Virtual Inductance Control Method and System for Suppressing Frequency Oscillation of Virtual Synchronous Generator
A technology of virtual inductance and virtual synchronization, which is applied in reducing/preventing power oscillation, wind power generation, photovoltaic power generation, etc. It can solve the problems that the subsynchronous oscillation suppression of the grid-connected VSG system cannot be realized, so as to avoid cost and hardware modification and improve stability performance, the effect of solving the problem of system instability
Active Publication Date: 2022-08-09
李畅
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Problems solved by technology
Existing inverter or grid-connected VSG oscillation suppression schemes are based on voltage and current inner loop double-loop control to suppress inverter or grid-connected VSG oscillation, which cannot achieve subsynchronous oscillation suppression of grid-connected VSG systems without double-loop control structure
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[0054] In order to facilitate those skilled in the art to better understand the improvements of the present invention relative to the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0055] The main technical ideas of the following embodiments are as follows: according to the principle of power conservation, the virtual inductance control introducing active power and reactive power feedforward is simulated to adjust the power coupling degree, so as to realize the decoupling of the active power and reactive power of the virtual synchronous generator. The stability analysis of the grid system is carried out from different grid impedances, and then virtual inductance control is introduced to analyze the influence of the virtual inductance on the system stability, so as to calculate the virtual inductance value required to maintain the system stability under high power coupling. In order to realize the p...
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The virtual inductance control method and system for suppressing the frequency oscillation of the virtual synchronous generator, by establishing the system power model before and after the introduction of the virtual inductance, according to the principle of power conservation, by means of active power and reactive power feedforward to simulate the addition of the L filter inductance Inductance, and then according to the stability criterion to calculate the virtual inductance value required to keep the system stable under high power coupling. The present invention only introduces a virtual inductance to increase the filter inductance value, and does not need to add a new inductance to the filter, but adds an inductance to the control scheme, which avoids extra cost and hardware modification. At the same time, the present invention establishes a virtual inductance The active power and reactive power feedforward virtual synchronous generator (VSG) grid-connected model, the root locus of the eigenvalues shows that the virtual inductor feedforward control scheme can effectively suppress the frequency oscillation of the grid-connected VSG system, and it can be When the power and power are highly coupled, the system can run stably and maintain the steady-state performance and dynamic performance of the system.
Description
technical field [0001] The invention relates to the technical field of power electronic device control, in particular to a virtual inductance control method and system for suppressing frequency oscillation of a virtual synchronous generator. Background technique [0002] In recent years, more and more distributed renewable energy generation has been integrated into the traditional power system, which makes the grid energy structure more and more complex. Due to the grid-connection of renewable energy generation, the power system exhibits significant characteristics of small inertia and poor damping, which causes the frequency change rate and frequency offset to fluctuate in a wide range when the system is disturbed, threatening the safe and stable operation of the AC power system. . [0003] Virtual synchronous generator control simulates the inertia and damping characteristics of traditional synchronous generators, and is an emerging technology to improve system inertia an...
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IPC IPC(8): H02J3/24H02J3/48H02J3/50H02J3/01H02J3/42
CPCH02J3/241H02J3/48H02J3/50H02J3/01H02J3/42H02J2203/10H02J2203/20Y02E40/40
Inventor 李畅
Owner 李畅