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Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid

A micro-grid and series-connected technology, applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problems of high construction and operation costs, and achieve low system construction costs, simple power coordination control, and low voltage levels. Effect

Active Publication Date: 2015-07-29
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] The high cost of construction and operation is a common problem faced by any structural microgrid at present

Method used

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  • Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid
  • Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid
  • Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid

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Embodiment Construction

[0014] like figure 1 , figure 2 As shown, the present invention is a power coordination control method between a series microgrid and its micro-sources. The series microgrid is composed of symmetrical A-phase subsystem 1, B-phase subsystem 2, and C-phase subsystem 3 Combined by star connection, the first AC power generation unit 18 and the second AC power generation unit 21 in each phase subsystem are respectively connected to the first H-bridge micro The source inverter 10, the fourth H-bridge micro-source inverter 13, the first DC power generation unit 19, and the second DC power generation unit 20 are respectively connected to the second H-bridge micro-power inverter through the DC / DC conversion link and capacitor C. Source inverter 11, third H-bridge micro-source inverter 12, first H-bridge micro-source inverter 10, second H-bridge micro-source inverter 11, third H-bridge micro-source inverter 12, The fourth H-bridge micro-source inverter 13 passes through the first byp...

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Abstract

The invention discloses a method for coordinating and controlling the power between a series-connected micro-grid and micro-sources of the series-connected micro-grid, which has two normal operating states, namely islanding and grid connecting, simultaneously. According to the structure, the overall system consists of three symmetrical subsystems of A, B and C; H-bridge micro-source inverters of the three internal symmetrical subsystems are connected together in series. Different main micro-source direct-current links are configured with energy storage systems so as to inhibit the fluctuation of the voltages of the direct-current links. In addition, the splitting / recovering operation of the micro-sources can also be realized through corresponding switching operations. According to the structure, the harmonic content of the output voltage of the system is low; the sine degree of a waveform is good; the rated working voltage level of each micro-source is low; the system construction cost is relatively low; the output frequencies and the currents of all micro-source inverters are equal to one another; the output frequency of the system is stable and the power coordination and control are relatively simple.

Description

technical field [0001] The invention relates to a power coordination control technology between a micro grid and a micro source. Background technique [0002] At present, microgrid technology has become an important means to solve problems such as environmental pollution, energy shortage, and centralized grid connection of a large number of distributed power generation units. Since the development of micro-grids, there are mainly three types of structures: DC type, AC type, and AC-DC hybrid type. Since they almost all use the traditional power network structure, there are circulating currents, harmonics, output voltage and frequency stability, and power in the system. Coordination and control of complex issues. So far, these problems have not been well resolved. [0003] The high cost of construction and operation is a common problem faced by any structural microgrid at present. At present, the reduction of construction costs is mainly achieved through the capacity optimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
Inventor 王兴贵杨维满李晓英
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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