谐波及无功电流的直接检测方法

HARMONIC AND REACTIVE CURRENTS DETECTION FOR ACTIVE POWER FILTER

分析了现有的谐波及无功电流检测方法 ,提出了一种快速的谐波及无功电流直接检测新方法。该直接检测方法引入比例微分环节 ( PD)作为负反馈 ,可以补偿滤波环节的延时 ,显著提高动态响应速度 ,并具有较好的检测精度。当电网电压不对称时该方法同样适用。最后 ,通过 MATLAB仿真 。

The existing methods for detecting harmonic and reactive current are analyzed and a new speedy direct detecting method is brought forward. In this method, the PD negative feedback is proposed, which can compensate for the inherent delay of LPF and quicken the dynamic response speed evidently. Meanwhile this method has better detecting precision. Furthermore,it can also be applied to the unsymmetrical voltages. Finally,the effectiveness of this speedy direct detecting method is verified by MATLAB simulation.