数字式工频相位测量仪-论文.doc

南京师范大学泰州学院电力工程学院 数字式工频相位测量仪 PAGE \* MERGEFORMAT PAGE \* MERGEFORMAT I 数字式工频相位测量仪 摘要 相位是交流信号的三要素之一,相位一致,是保证并网电能质量的重要条件之一。一般发电机与系统并网需要三个条件:电压一致,相位一致和频率一致.如果发电机有一个条件不满足,导致非同期并列,会对发电机造成巨大冲击,严重时导致发电机定子变形，从而损坏发电机，同时也会对电网造成极大冲击，影响电能质量和电网安全。 本文研究了同频率正弦信号相位差测量的各种方法和原理；论述了超低功耗MSP430单片机的特性、结构和使用方法；设计了多功能电网电量、相位测量仪的系统结构，完成了电网电压、电流的幅度测量、相位差测量硬件电路设计和软件流程设计。实现了基于MSP430单片机的高精度电量、相位差测量系统。它能够实时测量电网电压、电流以及电压-电压，电压-电流之间的相位差。并对测量中产生的相移误差、计数误差和二路信号幅值不等产生的误差，以及工频干扰对相位测量产生的影响进行了理论分析，为进一步解决这些问题提供了理论依据。 关键词：电网；单片机；相位差；低功耗； PAGE \* MERGEFORMAT PAGE \* MERGEFORMAT IV Digital?frequency?phase?measuring?instrument. Abstract Phase?is?one?of?the?three?elements?of?ac?signal,?and?the?phase?consistency?is?one?of?the?important?conditions?to?guarantee?the?power?quality.?Grid?requires?three?conditions:?general?generator?and?system?voltage,?phase?and?frequency?is?consistent.?If?there?is?a?condition?does?not?meet?the?generator,?cause?than?the?same?period,?can?cause?huge?impact?to?the?generator,?serious?when?lead?to?deformation?of?the?generator?stator,?which?damage?the?generator,?at?the?same?time?will?greatly?impact?to?power?network,?affect?the?power?quality?and?grid?security.In?this?paper,?various?methods?and?principles?of?phase?difference?measurement?of?the?same?frequency?sinusoidal?signal?are?studied.?The?characteristics,?structure?and?usage?of?ultra-low?power?MSP430?single?chip?microcomputer?are?discussed.?The?system?structure?of?multi-function?electric?power?grid?and?phase?measuring?instrument?is?designed,?and?the?circuit?design?and?software?flow?design?of?the?power?grid?voltage,?current?amplitude?measurement?and?phase?difference?measurement?are?completed.?The?high?precision?power?and?phase?difference?measurement?system?based?on?MSP430?single?chip?microcomputer?is?realized.?It?can?measure?voltage,?current?and?voltage?-?voltage,?voltage?-?current?in?real?time.?And?the?measurement?of?phase?shift?error,?counting?error?and?acoustic?signal?amplitude?range,?