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Micro-grid small signal stability analytical method

A technology of stability and analysis method, applied in the field of micro-grid application research, to achieve the effect of improving accuracy

Inactive Publication Date: 2014-02-05
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

When analyzing small disturbances in the microgrid system to establish a state space model, the existing network state space models use network differential equations and network steady-state equations. Which equation is more reasonable for small-signal stability analysis? no clear conclusion

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  • Micro-grid small signal stability analytical method

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Embodiment Construction

[0014] figure 1 The microgrid small signal stability analysis flow chart, as shown in the figure, first judges the voltage level of the microgrid network according to the voltage level of the microgrid 400V and 10kV, if it is a 400V system, select the network equation establishment method as the network steady state equation method, Then by establishing the corresponding network linearization model, controller linearization model and measurement unit linearization model for small signal stability analysis, droop gain changes, load changes and line impedance changes can be considered in the analysis, this method can simplify the system The stability analysis model does not affect the analysis results; if it is a 10kV system, the network equation establishment method is selected as the differential equation method, and then the small signal is carried out by establishing the corresponding network linearization model, controller linearization model and measurement unit linearizati...

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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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Application Information

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IPC IPC(8): G05B17/02
Inventor 肖朝霞赵倩宇
Owner TIANJIN POLYTECHNIC UNIV
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