基于戴维南等效的同步发电机励磁控制静态分析

Based on Thevenin Equivalence Static Analysis of Excitation Control for Synchronous Generator

同步发电机的功角在维护电力系统安全稳定运行中占据重要地位。文中针对发电机励磁控制静态作用以及发电机理论功角与工程实测功角之间的差异进行了分析。首先采用戴维南等效电路研究恒定频率下有功功率及励磁调整电路对单机-无穷大系统的影响,然后用稳态数据进行校验。结果表明,发电机输出有功功率越大,实测功角与理论功角之间的差值越大,会影响机组及系统的运行状态的判断,且自动励磁调节器维持电压恒定的同时将改变端电压的相位。

The power angle of synchronous generator plays an important role in maintaining the safety and stable operation of power system. The static effect of generator excitation control and the difference between the theoretical power angle of generator and the measured power angle of engineering were analyzed in the proposed paper. Firstly, the Thevenin equivalent circuit is used to study the influence of the active power and excitation adjustment circuit on the single-infinity system at constant frequency. Then the steady-state data is used to verify the mathematical relationship. The results showed that the greater the active power of the generator output, the greater the difference between the measured power angle and the theoretical power angle, which affected the judgment of the operating state of the unit and the system. The automatic excitation regulator changed the phase of the terminal voltage while maintaining the constant voltage.