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Inverter control method

A control method and inverter technology, applied in the field of microgrid, can solve the problems of system stability threat, frequency adjustment can not be continuous and smooth, etc., to enhance anti-interference and overload capability, improve transient stability, and speed up frequency recovery Effect

Active Publication Date: 2017-12-15
CENT SOUTH UNIV
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Problems solved by technology

[0005] In order to solve the above-mentioned technical problem that the frequency adjustment in the current inverter virtual inertia control method cannot be continuous and smooth, thereby posing a threat to the system stability, the present invention provides an inverter control method, including:

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Embodiment Construction

[0056] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following specific examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0057] Since the rotor inertia and frequency modulation control characteristics of the synchronous generator can improve the stability of the power system, if the distributed power supply can show the characteristics of the synchronous generator with the help of the equipped energy storage link, then the stability of the distributed system will definitely be improved. promote. The main control idea of ​​the current VSG scheme is to simulate the rotor inertia of the synchronous generator and the system's primary frequency modulation characteristics through the construction of virtual inertia and primary frequency modulation power commands, and through current close...

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Abstract

The present invention provides an inverter control method. The method comprises: regulating the angular frequency of real output voltage of an inverter based on the angular frequency and the active power of the real output voltage of the inverter and the angular frequency and the active power of output voltage of the inverter in a rated state and according to the adaptive virtual inertia control equation of the inverter, wherein the adaptive virtual inertia control equation of the inverter is formed by superposition of the inverter virtual inertia control equation and the adaptive virtual inertia coefficient equation. The adaptive virtual inertia coefficient can be subjected to adaptive continuous regulation according to the changing of the angular frequency of the real output voltage of the inverter so as to allow the angular frequency of the real output voltage of the inverter to perform adaptive continuous regulation, namely, the equivalent inertia of the real operation inverter system has smooth and continuous features so as to avoid direct sampling of angular frequency differential items, enhance the system anti-interference and overload capability, improve the frequency dynamic performance and improve the microgrid transient stability.

Description

technical field [0001] The present invention relates to the technical field of micro-grids, in particular to an inverter control method. Background technique [0002] Distributed power generation has the advantages of less environmental pollution, flexible installation location, high energy utilization rate, and less transmission line loss. It is one of the important development trends of the future power system. As an effective carrier for integrating distributed power sources, microgrid can realize self-control, protection and management, which includes various forms of distributed micro sources, energy storage systems, protection devices, loads, etc. Most distributed micro-sources are mostly based on power electronic converter interfaces. Compared with traditional synchronous generators, inverter-type distributed micro-sources have fast response speed, small inertia, and poor overload capacity. Therefore, in order to ensure system stability and power balance, it is neces...

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Application Information

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IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 韩华侯小超孙尧栗梅柳张杰李浪刘尧
Owner CENT SOUTH UNIV
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