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A Frequency Recovery and Optimal Power Allocation Method for Island AC Microgrid Based on Distributed Layer 2 Control

A technology of frequency recovery and optimal distribution, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as frequency deviation, and achieve the effect of realizing frequency recovery, improving economic efficiency and high practical value.

Active Publication Date: 2022-05-03
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] Based on the above problems, the present invention provides a method for frequency recovery and optimal power distribution of island AC microgrids based on distributed two-layer control. value, it can also realize the distribution of the output active power of the microgrid system in any proportion

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  • A Frequency Recovery and Optimal Power Allocation Method for Island AC Microgrid Based on Distributed Layer 2 Control
  • A Frequency Recovery and Optimal Power Allocation Method for Island AC Microgrid Based on Distributed Layer 2 Control
  • A Frequency Recovery and Optimal Power Allocation Method for Island AC Microgrid Based on Distributed Layer 2 Control

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[0038] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be described in detail below in combination with the accompanying drawings and implementation examples. It should be understood that the specific implementation cases described here are only used to explain the present invention, and are not intended to limit the invention.

[0039] refer to Figure 1 to Figure 10 , a method for frequency recovery and optimal power distribution of an isolated AC microgrid based on distributed two-layer control, including the following steps:

[0040] Step 1), establish the AC microgrid system model

[0041] Based on the droop control strategy, the output frequency expression of the AC microgrid is obtained as shown in formula (1):

[0042]

[0043] where τ P is the filter time constant, ω is the output frequency, ω d is the frequency setting value, k P is the droop coefficient, P is the output active pow...

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Abstract

An isolated island AC microgrid frequency recovery and power optimal distribution method based on distributed two-layer control. Model the microgrid system to obtain the system dynamic equation; determine the control target; and build a distributed controller; finally through the Analyze the steady state of the system to realize frequency restoration and on-demand distribution of active power. The method of the present invention considers the problem of frequency deviation caused by the sagging of the bottom layer in the AC microgrid, and the proposed distributed two-layer controller can not only realize frequency recovery, but also allow active power to be allocated on demand, so that the economic benefits of the microgrid system are further improved improvement.

Description

technical field [0001] The invention belongs to the field of micro-grid control, and in particular relates to a frequency recovery and power optimal distribution method of an island-type AC micro-grid based on distributed two-layer control. Background technique [0002] With the rapid development of new energy sources including renewable energy (renewable energy source, RES), wind energy (wind source, WS) and photovoltaic (photovoltaic, PV) and the improvement of electricity reliability, efficient and low-carbon distributed power (Distributed generation, DG) as the basis, combined with energy storage units, loads and related control devices Microgrid (Microgrid, MG) has received more and more attention. Unlike fossil fuel thermal generators in traditional power systems, DGs in microgrid systems are generally powered by clean energy. These distributed energy sources usually produce intermittent power fluctuations and have weak power generation capabilities. Therefore, the co...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48
Inventor 郭方洪李赫董辉张文安周丹
Owner ZHEJIANG UNIV OF TECH
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