Optical storage alternating current and direct current hybrid micro-grid system and control method thereof

A technology of AC-DC hybrid and micro-grid controller, which is applied in the direction of AC network circuit, AC network load balance, and single AC network with different frequencies, etc., to avoid overcharging and overdischarging, reasonable and scientific network topology design, and improve power supply quality and the effect of renewable energy utilization

Active Publication Date: 2015-01-28
HEFEI UNIV OF TECH
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Problems solved by technology

In this context, pure AC microgrids or DC microgrids show limitations

Method used

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  • Optical storage alternating current and direct current hybrid micro-grid system and control method thereof
  • Optical storage alternating current and direct current hybrid micro-grid system and control method thereof
  • Optical storage alternating current and direct current hybrid micro-grid system and control method thereof

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Embodiment Construction

[0026] The optical-storage AC-DC hybrid microgrid system in this embodiment includes an AC sub-microgrid system, a DC sub-microgrid system, and a power exchange control system.

[0027] Such as figure 1 As shown, the AC sub-microgrid system includes AC-side photovoltaic power generation units, AC loads and grid-connected interfaces, and photovoltaic power generation DC / AC converters. The AC sub-microgrid system adopts a single-bus structure with a voltage level of AC380V. The determination of the voltage level of the AC sub-microgrid system is based on the capacity of distributed power sources in the microgrid on the one hand, and on the other hand, it must be convenient for grid connection. The distributed power supply capacity in the hybrid microgrid in this embodiment is lower than 200kW, so the AC bus voltage level is selected as 380V, which can greatly facilitate grid connection.

[0028] In this embodiment, the AC sub-microgrid system adopts the TN-C-S grounding method....

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Abstract

The invention relates to an optical storage alternating current and direct current hybrid micro-grid system and a control method of the system. The system and the method are characterized in that a hybrid micro-grid comprises an alternating current micro-grid subsystem, a direct current micro-grid subsystem and a power exchange control system; the alternating current micro-grid subsystem comprises an alternating current side photovoltaic power generation unit, an alternating current load and a grid-connected interface; the direct current micro-grid subsystem comprises a direct current side photovoltaic power generation unit, a storage battery energy storage unit and a high/low voltage direct current load; the power exchange control system comprises a two-way AC/DC power converter, a transformer, a micro-grid controller and a communication system, the storage battery energy storage unit is used for controlling direct current bus voltages, and P/Q control is adopted in the two-way AC/DC power converter. Under the stabilizing effect of direct current side energy storage, the direct current micro-grid subsystem conducts photovoltaic power generation and is connected to a large power grid through the alternating current micro-grid subsystem at constant power, and the photovoltaic utilization rate is increased. By means of the control method, the power supply reliability and economical efficiency of the hybrid micro-grid are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation and micro-grid, and in particular relates to an optical-storage AC-DC hybrid micro-grid system. Background technique [0002] In recent years, based on problems such as the fossil energy crisis, environmental protection pressure, and the limitations of the existing grid structure development, microgrids have developed rapidly. There are many classification standards for microgrids. From the perspective of grid structure and power supply methods, microgrids can be divided into AC microgrids, DC microgrids, and AC-DC hybrid microgrids. At present, the AC microgrid is still the main form of the microgrid. Although the research on the AC microgrid has achieved many results, it is still necessary to further solve the impact of resonance and harmonics brought about by the parallel connection of distributed power sources. Compared with the AC microgrid, the DC microgrid system does ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J5/00H02J7/35
CPCH02J3/02H02J3/32H02J3/383H02J3/388H02J5/00Y02E10/56
Inventor 丁明田龙刚潘浩吴红斌张国荣邱亚
Owner HEFEI UNIV OF TECH
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