Improving the Quality of Electric Energy in Ship Power Systems

Romanovskiy, Victor V.; Bezhik, Artem S.

doi:10.21821/2309-5180-2021-13-1-87-101

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The modes of (AEPS) operation when the generator operates in parallel with the network, for example, cogeneration plants [10]. In such operating modes, it is necessary to solve the problem of maintaining the power coefficient optimal for the mode [11]. Moreover, the optimal management of reactive power flows also has a positive effect on the voltage stability in the network, as shown in [12].…”

Section: Introductionmentioning

confidence: 99%

Modeling of an Active Reactive Power Compensator Operation in an Autonomous Electric Power System

Al-suod

2023

IJEETC

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This paper presents the results of a model-based studies on the efficiency of using a static thyristor reactive power compensator in an autonomous electric power system to increase the power factor, which has a positive effect on the autonomous electric power system efficiency. In order to restore the sinusoidal waveform of the network voltage distorted by the interference generated by a static thyristor compensator, the use of combined passive and active filtering during operation was employed. Block diagrams of all the constituent elements of the system, namely a static thyristor compensator, an active filter based on a thyristor converter, and an automatic control system have been developed. A MATLAB model of a reactive power compensator was developed and results of the simulating the model were obtained on the basis of block diagrams. Simulation of the system showed that for a load with a power factor of 0.5–0.6, it is possible to ensure operation with a power factor of 0.8–0.95 with a THD of consumed current in the range of 10%–25%. It has been found that an effective means of eliminating rectified voltage ripple is a cascade connection of an LC filter and an active filter, effectively attenuates harmonics from 4 to 50 by 40 dB. At the same time, a decrease in the cutoff frequency of the active filter leads to an increase in the effective time constant, which has a negative impact on the operating speed of the entire system. To eliminate this shortcoming, the control system is introduced with backward linkages, while precise compensation is carried out by several control loops according to the principle of subordinate control.

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Section: Introductionmentioning

confidence: 99%

Modeling of an Active Reactive Power Compensator Operation in an Autonomous Electric Power System

Al-suod

2023

IJEETC

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Main Directions for the Development of Ship Electrotechnics and Automation

Grigoryev

2022

jour

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In recent decades, the level of electrification and automation of ships has grown significantly. This is due to the increased requirements for technical, operational and technical and economic characteristics on the part of shipowners. The implementation of the requirements has become possible due to the development of related branches of science, engineering and technology: materials science, power converter technology, microprocessor electronics, and information technology. The main directions of development of ship electrical engineering and automation, namely, improvement of power generation and distribution systems, improvement of electric propulsion systems and propulsion systems, improvement of automation systems are considered in the paper. The expediency of using valve generator sets and the transition to electric power distribution on direct current is shown. Static power sources of new generation are actively developing and spreading both in industry and in maritime transport. Good control characteristics, no restrictions on the number of reverses and minimum speed, high efficiency when operating at fractional loads, high torque overload capacity on the propeller significantly expand the scope of modern AC electric propulsion systems. The desire to combine the advantages of different types of propulsion systems has stimulated the creation of combined (hybrid) propulsion systems. Combined installations incorporate a traditional thermal main engine and a propulsion electric motor. The activation of one or another engine is carried out depending on the mode of operation and the speed of the vessel. The introduction of information technologies makes it possible to automate the management and control of maintenance and repair of ship equipment. The modern development of software and hardware and algorithmic support makes it possible to create unmanned ships that can be controlled remotely and move independently (autonomously) according to predetermined algorithms, including algorithms for divergence from other ships at sea. It is concluded that the main tasks within the framework of the directions for development of ship electrical engineering and automation are increasing the energy efficiency of the process for generating electricity by introducing valve generator sets, introduction of innovative sources of electricity with high rates of efficiency and environmental friendliness, including static sources of electricity, the use of rowing electric motors with permanent magnets and inductor type, the use of combined propulsion systems with reversible electric propulsion systems, and increasing the level of automation through the introduction of information technology and artificial intelligence.

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Improving the Quality of Electric Energy in Ship Power Systems

Cited by 2 publications

References 6 publications

Modeling of an Active Reactive Power Compensator Operation in an Autonomous Electric Power System

Modeling of an Active Reactive Power Compensator Operation in an Autonomous Electric Power System

Main Directions for the Development of Ship Electrotechnics and Automation

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