一种改进的i_p-i_q无功电流检测方法及其应用

静止无功补偿器(STATCOM)是一种广泛应用的动态无功补偿装置,其指令电流检测一般采用i_p-i_q运算方式。但是,传统的i_p-i_q运算方式直接把负载电流无功分量作为STATCOM输出无功电流指令值,这就要求STATCOM的安装位置必须与负载电流检测点一致,限制了STATCOM位置的灵活选择。针对此问题,提出了一种基于瞬时功率平衡原理的改进的ip-iq无功电流检测方法,该方法引入了检测点与补偿点两处的电压相位信息,使得STATCOM补偿点的位置不再受负载电流检测点的限制。将改进的ip-iq电流检测方法应用到跨变压器STATCOM系统中,仿真结果验证了所提方法的正确性和有效性。

An improved i_p-i_q reactive current detecting method and its application

Static var compensator (STATCOM) is a widely used power electronic device for dynamic reactive power compensation, and ip-iq operation mode is generally used for its reactive command current detecting. However, it is required that the installation position of STATCOM must be consistent with the detecting point of load current when using the traditional i_p-i_q method, in which the load reactive current component is directly used as the command value of STATCOM output current, limiting the flexibility to choose the installation location of STATCOM. To solve this problem, this paper proposes an improved ip-iq reactive current detecting method based on the principle of instantaneous power balance, and the voltage phase information of the detecting point and the compensating point is introduced, making the installation position of STATCOM is no longer limited by the detecting point. The improved ip-iq current detecting method is applied in the system with STATCOM across the transformer, and the simulation results verify the correctness and effectiveness of the proposed method.