Per-Unit Change of Base Function.
Performs a per-unit change of base operation for the given
value constrained by the old base and new base.
\[Z_{pu-new}=Z_{pu-old}*\frac{BASE_{OLD}}{BASE_{NEW}}\]
- Parameters:
- quantity : complex
Current per-unit value in old base.
- puB_old : float
Old per-unit base.
- puB_new : float
New per-unit base.
- Returns:
pu_new – New per-unit value.
- Return type:
complex