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A sliding mode control method for 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 problems such as large chattering vibration and sensitivity to measurement noise

Active Publication Date: 2022-01-07
HARBIN INST OF TECH
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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

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  • A sliding mode control method for three-level npc converter
  • A sliding mode control method for three-level npc converter
  • A sliding mode control method for 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

A sliding mode control method for a three-level NPC converter, which belongs to the technical field of power electronics control, solves the problem that the three-level NPC converter adopts the existing observer-based sliding mode control, which has large chattering and is very sensitive to measurement noise question. The present invention adopts the DC voltage regulation loop to obtain the active power reference value p of the load at the current sampling point * ; Use the instantaneous power tracking loop to obtain the average duty cycle number δ of the three-level NPC converter αβ ;Using a voltage balance loop to obtain a balanced duty cycle δ ba ; for the balance duty cycle δ ba Sum level NPC converter average duty cycle δ′ abc After the addition, the switching tube control signal of the three-level NPC converter is obtained through the pulse width modulator, so as to realize the control of the three-level NPC converter. The invention is suitable for the control of three-level NPC converters.

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 Patents(China)
IPC IPC(8): H02M7/155H02M1/088H02M1/12H02J3/38H02J3/36H02J3/01
CPCH02M7/155H02M1/088H02M1/12H02J3/38H02J3/36H02J3/01Y02E60/60Y02E40/40
Inventor 刘健行沈肖宁赵悦林欣魄高亚斌殷允飞孙光辉姚蔚然
Owner HARBIN INST OF TECH
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