JZUS - Journal of Zhejiang University SCIENCE

Frontiers of Information Technology & Electronic Engineering 2015 Vol.16 No.5 P.418-427

A new technique for islanding operation of distribution network connected with mini hydro

Author(s): J. A. Laghari, H. Mokhlis, M. Karimi, A. H. A. Bakar, Hasmaini Mohamad
Affiliation(s): Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; more
Corresponding email(s): javedahmedleghari@gmail.com, hazli@um.edu.my
Key Words: Islanding operation, Mini hydro, Distributed generation (DG), Islanding detection, Load shedding

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Abstract: An islanding operation of a distribution network is a topic of interest due to the significant penetration of distributed generation (DG) in a power system network. However, controlling the frequency of an islanded distribution system remains an unresolved issue, especially when the load exceeds the generation. This paper presents a new technique for a successful islanding operation of a distribution network connected with multiple mini hydro based DGs. The proposed technique is based on three main parts. The first part uses an islanding detection technique to detect the islanding event correctly. The second part consists of a power imbalance estimation module (PIEM), which determines the power imbalance between the generation and load demand. The third part consists of a load shedding controller, which receives the power imbalance value and performs load shedding according to load priority. The proposed technique is validated on an 11 kV existing Malaysia distribution network. The simulation results show that the proposed technique is effective in performing a successful islanding operation by shedding a significant number of loads.

This paper presents a technique for islanding operation of distribution network with mini hydro based distributed generation. The proposed technique first detects the islanding event, then determines the power imbalance between the generation and load demand, and finally performs load shedding according to the load priority. The developed technique has been tested and validated on an 11 kV, Malaysia distribution network.

一种微型水电站分布式电网的新型孤岛操作技术

目的：分布式发电（distributed generation, DG）已显著渗透于电网系统，因而分布式电网的孤岛操作是一个研究热点。然而，控制孤岛式分布系统的频率，尤其是在负载需求高于电能产出的条件下，仍未解决。针对基于多个微型水电站的分布式发电网络，本文提出一种成功孤岛操作的新技术。
创新点：在孤岛探测基础上，设计基于频率、频率时间导数和负载优先级的自适应减载技术，将孤岛操作时的频率稳定于其标称值。
方法：所述方法由三部分组成（图1）：（1）利用孤岛探测技术正确探测孤岛现象；（2）利用功率不平衡模块确定生产与负载间的功率不匹配；（3）利用减载控制器，根据功率不匹配值和负载优先级进行减载操作。
结论：本文所述方法在现有的马来西亚11 kV分布式电网（图3）中得到了验证。仿真结果表明，通过减除显著数量的负载，本文方法可以有效进行孤岛操作。

关键词：孤岛操作；微型水电站；分布式发电；孤岛检测；减载

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