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Frequency control method and system of microgrid converter based on virtual synchronous generator

A virtual synchronous machine and frequency control technology, which is applied in the direction of power network operating system integration, information technology support system, AC network voltage adjustment, etc., can solve the problems of complex parameter design and difficult realization, and achieve simple results

Active Publication Date: 2022-07-22
XIAN XJ POWER ELECTRONICS TECH +3
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Problems solved by technology

[0004] The purpose of the present invention is to provide a micro-grid converter frequency control method and system based on a virtual synchronous generator to solve the problem that the VSG technology is used to control the frequency of the micro-grid converter, and the existing parameter design is complicated and difficult to implement. question

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  • Frequency control method and system of microgrid converter based on virtual synchronous generator
  • Frequency control method and system of microgrid converter based on virtual synchronous generator
  • Frequency control method and system of microgrid converter based on virtual synchronous generator

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Embodiment Construction

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment of frequency control method of microgrid converter based on virtual synchronous generator:

[0030] The frequency control method of the microgrid converter based on the virtual synchronous generator of the present invention comprises the following steps:

[0031] 1) The microgrid converter is controlled by the virtual synchronous machine model, and the one-time adjustment of the frequency of the microgrid converter is realized by controlling the mechanical torque of the virtual synchronous machine model.

[0032] Among them, the present invention adopts the power frequency controller to control the mechanical torque of the virtual synchronous machine model (also called VSG), so as to realize the primary adjustment of t...

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Abstract

The invention provides a frequency control method and system of a micro-grid converter based on a virtual synchronous generator, belonging to the technical field of frequency control of micro-grid converters. The control method includes the following steps: 1) the micro-grid converter is controlled by a virtual synchronous machine model, and by controlling the mechanical torque of the virtual synchronous machine model, the frequency of the micro-grid converter can be adjusted once; Under one adjustment, when the output power of the microgrid converter and the load are balanced, the electromagnetic power of the virtual synchronous machine model is used as the dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model. The beneficial effects of the invention are: when the output power of the micro-grid converter and the load reach a balance, by using the electromagnetic power of the virtual synchronous machine model as the dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model, the micro-grid is realized. The secondary adjustment of the converter frequency makes the frequency of the microgrid converter stable at the rated frequency, which is simple to implement.

Description

technical field [0001] The invention relates to a frequency control method and system of a micro-grid converter based on a virtual synchronous generator, and belongs to the technical field of frequency control of micro-grid converters. Background technique [0002] For an AC microgrid system, frequency stability is a necessary condition for the reliable operation of the system. The most common frequency control of the microgrid converter is to use active power-frequency droop control: the microgrid converter adaptively adjusts the output power and operating frequency point according to the droop curve and the detected frequency, the droop control is a one-time adjustment, and the frequency offset is rated work point. In order to realize the error-free control of the frequency, the secondary adjustment of the frequency is usually added, for example, a differential-free controller such as PI is used for adjustment. The introduction of the no-difference controller increases t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/40H02J3/24H02J3/14
CPCY04S20/222Y02B70/3225
Inventor 肖飞王林黄辉魏亚龙李长喜唐启迪祁招
Owner XIAN XJ POWER ELECTRONICS TECH
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