特定消谐式变频器及其在火电厂中的应用  被引量:8

SELECTIVE HARMONIC ELIMINATION INVERTER AND ITS APPLICATION IN POWER PLANTS

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作  者:张文义[1] 佟为明[1] 杨乐民[1] 徐会明[1] 

机构地区:[1]哈尔滨工业大学电器教研室,黑龙江省哈尔滨市150001

出  处:《电力系统自动化》2004年第6期65-67,93,共4页Automation of Electric Power Systems

基  金:黑龙江省科技攻关项目(G99A11-3)

摘  要:设计了一种特定消谐式变频器,其每周期的开关角个数随输出频率而改变。根据变压变频的要求确定存储器中开关角的存储方式,通过锁存电路使变压与变频同步,以避免输出波形中电压尖峰的产生。在发电厂中的运行结果表明,该变频器节能效果明显、变频工作稳定、消除谐波次数多、残余的谐波分量幅值小、使电动机发热损耗小。A kind of selective harmonic elimination inverter is designed and the number of its switching angles in every period is varied with output frequency. The memory mode of switching angles in the memorize is determined according to the request of VVVF(variable voltage variable frequency) and the variable voltage is made synchronous with the variable frequency by lock-on circuit for avoiding the appearance of voltage pinnacle in output waveform. The experimental results in power plant show that the designed inverter has obvious energy-saving effect, steady frequency transformation, the ability to eliminate various orders harmonic, the small amplitude of remnant harmonic and the small heat loss from electromotor.

关 键 词:特定消谐 变频器 开关角 火电厂 节能 

分 类 号:TM621.6[电气工程—电力系统及自动化]

 

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