电能计量用谐波电源离散域建模与仿真

摘要

电能计量用的谐波电流源要求具有很强的谐波生成能力,因此对采样频率要求较高.目前,绝大多数谐波电源装置采用DSP或单片机作为控制芯片,由于采样率的限制,不能满足电能计量用谐波电流源精度要求.针对上述问题,提出将FPGA应用于谐波电流源的研究中,采用基于SPWM的双闭环PI控制策略,在MATLAB/Simulink和基于加拿大Lyrtech公司的VHS-ADC这—FPGA高速信号处理平台上搭建模型,对电力系统稳态下的谐波和各种暂态扰动信号进行仿真.仿真结果表明,输出波形稳定,畸变率较小,验证了离散域模型的正确性.%Strong harmonic synthesis is required to harmonic current source used in electric energy metering; so it demands a higher sampling frequency. At present; DSP or MCU as the controller chip is used to the majority of harmonic current source devices. Because its sampling frequency is not high; the sampling accuracy requirement of harmonic current source used in electric energy metering isn't satisfied. In response to above problems; in this paper; FPGA is applied to the research of harmonic current source; based on double closed-loop PI SPWM control strategy; control model domain is built on MATLAB/Simulink and VHS -ADC high -speed signal processing platform. Harmonics of steady-state and disturbance transient are simulated. The results of simulation show that the stability of the output waveform has good dynamic performance and less distortion; which verified the correctness of discrete domain model.