基于二阶广义积分器的基波正负序分量检测方法

提出了一种检测基波正负序分量的新方法.首先通过瞬时对称分量法及坐标系变换理论分析了在αβ坐标系下通过90°移相算子实现正负序分量检测的原理;然后构造了基于二阶广义积分器的移相系统.理论分析及仿真结果表明,该移相系统在特定频率下具有90°移相特性,同时表现出滤波作用.采用双线性变换法实现移相系统的离散化,并提出了基于所构...

Detection of fundamental positive and negative sequence components based on second-order generalized integrator

A method of detecting the fundamental positive and negative sequence components is proposed.Based on the instantaneous symmetrical components and coordination transformation,the principle of detecting the fundamental positive and negative sequence components by the 90° phase shift operator in the αβ reference frame is analyzed theoretically.A phase shift system based on SOGI(Second-Order Generalized Integrator) is developed.Theoretical analysis and simulative results show that,the developed system has the characteristics of 90°phase shift at special frequency and serves as a filter.It is discretized by the trapezoidal method and used to detect the fundamental positive and negative sequence components,without PLL and LPF.Simulation results with Matlab / Simulink verify the correctness and effectiveness of the proposed method.