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For a number of years Power Management System (PMS) have been used to control islanded power systems. It can control system frequency and voltage as well as generated real and reactive power. The PMS would often have a load shedding facility to prevent the cascade failure of the generation system. The investigation is based on dynamics time domain simulations by DigSilent software and aims to define...
This paper presents a modified formulation for transmission network augmentation planning (TNAP) with regards to the role of corona power loss. The proposed approach applies Peek's law as a practical non-linear equation to calculate the impact of corona power loss. According to Peek's law, the corona power loss is sensitive to the geometric mean distance (GMD) and the geometric mean radius (GMR) of...
This paper presents a fuzzy multi-objective approach for clearing the reactive power market. The object functions that have been studied are the total payment function (TPF), voltage stability and the voltage deviation of the buses. All of the object functions are transformed to membership functions and then a pseudogoal function is derived to express a unique object function. The proposed reactive...
This paper presents a fuzzy multi-objective approach for clearing the reactive power market. The object functions that have been studied are the total payment function (TPF), voltage stability and the voltage deviation of the buses. All of the object functions are transformed to membership functions and then a pseudogoal function is derived to express a unique object function. The proposed reactive...
This paper presents an improved harmony search algorithm for the optimal reactive/voltage control problem. Optimal reactive/voltage control is a mixed integer, nonlinear optimization problem which includes both continuous and discrete control variables. The proposed algorithm is used to find the settings of control variables such as generator voltages, tap positions of tap changing transformers and...
Presence of the distributed generation (DG) in electric systems can represent a significant impact on the operational characteristics of distribution networks. The optimal placement and sizing of generation units on the distribution network has been continuously studied in order to achieve different aims. In this paper our aim would be optimal distributed generation allocation for voltage profile...
Loss minimization in distribution networks has considered as great significance recently since the trend to the distribution generation will require the most efficient operating scenario for economic viability variations. Furthermore, voltage instability phenomena can occur in distribution systems and caused a major blackout in the network. The decline of voltage stability level will restrict the...
According to reports that had been published in many papers, switching operation in gas insulated substation (GIS) lead to malfunction in the substation equipments. These improper functioning contain of malfunction electronic equipments and deformation of transformer winding and bushing failures. The reason of malfunction of electronic equipments is due to coupling voltages on data and control cables...
The security of a power system can be defined as its ability to withstand a set of severe disturbances, and to survive transition to an acceptable new steady state condition. In this paper harmony search algorithm has applied to determine optimal location of FACTS devices in a power system to improve power system security. Three types of FACTS devices have been introduced. Line overload and bus under...
In a competitive power market, it is important to expand or strengthen transmission system in order to provide a fair environment to all market participants. In the present paper, a new method to determine an optimal transmission expansion plan in the deregulated power system has been proposed. In the proposed scheme, uncertainties, security index and transmission costs in calculation of LMPs for...
Over the years, as our knowledge of the interrupting process progressed, many techniques have been developed to test the circuit breakers and simulated arc models. To develop a realistic arc model, it is necessary to adopt the micro modeling approach, where a model is based on the physical processes constituting the phenomena. The model should consist of mathematical equations formulated from considerations...
Voltage collapse is instability of heavily loaded electric power systems that cause to declining voltages and blackout. Power systems are predicated to become more heavily loaded in the future decade as the demand for electric power rises while economic and environmental concerns limit the construction of new transmission and generation capacity. Heavily loaded power systems are closer to their stability...
In this paper enhancement of power system stability using coordination between power system stabilizer (PSS) and static VAR compensator (SVC) as stabilizers of system and generator is studied. Genetic algorithm is used for optimization and finding optimal control parameters. To indicate capability of controllers, three scenarios have been chosen. In the first scenario only SVC has been implemented...
The utilization of renewable energy sources in electric power systems is increasing quickly because of public apprehensions for unpleasant environmental impacts and increase in the energy costs involved with the use of conventional energy sources. Despite the application of these energy sources can considerably diminish the system fuel costs, they can also have significant influence on the system...
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