Design of a novel hybrid control for permanent magnet synchronous generator-based wind energy conversion system

With the ever-increasing permeation of wind energy into electrical grids, the low operating efficiency and poor stability seem to become major challenges for the power industry because of the stochastic characteristic of wind speeds. Aiming at these problems, this article designs a novel hybrid control method for a permanent magnet synchronous generator-based wind energy conversion system. A port-controlled Hamiltonian with dissipation model is proposed to apply in the models of the machine and grid-side converters of the permanent magnet synchronous generator-based wind energy conversion system. Then, this port-controlled Hamiltonian with dissipation model is used to the energy shaping method of interconnection and damping assignment. The hybrid control strategy, containing the outer-loop proportional-integral control and inner-loop passivity-based control, is finally designed in this article. To achieve the analysis, a Simulink model of the 1.5 MW permanent magnet synchronous generator-based wind energy conversion system is established under various types of wind speeds. A comparative analysis between the proposed hybrid control strategy and conventional proportional-integral vector control is conducted through the electrical behaviors and the harmonic distortion rates. The simulation results verify that the hybrid control strategy has better regulation performance than that of conventional proportional-integral control strategy in terms of maintaining at optimal state and improving system stability. It is also demonstrated that the proposed control strategy optimizes the quality of supplied power, which is of significance to reduce the harmonic pollution of wind energy.

Automated summary

This article proposes a novel hybrid control method for a permanent magnet synchronous generator-based wind energy conversion system to address the challenges of low operating efficiency and poor stability caused by the stochastic characteristic of wind speeds. By introducing a port-controlled Hamiltonian with dissipation model and energy shaping method, the hybrid control strategy, including outer-loop proportional-integral control and inner-loop passivity-based control, is designed to improve system stability and regulation performance. Simulation results demonstrate that the proposed control strategy optimizes the quality of supplied power and outperforms conventional proportional-integral control in maintaining optimal state and reducing harmonic pollution in wind energy.