By K R Padiyar
Rising expertise of VSC-HVDC hyperlinks is defined intimately; provides new advancements similar to program of hybrid lively filters, capacitor commuted converters, double and triple tuned filters etc.; numerous examples and case stories are incorporated to demonstrate concepts.
The software of HVDC know-how has got new impetus with the evacuation of enormous quantum of energy from distant hydro and thermal stations. moreover, the controlability of strength flows within the strength grid has extra a brand new size at the use of HVDC hyperlinks within the context of constructing clever Grids. the ability move from off-shore wind iteration is one other new software. DC transmission at distribution point voltages (using VSC-HVDC) is usually being thought of for integration of disbursed new release within the energy grid. The rising expertise of VSC-HVDC hyperlinks is defined intimately. rather than including new chapters to provide new advancements, the hot fabric is extra on the acceptable locations. The booklet additionally provides different advancements corresponding to the applying of hybrid lively filters, capacitor commutated converters, double and triple tuned filters and so forth. The appendices supply info of thyristor and IGBT valves, temporary simulation of converters and DC strains, synchronous generator modeling, SSR research, CIGRE Benchmark versions and layout of DC and AC voltage controls in VSC-HVDC hyperlinks. numerous examples and case reviews are integrated to demonstrate the innovations.
desk of Contents: DC strength Transmission expertise/ Line Commutated and Voltage resource Converters/ research of HVDC Converters/ Converter and HVDC process keep an eye on/ Converter Faults and security/ Smoothing Reactor and DC Line/ Reactive energy keep an eye on/ Harmonics and Filters/ Multiterminal and Multi-Infeed DC approach/ energy stream research in AC/DC structures/ Modeling and research of AC-DC procedure Interactions/ balance research and gear Modulation/ Appendices & Rights.
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Example text
55) From Eqs. 56) is reduced by both series and shunt compensation. On the other hand, Zn is reduced by series compensation (capacitive) and increased by shunt compensation (inductive). 57) for small values θ . 58) The charging reactive power (QSo ) at no load is given by QSo = −QRo = − θ V2 tan Zn 2 V2θ V 2θ = (1 − ksh ) Zn 2 2Zn From Eqs. 59) 2. AC Transmission Line and Reactive Power Compensation 31 1. The distributed shunt compensation reduces the no load voltage and charging reactive power, but has little effect on the maximum power flow in the line.
1 Analysis of Uncompensated AC Line General A transmission line has distributed circuit parameters. We will be assuming the line to be symmetric in three phases and operating with balanced (positive sequence) voltages and currents. Hence it is adequate to consider only a single phase positive sequence equivalent network of the line (see Fig. 1). In Fig. 1, it is assumed that the sending end is connected to a generator and the receiving end is connected to a (unity power factor) load. The line has series resistance r and inductance l, shunt conductance g and capacitance c (all parameters expressed per unit length).
M. K. Varma, Thyristor-Based FACTS Controller for Electrical Transmission Systems, IEEE Press and Wiley Interscience, New York, 2002. 5. C. F. W. Beaty, Electrical Power Systems Quality, McGraw-Hill, New York, 1996. 6. A. Ghosh and G. Ledwich, Power Quality Enhancement Using Custom Power Devices , Kluwer Academic Publishers, Boston, 2002. 7. G. Hingorani, “Introducing Custom Power”, IEEE Spectrum, v. 32, n. 6, pp. 41–48, 1995. 8. R. M. Kulkarni, “Flexible AC transmission systems: A status review”, S¯adhan¯a, v.