Power Electronics

Collection by Sajib Barua

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double circuit transmission lines . Power Engineering, Electrical Engineering, Electrical Panel Wiring, Generator Transfer Switch, Physics Tricks, Power Lineman, Transmission Tower, Bill Of Materials, Power Electronics

Power Transmission

High-voltage transmission is carried by means of AC overhead transmission lines and DC overhead transmission lines and cables. Ancillary equipment such as switch-gear, protective equipment and reactive power support equipment is needed for the correct functioning of the transmission system.

Thyristor switched capacitor is defined as 'a shunt-connected, thyristor-switched capacitor whose effective reactance is varied in a stepwise manner by full- or zero- conduction operation of the thyristor valve'. Power Electronics

The thyristor-switched capacitor (TSC)

Thyristor switched capacitor is defined as 'a shunt-connected, thyristor-switched capacitor whose effective reactance is varied in a stepwise manner by full- or zero- conduction operation of the thyristor valve'.

Thyristor-controlled equipment Power Electronics

Thyristor-controlled equipment

Increasing the gating angle (reducing the conduction angle) has two other important effects. First, the power losses decrease in both the thyristor controller and the reactor. Second, the current waveform becomes less sinusoidal; in other words, the TCR generates harmonic currents. If the gating argles are balanced, (i.e. equal for both thyristors), all odd order harmonics are generated, and the rms value of the nth harmonic component is given by ...

Switching transients in the general case Power Electronics

Switching transients in the general case

Under practical conditions, it is necessary to consider inductance and resistance. First consider the addition of series inductance in Figure 6.16. In any practical TSC circuit, there must always be at least enough series inductance to keep di/dt within the capability of the thyristors. In some circuits there may be more than this minimum inductance. In the following, resistance will be neglected because it is generally small and its omission makes no significant difference to the…

The simple case of a switched capacitor, with no other circuit elements than the voltage supply, is used first to describe the important concept of transient-free switching. Figure shows the circuit. Power Electronics, Circuit, Concept, Free

Switching transients and the concept of transient-free switching

The simple case of a switched capacitor, with no other circuit elements than the voltage supply, is used first to describe the important concept of transient-free switching. Figure 6.16 shows the circuit.

The thyristor-controlled transformer (TCT) Step Down Transformer, Power Electronics, Transformers

The thyristor-controlled transformer (TCT)

Another variant of the TCR is the TCT (Figure 6.9). Instead of using a separate step- down transformer and linear reactors, the transformer is designed with very high leakage reactance, and the secondary windings are merely short-circuited through the thyristor controllers

Current trends in power semiconductor technology Power Electronics, In This Moment, Technology, Trends, Tech, Engineering, Beauty Trends

Current trends in power semiconductor technology

For this converter bidirectional self- commutated devices are needed to build the converter. At the moment research efforts show some promising results (Heinke et al., 2000). However, a commercial product is probably not going to be available before the next decade or so.

Protection of semiconductors - snubber circuits Power Electronics, Circuits

Protection of semiconductors - snubber circuits

The relative magnitudes of the conduction and switching losses are greatly dependent on the type of the converter (i.e. resonant, quasi-resonant, PWM, etc.), the operating frequency, the type of the load (i.e. linear or non-linear, resistive or inductive), and certain characteristics of the switch itself (i.e. turn-on time, turn-off time, etc.). Off- state losses are generally a very small portion of the total losses and are considered negligible.

Power modules Power Electronics

Power modules

Many other components must be used to make a converter topology function properly to shape the voltage and current supplied from the source to the ones required by the load in a regulated manner and in many cases allow the power flow to be bidirectional. Components such as inductors, capacitors and resistors must be used not only as part of protection devices in the case of snubbers, but also as filter elements.

Desired characteristics of fully-controlled power semiconductors Power Electronics, High Voltage

Desired characteristics of fully-controlled power semiconductors

High forward and reverse voltage blocking ratings. In order to achieve higher power ratings for a given converter, many switches are connected in series to build a valve especially for high and ultra-high power applications. lf new devices become available with higher voltage ratings, the number of the required switches connected in series to produce the same valve will be reduced. This will minimize the problems with the voltage sharing of the various switches in series, will increase the…

Power semiconductor devices and converter hardware issues Power Electronics, High Voltage, Hardware, Computer Hardware

Power semiconductor devices and converter hardware issues

The advances of high voltage/current semiconductor technology directly affect the power electronics converter technology and its progress. The 'perfect' high-power semiconductor is yet to be fully developed and become commercially available.