Method for controlling small disturbance voltage stability of microgrid system

Abstract

The invention relates to a method for controlling the small disturbance voltage stability of a microgrid system. The microgrid system controlled by the method comprises a photovoltaic power source, adiesel generator and a DFIG that are connected to one end of a 10kV bus. The control method includes the following steps of: 1) state variable acquisition, including the acquisition of a photovoltaicpower source state variable, the acquisition of a diesel generator state variable, and the acquisition of a DFIG state variable; 2) characteristic value calculation including combining the photovoltaic power source state variable, the diesel generator state variable, and the DFIG state variable to construct a system state space model and to obtain the characteristic value of a system state matrix;3) specific parameter determination including combining the acquired characteristic value and the change trend of a voltage dynamic response curve at a PCC point, and determining the specific parameter affecting the small disturbance voltage stability; and 4) voltage control including improving the specific parameter to improve the small disturbance voltage stability. Compared with the prior art,the method is simple and visual, reduced in cost, and high in control efficiency.

Description

technical field [0001] The invention relates to the field of micro-grid system voltage control, in particular to a control method for small-disturbance voltage stability of the micro-grid system. Background technique [0002] Under the dual pressure of energy demand and environmental protection, the international community has turned more attention to the technical field of distributed power generation that can not only improve the efficiency of traditional energy utilization but also make full use of various renewable energy sources. Microgrid technology is an effective way to exert the efficiency of distributed power generation, and it has important economic significance and social value. When the microgrid is connected to the grid, the voltage is supported by the external large power grid, and the island operation can only be regulated and controlled by the internal distributed power supply. Therefore, the research on the voltage control of micro-sources in the microgrid ...

AI Technical Summary

Problems solved by technology

However, most of the current research on voltage stability with small disturbances is only for a single generator or wind turbine, and there is no specific research method for microgrid systems; In the research method, all micro-sources participate in tie-line power control and voltage-frequency control. This control method is complex and inefficient, which increases the cost of system control.

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