Purpose Distribution network protection is a complicated problem and mal-operation of the protective relays due to false settings make the operation of the network unreliable. Besides, obtaining proper settings could ...
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Purpose Distribution network protection is a complicated problem and mal-operation of the protective relays due to false settings make the operation of the network unreliable. Besides, obtaining proper settings could be very complicated. This paper aims to discuss an innovative evolutionary lightning flash algorithm (LFA) which is developed for solving the relay coordination problems in distribution networks. The proposed method is inspired from the movements of cloud to ground lightning strikes in a thunderstorm phenomenon. LFA is applied on three case study systems including ring, interconnected and radial distribution networks. The power flow analysis is performed in Digsilent Power Factory software;then the collected data are sent to MATLAB software for optimization process. The proposed algorithm provides optimum time multiplier setting and plug setting of all digital overcurrent relays in each system. The results are compared with other methods such as particle swarm optimization and genetic algorithm. The result comparisons demonstrate that the proposed LFA can successfully obtain proper relay settings in distribution networks with faster speed of convergence and lower total operation time of relays. Also, it shows the superiority and effectiveness of this method against other algorithms. Design/methodology/approach A novel LFA is designed based on the movements of cloud to ground lightning strikes in a thunderstorm. This method is used to optimally adjust the time multiplier setting and plug setting of the relays in distribution system to provide a proper coordination scheme. Findings The proposed algorithm was tested on three case study systems, and the results were compared with other methods. The results confirmed that the proposed method could optimally adjust the relay settings in the electric distribution system to provide a proper protection scheme. Practical implications The practical implications can be conducted on distribution networks. The studie
Due to the complexity and importance of the electricity grid stability, sophisticated control systems and computational approaches are essentially required to solve dynamical system frequency problems in multi-area sy...
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Due to the complexity and importance of the electricity grid stability, sophisticated control systems and computational approaches are essentially required to solve dynamical system frequency problems in multi-area systems. Participation of wind turbines in power system frequency control in the form of stepwise inertial control in the presence of a proposed adequately tuned fuzzy-PID load-frequency control is investigated in this paper. A two-area power system is studied in which it is linked through tie-line and equipped with fuzzy-PID control systems. To increase the energy transition and flexibility of the entire system against frequency events and parameters uncertainties, the fuzzy-PID controllers are first tuned using lightning flash algorithm (LFA). The tuned controllers are then used in each area to optimally counterbalance the frequency deviations and the tie-line power of the interconnected areas against varying load disturbances, wind power fluctuations, and to keep the renewable integrated system in a stable state. The sensitivity analysis is also conducted with a wide range of system parameter variations, uncertainties, and disturbances. Furthermore, the LFA-tuned fuzzy-PID load-frequency control is also tested in a two-area isolated microgrid, comprising wind turbine, PV panels, fuel cells, micro-turbine, and diesel engine generator. The results obtained using the proposed approach are compared with other state-of-the-arts algorithms and control systems in the literature. The compared results show the efficiency and robustness of the proposed optimization-based controller for better frequency control in multi-area power systems and isolated microgrids. The results also demonstrate that a finely tuned automatic generation controller gives a significant boost to grid frequency control when wind turbines participate in the inertial control, suggesting migration from conventional PID-based automatic generation control to more adaptive control approaches.
A noteworthy phenomenon in nowadays distribution network is the increasing obvious trend that distributed generations (I)Gs) were integrated into the distribution network. The problems arising out of it, such as the v...
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ISBN:
(纸本)9781538694909
A noteworthy phenomenon in nowadays distribution network is the increasing obvious trend that distributed generations (I)Gs) were integrated into the distribution network. The problems arising out of it, such as the voltage limit violation of point of common coupling (PCC), low capacity of active power consumption of DGs and high network loss of distribution network, always happen. It is extremely urgent to regulate the bus voltage for distribution network with DGs. This paper analyzed the influence of DGs integrated into the distribution network, and designed the voltage control idea of DGs integrated into the distribution network. The voltage control model considered minimum voltage deviation of PCC, minimum network loss and maximum consumption of DGs. The lightning flash algorithm (LFA) was adopted to solve the multi-objective model. Finally, the results of case study on improved IEEE33 bus system demonstrate the rationality of the proposed mathematical model and the v alidity of its solution algorithm.
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