This paper describes two related topics. First, it is shown how the concept of the MOSFET-C integrator can be extended to single-amplifier filter biquads. Then a new differential-input balanced-output current conveyor (CCII) is presented, which has two essentially symmetrical and balanced signal paths. Using this CCII, a 4th-order lowpass filter cascade suitable for on-chip tuning is presented,...

The most popular and best modulation method used among Pulse Width Modulation (PWM) technique is Space Vector Modulation (SVM) method. SVM generates low Total Harmonic Distortion (THD) and it is well suitable for motor control. Harmonics is one of the major power quality issues occurring in most of the application. SVM holds the major advantage that only one switch is turned on at a time. The p...

This paper discusses the design of a repetitive feedback controller for a grid-connected two-level three-phase voltagesource inverter connected between a DC source and the grid through an LCL filter. The controller incorporates a classical two loop feedback of the output current and the capacitor current in addition to a repetitive feedback loop. The results show that the proposed technique imp...

The new standard C37.118.1 lays down strict performance limits for phasor measurement units (PMUs) under steady-state and dynamic conditions. Reference algorithms are also presented for the P (performance) and M (measurement) class PMUs. In this paper, the performance of these algorithms is analysed during some key signal scenarios, particularly those of off-nominal frequency, frequency ramps, ...

Abstract-This paper presents a comprehensive simulation study of PI Controlled Three phase Series active power filter to improve power quality. The series active power filter employs a method for the reference compensation current based on Fast Fourier Transform Passive, L-C filters have disadvantage of fixed compensation and not fit for fast varying condition while by using auto tuned active p...

Harmonics in electrical distribution systems are created from a number of sources and produce a variety of undesirable side effects. It is therefore important to understand all solutions that are available. Phase shifting will be reviewed as one concept for solving certain types of problems related to power quality. Both theoretical concepts and a case study are presented. Index Terms – Harmoni...

Phosphorus (P) is a primary limiting nutrient in rivers and streams, and excessive P results in eutrophication of freshwater systems, in turn, excessive algal growth/toxic algal blooms, oxygen depletion, and water quality degradation. This study analyzed P pool, and hydrolysis of organic P (OP) by native phosphatases (NPase) in the water samples collected in the Bronx River. The soluble reactiv...

This paper presents a comparative study on two control strategies for induction motor drives: Scalar Control Method and Direct Torque Control (DTC) Method. The comparison is based on various parameters like speed, torque and stator current THD. Based on that it can be concluded that Direct Torque Control (DTC) is better than Scalar Control Method. The study is done by simulation using the simul...

Neutral-point-clamped converters are increasingly applied in industrial drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage total harmonic distortion(THD), and can develop low common mode voltage. Several distinct modulation strategies have been proposed in the past for eliminating the common mode voltage, providing low THD...

The location of a well related to surface drainage ways is important in determining the potential for groundwater contamination from surface water flow. Locating a well in a safe place needs careful consideration and planning.To determine the effects of well depth on water quality, the wells up to 4 m. depth and 100 m. far from river were selected in Isfahan. Geologically, the earth in this zon...