Wind energy is one of the extra ordinary sources of renewable energy due to its clean character and free availability. We used a static synchronous compensator (STATCOM) to supply the reactive power and voltage support to a wind farm equipped with Induction Generators(IGs) and power system during grid faults. Also, the STATCOM is used in steady state to supply reactive power in power system. Simulation results show that the wind turbine bus voltage is quickly reestablished shortly after the fault has been cleared, and therefore, the wind turbine remains in service during the presence of STATCOM. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability. The choice of this study is justified by simulation in MATLAB. Manuscript profile

Nowadays, the presence of distributed generation (DG) units in the distribution network is increasing due to their advantages. Due to the increasing need for electricity, the use of distributed generation sources in the power system is expanding rapidly. On the other hand, in order to respond to the growth of load demand, the network becomes wider and more interconnected. These factors increase the level of fault current in the power system. Sometimes this increase causes the fault current level to exceed the ability to disconnect the protective devices, which can cause serious damage to the equipment in the power system. Using fault current limiters (FCLs) in power system is very promising solution in suppressing short circuit current and leads use of protective equipment with low capacities in the network. In this paper, in order to solve the problem of increasing the fault current, first using sensitivity analysis, network candidate lines are selected to install the fault current limiter, which helps to reduce the time and search space to solve the problem. Simultaneously finding the optimal number, location and amount of impedance for the installation of a resistive superconductor limiter is solved using the multi-objective Non-dominated genetic algorithm with non-dominated sorting (NSGA-II). The method presented in a 20 kV ring sample network, simulated in PSCAD software, is evaluated in the presence of distributed generation sources and its efficiency is shown. Manuscript profile

This paper explores the inherent characteristics of multigrounded three-phase four-wire distribution systems under unbalanced situations. As a result, the mechanism of profile voltage in MGN feeders becomes difficult to understand. The simulation tool that been used for this paper is Matlab under Windows platform. In this paper the equivalent model of a full-scale multi-grounded distribution system implemented by Matlab is introduced. The results are expected to help utility engineers to understand the impact of MGN on distribution system operations.This paper explores the inherent characteristics of multigrounded three-phase four-wire distribution systems under unbalanced situations. As a result, the mechanism of profile voltage in MGN feeders becomes difficult to understand. The simulation tool that been used for this paper is Matlab under Windows platform. In this paper the equivalent model of a full-scale multi-grounded distribution system implemented by Matlab is introduced. The results are expected to help utility engineers to understand the impact of MGN on distribution system operations. Manuscript profile