Research on quasi-proportional resonant control of three-phase voltage inverter with unbalanced load
To address the imbalance of three-phase voltage inverter under unbalanced load condition,we propose a positive and negative sequence control strategy based on quasi-proportional resonance+double second-order generalized integrator.First,the output voltage under unbalanced load condition is analyzed and the main reason why the linear control algorithm fails to realize the no-static error control is expounded.The suppression of negative sequence component is the main way to address the imbalance.Second,the response curves of the mainstream positive and negative sequence separation methods are compared under different working conditions and the best response performance is selected for discretization.The discretized dual-order generalized integrator is integrated with the control system.The positive sequence and negative sequence components are controlled by quasi-proportional resonance so the closed-loop control system is constructed.The Routh criterion is employed to determine the stability of the closed-loop transfer function,and the value range of the control algorithm parameters is derived.Finally,the feasibility of the proposed control strategy is verified by our simulations and experiments.
three-phase voltage inverterunbalanced loadquasi-proportional resonancepositive and negative sequence separation
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