适用于多机集群的外部集中扰动式阻抗测量孤岛检测法

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摘要现有逆变器并网类新能源电源孤岛检测多采用主动法,但由于多个机组并网时扰动信号相互影响,存在检测盲区,同时可能影响系统电能质量。基于此,提出了一种可同时适用于单机和多机集群的有源孤岛检测方法,采用外部集中扰动方式,避免了多机扰动信号相互干扰,且可普适于逆变器并网类电源、同步发电机等多种类型电源,同时提出了逆变器并网类电源在外来扰动下的测量阻抗模型。利用宽频脉冲注入及高频电抗计算放大了孤岛前后特征量差异,提高了检测灵敏度。另外,通过间歇性过零点短时注入控制,提高了阻抗测算准确度,并降低了主动法对系统的扰动,保证了良好的电能质量,同时降低了对注入装置直流电压等级的要求,保证了实用性和经济性。

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	贾科
	郇凯翔
	魏宏升
	毕天姝
	何国庆

关键词 ：孤岛检测, 主动注入法, 多机集群逆变器, 阻抗模型, 高频电抗计算

Abstract：Active detection methods are mostly employed in existing islanding detections for renewable power generations which are connected to the grid through inverters.But,due to the mutual interferences of their disturbance signals,there might be a non-detection zone when multiple generations or inverters are connected to the grid.And also,this would bring bad influences on the power quality of the system.In view of the issues above,an active islanding detection method suitable for both single distributed generator (DG)and multiple-DGs cluster is put forward in this paper,which can avoid the mutual interferences of multi-supply disturbance signals.In addition,it is universally applicable for different types of DGs,including the grid-connected inverter and the synchronous generator,etc.Meanwhile,the measured impedance model for the grid-connected inverter is proposed under circumstances of the external disturbance signals.The characteristic quantity distinction before and after islanding is amplified by using the wideband spike pulse injection and the high-frequency reactance calculation,which improves the detection sensitivity.Moreover,by means of the intermittent zero-crossing-point (ZCP)injection control proposed in the paper,the method improves the accuracy of the impedance estimation,reduces the disturbances to the power system caused by the active detection method,and ensures favorable power quality.Meanwhile,the control lowers the requirement for the DC voltage level of the injection device,which ensures the practicability and economy.

Key words： Islanding detection active injection method multi-DGs duster impedance model high-frequency reactance calculation

收稿日期: 2015-07-05 出版日期: 2016-07-15

PACS:

TM77

基金资助:国家重点基础研究发展(973)计划(2012CB215206)、国家自然科学基金(51407067)、中央高校基本科研业务专项资金(2014MS07,2016ZZDS01)和青海省光伏发电并网技术重点研究室(2014-Z-Y34A)资助项目。

作者简介: 贾科男,1986年生,博士,副教授,研究方向为电力系统保护与控制。E-mail:ke.jia@ncepu.edu.cn(通信作者);郇凯翔男,1991年生,硕士研究生,研究方向为电力系统保护与控制。E-mail:sdlwhkx@163.com

引用本文:

贾科,郇凯翔,魏宏升,毕天姝,何国庆. 适用于多机集群的外部集中扰动式阻抗测量孤岛检测法[J]. 电工技术学报, 2016, 31(13): 120-129. Jia Ke, Huan Kaixiang, Wei Hongsheng, Bi Tianshu, He Guoqing. An Islanding Detection Method Based on Impedance Estimation Using External Centralized Disturbances for Multi-Distributed Generation System. Transactions of China Electrotechnical Society, 2016, 31(13): 120-129.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I13/120

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