基于電力電子變壓器的能量路由器拓?fù)渑c控制策略研究
[Abstract]:Distributed energy operation is limited to natural conditions, power generation is intermittent, a large number of distributed energy access will make the network produce two-way power flow. The traditional single centralized power generation is gradually changing to centralized, distributed and co-existing generation mode, and the one-way flow of electric energy is becoming multi-directional flow mode. The traditional distribution operation mode of power system is difficult to meet such complex requirements. The power electronic transformer is designed for AC / DC hybrid microgrid as the common connection point, and its topology, control and operation characteristics are studied, so as to give full play to the functions of electrical isolation and active power control of power electronic transformer. To provide multi-voltage level AC / DC interface and reduce power grid harmonics is helpful to the development of new energy industry and is of great significance to the development of AC / DC hybrid microgrid and even energy Internet. In order to determine the topology of power electronic transformer designed for AC / DC hybrid microgrid and realize energy router, according to the existing research on energy Internet, energy router and power electronic transformer, The multi-module cascade topology structure is selected, and a more flexible double active bridge based on phase shift control is adopted, and then the input cascade H bridge structure is determined, and the independent IBDC. is used in the middle stage. After the topology is determined, the hybrid modulation strategy is adopted in the input stage, which combines the advantages of PWM and the nearest level approximation, reduces the synchronization requirements of the connected units at all levels, and is beneficial to the realization of power equilibrium control. The middle stage adopts phase shift control mode, which can control the voltage and current of the original secondary side to achieve the purpose of energy bidirectional control. At the same time, the modal analysis of voltage reversal phenomenon in the operation of intermediate stage DC-DC is carried out in detail, and the matching relationship between excitation inductance and dead time is put forward. The theory is verified by simulation and experiment. On the basis of theoretical research, a prototype of single-phase 380V/300V cascade multi-level power electronic transformer is developed, the design idea of experimental platform and control circuit is given, and the reliability of each part of PET is verified respectively. At the same time, the selected parameter design method and the proposed control method are verified by experiments. Finally, the disturbance rejection test is carried out for the prototype. The results show that the energy router based on power electronic transformer can meet the objectives of voltage isolation, energy active bidirectional control and harmonic control. It can run stably and reliably for a long time, and can resist the interference of voltage fluctuation on the network side.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TK01;TM41
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