Harmonic and power factor correction by means of active line conditioners with adaptive estimation control

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:6030252

Ashton, R W

Due to the proliferation of power electronic devices in recent years, the amount of harmonic current injected into power systems is on the increase causing undesirable voltage waveform distortion. A new type of versatile Active Power Line Conditioner able to supply a DC load while generating useful harmonics which help reduce the voltage distortion at the connected bus was designed, built and analyzed. The optimum design was obtained by means of an economic study that considers the power loss, the cost of an RFI filter and the effect of the switching rate. An adaptive methodology, requiring only knowledge of the bus voltage distortion, was developed and applied to adjust the amplitudes and phase angles of the injected harmonic currents. This novel approach is based on reducing the voltage Total Harmonic Distortion by minimizing the individual harmonic voltages in an error signal using a gradient method. Through successive adjustments, the difference between the actual bus voltage and the desired bus voltage is minimized. The proposed method can be successfully applied in low and medium voltage networks with multiple nonlinear loads scattered among linear loads.

• Research Organization: Worcester Polytechnic Inst., MA (United States)
• OSTI ID: 6030252
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240202* -- Power System Networks
Transmission & Distribution-- DC Systems-- (1990-)
CURRENTS
DC SYSTEMS
DESIGN
ECONOMICS
ELECTRIC CURRENTS
ELECTRIC FILTERS
ELECTRIC POTENTIAL
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FILTERS
HARMONICS
NOISE
OPTIMIZATION
OSCILLATIONS
PERFORMANCE
POWER SYSTEMS
PULSE CIRCUITS
SIGNAL CONDITIONERS
SIGNAL CONDITIONING
SWITCHING CIRCUITS
WAVE FORMS