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Non-isolation type photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system

An inverter, non-isolated technology, applied in the field of photovoltaic grid-connected power generation systems, can solve the problems of easy occurrence of electric shock danger, inability to measure the magnitude of leakage current, loss of leakage current fault handling ability, etc., to avoid the effect of electric shock danger

Active Publication Date: 2014-08-13
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the AC side of the non-isolated photovoltaic grid-connected inverter is connected to the isolation transformer 40 (see Figure 1b ), the leakage current will not flow to the AC side, and the leakage current sensor 30 on the AC side cannot measure the magnitude of the leakage current, causing the non-isolated photovoltaic grid-connected inverter to lose its leakage current fault handling capability. High risk of electric shock

Method used

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  • Non-isolation type photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system

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Embodiment 1

[0022] see figure 2 , Embodiment 1 of the present invention discloses a non-isolated photovoltaic grid-connected inverter to ensure that the non-isolated photovoltaic grid-connected inverter still has the ability to handle leakage current faults when the AC side is connected to an isolation transformer, including inverter Variable unit 10, control unit 20, leakage current sensor 30, passive device 40 and controllable switch K, wherein:

[0023] The leakage current sensor 30 is located on the AC side of the inverter unit 10; the control unit 20 is respectively connected to the inverter unit 10 and the leakage current sensor 30;

[0024] One end of the passive device 40 is connected to the DC side of the non-isolated photovoltaic grid-connected inverter, and the other end is grounded after passing through the leakage current sensor 30 through a wire, and the passive device 40 includes an equivalent resistance;

[0025] The controllable switch K is connected in series with the ...

Embodiment 2

[0045] In order to reduce the current flowing through the branch where the passive device 40 is located, another non-isolated photovoltaic grid-connected inverter disclosed in Embodiment 2 further includes a diode connected in series with the passive device 40 . The conduction direction of this diode in the inverter is determined by the type of inverter. The specific analysis is as follows:

[0046] see Figure 3a The non-isolated photovoltaic grid-connected inverter disclosed in the second embodiment based on the type 1 inverter includes: an inverter unit 10, a control unit 20, a leakage current sensor 30, a passive device 40, a controllable switch K, and an anode Connected to the leakage current sensor 30 , the cathode is connected to the negative pole diode D of the non-isolated photovoltaic grid-connected inverter through the passive device 40 .

[0047] When the isolation transformer needs to be connected, it is only necessary to turn on the controllable switch K. At th...

Embodiment 3

[0054] see Figure 5 , Embodiment 3 of the present invention discloses an isolated photovoltaic grid-connected power generation system, including: a photovoltaic module 1, any of the above-mentioned non-isolated photovoltaic grid-connected inverters 2, and a connection grid and each of the non-isolated photovoltaic grid-connected inverters. Isolation transformer for grid-connected inverter 3. Wherein, the number of photovoltaic modules 1 (that is, the number of non-isolated photovoltaic grid-connected inverters 2 ) is not limited.

[0055] In summary, the present invention introduces passive devices and controllable switches into the existing non-isolated photovoltaic grid-connected inverters, one end of the passive devices is connected to the DC side of the inverter, and the other end is passed through a wire After the over-leakage current sensor is grounded, the controllable switch is connected to the control unit and connected in series with the passive device; thus, when ...

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Abstract

The embodiment of the invention discloses a non-isolation type photovoltaic grid-connected inverter comprising an inversion unit, a leakage current sensor, a control unit, a passive device and a controllable switch. The leakage current sensor is connected with the alternating-current side of the inversion unit, the control unit is connected with the inversion unit and the leakage current sensor, one end of the passive device is connected with the direct-current side of the non-isolation type photovoltaic grid-connected inverter, and the other end of the passive device is grounded after penetrating through the leakage current sensor through a wire. The passive device comprises an equivalent resistor. The controllable switch is connected with the passive device in series. The control signal input end of the controllable switch is connected with the control unit so that it can be guaranteed that the non-isolation type photovoltaic grid-connected inverter still has the capacity for processing a leakage current fault under the condition that the alternating-current side is connected with an isolation transformer. In addition, the invention further discloses an isolation type photovoltaic grid-connected power generation system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically, to a non-isolated photovoltaic grid-connected inverter and a photovoltaic grid-connected power generation system. Background technique [0002] see Figure 1a , The non-isolated photovoltaic grid-connected inverter is an energy conversion device of a photovoltaic power generation system, which is used to convert the direct current generated by the photovoltaic module PV into alternating current and then send it to the grid. The components of the inverter include at least an inverter unit 10, a control unit 20, and a leakage current sensor 30; when the DC side of the inverter unit 10 is short-circuited to ground or the impedance is small, a great The leakage current flows to the AC side of the inverter unit 10, and the function of the control unit 20 is to control the inverter to handle the fault when it detects that the leakage current measured by the ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563H02J3/38
Inventor 徐清清杨本和邢军耿后来李浩源梅晓东
Owner SUNGROW POWER SUPPLY CO LTD
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