A cascaded h-bridge grid-connected inverter mppt starting method and main controller

A main controller and inverter technology, applied in AC network circuits, single-network parallel feeding arrangements, electrical components, etc., can solve problems such as H-bridge power mismatch and faults, and achieve the effect of avoiding power imbalance problems

Active Publication Date: 2019-02-01
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0005] The present invention provides a cascaded H-bridge grid-connected inverter MPPT start-up method and a main controller to solve the problem in the prior art that the power mismatch of each H-bridge is likely to occur during start-up and thus lead to failure.

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  • A cascaded h-bridge grid-connected inverter mppt starting method and main controller
  • A cascaded h-bridge grid-connected inverter mppt starting method and main controller
  • A cascaded h-bridge grid-connected inverter mppt starting method and main controller

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Embodiment Construction

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] The invention provides an MPPT start-up method and a main controller of cascaded H-bridge grid-connected inverters, so as to solve the problem in the prior art that the power mismatch of each H-bridge is easily generated during start-up, which leads to faults.

[0048] Specifically, the MPPT starting method of the cascaded H-bridge grid-connected inverter, participates in figure 1 ,include:

[0049] S101. When the current situation of the cascaded H-bridge grid-connected inverter satisfies the MPPT control condition, the main controller sends an MPPT control command to the H-bridge in the first order among the H-bridges that have not completed the MPPT control according to the preset order;

[0050] For example, in a specific p...

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Abstract

The invention provides an MPPT (maximum power point tracking) starting method of a cascade H bridge grid-connected inverter and a main controller. The MPPT starting method has the advantages that the respective MPPT independent control of all H bridges can be realized; before the respective MPPT independent control of all H bridges is realized, the main controller is used for respectively distributing an MPPT control instruction, so as to enable each H bridge to perform MPPT control, thereby solving the problem of power unbalance caused by simultaneous MPPT control in the prior art.

Description

technical field [0001] The invention relates to the technical field of inverter MPPT control, in particular to a method for starting an MPPT of a cascaded H-bridge grid-connected inverter and a main controller. Background technique [0002] Since the photovoltaic panels have different output voltages under the same lighting conditions and environment, the output power will also be different. Therefore, in order to pursue higher power generation, photovoltaic grid-connected inverters are usually equipped with photovoltaic panel MPPT (Maximum Power Point Tracking, maximum power point tracking) control. [0003] The cascaded H-bridge single-phase grid-connected inverter is equipped with an H4 inverter bridge (H-bridge) for each photovoltaic panel, which inverts the DC of the photovoltaic panel into AC, and then outputs the AC of multiple H-bridges. They are connected in series, filtered by the filter inductor, and connected to the power grid. Since the DC to AC in the cascade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 赵德勇江才徐君顾亦磊
Owner SUNGROW POWER SUPPLY CO LTD
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