Overall Adaptive Controller Design of PMSG Under Whole Wind Speed Range: A Perturbation Compensation Based Approach

Abstract

This paper proposes an adaptive overall control strategy of the permanent magnet synchronous generator-based wind energy conversion system (WECS) in the whole wind speed range. For the machine side, the maximum power point tracking (MPPT) operation is realized by stator current and mechanical rotation speed control under below-rated wind speeds. Under above-rated wind speeds, the extracted wind power is limited via pitch control. For the grid side, the reactive and active power injected into grid is regulated by DC-Link voltage and grid current control loop. In addition, under grid voltage dips, the pitch control is employed for limiting grid current and maintaining the DC-Link voltage around its rated value. The fault ride-through capability (FRTC) can be enhanced. The overall control strategy is based on perturbation estimation technique. A designed observer is used for estimating the perturbation term including all system nonlinearities, uncertainties and disturbances, so as to compensate the real perturbation. Then, an adaptive control for the original nonlinear system can be realized. The effectiveness of the proposed overall control strategy is verified by applying the strategy to a 2-MW WECS in MATLAB/Simulink. The results show that, compared with the feedback linearizing control (FLC) strategy and conventional vector control (VC) strategy, the proposed perturbation observer based adaptive control (PO-AC) strategy realizes the control objectives without knowing full state information and accurate system model, and improves the robustness of the WECS parameter uncertainties and FRTC.

Switching‐angle‐based hybrid modulation method of full wind speed and low carrier wave ratio for direct‐drive permanent‐magnet wind power generation system

“…And when the wind speed fluctuates up and down at the switching point, it cause frequent switching of the control modes, which would cause oscillation of the unit and affect the safety and reliability. The literature [7] proposes an adaptive overall control strategy for a permanent‐magnet synchronous generator (PMSG)‐based wind energy conversion system (WECS) over the entire wind speed range, which achieves the control objective without knowledge of the complete state information and accurate system model. However, this control strategy required the addition of new observers, making the system more complex.…”

Disturbance-Suppression Method of Direct-Driven PMSG-Based Wind Power System in Microgrids

“…A model predictive controller design method is proposed for Maximum Power Point Tracking (MPPT) systems based on the DPMSG [12]. The adaptive overall control in the whole wind speed range increases the robustness of the DPMSG-based WPS [13]. The modeling and control methods of the DPMSG-based WPS are compared and analyzed, and the direction of future research is demonstrated in [14].…”

Solar PV Sustained Quasi Z-Source Network-Based Unified Power Quality Conditioner for Enhancement of Power Quality

“…This DC voltage control system for the DC-link requires voltage sensors to obtain information about the voltage. Energy storage units, such as condensers and batteries, are used to manage the load when a tension and disturbance emerges [9][10][11]. The use of these energy storage units restricts the unified power quality conditioner's (UPQC's) ability to compensate because energy storage capacities are limited.…”