级联H桥多电平并网逆变器的模型预测控制研究

模型预测控制由于具有动态响应好、电流跟踪能力精确等优点,现今它已在功率变换器领域成为一种有前景的控制技术。采用一种改进型模型预测控制策略,主要研究级联H桥多电平逆变器的模型预测并网控制,解决多电平并网逆变器计算量大、难以在线实施控制的缺点。以dSPACE/DS1104作为控制器,级联H桥7电平光伏并网逆变器为硬件平台,通过实验验证模型预测控制技术在光伏并网逆变器控制上的优越性能,分析不同功率因数下并网逆变器对电网电流的影响。

Model Predictive Control of Cascade H-Bridge Multilevel Grid-connected Inverter

Recently years, model predictive control (MPC) method has emerged as a promising technique in the current control of power converter due to its advantages such as good dynamic performances and accurate control capability. In this paper, in order to reduce the amount of calculations in the practical implementation, a simplified model predictive current control method for a multilevel cascaded H-bridge grid-connected inverter is presented. A dSPACE/DS1104 and a three cell seven level cascaded H-bridge inverter are used as the experimental platform. The steady-state and dynamic performance of the grid-connected current is investigated with the compensation in reactive power. Simulation and experimental results validate the superiority in grid-connected area of the proposed model predictive control method.