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.
In order to make better use of the existing transmission system, different approaches can be adopted. Previous research shows that both topology control and flexible AC transmission systems (FACTS) can enhance the transfer capability over the existing transmission network and reduce congestion costs. In previous studies, potential cost savings from performing line switching and utilizing FACTS control...
This paper describes a load management system for tactical microgrids that improves load balancing across three phases and provides load shedding capability. A single hardware design comprised of solid state relays enables switching of loads to specific phases during operation or, alternatively, shedding the loads to reduce demand. Load shedding can help alleviate overloading of generators and load...
Power electronic devices are finding increasing applications in the control, instrumentation, and switching in electric power distribution systems. Applications include solid state transformers and solid state fault interruption devices. Some of these devices may be connected directly to the distribution primaries (typically in the 15 kV class). This paper addresses the concerns related to the direct...
In order to improve the power quality of wind power generation system, a direct power control (DPC) strategy of open-winding brushless doubly-fed generator (BDFG) system based on dual converters is presented in this paper. The control method is divided into two parts: the grid side converter control and the machine side converter control. In terms of the grid side converter, a model predictive-based...
This paper presents a mid-voltage experimental voltage generator used for the testing mainly of distribution power equipment, high-power drives and renewable power generation. It utilizes thyristor-controlled zigzag transformer as its primary circuit. Based on the analysis of the operation mechanism, the voltage equations are derived and control strategy is proposed. This power electronic zigzag transformer...
A microgrid is a clear energy system consisting of demand management, storage, generation system and loads which are capable of operating in parallel or independently with the main power grid. There are some issues in the inverter circuit design which are, high frequency switching loss and noise. In addition, an electrostatic generator generates high voltage DC and low current. Any types of wave distortion...
Microgrid systems is the advanced technology for the electric power system which improves the system reliability and stability with the support of RES (renewable energy system) in the power grid. The important aspect of microgrid are the battery, RES and connection with the main grid. In this paper photovoltaic (PV) with battery storage with two different loads for a small scale microgrid system are...
Arc faults are a fire-safety risk in both AC (alternating current) and DC wiring, but reliable detection of arc faults and determining the appropriate response is particularly difficult in DC plug-load circuits. This paper presents the development of AFCI lab setup to characterize DC arc current in DC circuits operating at 24-80 volts. The process to characterize the arc current utilizes the frequency...
RFID enable applications are ubiquitous in our society, especially become more and more important as IoT management rises. Meanwhile, the concern of security and privacy of RFID is also increasing. The pseudorandom number generator is one of the core primitives to implement RFID security. Therefore, it is necessary to design and implement a secure and robust pseudo-random number generator (PRNG) for...
Many real-world systems such as multi-processor computing and power transmission systems have load sharing attribute where the whole system workload is distributed to different system elements. In these systems, when one element fails, other remaining elements would take over the workload which will change their failure behavior and cause a dynamic dependence of failure, thus a reliability evaluation...
Sigma-delta modulation is a method of constructing the radio frequency linear power amplifier with the using non-linear components. It can significantly simplify the structure of the power amplification path, which in this case shall operate as one-bit DACs. The preliminary modeling of potential different variants of the output stage in classes E, F, D (voltage switching and current switching) and...
This paper investigates the event-triggered and self-triggered state feedback control problem of networked control systems(NCSs) with short network-induced delays. The proposed switched system modeling method is able to describe the uncertainty and the time-varying characteristics of the network-induced delays well. In this paper, for NCSs with short network-induced delays, we co-design the event-triggered...
In this paper, we aim to investigate the output group consensus problem for a switching network of heterogeneous linear systems such that outputs of the agents synchronize with each other in every cluster. From the internal model principle perspective, a necessary condition is first derived in terms of the system dynamics. With this necessary condition, a dynamic controller is then designed to solve...
This paper investigates the fault detection and post-filter design issues for a class of discrete-time switched systems. The considered switching signals are of persistent dwell time characteristic, which are more general than the widely used average dwell time even dwell time switching properties. First of all, an observer-based residual generator is formulated, and the asymptotic stability of the...
This paper presents an optimal procedure for controlled electricity black start for electricity distribution grids in reaction to adverse events or malicious cyber attacks resulting in the interruption of the main power supply from transmission network. The islanded operation is supposed to be guaranteed by an electric energy storage system, which covers the network imbalance between demand and supply...
This paper deals with a voltage disturbance generator output characteristics. Usually a microgrid is connected to utility grid through STS to disconnect in case of fault occurrence. The STS should be opened in case of outage, however, it may be connected in case of voltage sag occurrence. The magnitude of surge or over current through the STS is determined by the dip of the sag. The voltage disturbance...
The paper presents an approach to making the complete energy management diagrams for a system composed of renewable energy generators, utility-grid connections and a number of various energy storages. The method is very general and can be applicable to almost arbitrary system configuration that can be defined by components and rules. The system components are categorized according to their roles (source/sink/both),...
In this paper the simple method to reduce the switching energy of capacitive digital-to-analog converters (DACs) in low-power successive approximation register (SAR) analog-to-digital converters (ADCs) is described. The method is based on the well-known monotonic switching procedure and the use of one intermediate voltage level during switching. Unlike most recently published switching methods the...
This paper presents a dual-source energy harvesting circuit that efficiently and simultaneously extracts the energy from a piezoelectric transducer (PZT) and a thermoelectric generator (TEG). The harvester operates in a dual-source pile-up mode (DPM) to efficiently extract the energy from both sources with an increment of the damping force, resulting in a 1452% improvement of power extraction even...
The controller design of servo drives for bandwidth improvement will presented in this paper. The delay issues caused by calculation, fdter and PWM generation, etc. are addressed. The controllers of current loop, speed loop and position loop are designed considering the delay and phase margin. Experimental results show the bandwidth for current, speed and position loops of servo drives are significantly...
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.