电流源型半桥变换器的鲁棒控制

Robust control of current-fed half-bridge converter

为抑制电流源型半桥变换器升压过程中的干扰信号,提出一种基于相似反对称结构设计的鲁棒控制方案.通过分析开关模式和工作过程,并考虑电源电压波动和负载扰动的影响,采用状态空间平均法建立带有不确定项的数学模型.利用相似反对称结构的逆推方法设计闭环控制器,保证了直流母线电压的稳定,并通过李亚普诺夫理论分析系统的动态性能,得到系统快速性的调节方法.仿真结果表明,该方案不仅对不确定性具有较好的鲁棒性,且对外部扰动具有较强的抑制作用.

To suppress the interference signal in voltage boosting process of current-fed half-bridge con- verter （CFHBC）, a robust control scheme was proposed based on the similar skew-symmetric structure. By analyzing the switch modes and work process of the converter and taking account of the influence of supply voltage fluctuation and load disturbance, state-space averaging method was used to derive its math- ematic model with uncertain terms. A closed loop controller was designed with the reverse-derivation from the similar skew-symmetric structure to ensure the stability of the DC-bus voltage. The adjusting method of the system＇s rapidity was obtained by analyzing the dynamic performance of the system with the Lya- punov theory. Simulation results indicated that the closed loop system would be not only robust to the un- certainty, but would also restrain the external disturbance.