Synergetic control based on rotor speed regulation with variable proportional coefficient for doubly-fed wind turbines implementing virtual inertia support
Synergetic control based on rotor speed regulation with variable proportional coefficient for doubly-fed wind turbines implementing virtual inertia support
- Author(s): Kai Liang ; Xiaotao Peng ; Jicheng Zhou ; Ruiming Wang ; Fucheng Li
- DOI: 10.1049/cp.2019.0368
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- Author(s): Kai Liang ; Xiaotao Peng ; Jicheng Zhou ; Ruiming Wang ; Fucheng Li Source: 8th Renewable Power Generation Conference (RPG 2019), 2019 page (8 pp.)
- Conference: 8th Renewable Power Generation Conference (RPG 2019)
- DOI: 10.1049/cp.2019.0368
- ISBN: 978-1-83953-125-5
- Location: Shanghai, China
- Conference date: 24-25 Oct. 2019
- Format: PDF
Due to the rotor side converter of doubly-fed induction generator based on wind turbine (DFIG-WT) decouples its rotor kinetic energy to the grid frequency, the DFIG-WT has no ability to provide inertial support for the grid frequency disturbance. In this paper, the feasibility analysis for DFIGWT providing frequency inertial support based on rotor speed control is discussed at first. Then, via analyzing the rotor speed control mechanism of DFIG-WT, a frequency support control based on variable proportional coefficient is proposed. At the same time, the synergetic control theory is adopted to design the control strategy of the variable proportion coefficient. Based on setting up the macro variable which is composed of grid frequency, the virtual inertia time constant and the increment of stator active power, the control law of the variable proportion coefficient can be derived through designing the dynamic characteristic of the macro variable to satisfy the first order inertia. The synergetic control will make the virtual inertia of DFIG vary with frequency, and it has better frequency regulation performance than traditional virtual inertia control. Finally, based on the simulation in WSCC 9-bus wind power system, the effectiveness of the proposed synergetic control strategy of virtual inertial is verified. The simulation results show that the proposed control strategy has the advantage on adaptively regulating the variable proportion coefficient for implementing the DFIG-WTs with different operation state to coordinately provide the frequency support.
Inspec keywords: wind power; power grids; power system stability; power generation control; asynchronous generators; velocity control; frequency control; wind turbines; wind power plants; rotors; stators; machine control
Subjects: Control of electric power systems; Power system control; Asynchronous machines; Frequency control; Wind power plants; Velocity, acceleration and rotation control
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