Performance of MHD generators with electrode current control

Demirjian, A.M.; Pian, C. C. P.

doi:10.2514/6.1981-249

Cited by 10 publications

(6 citation statements)

References 1 publication

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“…This improves the part-load performance of diagonal generators as discussed at length in Ref. 5. The component ratings of the current controllers are defined by the voltages they sustain and the currents they regulate.…”

Section: Diagonal Generatorsmentioning

confidence: 98%

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Power Conditioning and Control of Slagging MHD Generators

Demirjian¹,

Quijano²

1982

Journal of Energy

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The operational characteristics of coal-fired open-cycle linear MHD generators are presented. The salient features of the loading and control requirements of Faraday and diagonal generators are analyzed and circuits that meet these requirements are presented. Consolidation and current control circuits are discussed, elaborating on the design considerations for operating them with MHD generators. Such circuits are shown to have relatively low losses, which results in higher than 98-99% efficiencies. Nomenclature DCW = diagonal conducting walls D V = voltage drop in consolidation circuits, V F(N) = installed volt/ampere factor of consolidation circuits for N consolidated electrodes, unitless / = cur rent, A n = number of electrodes shorted by slag TV = number of consolidated electrodes SCR = silicon controlled rectifiers V = voltage, V V F = Faraday voltage, V a = coupling impedance parameter (stiffness parameter), Q rj = efficiency

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Section: Diagonal Generatorsmentioning

confidence: 98%

“…The efficiency due to the current controllers is influenced by the AF loss losses of Fig. 16 and are The efficiency of the consolidation circuits therefore is (5) which is of the order of 92% for the Mk VI generator, obviously higher with larger generators of higher V F .…”

Section: Electrical Configuration Of Mhd Generators Using Consolidatimentioning

confidence: 99%

Power Conditioning and Control of Slagging MHD Generators

Demirjian¹,

Quijano²

1982

Journal of Energy

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“…In Ref. 8, it was shown that these current controllers can be connected in a particular way to provide a novel loading scheme for the diagonally connected generator. An MHD generator loaded in such a manner has the advantages of both the Faraday and diagonal configurations, i.e., better part-load performances along with reduced control and power conditioning requirements.…”

Section: Single-load Diagonal Generator With Power Shuffle Circuitsmentioning

confidence: 99%

“…However, the cumulative ratings of the control, power conditioning, and load-tap consolidation equipment can still be 50% less than the consolidation requirements of a comparable Faraday generator. 8 Since the costs of these equipment depend on their power ratings, considerable savings can be expected over the Faraday configuration. Obviously, DCW generators cannot sustain a voltage difference between anodes and cathodes that are joined by the diagonal frames and hence, are not amenable to this type of current control scheme.…”

Section: Introductionmentioning

confidence: 99%

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Loading Schemes for a 50 MWth Diagonally Connected MHD Generator

Plan

Demirjian

1982

Journal of Energy

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The characteristics of diagonally connected subsonic MHD generators operating with and without current control/power shuffle circuits are investigated. The results of the analysis are presented for the 50 MW th CDIF 1B2 generator. It is shown that an axial current flows in the uncontrolled diagonal generator which decreases the generator's performance. Electrode current control circuits can be used as power shufflers to eliminate the axial current and to improve the efficiency. The improved performance efficiency can be maintained to part-load conditions when the inverter, channel, and combustor controls are integrated. Control requirements for generators with midchannel power taps are also discussed.

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