论文部分内容阅读
配电静止同步补偿器(distribution static synchronous compensator,DSTATCOM)用于负荷补偿时,补偿电流指令信号的检测环节对其补偿性能有着重要的影响。该文提出了一种基于同步旋转坐标变换的谐波、无功和负序电流综合检测方法。该方法利用电网电压中的一相电压构造虚拟的对称三相系统,然后以对称三相电压形成的合成矢量作为同步旋转坐标系中的d轴,将负荷电流矢量投影到电网电压矢量上,通过低通滤波器后便可得到要检测的补偿电流指令信号。与传统的同步旋转坐标变换法相比较,该方法计算简单,且在电网电压不对称条件下,仍能很好地检测出负荷电流中的谐波、无功和负序分量,满足DSTATCOM负荷补偿的要求。同时还根据功率平衡准则对文中所提检测方法的原理进行了简单的分析。理论分析和仿真结果证明了该文所提检测方法的正确性和有效性。
When distribution static synchronous compensator (DSTATCOM) is used in load compensation, the detection of compensation current command signal has an important influence on its compensation performance. In this paper, a new method of integrated detection of harmonic, reactive power and negative sequence current based on synchronous rotating coordinate transformation is proposed. In the method, a virtual symmetrical three-phase system is constructed by using one phase voltage in the grid voltage. Then, a composite vector formed by symmetrical three-phase voltages is used as the d axis in the synchronous rotating coordinate system, and the load current vector is projected onto the grid voltage vector. After the low-pass filter can be detected to detect the compensation current command signal. Compared with the traditional synchronous rotating coordinate transformation method, this method is simple to calculate, and it can still detect harmonics, reactive power and negative sequence components in the load current under the condition of unbalanced grid voltage and satisfy the requirements of DSTATCOM load compensation Claim. At the same time, according to the power balance criterion, the principle of the detection method in this paper is briefly analyzed. Theoretical analysis and simulation results prove the correctness and validity of the proposed method.