Analysis of three-phase rectifiers with constant-voltage loads

Abstract-This paper describes a high-power brushless interior permanent-magnet (PM) automotive alternator which does not use an inverter. The "inverterless" alternator is designed with a high back electromotive force voltage and high reactance, and acts as a constant current source over much of its wide constant power operating speed range. In this configuration, a switched-mode rectifier can be used to regulate the dc output voltage and current, which avoids the complexity and high cost of an inverter. An analysis of the modeling and performance of interior PM machines in this inverterless topology is described. Experimental results showing an outstanding constant power speed range are presented for a 6-kW concept demonstrator machine tested using a three-phase resistive load to simulate inverterless operation.

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“…Later, Jahns et al [9], [11] performed a detailed study of this effect. They showed that for analysis purposes, the dc voltage source in Fig.…”

Section: Uncontrolled Generationmentioning

confidence: 99%

Inverterless high power interior permanent magnet automotive alternator

Soong¹,

Ertugrul²

38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003.

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“…The thévenin equivalent circuit of three thyristor rectifiers and diode rectifiers have been presented in [27] and [28] respectively. The equivalent circuit presented in [27] provides some scope for improvement during the initial transient period of the DC fault current, whereas [28] presents a representation of the DC side on the input AC side. The paper formally proposes and presents a thévenin equivalent model of the VSC and the three phase anti-parallel diode rectifier for fault studies in DC systems.…”

Section: Introductionmentioning

confidence: 99%

Thévenin Equivalent of Voltage-Source Converters for DC Fault Studies

Bahirat

Høidalen

Mork

2016

IEEE Trans. Power Delivery

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The paper presents a simple modulation index dependent thévenin equivalent circuit model of the voltage source converters (VSC) and the associated anti-parallel diode rectifier (APDR). The model derivation uses orthogonal transformation and a transformer analogy to transfer impedances to the DC side of the converter. The paper proposes a switched equivalent representation of a three phase diode rectifier formed due to the antiparallel diodes when VSC switching is inhibited.The proposed model is implemented in ATP-EMTP and simulation results are compared with switched model. The proposed model is shown to under predict the fault currents for pole-ground (PG) faults and to provide nearly exact match for pole-pole (PP) faults. The rectifier equivalent provides increased accuracy in the transient region with the inclusion of the source inductance. A multiterminal DC (MTDC) system model is used to study effects of aggregation which gives increased accuracy of the equivalent circuit. It is shown that the MTDC system simulation with proposed thévenin equivalent is about 3 times faster than fullswitched circuit simulation for a time step of 5 µs. The MTDC system simulation with the thévenin equivalent circuit is still accurate and 126 times faster when the time step is increased to 750 µs.

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“…2(b)], or simplified even further by treating the rectifier and voltage source as a three-phase resistive load [see Fig. 2(c)], [6]. It is helpful to consider the voltage versus current characteristics (VI loci) of an IPM machine operating with a three-phase resistive load.…”

Section: A Voltage-current Loci Of Ipm Machinesmentioning

confidence: 99%

“…The dc measurements should give a better indication of the output power delivered to the voltage source load during UCG. The calculated dc voltage and current curves were obtained by scaling the calculated ac voltage and current curves by the factors 1.355 for current (theoretical ratio of rectified dc to the rms ac phase current) and 1.283 for voltage [4], [6].…”

Section: Voltage-current and Voltage-power Loci With Rectifier Andmentioning

confidence: 99%

Uncontrolled generation in interior permanent magnet machines

Liaw¹,

Soong²,

Welchko³

et al.

Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting.

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Abstract-The movement toward higher power automotive electrical systems has spurred research into low-cost alternators capable of operating over a wide constant-power speed range. A promising candidate for this application is a specially designed interior permanent-magnet (IPM) machine operating in uncontrolled generation (UCG). This paper investigates the modeling and performance of IPM machines in UCG. The concept of the voltage-current locus is introduced to explain the presence of hysteresis in the machine stator current and this effect is experimentally demonstrated. The effect of nonidealities such as magnetic saturation and stator resistance are also examined, to achieve a more accurate steady-state and dynamic modeling of the machine behavior. The predictions of these models are tested against experimental results.Index Terms-Interior permanent magnet (IPM), uncontrolled generation (UCG), voltage-current loci.

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Analysis of three-phase rectifiers with constant-voltage loads

Cited by 41 publications

References 6 publications

Inverterless high power interior permanent magnet automotive alternator

Inverterless high power interior permanent magnet automotive alternator

Thévenin Equivalent of Voltage-Source Converters for DC Fault Studies

Uncontrolled generation in interior permanent magnet machines

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