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Photovoltaic power generation control method and photovoltaic power station

A control method and photovoltaic power generation technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as raising the DC side voltage of photovoltaic inverters, affecting device life, photovoltaic energy waste, etc., to curb photovoltaic energy waste. , to ensure the effect of limited power operation

Active Publication Date: 2017-06-13
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this will cause a great waste of photovoltaic energy, and it will also increase the DC side voltage of the photovoltaic inverter, affecting the life of the device

Method used

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  • Photovoltaic power generation control method and photovoltaic power station

Examples

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Effect test

Embodiment 1

[0038] In order to avoid energy waste when the photovoltaic inverter operates with limited power, improve the utilization rate of photovoltaic energy, and prevent the voltage on the DC side of the photovoltaic inverter from being too high, the embodiment of the present invention discloses an application such as figure 2 The photovoltaic power generation control method of the photovoltaic power station shown.

[0039] The photovoltaic power station includes a photovoltaic module 100, a photovoltaic inverter 200, a shunt power supply device 300 and a constant load 400, wherein: the DC side of the photovoltaic inverter 200 is connected to the photovoltaic module 100, and the AC side is connected to the grid; the input of the shunt power supply device 300 The photovoltaic module 100 is connected to the side, and the constant load 400 is connected to the output side.

[0040] It should be noted that the so-called constant load refers to a load with constant impedance, and the load...

Embodiment 2

[0052] The embodiment of the present invention discloses an application such as Figure 4 The photovoltaic power generation control method of the photovoltaic power station shown.

[0053] The photovoltaic power station includes a photovoltaic module 100, a photovoltaic inverter 200, a shunt power supply device 300 and a variable load 400, wherein: the DC side of the photovoltaic inverter is connected to the photovoltaic module 100, and the AC side is connected to the grid; the input of the shunt power supply device 300 The side is connected to the photovoltaic module 100 , and the output side is connected to the variable load 400 .

[0054] It should be noted that the so-called variable load refers to a load with variable impedance, and the load type may be a DC load or an AC load. When the variable load 400 is a DC load with variable impedance, the shunt power supply device 300 uses a DC / DC converter; when the variable load 400 is an AC load with variable impedance, the shu...

Embodiment 3

[0067] The embodiment of the invention discloses a photovoltaic power station, including a photovoltaic module, a photovoltaic inverter, a shunt power supply device, a constant load and a control system (for the specific structure of a photovoltaic power station, please refer to figure 2 , figure 2 The control system is not shown in), wherein:

[0068] The DC side of the photovoltaic inverter is connected to the photovoltaic module, and the AC side is connected to the grid;

[0069] The input side of the shunt power supply device is connected to the photovoltaic module, and the output side is connected to a constant load;

[0070] The control system is used to determine whether the output power of the photovoltaic inverter reaches the power limit value after the photovoltaic inverter is connected to the grid, wherein the default operation of the photovoltaic inverter is in the MPPT mode after the photovoltaic inverter is connected to the grid; when the photovoltaic inverter...

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Abstract

The invention discloses a photovoltaic power generation control method and a photovoltaic power station. The photovoltaic power generation control method is applied to the photovoltaic power station. The photovoltaic power station comprises a photovoltaic component, a photovoltaic inverter, a shunt power supply device and a load, wherein the direct current side of the photovoltaic inverter is connected with the photovoltaic component, the alternating current side of the photovoltaic inverter is connected to a grid, the input side of the shunt power supply device is connected with the photovoltaic component, and the output side of the shunt power supply device is connected with the load. The photovoltaic power generation control method comprises the steps that after the photovoltaic inverter is connected to the grid to operate, whether the output power of the photovoltaic inverter reaches a limited power value or not is judged, wherein the photovoltaic inverter defaults to work in an MPPT mode after being connected to the grid; when the output power of the photovoltaic inverter reaches the limited power value, the shunt power supply device is started, and the shunt power supply device is stopped until the output power of the photovoltaic inverter is smaller than a first threshold value; accordingly, energy waste generated when the photovoltaic inverter operates at the limited power is avoided, the utilization rate of photovoltaic energy is increased, and the condition that the voltage of the direct current side of the photovoltaic inverter is too high is prevented.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a photovoltaic power generation control method and a photovoltaic power station. Background technique [0002] Photovoltaic inverter is an important energy conversion device in a photovoltaic power station, which is used to convert the direct current output from photovoltaic modules into alternating current and then send it to the grid, such as figure 1 shown. [0003] In recent years, photovoltaic power plants in different regions have adopted the design idea that the ratio of photovoltaic module capacity to photovoltaic inverter capacity is greater than 1, in order to achieve the purpose of improving the operating efficiency of photovoltaic inverters and the revenue of photovoltaic power plants. After the photovoltaic inverter is connected to the grid, it will quickly track the maximum power point of the photovoltaic module in the MPPT (Maximum P...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 罗伟伟
Owner SUNGROW POWER SUPPLY CO LTD
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