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

An inverter system and controller technology, which is applied in the control/regulation system, regulating electrical variables, converting DC power input into DC power output, etc., can solve the problem of DC side bus capacitor damage, high DC bus voltage, and impossible to achieve AC Output parallel operation and other problems, to increase the available occasions and suppress the effect of DC circulating current

Active Publication Date: 2021-04-02
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

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Effect test

Embodiment 1

[0067] Please refer to figure 1 , this embodiment proposes an inverter system 100, the inverter system 100 is mainly used to convert the connected power input into an AC output, so as to provide AC loads with AC power. Such as figure 1 As shown, the inverter system 100 of this embodiment can be applied to an AC parallel system. The AC parallel system outputs multiple inverter systems 100 in parallel on the AC side, that is, connects loads 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 front-stage conversion circuit 10, a rear-stage conversion circuit 20, and a control circuit 30, wherein the input terminal of the front-stage conversion circuit 10 is used to connect to a power supply, and its output terminal is connected to the rear-stage conversion circuit 20. The signal control terminal is connected to the output terminal of 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 an inverter system control method. Exemplarily, as figure 1 As shown, the inverter system 100 includes a front-stage conversion circuit 10, a rear-stage conversion circuit 20, and a control circuit 30. The input terminal of the front-stage conversion circuit 10 is used to connect to a power supply, and the output terminal is connected to the rear-stage conversion circuit 20 and a signal control terminal. Connect 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 rear-stage conversion circuit 20; the DC voltage between the front-stage conversion circuit 10 and the rear-stage conversion circuit 20 is a DC bus voltage; The subsequent conversion circuit 20 is used to convert the DC bus voltage into an AC voltage.

[010...

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 parallel batteries, a UPS parallel system, or a distributed micro-grid power generation system.

[0113] Exemplarily, the parallel inverter system may include multiple 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 Embodiment 1 above, and some optional items are also applicable to this embodiment.

[0114] Such as 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 of the output terminal of the subsequent conversion circuit 20, and make a difference between the zero value and the DC component to...

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Abstract

Embodiments of the present application provide an inverter system, an inverter system control method, and a parallel inverter system. The inverter system includes a front-stage conversion circuit, a rear-stage conversion circuit, and a control circuit; the front-stage conversion circuit is used to convert the power supply voltage It is a DC voltage and output to the rear conversion circuit, the voltage between the front conversion circuit and the rear conversion circuit is the DC bus voltage; the rear conversion circuit is used to output alternating current; the control circuit is used to detect the output of the rear conversion circuit. DC component, and make a difference between the zero value and the DC component to obtain the DC component deviation value, and perform PI adjustment on the DC component deviation value to obtain a voltage compensation value, which is used to adjust the DC bus voltage. In an AC parallel system, the inverter system of the present application can effectively suppress the generated DC circulation, and also allow parallel operation with other inverter systems of different specifications or manufacturers.

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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Patent Type & Authority Patents(China)
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