sensorless digital control of grid connected three phase
... for renewable energy. Power electronics converters achieve high efficiency, and the price of their components is falling, thus making them even more beneficial for renewable energy applications. Those systems coupled to the grid need to withstand certain utility-defined circumstances which may occur ...
... for renewable energy. Power electronics converters achieve high efficiency, and the price of their components is falling, thus making them even more beneficial for renewable energy applications. Those systems coupled to the grid need to withstand certain utility-defined circumstances which may occur ...
Electrical Machines: II. Synchronous Generators
... The following are the three methods which are used to determine the voltage regulation of smooth cylindrical type Alternators 1. Synchronous impedance / EMF method 2. Ampere-turn / MMF method 3. Potier / ZPF method 1. Synchronous impedance / EMF method Synchronous impedance is calculated from OCC an ...
... The following are the three methods which are used to determine the voltage regulation of smooth cylindrical type Alternators 1. Synchronous impedance / EMF method 2. Ampere-turn / MMF method 3. Potier / ZPF method 1. Synchronous impedance / EMF method Synchronous impedance is calculated from OCC an ...
2300NotesSet21v07
... All of these notations are intended, in part, to remind us of some key things to remember about phasors and the phasor transform. • A phasor is a complex number whose magnitude is the magnitude of a corresponding sinusoid, and whose phase is the phase of that corresponding sinusoid. • A phasor is co ...
... All of these notations are intended, in part, to remind us of some key things to remember about phasors and the phasor transform. • A phasor is a complex number whose magnitude is the magnitude of a corresponding sinusoid, and whose phase is the phase of that corresponding sinusoid. • A phasor is co ...
ECE2120 Prelabs
... • Some of the measuring instruments you will use respond to average values of voltage or current, while others respond to rms values. ...
... • Some of the measuring instruments you will use respond to average values of voltage or current, while others respond to rms values. ...
Synopsis by Sheng Yuan
... that would be obtained if no aberration were present, S I (0) / I (0)0 , here is phase aberration. In this paper, the author obtains simple analytical expressions for the Strehl ratio of images formed by imaging systems with circular or annular pupils aberrated by primary aberrations(third or ...
... that would be obtained if no aberration were present, S I (0) / I (0)0 , here is phase aberration. In this paper, the author obtains simple analytical expressions for the Strehl ratio of images formed by imaging systems with circular or annular pupils aberrated by primary aberrations(third or ...
Standing wave ratio
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line.The SWR is usually thought of in terms of the maximum and minimum AC voltages along the transmission line, thus called the voltage standing wave ratio or VSWR (sometimes pronounced ""viswar""). For example, the VSWR value 1.2:1 denotes an AC voltage due to standing waves along the transmission line reaching a peak value 1.2 times that of the minimum AC voltage along that line. The SWR can as well be defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical.The power standing wave ratio (PSWR) is defined as the square of the VSWR, however this terminology has no physical relation to actual powers involved in transmission.The SWR can be measured with an instrument called an SWR meter. Since SWR is defined relative to the transmission line's characteristic impedance, the SWR meter must be constructed for that impedance; in practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms. Checking the SWR is a standard procedure in a radio station, for instance, to verify impedance matching of the antenna to the transmission line (and transmitter). Unlike connecting an impedance analyzer (or ""impedance bridge"") directly to the antenna (or other load), the SWR does not measure the actual impedance of the load, but quantifies the magnitude of the impedance mismatch just performing a measurement on the transmitter side of the transmission line.