不控整流电路不平衡电压工况特性分析

Analysis on Operation Performance of Uncontrolled Rectifier Circuit Under Unbalance Voltage Condition

较小的电压不对称可能导致整流电路较大的输入电流不对称,并引入较高3次谐波电流,从而对电网造成较大的危害。对不对称电压条件下的整流电路输入电流谐波进行了详细的分析,描述了弱不对称电网下输入电流不对称度、3次谐波与负载大小的关系曲线,可以指导整流电路滤波装置设计。分析了整流电路的工作模态,建立了输入输出电流的数学模型,推导了各个模态之间的边界条件,最后对该模型进行了仿真与实验验证。

Slight unbalanced voltage can cause large unbalanced currents in the uncontrolled rectifier circuit and bring large third harmonic currents which can damage the grid seriously.The input harmonic currents of the rectifier circuit was analyzed under unbalanced voltage condition,the relation curve between unbalanced factor of input current,third harmonic currents and loads in slight unbalanced voltage which could guide the filter′s design of rectifier circuit were described in detail.The rectifier circuit operation modes were analyzed and the input/output currents models were built and the boundary conditions between each mode were derived.Finally,the simulation and experiments are given to verify this proposed model.