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A kind of precharging circuit and photovoltaic inverter

A pre-charging circuit and photovoltaic inverter technology, which is applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve the problems of current impact and low DC bus pre-charging voltage, so as to avoid current impact and solve the problem of pre-charging voltage low effect

Active Publication Date: 2018-04-10
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a pre-charging circuit and a photovoltaic inverter to solve the problem of low pre-charging voltage of the DC bus, so as to avoid current impact when the photovoltaic inverter is connected to the photovoltaic battery or connected to the grid

Method used

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  • A kind of precharging circuit and photovoltaic inverter
  • A kind of precharging circuit and photovoltaic inverter
  • A kind of precharging circuit and photovoltaic inverter

Examples

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example 1

[0056] see Figure 2a , taking the pre-charging circuit with an AC power source S, a rectifying half-bridge formed by connecting diodes D1 and D2 in series, and an auxiliary charging capacitor Caux as an example (in the figure, Z1 indicates that the pre-charging circuit is connected in series The switch current limiting device on the only charging path; Cbus represents the target charging capacitor. After reaching the charging steady state, the voltage across the target charging capacitor is the DC bus pre-charging voltage): when the AC power supply S is at the forward voltage, the charging path Such as Figure 2b As shown, the current passes through Z1, Caux, Cbus, and D2 to form a charging loop, which charges Cbus and Caux positively; when the AC power supply S is at a negative voltage, the charging path is as follows: Figure 2c As shown, the current passes through D1, Caux, and Z1 to form a charging loop, and reversely charges Caux. Since Caux and Cbus are included in th...

example 2

[0067] see Figure 4a , taking the pre-charging circuit as an example with an AC power source S, a rectifying half-bridge formed by connecting diodes D1 and D2 in series, and two auxiliary charging capacitors Caux1~Caux2 (the switch current limiting device Z1 is connected in series to the charger where Caux1 is located) On the path, the switching current limiting device Z3 is connected in series on the charging path where Caux2 is located, and the switching current limiting device Z3 is connected in series on a section of the charging path shared by Caux1 and Caux2):

[0068] When the AC power supply S is at a forward voltage, there are two charging paths, such as Figure 4b As shown, one of the currents passes through Z2, D1, Cbus, Caux2, and Z3 to form a charging loop to charge Cbus and Caux2; the other current passes through Z2, D1, Caux1, and Z1 to form a charging loop to reversely charge Caux1. When the AC power supply S is at negative voltage, there are two charging pat...

example 3

[0079] In order to make the charging speed faster, the load capacity of the DC side of the inverter is stronger, and the three-phase power rectification can also be fully utilized. Such as Image 6 As shown, the pre-charging circuit includes 3 AC power sources, 3 rectifying half-bridges, 1 auxiliary charging capacitor Caux and 4 switching current limiting devices. Image 6 and Figure 2a The only difference is that the number of AC power supply and half-bridge rectification is increased, and the charging principle remains the same, refer to Figure 2b ~ Figure 2c related descriptions.

[0080] Will Image 6 The circuit shown is applied to the Figure 7 In the shown three-phase two-level photovoltaic inverter, the pre-charging function can be realized by adding additional auxiliary charging capacitor Caux1, three rectifying half-bridges and three switching current limiting devices Z1-Z3. Comparison figure 1 It can be seen that Figure 7 The circuit shown is equivalent di...

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Abstract

The application discloses a pre-charging circuit and a photovoltaic inverter. The pre-charging circuit includes an AC power supply, a rectifying half-bridge, an auxiliary charging capacitor, a current limiting device and a controllable switch. The pre-charging circuit is connected to a target charging capacitor to form a A voltage doubler rectifier circuit, wherein: the DC side of the rectifying half bridge is connected in parallel with the target charging capacitor, the AC side of the rectifying half bridge is connected to one end of the AC power supply; one end of the auxiliary charging capacitor is connected to the Any one end of the target charging capacitor, the other end of the auxiliary charging capacitor is connected to the other end of the AC power supply; the current limiting device is connected in series on each charging path of the pre-charging circuit; the controllable switch is connected in series Each charging path of the pre-charging circuit is used to solve the problem of low pre-charging voltage of the DC bus, so as to avoid current impact when the photovoltaic inverter is connected to the photovoltaic battery or connected to the grid.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a pre-charging circuit and a photovoltaic inverter. Background technique [0002] The photovoltaic inverter is an energy conversion device in the photovoltaic power generation system, which is used to convert the direct current output by the photovoltaic cell into alternating current and then send it to the grid. [0003] When the photovoltaic inverter needs to start under the high voltage of photovoltaic cells, the existing technology will pre-connect such as figure 1 The pre-charging circuit shown is used to increase the pre-charging voltage of the DC bus, so as to avoid the current impact caused by the large voltage difference between the battery voltage and the DC bus voltage at the moment when the photovoltaic battery is connected; In the generator mode, it is also necessary to precharge the DC bus to avoid the current impact caused by the lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02S40/32
CPCH02M1/36H02M7/219H02M7/5387H02M7/797H02M7/125Y02E10/56H02M7/05H02M7/537
Inventor 俞雁飞倪华杨宗军代尚方黄鹏程
Owner SUNGROW POWER SUPPLY CO LTD
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