مجله کیفیت و بهره وری صنعت برق ایران
سال ششم شماره 2 (پیاپی 12، پاییز و زمستان 1396)

Sometimes, high-voltage transmission lines passes from an area that there is impossible to build a distribution network, or building a substation is not cost-effective in that location. In this paper, a novel system is proposed that can be delivered the power via the overhead guard wire. The case study is a 400kV high-voltage transmission line with a Telecommunication site with low power consumption. In this proposed system, the electromagnetic induction of voltage of phase conductors on overhead guard wires is used to generate the power. In this case, one of the guard wires can be detached from the ground to use this induced voltage as a voltage source for feeding the loads. Since load voltage should remain relatively stable, an Inductance Variable Auto-Controle´e a` Entrefers (IVACE) regulator is used for this purpose. Different contingency conditions such as switching and short circuit are applied to evaluate the performance of the IVACE regulator. Simulations are carried out using Electromagnetic Transients Program (EMTP) software. Also, the impacts of the length of the detached overhead guard wires from the ground are investigated on the induced voltage. Moreover, the effect of the switching and short circuit on the output voltage is tested in the absence and presence of the regulator. The robustness and effectiveness of the proposed approach is verified through simulation study.

In this paper, a hybrid algorithm has been presented for energy management in multi-microgrid systems considering security constraints. The energy management system is responsible for accurately dispatching the amount of required energy among multiple microgrids and units in a muti-microgerid system. The energy management procedure is done hierarchically, in a way that each microgrid performs a local energy management, which determines surplus and shortage amounts of energy at each time interval. Accordingly, Independent System Operator (ISO), schedules the units. Each microgrid, contains a wind turbine (WT) and Photovoltaic (PV) panels as renewable and nondispatchable resources and a diesel generator as a dispatchable energy resource. Also an energy storage system (ESS) is responsible for balancing the produced and consumed energy. A demand response program (DRP) is performed through energy management system for the objective of MG load management and flattening the load curve and reducing the operation cost. Finally, the proposed approach is tested on IEEE 33-bus distribution test system, in presence of microgrids, using GAMS and MATLAB softwares. The simulation results would be presented in the final section to show the effectiveness of the proposed algorithm.