International Journal of Smart Electrical Engineering
Volume:9 Issue: 1, Winter 2020

Seas and oceans are the most important sources of renewable energy in the world. The main purpose of this paper is to use an appropriate control strategy to improve the performance of point absorbers. In this scheme, considering the high uncertainty in the parameters of the power take-off system in different atmospheric conditions, a new improved black hole algorithm is introduced to tune fuzzy controller parameters for controlling and tracking the power. In order to demonstrate validity and performance of the proposed algorithm, simulations are performed for some benchmark functions. The proposed method is then implemented for tuning the fuzzy controller parameters in order to obtain the maximum power capture of wave energy converters. Compared to particle swarm optimization and conventional black hole algorithm, the results of the proposed method indicate enhancements in reference speed tracking and absorbed power. Key words: wave energy converter, fuzzy control, improved black hole algorithm, uncertainty

In power grids, there must always be a balance between energy production and consumption. Due to the variable nature of consumers, energy production should also be subject to these changes. Electricity storage is one of the most important issues in the electricity industry, which can generate many ancillary services such as load curve leveling, peak shaving, integration with renewable units, rotating reservations, etc. This paper presents a new and practical method for locating, sizing, and optimally planning vanadium current storage batteries in the above distribution substations. In this innovative method, using load forecasting, the amount of peak consumption per day is calculated, and based on it, several indicators are defined to prioritize the storage installation location. Then, according to the power consumption information in the selected substation, the optimal storage capacity for leveling the load curve is determined, and finally, optimal planning for charging and discharging the storage is presented. In this paper, for simulation of real consumption data of the above distribution network of Semnan city has been used.

The growth and expansion of economic concepts in the power system is increasing in last years. Energy economists have considered the optimal decision-making of electricity market retailers in recent years. In this paper, a demand response program based model is pro-posed in order to make the optimal decision of the retailer in the electricity market, taking into account the different conditions that the retailer may face. The optimal model presented by mod-eling the behavior of retailers and consumers, while maximizing the profit of retailers, also leads to the optimal purchase of retailers from conventional contracts in the electricity market. The formulation of the proposed model is based on the presence of the retailer in the bilateral con-tracts as well as the pool market contracts in such a way that the optimization problem is solved in the form of nonlinear programming with SNOPT solver in GAMS software. The results indicate the effectiveness of the proposed model based on the fact that while increasing the retailer profit, the retailer purchase is also managed in the bilateral contract and the pool market.

Today, the use of CMOS technology for the manufacture of electronic ICs has faced many limitations. Many alternatives to CMOS technology are offered and made every day. Quantum-dot cellular automata (QCA) is one of the most widely used. QCA gates and circuits have many advantages including small size, low power consumption and high speed. On the other hand, using special digital gates called reversible gates, a series of reversible circuits can be built that have their own advantages and applications in digital design. Reversible circuits can be implemented by QCA gates. One of the most important reversible gates implemented by QCA gates is QCA1 gate. In this paper we proposed a reversible full adder using QCA1 gates. Then, proposed reversible full adder is improved to the fault-tolerant structure. This structure has better indexes such as area and latency than similar ones. Reversible circuits are a kind of intelligent systems; because the possible system error can be distinguished by the output values.

Optimal placement of scattered generator sources in the main and secondary feeders of radial grid reduces energy losses, releases the capacity of existing feeders and improves the existing voltage profile. In this project determine the location and suitable for the production of production resources S cattered in radial feeders of unbalanced distribution networks, a new formulation solution is proposed. The application of scattering generation sources proposed in this project is independent of the voltage level of the system under study and its limitation is radial and unbalanced distribution system under study.

The increasing development of the use of new energies has led to the widespread use of power electronics, so that electronic power converters play an important role in extracting power from renewable sources. Power electronics can convert raw energy produced from new energy into the desired power with controlled current, voltage and frequency to be used in the power grid. Restructuring of power systems has led to an increasing number of scattered products in these systems. Distributed generation units, depending on the specifications, operating conditions and installation location, can be the source of positive effects such as improving the reliability of distribution networks. In this paper, the effect of distributed generation on reliability in wind systems is modeled. With the presence of DG, the distances of power infrastructure equipment are reduced, and as a result, system losses are reduced and ultimately network safety is improved. Proper design of these systems from the point of view of proper selection of active and inactive elements and proper design of ventilation system will have a direct impact on the reliability of these systems. It is also important to study the methods that do not lose the total output power of the converter after an error occurs in electronic converters.