Maryam Sadeghi ¹, Majid Gholami ¹

Affiliations
1 Department of Electrical Engineering, Islamic Azad University Islamshahr branch, Islamshahr, IR

Abstract

This paper intends to optimize the control fashion of PWM inverters of Intelligent Universal Transformer (IUT) using Genetic Algorithm (GA). IUT is the state of art proposed as an electrical key point of Advanced Distribution Automation (ADA) technology. It comprises the power electronic construction and high frequency transformer. ADA will be raised for tomorrow's distribution system to perform the exchanging platform for both data and information which will be fully monitored and automatically controlled. IUT is introduced as intelligent electronic devices in lieu of traditional transformer with the controllable architecture that enhances the reliability and system performances and leading to the various services and user benefits like desirable output voltage, level and frequency, DC voltage options and sag correction. In case of oil elimination benefit it also yield to size and weight reduction. In this approach current and voltage source controllers based on GA optimization are developed for controlling the firing angle of switching pattern of PWM inverters which are recommended for voltage level and frequency control of IUT. The GA smart optimization fashion with the proposed three levels IUT topology emphasizes on the very smooth control and voltage regulation in both input and output inverters of IUT. GA improves the system characteristics under load and input disturbances with regulating the voltage and harmonic elimination.

Keywords

ADA, DA, IUT, IED, Power Electronic, GA, THD

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Maryam Sadeghi ¹, Majid Gholami ¹

Affiliations
1 Department of Electrical Engineering, Islamic Azad University Islamshahr branch, Islamshahr, IR

Abstract

Due to restrictions on the use of fossil fuels and the need of using the renewable energy resources, and increasing energy demand, it is necessary to use the Distributed Energy Resources (DER) working in a microgrid to end the environmental developing concerns of high investment required for expanding the old current distribution and transition system. In this regard, the moderated fuzzy logic approach is presented for controlling the interactive inverters to integrate the wind turbine to grid using the Permanent Magnet Synchronous Generators (PMSG) to adjust the frequency of wind turbine generator to grid. The proposed interactive solutions is to parallel the electric utility and wind turbine with load and in case of excess of energy generated by wind, it could be exported to grid through the interactive inverter controlled by fuzzy logic controller scheme. Simulation result reveals that the grid current doesn't varied if the wind turbine connect to the grid and it is also in phase with the grid voltage so the unity power factor is expected and the maximum power transferred to load with the minimum total grid current harmonic distortion of 0.02% that is negligible.

Keywords

DER, FLC, Microgrid, PMSG, Renewable Energy Resource, THD

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Maryam Sadeghi ¹, Majid Gholami ¹

Affiliations
1 Department of Electrical Engineering, Islamic Azad University, Islamshahr Branch, Islamshahr, IR

Abstract

Intelligent Universal Transformer (IUT) is a smart multi functional power electronic device will comprise Advanced Distribution Automation (ADA) with new approach in distribution system in future. In contrast to traditional transformers, IUT comes with full monitoring and control functionalities and is controlled by the optimized Genetic Algorithm (GA) for tuning the Membership Functions (MFs) of Fuzzy Logic Controller (FLC). Normally it is the designer concerns to choose the best MFs and expert knowledge is emerged in MFs with no optimization procedure. FLC is non analytic alternative solution for controlling complex applications based on linguistically rules. GA is inspired by natural selection results in survival of strongest individuals in a competitive environment. It employs analogy of natural evolution to find the optimization solutions in highly complex topics. In each replication GA proposes the population of solution so that the value of next population is enhanced due to the last population. This procedure continues till the global optimal solution is occurred. In this approach the IUT application in microgrid for integrating the distributed new resources of energy to power utility is discussed and an optimized FLC fashion is presented for generating the switching pattern for the high frequency inverters of IUT in both Input-Output stages. The proposed optimized FLC together with the IUT topology yields to the smooth control scheme for integrating the microgrid to main grid which will improve the system reliability and performance.

Keywords

ADA, DER, IUT, FLC , Microgrid, Renewable Energy Resource

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