基于定频MPC的飞跨电容储能双向直流变换器低频波动功率抑制策略  

Low-frequency fluctuation power of a flying capacitor energy storage bidirectional DC converter based on a fixed frequency MPC

作　　者：樊启高[1] 陈亮 毕恺韬 艾建 FAN Qigao;CHEN Liang;BI Kaitao;AI Jian(School of Internet of Things Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214122

出　　处：《电力系统保护与控制》2023年第21期1-11,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51807079);江苏省自然科学基金项目资助(BK20200623);博士后科学基金项目资助(2020M681692)。

摘　　要：为抑制直流母线低频波动功率对储能系统的影响,以飞跨电容双向直流变换器为研究对象,提出基于单目标定频模型预测控制(model predictive control,MPC)低频波动功率抑制策略。为降低传统MPC算法的运算负荷,通过对变换器数学模型进行分析,提出一种单目标定频MPC控制算法。该算法仅需通过电感电流单目标约束函数,即可实现对系统电流及双端飞跨电容电压的控制,无须对两端飞跨电容电压进行独立寻优,极大地降低了计算量。为实现对储能系统低频波动功率的抑制,引入低频波动功率抑制算法,通过与所提MPC算法的融合,使最终控制方案能够在实现储能控制目标的前提下,具备低频波动功率抑制能力,且保持良好的动态性能。通过搭建小功率实验平台对所提控制策略的有效性进行了验证。To suppress the influence of low-frequency fluctuating power of a DC bus on an energy storage system,a low-frequency fluctuating power suppression strategy based on single-objective fixed-frequency model predictive control(MPC)is proposed.A flying capacitor bidirectional DC converter is the research object.To reduce the computational load of a traditional MPC algorithm,a single-objective fixed-frequency MPC control algorithm is proposed by analyzing the mathematical model of the converter.It can control the system current and the voltage of the two-terminal flying capacitor only through the single-objective constraint function of the inductor current,without independent optimization of the voltage of the two-terminal flying capacitor.In this way it greatly reduces the amount of calculation.In order to suppress the low-frequency fluctuating power of the energy storage system,a low-frequency fluctuating power suppression algorithm is introduced.Through the integration with the proposed MPC algorithm,the final control scheme can have the capability of suppressing the low-frequency fluctuating power and keep good dynamic performance while realizing the energy storage control goal.The proposed control strategy is verified by building a low-power experimental platform.

关 键 词：飞跨电容双向直流变换器 储能系统 模型预测 低频波动功率抑制 单目标约束 

分 类 号：TM46[电气工程—电器]