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DC-DC converters are the heart of any switched mode power supply (SMPS) system. Rather than using multiple number of DC-DC converters for regulating voltage of each of the outputs in a multi-output SMPS, the reliability and cost-effectiveness can be improved if a single DC-DC converter is used and viable control technique is employed to regulate the voltages effectively. This paper deals with such...
An isolated Zeta converter is proposed as a power factor correction (PFC) converter with DC link voltage control for speed control of a permanent magnet brushless DC motor (PMBLDCM). The voltage source inverter (VSI) is used as an electronic commutator of PMBLDCM. The proposed converter performs the PFC action and DC link voltage control in single stage using only one controller. The current multiplier...
In this paper, a new 12 kW single stage modular ac-dc converter is presented with unity power factor for telecom power applications. The combination of three single phase modules and a virtual neutral terminal device is a powerful method to design a three-phase modular converter system with power factor correction. It is based on the principle of connecting three single-phase modules in a three-phase...
Doubly Fed Induction Generators (DFIG) has emerged as a suitable alternative for conversion of wind energy to grid quality energy under varying wind conditions. Often the control mechanism use large number of sensors and employ complex computations. Moreover, the reported control schemes for DFIG employing grid side converter (GSC) do not ensure a drawl of unity power factor (upf) sinusoidal current...
This paper deals with a Cuk DC-DC converter as a single-stage power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) fed through a diode bridge rectifier (DBR) from a single-phase AC mains. A three-phase voltage source inverter is used as an electronic commutator to operate the PMBLDCM driving an air conditioner compressor. The speed of the compressor is controlled...
This paper presents a quantitative analysis of the advantages of a grid connected doubly fed induction generator (DFIG) for wind energy conversion systems (WECS) over the other available variable speed WECS. The WEC system includes back-to-back connected PWM voltage source converters (VSC) in the rotor circuit of the DFIG. The control strategy implemented is - unity power factor operation of the machine...
This paper deals with the analysis, modeling, and control of a doubly-fed induction generator (DFIG) driven by the wind turbine. A control technique is presented for extracting the maximum power from the wind turbine. The wind energy conversion system (WECS) is equipped with a DFIG and two back-to-back connected voltage source converters (VSCs) in the rotor circuit. The proposed control technique...
This paper deals with a new Autonomous Wind Energy Conversion System (AWECS) employing parallel operated Permanent Magnet Synchronous Generators (PMSGs) driven by variable speed wind turbines and feeding three-phase four-wire local loads. The proposed system utilizes three Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source converters (VSCs) with a battery energy...
This paper, first, develops the reactive power capabilities of wind power generator and then discusses reactive power ancillary services issues related to the wind farms in the electricity market. Presently, the doubly fed induction generator (DFIG) system, with partial rated power electronic converters in the rotor circuit, is the most popular and widely used for the wind power generation due to...
STATCOM with active power (energy) source provides an effective impact on transmission system. Although both the traditional STATCOM output voltage magnitude and phase angle can be controlled, they cannot be independently adjusted in steady state since the STATCOM has no significant active power capability. In this paper a study is carried out to compare the performance of STATCOM and Battery Energy...
This paper aims at a power factor corrected (PFC) buck bridge DC-DC converter for a permanent magnet brushless DC motor (PMBLDCM) for an air conditioner. This PFC converter is fed from a single-phase AC mains through a diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The Speed of the proposed PMBLDCM drive is controlled to improve efficiency of the...
In this paper, a buck half-bridge DC-DC converter is used as a single-stage power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of this PFC converter is a diode bridge rectifier (DBR) fed from single-phase AC mains. The PMBLDCM is used to drive a compressor load of an air conditioner through a...
This paper deals with an integrated electronic load controller (IELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The IELC is realised using a star/delta transformer and three-leg insulated gate bipolar transistors (IGBTs) -based current controlled voltage source converter (VSC) with a DC capacitor, a chopper...
This paper aims at a boost bridge DC-DC converter as a single-stage power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) driven air conditioner. This PFC converter is fed from a single-phase AC mains through a diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The proposed PFC boost bridge converter based PMBLDCM...
This paper aims at the application of a half bridge DC-DC converter as a power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) driven air conditioner. This PFC converter is fed from single-phase AC mains through diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The proposed PFC half-bridge converter based PMBLDCM...
Analog to digital converters are an important system building block, as an interface between analog and digital world. Parallel comparator type (flash) ADCs is used in high speed, low resolution applications. This paper presents the characterization analysis of CMOS flash ADCs under Threshold inverter technique for different resolutions, the effect of the VLSB (step size) of the comparator on the...
This paper deals with an isolated wind-hydro hybrid generation system employing one Permanent Magnet Synchronous Generator (PMSG) driven by hydro turbine and another PMSG driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source...
This paper deals with an isolated wind-hydro hybrid generation system employing a Squirrel Cage Induction Generator (SCIG) driven by hydro turbine and a Permanent Magnet Synchronous Generator (PMSG) driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors...
This paper deals with a control algorithm for two parallel operated Doubly Fed Induction Generators (DFIGs) driven by wind turbines in a three phase four wire autonomous system feeding local loads. The proposed Autonomous Wind Energy Conversion System (AWECS) is using back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source converters (VSCs)...
A detailed investigation is made into the causes, standards, and remedies of the excessive neutral current. A reduced-rating voltage-source converter with a zig-zag transformer as a distribution static compensator is proposed for power-quality improvement in the three-phase four-wire distribution system. The proposed DSTATCOM is employed for the compensation of reactive power, harmonics currents,...
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