Topic
PWM rectifier
About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.
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01 Sep 2018
TL;DR: The modeling accuracy of the proposed analytical method to calculate leakage inductances of rectangular winding is confirmed and validates the design methodology of an interleaved zig-zag transformer for a unified ac-dc system.
Abstract: A zig-zag transformer with interleaved secondary windings helps integrate grid (ac) and photovoltaic (dc) power sources in a unified ac-dc power conversion system. Winding leakage inductances of a zig-zag transformer can be utilized as integrated boost-inductances for the PWM rectifier stage, thereby reducing component count and improving overall power density. This paper presents a design methodology of such a zig-zag transformer, suitable for unified ac-dc power conversion system. Using classical approach, appropriate expressions of leakage inductance for windings with rectangular geometry are derived. It is verified using finite element method (FEM) in MagNet. Aiding effect of interleaved winding is examined, which enhances integrated-boost inductance for photovoltaic (PV). An experimental prototype of a 1.0 kW, 415/130 V, 50 Hz delta/zig-zag transformer is built and tested. Thus, analytical calculations are corroborated with the help of 2-D FEM simulation and experimental results. It confirms the modeling accuracy of the proposed analytical method to calculate leakage inductances of rectangular winding and validates the design methodology of an interleaved zig-zag transformer for a unified ac-dc system.
6 citations
Patent•
03 Oct 2007
TL;DR: In this article, the authors propose a utility model for an on-load voltage-regulating transformer used in power distribution networks, in particular, a non-contact and stepless onload voltage regulating transformer, which solves the present technological problems such as the circulation existing between different contacts, burning out of devices caused by improper control, high demand of voltage withstood by thyristor, reduction of transformer safety caused by large amounts and big volume of controllable silicon switch devices and the limitation of regulation precision due to the stepped voltage regulation by two-phase winding multi-group taps
Abstract: The utility model relates to an on-load voltage-regulating transformer used in power distribution networks, in particular, a non-contact and stepless on-load voltage-regulating transformer. The utility model solves the present technological problems such as the circulation existing between different contacts, burning out of devices caused by improper control, high demand of voltage withstood by thyristor, reduction of transformer safety caused by large amounts and big volume of controllable silicon switch devices and the limitation of regulation precision due to the stepped voltage regulation by two-phase winding multi-group taps, etc., which occur in contact switching of automatic voltage regulating devices. The utility model consists of a dynamic voltage regulator, a DSP intelligent controller and a main transformer T . The dynamic voltage regulator consists of a three-phase PWM rectifier, a capacitance energy accumulator, an intelligent inverter, a sine-wave filter and a sequentially connected compensation transformer, which are connected in succession. The two output terminals of the sequentially connected compensation transformer of the dynamic voltage regulator are sequentially connected with the primary winding of the main transformer T of power distribution networks.
6 citations
23 Jun 1996
TL;DR: In this article, an analog current controller is proposed for a three-phase ZVT boost PWM rectifier due to its simplicity, no sampling delay, low cost, etc. Although a six-step operation can be achieved automatically under ideal situations, an improved analog controller has been proposed to deal with problems under unbalanced situations.
Abstract: An analog current controller is very attractive for a three-phase ZVT boost PWM rectifier due to its simplicity, no sampling delay, low cost, etc. Although a six-step operation can be achieved automatically under ideal situations, an improved analog controller has been proposed to deal with problems under unbalanced situations. A comprehensive study and control loop design are presented. A design example for a 6 kW three phase ZVT boost PWM PFC converter operating at 50 kHz is described.
6 citations
13 Jun 2005
TL;DR: In this paper, a single-stage electromagnetic launcher system with two assembled pancake coils fed by two of the modular pulsed power supply units is described, which can be triggered independently by controller with fiber optic transmitters.
Abstract: The impulsive acceleration of active protection elements can preferably be realized by single-stage electromagnetic launcher systems using pancake coils1. In order to produce time varying magnetic field, during the year 2004, a pulsed power system with two modular structured energy packs (300 kJ) has been built up as a basic facility for testing pancake coils systems. Each power supply module comprises 6 capacitors, an improved spark gap switch adapted to 200 kA discharge current, a crowbar diodes, a high frequency PWM rectifier and a well-designed coaxial power line serving as a pulse-forming network Two modules can be triggered independently by controller with fiber optic transmitters. The selection of the launch direction can be changed by a short delay (a few microseconds to 10 millisecond) between the trigger pulses. In order to reduce influence of electromagnetic interference and electromagnetic force and provide high flexibility reliability, we have improved the arrangement of components and structure of pulsed power module. Two modules are designed for a maximum charging voltage of 7 kV and peak current up to 200 kA per module. The paper presented here describes the test facility and the prototype arrangement of launcher system with two assembled pancake coils fed by two of the modular pulsed power supply units described above. Further, the investigations and results will be presented.
6 citations
Patent•
15 Jul 2015
TL;DR: In this paper, an alternating current permanent magnet generator under the control of a PWM rectifier is presented, where the fundamental wave characteristic design is used to complete a motor parameter design and fundamental wave performance verification.
Abstract: The invention discloses a systematic design method for an alternating current permanent magnet generator under the control of a PWM rectifier. The method mainly comprises two parts: a fundamental wave characteristic design and harmonic analysis and verification, wherein the fundamental wave characteristic design is mainly used to complete a motor parameter design and fundamental wave performance verification, and is combined with the control of the PWM rectifier based on a conventional permanent magnet generator design method; the harmonic analysis and verification is used to analyze the current harmonic wave content of a generator stator, the space harmonic wave of an electromagnetic field and the loss generated of the stator in a rotor under the condition of system control based on the existing motor design parameter and judges whether the design requirement is satisfied or not. The method disclosed by the invention inherits the advantages of magnetic circuit computation and parameter calculation analytical algorithms in the existing design method, creates a design method combining the fundamental wave characteristic design and harmonic analysis and verification and solves the critical problems of system, harmonic waves, rotor loss and the like in the permanent magnet generator design and the like which cannot be solved in the existing method.
6 citations