Kerber networks

The kerber networks are based on the grids used in the dissertation “Aufnahmefähigkeit von Niederspannungsverteilnetzen für die Einspeisung aus Photvoltaikanlagen” (Capacity of low voltage distribution networks with increased feed-in of photovoltaic power) by Georg Kerber. The following introduction shows the basic idea behind his network concepts and demonstrate how you can use them in pandapower.

“The increasing amount of new distributed power plants demands a reconsideration of conventional planning strategies in all classes and voltage levels of the electrical power networks. To get reliable results on loadability of low voltage networks statistically firm network models are required. A strategy for the classification of low voltage networks, exemplary results and a method for the generation of reference networks are shown.” (source: http:/mediatum.ub.tum.de/doc/681082/681082.pdf)

Average Kerber networks

Kerber Landnetze:

  • Low number of loads per transformer station
  • High proportion of agriculture and industry
  • Typical network topologies: line

Kerber Dorfnetz:

  • Higher number of loads per transformer station (compared to Kerber Landnetze)
  • Lower proportion of agriculture and industry
  • Typical network topologies: line, open ring

Kerber Vorstadtnetze:

  • Highest number of loads per transformer station (compared to Kerber Landnetze/Dorfnetz)
  • no agriculture and industry
  • high building density
  • Typical network topologies: open ring, meshed networks
  Lines Total Length Loads Installed Power
Kerber Landnetze        
Freileitung 1 13 0.273 km 13 104 kW
Freileitung 2 8 0.390 km 8 64 kW
Kabel 1 16 1.046 km 8 64 kW
Kabel 2 28 1.343 km 14 112 kW
         
Kerber Dorfnetz 114 3.412 km 57 342 kW
         
Kerber Vorstadtnetze        
Kabel 1 292 4.476 km 146 292 kW
Kabel 2 288 4.689 km 144 288 kW

You can include the kerber networks by simply using:

import pandapower.networks as pn

net1 = pn.create_kerber_net()

Kerber Landnetze

import pandapower.networks as pn

net1 = pn.create_kerber_landnetz_freileitung_1()

'''
This pandapower network includes the following parameter tables:
  - load (13 elements) p_load_in_kw=8,  q_load_in_kw=0
  - bus (15 elements)
  - line (13 elements) std_type="Al 120", l_lines_in_km=0.021
  - trafo (1 elements)  std_type="0.125 MVA 10/0.4 kV Dyn5 ASEA"
  - ext_grid (1 elements)
'''

net2 = pn.create_kerber_landnetz_freileitung_2()

'''
This pandapower network includes the following parameter tables:
  - load (8 elements) p_load_in_kw=8,  q_load_in_kw=0
  - bus (10 elements)
  - line (8 elements)  std_type="AL 50", l_lines_1_in_km=0.038, l_lines_2_in_km=0.081
  - trafo (1 elements)  std_type="0.125 MVA 10/0.4 kV Dyn5 ASEA"
  - ext_grid (1 elements)
'''
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import pandapower.networks as pn

net1 = pn.create_kerber_landnetz_kabel_1()

'''
This pandapower network includes the following parameter tables:
  - load (8 elements)  p_load_in_kw=8,  q_load_in_kw=0
  - bus (18 elements)
  - line (16 elements)  std_type="NAYY 150", std_type_branchout_line="NAYY 50"
  - trafo (1 elements)  std_type = "0.125 MVA 10/0.4 kV Dyn5 ASEA"
  - ext_grid (1 elements)
'''

net2 = pn.create_kerber_landnetz_kabel_2()

'''
This pandapower network includes the following parameter tables:
 - load (14 elements)  p_load_in_kw=8,  q_load_in_kw=0
 - bus (30 elements)
 - line (28 elements)  std_type="NAYY 150", std_type_branchout_line="NAYY 50"
 - trafo (1 elements)  std_type="0.125 MVA 10/0.4 kV Dyn5 ASEA"
 - ext_grid (1 elements)
'''
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Kerber Dorfnetz

import pandapower.networks as pn

net = pn.create_kerber_dorfnetz()

'''
This pandapower network includes the following parameter tables:
  - load (57 elements) p_load_in_kw=6,  q_load_in_kw=0
  - bus (116 elements)
  - line (114 elements) std_type="NAYY 150"; std_type_branchout_line="NAYY 50"
  - trafo (1 elements) std_type="0.4 MVA 10/0.4 kV Yyn6 4 ASEA"
  - ext_grid (1 elements)
'''
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Kerber Vorstadtnetze

import pandapower.networks as pn

net1 = pn.create_kerber_vorstadtnetz_kabel_1()

