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Functional modular microgrid networking and flexible control method

A modular and micro-grid technology, applied to AC networks with the same frequency from different sources, etc., can solve the problem of not being able to exert the controllable resource adjustment capabilities of the micro-grid

Active Publication Date: 2019-10-08
ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER +2
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has a flexible structure and a modular structure, which can constitute a variety of system structures and the research of on-off and off-grid switching of systems at all levels. It solves the problem of distributed power generation access, and cannot exert the adjustment ability of controllable resources in the microgrid.

Method used

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  • Functional modular microgrid networking and flexible control method
  • Functional modular microgrid networking and flexible control method
  • Functional modular microgrid networking and flexible control method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawing:

[0037] Such as figure 1 As shown, the functional modular microgrid network includes isolation transformer 1, AC bus 2, DC bus 3, interconnection module 4, PCC module 17, AC microgrid adjustment module 18, AC microgrid non-adjustable module 19, DC microgrid A grid regulation module 20 and a DC microgrid non-adjustable module 21 .

[0038] The PCC module 17 provides an external interface for the AC-DC hybrid microgrid. The right side is connected to the AC bus 2, and the other side is connected to the large power grid through the isolation transformer 1. The internal equipment of the module is a three-phase AC circuit breaker. The interactive power between the large grid and the microgrid is limited through the power limiting control method in this module.

[0039] The AC microgrid regulation module 18 includes one or more controllable distributed power sources 5 , distribu...

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Abstract

The invention provides an AC / DC hybrid microgrid modular structure and a multi-mode operation mode, and belongs to the field of microgrid modular design and operation control. An AC / DC hybrid microgrid is divided into six modules, and the type and the control mode of distributed power supplies or energy storage in each module are determined. The six modules are a PCC module, an AC microgrid regulation module, an AC microgrid non-regulation module, a DC microgrid regulation module, a DC microgrid non-regulation module and an interconnection module. Double guarantee is provided for the relatively "weak" DC microgrid in the grid-connected microgrid through the conversion operation among the DC microgrid automatic control mode in the grid-connected state, the interconnection module control mode and the island mode in the off-grid state. The controllable distributed power supplies, energy storage and interconnected converters in different modules are combined to be controlled and the microgrid is accessed to a large power grid with a variable power load or power supply. The dependency of MGCC on the communication system is reduced by using a two-layer control method including a module lay and a microgrid layer.

Description

technical field [0001] The invention belongs to the field of micro-grid modular design and operation control, and relates to a functional modular micro-grid networking and flexible control method. Background technique [0002] Microgrid is a small power generation and distribution system formed by the organic combination of distributed power supply, energy storage unit, converter, load, monitoring, communication and protection equipment. Compared with distributed power generation technology, the advantages of micro-grid are more prominent. It can realize the coordinated interaction of source, grid and load, multi-energy complementarity among various distributed power sources, plug and play, network and off-grid operation conversion, and improve power consumption. The reliability of the power supply of the system increases the ability of the distribution network to accommodate distributed power sources, improves the utilization rate of clean energy, and has many advantages su...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 张清峰宋文卓郭夫然刘湘莅孙辉王治周玮孙长海胡姝博彭飞翔高正男
Owner ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER
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