Unlock instant, AI-driven research and patent intelligence for your innovation.

A voltage compensation device for a photovoltaic system and a photovoltaic system

A photovoltaic system and voltage compensation technology, applied in photovoltaic power generation, circuit devices, photovoltaic modules, etc., can solve problems such as high cost and affect the reliability of photovoltaic systems, and achieve the effect of preventing PID

Active Publication Date: 2018-02-23
SUNGROW POWER SUPPLY CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a voltage compensation device is added on the DC side of the photovoltaic system. For a photovoltaic system with multiple photovoltaic inverters connected in parallel on the AC side, it is necessary to add a voltage compensation device on the DC side of each photovoltaic inverter, so the cost is high In addition, there may be circulating currents between multiple voltage compensation devices, which will affect the reliability of the photovoltaic system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A voltage compensation device for a photovoltaic system and a photovoltaic system
  • A voltage compensation device for a photovoltaic system and a photovoltaic system
  • A voltage compensation device for a photovoltaic system and a photovoltaic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] see figure 1 , which is a schematic diagram of a voltage compensation device for a three-phase photovoltaic system provided by the present invention.

[0067] The voltage compensation device provided by this embodiment is applied to a photovoltaic system, and the photovoltaic system includes: a photovoltaic array PV, a converter 100, and a transformer 200; the output end of the converter 100 is connected to the primary side of the transformer 200, and the The input end of the converter 100 is connected to the photovoltaic array PV;

[0068] The device includes: a current limiting module 300 and a compensation power supply 400 connected in series; or, the device only includes the current limiting module 300 .

[0069] It can be understood that when the device includes the current limiting module 300 and the compensation power supply 400, it is equivalent to having a preset voltage potential between the output terminal of the converter 100 and the ground, and the preset ...

Embodiment 2

[0085] The following is an introduction to a three-phase photovoltaic system as an example. It can be understood that the voltage compensation device in a single-phase photovoltaic system is exactly the same as when only one phase of a three-phase photovoltaic system is connected to a voltage compensation device. Single-phase photovoltaic systems are introduced separately.

[0086] It should be noted that the current limiting module is any one of the following:

[0087] Diodes, body diodes for MOSFETs, antiparallel diodes for IGBTs, thyristors, and Zener diodes.

[0088] In the following, the diode is used as an example to introduce the current limiting module. It can be understood that the diode has the characteristic of unidirectional conduction.

[0089] see image 3 , which is a schematic diagram of Embodiment 2 of the voltage compensation device provided by the present invention.

[0090] image 3 The shown device is applied to a three-phase photovoltaic system, but o...

Embodiment 3

[0094] see Figure 5 , which is a schematic diagram of Embodiment 3 of the voltage compensation device provided by the present invention.

[0095] The voltage compensation device provided in this embodiment further includes: a current limiting module connected in series with the current limiting module;

[0096] The current limiting module includes at least one of the following: a resistor and an inductor.

[0097] It can be understood that the current limiting module can be only a resistor or an inductor, or can be a series connection of a resistor and an inductor, can also be a parallel connection of a resistor and an inductor, or can be a series and parallel connection of a resistor and an inductor.

[0098] The effect of setting the current limiting module in this embodiment is mainly to suppress the leakage current size of the photovoltaic system flowing through the device; in addition, it can also suppress the transient overcurrent when the voltage compensation device i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a voltage compensation device for a photovoltaic system and a photovoltaic system, wherein the voltage compensation device includes: a current limiting module and a compensation power supply connected in series; or, the device only includes a current limiting module; the current limiting module includes at least one current limiting unit Conductive device; this device is connected between the output of the converter and ground. The system includes: a photovoltaic array, a converter, a transformer and a voltage compensation device; the output of the converter is connected to the primary side of the transformer, and the input of the converter is connected to the photovoltaic array; the voltage compensation device is used to raise or pull down the inverter voltage at the output of the device. Because the device that restricts the unidirectional conduction of current only allows the current to flow in the allowed direction, and cannot flow in the opposite direction. Therefore, the lowest value or the highest value of the output voltage of the converter can be clamped to the voltage of the compensation power supply or clamped to the ground by using the device that limits the unidirectional conduction of the current.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a voltage compensation device for a photovoltaic system and a photovoltaic system. Background technique [0002] Potential Induced Degradation (PID, Potential Induced Degradation) refers to the attenuation of output characteristics of certain types of photovoltaic panels due to potential induction at a specific ground voltage. The PID effect will lead to a decrease in the output power of the photovoltaic system. [0003] Therefore, in order to prevent or weaken the PID effect, it is necessary to compensate the ground voltage of the photovoltaic system so that the bias voltage of the photovoltaic cell panel to the ground is in a region where the PID effect does not occur. [0004] In the prior art, a voltage compensation device is added on the DC side of the photovoltaic system. For a photovoltaic system with multiple photovoltaic inverters connected in para...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/30H02S40/32
CPCH02S40/30H02S40/32H02J3/381H02J2300/24H02J3/46Y02E10/56H02M7/44
Inventor 俞雁飞倪华杨宗军代尚方
Owner SUNGROW POWER SUPPLY CO LTD