电压不平衡下并网逆变器的模型预测功率解耦控制  

Model Predictive Power Decoupling Control of Grid-connected Inverter Under Voltage Imbalance

作　　者：舒涛 董学育 朱建忠[1] SHU Tao;DONG Xueyu;ZHU Jianzhong(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211100,China)

机构地区：[1]南京工程学院电力工程学院,南京211100

出　　处：《电力系统及其自动化学报》2025年第4期150-158,共9页Proceedings of the CSU-EPSA

摘　　要：针对不平衡电网电压条件下并网逆变器的模型预测直接功率控制的功率耦合问题,提出一种基于动态前馈功率补偿的功率解耦策略。首先采用新定义的无功功率搭建并网逆变器模型预测直接功率控制的数学模型,不需要进行不平衡电压的正负序提取,在代价函数中使用新定义无功功率,得到正弦的并网电流,并有效消除由不平衡电网电压产生的输出功率2倍基频振荡;然后根据功率误差和电流偏差的关系设计补偿功率,将补偿功率前馈到逆变器功率控制回路,实现良好的解耦性能。最后搭建基于MATLAB/Simulink平台的仿真模型,验证所提策略的有效性。A power decoupling strategy based on dynamic feed-forward power compensation is proposed to solve the power coupling problem in the model predictive direct power control of grid-connected inverters under unbalanced grid voltage conditions.First,the newly defined reactive power is used to build the mathematical model of a grid-connected inverter under the model predictive direct power control without the positive-or negative-sequence extraction of unbal-anced voltage,and the sinusoidal grid-connected current is obtained by using the new definition of reactive power in the cost function,so that the 2-fold fundamental frequency oscillation of output power generated by the unbalanced grid voltage is effectively eliminated.Then,the compensation power is designed according to the relationship between power error and current deviation,which is fed forward to the inverter power control loop to achieve a good decoupling perfor-mance.Finally,a simulation model based on the MATLAB/Simulink platform is constructed to verify the effectiveness of the proposed strategy.

关 键 词：不平衡电网电压 模型预测直接功率控制 前馈功率补偿 功率解耦 

分 类 号：TM464[电气工程—电器]