Abstract
This paper proposes a new backup protection scheme, named coordinated backup protection (CBP) scheme, for distribution networks containing distributed generation. The proposed protection scheme takes into account the issues faced by traditional backup protection, such as difficulty in setting parameters and complex cooperation, and considers the features of distribution networks, such as changeable power flow because of high penetration of distributed generation sources and insufficient measuring quantities. The CBP scheme includes two aspects: coordinated substation protection and regional master substation protection, who also work as nearby backup protection and remote backup protection respectively. The two protections support each other by local information coordination and regional information sharing, in order to improve the reliability of fault identification. The configuration principles and performances of the proposed backup protection scheme are addressed in the paper. Different fault conditions in the IEEE 14-node system have been used to illustrate and verify the feasibility of the CBP scheme.
Highlights
Modern power systems are facing great challenges due to the deregulation of the electricity market, environmental concerns and energy policy change
It defines that voltage transformers (VT) is named by the node number, and current transformers (CT) is named by the two-terminal nodes and location terminal
U4 is the voltage of node 4, I471 is the current of line 4–7 at the node 4 terminal, and I472 is the current of line 4–7 at the node 7 terminal
Summary
Modern power systems are facing great challenges due to the deregulation of the electricity market, environmental concerns and energy policy change. The growth of renewables as energy source has promoted the development of distributed generation [1, 2]. Traditional electrical infrastructure cannot satisfy these development requirements, and a new grid infrastructure is urgently needed. To address the challenges facing the existing power grid, the new concept of smart grid has emerged [3, 4]. With the wide spread application of intelligent electronic devices (IEDs), information digitization and the IEC61850 protocol, the development of protection using comprehensive information is greatly impelled. Extensive studies have been carried out by researchers on how to improve the protection performance and functionalities by better utilization of digital and communication
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