摘要
具有不同电压等级高压母线的电厂,在发生6 kV厂用电环并切换时将形成高低压环网并产生环流,其大小主要取决于环网断口两侧电压相量差,两侧电压幅值差直接影响无功环流大小,两侧电压相位差直接影响有功环流大小。以某具体电厂为例,使用BPA程序建立计算模型,分析了不同运行方式下高低压环网中环流的大小及其影响。在高低压母线间联络变压器投运下,断口两侧电压之间主要是幅值差,将产生较大的无功环流;在高低压母线间联络变压器退出运行下,断口两侧电压之间主要是相位差,产生较大的有功环流。通过调节变压器分接头可以减小引起无功环流的电压幅值差;有功环流的调整相对较困难,为了防止较大的有功环流必须避免高低压联络变压器退出运行情况下进行环并操作,也可以通过采用移相器等措施调整相位以减少有功环流。
The 6 kV breaker switching operation in a power plant with different voltage buses may form a looped electric network connecting high and low voltage buses and generate circular power flow,which depends on the voltage difference. The circular reactive power is decided by the magnitude difference and the circular active power by the phase difference. With a power plant as an example,the calculation mode/ is built with BPA simulation program to analyze the circular power flow under different operation modes. When the substation transform connecting high and low voltage buses is in operation,there is mainly magnitude difference,resulting in heavy circular reactive power;when the substation transform is out of operation, there is mainly phase difference,resulting in heavy circular active power. The circular reactive power can be eliminated by regulating transformer tap. The circular active power is difficult to eliminate. To prevent large circular active power,the breaker switching should be avoided when the tied transform is out of operation, or the phase-shifter applied.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第7期142-145,共4页
Electric Power Automation Equipment
基金
长江学者和创新团队发展计划资助项目(IRT0515)
华北电力大学博士学位教师科研基金项目~~
关键词
环网
有功环流
无功环流
潮流计算
移相器
looped electric network
circular active power flow
circular reactive power flow
power flow calculation
phase- shifter
