AC-DC micro-grid distributed scheduling method based on reweighed acceleration Lagrangian

A dispatching method and microgrid technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc.

Active Publication Date: 2015-12-09
ZHEJIANG GONGSHANG UNIVERSITY
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  • Claims
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Problems solved by technology

These bring a lot of nonlinear constraints to the energy scheduling problem of AC-DC hybrid microgrid

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  • AC-DC micro-grid distributed scheduling method based on reweighed acceleration Lagrangian
  • AC-DC micro-grid distributed scheduling method based on reweighed acceleration Lagrangian
  • AC-DC micro-grid distributed scheduling method based on reweighed acceleration Lagrangian

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Embodiment Construction

[0099] In order to express the idea of ​​the present invention more clearly and intuitively, the distributed coordination and optimization process of the AC-DC hybrid microgrid energy dispatching is described in detail, as follows Figure 5 The AC-DC hybrid microgrid shown is an example. The network includes diesel engines, asynchronous fans, reactive power compensation devices, photovoltaic cells and batteries, etc. Node 0 is the master node of the microgrid. The branch set Ψ of the AC microgrid a :={(0,1),(1,2),(2,3),(3,4),(1,5)}, DC microgrid part Ψ b :={(6,7),(7,8)}, the branch (1,6) is the ACDC converter branch. The maximum and minimum limits of diesel engine output are: 6kW and 3kW respectively; the up and down ramp rates are 10kW / min and 5kW / min respectively; the maximum and minimum limits of reactive output power are: 19.7kVar and 0.986kVar respectively; Δt=15min; The total battery capacity is 60kWh.

[0100] The implementation of distributed coordination and optimiz...

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Abstract

The invention discloses an AC-DC micro-grid distributed scheduling method based on reweighed acceleration Lagrangian. According to the method, an AC-DC mixed micro-grid linear cone optimal power flow model including converter power flow restraint is built, an AC-DC mixed micro-grid is divided into an AC micro-grid subsystem and a DC micro-grid subsystem by employing a virtual auxiliary variable method, a distributed coordination optimization method based on local reweighing Lagrangian is proposed, and distributed coordination optimization of resource scheduling of the whole grid is realized. According to the method, parallel and synchronous iterative solution of various subsystems can be realized, global coordination is not needed, only a little information interaction between the adjacent subsystems is needed, the calculating efficiency is high, and the convergence characteristic is good.

Description

technical field [0001] The invention belongs to the technical field of micro-grid energy optimization dispatching, and in particular relates to a distributed self-discipline economic dispatching method of an AC / DC hybrid micro-grid including a fan, a solar photovoltaic cell, a traditional diesel engine and an energy storage device. Background technique [0002] At the end of the 21st century, renewable energy will play a leading role in the world's energy structure. The development of renewable energy has also led to the development of micro-grids. Micro-grids can economically and efficiently meet the requirements of diversified and highly reliable power supply for users, and serve as a beneficial supplement to the power grid. Since the photovoltaic cells initially generate DC power, and most of the electricity consumed by office and residential buildings is DC loads, the DC microgrid is composed of photovoltaics and energy storage to supply power to DC loads, omitting many ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/00
Inventor 李静戴文战赵忠伟沈忱
Owner ZHEJIANG GONGSHANG UNIVERSITY
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