Power Beat Predictive Control Method of Wind Grid Connected Inverter under Harmonic and Imbalance of Power Grid

Abstract:
To improve the power dynamic response performance of wind power grid connected converter and adapt to the extreme environment of power grid, a power beat predictive control method (PBPC) of wind power grid connected converter is proposed. The discrete prediction model of wind power grid connected converter is proposed to predict the next beat switching states, and the switching state from the reference power with the smallest deviation is selected to achieve the high dynamic state of wind power grid connected converter. In view of the voltage harmonics and imbalance of the power grid, a double second-order generalized integrator is proposed to collect the positive sequence voltage fundamental frequency to control the stable operation of the wind power grid connected converter and improve its adaptability to the power grid. Under the MATLAB/Simulink, the proposed power beat predictive control method of wind power grid connected inverter is simulated, and the experimental platform of wind power grid connected inverter is built for experimental research. The results show that using this method, the power response speed of wind power grid connected inverter is fast and the overshoot is small, and it can still operate stably under the condition of grid voltage harmonic and imbalance.