电气设备谐波干扰性检测与评估方案

Harmonic Interference Detection and Evaluation Scheme of Electrical Equipment

摘要:

针对风力发电、光伏发电新能源的广泛使用,引入的谐波干扰性问题,本文研究了电气设备谐波干扰性检测与评估方案,设计了电气设备谐波检测系统,包含六大部分：主控电路、电压采样电路、波形转换电路、同步锁相倍频电路、A/D转换电路和液晶显示电路。实现了电气设备信号的采集、波形的转换、信号的倍频放大和信号的显示功能。并且还采用了基于改进DFT和时域准同步算法进行电气设备谐波的检测,实现对谐波精准、稳定的检测。此外还研究了对电气设备谐波评估的方法,采用非干预式估计法对电气设备谐波进行评估,实现了对负荷运行没有影响的情况下进行电气设备谐波的评估。为验证本研究的优越性,做了大量的实验,实验表明了本研究电气设备谐波检测的误差在 范围内,具有高精准度和稳定性。

Abstract:

Aiming at the problem of harmonic interference caused by the wide use of wind power generation and photovoltaic power generation, this paper studies the detection and evaluation scheme of harmonic interference of electrical equipment, and designs the harmonic detection system of electrical equipment, which includes six parts: main control circuit, voltage sampling circuit, waveform conversion circuit, synchronous phase-locked frequency multiplier circuit, a / D conversion circuit and liquid crystal display circuit. The functions of signal acquisition, waveform conversion, frequency doubling and signal display are realized. In addition, the improved DFT and time-domain quasi synchronous algorithm are used to detect the harmonics of electrical equipment, so as to achieve accurate and stable detection of harmonics. In addition, the method of harmonic evaluation of electrical equipment is also studied, and the non intervention estimation method is used to evaluate the harmonic of electrical equipment, so as to realize the harmonic evaluation of electrical equipment without affecting the load operation. In order to verify the superiority of this study, a large number of experiments have been done. The experiments show that the harmonic detection error of electrical equipment in this study is within the range, with high accuracy and stability.