Unlock instant, AI-driven research and patent intelligence for your innovation.

NPC three-level converter direct power control method based on vector influence tables

A power control and converter technology, applied in the field of power converter control

Active Publication Date: 2014-02-19
TIANJIN UNIV
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to improve the shortcomings of traditional direct power control, and at the same time, in order to solve some special problems such as the balance of the midpoint potential due to the particularity of the three-level voltage converter topology, a NPC three-level voltage is proposed direct power control method
According to the direct power control, the present invention proposes a direct power control method to solve the midpoint potential balance problem of the NPC three-level voltage type converter through the look-up table method, which can effectively eliminate the DC side voltage midpoint while ensuring fast and accurate tracking of the power. Fluctuation of point potential

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • NPC three-level converter direct power control method based on vector influence tables
  • NPC three-level converter direct power control method based on vector influence tables
  • NPC three-level converter direct power control method based on vector influence tables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0051] The present invention aims at improving the shortcomings of the traditional direct power control, and at the same time, in order to solve some special problems such as the balance of the midpoint potential due to the particularity of the topology of the three-level voltage type converter, the present invention is based on direct power Control proposes a direct power control method to solve the midpoint potential balance problem of NPC three-level voltage-type converter through the look-up table method, which can effectively eliminate the fluctuation of the midpoint potential of the DC side voltage while ensuring fast and accurate power tracking. Implementation method of the present invention comprises following three aspects:

[0052] (1) Establish the influence relationship of the space voltage vector of the voltage-type converter on t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of power converter control, and relates to an NPC three-level converter direct power control method based on vector influence tables. The method includes the following steps that the vector influence table for visually displaying the influence relation of space voltage vectors on active power and reactive power is built; the vector influence table for visually displaying the influence relation of the space voltage vectors on midpoint electric potential offset is built; according to the built vector influence tables, an optimal switch combination is screened and used for controlling the three-level voltage type converter. According to the NPC three-level converter direct power control method, fluctuation of voltage midpoint electric potential on a direct current side can be effectively eliminated while the power can be rapidly and accurately traced.

Description

Technical field [0001] The invention relates to a direct power control method of an NPC three-level voltage type converter, belonging to the field of power converter control. Background technique [0002] Neutral point clamped (NPC) three-level voltage source converter has been widely used in high-power applications and other occasions due to its advantages such as low pressure of switching devices and small dv / dt. The high-performance control strategies of three-level voltage-type converters mainly include vector control and direct power control (DPC), which correspond to vector control and direct torque control of motor control respectively. Among them, direct power control (direct power control, DPC) has the characteristics of simple algorithm and fast dynamic response, and can realize fast and efficient control of the active power and reactive power exchanged between the voltage source converter and the grid. There are two main types of traditional direct power control ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M7/483
Inventor 夏长亮徐哲赵家欣
Owner TIANJIN UNIV