Power system monitoring apparatus, power system control apparatus, and power system monitoring method employing events of assumable breakdowns and assumable output changes

Patent metadata

Field	Value
Publication number	US-10193385-B2
Application number	US-201415116524-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Feb 28, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

In administration based on the existing (N−1) reliability criteria, an appropriate administration plan may be not drafted in a power system in which renewable energy increases. Accordingly, according to the invention, a power system monitoring apparatus that monitors a power system includes: an input unit that inputs assumable system breakdown data including an occurrence frequency of each assumable breakdown of the power system and assumable output change data including an occurrence frequency of each assumable output change of each generator connected to the power system; and an output unit that generates conditions by which events of the assumable breakdowns and the assumable output changes are combined based on the occurrence frequencies of the assumable breakdown and the assumable output change and outputs a control plan for each of the conditions.

First claim

The invention claimed is:

1. A power system monitoring apparatus that monitors a power system, the apparatus comprising a processor coupled to the power system and programmed to:
input assumable system breakdown data, which is data of assumable breakdown of the power system, including an occurrence frequency of each assumable breakdown of the power system and assumable output change data including an occurrence frequency of each assumable output change of each generator connected to the power system; and
generate conditions by which events of the assumable breakdowns and the assumable output changes are combined based on the occurrence frequencies of the assumable breakdown and the assumable output change and outputs a control plan to control said each generator for each of the conditions;
wherein an event of an assumable breakdown is an event of breakdown that is assumed to cause supply troubles in a main segment of the power system; and
wherein an event of an assumable output change is an event of output change of a power generation facility group which can affect a main current of the power system.

2. The power system monitoring apparatus according to claim 1 ,
wherein the processor is programmed to simulate whether an internal phase difference angle of said each generator and a voltage of a predetermined node in the power system converge within a predetermined range under the condition and change the control plan based on a result of the simulation.

3. The power system monitoring apparatus according to claim 1 ,
wherein the processor is programmed to display the control plan for each of the conditions by a correlation between the occurrence frequency and a control amount.

4. The power system monitoring apparatus according to claim 1 ,
wherein the assumable system breakdown data includes spot information of the assumable breakdown, the assumable output change data includes spot information of the assumable output change, and the conditions are generated based on the spot information.

5. The power system monitoring apparatus according to claim 4 ,
wherein the condition is weighted between the events of the assumable output change based on the spot information.

6. The power system monitoring apparatus according to claim 1 ,
wherein the conditions are generated by combinations of the events of the assumable breakdowns and the assumable output changes in which the occurrence frequencies are within a predetermined range.

7. The power system monitoring apparatus according to claim 1 ,
wherein the assumable system breakdown data includes data of a breakdown phase according to a breakdown occurrence spot.

8. The power system monitoring apparatus according to claim 1 ,
wherein the assumable output change data includes data of an output change phase of each generator.

9. The power system monitoring apparatus according to claim 8 ,
wherein the data of the output change phase includes an output change amount and an output change speed.

10. The power system monitoring apparatus according to claim 8 ,
wherein the data of the output change phase includes a cutout event of wind power generation.

11. The power system monitoring apparatus according to claim 1 ,
wherein the processor is programmed to input and use a preliminarily set control policy of each generator to generate the control plan.

12. The power system monitoring apparatus according to claim 1 , wherein a control instruction to said each generator based on the control plan output is performed to control said each generator.

13. A power system monitoring method of monitoring a power system, the method comprising:
inputting assumable system breakdown data, which is data of assumable breakdown of the power system, including an occurrence frequency of each assumable breakdown of the power system and assumable output change data including an occurrence frequency of each assumable output change of each generator connected to the power system; and
generating conditions by which events of the assumable breakdowns and the assumable output changes are combined based on the occurrence frequencies of the assumable breakdown and the assumable output change and outputting a control plan to control said each generator for each of the conditions;
wherein an event of an assumable breakdown is an event of breakdown that is assumed to cause supply troubles in a main segment of the power system; and
wherein an event of an assumable output change is an event of output change of a power generation facility group which can affect a main current of the power system.

14. The power system monitoring method according to claim 13 , further comprising:
simulating whether an internal phase difference angle of said each generator and a voltage of a predetermined node in the power system converge within a predetermined range under the condition and changing the control plan based on a result of the simulation.

15. The power system monitoring method according to claim 13 , further comprising:
displaying the control plan for each of the conditions by a correlation between the occurrence frequency and a control amount.

16. The power system monitoring method according to claim 13 ,
wherein the assumable system breakdown data includes spot information of the assumable breakdown, the assumable output change data includes spot information of the assumable output change, and the conditions are generated based on the spot information.

17. The power system monitoring method according to claim 16 , further comprising:
weighting the condition between the events of the assumable output change based on the spot information.

18. The power system monitoring method according to claim 13 ,
wherein the conditions are generated by combinations of the events of the assumable breakdowns and the assumable output changes in which the occurrence frequencies are within a predetermined range.

19. The power system monitoring method according to claim 13 ,
wherein the assumable output change data includes data of an output change phase of each generator; and
wherein the data of the output change phase includes an output change amount and an output change speed.

20. The power system monitoring method according to claim 13 , further comprising:
performing a control instruction to said each generator based on the control plan output.

Assignees

• Hitachi Ltd

Inventors

• Sato Yasuo
• Yatsu Masahiro
• Hara Kouichi
• Kuroda Eisuke
• Tomobe Osamu
• Yamazaki Jun

Classifications

• Y04S10/30

  State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge · CPC title

• G05B17/02

  electric · CPC title

• H02J13/12 Primary

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• Y02E60/74

  Cross-Sectional Technologies · mapped topic

• H02J13/0006

  Electricity · mapped topic