Realization and Design of Laboratory prototype system for direct current power transmission

High Voltage Direct Current systems have been used for transporting electrical energy for very long distances, at high voltages (100- 1000 kv). On utilize thyristorized or transistorized power converters, one converter is working as rectifier at sending side, and the other is working as inverter at receiving side. Back to Back Converters are used also where the rectifier and inverter are at the same station, transmission line has hundreds of meters as long. In our model we used non controlled three phase rectifier as sending station and controlled three phase bridge as receiving station (Graitze).

Enhancement of voltage Stability in power transmission networks using Static Compensator (STATCOM( based on Fuzzy logic

The fluctuation of voltage cannot be tolerant for equipment in modern industrial plants such as lighting loads, PLC, robots, and another equipment, which exist in transmission and distribution systems, so we should use proper aids to regulate voltage and control it. In this study a (± 25Mvar) Static Synchronous Compensator (STATCOM) is used to enhance voltage stability in a (66 kv, 1500MV.A) power transmission network. The STATCOM in this study regulates the voltage of the transmission network for changing in voltage (± 7%) from the nominal value. A model of the power transmission system and another model of the STATCOM device, which will enhance the stability of voltage are designed in MATLAB/Simulink. And the control of (STATCOM) is achieved by using a Proportional Integrative (PI) controller with Fuzzy Logic Supervisor to adjust the parameters in PI controller in DC voltage regulator during transient states of load changing which gives more stability in DC voltage. The results of the simulation are shown. This study demonstrates the ability of STATCOM for regulating the voltage of the transmission system by injecting and absorbing reactive power from the power system, and the DC voltage be more stability by using Fuzzy Logic supervisor.

Optimal Placement Of UPFC For Power Loss Minimization And Voltage Profile Enhancement Using Genetic Algorithm

This paper aims to reduce the power losses and to enhance the voltage profile of the power system while maintaining the loading of the transmission lines within the allowable limits, through the optimal placement of the Unified Power Flow Controller (UPFC).

Impact of Connection Shunt Capacitors On Voltage Of Syrian Transmission Network In Static And Transient Cases

With the increased loading of Syrian power system, the problem of maintaining the voltages within the acceptable ranges has become a major concern in power system planning and operation. The purpose of this research is studying Impact of Connection Shunt Capacitors as facility to improve voltage and evaluate the voltage profile in the Syrian transmission network 230-400kV, determine weak bus bars of voltage, as well as the generation ,the consumption and losses of active and reactive power.

Development electrical drive Vector control system for three phase induction motor Crane Wire, according to the principle indirect rotor field orientation

In this paper, the development of the drive system of the motor Wire port Crane according to the principle of the indirect field orientation. Require the operation of the port Crane operations, different operation situations of variable speed and Torque with time, which is a case dynamic electro and electro-magnetic transient, may affect the performance of operations, so therefore been building motor Wire port Crane operations system corps in winches achieve: - High performance and Efficiency. - Build the desired control system according to the principle of the Pulse Width Modulation (PWM) and the main power system, taking into account the reduction of changes DC-Link voltage and achieve maximum flux before starting the motor. - Reduction of excess Voltage that may appear on a DC-Link, using the brake Transistor with Brake resisters. At the end of the research has been reviewed and the search results that indicate the outstanding performance of the proposed system with the ability to use the same system to run automated processes different.

Assess Power System Voltage Stability Using Neural Networks

The contribution of our research include building an artificial neural network in MATLAB program environment and improvement of maximum loading point algorithm, to compute the most critical voltage stability margin, for on-line voltage stability assessment, and a method to approximate the most critical voltage stability margin accurately. a method to create a (ARTIFICIAL NEURAL NETWORK) approach.

Using Matlab/pdetool to Calculate Electrical Field of High Voltage Insulators

The aim of this study is to calculate the electrical field (EF) of some types of high voltage insulators by using numerical methods. There are different methods, which are used to do this, finite element is the most important one. It is possible to find EF in 2D or 3D systems by using Matlab/pdetool, which distinguishes with big capabilities in calculation and view the results, additionally, it is available, cheap and can save time and money for doing this important calculations in high voltage applications .

Laboratory Investigation about PVC Aging used in High Voltage Cables according to IEC 587

The pollution is one of the most important problems facing the electrical networks, especially in the Syrian Arab Republic, and after that expanded of pollution sources on the one hand, and because the power supply has become related to all economic and daily life sections.

Genetic Algorithm for Maximum Power Point Tracking in Photovoltaic Systems

Photovoltaic systems (PVs)offer an environmentally friendlysource of electricity; however, up till now its price is still relatively high.Achieving the maximum power of these systemsand maintaining it with lowest price in real applications is highly associated with Maximum Power Point Tracking (MPPT) under different operation conditions. This paper proposes the use of Genetic Algorithm (GA) for tracking maximum power point depending on the solar cell model. GA gives, directly and precisely, the optimal operating voltage (VOP) of the cell where the DC/DC converter will be adjusted according to it based on the previous knowledge of the open circuit voltage (VOC) and short circuit current (ISC) of the cell. To validate the correctness and effectiveness of the proposed algorithm, MATLAB R2010a programs for GA and PV system are written and incorporated together where the series resistant of the cell is considered while the shunt resistant is neglected. Simulation results of applying GA on different types of solar panels showedthe possibilityof the accurateadjusting of the voltagetothe optimum valueand thusoperating the systemat maximum power point.

Analytical Study for Leakage Current of Porcelain Insulators under Artificial Pollution Conditions

The polluted insulators problem is one of the most important cases, that faces the electrical networks especially in Syrian Arab Republic because the sources of pollution expand more and more, On the other side, the electrical power supply is related to the operation of all commercial and daily sectors. The environmental pollution on the insulators generally causes general breakdowns in the electrical power supply networks of wide areas, This makes great economical losses in all sectors that are related to electrical network. In this research, the distinct values of insulators pollutions are defined. We then find the relationship between the mentioned values and flashover voltage of polluted insulators in the laboratory. The results of the tests apply on the natural polluted insulators in the outsides. Finally, comparison measurements are made on naturally polluted insulators, and the appropriated procedures to limit the pollution effects .