基于时序模拟的并网型微网可靠性分析

摘要

With the independent networking and autonomous operation characteristics of the grid connected microgrid, the internal important load can be supplied to short-term continuous power effectively. Firstly, This paper analyses random output characteristic of the photovoltaic power and wind turbine in microgrid , and proposes a coordination strategy based on parallel operation of microgrid and the extranet , and the whole time sequence reliability model for isolated island operation is built based on the two kinds of running modes of the grid connected microgrid. Secondly, according to the isolated island operating features and load removal principle, a new reliable index is introduced to assess the continuous power supply capacity of the microgrid. Finally , a reliability evaluation algorithm is proposed based on the random and sequential characteristics of microgrid ,and taking the improved RBTS BUS6 system for example to improve the traditional sequential Monte Carlo method ,and the calculation simulation is demonstrated the practicability of the proposed method. Based on the research above, the influence of the power supply location and storage capacity on the reliability of the distribution system is analyzed with changing the power supply location and the storage capacity of the microgrid.%并网型微网凭借独立组网、高度自治的特点，可有效保证内部重要负荷的短期持续供电。首先，分析了微网中光伏电源和风电机组的输出随机特性，针对并网型微网两种运行方式，提出并网运行时微网和外网输出协调工作策略，并建立了孤岛运行时全时序可靠性模型；其次，基于孤岛运行特征和负荷切除原则，提出新的评估微网持续供电能力的可靠性指标；最后，对传统时序蒙特卡罗法进行改进，提出基于微网随机、时序等运行特性的可靠性评估方法，并以RBTS BUS6改进系统为例进行了仿真计算，验证所提方法的可行性。在此基础上，通过改变微网内电源的位置和储能容量大小，分析了电源位置和储能容量对配电系统和微网可靠性的影响。