A three-closed-loop control method for a full-bridge inverter in the island mode of a photovoltaic energy storage system

A full-bridge inverter and photovoltaic energy storage technology, which is applied in the directions of photovoltaic power generation, output power conversion device, AC power input conversion to DC power output, etc., can solve the problems of poor dynamic performance and stability performance, and improve dynamic performance. performance, improved steady-state accuracy, and the effect of improved accuracy

Active Publication Date: 2016-06-15
深圳市柏盛科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Commonly used single-closed-loop feedback control and double-closed-loop voltage-current control strategy inverter systems often have poor dynamic performance and stability

Method used

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  • A three-closed-loop control method for a full-bridge inverter in the island mode of a photovoltaic energy storage system
  • A three-closed-loop control method for a full-bridge inverter in the island mode of a photovoltaic energy storage system
  • A three-closed-loop control method for a full-bridge inverter in the island mode of a photovoltaic energy storage system

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Experimental program
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Embodiment Construction

[0017] see figure 1 It can be seen that the photovoltaic modules and battery packs of the photovoltaic energy storage system are connected to the DC bus through the photovoltaic side converter and the battery side converter respectively, the local load is connected to the DC bus through the full-bridge inverter, and the public grid is connected to the local load and the full-bridge inverter. Between the three converters, all three converters are connected to the common DC bus to form a DC microgrid. see figure 2 , 3 It can be seen that the inner loop of the full-bridge inverter is the inverter filter inductor current loop, the middle loop is the inverter output instantaneous voltage loop, and the outer loop is the effective value loop of the inverter output voltage.

[0018] see figure 2 It can be seen that the inverter filter inductor current loop control parameters are set as follows, and the current signal collected at the output of the full-bridge inverter is fed back...

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Abstract

The invention discloses a three-closed-loop control method for a full-bridge inverter in the island mode of a photovoltaic energy storage system. The invention proposes a three-loop closed-loop control strategy: the inner loop is the inverter filter inductor current loop, which improves the system The dynamic performance of the inverter; the middle ring is the inverter output instantaneous voltage ring, which improves the output voltage waveform and improves the steady-state accuracy; the outer ring is the inverter output voltage effective value ring, which improves the accuracy of the output voltage effective value. The whole three closed-loop control can effectively improve the voltage and current output quality of the single-phase full-bridge inverter.

Description

technical field [0001] The invention relates to the field of photovoltaic energy storage, in particular to a control method for a photovoltaic energy storage full-bridge inverter. Background technique [0002] The power converter in the photovoltaic energy storage system includes a photovoltaic side Boost inverter, a battery side Buck-Boost inverter and a load side full-bridge inverter. All three converters are connected across the common DC bus to form a DC microgrid. Due to the strict requirements on the quality of the output voltage and current fed by the inverter, the control strategy of the inverter is particularly important. Commonly used single-closed-loop feedback control and double-closed-loop voltage-current control strategy inverter systems often have poor dynamic performance and stability. Contents of the invention [0003] The technical problem to be solved by the invention is to realize a control method capable of improving the voltage and current output qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
CPCY02E10/56
Inventor 蔡旭姜广宇王海松叶程广罗天意
Owner 深圳市柏盛科技有限公司
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