An improved modulation method is proposed for two parallel three-level interleaved rectifiers to reduce current harmonics and high-frequency zero-sequence circulating current, which uses sinusoidal pulse width modulation. First, a model of the constructed, main factor affecting line performance discussed. Second, are priority optimization target guarantee better performance. Finally, an exchang...

Conventional hysteresis current controllers have the disadvantage of a variable switching frequency. This paper proposes a fuzzy hysteresis band technique for the current control for shunt active power filter (SAPF). An active harmonic filter is used to eliminate current harmonics caused by nonlinear loads. The current control strategy utilizes using a selective Filter STF method to improve pow...

Active power filter are been widely used for harmonic elimination. Harmonics are generated by nonlinear load in ac distribution system. The active power filters are broadly classified as shunt active power filter, series active power filter and hybrid filters. With regard to circuit topology, there are two basic kinds of active filter, voltage source and current source. The series active power ...

This paper deals with an indirect current controlled shunt active power filter (SAPF) for improving power quality by reactive power compensation and harmonic filtering. The presence of harmonics and reactive power in the power source because it will cause additional power losses and malfunctions. The proposed APF is based on a voltage source inverter (VSI). The VSI is controlled by two loops, t...

Active power filter continues to be a powerful tool to control harmonics in power systems thereby enhancing the power quality. This paper presents a fuzzy tuned PID controller based shunt active filter to diminish the harmonics caused by non linear loads like thyristor bridge rectifiers and imbalanced loads. Here Fuzzy controller provides the tuning of PID, based on firing of thyristor bridge r...

In India, the electric power transmission and distribution loss is very high, about 7% in transmission and 26% in distribution. Though deployment of automated meter reading system will reduce losses, particularly in distribution, penetration of automated meter reading is low due to high costs involved. World over, the Two-Way Automatic Communications System (TWACS) is the most widely used power...

Harmonics produced by distributed power generation systems (DPGS) is a main quality issue, particularly due to the number of these connected grid always increasing. This means that, it significant control harmonics caused inverters limit their contrary effects on quality. paper has proposed new proportional current controller (P Resonant Current Controller) with selective harmonic compensator f...

Nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. Many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. Common techniques applied for harmonics measurement and assessment such as FFT have significant errors in presen...