| Citation: | LI Shancheng, WANG Yong, ZHONG Wencheng, et al. PI decoupling control method of turboprop engine based on model reference adaptive compensation[J]. Journal of Aerospace Power, 2025, 40（1）：20220434 doi: 10.13224/j.cnki.jasp.20220434
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In view of the problem that the conventional PI decoupling control method of turboprop engine has insufficient robustness in the whole envelope, a PI decoupling control method based on model reference adaptive compensation was proposed. Based on the rotor dynamics and order characteristics of turboprop engine, a method to obtain the transfer function matrix of turboprop engine was also proposed. On this basis, combined with the zero pole elimination method, the decoupling link and double loop PI controller were designed respectively. By establishing the expected state space equation of the closed-loop system, a model reference adaptive compensation method was designed to effectively improve the robust performance of the controller. In addition, in order to further improve the dynamic tracking performance of the control method, a fast adaptive law based on adaptive rate covariance adjustment was adopted. Based on the nonlinear simulation model of turboprop engine, simulation verification of the control method was carried out. The results showed that at different flight envelope points, compared with the conventional PI decoupling controller, the PI decoupling control method based on model reference adaptive compensation can shorten the maximum regulation time of gas turbine speed by about 15%, reduce the overshoot by more than 90%, and cut down the maximum overshoot or droop of power turbine speed by more than 60%. It exhibited higher dynamic control effect, superior robustness and disturbance rejection ability.
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