This model implements a static VAR compensator +300/-100 Mvar, thyristors-based (1 TSR - 3 TSC), using SSN.

In the model, a 300-Mvar Static Var Compensator (SVC) regulates voltage on a 6000-MVA 735-kV system. The SVC consists of a 735kV/16-kV 333-MVA coupling transformer, one 109-Mvar thyristor-controlled reactor bank (TCR) and three 94-Mvar thyristor-switched capacitor banks (TSC1 TSC2 TSC3) connected on the secondary side of the transformer. Switching the TSCs in and out allows a discrete variation of the secondary reactive power from zero to 282 Mvar capacitive (at 16 kV) by steps of 94 Mvar, whereas phase control of the TCR allows a continuous variation from zero to 109 Mvar inductive.

Each three-phase bank is connected in delta so that, during normal balanced operation, the zero-sequence triplen harmonics (3rd, 9th... ) remain trapped inside the delta, thus reducing harmonic injection into the power system. The power system is represented by an inductive equivalent (6000 MVA short circuit level) and a 200-MW load. The internal voltage of the equivalent can be varied by means of programmable source in order to observe the SVC dynamic response to changes in system voltage.

The model interpolates the thyristor bank firing for precise var control with regards to firing angle, using the SSN-ITVC algorithm and RT-EVENTS pulse generation. To observe this firing precision, set the 'alpha scan'=1 in the Console and observe the Mvar continuous variation.

This is an updated ADGRID-03 model using SSN. In the model, SSN is used to decouple the switching banks, without delays, as with a normal nodal admittance-based solver.

Open

References

C. Dufour, J. Mahseredjian, J. Bélanger, "A Combined State-Space Nodal Method for the Simulation of Power System Transients", IEEE Transactions on Power Delivery, Vol. 26, no. 2, April 2011 (ISSN 0885-8977), pp. 928-935

NOTE : This demo originates from the Simscape Electrical Specialized Power Systems (SPS) demo power_svc_1tcr3tsc.slx