基于基波相位补偿策略的无延迟谐波检测

提出了在基于同步参考坐标系的检测算法中引入基波相位补偿实现无延迟谐波检测的策略。采用改进的基于数字信号处理器(DSP)基波提取的混合型检测方案,既有效减小了时延和误差,又使得时延的影响仅局限于基频分量;分析了时延对谐波补偿失效性的影响;介绍了延迟时间的评估和基于同步控制相位补偿的数字实现。实验结果表明,该策略和实现方法硬件简单、成本低,可实现无延迟、高精度的谐波检测。

Harmonic Detection Without Delay Based on Phase Compensation of Fundamental Component

Phase-compensation strategy of fundamental component is introduced into harmonic detection algorithm based on synchronous reference frame. The improved design scheme based on fundamental component extraction using digital signal processor (DSP) is a mixed system, which can reduce time delay greatly and limit its influence only on fundamental component. Theoretical analysis is made on the ineffectiveness of compensation due to the specific time delay, both for single frequency distortion and multiple harmonic distortions. The evaluation of time delay and digital implementation of phase-compensation based on synchronous controlling are depicted. Experimental results show that the proposed strategy and its realization can detect power harmonic accurately, without time delay and with good dynamic performance.