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Single-phase inverter capable of suppressing secondary ripple and common-mode leakage current and its control method

A single-phase inverter and control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of lack of common mode leakage current suppression capability and DC side voltage utilization rate Low, underutilized decoupling filter capacitors, etc.

Active Publication Date: 2021-04-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods either do not make full use of the capacity of the decoupling filter capacitor, or have no common-mode leakage current suppression capability, or have low utilization of the DC side voltage

Method used

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  • Single-phase inverter capable of suppressing secondary ripple and common-mode leakage current and its control method
  • Single-phase inverter capable of suppressing secondary ripple and common-mode leakage current and its control method
  • Single-phase inverter capable of suppressing secondary ripple and common-mode leakage current and its control method

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Embodiment Construction

[0066] see figure 1 In this embodiment, the single-phase inverter capable of suppressing secondary ripple and common-mode leakage current includes a c-phase power decoupling circuit 1, an ab two-phase full-bridge inverter circuit 2, an AC low-pass output filter circuit 3 and a common Mode leakage current suppression circuit 4; wherein, ab two-phase full-bridge inverter circuit 2 includes a-phase bridge arm and b-phase bridge arm, c-phase power decoupling circuit 1 includes c-phase bridge arm, filter inductor L d and power decoupling filter capacitor C d .

[0067] like figure 1 As shown, the input ends of c-phase power decoupling circuit 1 and ab two-phase full-bridge inverter circuit 2 are connected in parallel, and share the DC input source V in ; The output end of the c-phase power decoupling circuit 1 is connected to the first input end of the AC low-pass output filter circuit 3; the AC output end of the ab two-phase full-bridge inverter circuit 2 is connected to the AC...

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Abstract

The invention discloses a single-phase inverter capable of suppressing secondary ripple and common-mode leakage current and a control method thereof. The single-phase inverter includes a c-phase power decoupling circuit and an ab two-phase full-bridge inverter circuit , AC low-pass output filter circuit and common-mode leakage current suppression circuit; c-phase power decoupling circuit and ab two-phase full-bridge inverter circuit input in parallel; c-phase power decoupling circuit output and AC low-pass output filter circuit The first input terminal is connected; the AC output terminal of the ab two-phase full-bridge inverter circuit is connected to the AC side v through the AC low-pass output filter circuit o Phase connection; the second output terminal of the AC low-pass output filter circuit is connected to the DC input source V through the common-mode leakage current suppression circuit in connected to the negative terminal of the common-mode leakage current; by introducing the pulsating power of twice the power frequency into the power decoupling filter capacitor, the secondary ripple suppression is realized, and there is no need to set a large-capacity electrolytic capacitor on the DC side , reduce the volume and loss of the inverter, and improve the power density and life of the inverter.

Description

technical field [0001] The invention relates to the technical field of single-phase inverters, and more specifically relates to a single-phase inverter with active power decoupling and common-mode leakage current suppression functions. The inverter is mainly used in AC microgrids, small in distributed power generation systems. Background technique [0002] Small-scale power generation systems mostly use single-phase power, so single-phase inverters are widely used in small-scale distributed power generation systems. For example, in a small photovoltaic power generation system, the DC side of the inverter is connected to the photovoltaic module, and the AC side is connected to the grid. Such a connection mode determines that the single-phase inverter must meet the requirements of both sides at the same time: under certain light conditions on the photovoltaic side, the photovoltaic module works at the maximum power point, the input power of the micro-inverter is constant; the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/14H02M1/12
CPCH02M1/12H02M1/14H02M7/53871H02M1/123
Inventor 茆美琴汪海军张榴晨
Owner HEFEI UNIV OF TECH