基于LabVIEW的有源电力滤波装置数据采集系统

在有源电力滤波装置的研发过程中,需要对电路参数、功能特征进行试验验证。现阶段应用于采集及研发分析的数据采集系统不能满足有源电力滤波装置整个研发阶段的需求。针对这一现状,设计了一种可以应用于研发试验和委托试验的数据采集系统,实现了对有源电力滤波装置运行状况的实时监控、异常报警的功能,以及自动计算产品谐波滤除率、总谐波滤除率、响应时间、有功功率损耗等指标参数的功能,同时也实现了产品交流输入过欠压保护、输出过电流保护、限流保护等保护功能的验证。经过试验验证,设计的采集系统能够满足有源电力滤波装置研发过程的运行数据在线监测、特征参数自动计算的智能化需求,完成相关标准的试验项目测试。

Coordination of multiple grid-connected inverters for harmonic compensation

For multiple grid-connected inverters with active filter function,it makes sense to regulate every unit to output maximum active power from photovoltaic arrays,as well as eliminate the harmonic due to the non-linear loads connected to the electric networks.Naturally,a centralized control coordination strategy was proposed for the purpose of high facility utilization,good harmonic compensation ability and unwanted overcompensation condition.Based on a vector decoupling control scheme and generalized instantaneous reactive power theory,the solution was to allocate the harmonic eliminating task for every inverter according to the instantaneous power margin of each.The grid current always keeps sinusoidal in spite of non-linear load change and output active power change for any inverter.The simulation results validate the efficacy of the proposed coordination strategy.