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Inverter system, inverter system control method and parallel inverter system

A technology of inverter system and controller, which is applied in the direction of control/regulation system, adjustment of electric variables, conversion of DC power input into DC power output, etc. Problems such as output parallel operation to achieve the effect of increasing available occasions and suppressing DC circulation

Active Publication Date: 2021-02-12
ECOFLOW TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of inconsistent DC bus voltage, the DC circulating current cannot be eliminated even if the non-ideal factors of the inverter system itself are not considered
In systems that do not share the DC bus, the existence of DC circulation often leads to excessive DC bus voltage, resulting in damage to the DC side bus capacitor
[0005] Therefore, the application scenarios of parallel connection of inverter systems are often limited to the occasions where DC busbars (micro-grids) must be connected in parallel, or the situation where the voltage level of DC busbars inside different inverter systems must be guaranteed to be basically the same, which leads to different manufacturers or It is basically impossible for different models of products to achieve parallel operation with AC output

Method used

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  • Inverter system, inverter system control method and parallel inverter system
  • Inverter system, inverter system control method and parallel inverter system
  • Inverter system, inverter system control method and parallel inverter system

Examples

Experimental program
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Embodiment 1

[0067] Please refer to figure 1 In this embodiment, an inverter system 100 is proposed, and the inverter system 100 is mainly used to convert the input of the connected power into the output of the AC power, so as to provide the AC power for the AC load. like figure 1 As shown, the inverter system 100 of the present embodiment can be applied to an AC parallel system. The AC parallel system connects multiple inverter systems 100 in parallel on the AC side, that is, connects the load through a shared AC bus.

[0068] In this embodiment, the inverter system 100 has a two-stage conversion circuit structure. Exemplarily, as figure 1 As shown, the inverter system 100 includes a pre-stage conversion circuit 10, a post-stage conversion circuit 20 and a control circuit 30, wherein the input end of the pre-stage conversion circuit 10 is used to connect the power supply, and the output end of the pre-stage conversion circuit 10 is connected to the post-stage conversion circuit 20. The...

Embodiment 2

[0104] Please refer to figure 1 and 2 , based on the inverter system 100 of the above-mentioned Embodiment 1, this embodiment proposes a control method for an inverter system, exemplarily, such as figure 1 As shown, the inverter system 100 includes a pre-stage conversion circuit 10, a post-stage conversion circuit 20 and a control circuit 30. The input end of the pre-stage conversion circuit 10 is used to connect the power supply, the output end is connected to the post-stage conversion circuit 20, and the signal control end The output end of the control circuit 30 is connected; the input end of the post-stage conversion circuit 20 is connected to the output end of the former-stage conversion circuit 10 , the output end is used to connect the AC load, and the signal control end is connected to the output end of the control circuit 30 . Wherein, the front-stage conversion circuit 10 is used to convert the voltage of the power supply into a DC voltage and output it to the back-...

Embodiment 3

[0112] Please refer to figure 1 This embodiment also proposes a parallel inverter system, which can be applied to different occasions such as a mobile energy storage power supply with multiple batteries in parallel, a UPS parallel system, or a distributed microgrid power generation system.

[0113] Exemplarily, the parallel inverter system may include a plurality of inverter systems, wherein the AC output terminals of each inverter system are connected in parallel, and output AC power through a common AC bus, such as figure 1shown. In this embodiment, each inverter system will use the inverter system 100 in the above-mentioned Embodiment 1, and some optional options are also applicable to this embodiment.

[0114] like figure 2 As shown, during the inverter control process, the control circuit 30 of each inverter system 100 can be used to detect the DC component at the output end of the subsequent-stage conversion circuit 20, and make a difference between the zero value and...

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Abstract

The embodiment of the invention provides an inverter system, an inverter system control method and a parallel inverter system. The inverter system comprises a pre-stage conversion circuit, a post-stage conversion circuit and a control circuit, wherein the pre-stage conversion circuit is used for converting power supply voltage into direct-current voltage and outputting the direct-current voltage to the post-stage conversion circuit, and the voltage between the pre-stage conversion circuit and the post-stage conversion circuit is direct-current bus voltage; the post-stage conversion circuit isused for outputting alternating current; and the control circuit is used for detecting the direct current component of the output end of the post-stage conversion circuit, subtracting the direct current component from the zero value to obtain a direct current component deviation value, and carrying out PI adjustment on the direct current component deviation value to obtain a voltage compensation value, and the voltage compensation value is used for adjusting the direct current bus voltage. In an alternating current parallel operation system, the inverter system can effectively inhibit generated direct current circulation, and allows parallel operation with other inverter systems of different specifications or manufacturers and the like.

Description

technical field [0001] The present application relates to the field of power supply technology, and in particular to an inverter system, an inverter system control method, and a parallel inverter system. Background technique [0002] The capacity of the power supply device of a single inverter system is limited, and the parallel connection technology of the inverter system can increase the capacity of the power supply and improve the reliability of power supply. The parallel system (also known as AC parallel system) in which the inverter system outputs AC can be divided into two types according to the input conditions, that is, the AC parallel system that shares the DC bus and the AC parallel system that does not share the DC bus. However, both types of AC parallel systems will have the problem of DC circulating current. [0003] For example, in an AC parallel system with a shared DC bus, due to non-ideal factors such as switching speed, saturation voltage drop, dead time, ...

Claims

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Application Information

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IPC IPC(8): H02M7/493H02M3/00H02J3/38
CPCH02M7/493H02M3/00H02J3/38H02M1/0067H02M3/158H02M1/007H02M7/53871H02M7/4803
Inventor 王雷陈熙钱泓裕
Owner ECOFLOW TECH LTD