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DC microgrid system operation control method and device

A DC microgrid and operation control technology, applied in the field of microgrid, can solve problems such as poor DC bus voltage stability, photovoltaic inverters not equipped with photovoltaic string-level power optimization functions, and DC bus voltage rise, etc., to improve voltage stability sexual effect

Active Publication Date: 2019-11-22
GREE ELECTRIC APPLIANCES INC
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  • Application Information

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Problems solved by technology

[0003] In some related technologies, a power optimizer is configured in the photovoltaic module, and the power optimization at the photovoltaic module level is performed by the power optimizer. The photovoltaic inverter is not equipped with a photovoltaic string-level power optimization function, which makes the voltage stability of the DC bus poor.
For example, when the power on the grid-connected side is limited or standby, the energy on the DC bus cannot be absorbed in time, and the voltage of the DC bus will rise rapidly, causing the power optimizer and photovoltaic inverter to operate at a working condition exceeding the rated voltage, which is easy damaged

Method used

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the drawings in the embodiments of the present disclosure.

[0030] figure 1 It is a schematic diagram of some embodiments of the DC microgrid system of the present disclosure.

[0031] Such as figure 1 As shown, the DC microgrid system 10 includes a plurality of photovoltaic components 11 (such as PV1, PV2, . . . , PVn), a power optimizer 12 configured for each photovoltaic component 11 , and a photovoltaic inverter 13 . A plurality of photovoltaic modules 11 and photovoltaic inverters 13 are connected in series to a DC bus 14 (the positive pole of which is set to DC+, and the negative pole of which is set to DC-). The power optimizer 12 performs maximum power point tracking (Maximum Power Point Tracking, MPPT) at the photovoltaic module level, thereby realizing power optimization at the photovoltaic module level. The photovoltaic...

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Abstract

The invention provides a DC microgrid system operation control method and device, and relates to the field of microgrids. The working mode of the power optimizer is controlled according to the voltagestate of the DC bus and the working state of the photovoltaic inverter, and the voltage stability of the DC bus is improved.

Description

technical field [0001] The present disclosure relates to the field of microgrids, in particular to a method and device for controlling the operation of a DC microgrid system. Background technique [0002] The DC microgrid is a controllable microgrid that connects the micropower sources through the DC bus in the form of DC transmission. DC microgrid can provide high-quality electric energy for individual users and enterprise users. [0003] In some related technologies, a power optimizer is configured in the photovoltaic module, and the power optimization at the photovoltaic module level is performed by the power optimizer. The photovoltaic inverter is not equipped with a photovoltaic string-level power optimization function, which makes the voltage stability of the DC bus poor. For example, when the power on the grid-connected side is limited or standby, the energy on the DC bus cannot be absorbed in time, and the voltage of the DC bus will rise rapidly, causing the power o...

Claims

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Application Information

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IPC IPC(8): H02J7/35H02J1/10H02J1/14H02J5/00H02J3/38
CPCH02J1/10H02J1/14H02J5/00H02J7/35Y02E10/56
Inventor 李萌赵志刚蒋世用刘克勤车伏龙曲东瑞张宁波谢先格
Owner GREE ELECTRIC APPLIANCES INC