Impact of Synchronous Generator Deexcitation Dynamics on the Protection in Marine DC Power Distribution Networks

Kim, Seong‐Il; Kim, Soo-Nam; Dujić, Dražen

doi:10.1109/tte.2020.2977844

Cited by 15 publications

(17 citation statements)

References 13 publications

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“…Випуск № 27 4 характерны для дизель-генераторов [1]. Однако у главных дизелей (ГД) возмущения не могут изменяться ступенчато как по каналу задания частоты вращения, так и по каналу нагрузки.…”

Section: автоматизація суднових технічних засобівunclassified

Optimization of automatic control of the speed of rotation of a marine diesel engine

Горб¹,

Яцык²

2021

ASTF

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Annotation – The well-established method of tuning the speed governors (SG) of diesel engines during their operation under conditions of step disturbances, which are characteristic of diesel-generators, cannot be used for the main marine engines, the dynamic modes of which are associated, first of all, with heavy seas, because disturbances cannot change stepwise both along the channel for setting the rotational speed and along the load channel. In this regard, the practical need for the development of a method for tuning the SG of the main engines, which takes into account the peculiarities of their operation in heavy seas, has been determined. The study simulates the automatic speed control system (ASC) of the main marine engine HYUNDAI – MAN B&W 6G70ME-C9.2 of the large crude carrier "GOLDWAY" with the AutoChief 600 electronic SG. The minimum of instability of the controlled parameter was used as an optimality criterion, i.e. the amplitude of the oscillations of the rotational speed of the diesel engine shaft, with the most probable values of the amplitude and period of oscillations (rolling) of the disturbing effect. The study has established that changing the tuning parameters of the governor may lead to local extrema of the optimality criterion when using an electronic governor in the ACS in the factor space of disturbances on a diesel engine, which are typical for heavy seas. It means that the task, requiring finding local extrema using specialized methods, can be set when using an electronic governor in the ACS. However, a significant decrease in the instability of the rotational speed was achieved by carrying out a simple enumeration of the tuning parameters of the SG. It was also found that with a "heavy" propeller, the rotational speed stability can be increased by decreasing the proportional gain, as well as increasing the integrator time.

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Section: автоматизація суднових технічних засобівunclassified

Optimization of automatic control of the speed of rotation of a marine diesel engine

Горб¹,

Яцык²

2021

ASTF

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“…Therefore, its performance should be verified for different fault conditions. For this purpose, fault currents limited by the generator deexcitation with the fault resistance values of 1 mΩ (assumed as a low-impedance fault condition) and 5 Ω (2.5 times of the power rating of GEN2, as a high-impedance fault condition) are calculated by the equation for the fault current calculation under the deexcitation introduced in [31]:…”

Section: A Protection For Bus Faultsmentioning

confidence: 99%

Protection Coordination for Reliable Marine DC Power Distribution Networks

Kim

Ulissi

Kim³

et al. 2020

IEEE Access

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This paper presents demonstration of a protection scheme integrated into marine DC power distribution networks to investigate the coordination between each protection action. The integrated protection scheme is based on three different time-frame protection actions: fast action -bus separation by a solid-state bus-tie switch, medium action -feeder protection by high-speed fuses, and slow action -power supply protection by generator deexcitation. As the backup protection of the power supply protection, AC fuses are installed between generators and rectifiers. To coordinate each protection action, the influences of the inductance in the bus-tie switch and the DC-link capacitance are investigated by DC short-circuit tests with the different inductance and capacitance values. The protection scheme, coordinated by the above investigation, is verified by system-level short-circuit tests for bus and feeder faults. To validate the protection scheme for various fault conditions, low-and high-impedance fault currents are analytically calculated for the bus faults and simulated for the feeder faults. Time-current curve analyses show that the coordinated protection scheme can effectively protect marine two-bus DC power distribution networks with correct operations of the protection measures and enough time margins between the different actions.

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“…This will allow DC distribution to be employed in vessels with rated powers of several tens of MW. The incentive for the transition from AC to DC PDNs rests mainly on their widely recognised advantages in terms of efficiency, simplicity of operation and ability to integrate means of electrical energy storage [6]- [9]. An essential component in such DC shipboard systems is the solid state bus tie switch (SSBTS) [10]: this device provides two functions that are key to the operation of DC PDNs.…”

Section: Introductionmentioning

confidence: 99%

Solid-State Technology for Shipboard DC Power Distribution Networks

Ulissi

Kim

Dujić

2021

IEEE Trans. Ind. Electron.

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The use of DC shipboard power distribution networks has been shown to offer several advantages over their AC counterparts. The reduction of the size and number of system components, the increased simplicity of operation and fuel efficiency of the system and convenient integration of energy storage systems offer significant economical benefits to the ship operator. Solid-state bus tie switches are widely regarded as being an indispensable component in DC shipboard power distribution networks, for their role as first line of defence against faults. Nevertheless, these devices are not limited exclusively to protection, but can provide additional functionality thanks to their design. This paper shows how a solid-state bus tie switch can be employed for soft-starting an unenergised section of a shipboard power distribution network, eliminating the need for additional components aimed specifically at this task. Two techniques are suggested and their performance is experimentally verified in a laboratory scaled-down model of a DC shipboard network. The additional functionality is achieved exclusively on a control basis, without modification of the switch topology initially intended purely for system protection.

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Impact of Synchronous Generator Deexcitation Dynamics on the Protection in Marine DC Power Distribution Networks

Cited by 15 publications

References 13 publications

Optimization of automatic control of the speed of rotation of a marine diesel engine

Optimization of automatic control of the speed of rotation of a marine diesel engine

Protection Coordination for Reliable Marine DC Power Distribution Networks

Solid-State Technology for Shipboard DC Power Distribution Networks

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