基于锁相放大器原理的基波无功检测方法研究

无功补偿控制系统需要快速、准确地检测出系统基波无功功率以及功率因数等参数,用以控制无功补偿设备输出系统所需的基波无功功率。针对现有检测方法受电网以及无功补偿设备本身产生的谐波影响而造成计算结果准确度降低、计算速度慢等问题,基于锁相放大器原理,提出一种适用于无功控制系统的快速、准确的基波无功功率以及功率因数检测方法;在Matlab上进行了仿真分析,对比了含有多种谐波时,不同信噪比下各参数的最大误差,并搭建了实验平台,以Fluke-435-II电能质量分析仪验证该方法的准确性;经仿真和实验表明,该方法可以在含有谐波时准确、快速地检测出系统的基波无功功率及功率因数,为无功补偿系统的无功检测提供了理论依据和实用方法。

Study on Fundamental Reactive Power Detection Method Based on Phase-locked Amplifier Principle

The reactive compensation control system needs such parameters which detect quickly and accurately the fundamental reactive power and power factor of the system so to control the fundamental reactive power of for the output system of reactive power compensation equipment.In view of such problems in the existing detection method as reduction of calculation result and slow calculation speed due to the harmonics of network and the reactive power compensation equipment itself and on the basis of the principle of phase-locked amplifier,a kind of fast and accurate fundamental wave reactive power and power factor detection method is proposed.Simulation analysis is carried out on Matlab,the maximum errors of each parameter at different SNR in case of containing multiple kinds of harmonics are compared.The experimental platform is set up and the accuracy of the method is verified by Fluke-435-II power quality analyzer.It is shown by the simulation and experiment that this method can,in case of containing harmonics,detect accurately and quickly the fundamental reactive power and power factor of the system and has provided theoretical basis and practical method for reactive power detection of the reactive power compensation system.