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EPE 2009 - Subtopic 05-7 - DS: 'Fault Tolerant Power Converters and Power Converter Control'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 05: 'Hard Switching Converters and Control' > EPE 2009 - Subtopic 05-7 - DS: 'Fault Tolerant Power Converters and Power Converter Control'
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	A FAULT TOLERANT DIGITAL CONTROLLER FOR POWER ELECTRONIC APPLICATIONS   By Rammohan Rao ERRABELLI, PETER MUTSCHLER	[View]   [Download]
Abstract: In safety critical applications, fault tolerant controllers are very important. In this paper a generalized fault tolerant digital controller for power electronic applications is presented. Three fixed point Digital Signal Processor (DSP) based controllers are used in parallel, running the same control algorithm. The PWM outputs of three DSPs are voted out to one PWM output using a simple fault tolerant majority voting logic. The fault tolerance of digital control system is verified using Field Oriented Control (FOC) for a Permanent Magnet Synchronous Motor (PMSM).
	A methodology for developing chainlink converters   By Colin OATES	[View]   [Download]
Abstract: “Chain circuits or “Chainlink converters” include the Modular Multi-Level Converter (M2LC) [1] and the multilevel Static Compensator (StatCom) [2]. They use large numbers of identical series connected modules, each of which contains a capacitor that can be switched in or out of circuit to present a continually variable voltage at the converter terminals. The technique permits multilevel converters to be constructed without the disadvantages associated with other multilevel topologies and have created major interest for high voltage power transmission applications since complex waveforms can be constructed without the filtering associated with converters utilising PWM. The approach proposed is to operate converter topologies built up from combinations of chain circuits as sets of individual current sources. These are arranged as a matrix form so the current from the input and output terminals are able to circulate through all the chain elements in a subtractive manner. To maintain the capacitor charge level in each chain circuit the net power flow must be zero which can commonly be achieved only for AC to AC or AC to DC power conversion. Additional control is required to trim the operation of the chains to ensure average capacitor voltage in a chain is constrained to a defined level, although the simulation results presented do not include this. An example of a topology that can be derived by this approach is the Matrix Chainlink converter that can directly convert three-phase AC to three-phase AC. A second topology is proposed that will give a AC to 4 quadrant DC converter form that will yield a galvanically isolated DC to DC converter.
	Comparison of gate drive circuit configurations for improvement of switching transients in space efficient matrix converter   By Alvis SOKOLOVS	[View]   [Download]
Abstract: The EPE 2009-team regrets to inform you that this full paper (or in case of invited lectures: presentation) was not uploaded before the deadline of our conference.
	Control Strategies for a Novel Inverter which can Independently Control Two Permanent Magnet Synchronous Motors   By Nobukazu HOSHI, Norihiro ASAHI	[View]   [Download]
Abstract: Electric vehicle (EV) is expected as a solution for protecting the global environment. In EV, safety and design-flexibility can be improved by configuring two or more-wheel drive which uses in-wheel motors. As in-wheel motor, permanent magnet synchronous motor (PMSM) is suitable at the viewpoints of the power density and the efficiency. However, a PMSM requires a three-phase inverter; thus, two-wheel drive vehicle using two PMSMs requires two three-phase inverters in conventional. As a solution for this problem, several inverters which consist of less semiconductor power devices compared to conventional three-phase inverter and can independently control two PMSMs are proposed. One of them is the proposed inverter, which consists of only six switching devices. This paper described control strategies for the proposed inverter. One is sinusoidal PWM control and the other is current control based on instantaneous value. The characteristics of the control schemes are compared through simulations and experiments. In addition, the advantages and disadvantages of the proposed inverter are described. The proposed inverter can be constructed by only six switching devices as same number as a conventional three-leg inverter, though output voltage is about one-third of the conventional.
	Double Boost Effect Topology for Three-phase AC/DC Converter with Unity Power Factor   By Jean-Claude LE CLAIRE	[View]   [Download]
Abstract: This paper describes a three-phase AC/DC power converter involving a simple rectifier topology, which operates in PFC mode. This topology is close to another known, i.e. the VIENNA one. Two coils are involved in each phase. This permits to get a “Double Boost Effect” and improves the rectifier features. The mains currents are under control of three analog self-oscillating controllers. Simulations and experimental results illustrate the operation of the single and three phase rectifiers.
