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A seven-level converter based on the cascaded connection of a three-level active neutral-point-clamped (ANPC) converter and individual H-bridge cells per phase is presented in this paper. This converter only requires a single DC source for all three phases and extends the amplitude of output voltage of the converter with similar DC-link voltage. The operation principles and control strategies based...
Under unbalanced grid conditions low order harmonic appears both at the DC output and AC inputs of the converter. Such harmonics lead to deterioration of performance of the system. This paper presents a novel feedback-based controller, which regulates directly converter voltages to eliminate of the 2nd ripple of DC link voltage to alleviate the stress of DC-link capacitor and to reduce the 3rd harmonic...
The main objective of this paper is to implement a nonlinear control for a PWM voltage source converter with a reduced number of sensors. For this purpose an input-output feedback linearization control strategy is firstly implemented in order to control both the line current and the DC output voltage. Next, an estimator of the AC mains voltage is implemented so as to reduce the number of the requested...
Stability is the intrinsic attribute of a system. A stable system may work well and effectively. For some PWM controlled converters, low frequency may occur in the output voltage and results in unsteadiness of the system. In this paper buck converters are taken as an example to investigate the stability feature. A delay in the feedback loop is related with stability closely, so the converter with...
An adaptive reference tracking driving technique is proposed to minimize the boost output voltage oscillation and improve the power efficiency when the digital pulse width modulation dimming is enabled. An asynchronous 1 MHz DC/DC converter with a dynamic resistor implements the minimum voltage reference tracking technique. Therefore, high efficiency and a stable boost output voltage can be guaranteed...
For PWM DC-DC converters, keeping the output voltage steady is very important. When the input voltage has a step change, up impulse or down impulse voltage will occur in the output. Both the magnitude and the duration time of the over voltage are severely influencing to the whole system, which will destroy or disorder the circuit. Step-down converter is used as an example to investigate the input...
This paper presents a simulation work and control aspects of a Booster Dipole magnet power supply to a light source. Description of structure, operation of the structure and synchronous rectification Buck converter are discussed. Voltage and Current mode controllers for one-quadrant and two-quadrant converters are proposed. Better performance results with Split-Range technique are obtained. The converters...
Voltage sags and extended under voltages have the largest negative impact on industrial productivity and could be the most important type of power quality variation for many industrial and commercial customers. This paper proposes a 3-phase PWM ac-ac Cuk converter with minimum switches to maintain constant output voltage irrespective of the variation of input voltage and load. By PWM duty ratio control...
The doubly-fed induction generator (DFIG) is a 'special' variable speed induction machine widely used in modern large wind turbines. It is a standard, wound rotor induction machine with its stator windings directly connected to the grid and its rotor windings connected to the grid through a back-to- back PWM converter. The DFIG power generation consists of power delivered from two paths, one from...
Instantaneous values of input line-to-line voltages control method is one of the important control strategies for matrix converter. By using this control method the compensation of the asymmetrical input source voltages is easily achieved. However, many researchers focus on pursing a new control strategy for this method due to the complexity of the previous control strategy and difficulty of its realization...
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