The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With the global trend of restructuring in electricity market, providing affordable, reliable and quality electric power by service providers to customers the end users of electric energy are of immerse concern. Several initiatives have been taken by utilities to improve power quality in low voltage electric power distribution network but the inadequate operation/performance of the conventional compensation...
In this paper, we design a controller using H infinity control theory and examine its frequency fluctuation suppressing performance in a small-scale system composed of real machines. The introduction of distributed power sources such as solar power generation and other sources of natural energy into smart power grids has been increasing in recent years. However, given that the amount of power generated...
In the signal phase AC traction power supply system, usually use automatic passing neutral section to maintain load balances of three-phase system, but the automatic passing neutral section is easy to produce overvoltage in power system, it severely imperils the safety of electric system and equipment. Therefore, it is necessity to carry on the analysis to the electromagnetic transient process of...
Quasi-Static-Time-Series (QSTS) simulation is a technique widely used in planning and research to evaluate the power system's behavior in daily, yearly and other time frames. This simulation technique has become increasingly relevant due to the interconnection of Distributed Energy Resources (DER) and unconventional loads into the power grid. It models the control actions performed by devices such...
On the basis of analyzing of ship high voltage power system, established the ship diesel engine, ship high-voltage synchronous generator, excitation controller and load mathematical model, etc. The Matlab/simulink software was used to establish mathematical model and simulation, under sudden reduce and heavy load conditions, obtained the data of ship high voltage power system, including the synchronous...
Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to...
This paper presents the implementation details of a power flow method for unbalanced three-phase distribution networks. The proposed technique utilizes the current injection (CI) method for power flow calculation and considers the modeling of unbalanced loads, load tap-changing (LTC) transformers, and shunts capacitors. Compensation currents are employed for modeling changes in the settings of LTC...
The electric power system is among the most critical infrastructures, being a support for many of them and for key resource sectors. In fact, the complex, digital world around us requires electric power for fundamental aspects of most business and consumer activities. Therefore, it is paramount to assure the correct power supply. Following the increasing trend in electricity generation from renewable...
Large number of substations have been upgraded to higher voltage level by loop in loop out of existing transmission lines to meet the increasing load demand. Therefore; large number of loops of different voltage levels has been created between substations. Transformers of different MVA ratings; percentage impedance and tap ratios have been installed at the substations. Presently there is no coordination...
This paper proposes a derived direct voltage field-oriented control strategy for a DC power system with permanent-magnet synchronous generator, active rectifier and DC-link with capacitor. The proposed control strategy has only one DC-link voltage loop, with adaptive PI controller and active damping. The PI gains are fixed so as to arrive at first-order closed-loop behavior. Simulations and experiments...
The increasing share of renewable energy sources and distributed energy generation (DER) in the energy mix brings a number of challenges to the power system, particularly to the distribution network (DN). New control methods and algorithms are being studied to address these challenges, but the effects of such algorithms on actual DNs are often difficult to validate. Co-simulation, considering the...
This paper presents a novel emergency control scheme capable of predicting and preventing a voltage collapse in a power system, that is modelled as a hybrid system incorporating nonlinear dynamics, discrete events and discrete manipulated variables. Model Predictive Control in connection with the Mixed Logical Dynamical framework is used to successfully stabilize the voltage of a four bus example...
Today's power system network has become more complex and it has more responsibilities and challenges to provide secure, reliable and quality energy supply to the communities. A small entity of electrical network known as Microgrid (MG) is more popular nowadays to enhance reliablity and secure level of energy supply, in case of any energy crisis in the utility network. The MG can also provide clean...
A nonlinear current-mode proportional-integral (PI) controller is proposed for the challenging problem of regulating the output voltage of a dc/dc boost power converter. For the analysis, the accurate average nonlinear model of the boost converter is used, while a new advanced passivity-based nonlinear stability analysis is applied. Particularly, it is firstly proven that the closed-loop system is...
There is mounting pressure on utilities worldwide to incorporate renewable energy sources in their distribution of electricity. The inclusion of distributed generation (DG) on feeders connected to the grid presents significant problems when feeder performance must be assessed. Two issues arising from the inclusion of DG are voltage regulation and reverse power feed. There is variability in the generation...
Nowadays the control and management of the distribution networks are gaining importance due to the increase of the distributed generation (DG) connected to this networks and the increased level of automation of them. Moreover, the distribution network operators (DNOs) are changing their operation method trying to optimize the network operation due to the directives of different governments boosting...
This paper deals with three-phase power system with hybrid transformer (HT). The HT contains conventional transformer with electromagnetic coupling and PWM AC line chopper integrated with secondary windings with electric coupling. The HT is located between distribution system and Local Balancing Area (LBA) with small power local energy sources. After description of the three-phase power system with...
The major issues always attached to conventional electrical Distribution Systems are poor voltage regulation so far the consumers are concerned and the high level of losses & limited or no reserve capacity of the Network so far as the utility is concerned. In this paper, an attempt has been made to address both issues by adding Dispersed Generation of appropriate capacity at appropriate location,...
The simulation model of microturbine generation system has been developed according to the dynamic feature of microturbine. Adopted predictive control theory to control the DC capacitor voltage of the generation system. The response of predictive controller at the load disturbance has been compared to that of traditional PI controller. The simulation results show that the predictive controller has...
The expected large-scale implementation of distributed generation (DG) requires a change in the current structure and operation of distribution networks. The future distribution network must be able to manage power flow in a bidirectional way, cope with uncertainties of renewable power generation and adjust to demands of more sophisticated customers. This paper introduces the concept of a power routing...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.