储能系统双向Buck-Boost变换器控制策略研究

为应对可再生能源出力波动引起储能系统功率流动方向的频繁变化，提出一种基于自抗扰控制和模型预测控制（ADRC+MPC）的储能系统双向Buck-Boost变换器控制策略。其中模型预测控制方法应用于电流内环，无需进行参数整定的同时，也提高了系统的响应速度；采用自抗扰控制策略的电压外环，通过在高频段降阶简化控制对象，达到降低自抗扰控制器复杂度的目的。仿真和样机实验显示当电感电流与输出电压参考值突变时，系统可分别在0.2与30 ms内迅速调整到给定值；当负载与电源电压突变时，系统能在20 ms内恢复稳定。实验结果证明该文提出的控制方法优于PI+MPC策略，具有响应速度快、超调量和波动幅度小的特点。

RESEARCH ON CONTROL STRATEGY OF BIDIRECTIONAL BUCK-BOOST CONVERTER IN ENERGY STORAGE SYSTEM

The wide application of energy storage system helps to improve the absorption capacity of renewable energy uhder high penetration rate. For restraining output fluctuations of renewable energy source and responding frequent changes in flow direction of energy storage system, a control strategy of bidirectional DC-DC converter in energy storage system based on active disturbance rejection control （ADRC） and model predictive control （MPC） is proposed. The current inner loop adopts a MPC method, which improves the response speed and does not require parameter tuning. The voltage outer loop adopts a reduced-order control strategy based on ADRC, which reduces the order of control object in the high frequency band and reduces the complexity of the controller. Simulation and experiment show that when inductor current and output voltage reference value change suddenly, system can quickly adjust to the given value within 0.2 ms and 30 ms respectively; when load and power supply voltage change suddenly, system can recover stability within 20 ms. The results verify that the method proposed in this paper has characteristics of fast response, small overshoot and fluctuation range in the adjustment process, which is superior to PI+MPC strategy.