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中文摘要：
针对现有的基于同步旋转坐标系dq0的统一电能质量调节器（UPQC）模型中存在双环强耦合特性，在推导了αβ变换和dq0变换之间存在对偶变换关系的基础上，证明了上述耦合问题属于αβ和dq0之间对偶变换关系中的特例，可通过增加1次从dq到αβ的变换实现完全解耦。解耦后的模型可以极大简化控制过程和参数的设计。在此基础上提出了基于两相同步旋转dg坐标系的UPQC完全解耦的新型直接控制策略，该策略中串联有源电力滤波器部分控制设计为受控电流源，使得电网电流被控为正序基波电流；而并联有源电力滤波器被控制为受控电压源，使得负载侧的电压被控为标准正序基波电压。大量EMTDC／PSCAD仿真表明，通过增加1次αβ变换，使得咖两相中的各交叉耦合量实现了完全解耦，控制过程变得更加简捷，也有利于UPQC的参数计算和设定。
英文摘要：
Based on the deduction of the duality relation between the αβ transformation and dqO transformation, it is proved that, the double loop coupling existed in the model of UPQC based on the dqO system is a special case in the transformation between αβ and dq0, which can be completely decoupled by adding a transformation from dq frame to αβ frame. With the decoupled model, the control process and parameter design can be greatly simplified, for which, a completely decoupled direct control strategy of UPQC is proposed based on the two-phase synchronous rotating dq frame. The series APF is designed as a controlled current source,making the current at source side a positive sinusoidal fundamental current,while the shunt APF as a controlled voltage source,making the load voltage a normal positive fundamental voltage. Simulation results with EMTDC/PSCAD software show that, the cross-coupled vectors of dq phases are completely decoupled by adding a transformation from dq system to αβ system, the control process becomes much simpler and the calculation and design of UPQC parameters easier.
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