并网逆变器两步预测功率控制策略研究

Research on Multi-step Predictive Power Control Strategy for Two-level Grid-connected Inverter

模型预测功率控制具有动态响应快、约束条件处理简单、稳定性高等优点,广泛应用在并网逆变器的控制中.传统的控制过程存在延时、计算量大、功率波动大等问题.因此,在传统模型预测功率控制理论的基础上,基于单步预测功率控制提出两步预测功率控制方法,并在Matlab/Simulink中搭建仿真模型,对单步预测与两步预测进行对比分析,仿真结果表明,单步预测与两步控制都可以对参考功率进行准确追踪,但两步预测的功率波动和畸变率更小,控制性能更好.

The model predictive power control has the advantages of fast dynamic response/constrained condition processing/stable stability, and is widely used in the control of grid-connected inverters. The traditional control process has problems such as delay, large amount of calculation and large power fluctuation. Therefore, based on the traditional model predictive power control theory, a two-step predictive power control method based on single-step predictive power control method is proposed. Then the simulation model is built in Matlab/Simulink, immediately after the single-step prediction and twostep prediction are compared. The simulation results show that the single-step prediction and the two-step control can accurately track the reference power, but the power fluctuation and distortion rate of the two-step prediction are smaller,control performance is better..