摘要
12/3相双绕组异步发电机是将交直流双绕组发电理论应用到异步发电中、作为独立电源而提出的。这种电机在定子上布置了两套绕组,即一套4Y移15°十二相整流绕组和一套三相静止励磁绕组(或称补偿绕组)。其中整流绕组经整流桥向直流负载供电,而励磁绕组提供无功功率,以保持负载时整流绕组端电压不变。当发电机十二相绕组并接起励电容后起动时发生了高次谐波谐振,导致无法建立基波电压。该文分析了发生谐振后的电机内气隙磁场的特点,查明了发生谐波谐振的原因,提出了研究双绕组异步发电机自激起励时谐波谐振问题的数学模型,并得出了发生谐振后的稳态等值电路,最后得到谐振频率的计算公式。计算结果与试验数据的比较表明该文提出的数学模型是正确的。
In order to apply the theory of AC&DC dual stator winding generator to asynchronous generating, a new type of 12-&3-phase double-winding asynchronous generator is presented for isolated applications.In this generator, two sets of winding are embedded in the stator slots.One, referred to as the 12-phase DC winding,supplies power to the DC load via a bridge rectifier;and the other,termed the 3-phase compensating winding,provides reactive current to maintain the output voltage of the DC winding terminals varied with load. When four groups of excitation capacitances are connected across its 12-phase DC winding terminals, and its rotor is driven by a primemover, the harmonic resonance,which is sometimes the 5th,sometimes the 7th, is observed. As a result, the fundamental voltage can not be established normally.In this paper, the characteristic of airgap magnetic field after resonance occurring is analyzed. The causation of harmonic resonance is found. In order to study the harmonic resonance of 12-&3-phase double-winding asynchronous generator dining its self-excitation, the mathematical model is acquired, then the steady state equivalent circuit is derived, and the formula to calculate the resonant frequency is educed.The compare between calculating result and experimental data indicates that the mathematical model derived in this paper is precise.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第6期167-171,共5页
Proceedings of the CSEE
关键词
12/3相双绕组异步发电机
自激起励
谐波
谐振
励磁绕组
数学模型
12-&3-phase double-winding asynchronous generator
Excitation capacitance
Harmonic resonance
Airgap magnetic field
Mathematical model
Resonant frequency
