Online Voltage Measurement Error Compensation Method for Three-Phase Voltage Source Inverters

In the closed-loop control of the output voltage for the three-phase voltage source inverter, the inaccurate voltage measurement value as the feedback variable could lead to obvious voltage unbalance. To mitigate the voltage unbalance, the voltage measurement is avoided in existing method, which sacrifices the voltage regulation capability. To compensate the measurement error while maintaining the voltage regulation capability, this paper proposed a novel online voltage measurement error compensation method for the three-phase voltage source inverter. In the proposed method, the voltage measurement error is compensated based on the measured fundamental voltage value and integral controllers. Moreover, the proposed method also relies on neither the hardware information of the circuit nor the accurate measurement of other variables. Finally, the simulation and experimental results demonstrate the effectiveness of the proposed method.