Research on the side converter system of wind power grid based on fractional LCL filter

The power electronic converters and grid-connected filters were important components of the permanent magnet direct drive wind generation system whose performance directly determines quality generation. In past modeling, analysis, control studies, capacitive inductive often treated as integral-order components. However, inductance capacitance in actual generator fractional-order components, their electrical characteristics will change with order, which had an impact on dynamic static system. this paper, mathematical model LCL (FOLCL) filter was derived. Through simulation, it could be seen that FOLCL can avoid resonance fundamentally. At same time, PI (FOPI) controller introduced into machine-side current converter, parameters FOPI outer speed loop inner adjusted by using time-domain optimization method. results showed efficiency significantly better than integer-order realizing maximum energy capture. It provides theoretical support practical application value for stable operation