摘要
针对三相级联并网逆变器输出电流谐波少且可直接用于高电压大功率场合的特点,提出一种可用于此拓扑结构的改进型有限集模型预测控制(finite control set-model predictive control,FCS-MPC)策略。与传统的脉冲宽度调制(pulse width modulation,PWM)、载波相移正弦波脉宽调制(carrier phase shifted sinusoidal pulse width modulation,CPS-SPWM)相比,该方案省去了调制器且易实现并网控制;与传统的模型预测控制算法相比,该方案加入了电流反馈补偿环节、计算延时补偿环节、电压电流参考值修正环节,并通过优化被控对象减少运算量。仿真和实验结果表明,采用改进的有限集模型预测控制方案不仅是可行和有效的,而且具有方法简单、总谐波畸变率(total harmonics distortion,THD)小等优势。
Few output current harmonics is one of characteristics of three-phase cascade grid inverter applied in high voltage and power occasions. An improved FCS-MPC algorithm used in the cascade inverter is proposed. Compared with PWM and CPS-SPWM, modulator is neglected in the new scheme and current control of grid connection is easily implemented. Compared with traditional MPC algorithm, links of feedback compensation, calculation time delay compensation and reference correction are added in the proposed strategy. According to characteristics of controlled objects, calculation burden is greatly decreased. Simulation and experiment results show that the method is feasible and effective with lower total harmonic distortion.
出处
《电网技术》
EI
CSCD
北大核心
2017年第1期245-250,共6页
Power System Technology
关键词
三相级联
并网逆变器
有限集模型预测控制
three-phase cascade
grid inverter
finite control set-model predictive control（FCS-MPC）
