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Microgrid converter frequency control method and system based on virtual synchronous generator

A virtual synchronous machine and frequency control technology, 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 to achieve, and achieve simple effect

Active Publication Date: 2019-06-07
XIAN XJ POWER ELECTRONICS TECH +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Microgrid converter frequency control method and system based on virtual synchronous generator
  • Microgrid converter frequency control method and system based on virtual synchronous generator
  • Microgrid converter frequency control method and system based on virtual synchronous generator

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Embodiment Construction

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

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

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

[0031] 1) The microgrid converter is controlled by a virtual synchronous machine model, and the primary 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 uses a power-frequency controller to control the mechanical torque of the virtual synchronous machine model (also known as VSG), thereby realizing the primary adjustment of the frequency o...

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Abstract

The present invention provides a microgrid converter frequency control method and system based on a virtual synchronous generator, belonging to the technical field of microgrid converter frequency control. The control method comprises the following steps of: 1) employing virtual synchronous machine model for control by a microgrid converter, and controlling the mechanical torque of the virtual synchronous machine model to achieve primary regulation of the frequency of the microgrid converter; and 2) under the primary regulation of the frequency, when the output power of the microgrid converterachieves balance with a load, taking the electromagnetic power of the virtual synchronous machine model as a dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model. When the output power of the microgrid converter and the load achieve balande, the electromagnetic power of the virtual synchronous machine model is taken as the dynamic load compensation amount to compensate the mechanical power of the virtual synchronous machine model to achieve secondary regulation of the frequency of the microgrid converter and allow the frequency of the microgrid converter to be stabilized in a rated frequency, and therefore the implementation is simple.

Description

technical field [0001] The invention relates to a micro-grid converter frequency control method and system based on a virtual synchronous generator, and belongs to the technical field of micro-grid converter frequency control. Background technique [0002] For AC microgrid systems, frequency stability is a necessary condition for reliable system operation. The most common frequency control of microgrid converters 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 working point. In order to realize the non-difference control of the frequency, the secondary adjustment of the frequency is usually added, such as using a non-difference controller such as PI for adjustment. The introduction of non-difference controller increases the difficulty of control parame...

Claims

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Application Information

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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