含大規(guī)模風電的互聯(lián)電網(wǎng)頻率控制策略研究
[Abstract]:With the development of social modernization, energy crisis and environmental pollution bring more challenges to the sustainable development of society. Therefore, the development and utilization of new energy is highly valued by all countries in the world. Wind power plays an important role in the field of renewable energy because of its abundant resources, large-scale development and relatively short construction period. However, the increase of wind power grid capacity brings new problems and challenges to the frequency stability control of power system, which affects the safe and stable operation of the system. The study of frequency control strategy for interconnected power system with large scale wind power has become an important research topic in frequency stability control of power system. Therefore, focusing on the frequency control problem of interconnected power grid with wind power, the paper studies the active participation of wind turbine in frequency modulation system and the improvement of load frequency control in interconnected power grid. The main work of this paper is as follows: (1) aiming at the inherent shortcoming of speed recovery of doubly-fed wind turbine after releasing rotor kinetic energy in traditional rotor kinetic energy control, an improved frequency control scheme for doubly-fed wind turbine based on rotor kinetic energy control is designed. The proposed improved scheme can realize the active control of rotor speed recovery start-up time. By controlling the frequency drop process caused by speed recovery, the frequency recovery will occur after the stability of the rotor speed is restored. To overcome the adverse effect on frequency control caused by releasing rotor kinetic energy and entering the speed recovery process immediately. Simulation results show that the proposed method can effectively improve the effect of active participation of doubly-fed wind turbines in system frequency modulation. (2) in order to improve the design of integer order PID load frequency controller for wind power access, A load frequency controller based on fractional-order PID is designed for interconnected wind power network. Particle swarm optimization (PSO) algorithm is used to optimize the parameters of the controller. The simulation results show that the controller has good dynamic performance and anti-interference ability. Compared with integer order PID load frequency controller, fractional order PID load frequency controller can better deal with the nonlinearity and uncertainty in load frequency control. Fractional PID load frequency controller can effectively reduce the adverse effect of wind power output uncertainty on frequency control of interconnected power grid. It provides a new solution for load frequency control of interconnected power grid with wind power. (3) in order to improve the anti-parameter perturbation ability of load frequency controller, a load frequency controller based on sliding mode control is designed. The simulation results show that the load frequency controller based on sliding mode control has better control performance than the integer order PID load frequency controller, and can better solve the load frequency control problem of interconnected power grid with wind power. Compared with fractional PID load frequency controller, the load frequency controller based on sliding mode control has better resistance to parameter perturbation. The theoretical research and simulation results show that the frequency control strategy of interconnected power grid with wind power is reasonable and effective from the aspects of active participation of wind turbine in system frequency modulation and improvement of load frequency control method. It is beneficial to improve the frequency stability control ability of the wind power interconnected power network, and can provide a strong guarantee for the safe and stable operation of the wind power interconnected power network.
【學位授予單位】:西南交通大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM614;TM712
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