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To evaluate the effect of distribution automation, and to support distribution automation planning, a benefit evaluation method of distribution automation is proposed. The method makes clear the aim of evaluation and boundary conditions, applies failure mode and effect analysis and enumeration to calculate the automation effect. The method applies differential evolution algorithm to improve the applicability...
Reliability Analysis System for Protection Relays (RASPR) is developed by CRIEPI, has been introduced into all of 11 Japanese electric power utilities. RASPR is a powerful tool to study the improvement of maintenance procedure and to investigate the replacement of aged relays based upon the accumulated data. RASPR is mainly composed of the database and the analysis system; in the former part, the...
An increasing number of utilities are using System Integrity Protection Schemes (SIPS) to minimize the probability of large disturbances and to enhance power system reliability. This trend leads to the use of an increased number of SIPS resulting in additional risks to system security. This paper proposes a procedure based on Markov Modeling for assessing the risk of a SIPS failure or misoperation...
The future development trend of electric power grid is smart grid, which include such features as flexible, clean, secure, economic, and friendly and so on. Smart grid involves power generation, transmission, transformation, distribution, consumption and dispatching. Distribution network locates at the end of power system, and due to its direct connection with consumers, the quality and ability of...
As the development requirements of China's low-carbon economy and Strong & Smart Grid, energy storage systems are increasingly being wide used. Together with installation of energy storage device, configuration principle and functional specifications of energy storage monitoring system should also be defined. Especially, since energy storage systems are commonly used in the distribution network,...
In order to make more rational and effective use of distributed generation (DG), microgrid has been put forward. However, the connection of microgrid has a fundamental impact on the protection of distribution network. A brief introduction of the structure of microgrid was given, and the potential impact of DG on the protection and autoreclosing was analyzed. Some protection methods were summarized,...
The distribution network will be changed from the single power to the multi-power supplied when DG combined into it. Three-section current protections will no longer be applicable. Therefore, a new protection scheme which is suitable for the distribution network contained DG be proposed, which is that the protections lying on the downstream lines of DG need to have new setting value, and the protections...
The microgrid is a miniature power supply load and an independent control system to provide local power and heat. This concept provides a new model to describe the microgrid operation; microgrid can be seen in the power unit in a controlled, it can respond in seconds to meet the needs of the external transmission and distribution networks; on the user, the microgrid to meet their specific needs: increase...
Protection device is repairable system, and its routine maintenance is Minimum Maintenance. With the number of maintenance increasing, both the reliability of relay and the economy of maintenance are decreasing. Therefore, it should be replaced at a proper time. The optimal replacement strategy was studied based on relay reliability and maintenance economy according to field data. It first constructed...
This paper presents the analysis of relay system to identify the effects of misoperations on system reliability in the Thrace part of Turkish National Power Transmission System comprising 154 kV and 380 kV sub-systems. Since one of the main reasons of the cascading failures is the misoperation of the protection system, this study is concentrated on the analysis of relay system to minimize the risk...
Fuzzy fault tree analysis is a combination of fault tree analysis and fuzzy set theory. In accordance with fuzzy theory, if the failure probabilities of the components or equipment are not exact values, the failure probabilities are regarded as fuzzy numbers. The fuzzy failure rate of the system is estimated by using fuzzy rules. In this paper, a one-channel excitations equipment is analyzed, and...
With the development of digital technology, the temporary interruption problem in some economy developed areas has been pay great attention. The normally closed loop operation mode of distribution network with seamless fault self healing technology, is an effective solution to avoid the temporary interruption and improve the power supply reliability. This paper analyzes the normally closed-loop operation...
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