含不同微源接口的微網(wǎng)建模及穩(wěn)定性分析
[Abstract]:With the development of large power grid and distributed generation technology, microgrid has become a research hotspot because of its many advantages. There are great differences between microgrid and traditional large power grid, mainly reflected in the microgrid with more kinds of micro-sources. The development of microgrid technology can not be separated from advanced control strategies. The modeling and stability analysis of microgrid is the theoretical basis of microgrid controller design and control strategy optimization. It is of great significance to study the modeling and stability of microgrid. In this paper, the microsource is divided into synchronous generator, asynchronous generator and inverter interface according to the different microsource interface. In order to analyze the interaction between the three kinds of microsources and the influence of the coexistence of multi-type microsources on the stability of microgrid, a synchronous generator is derived in this paper. The small disturbance stability analysis model of three typical interface microsources of asynchronous generator and voltage source inverter is presented and the nine order microgrid small disturbance model is deduced by network coordinate transformation. In order to analyze the influence of system parameters on the small disturbance stability of microgrid under different control strategies, two control strategies, PQ and PV, are proposed and their small disturbance models are derived in detail. Furthermore, the extended small disturbance model of microgrid with multi-synchronous generator, multi-asynchronous generator and multi-inverter interface microsource is proposed. The eigenvalues of microgrid are calculated and analyzed under two operating conditions by programming in Matlab. Finally, by calculating the sensitivity of system dominant characteristic root to different parameters, the stability of microgrid under PQ and PV control strategy is analyzed and compared, and the conclusion that can provide decision basis for microgrid control is obtained.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TM711
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