交流励磁发电机的仿真分析

交流励磁发电机的励磁一般是由交-交变频器提供,但是由于变频原理、控制算法的误差以及线路参数的不对称,最终导致变频器的三相输出波形与标准正弦波相比,存在波形不对称、畸变较大的问题.在这种情况下单纯使用解析法进行仿真分析将会产生较大的误差,并且不能与外围硬件电路相结合,因此无法对包括变频器在内的整个交流励磁发电机系统直接进行仿真.交流励磁发电机的动态仿真等效电路的建立,是以交流电机的基本电磁关系为基础,针对解析法的缺点,通过电路的形式,将电机本身各项参数和外界的输入变量结合在一起,客观地反映出发电机运行过程中输出量与输入量及参数之间的相互关系.文章以该等效电路为基础,对交流励磁发电机系统进行了仿真分析,并与实验结果对比,讨论了谐波含量.

The Dynamic Equivalent Circuit of Variable Speed Constant Frequency Generator

Cycloconverter can provide excitation for AC exciting generator(ACEM),but its control theory and calculation errors lead to the problem that there are aberrance and dissymmetry in the 3-phases output waves.Under this condition,using mathematic model to simulate and analysis ACEM will result in biggish errors.Especially,mathematic model can't be connected with other simulation circuits,so it is impossible to simulate the whole ACEM system directly.The dynamic equivalent circuit,based on the basic electromagnetic theory of generator,contacts output variables with input variables and generator's parameters in the form of circuit.The whole ACEM system including Cycloconverter circuit is simulated and analyzed in this work by dynamic equivalent circuit,and the simulation results are compared with experiment,the discussion of harmonic components are gave too.