State Space Averaging Modeling and Analysis of Disturbance Injection Method of MPPT for Small Wind Turbine Generating Systems

Based on a configuration with low cost and high reliability, disturbance injection method is employed to achieve the maximum power point tracking (MPPT) for the small wind turbine generating systems(SWTGS) in this paper. State space averaging method is used to model the whole system, and its nonlinear and linearization model are given. The choosing principle of two crucial parameters of disturbance magnitude d_m and angular frequency omega are proposed by the frequency response analysis of the system. Experiment results show that the modeling of SWTGS and theoretical analysis of disturbance injection method of MPPT are correct and practical. Results obtained in the paper lay the foundation for the application of disturbance injection method of MPPT to SWTGS, and have theoretical significance and practical value in engineering.