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Photovoltaic inverter, control method of photovoltaic inverter, and photovoltaic system

A photovoltaic inverter, inverter technology, applied in photovoltaic power generation, AC network circuits, electrical components, etc., can solve the problems of photovoltaic power cannot be sent to the grid, photovoltaic power generation is wasted, and cannot be connected to the grid.

Pending Publication Date: 2018-05-15
ZTE ENERGY TIANJIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most existing photovoltaic inverters that do not require energy storage batteries and are suitable for AC asynchronous motor loads such as water pumping can only work off-grid and cannot be connected to the grid.
When the load work is completed, such as the end of water pumping, the excess photovoltaic power cannot be sent to the grid, resulting in waste of photovoltaic power generation

Method used

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  • Photovoltaic inverter, control method of photovoltaic inverter, and photovoltaic system
  • Photovoltaic inverter, control method of photovoltaic inverter, and photovoltaic system
  • Photovoltaic inverter, control method of photovoltaic inverter, and photovoltaic system

Examples

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Embodiment 1

[0049] figure 1 It is a structural schematic diagram of a photovoltaic inverter provided in Embodiment 1 of the present invention. This embodiment can be applied to the case where the photovoltaic inverters of AC asynchronous motor loads such as water pumping fields support off-grid and grid-connected switching without the need for energy storage batteries. figure 1 , the photovoltaic inverter 100 includes:

[0050] Grid-connected power frequency circuit 110, the input end is used to input the power output by the photovoltaic module 300, and the output end is connected to the grid-connected connection end 150 and the load connection end 160 of the photovoltaic inverter 100;

[0051] An off-grid frequency conversion circuit 120, the input terminal is used to input the output power of the photovoltaic module 300, and the output terminal is connected to the load connection terminal 160;

[0052] The inverter control unit 130 is electrically connected to the off-grid frequency c...

Embodiment 2

[0060] figure 2 It is a schematic structural diagram of a photovoltaic inverter provided by Embodiment 2 of the present invention. This embodiment provides a structural schematic diagram of an optional photovoltaic inverter on the basis of the first embodiment above.

[0061] refer to figure 2 , optionally, the off-grid frequency conversion circuit 120 includes:

[0062] Off-grid frequency conversion inverter module 121;

[0063] The first DC high-voltage relay 122 is connected between the output end of the MPPT circuit 140 and the power input end of the off-grid variable frequency inverter module 121;

[0064] The first switch 123 is connected between the output terminal of the off-grid variable frequency inverter module 121 and the load connection terminal 160 of the photovoltaic inverter 100;

[0065] The inverter control unit 130 is used to control the conduction and operation of the off-grid frequency conversion circuit 120 by controlling the conduction of the first ...

Embodiment 3

[0103] Figure 4 It is a flow chart of a photovoltaic inverter control method provided by Embodiment 3 of the present invention. This embodiment can be applied to photovoltaic inverters with AC asynchronous motor loads such as water pumping fields without the need for energy storage batteries. Support off-grid and grid-connected switching work. The control method can be executed by the photovoltaic inverter provided in any of the above embodiments. The above-mentioned photovoltaic inverter includes a grid-connected power frequency circuit, the input end is used to input the output power of the photovoltaic module, and the output end is connected to the grid-connected connection end and the load connection end of the photovoltaic inverter; the off-grid frequency conversion circuit, the input end is used for The power output by the photovoltaic module is input, and the output end is connected to the load connection end; the inverter control unit is electrically connected to the...

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Abstract

The invention discloses a photovoltaic inverter, a control method of the photovoltaic inverter, and a photovoltaic system. The photovoltaic inverter comprises a grid-connection industrial frequency circuit, an off-network variable-frequency circuit and an inverter control unit, wherein the input end of the grid-connection industrial frequency circuit is used for inputting the power output by a photovoltaic assembly; the output end of the grid-connection industrial frequency circuit is connected to the grid-connection connection end and the load connection end of the photovoltaic inverter; theinput end of the off-network variable-frequency circuit is used for inputting power output by the photovoltaic assembly; the output end of the off-network variable-frequency circuit is connected to the load connecting end; the inverter control unit is electrically connected with the off-network variable-frequency circuit and the grid-connection industrial frequency circuit, and is used for controlling the grid-connection industrial frequency circuit to work in a grid-connection operation mode; when the grid-connection industrial frequency circuit works, the power is output to the electric network connected with the grid-connection connecting end in a P / Q mode; in an isolated island operation mode, the off-network variable-frequency circuit is controlled to work; when the off-network variable-frequency circuit works, the power is output to a load connected with the load connection end in a V / F mode. The sufficient utilization on the output power of the photovoltaic assembly under the condition of no need of an energy storage battery is realized.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of photovoltaic power generation, and in particular to a photovoltaic inverter, a method for controlling the photovoltaic inverter, and a photovoltaic system. Background technique [0002] Solar photovoltaic power generation systems have been widely used in various fields of life today. The inverter is a device for converting photovoltaic DC power to AC power, and is the core of the entire photovoltaic power generation system. [0003] In the existing technology, it is suitable for photovoltaic inverters of AC asynchronous motor loads such as water pumping fields. For example, photovoltaic water pumping inverters can output frequency conversion, adjust the output voltage and frequency according to photovoltaic power, and drive water pump motor loads for speed regulation. run. [0004] However, most existing photovoltaic inverters that do not require energy storage batteries and are su...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383H02J3/385H02J3/388Y02E10/56
Inventor 邢帅张禹桑轩昂
Owner ZTE ENERGY TIANJIN CO LTD
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