交直流混合微电网中双向AC/DC变换器模型预测控制策略

Predictive Control Strategy for Bidirectional AC/DC Converter in AC/DC Hybrid Micri-grid

基于模型预测控制理论,提出一种应用于交直流混合微电网的双向AC/DC变换器控制策略,用来平衡交直流子网间的能量流动,使系统能够安全可靠运行。为此,建立双向AC/DC变换器的动态模型,在变换器电压空间矢量有限的条件下,根据系统离散时间模型来预测系统下一采样时刻的输出值,利用价值函数确定开关管的状态。仿真结果表明,所提出的控制策略可行、有效。

Based onmodel predictive control theory, this paper presents a kind of control strategAD converter in AC/DC hybrid micro-grid which is to balance energy flow between AC and DC sub-grids and ensure safe and reliable operation of the system. Therefore, it establishes a dynamic model for the bidirectional AC/DC converter which is able to predict the output value of the next sampling t ime of system according t o the discrete t ime model and under the condition of limit space vector of converter voltage. This model can also determines the state of switch tube by using value function. Simulation results indicate that the proposed control strategy is feasible and effective.