Hybrid Propulsion System for Marine Vessels based on a DC Microgrid

Mirzaeva, Galina; Miller, Dmitry; Mirchell, Steve; Steber, Alan

doi:10.1109/ecce50734.2022.9948070

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…To achieve such, the transfer function of the control loops should be defined. After some simplifications on voltage equations (5,6) the transfer functions of current loops for SESG are as follows:…”

Section: Synchronous Generator DC Voltage Cascaded Controlmentioning

confidence: 99%

“…There are some drawbacks arising from direct current technology but still a lot of efforts is being done on preparation of robust systems which have all features required in electrical power grids. The regular island mode power grid (isolated from external sources) system which is dominant on the board of the vessels must meet many requirements e.g., a stable asymmetrical load sharing feature with maintain appropriate voltages levels which has been shown in [4,5]. Another important advantage of such systems is possible use of electricity storage banks consisting of batteries and ultra/supercapacitors.…”

Section: Introduction To Direct Current Grids and Power Sharing Issuesmentioning

confidence: 99%

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Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Kozak,

Słodkowski,

Sawicki

2024

Preprint

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The article presents the issues related to load sharing in direct current grid and a novel control method which has advantages over known solutions. Unlikely of many similar sounding papers this article shows attempt of creation fully controllable non-isolated system which allows load sharing between permanent magnet alternator equipped with machine side converter (MSC) and dual active bridge (DAB) tied to batteries or supercapacitor. The power sharing is essential feature of parallel connected direct current generators and all types of voltage sources in this way are contributing power to the system. Such system should have possibility of the rapid voltage build up in the case of sudden electrical load changes. To keep the optimal efficiency of the alternator the rotational speed changes according to proper mapping of driving combustion engine. When rotational speed is too low then sudden electrical load can cause significant voltage drop and time needed for voltage build up will vary according to RPM increase. In such situations the undervoltage system can trip the breaker and finally there may be a blackout. To avoid such problem the DC systems which consist of batteries and supercapacitor were introduced. System components include a self-excited synchronous generator (SESG) operating at variable shaft speed as well as batteries and supercapacitors that provide electricity for sudden electrical load changes on the distribution grid. The core of presented system is in power distribution method which consists of programmed controllers structure allowing precise currents distribution. A novelty in the proposed method is the use of a cascaded system of current and DC voltage regulators which allows power distribution precise control. In contrary to previously presented solutions, the proposed system allows fast and accurate control of currents loading parallel connected DC voltage sources for wide range generator speed changes. In presented solution both converters have been equipped with Schottky diodes preventing flow of equalizing currents between closed transistors in the parallel mode of operation. An experimental test-stand of the described system is presented with its theoretical basis and experimental results.

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Section: Synchronous Generator DC Voltage Cascaded Controlmentioning

confidence: 99%

Section: Introduction To Direct Current Grids and Power Sharing Issuesmentioning

confidence: 99%

Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Kozak,

Słodkowski,

Sawicki

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…There are some drawbacks arising from direct-current technology but a lot of effort is being done regarding the preparation of robust systems that have all the features required in electrical power grids. The regular island-mode (isolated from external sources) power grid system that is dominant onboard vessels must meet many requirements, e.g., a stable asymmetrical power-load-sharing feature to maintain appropriate voltages levels, which has been shown in [4,5]. Another important advantage of such systems is the possible use of electricity storage banks consisting of batteries and ultra/supercapacitors.…”

Section: Introduction To Direct Current Grids and Load-power-sharing ...mentioning

confidence: 99%

Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Kozak,

Słodkowski,

Sawicki

2024

Electronics

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The article presents the issues related to load-power sharing in direct-current grid and a novel control method has advantages over known solutions. Unlike many similar-sounding papers, this article shows an attempt at creating fully controllable non-isolated system that allows for load-power sharing between a permanent magnet alternator equipped with machine-side converter (MSC) and a dual active bridge (DAB) tied to batteries or supercapacitor. The current-based load-power sharing is an essential feature of parallel-connected direct-current generators, and all types of voltage sources, in this way are contributing power to the system. To keep the optimal efficiency of the alternator, the rotational speed changes rely on proper mapping of the driving combustion engine. System components include a self-excited synchronous generator (SESG), operating at variable shaft speed, as well as batteries and supercapacitors that provide electricity for sudden electrical-load changes on the distribution grid. The core of the presented system is in a power-distribution method that consists of a programmed-controller structure allowing precise current distribution. A novelty of the proposed method is the use of a cascaded system of current and DC voltage regulators that allows for precise power-distribution control. In contrast with previously presented solutions, the proposed system allows for fast and accurate control of currents, loading parallel-connected DC voltage sources for wide-range generator speed changes. In the presented solution, both converters have been equipped with Schottky diodes, preventing the flow of equalizing currents between closed transistors in the parallel mode of operation. An experimental test-stand of the described system is presented with its theoretical basis and experimental results.

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“…In high-power industrial applications that require high operational reliability, unconventional structured electric machines provide an interesting solution. They are used in various electromechanical systems such as electric propulsion in the field of railway traction, aerospace application [1,2], electrical vehicles [3] and marine applications [4].…”

Section: Introductionmentioning

confidence: 99%

Robust Variable Structure Control Approach of Two Series-Connected Five-Phase PMSMs Under Healthy and Faulty Operation Modes

Ajmi,

Krim,

Hosseyni

et al. 2023

IEEE Access

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In this paper a robust vector control method based on second order Super Twisting Sliding Mode Controllers (STSMCs) for two series-connected Five-Phase Permanent Magnet Synchronous Motors (FP-PMSMs) supplied by a single five-leg inverter is suggested. The vector control method of the two seriesconnected FP-PMSMs is based on six regulation loops for currents and speeds that are usually based on proportional integral controllers. Thus, the first aim of this paper is to replace the proportional integral controllers by the proposed second order STSMCs in order to enhance the control system performance in terms of robustness under uncertainties, external disturbances and tracking accuracy. Indeed, the second order STSMCs are proposed in order to overcome the limitations of the proportional integral controllers in terms of sensitivity against the variations in FP-PMSMs parameters and load disturbances and to overcome the first order sliding mode control chattering problem. However, the suggested second order STSMCs require information about the load torques applied to the two FP-PMSMs, which are estimated using sliding mode load torque observers hence reducing the cost and maintenance rate of the electromechanical system due to the elimination of load sensors. Our simulation studies conducted in MATLAB/Simulink check whether the proposed topology of the two series-connected FP-PMSMs controlled by the suggested vector control based on second order STSMCs can regulate the speed at the same time under various conditions. These conditions include load disturbances, parameter variations in both machines, and disturbances resulting from the opening of a phase. Our objective is to demonstrate the excellent robustness of the suggested second order STSMCs based vector control approach in terms of independent speed control of the two FP-PMSMs even at low or reversed speeds, compared with the conventional proportional integral control strategy. In this comparative study, various performance indices are used to demonstrate the robustness of the proposed vector control method based on second order STSMCs control strategy in comparison to the vector control method based on proportional integral controllers.INDEX TERMS Five-phase PMSMs; vector control strategy, second order sliding mode control; supertwisting algorithm, faulty operation modes.

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Hybrid Propulsion System for Marine Vessels based on a DC Microgrid

Cited by 4 publications

References 14 publications

Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Control Method of Load Sharing between AC Machine and Energy Storage Bank in the DC Grid

Robust Variable Structure Control Approach of Two Series-Connected Five-Phase PMSMs Under Healthy and Faulty Operation Modes

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