摘要
分析了发电厂厂用电源现有快切装置的现状和依据,提出了通过计算备用电源电压和母线残压之间的差拍电压有效值与断电后母线残压初始频差的乘积,以预测冲击电流的大小,并以此为判据的快切新原理。该方法综合了现有方案的长处,可避免单一参数(频率差、相角差或电压差)不满足就闭锁快切的弊端。以135MW和300MW机组为例,给出了切换时的实录数据,结果表明:该方法可最大限度地发挥快切的功能,提高快切成功率及切换质量。
The status in quo of the house supply transfer equipment in power plants and its criterion are analyzed. A fast transfer criterion is presented,using the product of the initial frequency difference of the bus residual voltage after outage and the dead beat voltage RMS（Root Mean Square） between the standby power supply voltage and the bus residual voltage to predict the impulse current. It integrates advantages of present schemes and avoids the unreasonable blocking for single unqualified parameter,such as the frequency difference,the phase difference or the voltage difference. Real-time data of 135 MW and 300 MW generator units during transfer show that, the proposed method realizes fast transfer to maximum and improves the success rate and the transfer quality.
出处
《电力自动化设备》
EI
CSCD
北大核心
2006年第6期85-88,共4页
Electric Power Automation Equipment
关键词
厂用电源
快速切换
冲击电流
切换判据
差拍电压
house supply
fast transfer
impulse current
transfer criterion
dead beat voltage
