Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity-Based Con
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ORIGINAL ARTICLE
Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity‑Based Controller Under Unbalanced Grid Voltage Conditions Qiming Cheng1 · Xinqiao Ma1 · Yinman Cheng2 Received: 30 December 2019 / Revised: 2 June 2020 / Accepted: 8 July 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In order to solve the problem of excessive damage to doubly fed induction generator (DFIG) system under the condition of unbalanced voltage, this paper presents an improved coordinated control strategy based on doubly-fed induction generator (DFIG) wind power system, which can solve these problems well. The innovation of this paper is that the parallel grid-side converter (PGSC) uses a passivity-based controller (PBC) based on the Port Control Hamiltonian Dissipation (PCHD) model. Not only can four different control goals be achieved, namely, constant voltage of DC bus voltage, grid-side active power without second harmonics, grid-side reactive power without second harmonics, and grid-side current without negative sequence component, but also to ensure that the balance of stator and rotor current without distortion, the DFIG output power and electromagnetic torque without pulsation. The proposed coordinated control strategy has the characteristics of not changing the control strategy of the rotor-side converter and avoiding complex high-order matrix. The experimental results on the software platform and the hardware platform show that the proposed coordinated control strategy has the advantages of fast response, strong anti-interference ability, high stability, less control parameters. Keywords Doubly fed induction generator (DFIG) · Unbalanced voltage · Coordinated control · Series grid-side converter (SGSC) · Passivity-based controller (PBC)
1 Introduction With the increasing impact of wind turbines for power system stability, it is necessary to ensure that the wind turbine can be effectively connected to the grid and provide reactive power under unbalanced voltage condition. Nowadays, doubly fed induction generator (DFIG) is widely used in many wind turbines because of its own advantages [1, 2]. However, when the power grid fails, the DFIG system will * Xinqiao Ma [email protected] Qiming Cheng [email protected] Yinman Cheng [email protected] 1
College of Automation Engineering, Shanghai University of Electric Power, Shanghai, China
College of Electronics and Information Engineering, Tongji University, Shanghai, China
2
be severely affected because the stator is directly connected to the power grid [3]. At the same time, for the rotor winding of DFIG, the negative sequence voltage has a larger slip, which will cause the rotor over-voltage and over-current [4, 5]. Since the existence of negative sequence components, it will cause the stator current unbalanced and the low harmonic current of the rotor current. And, it will also cause the active power, reactive power, electromagnetic torque and DC bus voltage to generate second harm
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