微网中光伏发电系统的储能控制研究

Energy Storage Control for the Photovoltaic Generation System in a Micro-Grid

利用可再生能源(如太阳能和风能)的分布式发电,其输出是典型的不稳定,这些不稳定的输出对现有的电力系统产生负面影响。为了减少负面影响,需要控制在微网中的各个分布式电源的输出。设计了一种基于蓄电池储能的并网光伏发电系统结构,结合功率流动的控制策略介绍了各部分的运行原理,对系统能流模型进行了详细分析,根据电池的特性设计了充放电的控制策略。在PSCAD平台下对设计的模型进行仿真,通过在不同能流模型下控制策略仿真分析,验证所提出储能方案的正确合理性,对功率平衡起到很好的调节作用。

Distributed generation （DG） that uses renewable energy sources （such as solar and wind） has an unstable output which can negatively affect existing electric power systems. In order to reduce the negative impacts as mentioned above, we need to control the output of each individual DG installed in a micro-grid. This paper designs a grid-connected Photovoltaic（PV） system based on battery for storing energy. First, the paper introduces the operation principle of the various parts with the control strategy of the power flow. Second, it analyzes the model of energy flow of the system in detail, and finally, with the battery as the energy storage device, it designs the charge-discharge control strategy according to the characteristics of the battery. The feasibility of the energy storage control strategy is verified through the simulation models built based on the PSCAD/EMTDC platform. Through analyzing the control strategy simulation of different power flow models, the paper verifies the correctness and rationality of the proposed storage scheme.