Medium-Voltage Drives: Challenges and existing technology

Abu‐Rub, Haitham; Bayhan, Sertaç; Moinoddin, Shaikh; Malinowski, Mariusz; Guziński, Jarosław

doi:10.1109/mpel.2016.2551802

Cited by 105 publications

(39 citation statements)

References 51 publications

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“…Another challenge to the series‐connected IGBTs is the requirement for the independent power supply for each IGBT driver to be at different electric potentials . Isolated power supply to the gate driver has been proposed to meet the requirement of special work mode of a floating power supply . Nevertheless, the volume of the cascaded isolation transformer is too large to be integrated with a DAC test system.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber‐triggered solid‐state switch applied in power cables damped AC voltages test system

Jiang

Luo²,

et al. 2017

IEEJ Transactions Elec Engng

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The damped AC voltage (DAC) cable partial discharge test system is an effective approach to diagnose offline cross-linked polyethylene (XLPE) power cables. The high-voltage solid-state switch, as its core component, should meet the requirements of withstanding the high voltage, short conduction time, and low resistance. This paper reports the development of a solidstate switch for 35 kV DAC test system using insulated gate bipolar transistors (IGBTs) connected in series. To improve the synchronization of the trigger signal, a trigger circuit based on optical fiber is designed. In order to solve the unbalanced voltage distribution of multilevel IGBTs in series, an RCD (resistor-capacitor-diode) snubber circuit is designed and utilized. Especially, lithium batteries were used to drive the trigger circuit, thereby avoiding the problem of isolation of power supplies. Besides, the problem of high-voltage insulation was solved by designing a reasonable structure and layout. Test results show that the proposed solid-state switch, with partial discharge inception voltage >62.5 kV, conduction time <320 ns, and conduction resistance <3.31 , meets the special demands of the 35 kV DAC test system. It is demonstrated that the solid-state switch based on optical-fiber-triggered IGBTs in series can be effectively applied in the DAC test system.

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Section: Introductionmentioning

confidence: 99%

Optical fiber‐triggered solid‐state switch applied in power cables damped AC voltages test system

Jiang

Luo²,

et al. 2017

IEEJ Transactions Elec Engng

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“…The main requirement of AC-DC converters is to provide sinusoidal shape of currents (low THD values) at low transistor switching frequency to achieve high efficiency. One of the solutions to meet those requirements is using multi-level converters [5][6][7]. Three-level NPC converters, due to their relatively low costs, simple structure and uncomplicated DC link voltage balancing methods [8], [9], appear to be the most commonly used [10].…”

Section: Introductionmentioning

confidence: 99%

Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

Falkowski¹,

Kulikowski²,

Grodzki³

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Power electronic three-level AC-DC converters connecting a utility grid with DC supplies are widely used in renewable energy sources. For such distributed systems, the quality of energy is very important. Hence, control algorithms of an AC-DC converter have to provide not only a sinusoidal shape of grid current, but also stable operation during transient states in the grid, e.g. voltage dips or voltage unbalance. This paper deals with the problem of robustness of AC-DC control methods under disturbed grid voltage. Three modern predictive control algorithms are presented and investigated under grid voltage distortions. Experimental results from a laboratory test setup illustrating properties of the described methods are shown. Conventional linear control methods, such as VOC and DPC-SVM, are designed to control only the fundamental component of current. In order to fulfill GCRs and achieve robustness under grid voltage distortion, these linear methods need additional compensation algorithms that, in turn, increase their complexity [16]. There are many publications concerning improvements of the classical control methods in order to ensure proper converter operation under grid voltage distortions [17][18][19]. However, there are only few that relate to non-linear or predictive control methods of AC-DC converters under grid voltage distortion [20,21]. This paper presents three modern non-linear control algorithms. The first one, direct power control three levels three areas (DPC-3L-3A) [13], is an extended version of the look-up table DPC with new optimal error plane distribution as well as with transfer of the error vector into a new coordinate system. Selection of the converter voltage vector is based on the error vector angle, which makes it possible to eliminate the inconvenience of using comparators. The second method presented here, called predictive control of current of three-level converter (PCi-3L) [22], belongs to the group of finite control set model predictive control methods (FCS-MPC). In the PCi-3L strategy the switches are controlled directly without modulation. This is performed by online minimizing of specific cost function J. Depending on the definition cost function, we can control many different variables, e.g. current, dc-link voltage, switching frequency, etc. Cost function is calculated for all converter voltage vectors. Minimum value of J determines the optimal switching combinations.

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“…Business models for condition monitoring evolved from a selective equipment monitoring to plant-wide diagnostics of all the dependent subsystems, i.e., a fleet of machines across the plant. The decision of using a condition monitoring system in the plant is mostly based on the trade-off between the risks associated with equipment failure and number of check points [16]. Recent trends show integration of monitoring functions with process control, leading to the development of suitable platforms, in particular smart sensors and related application software.…”

mentioning

confidence: 99%

Rotating Electrical Machine Condition Monitoring Automation—A Review

et al. 2017

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Abstract:We review existing machine condition monitoring techniques and industrial automation for plant-wide condition monitoring of rotating electrical machines. Cost and complexity of a condition monitoring system increase with the number of measurements, so extensive condition monitoring is currently mainly restricted to the situations where the consequences of poor availability, yield or quality are so severe that they clearly justify the investment in monitoring. There are challenges to obtaining plant-wide monitoring that includes even small machines and non-critical applications. One of the major inhibiting factors is the ratio of condition monitoring cost to equipment cost, which is crucial to the acceptance of using monitoring to guide maintenance for a large fleet of electrical machinery. Ongoing developments in sensing, communication and computation for industrial automation may greatly extend the set of machines for which extensive monitoring is viable.

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Medium-Voltage Drives: Challenges and existing technology

Cited by 105 publications

References 51 publications

Optical fiber‐triggered solid‐state switch applied in power cables damped AC voltages test system

Optical fiber‐triggered solid‐state switch applied in power cables damped AC voltages test system

Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage

Rotating Electrical Machine Condition Monitoring Automation—A Review

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