A concept of induction squirrel cage generator application in ship electric network

Kozak, Maciej; Zawirski, Krzysztof

doi:10.1109/isie.2011.5984073

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Mainly, the differences arise not from control techniques themselves, but from the precision of on-line parameters estimation. In the [21], the sensorless FOC control of an asynchronous generator was presented, and as it turns out, after following a comparison of the experimental results of both studies, the advantage of refined multiscalar control method over the FOC with a simplified machine state observer is clearly visible in dynamic transient states however, in steady state operation, the extensive control methods are only marginally superior. As it was observed at the laboratory test bench, the dealing with electromagnetic interferences is far more important for correct and efficient operation.…”

Section: Discussionmentioning

confidence: 99%

Alternating Current Electric Generator Machine Inverters in a Parallel Power Sharing Connection

Kozak

2019

IEEE Access

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This paper covers the theoretical background as well as chosen selected experimental results obtained for two AC current generators connected to voltage source inverters working in parallel. Inverters were connected in parallel via their intermediate direct current circuits by means of auctioneering diodes which select higher voltage source, and then directly to a DC power network. The selected real-time control algorithm for a digital signal processor and a field programmable gate array was used to achieve the proper excitation of two different types of alternators: a squirrel-cage generator denoted as and a self-excited synchronous generator. Another task for the excitation system was to maintain the proper level of direct current link voltage and stable power distribution between both generators rotating at changing speeds. The windings of alternators were fed with the use of so-called machine side inverters. The asynchronous generator was a voltage source inverter driven with the use of a sensorless multiscalar algorithm based on the current machine model, whereas the self-excited synchronous generator worked on the field oriented control principle. To prove the robustness of the chosen algorithm, different types of load were applied while during the parallel work of the generators and inverters.

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Section: Discussionmentioning

confidence: 99%

Alternating Current Electric Generator Machine Inverters in a Parallel Power Sharing Connection

Kozak

2019

IEEE Access

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“…Because of that and new environmental-pollution demands, a lot of effort is being done to ensure the most effective use of existing solutions. These include different types of power-plant topologies and electrical grids with solutions incorporating direct-current distribution systems based on efficient network technologies, namely the microgrids used both on vessels and inland [1][2][3]. Researchers are becoming increasingly interested in industrial installations and electro-mobile systems.…”

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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“…Because of that and accordingly to new environmental pollution demands a lot of effort is being done in to make the most effective use of existing solutions. These include different types of power plants topologies and electrical grids with solutions incorporating direct current distribution systems with based on efficient network technologies namely the microgrids used both on vessels and in inland [1,2,3]. Researchers are becoming increasingly interested in industrial installations and electro-mobile systems.…”

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

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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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A concept of induction squirrel cage generator application in ship electric network

Cited by 6 publications

References 6 publications

Alternating Current Electric Generator Machine Inverters in a Parallel Power Sharing Connection

Alternating Current Electric Generator Machine Inverters in a Parallel Power Sharing Connection

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

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