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A combined three-phase inverter power supply based on pr inner loop control

A three-phase inverter, combined technology, applied in the direction of converting irreversible DC power input to AC power output, electrical components, output power conversion devices, etc., can solve the mutual coupling and steady-state characteristics of three-phase inverter power supply. It is difficult to take into account the problems of and dynamic characteristics, and achieve the effect of accurate and fast short-circuit current limiting capability, fast dynamic response, and fast inner loop response speed.

Active Publication Date: 2018-05-11
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems that the three-phase inverter power supply phases are coupled to each other, and the steady-state characteristics and dynamic characteristics are difficult to balance

Method used

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  • A combined three-phase inverter power supply based on pr inner loop control
  • A combined three-phase inverter power supply based on pr inner loop control
  • A combined three-phase inverter power supply based on pr inner loop control

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Embodiment 1

[0044] The present invention will be further described below in conjunction with accompanying drawing.

[0045] like figure 1 As shown, the combined three-phase inverter power supply based on the PR inner loop control of the present invention includes a DC filter circuit 1 for filtering the DC voltage, a three-phase independent A (BC) phase bridge high-frequency modulation circuit 2, A three-phase independent A (BC) phase AC filter circuit 3, a sensor group 4 for respectively collecting three-phase output voltage and output current, and an isolated three-phase transformer 5.

[0046]The invention performs independent dual-loop control based on PR current inner loop control and PI voltage outer loop control under virtual synchronous rotating coordinate system for each phase. The control module of each phase includes an independent virtual static-synchronous rotation transformation operator 6, a voltage D-axis PI operator 7, a voltage Q-axis PI operator 8, a synchronous-static ...

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PUM

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Abstract

The invention discloses a combined three-phase inverter power supply based on PR inner loop control. The combined three-phase inverter power supply includes: a DC filter circuit for filtering DC voltage, an ABC three-phase independent bridge high Frequency modulation circuit, ABC three-phase independent AC filter circuit, sensor group for collecting three-phase output voltage and output current, isolated three-phase transformer, and independent three-phase control circuit. The combined three-phase inverter power supply of the present invention adopts a double-loop control structure, the outer loop adopts the output AC voltage PI control under the virtual synchronous rotating coordinate system, and the inner loop adopts the output current PR control. Compared with the existing inverter power supply, the present invention realizes completely independent control of three-phase AC, can maintain three-phase voltage balance under extremely unbalanced load, has low steady-state harmonic distortion rate, and dynamic response under sudden load conditions high speed.

Description

technical field [0001] The invention relates to a DC-AC power conversion device, in particular to a three-phase inverter power supply based on PR inner loop control. Background technique [0002] The inverter power supply can convert the DC system to the AC system and provide various AC power with good quality. With the improvement of social and industrial needs, the demand for inverter power is getting higher and higher. Due to the limitation of the performance of switching devices used in high-power inverters, the switching frequency is limited, and the control performance will be greatly restricted. However, another On the one hand, as the diversity of industrial loads increases, load switching and switching in independent AC power grids become more frequent, and the stability of the output voltage of the inverter power supply, the rapid response capability under various large load switching, and the stability under harsh unbalanced loads High requirements are put forwar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M1/12H02M7/525H02M7/539
CPCH02M1/12H02M7/48H02M7/525H02M7/539H02M1/0003
Inventor 李锐蔡凯吴浩伟李鹏李小谦邓磊欧阳晖姚川姜波李可维周樑金惠峰邢贺鹏李兴东徐正喜陈涛魏华雷秉霖张辉睿
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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