[1]焦京海.一种基于桥臂电流预测的死区补偿方法[J].控制与信息技术(原大功率变流技术),2019,(05):43-47.[doi:10.13889/j.issn.2096-5427.2019.05.010]
 JIAO Jinghai.A Dead Time Compensation Method Based on Inverter Bridge Current Prediction[J].High Power Converter Technology,2019,(05):43-47.[doi:10.13889/j.issn.2096-5427.2019.05.010]
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一种基于桥臂电流预测的死区补偿方法()
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《控制与信息技术》(原《大功率变流技术》)[ISSN:2095-3631/CN:43-1486/U]

卷:
期数:
2019年05期
页码:
43-47
栏目:
电力与传动控制
出版日期:
2019-10-05

文章信息/Info

Title:
A Dead Time Compensation Method Based on Inverter Bridge Current Prediction
文章编号:
2096-5427(2019)05-0043-05
作者:
焦京海
(中车青岛四方机车车辆股份有限公司,山东青岛 266111)
Author(s):
JIAO Jinghai
( CRRC Qingdao Sifang Co., Ltd., Qingdao, Shandong 266111, China )
关键词:
电流预测死区补偿低频小电流PWM逆变器
Keywords:
current prediction dead time compensation small current with low frequency PWM inverter
分类号:
TM464
DOI:
10.13889/j.issn.2096-5427.2019.05.010
文献标志码:
A
摘要:
PWM技术中死区效应是引发逆变器谐波的重要因素之一。传统的基于脉冲的死区补偿方法是在判断桥臂电流极性的基础上,对脉冲移相实施死区解耦控制;而实际应用中数字控制器存在一定的延时,且当逆变器工作在低频小电流工况下时,桥臂电流在一个开关周期内可能存在多次零点穿越的情况,因此难以精确判断桥臂电流过零点,可能会导致死区的误补偿。对此,文章在分析了死区效应的机理及其对输出电压和电流的影响的基础上,提出了一种基于桥臂电流预测的死区补偿方法,其在每个开关周期内对桥臂电流采样一次;同时结合逆变器模型,在整个开关周期内对桥臂电流进行迭代计算以得到全开关周期桥臂电流,再结合传统死区补偿方法来实现精确补偿。Simulink仿真结果显示采用该方法能够有效减小死区时间造成的谐波,验证了该方法的有效性。
Abstract:
Deod-time effect in PWM technology is one of the important factors causing harmonics in inverters. Traditional pulse-based dead time compensation method needs to shift pulse phase according to the polarity of inverter bridge current. However, the digital controller has a certain delay. In addition, when the inverter operates in a low frequency with small current, inverter bridge current may have multiple zero crossings in one switching cycle. These factors make it difficult to determine the zero crossings of the inverter bridge current and may result in the false dead time compensation. This article analyzed the mechanism of dead time effect and its influences on the output voltage and current. Then, a dead time compensation method based on inverter bridge current prediction was proposed. The inverter bridge current is iteratively calculated throughout the switching cycle. Combined with the traditional dead time compensation method, dead time compensation is achieved. Simulink simulation results verify that the proposed method can reduce the harmonics caused by dead time effectively.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2019-06-10
作者简介:焦京海(1971—),男,高级工程师,主要从事电气控制技术研究。
更新日期/Last Update: 2019-10-23