	Emulation of faults and remedial control strategies in a multiphase power converter drive used to analyse fault tolerant drive systems for Aerospace Application   By Liliana DE LILLO, Lee EMPRINGHAM, Patrick WHEELER, Sudarat KHWAN-ON, Christopher GERADA	[View]   [Download]
Abstract: This paper describes how an experimental test rig, a multiphase power converter drive and its control have been used to emulate failures (of the converter and machine) and control strategies to study a way of achieving fault tolerant drive systems employed especially in Aerospace applications. Experimental results which validate simulation of the emulated faults are presented
	Failure Characteristics of Motor System Using Distributed Inverters for PMSM   By Masakazu NAGAISHI	[View]   [Download]
Abstract: A motor control system driven by multiple distributed inverters has been proposed until now to improve the robustness and the fail-operational control performance of motor drivers just after some of the inverters break down. Its failure characteristics are examined and analyzed by some experiments using a permanent magnet synchronous motor (PMSM) with eight poles and twelve windings. The proposed control system consists of four current controllers and inverters which are installed in parallel between the velocity controller and the motor. In the experiment, the proposed system could keep the commanded velocity without any instability of the system even after three inverters failed at the same time.
	Fast Dynamic Response Multilevel Converter for Voltage Tracking Applications   By Miguel RODRIGUEZ, ALBERTO RODRÍGUEZ, pablo FERNÁNDEZ, JAVIER SEBASTIÁN	[View]   [Download]
Abstract: The envelope tracking technique is used to increment the efficiency of modern radiofrequency transmitters. It is based on supplying the linear radiofrequency power amplifier of the transmitter with a time-varying voltage that tracks the envelope of the information signal being transmitted. These systems require a converter capable of varying its output voltage very fast and a control system able to acquire the envelope reference signal and generate the adecquate control signals. This paper presents a digitally-controlled multilevel buck converter suitable to supply radiofrequency power amplifiers: it achieves high efficiency, low output voltage ripple and high tracking bandwidth. An hybrid pulse-width modulation system implemented in a FPGA generates the appropriate control pulses for the transistors, which are drived from an especial floating driver scheme. The proposed system is tested using a resistive load that simulates the amplifier behaviour, and it is demonstrated that it is able to track an arbitrary envelope signal.
	High performance ac-dc notebook PC adapter meets EPA 4 requirements   By Alberto STROPPA, Claudio SPINI, Claudio ADRAGNA	[View]   [Download]
Abstract: This paper presents the characteristics and the performance of a 75W-19V ac-dc adapter for notebook PC tailored on the latest Energy Star Program requirements. The power supply is composed of a front-end PFC pre-regulator and a Flyback downstream converter. An innovative PFC control circuit sensing both the input and the output voltages through an auxiliary winding is the key element in achieving the desired performance. A prototype board has been implemented and test results are reported.
	The Usage of a PWM Rectifier to Improve Three-Phase Induction Motor Drive’s Performance under Fault Conditions   By João CASEIRO, André MENDES, António CARDOSO	[View]   [Download]
Abstract: Reliability and power quality are two aspects of motor drives which have been gaining the attention of the industry. In fact, as the processes increased in number and complexity, the criticality of each component also increased. This paper proposes the usage of a PWM rectifier to accomplish a fault-tolerant motor drive with optimal performance and power quality. The system uses a hardware reconfiguration, which requires no additional hardware components, to isolate any inverter semiconductor fault. Additionally, in order to guarantee system full performance, under faulty operating conditions, a PWM rectifier is used to adjust de DC link voltage. The detection and location of the fault is obtained by using a new diagnostic technique based on the Average Current Park’s Vector Approach, which can be readily integrated in the drive control system. The strategy guarantees uninterruptible functioning of the drive and full system performance during a fault situation as well as optimal power quality.