By R. Mohan Mathur, Rajiv K. Varma
Over the last twenty years, static reactive strength compensators have advanced right into a mature expertise and turn into a vital part of contemporary electrical energy structures. they're one of many key units in versatile AC transmission structures (FACTS). Coordination of static compensators with different controllable proof units provides not just drastically more suitable energy process controllability, but in addition the extension of strength move potential of latest transmission corridors to close their thermal capacities, hence delaying or perhaps curbing the necessity to put money into new transmission facilities.
supplying either an in-depth presentation of theoretical ideas and functional purposes bearing on those energy compensators, Thyristor-Based evidence Controllers for electric Transmission platforms fills the necessity for a suitable textual content in this rising know-how. Replete with examples and case reports on keep an eye on layout and function, the ebook offers a huge source for either scholars and engineers operating within the box.
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Extra resources for Thyristor-Based FACTS Controllers and Electrical Transmission Systems
Example text
Large, synchronous condensers are usually hydrogen-cooled. Ratings of up to 345 MVA have been reported in commercial use [12]. Various aspects of the design, operation, and starting methods of synchronous compensators are explained in ref. [3]. 1 condenser. The relation between stator current and field current in the synchronous slow control responses (100–500 ms) because of their large field-time constants. As they are rotating devices, they require regular maintenance and become more expensive than equivalent-rating static compensators.
11) Active and reactive powers of a transmission line are frequently normalized by choosing the surge-impedance load (SIL) as the base. The SIL is defined as P0 V 2nom / Z 0 , where V nom is the rated voltage. 13) Pr P0 and Qs Q0 Qr Q0 Midpoint Conditions of a Symmetrical Line The magnitude of the midpoint voltage depends on the power transfer. This voltage influences the line insulation and therefore needs to be well understood. For a symmetrical line where the end voltages are held at nominal values, the midpoint voltage shows the highest magnitude variation.
Consider a short, symmetrical electrical line as shown in Fig. 13. 13 The series compensation of a short, symmetrical transmission line. 21) From the voltage-phasor equations and the phasor diagram in Fig. 23) Therefore, from Eq. 24) Using Eqs. 23), Eq. 24) may be written as 1 DP d 2 tan 2 ( − DX l I 2l ) As − DX l is the reactance added by series capacitors, DX l I 2l the incremental var rating of the series capacitor. 2 Shunt Compensation Reconsider the short, symmetrical line described in Fig.