Power Quality Detection and Compensation Method of AC/DC Hybrid Distribution Network

doi:10.11985/2018.09.007

Abstract

Abstract:

With the increasing number of distributed generation connecting to the distribution network, the network structure is becoming more and more complex. the network also becomes more flexible to operation, power quality problems in distribution network is becoming more and more complicated situation, voltage and current distortion is serious. In this paper an improved detection algorithm based on instantaneous reactive power theory is presented, this algorithm which is based on i_p-i_q method can detect the reactive power and negative sequence compensation of random harmonic current respectively in real time. The series structure of PI controller and repetitive controller is used to control the harmonics to produce an current injection line that is equal in magnitude and opposite in direction, so that the current in the line tends to be sinusoidal to cancel the harmonic and reactive influences. The effectiveness of the proposed method is verified by the prototype experiment.

Key words: Distributed generation, power quality, i_p-i_q, PI controller and repetitive controller, compensation detection, compensation control

CLC Number:

TM76

Zhang Jingan,Wang Leitao,Wang Peng. Power Quality Detection and Compensation Method of AC/DC Hybrid Distribution Network[J]. Journal of Electrical Engineering, 2018, 13(9): 38-43.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

References 11

[1]	韩民晓, 代双寅 . 分布式电源并网中电能质量及相关标准探讨[J]. 中国标准化, 2010(12):28-32.
	Han Minxiao, Dai Shuangyin . Power quality in power grid and related standards in distributed resource[J]. China Standardization, 2010(12):28-32.
[2]	董森森, 武振宇, 高自力 , 等. 10kV高压电能质量在线监测装置的研究现状及发展方向[J]. 电气技术, 2016,17(9):1.
	Dong Sensen, Wu Zhenyu, Gao Zili , et al. Research status and development trend of 10kV high voltage power quality on-line monitoring device[J]. Electrical Engineering, 2016,17(9):1.
[3]	许林, 曾意, 郭珂 , 等. 具有电能质量调节功能的光伏并网系统研究进展[J]. 电力系统保护与控制, 2012,40(9):137-145. doi: 10.7667/j.issn.1674-3415.2012.09.025
	Xu Lin, Zeng Yi, Guo Ke , et al. Development of photovoltaic grid-connected system with power quality regulatory function[J]. Power System Protection and Control, 2012,40(9):137-145. doi: 10.7667/j.issn.1674-3415.2012.09.025
[4]	汪宝, 匡洪海, 郑丽平 , 等. 分布式发电与配电网的协调发展与技术展望[J]. 电气技术, 2017,18(3):5-9.
	Wang Bao, Kuang Honghai, Zheng Liping , et al. Prospect over the techniques and coordinated development of distributed generation and distribution network[J]. Electrical Engineering, 2017,18(3):5-9.
[5]	何英杰, 刘进军, 王兆安 , 等. 一种基于瞬时无功功率理论的数字谐波检测[J]. 电工技术学报, 2010,25(8):185-192.
	He Yingjie, Liu Jinjun, Wang Zhaoan , et al. A digital method for detecting harmonic currents based on instantaneous reactive power theory[J]. Transactions of China Electrotechnical Society, 2010,25(8):185-192.
[6]	梅红明, 王一, 刘建政 . 采用网侧电流闭环控制的电能质量综合补偿方法[J]. 电网技术, 2013,37(8):2368-2375.
	Mei Hongming, Wang Yi, Liu Jianzheng . A comprehensive power quality compensation method based on feedback control of grid-side current[J]. Power System Technology, 2013,37(8):2368-2375.
[7]	朱晓娟, 胡海涛, 陶海东 , 等. 光伏并网系统的谐波不稳定产生机理及影响规律[J]. 电工技术学报, 2017,32(10):33-41.
	Zhu Xiaojuan, Hu Haitao, Tao Haidong , et al. The mechanism and influence of harmonic instability for photovoltaic grid-connected system[J]. Transactions of China Electrotechnical Society, 2017,32(10):33-41.
[8]	孙孝峰, 曾健, 李宁宁 , 等. 并联有源滤波器网侧谐波电流反馈控制[J]. 电工技术学报, 2012,27(10):150-154.
	Sun Xiaofeng, Zeng Jian, Li Ningning , et al. Improvement for the closed-loop control of shunt active power filter based on Feedback of supply-side current[J]. Transactions of China Electrotechnical Society, 2012,27(10):150-154.
[9]	崔浩, 舒朝君, 陈言 . 基于瞬时无功功率理论的谐波检测和抑制的模型参考自适应控制系统[J]. 电测与仪表, 2017,54(4):6-10. doi: 10.1021/acs.inorgchem.9b02917 pmid: 31774662
	Cui Hao, Shu Chaojun, Chen Yan . Model reference seif-adaptive control system of harmonic detection and suppression based on instantaneous reactive power theory[J]. Electrical Measurement & Instrumentation, 2017,54(4):6-10. doi: 10.1021/acs.inorgchem.9b02917 pmid: 31774662
[10]	Saikia L C, Borah S M, Pait S. Detection and classification of power quality disturbances using wavelet transform and neural network[C]. IEEE Annual India Conference, 2010.
[11]	Chen D, Zhang J, Qian Z . An improved repetitive control scheme for grid-connected inverter with frequency-adaptive capability[J]. IEEE Transactions of Industrial Electrononics, 2013,60(2):814-823.

谐波次数	1	2	3	4	5	6	7
治理前	22.900 1	0.003 9	0.029 0	0.000 4	2.851 7	0.003 8	1.940 1
治理后	23.102 0	0	0	0	0.326 0	0	0.210 1
谐波次数	8	9	10	11	12	13	14
治理前	0.003 9	0.032 8	0.003 9	1.482 0	0.000 4	0.820 0	0.000 3
治理后	0	0	0	0.190 2	0	0.210 3	0
谐波次数	15	16	17	18	19	20	21
治理前	0.045 0	0.002 9	0.498 0	0.000 3	0.395 0	0.000 2	0.063 2
治理后	0	0	0.089 0	0	0.090 0	0	0