SAMPLE ETAP MODEL FOR BESS PLANT AND CONNECTION TO UPSTREAM 52KV UPSTREAM NETWORK

AC LOAD FLOW

AC Load Flow for Sample BESS Plant & CONNECTION to 52kV Grid (1 of 3)
(2 of 3)
(3 of 3)

DC LOAD FLOW

DC Load Flow for Sample BESS Plant & CONNECTION to 52kV Grid (1 of 3)
DC Load Flow for Sample BESS Plant & CONNECTION to 52kV Grid (2 of 3)
(3 of 3)

Charging and Discharging Scenarios in Battery Energy Storage Systems (BESS) Project

Please look at 9 different scenarios I have listed in the following pictures and share your ideas.

BESS plant has been connected to an upstream 150kV national grid that is already energized by wind turbines (Wind Park). Batteries could be charged by upstream grid or discharged to upstream grid.

Scenario-1 (BAT=OUT, Wind turbine =100%)
Scenario-2 (BAT=OUT, Wind turbine = 50%)
Scenario-3 (BAT=OUT, Wind turbine =10%)
Scenario-4 (BAT=CHARGE, Wind turbine =100%)
Scenario-5 (BAT=CHARGE, Wind turbine =50%)
Scenario-6 (BAT=CHARGE, Wind turbine =10%)
Scenario-7 (BAT=DISCHARGE, Wind turbine =100%)
Scenario-8 (BAT=DISCHARGE, Wind turbine = 50%)
Scenario-9 (BAT=DISCHARGE, Wind turbine = 10%)

TYPICAL ROUTIN TESTS FOR HV XLPE OR EPR CABLES

  • Conductor examination : Number of wires / Diameter (in mm) maximum & minimum of measured values and requirements
    • Conductor screen thickness measurement (in mm),  maximum & minimum measured values and requirements
  • Insulation Resistance(IR) in Mega Ohm (or MW/average) ,
  • Wall thickness depends on rated voltage (U0) and insulation type according to IEC60502-2 (in mm) maximum & minimum measured values and requirements
  • Insulation screen (in mm): wall thickness (in mm) maximum & minimum measured values and requirements and diameter
  • Metal screen maximum & minimum measured values in mm and cross section in mm2.
    • Hot set test defined in IEC 60811-507
    • It is a mechanical-thermal test for polymetric insulation or sheath materials like XLPE, EPR, or PVC.
    • A test piece of insulation (usually a strip) is cut.
      • A specified load (0.2MPa for insulation, 0.15MPa for sheath) is applied.
      • The sample is placed in an oven at 200°C (for XLPE) or specified temperature.
      • The elongation and permanent deformation (set) after cooling are measured.
      • The maximum elongation under load is measured.
    • Pass criteria (typical for XLPE insulation):
    • Elongation under load <= 175%
    • Permanent elongation after cooling <= 15%

High voltage test laboratory
  • High voltage test – IEC 60840 , Edition 5
  • Partial discharge test (IEC/VDE) [kV]
  • Voltage test (IEC/VDE) : Kv / 30min
  • Electrical test on oversheath-DC test : kV / 1min
  • Measurement of conductor Resistance (Ohm/km , 20°C)
  • Measurement of screen Resistance (Ohm/km , 20°C)
    • Measurement of Capacitance (‌mF/km)

AC voltage controller

Single Line Diagram(SLD)

single Line Diagram of an electrical installation represents the main electrical equipment in the system, including:

  • Power and distribution transformers (including nameplate data) –
  • Generator units (including nameplate data)
  • Motorized loads (including nameplate data)
  • Unmotorized (Static) loads (including nameplate data if available)
  • Capacitive / inductive loads (including nameplate data -)
  • Cables (Power cables)
  • Electrical panel (panel board) equipment:
  • Circuit breakers (including nameplate data)
  • Earthing switches (including nameplate data)
  • Protection and metering devices (including ANSI and meteing codes)
  • Electrical and mechanical interlock
  • Electrical symbols and legends
  • Useful and important notes
  • Maximum 3-phase short circuit and duration (kA/sec or MVAsc), rated current of the panel board

Sample Single Line Diagram