A new distribution power system planning approach for distributed generations with respect to reliability assessment

Abstract

Conventional methods for solving distribution systems planning (DSP) problem are related to the expansion of distribution systems such as substation reinforcement and feeder replacement. Nowadays, distributed generations (DGs) in various types are a new option for DSP. This paper presents a new approach to solve the DSP problem including DGs with respect to the reliability of the system. The impact of different types of DGs in order to improve the system reliability are modeled and studied by the adequacy transition rate using the Markov model. The objective functions of this optimization problem are power losses, DGs installation and operation cost, reliability indices such as energy not supplied, average interruption frequency, and average interruption duration. Since this optimization problem has a nonlinear complex nature, classical mathematical methods cannot guarantee to achieve the global optimum solution. To solve this problem, a fuzzy interactive multi-objective particle swarm optimization is developed based on Pareto solutions. The model resolves decision variables as follows: location, size, and type of the DG units. The results on IEEE 34-bus distribution system show the effectiveness of the proposed method rather than previous works for reliability assessment.

Power system security improvement using an OPA model and IPSO algorithm

“…GA is a well-known technique, 30,31 and a newer method, IPSO, has been used to solve optimization problems. In order to enhance the convergence speed of particle swarm optimization (PSO) 32 and to avoid losing important information in search space due to too much emphasis on the best personal position for each particle (Pbest) and the best global position for each particle (Gbest), the information of other individuals should be considered and be shared during the search process. This is the main idea of IPSO.…”

Spectral clustering for designing robust and reliable multi‐MG smart distribution systems

“…where CP sub is the price of electricity purchased from the main grid ($/MWh). iv Cost of VAR resources has two components and is formulated as follows [1]:…”

“…For safe operation of a distribution system, some constraints including the network power balance limitations, distribution feeders' thermal limitations, voltage limitation and maximum DG penetration must be satisfied and are explained in [1]. Other constraints for this problem are as follows:…”

“…RIR and the planning horizon are assumed to be 10% and 5 years. The load characteristic and IEAR are shown in Table 2 [1]. In this paper, it is assumed that the renewable DGs are operated at unity power factor and all loads have fixed power factor.…”

“…Owing to the environmental aspects, renewable DGs, as sustainable energy resources, attract more attention among other types of DGs. However, the intermittent nature and the uncertainties associated with these resources are challenging issues that must be carefully addressed during their integration in the PDSs [1,2]. Moreover, the reactive power resources (RPRs) placement in PDSs is also a challenging problem, which can be investigated together with DGs integration.…”