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Figure 2.13 indicates shunt converter pulse logic with basic control system. The reference voltage and current are compared with desired active and reactive power demand in the circuit. The shunt converter has ability to provide source or sink for system current.

Considering transformer admittance and bus volt age is V∠δ. The power injected using STATCOM can be shown to be [1]:

(2.17)

(2.18)

Where,

k = constant based on type of inverter (for six pulse converter and Vdc∠α is veriable input voltage for transformer.

Figure 2.13 Basic control of shunt compensator logic.