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本文探讨了一种新的发电机有功信号和无功信号测量电路.电路中采用了集成度较高的全波相敏整流放大器,从而减少了电路元件数目,提高了可靠性.用有功信号、无功信号来构成可控硅励磁系统中的调差单元,欠励限制单元,可简化电路,方便调试与整定.此外,用有功信号来构成电力系统稳定器(PSS)也很方便.本文还介绍了恒cos(?)励磁调节方式,并对此种励磁方式的稳定性进行了研讨.指出了提高此种励磁方式稳定性的方法,在实验机组上进行了验证.按恒cos(?)调节励磁,可解决小型发电机组因励磁系统功能不完善难以并网运行的问题.若将恒cos(?)励磁调节方式用于同步电动机,则可用同步电动机的虚功改善实功冲击造成的电压波动状况.
In this paper, a new generator active signal and reactive signal measurement circuit is discussed.The full-wave phase-sensitive rectifier amplifier with high integration is adopted in the circuit, so as to reduce the number of circuit components and improve the reliability.With the active signal, The reactive signal forms the transfer unit and the under-excitation unit in SCR excitation system, which simplifies the circuit and facilitates the debugging and tuning. In addition, it is also very convenient to form the PSS with active signal. The method of constant cos (?) Excitation regulation is introduced, and the stability of this excitation method is discussed. The method of improving the stability of this excitation method is pointed out and verified on the experimental unit. Adjusting the excitation can solve the problem that the small generator set can not be connected to the grid due to the imperfect excitation system function.If constant cos (?) Excitation regulation method is used for the synchronous motor, the imaginary power of the synchronous motor can be used to improve the voltage Fluctuation conditions.