Page 43 – SVPWM Numerical Problems
Subject: Power Electronics
Topic: Space Vector PWM Numericals
Level: GATE / PSU Very Advanced
🔹 Problem 1 – Maximum Line Voltage
Given:
DC bus voltage = 400 V
Find maximum fundamental line voltage using SVPWM.
For SVPWM:
VLL,max = Vdc
Answer = 400 V
🔹 Problem 2 – Compare with SPWM
Given: Vdc = 400 V
SPWM:
VLL,max = 0.866 Vdc = 0.866 × 400 = 346.4 V
Improvement in SVPWM:
(400 − 346.4)/346.4 × 100 ≈ 15.47%
🔹 Problem 3 – Switching Time Calculation
Given:
Vdc = 600 V
Vref = 300 V
Switching period Ts = 100 μs
α = 20°
T₁ = Ts (Vref/Vdc) sin(60° − α)
T₂ = Ts (Vref/Vdc) sin(α)
Vref/Vdc = 300/600 = 0.5
T₁ = 100 × 0.5 × sin(40°)
= 100 × 0.5 × 0.643
≈ 32.15 μs
T₂ = 100 × 0.5 × sin(20°)
= 100 × 0.5 × 0.342
≈ 17.1 μs
🔹 Problem 4 – Zero Vector Time
T₀ = Ts − (T₁ + T₂)
= 100 − (32.15 + 17.1)
≈ 50.75 μs
🔹 GATE Concept Points
- Always identify sector first
- Use correct sine angles
- T₀ split equally at beginning & end
- Remember 15% voltage gain concept
📌 Quick Revision
SVPWM → 6 sectors
T₁, T₂ from sine relations
T₀ = Ts − (T₁ + T₂)
Power Electronics Advanced Series – Shaktimatha Learning
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