The off-grid voltage control of the three-phase inverter is proposed that provides excellent steady-state and dynamic performance of the output voltage. State feedback and complex variable resonant controllers are used for zero steady-state control of the output voltage based on the state-space model. Feedforward links of load current and reference are added to the control structure. The feedforward gain is designed according to the principle of closed-loop zero and dominant pole pair elimination, so that the response speed of the output voltage is fasten greatly.
 

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