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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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

Received: 05 July 2015 Published: 15 July 2016

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TM77

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	Jia Ke
	Huan Kaixiang
	Wei Hongsheng
	Bi Tianshu
	He Guoqing

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Jia Ke,Huan Kaixiang,Wei Hongsheng等. An Islanding Detection Method Based on Impedance Estimation Using External Centralized Disturbances for Multi-Distributed Generation System[J]. Transactions of China Electrotechnical Society, 2016, 31(13): 120-129.

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

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