based on the measurement information from the plurality of measurement points and the control priority, wherein the control target determining unit determines the control target by using an electrical distance or impedance between the measurement points in which unstable oscillation was observed and the control instrument interconnected points;
a destabilization time calculating unit for calculating destabilization time of the power system from the measurement information from the plurality of measurement points; and
a control time determining unit for determining control time of the control instrument based on the destabilization time and the information of the system equipment, and
wherein the system stabilization control device controls the determined control instrument for the determined control time.

2. The system stabilization control device according to claim 1 ,
wherein the destabilization time calculating unit calculates the destabilization time by using at least one among oscillation frequency, attenuation coefficient and amplitude of a frequency component of oscillation of the power system.

3. The system stabilization control device according to claim 2 ,
wherein the information of the system equipment includes at least one among control means, controllable variable and operating time of the system equipment including the control instrument.

4. The system stabilization control device according to claim 3 ,
wherein the information of the system equipment includes at least one among latitude and longitude of each of the plurality of measurement points, topology between the plurality of measurement points, impedance between the plurality of measurement points, and characteristics of electric power equipment that is interconnected near each of the plurality of measurement points.

5. The system stabilization control device according to claim 4 ,
wherein the equipment information database stores past oscillation information, and
wherein the oscillation detection unit selects the past oscillation information corresponding to a status of the measurement point group, and calculates an oscillation influence based on a duration of the frequency component in the selected past oscillation information.

6. A system stabilization control device for controlling a control instrument installed within a power system based on measurement information from a plurality of measurement points within the power system, comprising:
an equipment information database for storing equipment information of system equipment including the control instrument that is interconnected with the power system;
a control priority determining unit for determining the control priority of the control instrument based on the equipment information;
a control target determining unit for determining the control instrument to be controlled according to a distance between oscillation measurement points of power system oscillation detected from the measurement information and the control instrument, and the priority;
a destabilization time calculating unit for calculating destabilization time of the power system oscillation detected from the measurement information; and
a control time determining unit for determining control time based on the destabilization time and the equipment information,
wherein the system stabilization control device controls the determined control instrument for the determined control time.

7. A power system control system for obtaining, in a system stabilization control device, measurement information from a plurality of measurement points within a power system via first communication means, and giving control instructions to a control instrument within system equipment configuring the power system from the system stabilization control device via second communication means,
wherein the system stabilization control device comprises:
an equipment information database for storing information of system equipment that is interconnected with the power system;
a control priority determining unit for determining a control priority of the control instrument based on information of the system equipment;
a control target determining unit for determining a control target based on measurement information from a plurality of measurement points and the control priority;
a destabilization time calculating unit for calculating destabilization time of the power system from the measurement information from the plurality of measurement points;
a control time determining unit for determining control time based on the destabilization time and the equipment information;
an output unit for giving the control instructions including the determined control instrument and the determined control time via the second communication means;
an anticipated oscillation calculating unit for calculating anticipated oscillation based on the equipment information; and
an oscillation comparison unit for comparing the measurement information and the anticipated oscillation, and

wherein the control target determining unit determines the control target based on the oscillation comparison result and the control priority.

8. The power system control system according to claim 7 , further comprising:
an entire system stabilization control device connected to the output unit of the system stabilization control device and for obtaining information including the determined control instrument and the determined control time,
wherein the entire system stabilization control device comprises:
an additional control determining unit for determining an additional control instrument and an additional control time based on a received control instrument and control time; and
an output unit for sending the additional control instrument and the additional control time to the control instrument within the system equipment.

Assignees

• Hitachi Ltd

Inventors

• Yamazaki Jun
• Tomobe Osamu
• Kuroda Eisuke
• Tsubota Akira
• Tobe Sumito
• Yatsu Masahiro

Classifications

• H02J3/38

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• H02J3/381

  Dispersed generators · CPC title

• Y04S10/12

  Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation · CPC title

• Y04S10/123

  the energy generation units being or involving renewable energy sources · CPC title

• H02J2101/24

  Photovoltaics · CPC title