Reliability assessment of power distribution systems using disjoint path-set algorithm

Abstract

Finding the reliability expression of different substation configurations can help design a distribution system with the best overall reliability. This paper presents a computerized and implemented algorithm, based on Disjoint Sum of Product (DSOP) algorithm. The algorithm was synthesized and applied for the first time to the determination of reliability expression of a substation to determine reliability indices and costs of different substation arrangements. It deals with the implementation and synthesis of a new designed algorithm for DSOP implemented using C/C??, incorporating parallel problem solving capability and overcoming the disadvantage of Monte Carlo simulation which is the lengthy computational time to achieve satisfactory statistical convergence of reliability index values. The major highlight of this research being that the time consuming procedures of the DSOP solution generated for different substation arrangements using the proposed method is found to be significantly lower in comparison with the time consuming procedures of Monte Carlo-simulation solution or any other method used for the reliability evaluation of substations in the existing literature such as meta-heuristic and soft computing algorithms. This implementation gives the possibility of RBD simulation for different substation configurations in C/C?? using their path-set Boolean expressions mapped to probabilistic domain and result in simplest Sum of Disjoint Product which is on a one-to-one correspondence with reliability expression. This software tool is capable of handling and modeling a large, repairable system. Additionally, through its intuitive interface it can be easily used for industrial and commercial power systems. With simple Boolean expression for a configuration's RBD inputted, users can define a power system utilizing a RBD and, through a fast and efficient built-in simulation engine, the required reliability expressions and indices can be obtained. Two case studies will be analyzed in this paper. The effects of different substation configurations on the reliability are analyzed and compared. Then, the reliability of a radial distribution system will be evaluated using DSOP solution. The failure results will be combined with a load flow scenario, and indices such as SAIDI, SAIFI will be determined.

Impact Assessment of Microgrid in Smart Cities: Indian Perspective

“…Reliability assessment of a power distribution network is a measure of the adequacy of electricity supply available to the customers of different load points. The commonly used load point indices are average failure rate (λ i ), average duration of outage (r i ) and average annual outage time (U i ) [25,26]. Since, reliable supply is one of the important requirements of a smart city, therefore these indices are evaluated for various load points of Rampur city which helps in assessing its distribution network performance.…”

“…It is observed that with the deployment of microgrid, the average failure rate and average outage duration to the load points of feeders F2, F3 and F4 are decreased and consequently a significant decrease in annual average outage duration is achieved, thereby enhancing the distribution network reliability. The reliability assessment of the distribution network is also done on the basis of evaluation of several system reliability indices such as system average interruption failure index (SAIFI), system average interruption duration index (SAIDI), customer average interruption duration index (CAIDI), energy not supplied (ENS) and average energy not supplied (AENS) [25,26]. These indices are most common and are widely used to assess the distribution network performance.…”

On computing the reliability of opportunistic multihop networks with Mobile relays

“…Among these, we can extract possibilities based on some criterion (delay, throughput, flow requirements etc) to find a deterministic or probabilistic network performance measures. Other than the method of network decomposition, the minimal path set and/or minimal cut set concepts have extensively been used to evaluate the reliability of many systems such as communication networks, power systems network, multiphase systems, multistate systems, and flow networks etc. If we do not set any performance constraint such as delay requirement or flow requirement, then the minimal path sets can be used to determine the probabilistic connectivity of the network.…”

Reliability optimization problems with multiple constraints under fuzziness

“…Today reliability is considered in almost all engineering system designs. Problem of the reliability in various designs of system have been explored by Tillman et al (1980), Misra (1986), Kuo et al (2001), Taghizadeh and Hafezi (2012), Yusuf (2014), Rao and Naikan (2014), Bourezg and Meglouli (2015), and many more.…”

“…A case study of the investigation of supply chain's reliability measure has been done by Taghizadeh and Hafezi (2012). Bourezg and Meglouli (2015) has done a reliability assessment of power distribution systems.…”