Direct Flux Vector Control of Synchronous Motor Drives: A Small-Signal Model for Optimal Reference Generation

Varatharajan, Anantaram; Pellegrino, Gianmario; Armando, Eric

doi:10.1109/tpel.2021.3067694

Cited by 17 publications

(15 citation statements)

References 24 publications

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“…where L s0 = L s (δ 0 ) and ψ a0 = ψ s0 + JL s0 Ji s0 . It is to be noted that c v = 0 corresponds to the MTPV condition [15]. 2 Accordingly, c v > 0 holds in the whole feasible operating region.…”

Section: A State-feedback Controlmentioning

confidence: 99%

Stable and Passive Observer-Based V/Hz Control for Synchronous Motors

Tiitinen

Hinkkanen

Kukkola

et al. 2022

2022 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper proposes an observer-based volts-perhertz (V/Hz) control method for synchronous motors. The method is applicable to any synchronous motor type, from permanentmagnet (PM) motors to synchronous reluctance motors (SyRMs). The method consists of a state-feedback control law and a state observer, both of which are designed to be inherently sensorless. The gains can be selected using simple closed-form expressions, resulting in a locally stable and passive system in the whole feasible operating range. Unstable regions and heuristic tuning of conventional V/Hz control are thus avoided. Compared to sensorless field-oriented control, neither speed controller nor separate field-weakening method is needed, the full inverter voltage can be utilized, and the sensitivity to parameter errors is reduced. For the majority of industrial drive applications, the dynamic performance of the proposed method is adequate.

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Section: A State-feedback Controlmentioning

confidence: 99%

Stable and Passive Observer-Based V/Hz Control for Synchronous Motors

Tiitinen

Hinkkanen

Kukkola

et al. 2022

2022 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…A different option, although less usual, is to implement a control scheme where the flux is directly controlled, instead of being indirectly regulated by the current as in fieldoriented control. This happens, e.g., in DTC and direct flux vector control [512,573]. Thanks to the direct regulation of the stator flux, the field-weakening operation can be easily achieved by reducing the flux reference, depending on the dc-link voltage and synchronous speed, without adding extra loops such as the one shown in Figure 31.…”

Section: Field Weakeningmentioning

confidence: 99%

“…Thanks to the direct regulation of the stator flux, the field-weakening operation can be easily achieved by reducing the flux reference, depending on the dc-link voltage and synchronous speed, without adding extra loops such as the one shown in Figure 31. Moreover, since the q 1 -axis current is also directly regulated in direct flux vector control, overcurrent can be straightforwardly prevented as well through the current references, unlike in DTC [512,573]. This kind of approach has been satisfactorily employed for multiphase IMs in [161,173], even under phase OCs (see Part 2).…”

Section: Field Weakeningmentioning

confidence: 99%

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

et al. 2022

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Multiphase drives offer enhanced fault-tolerant capabilities compared with conventional three-phase ones. Their phase redundancy makes them able to continue running in the event of faults (e.g., open/short-circuits) in certain phases. Moreover, their greater number of degrees of freedom permits improving diagnosis and performance, not only under faults affecting individual phases, but also under those affecting the machine/drive as a whole. That is the case of failures in the dc link, resolver/encoder, control unit, cooling system, etc. Accordingly, multiphase drives are becoming remarkable contenders for applications where high reliability is required, such as electric vehicles and standalone/off-shore generation. Actually, the literature on the subject has grown exponentially in recent years. Various review papers have been published, but none of them currently cover the state-of-the-art in a comprehensive and up-to-date fashion. This two-part paper presents an overview concerning fault tolerance in multiphase drives. Hundreds of citations are classified and critically discussed. Although the emphasis is put on fault tolerance, fault detection/diagnosis is also considered to some extent, because of its importance in fault-tolerant drives. The most important recent advances, emerging trends and open challenges are also identified. Part 1 provides a comprehensive survey considering numerous kinds of faults, whereas Part 2 is focused on phase/switch open-circuit failures.

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“…Instead of directly controlling both stator flux and torque, as in DTC, the variables that are directly regulated by this DFC method are the stator flux and the current component that is orthogonal to it in the α 1 -β 1 plane (q 1 axis). On the one hand, the direct flux regulation permits straightforward adaptation to voltage limits (e.g., due to reduced dc-link voltage v dc ), as for DTC, without additional voltage loops that are often needed for this purpose in RFOC (see Part 1) [299]. On the other hand, the direct control of the q 1 -axis current facilitates the limitation of the stator current when necessary, similarly to RFOC but unlike DTC [299].…”

mentioning

confidence: 99%

“…On the one hand, the direct flux regulation permits straightforward adaptation to voltage limits (e.g., due to reduced dc-link voltage v dc ), as for DTC, without additional voltage loops that are often needed for this purpose in RFOC (see Part 1) [299]. On the other hand, the direct control of the q 1 -axis current facilitates the limitation of the stator current when necessary, similarly to RFOC but unlike DTC [299]. DFC is applied to fault-tolerant multiphase drives in [91,92].…”

mentioning

confidence: 99%

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 2: Phase and Switch Open-Circuit Faults

et al. 2022

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Multiphase machines are very convenient for applications that require high reliability. In this two-part survey, the state of the art about fault tolerance in multiphase drives is reviewed. In Part 1, an overview including numerous fault types was presented, along with fundamental notions about multiphase drives. Here, in Part 2, the focus is placed on phase/switch open-circuit (OC) faults in particular, which have received the most attention in the literature. Phase OC failures involve OCs in stator phases or in converter-machine connections, and switch/diode OCs are frequently dealt with similarly or identically. Thanks to the phase redundancy of multiphase drives, their operation can be satisfactorily continued under a certain number of OCs. Nonetheless, the procedure to follow for this purpose is far from unique. For given OC fault conditions, numerous fault-tolerant possibilities can be found in the literature, each of them with different advantages and disadvantages. Moreover, a great variety of methods have also been devised to detect and diagnose phase/switch OC failures so that, as soon as possible, the most appropriate fault-tolerance measures are applied. Thus, given the broad literature about tolerance to phase/switch OC faults in multiphase drives, the survey presented here is expected to be of great interest for the research community and industry.

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Direct Flux Vector Control of Synchronous Motor Drives: A Small-Signal Model for Optimal Reference Generation

Cited by 17 publications

References 24 publications

Stable and Passive Observer-Based V/Hz Control for Synchronous Motors

Stable and Passive Observer-Based V/Hz Control for Synchronous Motors

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 2: Phase and Switch Open-Circuit Faults

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