This paper presents a novel method for performing automatic power quality diagnosis to identify the causes of short duration voltage disturbances such as voltage sags and swells. Such voltage disturbances can be caused by permanent or non permanent faults. A permanent fault causes permanent damage and power interruption to the customers whereas a non permanent fault can be categorized as either...

Three solutions for novel distribution automation implemented in medium voltage networks were developed as a theoretical study. The distribution automation studied included intelligent local automation arrangements also useable for ringtype networks. The profitability of the new technique was evaluated by comparing the costs of the automation investments to the savings obtained in the economic ...

Static random access memory (SRAM) circuits optimized for minimum energy consumption typically operate in the subthreshold regime with ultra low-power-supply voltages. Both the read and the write propagation delays of a subthreshold memory circuit are significantly reduced with an increase in the die temperature. The excessive timing slack observed in the clock period of constant-frequency subt...

The implementation of analog CMOS circuits that operate in the very low power supply voltage range (1 V to 2 V) becomes more important nowadays. Most accurate filter circuits are designed in the switched-capacitor technique. The existing design techniques require, however, the on-chip generation of a higher voltage by means of a voltage multiplier. In this paper, a novel technique, derived from...

Voltage sag compensator is very important in power quality. Its performance also depends on the types of sag detection techniques used. Sag detection technique determines the dynamic performance of a voltage-sag compensator. Many techniques have been introduced to measure and to detect voltage sag, such as RMS-Value Evaluation and Peak-Value Evaluation. Unfortunately, most of the techniques req...

Abstract—This paper presents a grid synchronization technique based on adaptive notch filter for SPV (Solar Photovoltaic) system along with MPPT (Maximum Power Point Tracking) techniques. An efficient grid synchronization technique offers proficient detection of various components of grid signal like phase and frequency. It also acts as a barrier for harmonics and other disturbances in grid sig...

The use of multiple voltage settings for dynamic power management is an effective design technique. Recent research has shown that testing for resistive bridging faults in such designs requires more than one voltage setting for 100% fault coverage; however switching between several supply voltage settings has a detrimental impact on the overall cost of test. This paper proposes an effective gat...

PWM inverters ideally shift the output voltage spectrum around the switching frequency. Thus ideally PWM inverters do not introduce any significant lower order harmonics. However, in real systems, due to deadtime effect, device drops and other non-idealities lower order harmonics are present. In order to attenuate these lower order harmonics and hence to improve the quality of output current, t...

Low power has played an increasingly important role for embedded systems. To save power, lowering voltage and frequency is very straightforward and effective; therefore dynamic voltage scaling (DVS) has become a prevalent low-power technique. However, DVS makes no effect on power saving when the voltage reaches a lower bound. Fortunately, a technique called dynamic pipeline scaling (DPS) can ov...