Micro-grid small signal stability analytical method

Abstract

The invention belongs to the research field of micro-grid application, and relates to a micro-grid small signal stability analytical method, in particular to a small disturbance stability analytical method used for selecting a network equation type according to micro-grid line voltage classes in order to establish a system state space model. In accordance with a micro-grid typical line 400V and 10kV, a circuit type is selected first, then different network equations are chosen according to the two sorts of voltage classes so that the system state space model can be established, in this way, small signal stability analysis is conducted, the conditions of droop gain change, load change, line impedance change and the like can be analyzed, and thus a basis can be provided for stability control over the micro-grid.

Description

technical field [0001] The invention belongs to the field of microgrid application research, and in particular relates to a microgrid small signal stability analysis method. Background technique [0002] As a small new energy power generation system, the microgrid has attracted more and more attention because of its convenience, high efficiency, and cleanliness in the increasingly harsh world environment. Different from the traditional power system, the microgrid mainly uses distributed power sources such as photovoltaics, solar energy, and micro gas turbines to generate power, which can realize power supply in a small area, such as hotels, hospitals, schools, factories, etc. The load is relatively stable Area. Common distributed power interface inverter control methods are divided into constant power control, droop control and constant voltage constant frequency control. Due to the existence of a large number of power electronic devices in the microgrid structure, the sys...

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