Offshore wind turbine park with HVDC Link.

[PowerKylling]

Hi Panda power community.
I have just begun working with Panda power (7 days ago), and really enjoys all the features panda power gives the user, regarding Optimal power flow.

Right now am I trying to make an Offshore wind turbine park with a HVDC Link. Hopefully in time can it look like Tennets 2 GW offshore standard layout. However for now, will I just be happy to get the small 6 bus system, as is shown in the picture attached, to work.

The main issue with the code, is that when the DC line is implemented inside the system, will the static generator(WT) not produce anything and bus 1 to 4 will therefor not be in operation


. This is evident from the picture attached.

Hope some of you can help me out, and maybe explain what is wrong with the code.

Best regards
Jakob

My code is:
`

#%% import
import pandapower as pp
from pandapower.plotting import simple_plot

#%% Bygning af netværk

#create empty net
net = pp.create_empty_network()

#%% byg busser
bus1 = pp.create_bus(net, name="0.69/66kV LV-side Busbar", vn_kv=0.69, type="b")
bus2 = pp.create_bus(net, name="0.69/66kV HV-side Busbar", vn_kv=66, type="b")
bus3 = pp.create_bus(net, name="66/500kV LV-side Busbar", vn_kv=66, type="b")
bus4 = pp.create_bus(net, name="66/500kV HV-side Busbar (PCC)", vn_kv=500, type="b")
bus5 = pp.create_bus(net, name="400/500kV HV-side Busbar", vn_kv=500, type="b")
bus6 = pp.create_bus(net, name="400/500kV lV-side Busbar(POC)", vn_kv=400, type="b")

#%% External Grid
Eg1=pp.create_ext_grid(net, bus6, vm_pu=1.013,va_degree=0)
#print(net.ext_grid)

#%% Transformer
Transformertypes = {"PF - 0.69/33kV transformer": {"sn_mva": 18, "vn_hv_kv": 66, "vn_lv_kv": 0.69, "vk_percent": 6, "vkr_percent": 0.111,"i0_percent":0.24,"pfe_kw": 6, "shift_degree": 150 },
"PF - 19/380kV transformer": {"sn_mva": 255, "vn_hv_kv": 500, "vn_lv_kv": 66.0, "vk_percent": 16, "vkr_percent": 1.22,"i0_percent":0.06,"pfe_kw": 60.0, "shift_degree": 0 },}
pp.create_std_types(net, data=Transformertypes, element="trafo")

tr1 = pp.create_transformer(net, bus2, bus1, name ="0.69/66kV transformer", std_type="PF - 0.69/33kV transformer")
tr2 = pp.create_transformer(net, bus4, bus3, name ="66/500kV transformer", std_type="PF - 19/380kV transformer")
tr3 = pp.create_transformer(net, bus5, bus6, name ="400/500kV transformer", std_type="PF - 19/380kV transformer")

#%% Lines

linetypes = {"0.69kV": {"r_ohm_per_km": 0.6, "x_ohm_per_km": 0.144, "c_nf_per_km": 144, "max_i_ka": 0.588, "type": "cs"},
"66kV 800mm^2 Copper Single Point Bonding": {"r_ohm_per_km": 0.0325, "x_ohm_per_km": 0.052, "c_nf_per_km": 305, "max_i_ka": 1.000, "type": "cs"}}
pp.create_std_types(net, data=linetypes, element="line")

#lines
line1 = pp.create_line(net, bus2, bus3, length_km=1, std_type="66kV 800mm^2 Copper Single Point Bonding", name="66 kV line")

#%%WT
pp.create_sgen(net, bus1, p_mw=200,q_mvar=0, name="static generator")

#%% DC-link
dcl1 = pp.create_dcline(net, name="dc line", from_bus=bus4, to_bus=bus5, p_mw=200, loss_percent=1.0,
loss_mw=0.5, vm_from_pu=1.01, vm_to_pu=1.012, max_p_mw=1000,in_service=True,
min_q_from_mvar=0,max_q_from_mvar=100, min_q_to_mvar=0, max_q_to_mvar=100)

#%% Tegn toplologien

simple_plot(net)

#%%% Beregningerne.

#%% Load flow
pp.runpp(net)

print(net.res_bus)
`

[jkisse]

Hi @PowerKylling, although it is a late reply: The problem in your setup is that there is no reference voltage in the offshore part. If you model the generator as gen with slack=True instead of a sgen, it should work:
pp.create_gen(net, bus1, p_mw=200, slack=True)