背靠背变换器的虚拟磁链估计预测控制研究

Research on Virtual Flux Estimation Predictive Control of Back-to-back Power Converter

针对背靠背电压源型功率变换器的控制器优化设计问题,设计了一种含初始偏置补偿的新型虚拟磁链估计方案,并与预测控制结合构建了背靠背变换器的新型控制器。新型磁链估计方案仅有1个采样周期的延迟,在磁链估计的初始阶段具有更高精度,因此优于传统磁链估计方法。同时在直流链路控制和空间矢量调制的基础上,设计了变换器网侧和负载侧的固定开关频率预测控制器。最后,基于现场可编程门阵列完成了算法实现,并在变换器测试平台上进行了试验,试验结果验证了新型控制方案的效果。

Aiming at the problem of the controller optimization design for back-to-back voltage source power converter,a new virtual flux estimation scheme with initial bias compensation was designed,which was combined with predictive control to construct a new controller for back-to-back converter.The new flux estimation scheme had only one sampling period delay,which was more accurate in the initial stage of the flux estimation,and was superior to the traditional flux estimation method.At the same time,based on the consideration of DC link control and space vector modulation,the fixed switching frequency prediction controller of the converter grid side and the load side was designed.Finally,the algorithm was completed based on the field programmable gate array,and the experiment was carried out on the converter test platform.The test results verify the effect of the new control scheme.