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⚡ Free Tool

Reactive Power Calculator

Slide CF, power factor, voltage, and rated MW. Watch Q, kVA, phasor, and IEEE 1547 compliance update in real time. Download a pre-filled Excel report for your interconnect study.

Assumptions: balanced three-phase, fundamental-frequency only (60 Hz). Q = P · tan(acos(PF)) is exact only for sinusoidal fundamental. Real plant feeders with harmonic distortion or unbalance produce a different total apparent power; use a true-RMS meter or harmonic-aware analysis for compliance studies. For interconnect filings this calculator is a planning tool, not a substitute for a measured PF report.

⚙ Input Parameters
Rated System MW
10.0 MW
0.5255075100 MW
Capacity Factor (CF)
0.26
00.250.500.751.0
Annual average: solar ~0.18–0.28 · Wind ~0.30–0.45
Target Power Factor
0.95 lag
0.700.800.900.951.00
IEEE 1547: must absorb/inject at PF ≥ 0.90 at POI
Line-Line Voltage (kV)
34.5 kV
4 kV12.4734.569138 kV
Inverter Efficiency (L_inv)
0.98
0.900.940.970.99
Soiling Loss (L_soil)
0.95
0.800.880.951.00
📐 Formula Reference
PR Formula
PR = CF / (L_inv × L_soil × L_wire × L_avail) P = MW_rated × CF × L_inv × L_soil S = P / PF Q = √(S² – P²) I_line = S / (√3 × V_LL) φ = arccos(PF) in degrees
IEEE 1547-2018 Requirements at POI
Min absorbing PF (Cat I/II)≥ 0.90 lag
Min injecting PF (Cat III)≥ 0.90 lead
Voltage ride-through Category II0.0–0.88 pu
Reactive priority modeRequired Cat III
Max Q injection at rated P≈ 43.6% rated kVA
Within IEEE 1547 reactive limits · PF = 0.95 lag
IEEE 1547 Cat II
📊 Results
Reactive Power Q
849
kVAR (inductive/absorbing)
Apparent Power S
2,737
kVA
Real Power P
2,600
kW (actual delivered)
Line Current
45.8
A (line-to-line)
PF Angle φ
18.2°
lagging (EEI convention)
Performance Ratio
0.832
PR (inverter × soil losses)
Annual Generation
22.8
GWh / year est.
Q/P Ratio
32.7%
reactive burden on inverter
🔵 Phasor Diagram
📋 Dispatch Schedule (PF Steps)
PF P (kW) Q (kVAR) S (kVA) I (A) Status