Method for selecting frequency control parameters of doubly-fed fan in microgrid

Abstract

The invention relates to a method for selecting frequency control parameters of a doubly-fed fan in a microgrid. The method comprises the steps of determining that a wind turbine generator and a diesel engine participate in a microgrid frequency control strategy in an island mode in common and building a small signal analysis model; and researching characteristic value change trajectories of the microgrid when parameters of a speed regulator of the diesel engine change, finding out a group of typical characteristic roots of reflecting dynamic frequency response characteristics of the microgrid, analyzing the change trajectory rule of obtained typical characteristic values when over-speed control and virtual inertia control parameters of a DFIG change, judging a frequency stability change of the microgrid according to the characteristic value trajectories, obtaining reasonable ranges of over-speed control and virtual inertia control coefficient values of the DFIG and improving PI control parameters. Therefore, the frequency oscillation phenomenon when the over-speed control and virtual inertia control coefficient values exceed the range can be avoided, the ranges of the over-speed control and virtual inertia control coefficient values are expanded, that is to say, a stability margin of the microgrid is increased, and the small interference stability of the microgrid is further strengthened.

Description

technical field [0001] The invention relates to a micro-grid control technology, in particular to a method for selecting frequency control parameters of a doubly-fed fan in a micro-grid based on eigenvalue analysis. Background technique [0002] With the development of new energy utilization technology, especially the high efficiency of wind energy and solar energy utilization, my country's wind power and photovoltaic power generation industries have developed rapidly, and the penetration rate of wind power and photovoltaic power has continued to increase. Controlling, making full use of micro-power generation capacity, improving the reliability of power systems and other advantages, has received extensive attention in recent years. [0003] The microgrid can not only run in parallel with the grid, but also operate in an island when the large grid fails or is planned for maintenance. Due to the small capacity of the microgrid, when the island is running, it loses the support...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem of oscillation caused by improper selection of doubly-fed wind turbine control parameters, and proposes a frequency control parameter selection method for doubly-fed wind turbines in microgrids, making full use of the ability of DFIG wind turbines to participate in frequency modulation to enhance the island mode Frequency Stability and Small Disturbance Stability of Microgrid

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