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The Improved Power Quality AC-DC Converters (IPQCs) provides enhanced power quality in terms of improved power factor and reduced Total Harmonic Distortion (THD) at the utility interface. This paper addresses the power factor correction techniques for high frequency isolation based single phase Buck-Boost AC-DC Cuk Converter, which consists of only one switch resulting in reduced THD and improved...
In this paper forced switching control of three-level Neutral Point Clamped (NPC) ac-dc converter having rectification and regeneration capability is presented. This converter is utility friendly and maintains the dc-link voltage constant. Hysteresis current controller (HCC) is used for current control because of its simplicity, easy implementation and good dynamic performance. The comparison of a...
Industrial and traction drives (used in automobile and electric locomotives) using induction motor, require a good control over torque and speed, reversible and regenerative speed control operation. Hence the drive topology requires both ac to dc conversion and dc to ac conversion system. In this paper, a three-level utility friendly the front-end neutral point clamped (NPC) converter system having...
This paper presents the development of single phase AC/DC/AC converter using three-leg inverter. A uniform fixed switching frequency method of current control for both AC/DC and DC/AC converter stages has been proposed. A multiple control loop is used to control the input AC current and DC link voltages of the AC/DC converter and a cascaded H-bridge multilevel inverter (CHBMLI) is used to obtain the...
AC-to-DC converters based on one-cycle control (OCC) exhibit instability in current control when operating in the inverting mode. A modified OCC based controller has been presented in literature which overcomes the above-mentioned limitation. But, it needs to sense instantaneous phase voltages to generate fictitious current components. In an effort to dispense with the voltage sensors of the modified...
New nonlinear current control methods are developed for single-phase power factor corrected (PFC) AC-DC converters. The control methods combine input current feedforward with partial feedback control based on the switch current to achieve sinusoidal input current and unity input power factor. The nonlinear control methods don't suffer from the limitations of conventional linear (average) current control...
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