Abstract
In order to solve the large-scale grid-connected photovoltaic cells caused by power fluctuations, power quality decline and other issues. This paper proposes and researches a power coordination control strategy for microgrid based on photovoltaic power generation. The principle of photovoltaic cells and the switching of maximum power point tracking and limited power mode are studied. The stability control methods of DC bus voltage, AC bus wire and frequency are studied. The model of microgrid is established and moreover, based on the power of microgrid and the charging state of storage battery, the operation of microgrid is divided into different working modes. The stable operation of microgrid is realized by adjusting the output power of each unit in different working modes. The calculation shows that the control strategy can effectively reduce the power fluctuation in the microgrid and improve the output power of renewable energy. Finally, the feasibility and effectiveness of the proposed methods are verified by experiments.
Highlights
Due to the global energy over-consumption and environmental pollution are becoming more and more serious, the renewability and non-pollution of solar power let it be favored by social development
The large-scale use of photovoltaic cells can cope with the energy crisis, because of its own intermittent shortcomings of power generation, when grid-connected, it will cause power fluctuation and reduce power quality, limit power generation, while the proposal of microgrid proposes to solve such problems
Microgrid can be divided into DC microgrid, AC microgrid and AC-DC hybrid microgrid according to different forms of electric energy[2,3]
Summary
Due to the global energy over-consumption and environmental pollution are becoming more and more serious, the renewability and non-pollution of solar power let it be favored by social development. AC-DC hybrid microgrid has AC bus bar and DC bus bar, which can provide electric energy for AC load and DC load at the same time It omits multiple power conversion links, simplifies microgrid structure and distributed power supply mode, and improves operation efficiency and economy. Reference[9] considers the power control strategy of DC microgrid and divides DC microgrid into four working modes based on power It does not consider the shortage of photovoltaic power supply. Considering the limitation of energy storage capacity, mode switching of photovoltaic power generation units and combined power supply of diesel generators, this paper proposes a power coordination control strategy under islanding mode of AC/DC hybrid microgrid. Based on the system power and the state of charge (SOC) of storage battery, this method determines the different working modes of each module in the microgrid under different operating conditions, and realizes the coordinated power control of the microgrid based on photovoltaic power generation
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