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Triplen harmonics are usually not filtered but eliminated by balancing the load and by trapping them in delta-connected transformer windings. The power-factor and the voltage regulation can both be improved if some of the drives in a plant are synchronous motors instead of induction motors, because the synchronous motor can be controlled to supply (or absorb) an adjustable amount of reactive power and therefore it can be used as a compensator. Voltage dips caused by 3 Triplen (literally triple-n) means harmonics of order 3n, where n is an integer.
2001 9:49AM 42 Power systems engineering ± fundamental concepts Fig. 10 Phasor diagram, capacitive load. We can see from this that power-factor correction capacitors (connected in parallel with an inductive load) will not only raise the power factor but will also increase the voltage. On the other hand, if the voltage is too high, it can be reduced by connecting inductors in parallel. In modern high-voltage power systems it is possible to control the voltage by varying the amount of inductive or capacitive current drawn from the system at the point where the voltage needs to be adjusted.
This convention is not universal: for example, in German literature the opposite convention is used. 2001 9:49AM Power electronic control in electrical systems 41 Fig. 8 Phasor diagram, resistive load. Fig. 9 Phasor diagram, inductive load. 8 leading. For each of these three cases, the supply voltage E can be adjusted to keep the terminal voltage V 100 V. For each case we will determine the value of E, the power-factor angle f, the load angle d, the power P, the reactive power Q, and the volt±amperes S.