大功率交流电流源的关键问题及改进措施*

doi:10.11985/2020.03.011

电气工程学报 ›› 2020, Vol. 15 ›› Issue (3): 78-87.doi: 10.11985/2020.03.011

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大功率交流电流源的关键问题及改进措施^*

凌建¹(),郑欢²(),万琦珺¹(),赵哲²(),彭程²()

1.江苏送变电有限公司南京 210028
2.哈尔滨理工大学工程电介质及其应用教育部重点实验室哈尔滨 150080

收稿日期:2020-05-07 修回日期:2020-06-19 出版日期:2020-09-25 发布日期:2020-10-28
通讯作者: 郑欢 E-mail:jiallins@js.sgcc.com.cn;Huanzh@hrbust.edu.cn;wanqijun@js.sgcc.com.cn;3165514040@qq.com;516886391@qq.com
作者简介:凌建,男,1973年生,高级工程师。主要研究方向为电力系统及自动化技术。E-mail：jiallins@js.sgcc.com.cn|万琦珺,男,1973年生,高级工程师。主要研究方向为电力系统及自动化技术。E-mail：wanqijun@js.sgcc.com.cn|赵哲,男,1996年生,硕士研究生。主要研究方向为电力设备绝缘检测技术。E-mail：3165514040@qq.com|彭程,男,1996年生,硕士研究生。主要研究方向为电力设备绝缘检测技术。E-mail：516886391@qq.com
基金资助:
* 国网江苏省电力有限公司科技(J2019019)

Key Issues and Improvement of High Power AC Current Source

LING Jian¹(),ZHENG Huan²(),WAN Qijun¹(),ZHAO Zhe²(),PENG Cheng²()

1. Jiangsu Power Transmission and Transformation Co., Ltd., Nanjing 210028
2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080

Received:2020-05-07 Revised:2020-06-19 Online:2020-09-25 Published:2020-10-28
Contact: ZHENG Huan E-mail:jiallins@js.sgcc.com.cn;Huanzh@hrbust.edu.cn;wanqijun@js.sgcc.com.cn;3165514040@qq.com;516886391@qq.com

摘要/Abstract

摘要：

针对大截面导体交流电阻测试要求电源容量高和波形失真小的特点,提出一种基于PA52型功率放大器的交流电流源。依据改进型Howland电流泵的工作原理和桥式电路驱动技术设计电源主电路,该电源主电路由压控电流源和耦合变压器两部分组成。根据负载呈感性的特点设计压控电流源的保护和补偿电路。采用功率放大器的并联和耦合变压器等措施实现交流电流输出能力的提升,并对耦合变压器进行设计。结合理论分析和性能测试,验证了噪声增益补偿、功率放大器的并联扩流和耦合变压器升流等关键技术的可行性。

关键词: 交流电流源, 功率放大器, 耦合变压器, 频率特性

Abstract:

Aiming at the characteristics of high power capacity and small waveform distortion in AC resistance testing of large cross-section conductor, an AC current supply based on PA52 power amplifier is proposed. According to the working principle of the improved Howland current pump and bridge circuit driving technology, the main circuit of power supply is designed, which is composed of voltage control current source and coupling transformer. The protection and compensation circuits are designed according to the characteristics of inductive load. The output capacity of AC current source is improved by means of parallel power amplifier and coupling transformer, and the coupling transformer is designed. Combined with the theoretical analysis and performance measurement, the feasibility of key technologies such as noise gain compensation, power amplifier parallel current expansion and coupling transformer rising current are verified.

Key words: AC current source, power amplifier, coupling transformer, frequency characteristics

中图分类号:

TM561

凌建,郑欢,万琦珺,赵哲,彭程. 大功率交流电流源的关键问题及改进措施^*[J]. 电气工程学报, 2020, 15(3): 78-87.

LING Jian,ZHENG Huan,WAN Qijun,ZHAO Zhe,PENG Cheng. Key Issues and Improvement of High Power AC Current Source[J]. Journal of Electrical Engineering, 2020, 15(3): 78-87.

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参数	频率/Hz
参数	30	50	100	150	300
失真度THD(%)	0.461	0.516	0.484	0.499	0.389

参数	频率/Hz
参数	30	50	100	150	300
激磁电阻R_m/Ω	0.70	1.30	2.88	4.45	8.54
激磁电抗X_m/Ω	2.30	3.64	6.42	8.59	13.08
变压器激磁阻抗Z_m/Ω	2.41	3.87	7.03	9.67	15.62

参数	频率/Hz
参数	30	50	100	150	300
失真度THD (%)	0.387	0.388	0.349	0.304	0.352

大功率交流电流源的关键问题及改进措施^*

Key Issues and Improvement of High Power AC Current Source

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