光伏发电输电变换器优化控制仿真研究  

Research on Optimized Control of Transmission Convertor of Photovoltaic Power Generation

作　　者：孟丙清 佃松宜[1] 蒲明[1] 

机构地区：[1]四川大学电气信息学院,四川成都610065

出　　处：《计算机仿真》2016年第4期150-154,160,共6页Computer Simulation

基　　金：四川省高校院所应用成果转化项目计划(12DXYB171JH-002)

摘　　要：DC-DC开关功率变换器作为光伏发电前端关键环节,其性能对于光伏电池最大功率的跟踪,工作效率的提高有着很重要的意义。传统控制多采用连续控制方式设计复杂,搭建模拟电路实现困难,适用范围窄。针对上述难点问题,在传统快速终端滑模基础上作改进,提出了一种适用于数字控制的新型幂次型快速离散终端滑模。选择对数函数和幂次项构造分段滑模面,证明了其滑模运动收敛速度在任意点均快于快速离散终端滑模。将提出的离散控制方案应用于Buck变换器,理论分析与仿真均表明,幂次型快速终离散端滑模控制方法在加快系统误差轨迹收敛速度、增强鲁棒性、减小稳态误差等方面均有显著改善。可为光伏发电前端DC-DC开关功率变换器的优化控制提供参考。The existing continuous control method has the shortcomings of designing complexity and narrow applicable range, and it is difficult to build the analog circuits. Aiming at these difficult problems, a new power - type fast discrete - time terminal sliding mode was put forward based on fast terminal sliding mode control. A logarithmic function and a power function were chosen for constructing a piece wise sliding mode surface. It was proved that its convergence speed is faster than fast discrete -time terminal sliding mode control in arbitrary point. Then, the discrete -time control strategy was applied to buck converter. Theoretical analysis and simulation results show that the system performance under power - type fast discrete -time terminal sliding mode control is significantly improved in accelerating system error track convergence speed, which enhances the robustness and decreasing steady - state error. It can provide a reference for optimal control of photovoltaic power generation front - end DC - DC switching power converter.

关 键 词：光伏发电 开关功率变换器 幂次型快速离散终端滑模 数字控制 鲁棒性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]