基于变系数PI控制的双馈风电机组自适应转速恢复策略

doi:10.19595/j.cnki.1000-6753.tces.220852

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Abstract Doubly-fed induction generator (DFIG) participates in frequency regulation to support the reduced system inertia. After frequency regulation, the rotor speed is lower than the optimal speed. It is necessary to regain the rotor speed, otherwise, the rate of wind energy utilization would be reduced, or stalling of DFIG even be caused. The existing rotor speed recovery methods only unilaterally improved the performance of speed recovery or reduced the size of frequency secondary drop. To address these issues, this paper suggests a variable-coefficient-PI-control speed recovery strategy.
Firstly, this paper revealed the influence mechanism of the amount of the active power reduction and the invitation of the recovery strategy on the frequency secondary drop and the speed recovery performance; secondly, a recovery strategy of the DFIG based on fixed-PI-coefficient control was proposed, the reduction output power with “rise after restrain” manner had been preliminarily constructed to speed recovery. Then, to solve the shortcomings of the recovery strategy with fixed-PI-coefficient, this paper established the coupling relationship between rotor speed of the doubly-fed induction generators and PI control coefficients according to different operating conditions, and then constructed an adaptive recovery strategy based on variable-PI-coefficient to ensure the speed recovery performance while suppressing the frequency secondary drop. Finally, power system model with various wind power penetrations and disturbances was modeled based on an EMTP-RV to investigate the effectiveness of the proposed rotor speed recovery strategy.
Simulation results on the different speed recovery strategies illustrate that, under the disturbance of 90 MW with the wind power penetration of 20%, since the DFIG directly removed the frequency support control strategy, it caused a sudden power change of 0.116(pu) so as to result in a frequency secondary drop of 49.69 Hz; the DFIG absorbed more kinetic energy during the short period, the rotor speed regained to the initial value at 95 s; when the DFIG used the fixed-coefficient-PI-control speed recovery strategy, the sudden power variation was reduced by 0.082(pu), the frequency secondary nadir was improved by 0.030 Hz, however, the time for the speed recovery was extended to 120 s; the use of variable-coefficient-PI-control speed recovery strategy started speed recovery without sudden power variation, as a result, no frequency secondary drop was caused, the amount of the active power reduction increase leaded to faster speed recovery during the latter period. When the disturbances increased to 150 MW, the variable-PI-coefficient speed recovery strategy could still maintain the better speed recovery performance and avoid secondary frequency drop. In the case of a large disturbance with a high wind penetration level, the frequency secondary drops for the direct rotor speed recovery and fixed-PI-coefficient speed recovery strategy were lower than the first frequency nadir caused by the disturbance, however, the variable-PI-coefficient speed recovery strategy could guarantee the speed recovery performance without causing a second frequency drop.
The following conclusions can be drawn from the simulation analysis: (1) In specific cases, the fixed-coefficient-PI-control speed recovery strategy can preliminarily constructed the “rise after restrain” manner of the active power reduction so as to mitigate the size of frequency secondary drop and ensure speed recovery performance by reasonably employing the parameters of PI controller. (2) The proposed variable-coefficient-PI-control speed recovery strategy can achieve the counterbalance between frequency secondary dip and rotor speed recovery performance compared to constant- coefficient-PI-control speed recovery strategy since the reduction output power with “rise after restrain” manner had been constructed to during the rotor speed recovery period.

Key words： Doubly-fed induction generator (DFIG) adaptive rotor speed recovery frequency secondary drop PI control

Received: 18 May 2022

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TM614

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Wang Xin,Yang Dejian. Adaptive Speed Recovery Strategy of Doubly-Fed Induction Generator Based on Variable PI Control Coefficient[J]. Transactions of China Electrotechnical Society, 2023, 38(15): 4120-4129.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220852 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I15/4120

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