并网光伏发电系统的通用性机电暂态模型及其与电磁暂态模型的对比分析

Comparative study on electromechanical and electromagnetic transient model for grid-connected photovoltaic power system

针对并网光伏发电系统电磁暂态模型复杂、计算速度慢的问题,提出了一种并网光伏发电系统的通用性机电暂态模型。该模型不包含电器元件及高频开关器件,由纯粹的数学计算完成,模型简单、计算速度快。在PSCAD/EMTDC中对该机电暂态模型进行了仿真,得到的结果与电磁暂态模型的仿真结果吻合,且仿真时间大大减少,从而验证了该机电暂态模型的正确性及有效性。该通用性机电暂态模型为大规模并网光伏电站的仿真建模等提供了模型参考,具有实用价值。

The computing speed of electromagnetic transient model for grid-connected photovoltaic power system is very slow because of its complexity. To solve this problem, a general electromechanical transient model for grid-connected photovoltaic power system is proposed, in which there are not electrical components and high frequency switching device, and it only consists of pure mathematic calculations, is simple and has fast calculation speed. By comparing the simulation results of this electromechanical transient model with electromagnetic transient model in PSCAD/EMTDC, we found that the simulation time is reduced greatly and the results are agreeable basically, which verifies the correctness and validity of the electromechanical transient model. The electromechanical transient model provides reference model for simulation and modeling of large scale grid-connected photovoltaic power station and is of great practical value.