A secondary frequency regulation control method and system for a virtual power plant through flexible direct current transmission

A technology of a virtual power plant and a control method, which is applied in power network operating system integration, power transmission AC network, AC network voltage adjustment, etc., can solve the control of flexible load participation, little consideration of secondary frequency regulation, and secondary frequency regulation. In order to improve the controllable capacity, improve transient performance, and ensure safe operation

Active Publication Date: 2022-03-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the inventor's understanding, the current way of direct current transmission of energy bases has the following problems: (1) In the current research on energy transmission, only wind power and thermal power are often considered for bundling and transmission, and there is little consideration for the participation of flexible loads; ( 2) In the existing research on flexible DC transmission to achieve inter-regional frequency control, more research has been done on primary frequency modulation, and there are relatively few studies on secondary frequency modulation, among which the improved design of controllers for secondary frequency modulation is also less; (3) Existing research Among the control strategies, there are few studies on reducing the negative impact of regulation behavior on energy base operation through optimization methods.

Method used

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  • A secondary frequency regulation control method and system for a virtual power plant through flexible direct current transmission
  • A secondary frequency regulation control method and system for a virtual power plant through flexible direct current transmission
  • A secondary frequency regulation control method and system for a virtual power plant through flexible direct current transmission

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Embodiment 1

[0039] In the technical solutions disclosed in one or more embodiments, such as Figure 1-4 As shown, a secondary frequency regulation control method for a virtual power plant via flexible direct current transmission, including a load center control method and a virtual power plant control method, the load center control method takes reducing the frequency deviation in the control area as the control goal, and adopts constant frequency control; The virtual power plant control method takes reducing the power deviation between the output power of the virtual power plant and the set value of DC output as the control goal. If the control signal output by the load center control method includes the DC power modulation value of the VSC-HVDC system, the VSC-HVDC The DC power modulation value of the system is used as a feed-forward signal, and a constant exchange power control is adopted.

[0040] This embodiment designs a secondary frequency modulation control strategy between regions....

Embodiment 2

[0115] Based on Embodiment 1, this embodiment provides a secondary frequency regulation control system for a virtual power plant via flexible direct current transmission, which is characterized in that it includes a load center control module and a virtual power plant control module;

[0116] The load center control module takes reducing the frequency deviation in the control area as the control goal, and adopts constant frequency control;

[0117] The virtual power plant control module takes reducing the power deviation between the output power of the virtual power plant and the set value of DC output as the control goal. If the control signal output by the load center control method includes the DC power modulation value of the VSC-HVDC system, the VSC-HVDC The DC power modulation value of the system is used as a feed-forward signal, and a constant exchange power control is adopted.

[0118] Specifically, the load center control module performs the following steps:

[0119]...

Embodiment 3

[0132] This embodiment provides an electronic device, including a memory, a processor, and computer instructions stored in the memory and executed on the processor. When the computer instructions are executed by the processor, the steps described in the method in Embodiment 1 are completed.

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Abstract

This disclosure proposes a secondary frequency regulation control method and system for a virtual power plant via flexible direct current transmission, including a load center control scheme and a virtual power plant control scheme. The load center control scheme is supported by calling the AGC unit and the emergency power of the VSC-HVDC system (Emergency HVDC Power Support, EDCPS), so that the frequency deviation in the control area can be quickly restored to the specified range; the virtual power plant control scheme uses model predictive control to adjust the consumption of electrolytic aluminum load and the output of thermal power units, and reduce the virtual power plant in the process of emergency power support The internal power imbalance ensures its safe operation. This disclosure designs a secondary frequency modulation control strategy between regions. Through the interaction between the two regions, the control command of the load center is sent to the controller of the virtual power plant in the form of a feed-forward signal. The internal power imbalance of the virtual power plant ensures the operation of the industrial power grid. There is no large frequency deviation in the process.

Description

technical field [0001] The present disclosure relates to the technical fields related to power system demand response and flexible direct current transmission, and specifically relates to a secondary frequency modulation control method and system for a virtual power plant through flexible direct current transmission. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] There is a serious reverse distribution problem in energy distribution and load demand in my country. my country's coal resources and wind energy resources are highly overlapping, and they are mainly distributed in the northwest and northeast regions of China. Due to the abundance of coal and wind energy resources, there are a large number of industrial power grids with heavy industrial loads as the core in Northwest my country. In this type of industrial power grid, it often...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02J3/48H02J3/50H02J3/36H02J3/24H02J3/26H02J3/14
CPCH02J3/48H02J3/50H02J3/36H02J3/241H02J3/26H02J3/14H02J2203/20Y04S20/222Y02E60/60Y02E40/50Y02B70/3225
Inventor黎峰张文鲍鹏
OwnerSHANDONG UNIV