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Abstract
Traditional electric distribution systems are radial in nature. These networks are protected by very simple protection devices such as over-current relays, fuses, and reclosers. Recent trends in distributed generation (DG) and its useful advantages perfectly can be achieved while the relevant concerns are deliberately taken into account. For example, penetration of DG disturbs the radial nature of conventional distribution networks. Therefore, protection coordination will be changed in some cases, and in some other cases it will be lost. In this paper, a new approach is presented for determining the maximum capacity of DG for maintaining the coordination of distribution system's protection devices. In the suggested approach, the contribution of DGs in fault current is limited through considering mathematical equations of characteristics of protection devices. All steps from the beginning to the end were implemented on a simple distribution network using MATLAB and DIgSILENT Power Factory and finally the numerical results are presented in order to confirm the authenticity of suggested approach.
Highlights
Upgrading the protection system of distributionDistributed Generation (DG) is defined as energy networks in order to have perfect operation in presence of sources connected to distribution systems
Protective devices may need to be changed or have of power quality and network’s reliability, as well as new settings but requires large investment, and cannot be environment considerations, etc., Micro turbines, small established in a short period
A voltaic arrays are the main types of distributed generation new approach is presented for determining the maximum
Summary
Distributed Generation (DG) is defined as energy networks in order to have perfect operation in presence of sources connected to distribution systems. Fig.[4] shows the main effect of DGs, which is contributing in fault currents Presence of these kinds of energy resources will change the protection coordination range in some cases, and in some other cases it will result in losing it. It is possible that this temporary fault will be cleared by the lateral fuse, and be changed to a permanent fault These undesirable operations of protective devices called "Fuse Blowing" (Fig.4) and certainly decrease the system reliability. In compliance the coordination philosophy, described, considering recloser and fuse operation at the same time, Ifuse,margin can be achieved by vector summation of DG and distribution substation currents. This value must not be more than the mentioned criteria. This feeder supplies 34 distribution substations, including 3 ground and 31 aerial ones
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