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

A frequency control and micro-grid technology, applied in wind power generation, electrical components, circuit devices, etc., to achieve the effects of increasing stability margin, enhancing frequency modulation effect and small disturbance stability, and enhancing small disturbance stability

Inactive Publication Date: 2018-02-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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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

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

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Embodiment Construction

[0039]The frequency control parameter selection method of double-fed wind turbine in microgrid based on eigenvalue analysis method includes the following steps:

[0040] (1) Establish a microgrid model for wind and diesel engines, and determine the frequency control strategy of wind turbines and diesel engines to participate in the island mode microgrid: diesel engines are equipped with governors and automatic voltage regulators to participate in frequency and voltage regulation. Composed of inertia control and pitch angle control, doubly-fed wind turbines use overspeed control to obtain primary active power backup to participate in primary frequency modulation, and are equipped with virtual inertia control to increase the equivalent inertia of wind turbines and participate in transient frequency control; linearize the microgrid model and establish a small Signal analysis model.

[0041] (2) Using the small-signal analysis model and dynamic time-domain simulation results, stud...

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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...

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/386H02J3/388H02J2203/20Y02B10/30Y02E10/76
Inventor 赵晶晶左亮亮
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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