Commutation Algorithm for Three-Phase Unbalanced Load Regulation in Distribution Network

doi:10.11930/j.issn.1004-9649.201901104

Abstract

Abstract: Automatic phase commutation system is widely used to deal with the load imbalance problem in low voltage distribution network. It consists of an intelligent commutation terminal and a number of phase commutation switches. In the commutation switch, the compound switch of paralleled magnetic latching relay and bidirectional thyristor is selected as commutation switch actuator, in which the thyristor is cut off by zero switching at the moment of commutation, and the magnetic latching relay is switched on without large current. The hardware devices are generally used to detect the zero crossing point on the line voltage. As high frequency harmonic waves exist on the line voltage, the zero crossing point is hard to be detected accurately, and dedicated phase trigging can not be implemented using this method. Therefore, the software method is used to calculate the line voltage phase, and a reliable commutation algorithm is adopted to realize the regulation of three-phase imbalance, which effectively prevents the impact impulse to load and power grid, consequently improving the reliability in triggering thyristor. Experimental results show that the proposed algorithm is feasible in solving three-phase unbalanced loads and improving power supply quality.

Key words: three-phase imbalance, automatic commutation system, magnetic latching relay, bidirectional thyristor, commutation algorithm

LI Yongxia, GONG Yulei, GUO Xiuxiao, ZHAO Yanyan. Commutation Algorithm for Three-Phase Unbalanced Load Regulation in Distribution Network[J]. Electric Power, 2020, 53(3): 52-58.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201901104

