LOW FREQUENCY CHARACTERISTIC CORRECTION METHOD OF VSG BASED ON TORQUE QUANTITATIVE ANALYSIS
Firstly,a virtual torque model of virtual synchronous generator(VSG)is established,and the quantitative analysis of virtual torque reveals the main factors that lead to change of the low-frequency characteristics of VSG.That is the coupling effect of sub synchronous resonance on the low-frequency characteristics of VSG and the negative damping effect of phase-locked loop.On the basis of demonstrating the feasibility of increasing damping to suppress sub synchronous resonance,a joint valuing method for steady-state damping and dynamic damping is proposed,and then the influence of dynamic damping on VSG performance is pointed out.The feasibility of suppressing low-frequency oscillations through phase compensation method is demonstrated,and the consistency of the performance indicators of VSG with design expectations is ensured through quantitative correction of VSG torque.Finally,the correctness of theoretical analysis and the effectiveness of design methods are verified through experiments.
invertervirtual synchronous generatorlow frequency oscillationdamping torquephase compensationtorque correction
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