基于反馈线性化鲁棒控制μ方法的准开关升压型逆变器光伏并网策略

Research on grid-connected control for the quasi-switched boost inverter of photovoltaic system based on feedback linearization and μ-synthesis method

与Z源逆变器相比,准开关升压型逆变器降低了电路体积及成本,更适用于光伏并网系统。将光伏并网系统中的不确定性考虑在内,提出一种基于反馈线性化鲁棒控制μ方法的准开关升压型逆变器光伏并网策略。利用反馈线性化方法建立准开关升压型逆变器逆变侧的仿射线性数学模型,并采用μ方法设计控制器K。仿真结果表明,在外界条件变化时,具有较好的动态性能,能够迅速恢复稳态,且始终保持着较高的功率因数;在参数变化时,对并网质量影响较小。

Compared with the Z source inverter, the circuit cost of the quasi switching boost inverter is greatly reduced. Therefore, it is more suitable for photovoltaic grid connected system. Research on grid-connected control for the quasi-switched boost inverter of photovoltaic system based on feedback linearization and μ-synthesis method is proposed when the uncertainty of the grid connected photovoltaic system is considered. Using feedback linearization method establishes the mathematical model of the inverter side. The controller K is designed by μ-synthesis method. The method is simulated and verified. It has better dynamic performance when the external conditions are changed. And it can quickly restore the steady state and maintain a high power factor. When the parameter changes, it has less influence on the quality of grid connection. This work is supported by Natural Science Foundation of Shanghai （No. 13ZR1417800） and National Natural Science Foundation of China （No. 51405286）, Shanghai Key Technologies R ＆ D Program （No. 14110500700）, and Key Laboratory for Substation Automatic Technique of Shanghai （No. 13DZ2273800）.