'''
This pandapower network includes the following parameter tables:
  - load (146 elements) p_load_in_kw=2,  q_load_in_kw=0
  - bus (294 elements)
  - line (292 elements) std_type="NAYY 150", std_type_branchout_line_1="NAYY 50", std_type_branchout_line_2="NYY 35"
  - trafo (1 elements) std_type="0.63 MVA 20/0.4 kV Yyn6 wnr ASEA"
  - ext_grid (1 elements)
'''
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import pandapower.networks as pn

net2 = pn.create_kerber_vorstadtnetz_kabel_2()

'''
This pandapower network includes the following parameter tables:
  - load (144 elements) p_load_in_kw=2,  q_load_in_kw=0
  - bus (290 elements)
  - line (288 elements) std_type="NAYY 150", std_type_branchout_line_1="NAYY 50", std_type_branchout_line_2="NYY 35"
  - trafo (1 elements) "std_type=0.63 MVA 20/0.4 kV Yyn6 wnr ASEA"
  - ext_grid (1 elements)
'''
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Extreme Kerber networks

The typical kerber networks represent the most common low-voltage distribution grids. To produce statements of universal validity or check limit value, a significant part of all existing grids have to be involved. The following grids obtain special builds of parameters (very high line length, great number of branches or high loaded transformers). These parameters results in high loaded lines and low voltage magnitudes within the extreme network. By including the extreme networks, kerber reached the 95% confidence interval.

Therefore 95% of all parameter results in an considered distribution grid are equal or better compared to the outcomes from kerber extreme networks. Besides testing for extreme parameters you are able to check for functional capability of reactive power control. Since more rare network combination exist, the total number of extreme grids is higher than the amount of typical kerber networks.

  Lines Total Length Loads Installed Power
Kerber Landnetze        
Freileitung 1 26 0.312 km 26 208 kW
Freileitung 2 27 0.348 km 27 216 kW
Kabel 1 52 1.339 km 26 208 kW
Kabel 2 54 1.435 km 27 216 kW
         
Kerber Dorfnetze        
Kabel 1 116 3.088 km 58 348 kW
Kabel 2 234 6.094 km 117 702 kW
         
Vorstadtnetze        
Kabel_a Type 1 290 3.296 km 145 290 kW
Kabel_b Type 1 290 4.019 km 145 290 kW
Kabel_c Type 2 382 5.256 km 191 382 kW
Kabel_d Type 2 384 5.329 km 192 384 kW

The Kerber extreme networks are categorized into two groups:

Type I: Kerber networks with extreme lines

Type II: Kerber networks with extreme lines and high loaded transformer

Note

Note that all Kerber exteme networks (no matter what type / territory) consist of various branches, linetypes or line length.

Extreme Kerber Landnetze

import pandapower.networks as pn

'''Extrem Landnetz Freileitung Typ I'''
net = pn.kb_extrem_landnetz_freileitung()


'''Extrem Landnetz Kabel Typ I'''
net = pn.kb_extrem_landnetz_kabel()
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import pandapower.networks as pn

'''Extrem Landnetz Freileitung Typ II'''
net = pn.kb_extrem_landnetz_freileitung_trafo()


'''Extrem Landnetz Kabel Typ II'''
net = pn.kb_extrem_landnetz_kabel_trafo()
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Extreme Kerber Dorfnetze

import pandapower.networks as pn

'''Extrem Dorfnetz Kabel Typ I'''
net = pn.kb_extrem_dorfnetz()
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import pandapower.networks as pn

'''Extrem Dorfnetz Kabel Typ II'''
net = pn.kb_extrem_dorfnetz_trafo()
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Extreme Kerber Vorstadtnetze

import pandapower.networks as pn

'''Extrem Vorstadtnetz Kabel_a Typ I'''
net = pn.kb_extrem_vorstadtnetz_1()
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import pandapower.networks as pn

'''Extrem Vorstadtnetz Kabel_b Typ I'''
net = pn.kb_extrem_vorstadtnetz_2()
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import pandapower.networks as pn

'''Extrem Vorstadtnetz Kabel_c Typ II'''
net = pn.kb_extrem_vorstadtnetz_trafo_1()
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import pandapower.networks as pn

'''Extrem Vorstadtnetz Kabel_d Typ II'''
net = pn.kb_extrem_vorstadtnetz_trafo_2()
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