With the integration of large-scale renewable energy and various new types of loads, the stochastic fluctuation characteristic of the power has seriously affected the secure and stable operation of interconnected power grids. In addition to active power fluctuations of AC tie-lines that have been studied in the past, the problem of dynamic fluctuation of bus voltage is also increasingly prominent. Firstly, the typical power fluctuations of electric railway traction load, smelting load, and wind power generation in modern power systems are presented and the accompanying voltage fluctuations are analyzed. Secondly, the dynamic fluctuation mechanism and distribution characteristic of the system voltage under special forced oscillation and generalized forced oscillation are studied. It is found that when the periodic disturbance induces a special forced oscillation, the voltage fluctuation has the same mode information compared to the power angle fluctuation. And it also has obvious peak characteristics near the natural frequency. When the stochastic disturbance induces generalized forced oscillation, the voltage fluctuations can be decomposed into proportional and resonant components according to its frequency domain characteristic. Finally, the above conclusions are verified by the simulation results of an IEEE 4-generator 2-area system.

中文翻译：

---

随机功率干扰的互联电网动态电压波动机理分析

随着大规模可再生能源和各种新型负载的整合，电力的随机波动特性严重影响了互联电网的安全稳定运行。除了过去研究过的交流联络线的有功功率波动外，总线电压的动态波动问题也日益突出。首先，介绍了现代电力系统中电力铁路牵引负荷，冶炼负荷和风力发电的典型功率波动，并分析了伴随的电压波动。其次，研究了特殊强迫振荡和广义强迫振荡下系统电压的动态波动机理和分布特性。可以发现，当周期性扰动引起特殊的强迫振荡时，电压波动与功率角波动相比具有相同的模式信息。并且在自然频率附近也具有明显的峰值特性。当随机扰动引起广义强迫振荡时，电压波动可以根据其频域特性分解为比例分量和谐振分量。最后，以上结论得到了IEEE 4-gener 2-area系统仿真结果的验证。根据其频域特性，可以将电压波动分解为比例分量和谐振分量。最后，以上结论得到了IEEE 4-gener 2-area系统仿真结果的验证。根据其频域特性，可以将电压波动分解为比例分量和谐振分量。最后，以上结论得到了IEEE 4-gener 2-area系统仿真结果的验证。