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Abstract
Wind energy, as a kind of renewable natural energy, is spread all over the world. It is one of the most widely used and promising green energy to adjust the energy structure. Therefore, wind energy conversion systems (WECSs) have captured a great deal of attention in renewable energy sources for the past few years. In order to improve the transient stability and deal with non-linearity, variable parameters, strong coupling, and multi-variables an linear active disturbance rejection control with correction link (LADRC-CL) strategy is proposed for the WECS based on the permanent magnet synchronous generator (PMSG). The LADRC-CL completes with a conventional PD control rule, the linear extended state observer (LESO) and a correction link. Its convergence, stability and disturbance rejection ability were analyzed in frequency domain. Furthermore, the mathematical model of the WECS is analyzed and part of the model information is written into the LESO matrix to effectively reduce the LESO observation burden. In an experiment, the control performance of the LADRC-CL was also tested under various operating conditions using the 3.6MW power unit full true wind field simulation experiment platform to verify the correctness, validity and reliability of the linear active disturbance rejection control with correction link.
Highlights
With the progress of the economy and the increase of the demand for electric energy, more and more distributed energies are connected to the power grid such as wind energy conversion systems (WECSs), photovoltaic power generation and super-capacitor [1], [2]
A linear active disturbance rejection controller (LADRC)-CL control system was implemented for the analysis of three different cases of grid-side and machine-side fault, as follows: (1) At t = 2 s, voltage symmetry fault occurred in the power grid, and the drop depth was 10%, which returned to normal after 0.5 seconds
The LADRC-CL and PI controller were separately implemented in the WECS
Summary
With the progress of the economy and the increase of the demand for electric energy, more and more distributed energies are connected to the power grid such as WECS, photovoltaic power generation and super-capacitor [1], [2]. The WECS, which uses the kinetic energy of the wind to generate electricity, is of utmost importance in these methods. The associate editor coordinating the review of this manuscript and approving it for publication was Huiping Li. used a full power converter structure to completely isolate the wind generator from the power grid, resulting in its fault crossing (FRT) capability far superior to WECS based on DFIG. Most wind farms adopt the WECS based on PMSG. In order to meet the power quality demand, it is required that the WECS can keep connected to the grid under a certain degree of grid voltage fluctuation
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