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A Frequency Restoration Control Method for Multi-VSG Microgrid with Delayed Switching Characteristics

A technology of frequency recovery and delay switch, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as differential control, and achieve the effect of strong scalability, wide application range, and simple and convenient procedure.

Active Publication Date: 2022-06-24
LIYANG RES INST OF SOUTHEAST UNIV +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As the frequency support unit in the microgrid, the VSG should have the ability to control the primary and secondary frequency of the system in theory, but the conventional VSG control strategy only simulates the primary frequency control (PFC) of the synchronous motor, which is still inherently limited. poor control

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  • A Frequency Restoration Control Method for Multi-VSG Microgrid with Delayed Switching Characteristics
  • A Frequency Restoration Control Method for Multi-VSG Microgrid with Delayed Switching Characteristics
  • A Frequency Restoration Control Method for Multi-VSG Microgrid with Delayed Switching Characteristics

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Embodiment 1

[0043] A frequency recovery control method of multi-VSG microgrid with time-delayed switching characteristics, such as figure 1 shown, including the following steps:

[0044] S1, a module with integral characteristics is added to the active frequency control link of the virtual synchronous machine, so as to improve the frequency characteristics of the virtual synchronous machine and realize the frequency error-free control; such as figure 2 shown, figure 2 It is a schematic diagram of the simulation example of the real-time example of the present invention. The island microgrid contains two VSGs connected to the same AC bus, and each VSG uses this method to control the frequency. The typical VSG active frequency control equation consists of the droop equation and the rotor. The equation of motion consists of:

[0045]

[0046] Among them, P m is the mechanical power of the VSG, P e is the electromagnetic power, P 0 is the rated power, J is the moment of inertia, D is...

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Abstract

The patent of the present invention discloses a multi-VSG micro-grid frequency recovery control method with delay switching characteristics. A module with integral characteristics is added to the active frequency control link of the virtual synchronous machine to improve the frequency characteristics of the virtual synchronous machine and realize frequency error-free control. , and then calculate the time required for the primary and secondary frequency control of the virtual synchronous machine, and determine the delay time parameter accordingly, and then according to the integral coefficient K i In the dynamic change of different time periods, adjust the inertia coefficient J of each VSG, realize the decoupling of the primary and secondary frequency control of the microgrid, and achieve frequency recovery. The whole method process does not rely on communication, and eliminates the microgrid under the premise of ensuring power equalization. Steady-state frequency error to maintain the stability of the microgrid system.

Description

[0001] Field of study [0002] The invention relates to the field of power system microgrid frequency control, in particular to a multi-VSG microgrid frequency recovery control method with time-delay switching characteristics. Background technique [0003] In recent years, the energy problem has become increasingly serious. In order to solve this crisis, new energy power generation technology has been widely promoted and applied. As the main means of distributed energy consumption, microgrid is a hot research topic in recent years. Compared with traditional large grids, microgrids mainly use static inverter components as power interfaces, and the inertia and damping in the system are small, and the frequency is stable. In the island mode, it is easy to be disturbed by the outside world and cannot run stably, and the virtual synchronous generator (VSG) technology provides a new idea to solve the above problems. [0004] The VSG control strategy is mainly used in the distribute...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/46
Inventor 顾伟洪灏灏顾晨骁楼冠男曹戈
Owner LIYANG RES INST OF SOUTHEAST UNIV