Multi-Pulse Voltage Source Converters for HVDC Systems

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Presentation transcript:

Multi-Pulse Voltage Source Converters for HVDC Systems By Prof. Bhim Singh Electrical Engineering Department IIT Delhi, New Delhi

18 Pulse GTO based VSC

18 Pulse GTO based VSC

18 Pulse GTO based VSC

18 Pulse GTO based VSC

18 Pulse GTO based VS Control

18 Pulse GTO based VSC Control

18 Pulse GTO based VSC Control

Back to Back Converter Inverter 21-Level BTB Converter

Back to Back Converter Inverter Specifications

Back to Back Converter Inverter Transformer Connections

Back to Back Converter Inverter Line to Line voltage waveform of one octa-series converter

Back to Back Converter Inverter Control

Back to Back Converter Inverter

Back to Back Converter Inverter

36 pulse self commutated converter Reinjection Technique

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

36 pulse self commutated converter

Five level reinjection scheme

Five level reinjection scheme

Three Phase Multilevel VSC Three-Phase Three Level Diode Clamped Bidirectional Converter.

Three Phase Multilevel VSC Three-Phase Unidirectional Five Level Converter.

Three Phase Multilevel VSC Three-Phase Five Level Flying Capacitor Bidirectional Converter.

Numerical Problem 1 A three-phase bi-directional boost PFC converter draws 10kW from 250V per phase, 50Hz mains for a resistive load. The switching frequency is 20 kHz and ac inductor is 2.5mH. The power-factor is corrected close to unity and PWM modulation index is 0.8. Determine an output dc voltage, value of resistance of load and phase shift in fundamental component of PWM voltage and supply voltage.

Numerical Problem 2 A three-phase voltage source converter feeds a power of 25 kW to 415V(L-L) rms, 50Hz, three-phase ac mains from 720V DC bus. The switching frequency is 10 kHz and ac inductor is 2.50mH. The power-factor is corrected close to unity. Determine PWM modulation index, rms ac current and phase shift in fundamental component of PWM voltage and supply voltage.

Numerical Problem 3 A three-phase twelve-pulse bi-directional boost AC-DC converter (GTO based Voltage Source Converter) draws 10 kW from 254V per phase, 50Hz, 3-phase ac mains with and sinusoidal wave voltage. The ac inductor is 15 mH. The displacement factor is corrected close to unity. The VSC is operated in a mode to cancel 5th and 7th harmonics in VSC output voltage. Determine (i) an output dc voltage, (ii) value phase shift in fundamental component of VSC ac voltage and supply voltage (iii) fundamental phase current, (iv) 11th harmonic current, (v) THD in VSC ac voltage and (vi) THD in ac current.