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| Stability Analysis and Stability Condition of Parameters of Deloaded Wind Turbine Generator with Pitch Angle Reserve Based on Damping Torque Method |
| Ao Boyu1, Jing Zhibin2, Li Hongbo2, Chen Lei1,3, Min Yong1,3 |
1. Department of Electrical Engineering Tsinghua University Beijing 100084 China;
2. Power Dispatching and Control Center Inner Mongolia Power (Group) Co. Ltd Hohhot 010090 China;
3. State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 China |
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Abstract Reserve capacity through variable pitch deloading is an important technical solution for variable speed wind turbines to participate in frequency regulation. However, improper parameter settings may cause wind turbines to oscillate or even become unstable. The stability of the variable pitch deloading frequency regulation wind turbine was analyzed in this scenario. So the parameter stability conditions with analytical expressions were derived, and when the control parameters meet the proposed constraints, the stability of the frequency regulation wind turbine can be guaranteed.
Firstly, This article establishes a frequency regulation model for wind turbines and simulates the scenario of wind turbine oscillation under unreasonable wind turbine parameters. Then, the stability of the variable pitch deloading frequency regulation wind turbine was analyzed in this scenario, and the dynamic equation of the unit was linearized. Based on the damping torque method, the damping torque of each part of the electromagnetic power and mechanical power of the wind turbine, as well as the influence of different factors, were analyzed. The damping torque generated by pitch angle control was emphasized, and the negative damping torque generated by pitch angle control when the parameters were inappropriate was the main reason for the instability of the wind power system.
This article validates the electromagnetic transient model of a doubly-fed induction generator (DFIG) on the RT-Lab real-time simulation platform. The wind turbine was simulated and verified at 8.501 0 m/s and 7.501 0 m/s, respectively. To verify the effectiveness of the damping torque method, the parameters of the pitch angle controller were changed to make the damping torque coefficients negative, close to zero, and positive, respectively. The simulation results are consistent with the analysis results of the damping torque method. On the basis of verifying the effectiveness of the damping torque method, verify the stability conclusions of the reference power strategy and the variable reference power strategy mentioned in the paper. Under wind speeds of 8.501 0 m/s and 7.501 0 m/s, tests were conducted in scenarios with both fixed reference power strategy and variable reference power strategy. The results showed that using the variable reference power strategy is more conducive to the stability of the wind turbine, consistent with the previous theoretical analysis. In addition, to verify the effectiveness of the stability conditions of the pitch angle controller parameters, under the variable reference power strategy, the parameters of the pitch angle controller were fixed under different operating conditions, and three different sets of pitch angle time constants were set. The corresponding critical values were calculated using the parameter stability conditions proposed. The results indicate that under the set parameters, the equilibrium point is a stable equilibrium point, and the units are stable. The proposed parameter stability conditions are effective.
The following conclusions can be drawn from the simulation analysis: (1) It is found that adopting a variable baseline power strategy would be more beneficial for the stability of the wind turbine. (2) Mechanical power damping is affected by the damping generated by pitch angle control, and is influenced by three parameters of the pitch angle controller. Among them, the larger the delay of pitch angle action, the more likely the wind power system is to be unstable; Increasing the proportional coefficient or decreasing the integral coefficient is beneficial for the stability of the wind power system. (3) Furthermore, analytical stability conditions for wind turbine control parameters isderived. When the control parameters meet the proposed constraints, the stability of the frequency regulation wind turbine can be guaranteed.
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Received: 08 December 2024
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2026, Vol. 41 
