ANPC type three-level inverter, control method and power system

A technology of three-level inverter and control method, which is applied in high-efficiency power electronic conversion, electrical components, photovoltaic power generation, etc., can solve problems such as overvoltage damage of switching tubes, and achieve the goal of preventing overvoltage damage and shortening the commutation path Effect

Active Publication Date: 2021-06-25
双一力(宁波)电池有限公司
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Problems solved by technology

[0003] However, when the switching tube is turned off, the switching tube will withstand a peak voltage exceeding the voltage stress range due to the long commutation circuit, resulting in overvoltage damage to the switching tube

Method used

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  • ANPC type three-level inverter, control method and power system
  • ANPC type three-level inverter, control method and power system
  • ANPC type three-level inverter, control method and power system

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Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below with reference to the drawings. When the description refers to the drawings, the same reference numerals in different drawings indicate the same or similar elements unless otherwise indicated. It should be noted that the implementations described in the following exemplary embodiments do not represent all implementations of the present invention. They are merely examples of apparatus and methods consistent with certain aspects of the present disclosure as recited in the claims, and the scope of the present invention is not limited thereto. On the premise of no contradiction, the features in the various embodiments of the present invention can be combined with each other.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical feature...

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Abstract

The invention provides an ANPC type three-level inverter, a control method and a power system, and relates to the technical field of inverter control, in the ANPC type three-level inverter, in a calibration time, no current flows through a first switch tube and a fourth switch tube in an electrically disconnected state, so the first switch tube and the fourth switch tube cannot be damaged due to overvoltage, and when at least one of the second switch tube and the third switch tube is switched from the electrical conduction state to the electrical disconnection state, a short commutation path passing through the fifth diode, the second switch tube, the third diode and the sixth switch tube is formed, or/and a short commutation path passing through the fifth diode, the second switch tube, the third diode and the sixth switch tube is/are formed when at least one of the second switch tube and the third switch tube is switched from the electrical conduction state to the electrical disconnection state; or a short commutation path passing through the third switch tube, the sixth diode, the fifth switch tube and the second diode is formed, a commutation path is shortened, and at least one of the second switch tube and the third switch tube is prevented from being damaged due to overvoltage.

Description

technical field [0001] The invention relates to the technical field of inverter control, in particular to an ANPC type three-level inverter, a control method and a power system. Background technique [0002] ANPC (Active Neutral-point-clamped) type three-level inverter includes a circuit composed of two capacitors, six switch tubes and six diodes, through which three Level, the three levels are high level V / 2, zero level 0V and low level -V / 2. Compared with two-level inverters, ANPC type three-level inverters have output The voltage and current harmonics are small and the voltage and switching losses borne by switching devices are halved. [0003] However, when the switch tube is turned off, the switch tube will bear a peak voltage exceeding the voltage stress range due to a long commutation circuit, resulting in overvoltage damage to the switch tube. Contents of the invention [0004] The present invention aims to solve the technical problems in related technologies at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487
CPCH02M7/487Y02E10/56
Inventor 王振存熊俊峰边博伟
Owner 双一力(宁波)电池有限公司
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