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A design scheme of hydraulic wind turbine with multi-accumulator is presented to smooth the output power. The mathematical models of the impeller, hydraulic pump, hydraulic motor, conventional accumulator, controllable accumulator control, and constant speed control in the system are established respectively. The AMESim simulation models of the system are also established. Under the stable wind speed condition, the characteristics of impeller torque, hydraulic drive and conventional accumulator are studied. Under the turbulent wind speed condition, the characteristics of controllable accumulator are analyzed, and the system characteristics with and without controllable accumulator are compared. The results show that when the wind speed is stable, only the conventional accumulator works, which can stabilize the power output effectively. When the wind speed changes sharply, the controllable accumulator opens intermittently. It stores energy as the wind speed increases rapidly and releases energy for the system as the wind speed drops suddenly. The application of the multi-accumulator effectively reduces the torque fluctuation of generator, increases the system stability, and improves the quality of power generation.
Chengbing He; Jianchong Wang; Runze Wang; Xiaoxiang Zhang. Research on the characteristics of hydraulic wind turbine with multi-accumulator. Renewable Energy 2021, 168, 1177 -1188.
AMA StyleChengbing He, Jianchong Wang, Runze Wang, Xiaoxiang Zhang. Research on the characteristics of hydraulic wind turbine with multi-accumulator. Renewable Energy. 2021; 168 ():1177-1188.
Chicago/Turabian StyleChengbing He; Jianchong Wang; Runze Wang; Xiaoxiang Zhang. 2021. "Research on the characteristics of hydraulic wind turbine with multi-accumulator." Renewable Energy 168, no. : 1177-1188.
Series capacitor compensation is used to improve the utilization of existing power systems. Subsynchronous resonance (SSR) can be caused by series compensated lines, which would lead to turbogenerator shaft breakdown. A novel approach was presented in this paper to analyze the characteristics and influence factors of SSR in a series compensated transmission system. The system model of SSR, including the various modules of the electromechanical network, was established, and the eigenvalue results under 70% series compensation level were analyzed by eigenvalue analysis method for the the institute of electrical and electronics engineers (IEEE) first benchmark model (FBM). Compared with the results of the power systems computer-aided design (PSCAD) modeling and simulation, the effectiveness of eigenvalue analysis method was proven. After that, the eigenvalue analysis method was used to study, in detail, the effects of system series compensation levels, synchronous generator parameters, speed governing system parameters, and excitation system parameters on SSR characteristics. The research results show that the series compensation level has the greatest influence on the torsional mode damping of the system. The parameters of generator reactance, speed governing system, and excitation system have some effect on the torsional mode damping. The parameters of excitation system significantly affect the low-frequency oscillation damping.
Chengbing He; Dakang Sun; Lei Song; Li Ma. Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System. Energies 2019, 12, 3282 .
AMA StyleChengbing He, Dakang Sun, Lei Song, Li Ma. Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System. Energies. 2019; 12 (17):3282.
Chicago/Turabian StyleChengbing He; Dakang Sun; Lei Song; Li Ma. 2019. "Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System." Energies 12, no. 17: 3282.