A Hybrid Approach to Compensate Non-linear Loads in Electrical Power Systems.

Abstract

In this paper, a hybrid passive-active power filter is proposed to compensate the non-linear loads in electrical power systems. The main compensation target is to mitigate the load current harmonics. An active power filter can be used to eliminate the load current harmonics, but it is a high cost solution. The use of passive filters are a more economical solution, but the main problem is that these filters cause resonance currents in the system. In this case, two shunt passive LC filters are designed to eliminate the more significant load harmonics. An active power filter, in series with them, is used to improve the filtering characteristics. Besides, it avoids the resonance between the source impedance and the passive filter impedance. This hybrid shunt conditioner is more effective than only a shunt passive filter, and it is a cheaper solution than a shunt active power line conditioner alone. A practical case is presented to check the proposed hybrid conditioner: the compensation of a three-phase diode rectifier.