Analysis and synthesis of harmonic reduction in single-phase inverters using a parallel operation technique with different PWM strategies

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6944366

Kamel, A M

A new technique for harmonic reduction in single-phase inverters, using sinusoidal pulse width modulation (PWM), is presented. A modified circuit based on parallel operation techniques of MOS inverter sets using interphase reactors as current balancers and making use of a specific phase shift between the modulating and carrier waveforms is investigated as a means to economically and efficiently reduce the harmonic contents in the output waveform. In this study, extensions of the natural sampling methods were considered for the PWM strategy, as this method is popular for the single bridge converters. A variety of PWM techniques were investigated analytically using computer simulation. A number of the more promising techniques were tested in the laboratory using commercial signal generators. Finally, a dedicated signal generator was designed and built which implements the best PWM strategy. Good agreement between analytical results and experimental results was observed throughout the project. Detailed analysis shows that the harmonics low than the 15th (or the 29th) are all less than one percent of the fundamental component when the frequency ratio is relatively low 9 (or 15). When the frequency ratio is increased to 45, at low output frequency, harmonics lower than 87th are canceled from the output waveform. This is done without noticeable reduction in the fundamental component. The results show the feasibility of obtaining practically sinusoidal output waveforms.

• Research Organization: Clarkson Univ., Potsdam, NY (USA)
• OSTI ID: 6944366
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
BENCH-SCALE EXPERIMENTS
COMPUTERIZED SIMULATION
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY MIXING
FREQUENCY MODULATION
FUNCTION GENERATORS
HARMONIC GENERATION
INVERTERS
MODULATION
PARALLEL PROCESSING
PHASE SHIFT
PROGRAMMING
PULSE GENERATORS
SIMULATION
WAVE FORMS