基于MATLAB的电力系统黑启动发电机自励磁仿真研究

Simulation of Generator's Self-excitation in Power System Black Start Based on MATLAB

随着电力系统规模和容量的逐渐增大,对系统的供电安全也提出了更高的要求。研究整个电力系统在故障停运后的恢复问题,制定可行的黑启动方案对保证系统安全运行具有重要意义。黑启动过程中有可能发生的机组自励磁问题是决定黑启动恢复方案是否可行的关键因素之一。简述了同步发电机产生自励磁现象的基本原理,导出实用的工程判据,及基于MATLAB设计实现的自励磁仿真系统。这一系统既可独立完成自励磁现象的建模仿真,也可与黑启动决策支持系统等外部应用程序集成使用,极大地简化了恢复方案制定过程中的校验计算。结合实例给出的仿真波形,证明了这一方法的有效性。

With the scale of the power system enlarging and the capacity increasing,more strict requirements for power supplying safety are proposed.Black start,the restoration of power system after blackout due to certain faults,is important to ensure the system secure.Whether the generator's self-excitation takes place during black start is a key factor for determining feasibility of restoration schemes.In this paper,criterions are given after the fundamental of generator's self-excitation is introduced and a simulation system based on MATLAB is designed.The system not only could perform modeling and simulation for generator's self-excitation,but also could be integrated into black start decision support system.As a result,the process of preparing restoration schemes is simplified consi-derably.The simulation waves of the typical example show that the idea of the paper is effective.