1. Wind Turbine Transformer Optimum Design Assuming a 3D Wound Core

Pedram Elhaminia; Ahmad Moradnouri; Mehdi Vakilian

Volume 03, Issue 03 , Summer 2014, Pages 125-132

  A wind turbine transformer (WTT) is designed using a 3D wound core while the transformer’s total owning cost (TOC) and its inrush current performance realized as the two objective functions in a multi-objective optimization process. Multi-objective genetic algorithm is utilized to derive Pareto ...  Read More

2. An Advanced Hysteresis Controller to Improve Voltage Profile of Power System with PV Units: A Smart Grid Power Exchange Framework

Armin Teymouri; S. Hamid Fathi; Faramarz Karbakhsh

Volume 03, Issue 03 , Summer 2014, Pages 133-140

  Unlike traditional power grids, smart grids have the advantage of bidirectional power flow and having distributed generations. Distributed generation systems are usually supplied by renewable sources which can cause unpredicted voltage fluctuations as a result of being intermittent. While traditional ...  Read More

3. Photovoltaic Microgrids Control by the Cooperative Control of Multi-Agent Systems

Heidar Ali Shayanfar; Sajad Malek

Volume 03, Issue 03 , Summer 2014, Pages 141-147

  This paper presents a cooperative control which is applied to the secondary control of a microgrid controlled via a multi-agent scheme. Balancing power that leads to voltage and frequency stability in a microgrid is essential. The voltage and frequency regulations are limiting within the specified limits ...  Read More

4. New Strategy of Grid Connected Photovoltaic System Using Module Integrated Converters with B4 Inverter to Overcome Partial Shading Effect

Reza Rezaii; Mohammad Amin Abolhasani; Ali Yazdian Varjani; Reza Beiranvand

Volume 03, Issue 03 , Summer 2014, Pages 149-155

  This paper proposes a new configuration for solar energy conversion systems. One challenging issue of the photovoltaic (PV) systems is partial shading, and in this paper Module Integrated Converters (MIC) are used to overcome this problem in PV arrays. A few boost converters are employed as MICs to mitigate ...  Read More

5. A Novel Market Optimization Model in order to Minimizing Environmental Cost Caused by Plants

Mehdi Nourinezhad; Soodabeh Soleymani; Hosein Mohammadnezhad Shourkaei

Volume 03, Issue 03 , Summer 2014, Pages 157-163

  Nowadays generation capacity in traditional grid depends on fossil fuels and contributes significantly to the increase of pollution emission. In deregulated grids in addition to using demand response programs (DRPs) to reducing the cost of electricity production, peak clipping and improve reliability ...  Read More

6. Smart Starting of Induction Motor by Changing Core Magnetic Flux Value

Ebrahim Kazemzadeh; Mojtaba Zare banadkooki

Volume 03, Issue 03 , Summer 2014, Pages 165-171

  Single-phase squirrel cage and three-phase induction electromotors are the most popular electromotors used in industry from long ago. When an induction motor starts with direct connection method, it takes a lot of current from the power supply (several times the nominal current); so, several methods ...  Read More

7. Enhancement of Power System Voltage Stability Using New Centralized Adaptive Load Shedding Method

Manijeh Alipour; Heresh Seyedi

Volume 03, Issue 03 , Summer 2014, Pages 173-178

  This paper presents a new centralized adaptive method under frequency load shedding. Sometimes, after initial frequency drop following severe disturbances, although the system frequency returns to its permissible value, however, the system might become unstable due to voltage problems. In this regard, ...  Read More

8. Stochastic Congestion Alleviation with a Trade-off between Demand Response Resources and Load Shedding

Abbas Tabandeh; Amir Abdollahi; Masoud Rashidinejad

Volume 03, Issue 03 , Summer 2014, Pages 179-178

  Under the smart grid environments, Demand Response Resources (DRRs) as power system resources can effectively participate in and improve performance of electric systems. Congestion management is one of the technical challenges in which DRRs can play a significant role. Previously, congestion management ...  Read More