基于模型预测控制的不平衡电网电压下三相燃料电池并网发电系统功率解耦控制策略  

Power decoupling control strategy for three-phase grid-tied fuel cell system under unbalanced grid voltages with improved model predictive control

作　　者：李周华 陈迟 刘斌[1] Li Zhouhua;Chen Chi;Liu Bin(School of Electric Power Engineering,Guangxi University,Nanning 530000,China;Beijing ZSBoFang Intelligent Technology Co.,Ltd.,Beijing 100022,China)

机构地区：[1]广西大学电气工程学院,广西南宁530000 [2]北京中盛博方智能技术有限公司,北京100022

出　　处：《可再生能源》2023年第11期1504-1511,共8页Renewable Energy Resources

基　　金：国家自然科学基金项目(62141103)。

摘　　要：当三相电网电压不平衡时,由于直流-交流功率耦合,质子交换膜燃料电池(PEMFC)的输出电流会产生低频电流脉动,影响其输出性能和使用寿命。此外,功率耦合将导致交流侧的并网电流畸变。文章提出了一种功率解耦控制策略,以消除燃料电池输出电流脉动,同时降低并网电流的总谐波畸变率(THD)。DC-DC变换器和DC-AC逆变器分别由基于虚拟矢量和最优占空比的改进模型预测控制(MPC)算法控制,通过改进的MPC方法,可实现对参考电流的精确跟踪,并获得良好的鲁棒性和暂态性能。最后,仿真结果验证了所提功率解耦控制策略的有效性。Under unbalanced grid voltages,the output current of proton exchange membrane fuel cell(PEMFC)will have low-frequency current pulsation,due to the DC-AC power coupling.The current ripples will affect the output and service life of the PEMFC,besides,power coupling can lead to current distortion in the AC grid side.To this end,a new power decoupling control strategy is proposed to eliminate the output current oscillation of fuel cell and reduce the total harmonic distortion(THD)of the grid current.The DC-DC converter and the DC-AC inverter are controlled by the improved model predictive control(MPC)algorithm with virtual-vectors and optimal duty cycle,respectively.With the improved MPC methods,excellent tracking accuracy of reference current,robustness and transient performance can be obtained.Finally,the effectiveness of the proposed power decoupling control strategy is verified by the simulation results.

关 键 词：电网电压不平衡 质子交换膜燃料电池 电流脉动 总谐波畸变率 改进的MPC算法 

分 类 号：TK51[动力工程及工程热物理—热能工程]