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A kind of photovoltaic device with both AC and DC

An AC-DC dual-purpose, photovoltaic equipment technology, applied in photovoltaic power generation, photovoltaic modules, AC network circuits, etc., can solve problems such as only DC voltage, poor flexibility and versatility, and inability to achieve power regulation, and achieves a high level of universality. sexual effect

Active Publication Date: 2020-01-21
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Among the three types of photovoltaic modules mentioned above, the first type of traditional components cannot achieve power regulation, and the latter two types can realize power conversion and independent MPPT for each component, but the output of the components can only be AC ​​voltage or DC Voltage
In response to the diverse photovoltaic applications in the future, the above-mentioned technologies have problems of poor flexibility and versatility

Method used

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  • A kind of photovoltaic device with both AC and DC
  • A kind of photovoltaic device with both AC and DC
  • A kind of photovoltaic device with both AC and DC

Examples

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Embodiment 1

[0051] see Figure 4 , which is a schematic diagram of Embodiment 1 of an AC and DC dual-purpose photovoltaic device provided by the present invention.

[0052] The AC and DC dual-purpose photovoltaic equipment provided in this embodiment includes: a photovoltaic module 100, a DC side capacitor C, a DC-pulse width modulation DC-PWM power switch circuit 200, and a controller 300;

[0053] The DC side capacitor C is connected in parallel to the output end of the photovoltaic module 100;

[0054] The input end of the DC-PWM power switch circuit 200 is connected to the output end of the photovoltaic module;

[0055] The DC-PWM power switch circuit 200 includes a controllable switch tube;

[0056]The controller 300 is configured to output a switch control signal to control the switch state of the controllable switch tube in the DC-PWM power switch circuit 200, so that the DC-PWM power switch circuit 200 outputs a DC PWM wave or an AC PWM wave ; When the switch control signal is ...

Embodiment 2

[0065] see Figures 5a-5c , which is a schematic diagram of Embodiment 2 of the AC and DC dual-purpose photovoltaic device provided by the present invention.

[0066] In this embodiment, the DC-PWM power switching circuit is implemented by a full bridge circuit as an example for introduction.

[0067] For details, please refer to Figures 5a-5c , the full bridge circuit includes four controllable switch tubes, namely S1-S4. Controlling the switching states of the four controllable switching tubes can make the full bridge circuit output different levels.

[0068] Specifically, +1, 0, -1 levels can be generated. Figure 5a It shows that when S1 and S4 are turned on in the H-type full bridge circuit, +1 level can be generated when S2 and S3 are turned off.

[0069] Figure 5b It shows that S3 and S4 are turned on in the H-type full bridge circuit, and 0 level can be generated when S1 and S2 are turned off. It should be noted that in the H-type full-bridge circuit, S3 and S4...

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Abstract

The present invention provides a photovoltaic device with both AC and DC, including: a photovoltaic module, a DC side capacitor, a DC-Pulse Width Modulation DC-PWM power switch circuit and a controller; the DC side capacitor is connected in parallel at the output end of the photovoltaic module; The input end of the PWM power switch circuit is connected to the output end of the photovoltaic module; the DC-PWM power switch circuit includes a controllable switch tube; the controller is used to output a switch control signal to control the switch state of the controllable switch tube in the DC-PWM power switch circuit , so that the DC-PWM power switch circuit outputs a DC PWM wave or an AC PWM wave; when the switch control signal is a DC modulation signal, the DC-PWM power switch circuit outputs a DC PWM wave; when the switch control signal is an AC modulation signal, the DC ‑PWM power switch circuit outputs AC PWM wave. It can be applied not only to occasions requiring DC power supply, but also to occasions requiring AC power supply, thereby improving the versatility.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic device with both AC and DC functions. Background technique [0002] Traditional photovoltaic modules usually include solar cells, frames, glass, backsheets and junction boxes, etc. The junction box is generally a bypass diode. The bypass diode is reversely connected to both ends of a group of photovoltaic cells in series. When the cells are blocked or faulty, they are positively biased and turned on to protect the photovoltaic cells. In the improvement of traditional components, some manufacturers use MOSFETs instead of traditional diodes to improve efficiency, and some integrate data acquisition and communication systems. Traditional photovoltaic modules have simple functions, and generally require an external converter to connect to the grid or supply power to the load. figure 1 is an example of a traditional photovoltaic module. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/30H02S40/32H02J1/10H02J3/38
CPCH02J3/385H02S40/30H02S40/32H02J1/10H02J3/381H02J2300/24H02M1/10H02M1/126H02M3/158H02M7/487H02M7/53871H02M7/5395Y02E10/56H02M1/0077H02P7/28F21S8/085F21S9/03F21Y2115/10
Inventor 曹仁贤顾亦磊谷雨徐君
Owner SUNGROW POWER SUPPLY CO LTD