海洋孤島微電網(wǎng)協(xié)調(diào)控制策略研究
[Abstract]:Because the traditional continental power grid to the island has the characteristics of long transmission line, high cost and low reliability, and there are abundant renewable resources on the island, one of the important measures to promote the stable development of the island economy is to establish a stable and reliable island microgrid. In order to realize the safe, stable and economical operation of island microgrid, and aiming at the problems of distributed power generation unit, the specific research contents of this paper are as follows: firstly, this paper introduces the research status of microgrid, takes the island as the research object, then deeply studies the photovoltaic power generation system, and carries on the mathematical modeling. In order to solve the problem that the load impedance can only be converted in one direction when the maximum power point tracking (MPPT) is carried out by using DC/DC method, the improved particle swarm optimization algorithm is used for MPPT control, and the simulation results are verified by simulation. Secondly, the wind power generation system is studied, the typical wind power generation form is understood, and the original wind turbine in Tuoji Island is improved. When the wind speed exceeds the rated wind speed, the pitch angle control strategy is used in order to keep the output power of the unit near the rated power quickly. The simulation results show that the control effect of this method is good. Because photovoltaic, wind power and other power generation units have the characteristics of randomness and intermittent, it is easy to cause the instability of DC bus voltage. On the basis of adopting the double energy storage control strategy of battery and supercapacitor, a method of maintaining DC bus voltage stability is proposed, which can keep the DC bus voltage stable, and at the same time, it can restrain the fluctuation of DC bus voltage quickly. Finally, the grid-connected inverter is studied. Aiming at the great influence of grid-connected harmonics on power quality, a compound control method of PDFI (proportional delay feedback integral) control and fuzzy control is proposed, which can not only suppress the harmonics of power grid, but also track the reference current of grid-connected quickly and accurately. Simulation results show that this method has good control effect and effectively improves power quality.
【學(xué)位授予單位】:江蘇科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM727
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