光储系统直流母线电压与超级电容荷电管理控制

光储并网系统中, 针对电压源型换流器(VSC)中外环直流母线电压无静差控制, 提出改进型PI控制方法.根据超级电容荷电状态(SOCsc)提出基于交互控制及限值管理混合储能系统二次功率分配控制策略. 临界充放电模式下, 引入虚拟修正电流的概念, 根据超级电容分配功率的正负及交互速率因子确定虚拟修正电流的大小, 使SOCsc向稳定的区间变化; 极限充放电模式下, 对SOCsc进行限制管理, 避免其过充过放现象. 通过算例分析, 验证了所提改进型PI控制策略的优越性; 并基于获得的SOCsc进行二次功率分配, 控制其荷电状态(SOC)运行于相对稳定工作区间.

DC bus voltage and super capacitor charge management control in optical storage system

In optical storage grid connected system, an improved PI control method is proposed to control the outer loop DC bus voltage of voltage source converter (VSC). According to the super capacitor state of charge (SOCsc), the secondary power distribution control strategy based on interactive control and limit management is proposed. Under the critical charge and discharge mode, the concept of virtual correction current is introduced, and the size of the current value is determined through the positive and negative distribution power of the super capacitor and the interaction rate factor, so as to change the SOCsc in a stable range. Under the limit charge and discharge mode, SOCsc shall be limited and managed to avoid overcharge and discharge. Through the example analysis, the superiority of the proposed improved PI control strategy is verified. Based on the obtained SOCsc, the secondary power is distributed to control its state of charge (SOC) to operate in a relatively stable working range.