自动跟踪电网频率SPWM系统的设计  

Design of SPWM System Based on Automatic Tracking Grid Frequency

作　　者：郑为进 陈宇晨[1] 宋萌[1] 侯昀[2] 

机构地区：[1]上海工程技术大学电子电气工程学院,上海201620 [2]上海市电力公司市南供电公司,上海200122

出　　处：《仪表技术与传感器》2014年第6期120-122,125,共4页Instrument Technique and Sensor

基　　金：上海市科委项目(10160501700)

摘　　要：为了研究基于电网频率实时变化的SPWM(Sine Pulse Width Modulation)技术。分析不对称规则采样SPWM算法原理,将电网频率跟踪技术和SPWM技术结合起来,设计一种自动跟踪电网频率SPWM波产生系统,该系统由电压互感器、抗混叠滤波、同步采样、DSP(Digital Signal Processor)和示波器显示5部分模块组成,重点研究基于DSP的电网频率测量单元和SPWM波产生单元的实现过程及原理,设计了硬件电路和软件程序,完成了系统的调试。试验结果表明:该系统能够在线实时自动检测电网的频率,产生跟踪电网频率SPWM波,且波形失真率小、抗干扰能力强。In order to study SPWM technology based on the grid frequency of real-time changing,this paper analyzed the principle of SPWM algorithm,which is based on the asymmetric regular sampling.To combine power grid frequency tracking technology and SPWM technology,a kind of automatic tracking grid frequency SPWM wave generating system was researched and designed.The system consists of voltage transformer,the anti aliasing filter,synchronous sampling,DSP and oscilloscope display of five parts.The key research was the grid frequency measurement unit based on DSP and the realization process and principle of the SPWM wave generating unit.We also designed the hardware circuit and software program and completed the debugging of the system.The analysis of the experiment results show that the system can automatically measure the frequency of the power grid online and produce the SPWM wave of tracing power grid frequency with a small waveform distortion rate and a strong anti-interference ability.

关 键 词：跟踪电网频率 SPWM技术 不对称规则采样 DSP 

分 类 号：TM46[电气工程—电器]