DFIG Sub-Synchronous Oscillation Suppression Strategy Based on Backstepping Adaptive Quasi-Resonant Control
Sun Dongyang1, Meng Fanyi1, Wang Nan2, Jin Ningzhi1, Cai Wei1
1. College of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin 150080 China; 2. College of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China
Abstract：With the continuous expansion of the capacity and scale of power system, the series compensation capacitor is often adopted to improve the transmission capacity of the line, but this aggravates the risk of sub-synchronous oscillation in the system. The power grid sub-synchronous oscillation will affect the control of the rotor side converter (RSC) of doubly fed induction generator (DFIG), and then cause the oscillation divergence of stator current, and in severe cases, the wind turbine will be disconnected from the grid. To solve the problem that the sub-synchronous oscillation of the power grid interferes with the control of the RSC of the DFIG, which leads to the distortion of DFIG stator current, this paper adopts the RSC backstepping sub-synchronous oscillation suppression strategy based on adaptive quasi-resonant control to maintain the stable output of DFIG stator current. The propagation mechanism of power grid sub-synchronous oscillation in RSC is firstly studied, and the propagation path of oscillation signal in RSC control system is determined by establishing the RSC mathematical model under the power grid sub-synchronous oscillation, and the calculation formula of sub-synchronous component of DFIG stator current is obtained. Secondly, the corresponding backstepping controller is designed based on the RSC decoupling model and the Lyapunov stability function to simplify the RSC control system and reduce the power grid sub-synchronous oscillation transmission path. At the same time, considering the failure of the oscillation suppression strategy when the power grid sub-synchronous oscillation frequency changes, this paper proposes to use an adaptive quasi-resonant controller to track and control the sub-synchronous components of different frequencies in the DFIG stator current. The backstepping controller and the adaptive quasi-resonant controller control the fundamental and sub-synchronous components of the DFIG stator current respectively, so as to suppress the sub-synchronous current at different frequencies in the DFIG stator, so as to avoid the power generation system output being affected by power grid sub-synchronous oscillation. Finally, the simulation model and experimental platform of DFIG system under sub-synchronous oscillation frequency change are built to simulate the sub-synchronous oscillation of power grid with different frequencies, and the inhibition effect of DFIG stator oscillation current when using quasi-resonant control and adaptive quasi-resonant control is verified respectively. Simulation results show that the backstepping controller can realize the decoupling control of DFIG output power under steady state conditions, and the adaptive quasi-resonant controller can suppress the sub-synchronous component of stator current in a wider frequency range than the quasi-resonant controller. The experimental results show that when the parameters of the quasi-resonant controller are determined, the sub-synchronous oscillations in the DFIG system can only be suppressed within a specific frequency range, while the adaptive quasi-resonant controller can suppress the sub-synchronous oscillations in the DFIG system over a wide band range. The mechanism analysis and suppression strategy of sub-synchronous oscillation proposed in this paper can be further extended to the stability research of grid side converter and phase locked loop under sub-synchronous oscillation of power grid.
孙东阳, 孟繁易, 王南, 金宁治, 蔡蔚. 基于反步自适应准谐振控制的双馈风机次同步振荡抑制策略[J]. 电工技术学报, 2023, 38(9): 2375-2390.
Sun Dongyang, Meng Fanyi, Wang Nan, Jin Ningzhi, Cai Wei. DFIG Sub-Synchronous Oscillation Suppression Strategy Based on Backstepping Adaptive Quasi-Resonant Control. Transactions of China Electrotechnical Society, 2023, 38(9): 2375-2390.
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2023, Vol. 38 
