农村小型水电站励磁系统改造设计

针对新疆老旧小型水电站发电机普遍采用双绕组电抗分流自励恒压系统,在并网运行时容易产生振荡、失磁,甚至失步而解列现象,导致并网运行困难的问题,设计了一种改造简单、成本低、并网运行可靠、安全性好的新励磁方法,即可控两相零式电抗分流励磁系统。试验表明,该系统比原系统电压整定范围大且经济,能可靠并网运行,在小型水电站自励恒压同步发电机运行中该系统是一种值得推荐的新励磁系统,对设计改造农村小型电站具有应用参考价值。

Design and Transformation of Excitation System for Small Hydropower Station in Rural Areas

For the generators of old small hydropower stations in Xinjiang, the dual winding reactance shunt self excitation constant voltage system is commonly used, which is prone to oscillation, demagnetization and even out of step disconnection during grid connected operation. For these problems, a new excitation method with simple transformation, low cost, reliable grid connected operation and good safety, namely, the two phase half wave reactance shunt excitation system, is proposed. Test results show that the new system has a larger voltage setting range than the original system, and it is economical in hydropower station transformation and can support reliable grid connected operation. It is recommended to use this system in the operation of self excited constant voltage synchronous generators of small hydropower stations in rural areas.