带混合储能的微网并网控制策略研究

摘要

The uncertainty of new energy power generation has seriously affected the stability of power system.Using a single battery energy storage is diffcult to possess high power density,high efficiency,no pollution and other advantages.In order to overcome the disadvantages of battery energy storage,a hybrid energy storage system is composed of a battery and a super capacitor in this paper.The system power fluctuation is divided into high and low frequency by using the high pass filter.The high frequency part is directly absorbed or released by the super capacitor,and the low frequency part together with the remaining capacity of the battery and the super capacitor are used as the input of the fuzzy controller.Through the establishment of fuzzy rules,the sharing coefficient of the super capacitor to the low frequency power component is solved.Then calculate the capacity of the battery and the super capacitor to the system power.Building the simulation and experiment platform,results show that this control strategy makes full use of the capacity of the super capacitor,and the whole micro network system can operate stably and efficiently.%新能源发电的不确定性严重影响了电力系统的稳定.采用蓄电池单一储能的方式很难具有高功率密度、高效率、无污染等优点.为了克服蓄电池储能的缺点,文章将蓄电池和超级电容组成昆合储能单元,利用高通滤波器将微网系统功率波动分为高、低频两部分,高频部分由超级电容直接吸收或释放,而低频功率分量与蓄电池、超级电容的剩余容量一起作为模糊控制器的输入,通过模糊规则的建立,求解出超级电容对低频功率分量的分担系数,进而计算出蓄电池和超级电容对系统功率的分担量.搭建仿真与实验平台,结果表明该控制策略充分利用了超级电容的容量,且能使整个微网系统高效稳定地运行.