Controlling method for three-phase voltage type grid inverter

A three-phase voltage and control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of low-frequency oscillation tracking accuracy and drop, and achieve the improvement of bus voltage utilization , Suppress low-frequency oscillation phenomenon, improve the effect of grid-connected power quality

Active Publication Date: 2013-09-25
苏州四方智电能源科技有限公司
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Problems solved by technology

[0004] The present invention is based on the digital control technology of the converter, and aims at the problems of low-frequency oscillation of 1/6 switching frequency and decreased tracking accuracy caused by the delay of the sampling channel and the control process during the specific implementation process of the traditional deadbeat control , put forward an improved algorithm to improve stability and control accuracy, combined with a p

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  • Controlling method for three-phase voltage type grid inverter
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  • Controlling method for three-phase voltage type grid inverter

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Embodiment Construction

[0064] The specific implementation of the control method designed in the present invention will be described in detail below in conjunction with a battery energy storage system. as attached Figure 9 In the two-stage battery energy storage converter shown in , the front-stage Boost circuit completes the step-up and power control, and the rear-stage three-phase voltage-type PWM inverter performs double-closed-loop control on the output current to maintain the stability of the DC bus voltage. Control grid-connected current waveform and power factor.

[0065] The electrical quantities that need to be collected in real time during the working process of the inverter include: DC bus voltage U DC , grid voltage u ab , u bc , u ca , output current i a i b i c , at the beginning of each control cycle, the control system triggers AD to complete sampling, and the sampling start time t 1 and channel delay t 2 It is calculated in advance according to the software settings and har...

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Abstract

The invention discloses a digital controlling method of a three-phase voltage type grid inverter. The controlling method for the three-phase voltage grid inverter is based on the thought of a traditional dead beat technology, and comprises the steps of voltage predication, current predication, dead-time compensation and zero-sequence current injection improvement. The controlling method for the three-phase voltage grid inverter solves the problem that digital achievement of traditional dead-time controlling is poor in stability and tracing accuracy, wherein the problem is caused by the sampling channel and the delay of the calculation process and 'one-step-delay' control.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to the control technology of three-phase voltage type grid-connected converters. Background technique [0002] With the development of power electronics technology and distributed energy application technology, grid-connected converters, as the basic interface unit for distributed energy grid-connected, have broad application prospects. There are many kinds of grid-connected converters and their control methods. In order to meet the requirements of power quality, voltage-type converters have become the mainstream. Among the control methods of voltage-type grid-connected converters, most of them adopt double closed-loop direct current control technology. , has the advantages of good tracking effect and no static error. [0003] The deadbeat current control technology is one of many current control technologies. It has the outstanding advantages of convenient digi...

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Application Information

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IPC IPC(8): H02M7/5387
Inventor 梅红明刘建政
Owner 苏州四方智电能源科技有限公司
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