Grid-connected photovoltaic power generation system capable of dynamically switching invert units and switching method thereof

A technology of inverter unit and grid-connected power generation, which is applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, electrical components, etc., can solve the problems of daily power generation reduction and inverter utilization rate reduction, so as to increase power generation, The effect of improving stability

Inactive Publication Date: 2013-07-24
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

Taking a 10MW photovoltaic power station as an example, for a single-stage inverter, if one of the inverters fails and is disconnected from the grid, the daily power generation of the entire power station will be greatly reduced, and the utilization rate of the inverter will also be greatly reduced

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  • Grid-connected photovoltaic power generation system capable of dynamically switching invert units and switching method thereof
  • Grid-connected photovoltaic power generation system capable of dynamically switching invert units and switching method thereof
  • Grid-connected photovoltaic power generation system capable of dynamically switching invert units and switching method thereof

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Embodiment Construction

[0021] Through the following description of the embodiments, it will be more helpful for the public to understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention, any components or technical features Changes to the definition and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0022] Such as figure 1 In the power generation system of the solar photovoltaic power station shown, the solar panel is connected to the DC power distribution cabinet after passing through the combiner box, and then connected to the inverter. The output of the inverter is connected to the AC power distribution cabinet, and then connected to the power grid through the step-up transformer.

[0023] Such as figure 2 and image 3 As shown in the circuit sch...

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Abstract

The invention discloses a grid-connected photovoltaic power generation system capable of dynamically switching invert units. The power generation system is formed by an invert branch circuit in a driving control mode and an invert branch circuit in a driven control mode in a parallel mode, a direct current is connected into a PV array in a bypass mode, an alternating current is merged into a power grid in a bypass mode, each invert branch circuit is provided with a switch controller, a direct contactor, a direct current voltage stabilization branch circuit, a full bridge inversion unit and a filter return circuit, dynamic switching contactor components are arranged among the PV array and the direct current voltage stabilization branch circuits, dynamic switching switches in the dynamic switching contactor components are connected between the adjacent invert branch circuits in a cross mode, the switch controllers enable the invert branch circuits to be in a standby mode or a working mode through conduction and cut off of the dynamic switching switches, not only can parallel operation of the four invert units be achieved at the same time, but also direct current input of the four invert units is independent, four-way MPPT can be achieved, and circulation does not exist in the return circuits.

Description

technical field [0001] The invention relates to a photovoltaic power generation system, in particular to a photovoltaic power generation system for dynamically switching inverter units; the invention also relates to a dynamic switching method for inverter units in the photovoltaic power generation system. Background technique [0002] Photovoltaic inverter is a key component in photovoltaic power generation system, and its comprehensive performance has a very important impact on power users and power systems. Taking a 10MW photovoltaic power station as an example, for a single-stage inverter, if one of the inverters fails and is disconnected from the grid, the daily power generation of the entire power station will be greatly reduced, and the utilization rate of the inverter will also be greatly reduced . Contents of the invention [0003] The purpose of the present invention is to provide a dynamic switching high-power photovoltaic grid-connected power generation system....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J9/06
CPCY02B10/72Y02E10/566Y02E10/563Y02B10/70Y02E10/56
Inventor 彭良平汤济泽荣先亮曾捷杜毅石峰
Owner DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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