Direct digital closed-loop control of h.v. d.c. convertors

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Direct digital closed-loop control of h.v. d.c. convertors

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© The Institution of Electrical Engineers
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As an alternative to present analogue-based control schemes, the basic design characteristics and dynamic performance of a newly proposed direct digital control are described. Tests are carried out in a specially designed scaled-down model provided with the necessary monitoring facilities for direct digital control. Special emphasis is given to the performance of relatively weak a.c. systems, and therefore the model includes suitable representation of the system parameters and of the filters normally used. It is shown that the implementation of equidistant-firing control by means of digital feedback loops provides fast recoveries from convertor and line disturbances.

Inspec keywords: power convertors; closed loop systems; direct digital control

Other keywords: direct digital closed loop control; tests; HVDC convertors; dynamic performance; basic design characteristics

Subjects: Control of electric power systems; Power convertors and power supplies to apparatus

References

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      • J. Arrillaga , G. Galanos . Theoretical basis of a digital method of grid control for HVDC convertors. IEEE Trans. , 2049 - 2055
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      • J. Arrillaga , G. Galanos . Fault-detection scheme for a direct digital control of a.c.-d.c. interconnection. Proc. IEE , 4 , 785 - 793
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      • J.D. Ainsworth . The phase-locked oscillator — a new control system for controlled static convertors. IEEE Trans. , 859 - 865
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      • J. Arrillaga , D.G. Baldwin . Derivation of logical information for the direct digital control of HVDC convenors. IEEE Trans. , 360 - 367
    5. 5)
      • Baldwin, D.G.: `The design of a static a.c./d.c. convertor with grid control and monitoring facilities suitable for direct digital control techniques', January 1970, M.Sc. thesis, UMIST.
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      • A. Ekstrom , G. Liss . A refined HVDC control system. IEEE Trans. , 723 - 732
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