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Wind and diesel microgrid frequency modulation control method with double-fed fan participation of load disturbance

A double-fed fan and load disturbance technology, applied in wind power generation, AC network circuits, sustainable manufacturing/processing, etc., can solve the problems affecting the frequency modulation stage, not considering frequency deviation, frequency adverse effects, etc., to improve frequency modulation ability, The effect of enhancing responsiveness

Active Publication Date: 2017-12-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

Literature [16] proposes the time for hysteresis speed recovery, that is, restart recovery when the frequency deviation is zero, but its strategy affects the previous frequency regulation stage and weakens the fan frequency regulation ability
Literature [17] further proposes to start the speed recovery based on the relationship between the electromagnetic power and the mechanical power of the doubly-fed fan. Although the flexible start and speed recovery is realized, the frequency deviation is not considered, which may still have an adverse effect on the frequency

Method used

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  • Wind and diesel microgrid frequency modulation control method with double-fed fan participation of load disturbance
  • Wind and diesel microgrid frequency modulation control method with double-fed fan participation of load disturbance
  • Wind and diesel microgrid frequency modulation control method with double-fed fan participation of load disturbance

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Embodiment Construction

[0065] The load disturbance DFIG participates in the wind-diesel microgrid frequency regulation control method of the present invention. First, an observer is designed to estimate the load disturbance in the microgrid in real time, and the estimated value is allocated to the DFIG and diesel engine proportionally, and combined with the traditional inertial strategy to control the active power output of the DFIG; secondly, a speed recovery module is added, and the starting conditions of the speed recovery module are designed according to the frequency deviation of the microgrid and the power of the DFIG, so that the speed can be faster without affecting the system frequency. recover.

[0066] The present invention will be further described below from the aspects of working mode, design principle, design method, and validity verification.

[0067] 1. Microgrid frequency regulation model and its load disturbance estimation

[0068] 1. Microgrid frequency regulation model

[0069...

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Abstract

The invention relates to a wind and diesel microgrid frequency modulation control method with double-fed fan participation of load disturbance. The method comprises the following steps of designing an observer to carry out real-time estimation on load disturbance in a microgrid, distributing an estimation value to a double-fed fan and a diesel engine according to a proportion, and combining a traditional inertia strategy to control active output of the double-fed fan; additionally arranging a rotating speed recovery module; and according to a microgrid frequency deviation and power of the double-fed fan, designing a starting condition of the rotating speed recovery module, and after a frequency is recovered to be stable, starting the rotating speed recovery module so that a rotating speed is accelerated and is recovered to a level before frequency modulation. A frequency modulation capability of a double-fed fan participated in the microgrid is increased, a response capability of the microgrid to the load disturbance is enhanced and simultaneously a rotating speed recovery process is optimized.

Description

technical field [0001] The invention relates to a microgrid frequency regulation technology, in particular to a method for controlling the frequency regulation of a wind diesel microgrid by a load-disturbed doubly-fed fan. Background technique [0002] Frequency is an important parameter for the safe and stable operation of microgrids. In the island operation mode, the microgrid needs to maintain the source-load balance by itself, so as to ensure the power quality of users. However, due to load switching changes and new energy output fluctuations, independent microgrids may experience power imbalances, resulting in frequency shifts that even exceed the safe operating range. Therefore, microgrids must adopt appropriate active power control strategies to obtain sufficient frequency regulation capability (Reference 1: Peas J A, Moreira C L, Madureira A G. Defining control strategies for microgrids islanded operation [J]. IEEE Transactions on Power Systems, 2006 , 21(2): 916-9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/38
CPCH02J3/386H02J3/46Y02E10/76Y02P80/14
Inventor 符杨张恒一米阳张开宇冯煜尧崔勇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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