用于平抑风电波动功率的混合储能系统及其控制系统

摘要

The output power of a wind power system is with intermittence and randomness, so it will seriously have impacts on power quality when the system was connected into power grid. This paper raised a new type of hybrid energy storage system based on super-capacitor and storage battery, so as to meet the demand of balance and inhibition of wind power in lfuctuation. The useful life of the system was prolonged by controlling the processes of charging and discharging for hybrid energy storage system and the charging and discharging efifciency were improved. Via decomposition of wind power lfuctuation, a new type of control model was adopted to set up a power informa-tion data bank. According to the real-time wind power and energy storage elements state, the information data bank was searched to get the relevant control algorithm method. The multi-lfuctuation power control plan of wind power system was simpliifed, to have shortened control time. Simulation result shows that the raised hybrid energy storage system and its control plan are feasible and the output power of wind power can meet real-time dispatch requirements of power system after balanced and inhibited.%风电系统输出功率具有波动性和随机性，并网时将严重影响电能质量。提出了一种基于超级电容器和蓄电池的新型混合储能系统，以满足平抑风电波动功率的需求。通过对混合储能系统充放电过程的控制，延长系统的使用寿命，提高充放电效率。对风电波动功率进行分解，通过采用一种新型的控制模型，建立功率信息库，根据实时风电功率及储能元件的状态，检索信息库，得到充放电控制器相应的控制算法，简化了风力发电系统多种波动功率的控制方案，缩短控制时间。仿真结果表明，所提出的混合储能系统及其控制方案是可行的，平抑后的风电输出功率可以满足电力系统实时调度的要求。