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In this paper, various novel pulse width modulation techniques are analysed, which can enhances the output voltages from five level inverter to multilevel topologies. Multilevel inverters are important for power electronics applications such as flexible ac transmission systems, renewable energy sources, uninterruptible power supplies and active power filters. Three methodologies adopting the constant...
This paper presents a study of determining the optimum operating parameters of a unipolar PWM inverter. Variations on the input voltage level and switching frequency will be investigated to see their impacts on the operation of the inverter and harmonics produced. Results through experimental approach show that careful selections of inverter parameters yield inverter's operation with highest efficiency...
The static synchronous compensator(STATCOM) using power electronics as a shunt device of the Flexible AC Transmission Systems (FACTS) is attracting an increasing interest in power system research and in electric utilities. This paper proposes a novel multi-level structure topology with zigzag transformer for three-level inverter used in STATCOM. Moreover, selective harmonic elimination pulsewidth...
With the application of multilevel inverter in the high voltage and large power occasions in recent years, its modulation strategy has become a research hot point in the field of power electronics. As STATCOM is a typical application of multilevel converter, its common modulation strategies such as Step Wave modulation, Specific Harmonic Elimination modulation, Carrier PWM modulation, Space Vector...
A microcontroller based advanced technique of generating sine wave with minimized harmonics is implemented in this paper. The proposed technique ldquoimpulse-sine productrdquo aims to design and implement a voltage regulated inverter with ripple free and glitch free output sine wave that can operate electronic devices efficiently. The output voltage of the inverter is regulated by a feedback loop...
This paper presents a unique technique suitable for the generation of variable frequency sinusoidal waveforms with high quality. Arithmetic operations on the bit streams are performed through digital blocks. The proposed technique is simple and can be implemented on an field programmable gate array (FPGA). Results of a prototype single-phase inverter module with custom built power stage, are presented...
In this paper the influence of the non-ideal behavior of power electronics, sensors, and signal processing on pulse signal injection based speed sensorless control is addressed and investigated. The speed sensorless control signals are obtained from the transient current response resulting from an excitation of the machine with voltage pulses. The investigation is focused on sensorless control of...
This paper presents development of 200 kW grid connected PV inverter. 200 kW Grid connected PV inverter has the utility frequency transformer for the galvanic isolation between DC and AC, and its output is 3-phase 3-wire 60 Hz, 380 V. P&O algorithm is used for the maximum power point tracking (MPPT) and the active frequency drift scheme for the antiislanding protection. The inverter is controlled...
In the paper, a carrier based two-state PWM technique will be proposed. This method is advantageous for reducing switching losses compared with conventional PWM techniques. Compared with single-state PWM method, it can achieve a better linear control characteristic and harmonic distortion performance. The carrier based PWM approach of the proposed method justifies a flexibility of carrier techniques...
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