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Modular multi-terminal flexible DC micro-grid network and hierarchical control method thereof

A DC micro-grid, multi-terminal flexible technology, applied in DC network circuit devices, DC network load balance, AC network load balance, etc., can solve the problems of slow output, complex technology, inconvenient expansion and construction, and achieve economical construction The effect of cost, convenient expansion and construction, and reduced floor space

Active Publication Date: 2019-11-05
ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the document "Design and Research of a New Modular Microgrid" pointed out that the development of microgrids has been supported from the policy level, but except for a small number of demonstration projects, the construction of microgrid projects has not been fully rolled out. The main reason is After decades of development of my country's public power grid, the power supply reliability and economy are relatively good; however, the existing micro-grid has a complex structure, inconvenient control mode switching, and inconvenient subsequent expansion construction, and the one-time investment of the project is large, and the output The development is slow and the technology is relatively complex, so the internal demand for its construction and the driving force at the economic level are insufficient

Method used

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  • Modular multi-terminal flexible DC micro-grid network and hierarchical control method thereof
  • Modular multi-terminal flexible DC micro-grid network and hierarchical control method thereof
  • Modular multi-terminal flexible DC micro-grid network and hierarchical control method thereof

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Embodiment 1

[0044] like figure 1 As shown, a modular multi-terminal flexible DC microgrid network includes a DC bus 1, a controllable module 2, an uncontrollable module 3 and a large power grid 13 of the multi-terminal flexible DC microgrid.

[0045] The controllable module 2 includes one or more controllable distributed power sources 4a, battery energy storage 5, DC load 6a and AC load 7a, wherein each controllable distributed power source 4a passes through a distributed power source grid-connected device 8a Incorporated into the DC bus 1, the battery energy storage 5 is connected to the DC bus 1 through the energy storage grid-connected device 9, the DC load 6a is directly connected to the DC bus 1, and the AC load 7a is connected to the DC bus 1 through the AC load grid-connected device 10a.

[0046] The uncontrollable module 3 includes one or more uncontrollable distributed power sources 4b, DC loads 6b and AC loads 7b, wherein each uncontrollable distributed power source 4b is connec...

Embodiment 2

[0060] A hierarchical control method for modular multi-terminal flexible DC microgrid networking, the hierarchical control method is a three-layer control method including a central control layer, a module layer and an original component layer, wherein,

[0061] The central control layer is controlled by the signal of the large power grid to determine whether the large power grid has requirements for the DC micro-grid and whether the power quality of the large power grid meets the standard. The central control layer sends a signal to control the control mode of the bidirectional converter to determine the operation of the DC micro-grid Way;

[0062] The module layer controls the coordinated control of each module. The controllable module must ensure that it responds to the fluctuation of the external uncontrollable module on the basis of satisfying the internal load power, and ensures the stability of the DC bus voltage. When the bus voltage exceeds ±5% of the rated voltage, A...

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Abstract

The invention discloses a modular multi-terminal flexible DC micro-grid network, which comprises a DC bus, a controllable module, an uncontrollable module and a large grid of a multi-terminal flexibleDC micro-grid. The controllable module comprises one or more controllable distributed power sources, a battery energy storage system, a DC load and an AC load, wherein each controllable distributed power source is incorporated into the DC bus through a distributed power source grid connection device, the battery energy storage system is connected to the DC bus through a stored energy grid connection device, the DC load is directly connected with the DC bus, and the AC load is connected with the DC bus through an AC load grid connection device. The control objective is simplified as the bus voltage control of the DC micro-grid, and thus, the control mode can be selected easily. The micro-grid is modularized and changed from a previous 'designed micro-grid' into an 'assembled micro-grid', and the DC micro-grid is divided into multiple controllable modules and uncontrollable modules, which can save the construction cost of the micro-grid, reduce the floor area and facilitate the subsequent expansion of the micro-grid.

Description

technical field [0001] The invention belongs to the field of modular design and operation control of micro-grids, and in particular relates to a modular multi-terminal flexible DC micro-grid networking and a layered control method thereof. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy conversion devices, loads, monitoring and protection devices, etc. It is an autonomous system capable of self-control and management. Due to its good energy management function, the microgrid can effectively maintain the optimal distribution and balance of energy in the microgrid, and ensure the economical operation of the microgrid; the microgrid can also coordinate and control the output power of distributed power sources in the network. , to play the role of load shifting peak and valley filling on the power grid, realize the fixed value or fixed range control of the power exchange between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J1/14H02J3/38H02J3/14H02J3/32
CPCH02J1/00H02J1/14H02J3/38H02J3/14H02J3/32
Inventor 宋文卓刘湘莅郭夫然吴煊伟樊庆玲陈晨董平先孙辉于晓颖吴昊王治孙长海陈百通杭慧芳
Owner ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER
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