摘要
文献讨论了非线性电阻和电容器并联后,跨接到磁场绕组两端的新型灭磁方案,主要是利用磁场开关主触点分断后,由电容器和磁场绕组产生谐振,导致电容器电压上升,当电容器电压上升到超过或等于非线性电阻残压时,非线性电阻即投入,电容器上电压不再上升,这种灭磁的方法,对灭磁开关的开断弧压要求降低了,本文进一步探讨自并励水轮发电机空载误强励下,用新方案灭磁的情况,这里利用了在d,q轴坐标下同步电机Park方程,考虑了阻尼绕组和发电机空载特性饱和的影响,进行了仿真,得到了预期的结果。
A new de-excitation method, in which capacitors with parallel connected varistor are connected to both terminals of field winding described in literature[1]. It utilizes resonance produced between capacitors and field winding, soon after field breaker opening. The resonance causes voltage rise of the capacitors . Varistor will put into operation when voltage of the capacitors rises higher than threshold value of the varistor Then voltage of the capacitors no long rises. Requirement for arc voltage of field breaker opening in this case is decreased. In the paper, with the new de-excitation method, de-excitation a self-shunt excited no-load generator after mal-forced excitation is studied. Park equations in d,q axis of synchronous generator with damping winding in rotor are used. Besides influence of saturation of no-load characteristic of generator is accounted. Finally an example simulation is implemented and the predicted results are obtained.
出处
《电气技术》
2007年第8期43-47,共5页
Electrical Engineering
关键词
水轮发电机
自并励
灭磁
电容器
非线性电阻
hydraulic generator
self-shunt excitation
de-excitation
capacitor
varistor
