Method for islanding microgrid control and optimization based on rotating coordinate virtual impedance
A technology of virtual impedance and rotating coordinates, which is applied in the field of microgrid to achieve power decoupling, improve accuracy, and improve impedance characteristics
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[0034] The present invention will be further described below in conjunction with accompanying drawings and examples.
[0035] figure 1 It is a schematic diagram of a typical microgrid structure, which includes three typical distributed power sources (DG1-DG3) of wind turbines, photovoltaic cells, and fuel cells, and three loads in different positions. The impedance of each line is z 1 -z 5 . In this paper, each distributed power source is assumed to be a DC source or a rectified DC source, which is converted into a three-phase AC by the SVPWM inverter and filtered by an LCL low-pass filter, and then connected in parallel to the AC of the microgrid. It is connected to the main grid at the point of common connection PCC through a static transfer switch. figure 2Thevenin equivalent circuit for distributed generation connected to microgrid AC bus. In the figure, E∠φ is the open circuit voltage of the inverter, U∠0 is the AC bus voltage, Z and θ are the amplitude and phase an...
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