摘要
电流变换器是对断路器保护特性进行在线测试的核心装置,现有的测试方法缺乏功率因数调节,并且在电流输出精度及稳定性方面有待提高。论文提出一种断路器保护特性测试电流的自适应控制策略,采用前级功率因数模糊控制补偿、后级负载阻抗自适应校正的两级闭环控制方法。对于前级功率因数补偿单元,在Sugeno型模糊控制电压信号中引入跟踪误差信号进行补偿,提升前级直流电压的跟踪能力;在后级电流输出端,采用离散采样积分的方法对负载阻抗自适应在线识别,并进行前馈补偿,提高电流输出精度。分别对功率因数校正和电流输出精度进行了仿真和实验对比,对比结果表明,相比于传统控制方案,该文提出的控制策略将测试电流误差从3%降至1.2%,THD最大降低比例达到17.1%,可有效减小波形失真,减少电网谐波污染。
Current converter is the core device to test the protection characteristics of circuit breaker. The existing test methods lack power factor adjustment. The current accuracy and stability also need to be improved. An adaptive control strategy for the circuit breaker testing application is proposed,in which a two-stage dual closed-loop control method is presented based on the front-stage fuzzy control and the post-stage impedance compensation. For the front-stage power factor compensation unit,the tracking error is introduced into the Sugeno-type fuzzy control to compensate the front-stage DC voltage tracking. At the post stage, a discrete impedance integration method is used to adaptively calculate the load impedance and an impedance compensation is then performed to improve current accuracy. The power factor correction and current accuracy are compared via both simulation and experiments. Comparison results show that compared with conventional method, the proposed strategy is able to reduce the current error from 3% to 1.2%. The maximum reduction ratio of THD is up to 17.1 %, which is significant to reduce the current distortion and grid harmonics.
作者
游颖敏
王景芹
舒亮
张海跟
陈冲
You Yingmin;Wang Jingqin;Shu Liang;Zhang Haigen;Chen Chong(State Key Laboratory for Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300130,China;Yueqing Institute of Industry Wenzhou University,Wenzhou 325000,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2020年第15期3203-3213,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51507113)
浙江省重点研发计划(2017C01008)
浙江省公益技术研究计划(LGC20E070001)
温州市重大科技专项(2018ZG020)
浙江省教育厅项目(Y201737046)资助。
关键词
断路器
功率因数校正
电流变换器
模糊控制
Circuit breaker
power factor correction
current converter
fuzzy control
