Emergency control method and system based on source-load-storage regulation and cutback

Patent metadata

Field	Value
Publication number	US-12051909-B2
Application number	US-202117997367-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Apr 26, 2021
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

Disclosed are an emergency control method and system based on source-load-storage regulation and cutback. According to the method, output power of power generating sources is regulated according to a power regulating quantity and a frequency regulation requirement, an output power compensation and output frequency of each power generating source are maintained within permissible ranges, so that a balance between power supply and demand of a power distribution network is maintained; and standby energy-storage power stations are used to make up a power gap, and an external power supply system is used to assist in making up a power deficiency, so that large load disturbance can be handled make up the power gap.

First claim

What is claimed is:

1. An emergency control method based on source-load-storage regulation and cutback, comprising:
step 1, obtaining a power regulating quantity ΔP regulating quantity ,
step 2, determining a frequency regulation demand; wherein the frequency regulation demand comprises: a first frequency regulation demand indicating an increase of a grid frequency and a second frequency regulation demand indicating a decrease of the grid frequency; in response to the first frequency regulation demand, performing step 3, and an output power compensation and variation being both greater than zero; in response to the second frequency regulation demand, performing step 9, and the output power compensation and variation being both less than zero;
step 3, obtaining five working states of power generating sources in a power distribution network; wherein the five working states of the power generating sources in the power distribution network comprise:
a total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and output power and output frequency of each power generating source being less than rated values of a power source;
the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power of part of the power generating sources being greater than the rated value of the power source;
the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity , using standby energy-storage power stations to compensate a power deficiency of the power distribution network;
the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity and the balance between power supply and demand of the power distribution network being still not maintained after the standby energy-storage power stations being used to compensate the power deficiency; and
the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity and the power deficiency of the power distribution network being still not made up by using the standby energy-storage power stations and cutting back removable loads, performing Step 8;
step 4, making, in response to the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power and the output frequency of each power generating source being less than the rated values of the power source, a total output power compensation of the power generating sources participating in output power compensation meet ΔP=ΔP regulating quantity according to the balance between supply and demand, calculating an output power compensation of each power generating source;
step 5, limiting, in response to the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power of part of the power generating sources being greater than the rated value of the power source, the output power of the power generating sources with the output power being greater than the rated value of the power source, and compensating a remaining power deficiency with the standby energy-storage power stations, making a total output power compensation of the power generating sources participating in power output, excluding the power generating sources with output power being greater than the rated value of the power source, meet ΔP=ΔP regulating quantity −ΔP out-of-limit power station according to the balance between supply and demand, calculating the output power compensation of each power generating source, and ending the process;
step 6, making, in response to the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity and use standby energy-storage power stations to compensate a power deficiency of the power distribution network, a total output power compensation of the power generating sources participating in power output and the standby energy-storage power stations meet ΔP=ΔP regulating quantity according to the balance between supply and demand, calculating the output power compensation of each power generating source;
step 7, cutting back, in response to the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity and the balance between power supply and demand of the power distribution network being still not maintained after the standby energy-storage power stations being used to compensate the power deficiency, removable loads based on a preset cutback principle, making a total output power compensation of the power generating sources and the standby energy-storage power stations after load cutback meet ΔP=ΔP regulating quantity −ΔP removable load f according to the balance between supply and demand, returning to step 3, repeating this cycle h times, then calculating a total output power compensation ΔP=ΔP regulating quantity −Σ f=1 h ΔP removable load f of the power generating sources participating in power output and the standby energy-storage power stations after load cutback according to the balance between supply and demand;
step 8, using, in response to the total output power compensation of the power generating sources in the power distribution network being less than the power regulating quantity ΔP regulating quantity and the power deficiency of the power distribution network being still not made up by using the standby energy-storage power stations and cutting back removable loads, an external power supply system to assist in making up the deficiency, making a total output power compensation of the power generating sources participating in power output, the standby energy-storage power stations and the external power supply system after load cutback meet ΔP=ΔP regulating quantity −Σ d=1 l ΔP removable load a according to the balance between supply and demand, calculating the output power compensation of each power generating source;
step 9, obtaining two working states of the power generating sources in the power distribution network; wherein the two working states comprise:
the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power and output frequency of each power generating source being less than the rated values of the power source; and
the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power of part of the power generating sources being greater than the rated value of the power source;
step 10, making, in response to the total output power compensation of the power generating sources in the power distribution network being greater than the power regulating quantity ΔP regulating quantity and the output power and output frequency of each power generating source being less than the rated values of the power source, a total output power compensation of the power generating sources meet ΔP=ΔP regulating quantity according to the balance between supply and demand, calculating the output power compensation of each power generating source; a

Assignees

• Univ Nanjing Posts & Telecommunications
• State Grid Electric Power Res Inst
• Nanjing Univ Of Poasts And Telecommunications

Inventors

• Yue Dong
• Dou Chunxia
• Zhang Zhijun
• Yue Wenbin
• Ding Xiaohua
• Luo Jianbo
• Li Yanman
• Huang Kun
• Han Tao

Classifications

• H02J2101/40

  Hybrid power plants, i.e. a plurality of different generation technologies being operated at one power plant · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J3/00142 Primary

  Oscillations concerning frequency · CPC title

• H02J3/28 Primary

  Arrangements for balancing of the load in networks by storage of energy · CPC title