Voltage Control with Renewable Generation (Per Unit)

Voltage Control Simulator with Renewable Generation (Per Unit System)

Concept: In power systems, we use the "per unit" system for simplifying calculations. Here you can observe how voltage at the substation end (V1) changes as load and renewable generation vary.

Base Values: Power Base = 100 kVA, Voltage Base = 11 kV → Impedance Base = 1210 Ω

Feeder Resistance R (Ω):

Feeder Reactance X (Ω):

Load Active Power PL (kW):

Load Reactive Power QL (kVAR):

RG Active Power PRG (kW):

RG Reactive Power QRG (kVAR):

Voltage at Load End V2 (pu):

Voltage at Load (V2)

Voltage at Substation (V1)

Math explained (Per Unit):

Convert R and X to per unit using Z_base = V²_base / S_base
Convert power values to per unit using S_base = 100 kVA
Voltage drop = (R_pu × (PL - PRG)_pu + X_pu × (QL - QRG)_pu) / V2
V1 = V2 + Voltage Drop

Change RG values to see how voltage improves or worsens based on its support or demand.