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Sliding mode control method of three-level NPC converter

A control method and converter technology, applied in the direction of converting AC power input to DC power output, electrical components, power transmission AC network, etc., can solve the problems of measurement noise sensitivity and large chattering

Active Publication Date: 2021-09-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing observer-based sliding mode control of the three-level NPC converter has large chattering and is very sensitive to measurement noise, and provides a sliding mode control method for the three-level NPC converter

Method used

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  • Sliding mode control method of three-level NPC converter
  • Sliding mode control method of three-level NPC converter
  • Sliding mode control method of three-level NPC converter

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specific Embodiment approach 1

[0078] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the sliding mode control method of a kind of three-level NPC converter described in this embodiment, this method is:

[0079] Using the DC voltage regulation loop, using the actual value of the DC side voltage v of the three-level NPC converter dc and DC link voltage reference Obtain the active power reference value p of the DC side at the current sampling point through the adaptive sliding mode controller * ;

[0080] The instantaneous power tracking loop is used to use the active power reference value p of the DC side at the current sampling point * , active power actual value p, reactive power actual value q and preset reactive power reference value q * , through the second-order sliding mode controller, the average duty cycle number δ of the three-level NPC converter is obtained αβ ;

[0081] The average duty cycle of the three-level NPC converter δ αβPerform αβ / ab...

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Abstract

The invention discloses a sliding mode control method for a three-level NPC converter, belongs to the technical field of power electronic control, and aims to solve the problems of large buffeting and high sensitivity to measurement noise due to the fact that a three-level NPC converter adopts an existing sliding mode control based on an observer. The sliding mode control method comprises the following steps of: acquiring an active power reference value p * of a load at a current sampling point moment by adopting a direct-current voltage adjusting loop; acquiring the average duty ratio number delta alpha beta of the three-level NPC converter by adopting an instantaneous power tracking loop; adopting a voltage balance loop to obtain a balance duty ratio delta ba; and after adding the balance duty ratio delta ba and the average duty ratio delta'abc of the level NPC converter, obtaining a three-level NPC converter switch tube control signal through a pulse width modulator, thereby achieving control over the three-level NPC converter. The method is suitable for controlling the three-level NPC converter.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and in particular relates to a sliding mode control method of a three-level NPC converter. Background technique [0002] In the past few decades, many multilevel power converter topologies have been proposed to meet the needs of medium and high voltage applications. The three-level neutral point clamped (NPC) power converter was first proposed in 1979 as a high-performance and low-loss multilevel power converter. Compared with traditional two-level converters, NPC power converters have the advantages of higher voltage levels and better output voltage waveforms. It is now well established in several medium and high voltage industrial applications such as active front ends or variable speed drives. For example, DC microgrids (MG), photovoltaic power generation, wind turbines, motor drives and energy storage systems, etc. [0003] At present, there are many control methods used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/155H02M1/088H02M1/12H02J3/38H02J3/36H02J3/01
CPCH02M7/155H02M1/088H02M1/12H02J3/38H02J3/36H02J3/01Y02E60/60Y02E40/40
Inventor 吴立刚刘健行孙光辉沈肖宁殷允飞高亚斌姚蔚然
Owner HARBIN INST OF TECH
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