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The figure given below shows a three phase selfcommutated voltage source converter connected to a power system. The converter's dc bus capacitor is marked as C in the figure. The circuit is initially operating in steady state with δ = 0 and the capacitor dc voltage is equal to Vdc0. You may neglect all losses and harmonics. What action should be taken to increase the capacitor dc voltage slowly to a new steady state value?
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- Make δ positive and maintain it at a positive value
- Make δ positive and return it to its original value
- Make δ negative and maintain it at a negative value
- Make δ negative and return it to its original value
Correct Option: D
To increase the capacitor dc voltage slowly to a new steady state value, make δ negative and return it to its original valve.
