song2208 commented 3 years ago

Hello~~~

I'm try to run the powerflow of 9 bus system in Pandapower, so The first step is create the 9 bus system in pandapower. After that I'm going to run powerflow ,but I did't complete about it.

I use the diagnostic Tool for check an error ,so I have three noticfication of errors like these.

PANDAPOWER DIAGNOSTIC TOOL

Checking for overload...

Overload check failed: Power flow still does not converge with load and generation scaled down to 0.1 percent

Checking switch configuration...

Power flow still does not converge with all switches closed.

numba_comparison failed due to the following error: Power Flow nr did not converge after 10 iterations!

END OF PANDAPOWER DIAGNOSTIC {'overload': {'generation': False, 'load': False}, 'wrong_switch_configuration': False}

##############################################################################

This is my code to create 9 bus system in pandapower.

import pandapower as pp import numpy as np

create empty net

net = pp.create_empty_network()

create buses

bus0 = pp.create_bus(net, vn_kv=16.5, max_vm_pu=1.05, min_vm_pu=0.95) bus1 = pp.create_bus(net, vn_kv=18, max_vm_pu=1.05, min_vm_pu=0.95) bus2 = pp.create_bus(net, vn_kv=13.8, max_vm_pu=1.05, min_vm_pu=0.95) bus3 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95) bus4 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95) bus5 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95) bus6 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95) bus7 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95) bus8 = pp.create_bus(net, vn_kv=220, max_vm_pu=1.05, min_vm_pu=0.95)

create tranfo

tr1 = pp.create_transformer_from_parameters(net, bus3, bus0, 250, 220, 16.5, 14.4, 3, 0, 0 ) tr2 = pp.create_transformer_from_parameters(net, bus6, bus1, 200, 220, 18, 12.5, 3, 0, 0 ) tr3 = pp.create_transformer_from_parameters(net, bus8, bus2, 150, 220, 13.8, 8.79, 3, 0, 0 )

create lines

l1 = pp.create_line(net, bus4, bus3, 20, "490-AL1/64-ST1A 220.0") l2 = pp.create_line(net, bus6, bus4, 20, "490-AL1/64-ST1A 220.0") l3 = pp.create_line(net, bus6, bus7, 20, "490-AL1/64-ST1A 220.0") l4 = pp.create_line(net, bus7, bus8, 20, "490-AL1/64-ST1A 220.0") l5 = pp.create_line(net, bus8, bus5, 20, "490-AL1/64-ST1A 220.0") l6 = pp.create_line(net, bus5, bus3, 20, "490-AL1/64-ST1A 220.0")

create gen

g0 = pp.create_gen(net, bus0, p_mw=247.5, min_p_mw=0, max_p_mw=450, vm_pu=1, slack=True, controllable=True) g1 = pp.create_gen(net, bus1, p_mw=163.2, min_p_mw=0, max_p_mw=450, vm_pu=1, slack=True, controllable=True) g2 = pp.create_gen(net, bus2, p_mw=163.2, min_p_mw=0, max_p_mw=450, vm_pu=1, slack=True, controllable=True)

create loads

pp.create_load(net, bus4, p_mw=93.2, q_mvar=57.8, controllable=False) pp.create_load(net, bus5, p_mw=66.6, q_mvar=41.3, controllable=False) pp.create_load(net, bus7, p_mw=55.3, q_mvar=34.3, controllable=False)

net #########################################################################

Could you tell me, What should I doing next or checking some things in my system. Thanks you in advance!

wangzhenassd commented 3 years ago

Hi, I think you can not set all the generators as slack (voltage reference), you can try set only the first gen as slack.

rbolgaryn commented 3 years ago

Hi @song2208 ,

please check your transformer parameters. In your example, vk_percent is 3 and vkr_percent is 8,79-14,40. I think this is not plausible. Maybe you used one for the other?

Roman