Li Boxi, Yu Chang, Lu Xiaoqing, Wang Fanrong
Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, PR China.
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, PR China.
ISA Trans. 2023 Oct;141:351-364. doi: 10.1016/j.isatra.2023.07.008. Epub 2023 Jul 11.
Battery energy storage systems (BESSs) are generally used as a buffer stage for photovoltaic (PV) power generation to tolerate the output power unpredictability in DC microgrids, in which the State-of-Charge (SoC) balance is a necessary and urgent issue to be solved. To this end, an integral feedforward sliding mode controller (SMC) is adopted to replace the traditionally proportional integral (PI) controller such that the voltage response speed of the converter in each BESS can be significantly enhanced. Further, a novel adaptive droop control strategy for SoC balance with three different working modes is proposed, in which all batteries can be cooperated through three different stages corresponding to their different SoC degrees. Compared with most existing SoC balancing approaches, the proposed SoC strategy can improve the transient performance for the BESSs and their robustness against the volatility of PV output powers. The effectiveness of the proposed SoC balancing strategy is verified through a simulation in a DC microgrid network consisting of several PV generators, batteries, and loads utilizing Simulink/SimPower Systems.
电池储能系统（BESSs）通常用作光伏发电的缓冲阶段，以承受直流微电网中输出功率的不可预测性，其中荷电状态（SoC）平衡是一个亟待解决的问题。为此，采用积分前馈滑模控制器（SMC）取代传统的比例积分（PI）控制器，从而显著提高每个BESS中变换器的电压响应速度。此外，提出了一种具有三种不同工作模式的用于SoC平衡的新型自适应下垂控制策略，其中所有电池可通过与其不同SoC程度相对应的三个不同阶段进行协同。与大多数现有的SoC平衡方法相比，所提出的SoC策略可改善BESSs的暂态性能及其对光伏输出功率波动的鲁棒性。通过在由多个光伏发电机、电池和负载组成的直流微电网网络中利用Simulink/SimPower Systems进行的仿真，验证了所提出的SoC平衡策略的有效性。
