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Coordinated control method for hybrid series-parallel microgrid in island mode

A technology of coordinated control and island mode, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as system reliability reduction, reduce communication costs, improve reliability and flexibility, and enhance plug-and-play effect of ability

Active Publication Date: 2019-08-02
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

Although this method can achieve good power sharing performance, the reliability of the system will be greatly reduced due to the introduction of the central controller

Method used

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  • Coordinated control method for hybrid series-parallel microgrid in island mode
  • Coordinated control method for hybrid series-parallel microgrid in island mode
  • Coordinated control method for hybrid series-parallel microgrid in island mode

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Embodiment Construction

[0062] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0063] The invention discloses a coordinated control method for a hybrid series-parallel microgrid system in an island mode. The structure schematic diagram of the hybrid series-parallel AC microgrid system is as follows figure 1 As shown, its equivalent circuit diagram is shown in figure 2 shown. Local distributed power sources are cascaded with each other through interface inverters to form micro-source strings with higher voltage levels, and the micro-source strings are connected in parallel through line impedances to supply power to public loads. This AC microgrid has a simple structure, features of high voltage level and high power capacity, flexible application an...

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Abstract

The invention provides a locally distributed and globally decentralized coordinated control method for a hybrid series-parallel microgrid in an island mode, and belongs to the field of microgrid operation control. Firstly, distributed power supplies in the hybrid series-parallel AC microgrid are locally cascaded through interface inverters to form a micro-source string with a high voltage level; and secondly, the micro-source string supply power to high-power public loads in a parallel connection mode. The coordinated control method for the microgrid in the island mode is designed accordingly,and the design principle of control parameters is provided. The method can operate effectively under various load conditions. The coordinated control method disclosed by the invention achieves the equalization of the output active and reactive power of DG units of the microgrid while ensuring the frequency synchronization of the system. Compared with the traditional control, only the communication between the local power supplies is needed, so that the flexibility of the microgrid is enhanced, and the power quality and reliability of the microgrid are improved.

Description

technical field [0001] The invention belongs to the technical fields of distributed power generation, power electronic control technology and micro-grid, and in particular relates to a coordinated control method for mixed series-parallel micro-grid in island mode. Background technique [0002] Distributed power generation mostly uses renewable energy, which has unique advantages such as less pollution, high energy utilization rate, flexible installation location, low loss of transmission and distribution resources and transmission lines, and gradually becomes an effective support for large-scale power grids in the future. It is the development of future power systems one of the trends. Then the geographical dispersion and the large number understand that the distributed power supply lacks a unified and effective control method. The proposal of the microgrid aims to realize the flexible and efficient application of distributed power, and solve the problems of grid connection...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J3/388
Inventor 韩华葛小海孙尧柳张杰粟梅熊文静刘永露
Owner CENT SOUTH UNIV
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