fixed a logic bug, either _impedance_bb_switches is True or False but not 0.

Author: vogt31337

pandapower/build_branch.py

@@ -1329,6 +1329,8 @@ def _calc_switch_parameter(net, ppc):
                 Numpy array. with the following order:
                 0:bus_a; 1:bus_b; 2:r_pu; 3:x_pu; 4:b_pu
     """
+    if "_impedance_bb_switches" not in net or not (net._impedance_bb_switches).any():
+        return
     rx_ratio = net["_options"]["switch_rx_ratio"]
     rz_ratio = rx_ratio / np.sqrt(1 + rx_ratio ** 2)
     xz_ratio = 1 / np.sqrt(1 + rx_ratio ** 2)

pandapower/build_bus.py

@@ -274,7 +274,7 @@ def create_bus_lookup(net, bus_index, bus_is_idx, numba):
     if switches_with_pos_z_ohm.any():
         net._impedance_bb_switches = closed_bb_switch_mask & switches_with_pos_z_ohm
     else:
-        net._impedance_bb_switches = np.zeros(switches_with_pos_z_ohm.shape)
+        net._impedance_bb_switches = np.zeros(switches_with_pos_z_ohm.shape).astype(bool)
 
     if numba:
         bus_lookup, merged_bus = create_bus_lookup_numba(net, bus_index, bus_is_idx)