Source-grid-load-storage networked collaborative frequency control method

Patent metadata

Field	Value
Publication number	US-12074443-B2
Application number	US-202117997537-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Jun 1, 2021
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

A source-grid-load-storage networked collaborative frequency control method is disclosed, which comprises acquiring total active power ΔP to be regulated during a secondary frequency regulation process of a power grid; performing frequency regulation by source-grid-load-storage of the power distribution system, allocating power regulation capacities, and determining whether the desired total active power is met after the frequency regulation; if the desired total active power is met, determining whether power of power generation units is out of limit; if the power of the power generation units is not out of limit, keeping active power of the power distribution system in balance to complete frequency regulation of the power grid; if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference to keep the active power of the power distribution system in balance.

First claim

What is claimed is:

1. A source-grid-load-storage networked collaborative frequency control device, comprising:
a processor; and
a memory with a computer program stored therein, wherein the computer program, when executed by the processor, is configured to implement a source-grid-load-storage networked collaborative frequency control method, comprising:
acquiring a desired total active power ΔP to be regulated by a power distribution system during a secondary frequency regulation process of a power grid;
performing according to the desired total active power ΔP, frequency regulation on source-grid-load-storage of the power distribution system, allocating power regulation capacities, and determining whether the desired total active power ΔP is met after the frequency regulation;
if the desired total active power ΔP is met, determining whether power of power generation units is out of limit;
if the power of the power generation units is not out of limit, keeping active power of the power distribution system in balance to complete frequency regulation of the power grid;
if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference to keep the active power of the power distribution system in balance, so as to complete frequency regulation of the power grid; and
if the desired total active power ΔP is not met, coordinating the source-grid-load-storage and other resources in the power distribution system to keep the active power of the power distribution system in balance, so as to complete frequency regulation of the power grid;
wherein if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference, comprises:
adjusting the output power of a power generation unit with the power being out of limit to maximum, and correcting power allocated to the other power generation units in the source-grid-load-storage of the power distribution system according to inverse ratios of the difference adjustment coefficients of these power generation units to the difference adjustment coefficient of the out-of-limit power generation unit;
checking whether the power of the other power generation units is out of limit after correction, and correcting a power generation unit with the power being out of limit until all power generation units with the power being out of limit are corrected;
when the total active power regulation capacity of all the power generation units still does not meet the desired total active power ΔP to be regulated after correction, adjusting power allocated to the micro-grid groups;
when the total active power regulation capacity of all the power generation units still does not meet the desired total active power ΔP to be regulated after power is reallocated to the micro-grid groups, using the energy-storage power stations to compensate an active power deficiency; and
when the desired total active power ΔP to be regulated is still not met after the energy-storage power stations are used, using the standby energy-storage power stations in the power distribution system to compensate the active power deficiency to keep the active power of the power distribution system in balance, so as to complete frequency regulation of the power grid.

2. The source-grid-load-storage networked collaborative frequency control device according to claim 1 , wherein the power distribution system comprises the source-grid-load-storage, standby energy-storage power stations and adjacent external systems, and the source-grid-load-storage comprises wind power stations, photovoltaic power stations, micro-grid groups, adjustable loads, and energy-storage power stations.

3. The source-grid-load-storage networked collaborative frequency control device according to claim 1 , wherein acquiring a desired total active power ΔP to be regulated by a power distribution system during a secondary frequency regulation process of a power grid, specific comprises:
detecting frequency disturbance of the power grid, and collecting a current frequency of the power grid when the frequency disturbance of the power grid exceeds a rated error;
in an active response mode, actively giving a response to a frequency deviation obtained after primary frequency regulation to calculate a power difference to be compensated, by the power distribution system;
and in a passive response mode, acquiring, by the power distribution system, a power regulation capacity issued by a power dispatching system,
wherein the power difference to be compensated and the power regulation capacity are each the desired total active power ΔP.

4. The source-grid-load-storage networked collaborative frequency control device according to claim 1 , wherein determining whether the desired total active power ΔP is met after the frequency regulation of the source-grid-load-storage of the power distribution system, comprises:
calculating a total active power regulation capacity C of the source-grid-load-storage of the power distribution system;
comparing the desired total active power ΔP with the total active power regulation capacity C, obtained by calculation, of the source-grid-load-storage of the power distribution system;
if ΔP≤C, determining that the desired total active power ΔP is met after coordinated operation of the source-grid-load-storage of the power distribution system; or
if ΔP>C, determining that the desired total active power ΔP is not met after coordinated operation of the source-grid-load-storage of the power distribution system.

5. The source-grid-load-storage networked collaborative frequency control device according to claim 1 , wherein when the desired total active power ΔP is not met, coordinating the source-grid-load-storage and other resources in the power distribution system, comprises:
adjusting the regulation capacity of the power generation units, the micro-grid groups and the energy-storage power stations of the source-grid-load-storage of the power distribution system to maximum, and compensating an active power deficiency by the standby energy-storage power stations in the power distribution system.

6. The source-grid-load-storage networked collaborative frequency control device according to claim 1 , wherein when the desired total active power ΔP to be regulated is still not met after the standby energy-storage power stations in the power distribution system are used, adjustable loads of the source-grid-load-storage are deployed to decrease or increase active power consumption.

7. The source-grid-load-storage networked collaborative frequency control device according to claim 6 , wherein when the desired total active power ΔP to be regulated is still not met after the standby energy-storage power stations in the power distribution system are used and the adjustable loads are deployed, adjacent external systems and active power of other power distribution networks are used to compensate the active power deficiency.

8. The source-grid-load-storage networked collaborative frequency control device according to claim 7 , wherein the source-grid-load-storage networked collaborative frequency control method further comprises: allocating the power regulation capacities to the units in the power distribution systems according to a principle of economic optimality when the standby energy-storage power stations and the adjacent external systems are used and the adjustable loads are deployed for active power compensation.

9. The source-grid-load-storage networked collaborative frequency control device according to c

Assignees

• Univ Nanjing Posts & Telecommunications
• State Grid Electric Power Res Inst
• State Grid Electric Power Rerearch Inst Co Ltd

Inventors

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

Classifications

• H02J2103/35

  Grid-level management of power transmission or distribution systems, e.g. load flow analysis or active network management · CPC title

• 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