Variable integral coefficient virtual synchronous machine frequency recovery control method
A virtual synchronous machine, frequency recovery technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve the problem of fuzzy frequency recovery trigger signal design, improve safety and stability, prevent short-term The effect of exceeding the limit and improving stability
Active Publication Date: 2021-11-16
YANSHAN UNIV
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Problems solved by technology
In the traditional VSG frequency recovery strategy, the integral coefficient of the integral feedback link is a fixed value, and the integral coefficient of the fixed value has a contradiction between rapidity and stability during the frequency recovery process.
At the same time, the design of the frequency recovery trigger signal in the existing technology is relatively vague
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[0040] Below in conjunction with embodiment the present invention is described in further detail:
[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
[0042] as attached Figure 1 to Figure 11 As shown, a frequency recovery control method of virtual synchronous machine with variable integral coefficient aims to solve the contradiction between rapidity and stability in the process of frequency recovery of traditional strategies, and to improve the design of frequency modulation trigger signal, etc., including the following steps :
[0043] Step S1: Add a ...
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The invention discloses a variable integral coefficient virtual synchronous machine frequency recovery control method, and relates to the technical field of micro-grid distributed power generation. The method comprises the following steps of: adding an integral feedback link with a gain of Ki into an active control loop of a virtual synchronous machine control strategy, and realizing frequency recovery control by starting the integral feedback link; determining the time when a frequency recovery control strategy is started through a frequency recovery trigger signal Sr; and configuring different integral coefficients for frequency recovery by judging whether df / dt is equal to 0 or not. Compared with a traditional frequency recovery strategy, accurate switching of two operation modes, namely conventional VSG control and frequency recovery control is realized through design of the frequency recovery trigger signal Sr; meanwhile, in the frequency recovery process, the small falling depth can be obtained, short-time out-of-limit in the frequency recovery process is prevented, the short recovery time can be obtained, the oscillation problem is avoided, and the operation stability of a whole micro-grid system is improved.
Description
technical field [0001] The invention relates to the technical field of micro-grid distributed power generation, in particular to a frequency recovery control method of a virtual synchronous machine with a variable integral coefficient, which is used for frequency recovery control of a micro-grid inverter. Background technique [0002] The virtual synchronous generator (Virtual Synchronous Generator, VSG) control strategy only has the ability of one-time frequency modulation, and does not have the ability of frequency recovery. When the size of the load is the same as the given active power P of VSG ref When they are not equal, the output frequency of VSG will deviate from the rated frequency under the effect of primary frequency modulation of VSG. If the output frequency of the VSG exceeds the safe operating frequency range of the load, it will affect the normal operation of the load and the stable operation of the microgrid. Therefore, a frequency recovery strategy needs t...
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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/38H02J2203/20
Inventor 王晓寰姜威柴秀慧陈加南赵晓君
Owner YANSHAN UNIV