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Current double-loop control method based on repetitive pr control for three-phase lcl type grid-connected inverter

A double-loop control and inverter technology, applied to AC network circuits, electrical components, circuit devices, etc., can solve the problems of increasing system costs, not being able to suppress high-frequency harmonics well, increasing the volume of photovoltaic power generation systems, etc., to achieve suppression Resonant peak, effect of maintaining stability

Active Publication Date: 2018-11-30
WUXI POWER SUPPLY JIANGSU PROVINCE ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices can suppress harmonics to a certain extent, but increase the volume of the entire photovoltaic power generation system and increase the system cost
2. Add an L-type or LC-type filter on the AC side of the inverter, but it cannot suppress high-frequency harmonics well

Method used

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  • Current double-loop control method based on repetitive pr control for three-phase lcl type grid-connected inverter
  • Current double-loop control method based on repetitive pr control for three-phase lcl type grid-connected inverter

Examples

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with drawings and embodiments.

[0014] figure 1 Shown is the LCL type grid-connected inverter topology. In the figure i d Output DC current for photovoltaic panels, C 1 is the input DC bus filter capacitor, VT 1 ~VT 6 6 IGBT switch tubes of the three-phase inverter bridge, the filter inductor L 1 , filter capacitor C 2 , filter inductance L 2 Form a third-order LCL filter. The filter plays an important role in the grid-connected inverter. It converts the switching pulse voltage and current generated by the inverter bridge into a continuous analog quantity, suppresses the excessive fluctuation and surge impact of the output current, and converts the harmonics generated by the switching action. The wave current component is filtered out, through which the amplitude and phase of the grid-connected current can be controlled, so as to control the power output of the grid-connected inverter. C 2 a...

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Abstract

The invention discloses a current double-loop control method based on repeated PR control for a three-phase LCL grid connected inverter. The method comprises a capacitive current feedback control link and a grid connected current control link. The grid connected current outer loop uses repeated PR regulator control and is used for performing high-performance control on the grid connected current. The capacitive current inner loop uses PI regulator control. The output of an inner loop regulator is modulated by SPWM and then drives the operation of the six IGBT switch tubes of a three-phase inverter bridge. The current double-loop control method achieves high-performance control on the grid connected inverter, suppresses the resonance peak of a LCL grid connected filter, and maintains system stability.

Description

technical field [0001] The invention relates to a current double-loop control method based on repeated PR control of a three-phase LCL type grid-connected inverter, which belongs to the technical field of power electronics. Background technique [0002] Today's large-scale distributed photovoltaic grid connection has alleviated the power consumption pressure to a certain extent, but the harmonics generated by photovoltaic inverters will have a considerable impact on the power system: it will make the power system equipment aging and shorten the life, and the electronic communication The interference of the equipment leads to distortion, the interference to the protection device causes malfunction, and the power quality drops. Therefore, it is necessary to effectively suppress the harmonics output by the photovoltaic inverter. [0003] At present, the main ways of harmonic control are 1. By adding harmonic compensation devices outside the photovoltaic inverter: shunt capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01H02J3/38H02J3/383Y02E10/56Y02E40/40
Inventor 陈铭沈海平李珉汤铮崔国华王璟顾江邱巍李立董震威张之豪
Owner WUXI POWER SUPPLY JIANGSU PROVINCE ELECTRIC POWER
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