Abstract

This paper studies the sliding mode control of regulating system of pumped storage power station (PSPS) considering nonlinear pump-turbine characteristics (NPTC). Firstly, the mathematical model of regulating system of PSPS considering NPTC is established. Then, the sliding mode control strategy (SMCS) of regulating system of PSPS is designed. The regulation quality of regulating system of PSPS under SMCS is illuminated by comparing with that of regulating system of PSPS without SMCS. The effect of gain matrix of SMCS on the dynamic performance of regulating system of PSPS is revealed. Finally, the robustness of regulating system of PSPS under SMCS is revealed. The results indicate that the proportional and integral sliding mode surface can satisfy the objective of sliding mode control of regulating system of PSPS. The SMCS can effectively eliminate the chaos phenomenon and improve the regulation quality of regulating system of PSPS considering NPTC. Under the effect of SMCS, the regulating system of PSPS enters the stable state and arrives the target state rapidly. After the introduction of SMCS, the maximum of settling time of regulating system is decreased from 20.78 s to 2.76 s. The pole assignment has a significant influence on the convergence rate and settling time of the dynamic response processes of state variables. The robustness of the regulating system of PSPS under SMCS is much better than that of the regulating system of PSPS without SMCS. After the introduction of SMCS, the value of robustness index for the regulating system is decreased from about 0.2 to about 0.004. The anti-interference performance of regulating system of PSPS considering NPTC is improved significantly.

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