基于多電池儲(chǔ)能系統(tǒng)的微網(wǎng)離網(wǎng)控制技術(shù)研究
[Abstract]:Energy storage system is an important part of microgrid. It can be used in microgrid to cut peak and fill valley, to improve power quality, to improve stability of new energy supply, and to improve reserve power supply, especially when power supply network at higher level breaks down. When the microgrid is running on an island, the energy storage system can supply power to the load in the microgrid. The parallel / off-grid control strategy of the energy storage system is the key to realize these functions, and with the increase of the micro-grid load, it is necessary to further study the control mode of parallel operation of several energy storage systems. In order to ensure the stable operation of isolated islands, this paper focuses on the parallel operation control of multi-computers without interconnected communication lines in the off-grid of energy storage system. In view of the reasonable power allocation mechanism of multi-machine parallel connection in energy storage system, a method of proportional power allocation based on droop control is proposed, and the influence of closed-loop parameters on droop control strategy is deeply studied. A reasonable method of selecting sag coefficient and lead impedance is put forward. The simulation results show that the proposed method can distribute power according to the requirement when the energy storage system is connected in parallel. In view of the line impedance difference, by introducing virtual impedance compensation, the current sharing control of energy storage system with parallel operation is realized. At the same time, a secondary frequency modulation method is proposed, when the frequency of off-grid operation of energy storage system exceeds the limit. It is restored to the allowable range by the second frequency modulation. Aiming at the defects of droop control, the virtual synchronous machine control of energy storage system is designed, and the influence of control parameters of virtual synchronous machine on the control is deeply studied. At the same time, the stability analysis of small disturbance based on virtual synchronous machine control is carried out. The stability of the control strategy of the virtual synchronous machine and the influence of control parameters on the stability of the system are verified. A self-tuning inertia parameter control method is proposed to solve the problem of parallel current sharing of virtual synchronous machines. The feasibility of the control algorithm is verified by simulation. Finally, the off-grid control experiment of energy storage system is carried out based on the hardware in loop experiment platform. The feasibility of the hardware control system of the converter of the energy storage system is verified by the hardware-in-loop experiment, and the effectiveness of the proposed control method is further verified.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM727
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