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Combined three-phase microgrid system with serially-connected microsource inverters

A series connection and inverter technology, applied in AC network load balancing, single network parallel feeding arrangement, AC network to reduce harmonics/ripples, etc., can solve problems such as harmonics, complicated control of circulation stability, etc.

Inactive Publication Date: 2015-09-30
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the existing problems of harmonics, circulating currents, and complex stability control in the existing AC, DC, and AC / DC hybrid ordinary microgrids. The present invention provides an H-bridge micro-source inverter connected in series The combined three-phase microgrid system structure

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  • Combined three-phase microgrid system with serially-connected microsource inverters
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  • Combined three-phase microgrid system with serially-connected microsource inverters

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Embodiment Construction

[0011] The present invention is a combined three-phase micro-grid system in which micro-source inverters are connected in series, such as figure 1 , figure 2 As shown, in the three symmetrical A-phase subsystems 1, B-phase subsystems 2, and C-phase subsystems 3, the first DC power generation unit 26 and the second DC power generation unit 27 respectively pass through the DC / DC conversion link and The DC link capacitor C is then connected in parallel to the DC input sides of the second H-bridge micro-source inverter 13 and the third H-bridge micro-source inverter 14, and the first AC power generation unit 25 and the second AC power generation unit 28 respectively pass through the AC The / DC conversion link and the DC link capacitor C are connected in parallel to the DC input sides of the first H-bridge micro-source inverter 12 and the fourth H-bridge micro-source inverter 15, and the first H-bridge micro-source inverter 12, The AC output sides of the second H-bridge micro-so...

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Abstract

Disclosed is a combined three-phase microgrid system with serially-connected microsource inverters. The combined three-phase microgrid system is formed by combining three symmetric subsystems including a phase-A subsystem, a phase-B subsystem and a phase-C subsystem. H-bridge microsource inverters in the three symmetric subsystems inside the combined three-phase microgrid system are serially connected together. Different main microsource direct-current chains are configured with energy storing systems so as to suppress fluctuation of voltage of direct-current chains. Additionally, microsource disconnection / recovery operation can be achieved through corresponding switching operation. By the aid of the structure, the combined three-phase microgrid system is low in output voltage harmonic content and good in sine degree; a rated operational voltage grade of each microsource is low, and accordingly, system construction cost is low; the microsource inverters are the same in output frequency and current, so that system output frequency is stable and power coordinated control is simple. By the aid of the networking mode, the combined three-phase microgrid system is capable of structurally solving the problems of harmonic waves, circular current, control complexity and the like in common alternating-current , direct-current and alternating-current and direct-current hybrid microgrids.

Description

technical field [0001] The invention relates to a three-phase microgrid topology. Background technique [0002] Energy shortage and environmental pollution in today's society are common problems worldwide. The distributed power generation technology developed under this background is becoming more and more mature. The grid-connected operation of a large number of distributed power generation units brings harmonic pollution to the traditional external power grid, and at the same time makes the external power grid more vulnerable. Microgrid technology provides an effective way to solve the grid connection problem of a large number of distributed power generation units, and has also become an important means to optimize the traditional grid structure. [0003] At present, there are mainly three types of microgrid grid structures: AC type, DC type, and AC-DC hybrid type. They almost all follow the traditional power network structure, and there are some difficult problems inside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38H02J3/32
CPCY02E40/40
Inventor 王兴贵杨维满李晓英
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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