Objective of compensation is to achieve stable operation when negative feedback is applied around the op amp. Miller - Use of a capacitor feeding back around a high-gain, inverting stage. Miller capacitor only Miller capacitor with an unity-gain buffer to block the forward path through the compensation capacitor. Can eliminate the RHP zero.
In addition, a better understanding of the internals of the op amp is achieved. The minor-loop feedback path created by the compensation capacitor (or the compensation network) allows the frequency response of the op-amp transfer function to be easily shaped.
It is observed that as the size of the compensation capacitor is increased, the low-frequency pole location ω1 decreases in frequency, and the high-frequency pole ω2 increases in frequency. The poles appear to “split” in frequency.
Series capacitors are very effective when the total line reactance is high. Series capacitors are effective to compensate for voltage drop and voltage fluctuations. Series capacitors are of little value when the reactive power requirements of the load are small.
Series capacitors are of little value when the reactive power requirements of the load are small. In cases where thermal considerations limit the line current, series capacitors are of little value since the reduction in line current associated with them is relatively small.
This is a serious drawback, as the supply of reactive power by a capacitor drops when it is most needed; series capacitors are used to compensate for the inductive reactance of the loaded overhead power lines.
OverviewAbsorption and production of reactive powerNeed for voltage controlReactive power reservesSee alsoSources
Devices absorb reactive energy if they have lagging power factor (are inductor-like) and produce reactive energy if they have a leading power factor (are capacitor-like). Electric grid equipment units typically either supply or consume the reactive power: • Synchronous generator will provide reactive power if overexcited and absorb it if underexcited, subject to the limits of the generator capability curve.