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Shutdown wave sealing control method of multi-level inverter circuit and application device thereof

A multi-level inverter and control method technology, applied in emergency protection circuit devices, output power conversion devices, irreversible DC power input conversion to AC power output, etc., can solve the problem of no clamping path, overvoltage, etc. question

Active Publication Date: 2020-01-03
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, due to the disconnection of the two clamping tubes T5 and T6, the two inner tubes T2 and T3 have no clamping path. If the characteristics of the switching tubes in the system are different, the series stress distribution of the two inner tubes T2 and T3 will be Large gaps after long periods of time and thus risk of overvoltage

Method used

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  • Shutdown wave sealing control method of multi-level inverter circuit and application device thereof
  • Shutdown wave sealing control method of multi-level inverter circuit and application device thereof
  • Shutdown wave sealing control method of multi-level inverter circuit and application device thereof

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0048] exist Figure 1aIn the shown ANPC topology, the AC side AC can theoretically output three states: Udc+, NP, and Udc-, which are represented by 1 state, 0 state, and -1 state respectively. Among them, in the 1 state, the switching tubes T3 and T4 are connected in series and bear the total bus voltage, and in the -1 state, the switching tubes T1 and T2 are connected in series and bear the total bus voltage. During normal operation, at least one clamping tube (T5, D5 and T6, D6) will be...

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Abstract

The invention provides a shutdown wave sealing control method of a multi-level inverter circuit and an application device thereof. After shutdown instruction issuing, a multi-level inverter circuit iscontrolled to be in a free state that each switching tube is switched off, and specific switching tubes are combined and closed, so that the switching tubes which are not subjected to clamping protection in the multi-level inverter circuit are switched between specific closed states in which the voltage stress borne by the switching tubes is zero so as to destroy difference accumulation of natural voltage division caused by inconsistent switching tube parameters when the switching tubes which are not subjected to clamping protection are in a free state. The method is advantaged in that by carrying out multiple times of back-and-forth switching control between a free state and a specific closed state, the voltage stress borne by the switching tubes which are not subjected to clamping protection is controlled within a controlled range, and the overvoltage risk possibly caused by the inconsistent switching tube parameters is reduced.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a shutdown wave sealing control method of a multi-level inverter circuit and an application device thereof. Background technique [0002] Figure 1a Shown is a bridge arm structure of the ANPC topology multi-level inverter circuit, including six switch tubes, namely: two inner tubes T2 and T3, two outer tubes T1 and T4, and two clamping tubes T5 and T6; and, each of the above switching tubes is equipped with an anti-parallel diode or body diode (such as Figure 1a D1 to D6 shown in). [0003] Controlled by the controller of the inverter to which it belongs, when the multi-level inverter circuit is converted from the working state to the stop state, it usually uses a certain switching logic to ensure that the current in the switch tube flows in the circuit in a controlled manner. , and bring a rapid drop in the loop current to protect the reliable shutdown of the system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/49H02M7/5387H02J3/38H02J3/18H02H7/122
CPCH02M7/487H02M7/49H02M7/53871H02J3/18H02H7/122H02M1/083Y02E10/56H02M7/5387H02M1/36
Inventor 庄加才徐君张兵文鹏王鹏
Owner SUNGROW POWER SUPPLY CO LTD
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