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In a $100$ bus power system, there are $10$ generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the $PV$ buses are converted to $PQ$ type. In this iteration,

  1. The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two.
  2. The number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two.
  3. The number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two.
  4. The number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two.
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