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一 概述小型的同步发电机模型广泛用于电力系统的模拟试验研究。目前国内采用的模型机容量为3—30KVA,都是特殊设计和制造的,其标么电抗等参数与原型机是一致的,但受体积小的限制,转子励磁绕组的时间常数 T_(do)却与原型相差很大(五倍至数十倍)。如何有效地提高模型机励磁回路的时间常数是迫待解决的一个重要课题。提高 T_(do)的途径分为两类:一是在励磁回路内串一等效负电阻来补偿绕组多余的电阻,一般称之为负阻器;其二是在转子内增加一个与励磁绕组并绕的采样绕组以测量转子磁链的变化,并把测得的磁链变化引入调节回路,达到控制时间常数的目的,故又称这种
An overview of small synchronous generator model is widely used in power system simulation test. At present, the model machine used in China has a capacity of 3-30KVA, all of which are specially designed and manufactured. The parameters such as reactance are the same as prototypes. However, due to the small volume, the time constant T_ (do) But a big difference with the prototype (five times to several times). How to effectively improve the time constant of the excitation circuit of the model machine is an important issue to be solved. There are two types of ways to improve T_do: one is to add an equivalent negative resistance in the excitation loop to compensate for the excess resistance of the winding, commonly called a negative resistor; and the other is to add an extra field winding And around the sampling winding to measure changes in the rotor flux, and the measured flux changes introduced into the regulation loop to achieve the purpose of controlling the time constant, it is also known as this