By R. Mohan Mathur, Rajiv K. Varma
A major new source for the foreign software marketplace during the last twenty years, static reactive strength compensators have advanced right into a mature know-how and turn into a vital part of contemporary electrical energy structures. they're one of many key units in versatile AC transmission platforms (FACTS). Coordination of static compensators with different controllable proof units gives you not just greatly stronger energy method controllability, but in addition the extension of energy move strength of present transmission corridors to close their thermal capacities, therefore delaying or maybe curbing the necessity to put money into new transmission amenities. providing either an in-depth presentation of theoretical thoughts and sensible purposes bearing on those strength 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 publication offers an immense source for either scholars and engineers operating within the box.
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Additional info for Thyristor-Based FACTS Controllers for Electrical Transmission Systems
A firing angle of 90 results in full thyristor conduction with a continuous sinusoidal current flow in the TCR. As the firing angle is varied from 90 to close to 180 , the current flows in the form of discontinuous pulses symmetrically located in the positive and negative half-cycles, as displayed in Fig. 7. Once the thyristor valves are fired, the cessation of current occurs at its natural zero crossing, a process known as the line commutation. The current reduces to zero for a firing angle of 180 .
If the two thyristors are fired symmetrically in the positive and negative half-cycles, then only odd-order harmonics are produced. The harmonics can be deduced through a Fourier analysis of higher-frequency components. The rms value of the nth-order harmonic is expressed as a function of a in the following equation: I n (a) V 2 qL p V 4 qL p where n [ [ 2k + 1 and k −2 cos a sin(n − 1)a sin(n + 1)a sin na + + n n−1 n+1 sin a cos(na) − n cos a sin(na) n(n2 − 1) 1, 2, 3, . .
5 MW For this line to operate as a symmetrical line, that is, V s have from Eq. 16) It is important to calculate the required additional reactive power to hold the receiving-end voltage to 1 pu (735 kV). 9 lagging. For any load condition, the reactive-power balance at the receiving-end bus shown in Fig. 5 is Qc Qr + Ql , where Qr is the reactive-power flow from the receiving end into the line, Ql is the reactive-power component of the load, and Qc is the reactive power needed from the system to hold V r to the rated value (1 pu).