基于模糊逻辑的变电站蓄电池远程充放电控制研究

Study on Remote Charging and Discharging Control of Substation Batteries Based on Fuzzy Logic

针对现有的控制方法蓄电池输出有功功率达不到需求,负荷变化后波动较大的问题,研究基于模糊逻辑的变电站蓄电池远程充放电控制。确定区间二型模糊逻辑的输出区间,定义参数矩阵。将所得隶属度进行笛卡尔运算,按照一定的指数规律调整控制变量的加权系数,确定参数矩阵中的具体参数,得到控制变化量加权系数之间的关系。设计模糊控制器,将数据转换成模糊变量。计算电池荷电状态,建立模糊规则表,通过比较不同结果动态调整单体电池的充放电过程达到控制目的。实验结果表明,在负荷较小的工况下,实验组将输出有功功率调节到了有功功率需求值40 MW,并维持较为平稳的状态,没有波动产生;在负荷较大的工况下,实验组的曲线在负荷变化后波动不大,经过控制转换后,蓄电池的输出功率达到输出功率需求值,使得结果符合预期,维持微网电能质量。

In view of the problems such as inadequate reactive power output and large fluctuation under varying load of the existing battery control methods,a remote charging and discharging control of substation batteries based on fuzzy logic is studied.The output interval of interval type II fuzzy logic is determined and the parameter matrix is defined.Cartesian operation is performed on the obtained membership degree and the weighting coefficient of the control variable is adjusted according to a certain exponential law to determine the specific parameters in the parameter matrix and obtain the relationship between the weighting coefficients of the control change.A fuzzy controller is designed to convert data into fuzzy variables.A fuzzy rule table is established by calculating battery′s state of charge,and charging and discharging processes of a single battery can thereby be dynamically adjusted by comparing different results to achieve control purposes.The experimental results indicate that under low load conditions,the experimental group adjusts the output active power to the required active power value of 40 MW and maintains a relatively stable state without any fluctuations.Under high load conditions,the curve of the experimental group shows unobvious fluctuation after load changes.The control conversion makes the output power of the battery reach the required output power value,making the results meet expectations and maintaining the power quality of the microgrid.