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This paper identifies the issues of using the bus/branch model for operations studies for current hour, next hour and future hours. Need for node/breaker model for contingency analysis is discussed. Major improvements needed to bus/branch model for contingency analysis in the area of contingency definition and contingency analysis is presented. Need to model Remedial Action Schemes (RAS) independent...
Power electronic circuits are now widely used in latest technologies that range from automobiles to mobile phones and many more such areas encountering our day to day life. Small signal methods are widely used for modeling power electronic circuits. This modeling technique gives an exact model which is quite suitable for analyzing a circuit sampled at switching frequency. The target of this research...
The capacity of Gaoling BTB HVDC project reaches 3000MW, while the North China side of the project is weak in structure. It is a typical case of massive DC power feeding into weak AC systems. The study of its stability control strategies is unique. In this paper, a stable operation limit and security control measures after severe faults in the DC and nearby AC system is developed by comparing the...
Switch Reluctance Machine has remarkable characteristics which make it suited for industrial application. Their robustness and simple structure are main attractive features of this kind of machines. With increasing the electrical energy demands, SR machine due to their inevitable and desirable characteristics is utilized as generator. In this paper, a 12/8 field-assisted Switched Reluctance Generator...
A closed-loop mc × nc -stage switched-capacitor-voltage-multiplier boost inverter (SCVMI) is proposed by combining phase generator and sinusoidal-pulse-width-modulation (SPWM) control for low-power boost DC-AC conversion/regulation. The power unit contains: SCVM booster (front) and H-bridge (rear). This booster consists of two mc -stage SC cells and two nc -stage SC cells in series, and these cells...
In an all electric ship, the intelligent and integrated power system (IPS) that allows for reconfiguration offers better fight-through and survivability capabilities compared to manual service restoration. Automated reconfiguration involves optimizing the status of switches (ON/OFF) such that power delivered to loads is maximized after the occurrence of a fault. The priority is given to vital loads...
Control system of micro-plasma arc welding machine, including timing control system and parameters control system, has been studied deeply. Based on the study on timing control system and parameters control system, their models were established by automatic control theory, and systems' model simulation was implemented and analyzed by means of Simulink/Matlab. It was showed that the model of timing...
Recently, Green IT has attracted much attention to solve economical and environmental problems. To save energy in communication systems, Energy Efficient Ethernet (EEE) has recently begun to explore rate adaptation for energy savings. We study the performance impact of traffic patterns on energy consumption via simulation. To evaluate the energy saving performance according to the traffic patterns,...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
This paper describes a design flow for the circuit-level optimization of a technology. The concurrent exploration of device characteristics and library design choices leads to a more application-optimal technology. We illustrate the design flow by: 1) analyzing the impact of buffer cell design, and 2) by optimizing a 130 nm technology for low operational power.
This paper describes a methodology for building a reliable internet core router that considers the vulnerability of its electronic components to single event upset (SEU). It begins with a set of meaningful system level metrics that can be related to product reliability requirements. A specification is then defined that can be effectively used during the system architecture, silicon and software design...
It is very important for power systems to execute emergency control when large disturbances occur in the systems. Based on the principles of switching control, a new switching model is first formulated for a two-machine power system in this paper. Then, the new model, called switched two-machine power system, is expressed as the form of a switched dissipative Hamiltonian system, and the stability...
Automated test case generation from behavioral models like finite state machines (FSMs) and statecharts has long been studied. Environments that enable a test designer to model a real complex software and to obtain test cases to validate such a software are mandatory in an automated test approach. This paper presents an environment, GTSC, which enables test sequences to be obtained from both Statechart-based...
In this paper we discuss performance results of a novel real-time closed-loop power amplifier (PA) linearization technique that has originally been proposed by Ahmed and Li. The novel approach performs on-the-fly prediction and measurement of the PA AM/AM and AM/PM non-linearity, stores such non-linear characteristics and calculates their inverse functions in order to pre-distort the base-band amplitude...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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