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Fault-tolerant control method and system for three-phase four-leg grid-connected inverter

A three-phase four-leg, fault-tolerant control technology, applied in the field of current conversion, can solve the problem that the IGBT non-faulty phase cannot provide power injection to the system, achieve simple and effective control strategy, improve operation reliability, and realize fault-tolerant control.

Active Publication Date: 2021-11-16
GUANGDONG ZHICHENG CHAMPION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a three-phase four-arm grid-connected inverter fault-tolerant control method and system to solve The problem that the non-faulty phase cannot provide power injection to the system when there is an IGBT fault in one phase bridge arm or two phase bridge arms

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  • Fault-tolerant control method and system for three-phase four-leg grid-connected inverter
  • Fault-tolerant control method and system for three-phase four-leg grid-connected inverter

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Embodiment Construction

[0044] The fault-tolerant control strategy disclosed in the present invention can realize the three-phase four-arm grid-connected inverter in the Figure 2(a) ~ Figure 2(c) The stable operation under the three fault conditions shown are respectively the fourth bridge arm fault working mode, the ABC phase single-phase bridge arm fault working mode and the ABC phase two-phase bridge arm fault working mode. The specific implementation methods are as follows:

[0045] S1. For the three-phase four-arm grid-connected inverter ABC three-phase current and the fourth arm current i cx , load current i Lx , common coupling point voltage v x Take a sample.

[0046] S2. In the fault-free state of the three-phase four-leg grid-connected inverter, according to the instantaneous power theory, the active power reference value p ref and reactive power reference q ref Calculate the inverter three-phase current and the reference value of the fourth bridge arm current:

[0047] When the three...

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Abstract

The invention discloses a fault-tolerant control method and system for a three-phase four-bridge-arm grid-connected inverter. A non-fault phase bridge arm is controlled to provide power for the system under the condition that the three-phase four-bridge-arm grid-connected inverter has a fourth bridge arm single-phase IGBT fault and an ABC phase bridge arm single-phase or two-phase IGBT fault, and cannot provide power for the system. With adoption of the method, the non-fault phase bridge arm can continuously operate under the condition that the IGBT of the one-phase or two-phase bridge arm has a fault, so that the reliability of a power grid system is improved.

Description

technical field [0001] The invention relates to the field of current conversion technology in electrical engineering, in particular to a fault-tolerant control method and system for a three-phase four-arm grid-connected inverter. Background technique [0002] Such as figure 1 As shown, the three-phase four-leg grid-connected inverter includes a photovoltaic part, an inverter main circuit part, and a filter inductor part; the photovoltaic part is used to maintain the DC side voltage of the inverter; the inverter main circuit includes ABC phase three-phase Bridge arm and the fourth bridge arm, each bridge arm includes upper and lower IGBT T x , Filter inductance L x One end is connected to the inverter, and the other end is connected in parallel between the grid and the load. x = a, b, c, n. [0003] Three-phase four-leg inverters have been widely researched and applied in new energy grid-connected, active filtering, uninterruptible power supplies and other fields, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/5387H02M7/493H02J3/38
CPCH02M1/32H02M7/53871H02M7/493H02J3/38H02J3/381H02J2300/24Y02E10/56
Inventor 王雷张凯何志兴周小平徐千鸣高兵周骞戴瑜兴陈宇
Owner GUANGDONG ZHICHENG CHAMPION GROUP