https://www.electricpower.com.cn/EN/Y2020/V53/I3/52

References

[1] 田一焜. 农村低压电网三相负荷不平衡运行的危害及其防范措施[J]. 科技展望, 2014, 24(18): 28
[2] 廖坤玉, 陶顺, 姚黎婷, 等. 不平衡负荷负序加权等效模型及其平衡化补偿方法[J]. 中国电机工程学报, 2017, 37(19): 5594–5603, 5836
LIAO Kunyu, TAO Shun, YAO Liting, et al. Negative sequence weighted equivalent model of unbalanced load and its balance compensation method[J]. Proceedings of the CSEE, 2017, 37(19): 5594–5603, 5836
[3] 张明, 谢珊珊, 罗云峰. 低压配电网三相负荷不平衡优化模型的研究[J]. 武汉科技大学学报, 2015, 38(1): 59–62
ZHANG Ming, XIE Shanshan, LUO Yunfeng. Optimization model of the three-phase load imbalance in low voltage distribution network[J]. Journal of Wuhan University of Science and Technology, 2015, 38(1): 59–62
[4] 吕行. 低压三相不平衡调补装置的研究和设计[D]. 大连: 大连理工大学, 2014.
LU Hang. Low-voltage three-phase imbalance filling equipment research and design[D]. Dalian: Dalian University of Technology, 2014.
[5] 邹进. 基于DSP的低压三相不平衡无功补偿装置的研制[D]. 北京: 华北电力大学(北京), 2008.
ZOU Jin. Research on the unbalanced three-phase reactive power compensation device based on DSP for distribution networks[D]. Beijing: North China Electric Power University, 2008.
[6] CHOI J K. The design of a control & measurement system for the driving of wheel-in motor[J]. Journal of Korean Institute of Intelligent Systems, 2015, 25(4): 405–411.
[7] 张海鹏, 林舜江, 刘明波, 等. 低压配电网无功补偿及效益评估系统的开发和应用[J]. 电力系统保护与控制, 2016, 44(4): 129–131
ZHANG Haipeng, LIN Shunjiang, LIU Mingbo, et al. Development of low voltage distribution networks reactive power compensation and benefit assessment system and its application[J]. Power System Protection and Control, 2016, 44(4): 129–131
[8] 尹项根, 王祯, 陈玉, 等. 配电变压器集成化补偿系统的多目标分析及控制[J]. 电力系统保护与控制, 2018, 46(9): 1–9
YIN Xianggen, WANG Zhen, CHEN Yu, et al. Multi-object analysis and control of static synchronous compensators integrated with distribution transformer[J]. Power System Protection and Control, 2018, 46(9): 1–9
[9] 李兰芳, 曾志武, 王映品, 等. 基于时域的谐波和无功检测技术的对比研究[J]. 电工电能新技术, 2017, 36(11): 79–88
LI Lanfang, ZENG Zhiwu, WANG Yingpin, et al. Comparative study of harmonic and reactive power detections based on time domain[J]. Advanced Technology of Electrical Engineering and Energy, 2017, 36(11): 79–88
[10] 石祥建, 牟伟, 韩焦, 等. 大型同步调相机控制策略研究[J]. 中国电力, 2017, 50(12): 44–50
SHI Xiangjian, MU Wei, HAN Jiao, et al. Research on control strategy of large synchronous condensers[J]. Electric Power, 2017, 50(12): 44–50
[11] 唐海国, 冷华, 朱吉然, 等. 基于智能配变终端的变压器低压保护改进策略[J]. 中国电力, 2016, 49(增刊1): 11-15.
TANG Haiguo, LENG Hua, ZHU Jiran, et al. Operation analysis and improvement strategies of low voltage protection for transformer based on intelligent transformer terminal unit[J]. Electric Power, 2016, 49(S1): 11-15.
[12] 吴杰, 赵丽霞, 赵凡凡, 等. 一种改善三相不平衡下逆变器并网系统电能质量的新方法[J]. 电工电能新技术, 2016, 35(11): 8–13
WU Jie, ZHAO Lixia, ZHAO Fanfan, et al. A new method to improve power quality of inverter grid system under three-phase unbalance[J]. Advanced Technology of Electrical Engineering and Energy, 2016, 35(11): 8–13
[13] ENDRES B, THIELE G, BONFANTI I, et al. Design and operational testing on thyristor modules for the SVC Kemps Creek[J]. IEEE Transactions on Power Delivery, 1990, 5(3): 1321–1326.
[14] 陈杏灿, 程汉湘, 彭湃. 智能型TSC的晶闸管可靠触发的分析与研究[J]. 广东电力, 2016, 29(5): 82–85
CHEN Xingcan, CHENG Hanxiang, PENG Pai. Analysis and research on reliable trigger of intelligent TSC thyristor[J]. Guangdong Electric Power, 2016, 29(5): 82–85
[15] LI Yongxia, GONG Yulei. Design of three phase load unbalance automatic regulating system for low voltage power distribution grids[C]//MATEC Web of Conferences, EDP sciences, 2018: 1-5.
[16] 程浩忠, 艾芊, 张志刚. 电能质量[M]. 北京: 清华大学出版社, 2006.
[17] 陈晓静, 陈武, 肖先勇, 等. 电压敏感负荷电压凹陷敏感性估计[J]. 四川电力技术, 2008, 31(5): 17–19, 72
CHEN Xiaojing, CHEN Wu, XIAO Xianyong, et al. The sensitivity stochastic assessment of equipment due to voltage sag[J]. Sichuan Electric Power Technology, 2008, 31(5): 17–19, 72
[18] 李伟胜, 胥布工, 汤玉峰. 智能电网馈线终端一种高精度测频算法及应用[J]. 电力系统自动化, 2014, 38(11): 109–115
LI Weisheng, XU Bugong, TANG Yufeng. A high accurate frequency-measuring algorithm and its application in smart grid feeder terminal units[J]. Automation of Electric Power Systems, 2014, 38(11): 109–115
[19] 张成杰, 乔鸣忠, 朱鹏, 等. 滑窗迭代DFT检测谐波和无功电流的新算法[J]. 电力系统及其自动化学报, 2015, 27(12): 19–22
ZHANG Chengjie, QIAO Mingzhong, ZHU Peng, et al. New method of harmonic and reactive current detection based on sliding-window iteration DFT[J]. Proceedings of the CSU-EPSA, 2015, 27(12): 19–22
[20] 赵洪山, 高夺, 张健平. 风机齿轮箱振动信号的稀疏傅里叶变换分析[J]. 中国电力, 2016, 49(8): 69–73, 98
ZHAO Hongshan, GAO Duo, ZHANG Jianping. Analysis of sparse Fourier transform for vibration signal of wind turbine gearbox[J]. Electric Power, 2016, 49(8): 69–73, 98