Marine Diesel-generator Model for Voltage and Frequency Variation Analysis During Fault Scenarios

Cuculić, Aleksandar; Ćelić, Jasmin; Prenc, Rene

doi:10.18048/2016.51.01

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…Diesel engine governor model governs the speed of engine. Diesel generator is simulated based on the dynamic equations of the exciter and diesel engine governor model [32].…”

Section: Proposed Methodologymentioning

confidence: 99%

“…This field current controls the magnetic field of rotor to provide the output voltage. Dynamic equations of the dc exciter [32] are described below:

T_{e} \frac{normald E_{fv}}{normald t} = V_{normalp} - K_{normale} E_{fv}

T_{f} \frac{normald R_{d}}{normald t} = - R_{d} + \frac{K_{g}}{T_{f}} E_{fv}

T_{a} \frac{normald V_{p}}{normald t} = - V_{normalp} + K_{c} R_{d} - \frac{K_{c} K_{g}}{T_{normalf}} E_{fv} + K_{c} false(V_{ref} - V false)

where

T_{e}

represents the time constant of exciter,

T_{f}

indicates the stabiliser time constant.

K_{e}

is the gain constant of exciter,

V_{p}

is the output voltage of the pilot exciter of diesel generator.…”

Section: Proposed Methodologymentioning

confidence: 99%

“…As the swing equation is non-linear in nature, it has to be linearised in order to obtain the angular frequency w r of the virtual rotor. From (32), the following expression can be derived to calculate the virtual angular frequency of the rotor:…”

Section: Virtual Synchronous Generatormentioning

confidence: 99%

See 2 more Smart Citations

Frequency support in a micro‐grid using virtual synchronous generator based charging station

Dhingra

Singh

2018

IET Renewable Power Generation

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This study focuses on the role of electric vehicle (EV) charging station (CS) to support the frequency of the islanded micro-grid (MG). Frequency deviation is a common issue in islanded MGs due to the intermittent nature of renewable energy sources (RES). This issue can be minimised by providing the inertia to the system. However, RES have low or no rotational mass and therefore, they are not able to provide the inertia to the system. In this study, the concept of virtual synchronous generator (VSG) mechanism using a CS is proposed to provide the inertia to the system, where a fleet of EVs parked in CS acts as an energy storage system for MG. Simulations have been performed in Matlab Simulink on the data taken from the MG on the island Kythnos in Greece. Case studies have been carried out to verify the frequency support of MG using VSG mechanism. In these case studies, irradiation level of the photovoltaic array and load of the MG system have been changed arbitrarily to induce the power mismatch in the system. Through simulation results, it has been verified that the frequency of the system can be supported by the bidirectional flow of power between the CS and MG using VSG control mechanism.

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“…Diesel engine governor model governs the speed of engine. Diesel generator is simulated based on the dynamic equations of the exciter and diesel engine governor model [32].…”

Section: Proposed Methodologymentioning

confidence: 99%

“…This field current controls the magnetic field of rotor to provide the output voltage. Dynamic equations of the dc exciter [32] are described below:

T_{e} \frac{normald E_{fv}}{normald t} = V_{normalp} - K_{normale} E_{fv}

T_{f} \frac{normald R_{d}}{normald t} = - R_{d} + \frac{K_{g}}{T_{f}} E_{fv}

T_{a} \frac{normald V_{p}}{normald t} = - V_{normalp} + K_{c} R_{d} - \frac{K_{c} K_{g}}{T_{normalf}} E_{fv} + K_{c} false(V_{ref} - V false)

where

T_{e}

represents the time constant of exciter,

T_{f}

indicates the stabiliser time constant.

K_{e}

is the gain constant of exciter,

V_{p}

is the output voltage of the pilot exciter of diesel generator.…”

Section: Proposed Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Frequency support in a micro‐grid using virtual synchronous generator based charging station

Dhingra

Singh

2018

IET Renewable Power Generation

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“…All the parameters of the control systems are reported in Table II. B. Ship-side system model design One of the common arrangements of primary generators on board modern vessels consists in synchronous machines driven by diesel prime movers [26]. The dynamic model of each generating unit is formed by the following components: a synchronous machine, a prime mover, a diesel engine speed governor (GOV), and an excitation system, which includes the automatic voltage regulator (AVR) [27].…”

Section: A Shore-side System Designmentioning

confidence: 99%

High-Voltage Shore Connection Systems: Grounding Resistance Selection and Short-Circuit Currents Evaluation

D’Agostino¹,

Grillo

Infantino

et al. 2022

IEEE Trans. Transp. Electrific.

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Cold ironing represents an effective solution to remove air polluting emissions from ports. The high voltage shore connection system is the key enabling facility that allows to provide power from the shore side electrical system to the ship. The design of the shore connection needs a comprehensive assessment of the fault currents in different operating scenarios. International standards require the neutral point of the shore connection transformer be equipped with a neutral grounding resistor. Its value has to be defined to guarantee safety and protection of equipment and personnel in case of single phaseto-ground faults. Moreover, three-phase short circuits need to be considered to size equipment and protection devices. A crucial role is played by the frequency converter control system, required to adapt the mains frequency to the frequency of the ship. In this work, a complete electro-magnetic dynamic model of the high voltage shore connection has been developed, including frequency converter, shore-side transformer, connection MV cables and power system of the ship, to analyze in detail the behavior of the system in case of single phase-to-ground fault and three-phase short circuit, taking into account relevant standards and best practices.

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“…Various studies have been carried out on marine diesel generators in the literature. Cuculić et al (2016) analyzed the dynamic behavior of the generator set in the event of a failure on ships. They modeled the generator set and examined the sudden collapse of one of the running generators in the simulation environment.…”

Section: Introductionmentioning

confidence: 99%

Examining the Effect of Generator Load Sharing Practices on Greenhouse Gas Emissions for a Ship

Yiğit

2022

Konya Journal of Engineering Sciences

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In this paper, the issue of efficient operation of generators, which is one of the energy efficiency parameters in ship electricity systems, is discussed in terms of greenhouse gas emissions. In order to meet the same power needs on a bulk carrier ship, three different load sharing situations are assessed in which the other generator is run synchronously when the active generators reach 40%, 60%, and 80% load ratios. Thus, CO2, CH4, and N2O emissions from generators for each practice are analyzed depending on fuel consumption. The results show that emissions vary for certain power needs in each situation. Also, there was no change in emissions for some power needs in three situations. In addition, it was estimated that up to 22% emission reductions could be achieved, depending on the power needs of the ship, if the generators were run at an 80% load ratio instead of 40%.

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Marine Diesel-generator Model for Voltage and Frequency Variation Analysis During Fault Scenarios

Cited by 10 publications

References 4 publications

Frequency support in a micro‐grid using virtual synchronous generator based charging station

Frequency support in a micro‐grid using virtual synchronous generator based charging station

High-Voltage Shore Connection Systems: Grounding Resistance Selection and Short-Circuit Currents Evaluation

Examining the Effect of Generator Load Sharing Practices on Greenhouse Gas Emissions for a Ship

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