چكيده به لاتين
Distribution networks have become increasingly variable with the increasing of distributed generation (DG) and renewable energy, and power generation in these networks has been significantly decentralized. In recent decades, the notion of smart grid has been more and more considered by researchers. A smart grid is a network that increases the efficiency of the power system and encourages the use of renewable resources. In new power networks, the presence of distributed generation sources and other factors have caused network voltage to tend to deviate from voltage standards. Considering the need for a high-quality network, smart grid management strategies need to be provided to achieve standards, without increasing investment costs and network maintenance. The relationship between voltage and network power is nonlinear, complex and dependent; therefore, the modeling, decision-making and implementation of control objectives are a bit complicated. In the meantime, many studies have been conducted on voltage management in distribution networks in the presence of distributed generation sources in the researches.
In this research, a brief introduction of modern power systems, Distributed generation, voltage control systems and their comparison in distribution networks has been discussed. In detail, it proposes a new technique called Optimal Coordinated Voltage Control (OCVC) to solve a Multi-Objective (MO) optimization problem with the objective to minimize the voltage error at pilot buses, the reactive power deviation and the voltage error at the generators which is a completely new and efficient way to control the voltage of distribution networks. OCVC uses Pareto optimization to find the optimal values of voltage of the generators and On-Load Tap Changer (OLTC). In fact, this method solves all voltage problem, including the DG’s over-voltages, and could be an interesting way to reduce or eliminate future investments in classical voltage and reactive power regulation. Finally, the OCVC is compared with the classical method of Coordinated Voltage Control (CVC) and is tested on the IEEE 13 Node test feeder with unbalanced load. Some disturbances are investigated and the results show the effectiveness of the proposed technique.
Keywords: Smart Distribution Grid, Voltage Control, Distributed Generation, Multi-Objective Optimization, Power Loss, On-Load Tap Changer (OLTC).