TRANSIENT STEADY STATE COMPENSATION STRATEGY FOR PARALLEL INVERTERS BASED ON RESIDUAL GENERATOR
A transient steady-state performance compensation control strategy based on residual generator is proposed to address the power quality issues caused by disturbances such as load switching and unbalanced loads in island microgrids,as well as the reactive power imbalance caused by line impedance mismatch.Design of residual generator based on the state space model of each inverter in the inverter parallel system,generate residual r(s),and generate fundamental and non fundamental residuals through low-pass and high-pass filters.Then,from the perspective of disturbance and line voltage drop cancellation,transient compensation controller Q1(s)and steady-state compensation controller Q2(s)are designed,and the specific expressions of the two controllers are derived based on local information to achieve disturbance suppression and reactive power sharing of the inverter parallel system,suppress circulating currents,and compensate for line voltage drop.Finally,the experiments verify the effectiveness of the proposed strategy.
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