Abstract
The hybrid microgrid can make full use of the distributed generation to supplement the large power grid, but different power sources need to be coordinated before supplying more stable power. This study proposed an improved coordinated control strategy for the heterogeneous power in the hybrid microgrid. In this strategy, the reference power of the gas turbine was calculated by the predictive algorithm instead of the traditional reference power calculation method. Then, the simulation experiment was carried out. The results show that the micro gas turbine would provide the power when the photovoltaic output power was insufficient to bear the local load due to the decrease of light intensity, and the gas turbine under the improved control strategy was faster; the distribution network bus caused by the sudden change of illumination had smaller voltage fluctuation and shorter duration under the improved coordinated control strategy; the fifth and seventh harmonics generated by the voltage fluctuation were smaller under the improved strategy.
Highlights
The power supply of the traditional power grid system is in the form of single centralization; once there is a problem in some areas, it will affect the stability of the whole power grid
Even if there is a problem in the distributed power grid, it can be disconnected in time to ensure the stability of the main grid
The distributed grid can flexibly add microgrid at the edge to reduce the feeder loss at the edge of the grid, and this kind of power supply form is quite suitable for the existing renewable energy, such as photovoltaic power generation, wind power generation, etc
Summary
The power supply of the traditional power grid system is in the form of single centralization; once there is a problem in some areas, it will affect the stability of the whole power grid. The distributed grid can flexibly add microgrid at the edge to reduce the feeder loss at the edge of the grid, and this kind of power supply form is quite suitable for the existing renewable energy, such as photovoltaic power generation, wind power generation, etc. Zhou et al [5] proposed a microgrid cluster structure and its autonomous coordinated control strategy and verified through the simulation and actual hardware experiment that the control strategy could effectively stabilize the microgrid. This paper proposed an improved coordinated control strategy for the heterogeneous power in the hybrid microgrid. In this strategy, the reference power of the gas turbine was calculated by the predictive algorithm instead of the traditional reference power calculation method.
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