微机准同期并网合闸分析研究.doc

浙江科技学院本科毕业设计(论文)浙江科技学院本科毕业设计(论文)浙江科技学院本科学生毕业设计（论文）题目微机准同期并网合闸分析研究系别自动化与电气工程学院专业班级自动化姓名王芳学号20241007指导教师周国平职称副教授二零零六年六月九日摘要依据电压差和频率差在允许范围内，跟踪相位差，预测最佳合闸角，在导前时间，发出合闸命令，瞬间发电机和电网的相位差为0，实现发电机同期并网。采用PIC16F77单片机进行控制，设计一种准同期控制器，通过电压和频率参数调节（升压降压和升速降速）达到相位差寻优并合闸。使用准同期控制器，可以有效防止冲击电流，防止机组受损，提高并网的速度和精度，它可靠的性能，强大的功能，将给水力发电带来更多经济效益。关键词：相位差、导前时间、准同期、电压差、频率差。Abstract:Supposethatvoltagedifferenceandfrequencydifferencelieinapermittedrange,thephasedifferencemustbetrackedinordertoforecastthebestswitchingonangle.Atthemomentoftheforwardtime,releasethecommandofswitchingonandmeanwhilethephasedifferencebetweendynamoandelectricnetis0.Thus,werealizedynamosynchronousincorporatinginthepowernetwork.WeusePIC16F77asCPUtocontrolthewholeprocessandalso,wetrytodesignapreparativeandsynchronouscontrollerviavoltageandfrequencyparametersadjustment(increaseordecreasethevoltageandincreaseordecreasethespeed).Sothatwecanswitchonwhenthephasedifferenceisthebest.Thepreparativeandsynchronouscontrollercaneffectivelyavoiddashcurrentandmachinegroupdamage.Moreover,itcanadvancethespeedandprecisionofincorporatinginthepowernetwork.Itsreliabilityincapabilityandstrengthinfunctionwillbringmoreeconomicbenefittowaterpowerindustry.Keywords:Phasedifference、forwardtime、preparativeandsynchronous、voltagedifference、frequencydifference.目录摘要-----------------------------------------------------------------------Ⅰ1引言---------------------------------------------------------------------11.1目前状况-------------------------------------------------------------11.2传统的装置和操作方法------------------------------------------------11.3出现的问题----------------------------------------------------------11.4问题如何解决--------------------------------------------------------12本次设计构思------------------------------------------------------------32.1同期并网条件--------------------------------------------------------32.2电压控制------------------------------------------------------------32.3频率控制------------------------------------------------------------32.4相位控制------