分布式发电微网系统暂态时域仿真方法研究——(三)算例实现与仿真验证

摘要

为验证分布式发电系统暂态仿真算法的正确性和有效性,通过选取典型的分布式电源及相应的控制策略,实现了包括光伏发电单元、固体氧化物燃料电池发电单元、微型燃气轮机发电单元及蓄电池储能单元在内的各种分布式发电系统的建模与暂态仿真,考察了在欧盟典型低压微网系统结构下,微网从并网状态切换到孤岛状态时系统的暂态过程,详细比较了TSDG与MATLAB/SimPowerSystems的仿真结果.仿真结果表明TSDG与MATLAB/SimPowerSystems计算误差不超过0.1％,具有良好的数值精度与数值稳定性.伪牛顿法对程序仿真计算速度具有较大幅度的提升.讨论了未来通过并行思想、多速率算法等方式提高程序计算性能的思路.%Typical DGs and corresponding control strategies are selected for validating the correctness and effectiveness of transient simulation algorithm for DG system. Different DG systems are modeled and simulated,including PV,SOFC,microturbine and battery. The transients from grid-connected mode to islanded mode are investigated for typical European low-voltage microgrid and the simulative results are compared in detail between TSDG and MATLAB/SimPowerSystems,which shows the maximum relative error is less than 0.1%,proving the high numerical accuracy and numerical stability of TSDG. The application of pseudo Newton method enhances the calculation speed. The concepts of parallel processing and multi-rate algorithm to improve the calculation performance in future work are discussed.