电力电子电路容错控制研究

Fault tolerant control of power electronic circuit based on MLD model

与电力电子电路的传统开关函数模型相比,由于混合逻辑动态(MLD)模型同时包含电路的控制变迁和条件变迁,因而MLD模型更能精确的反应电路的变化过程。这里建立了电力电子电路的MLD模型,考虑到MLD模型中包含离散变量,传统控制方法不再适用,因而将辅助逻辑变量和辅助连续变量引入模型预测控制(MPC),研究了基于MLD模型和MPC的电力电子电路容错控制及其实现步骤。该方法具有实现简单、容错性能良好、通用性较强的优点。以三相四桥臂逆变电路的容错控制为例验证了该方法的可行性和有效性。

Compared with traditional switching function model of power electronic circuit,mixed logic dynamic （MLD） model can accurately describe the changing process of circuit because the mixed logic dynamic model contains the control change and condition change of circuit. The MLD model of power electronic circuit is established in this paper. Considering that the MLD model contains the discrete variables,the traditional control method is no longer applicable. Therefore,the auxiliary logical variables and assisted continuous variable were introduced into the model predictive control （MPC）. The fault tolerant control and realization steps of power electronic circuit based on MLD model and MPC were researched. The method has the ad-vantages of simple realization,good fault tolerance error performance,strong versatility. The feasibility and effectiveness of this method were verified by the example of fault-tolerant control of a three-phase four-leg inverter circuit.