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The problem of protecting the power supply of separate units of a mobile robot is quite similar to the problems of protecting the electrical mains. In one case we have to re-distribute the electrical energy due to lack of stability in its consumption, in another case we have to re-distribute the energy due to uneven load on separate units of mobile robots. It is impossible to predict, when this load...
In this paper the analysis of Doubly Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS) is carried out and simultaneously the behavior of DFIG based WECS under normal and abnormal condition is discussed. At rotor side during abnormal condition it is observed that the dc link voltage and rotor speed of DFIG wind turbine increases, whereas the terminal voltage and the active power...
The demand of electricity is soaring rapidly. Distributed generation (DG) is one of the most suitable alternatives to fulfill this swelling demand of energy. DG is a small scale generation which is directly installed in the distribution network or at load centre. Optimal allocation of DG is a vital factor in improving the voltage profile of the system and in reduction of total power losses. DG size...
In this paper, a control of a photovoltaic system connected to the grid is presented. The main components of the studied system are solar arrays connected through a DC bus to a grid side inverter. Due to the instantaneous changes of solar irradiance and temperature, maximum power point tracking (MPPT) is integrated in the inverter control. The energy generated by the grid photovoltaic system is sent...
This paper presents the development of a control scheme for grid tied inverters of renewable energy sources (RES). Hysteresis Current Control (HCC) is carried out in this work. The paper presents results of computer simulation as well as laboratory prototype developed. The experimental results using the hardware developed, proves the simplicity and reliability of the control scheme. Active power transfer...
This paper deals with a new isolated wind-hydro hybrid generation system employing one permanent magnet synchronous generator driven by a variable speed wind turbine and another permanent magnet synchronous generator driven by a constant power hydro turbine feeding three-phase four wire local loads. The proposed system utilizes two back-to-back-connected pulse width modulation controlled insulated-gate-bipolar-transistor-based...
AVR (Automatic Voltage Regulator) is a part of the synchronous generator and it is responsible for regulating the reactive power and voltage level under normal operating terms at different load levels. The modeled system composed of the amplifier, exciter, sensor and proportional-integral-derivative (PID) controller. In order to model the system state space method is used. Also, their specifications...
A wind farm with variable speed wind turbines usually consists of a large number of wind turbine generators (WTGs) connected and operating simultaneously. The study of a wind farm with permanent magnet synchronous generators (PMSG) is presented. The 10 MW wind farm consists of 5 PMSGs based 2MW generators connected to a common DC-bus. Each PMSG of the wind farm is connected to the DC-bus through a...
This article describes aircraft DC generator voltage regulation. The basic principles of an aircraft DC generator and a carbon-pile voltage regulator are explained. The experimental part starts with the creation of a mathematical model of both the aircraft generator and the voltage regulator. Then a simulation of the generator-regulator system in the MATLAB-Simulink program was done. The results of...
This paper proposes a new concept named Flexible, Reliable and Intelligent ENergy Delivery System (FRIENDS) as a future power distribution system. In FRIENDS, new facilities called Quality Control Centers (QCCs), which consists of Voltage Control type Inverters, Distributed Generators (DGs), Energy Storage Systems (ESSs), etc., are installed between distribution substation and customers. By controlling...
One of the most important operational requirements for any electrical power network for both distribution and transmission level is voltage control. Many studies have been carried out to improve or develop new voltage control techniques to facilitate safe connection of distributed generation. In Saudi Arabia, due to environmental, economical and development perspectives a wide integration of photovoltaic...
Due to the uncertainties associated with wind profiles, the load side voltage and frequency control of a wind dominated Remote Area Power Supply (RAPS) system is a challenging task. The performance of such a wind dominated hybrid RAPS system consisting of a diesel generator, fuel cell system, dump load and mains load is investigated in this paper. Integrating a fuel cell into the RAPS system enables...
One of the most important operational requirements for any electrical power network for both distribution and transmission level is voltage control. Many studies have been carried out to improve or develop new voltage control techniques to facilitate safe connection of distributed generation. In Saudi Arabia, due to environmental, economical and development perspectives a wide integration of photovoltaic...
This paper deals with an integrated solid state controller (ISSC) for an isolated asynchronous generator (IAG) used in small hydro power generation for feeding three-phase four-wire loads. The proposed ISSC is used to control the voltage and frequency of IAG. This ISSC is realized using a three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (CC-VSC),...
This paper describes an integrated model for a Photon Exchange Membrane (PEM) fuel cell generator including the power conditioning devices that can be used as a micro grid. The main focus here is the development of a detailed model of the fuel cell, power conditioning devices and a Voltage Source Inverter (VSI) with no major assumptions. To this end nonlinear models for PEM fuel cell generator, power...
This paper deals with investigation on the performance of voltage and frequency controller (VFC) of a wind power generation using a capacitor excited isolated asynchronous generator (IAG) feeding dynamic loads. The amplitude of load currents is estimated using the low pass filter to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage...
Synchronous generator excitation control system is one of the most important parts of power system control. And as PID control is one of the first developed and the most widely used control schemes in excitation system, its parameters tuning problem has been highly concerned. Since MATLAB genetic algorithm toolbox has the characteristics of strong robustness and efficient optimization, this paper...
This paper deals with a voltage and frequency controller (VFC) of a stand-alone wind energy conversion system using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The reference generator currents are estimated using the power balance theory to control the voltage and frequency of IAG system. Two-leg reduced switch integrated voltage source converter (VSC) with a battery...
This paper deals with a decoupled electronic load controller (DELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The proposed DELC is used to control the voltage and frequency in the decoupled manner. The proposed decoupled electronic load controller is combination of a voltage regulator (VR) for regulating...
The paper presents some results of studies conducted on the development of analytical tools useful to allow real time control of voltages and power fluxes in active distribution networks in presence of distributed generation (DG) in the framework of Smart Grids implementation. The analytical tools can nevertheless be useful at the planning stage to guide some choices made by distribution planners...
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