* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

# Download Reinaldo

Electric power system wikipedia, lookup

Current source wikipedia, lookup

Electrical substation wikipedia, lookup

Power factor wikipedia, lookup

Stray voltage wikipedia, lookup

History of electric power transmission wikipedia, lookup

Solar micro-inverter wikipedia, lookup

Resistive opto-isolator wikipedia, lookup

Power engineering wikipedia, lookup

Voltage regulator wikipedia, lookup

Amtrak's 25 Hz traction power system wikipedia, lookup

Voltage optimisation wikipedia, lookup

Power inverter wikipedia, lookup

Mains electricity wikipedia, lookup

Mercury-arc valve wikipedia, lookup

Alternating current wikipedia, lookup

Three-phase electric power wikipedia, lookup

Opto-isolator wikipedia, lookup

Variable-frequency drive wikipedia, lookup

Buck converter wikipedia, lookup

Switched-mode power supply wikipedia, lookup

Curtin & PUCRS Harmonic Characterization Curtin & PUCRS Harmonic Characterization Curtin & PUCRS Curtin & PUCRS Curtin & PUCRS Table of Contents Brazil PUCRS Introduction Objectives Power Quality Harmonic Characterization The Harmonic Mitigation Schemes Curtin & PUCRS The Harmonic Mitigation Schemes Passive Harmonic Trap Filters (HTF) Single-Switch Three-Phase Boost Rectifier Three-Phase Boost type PWM Rectifier (AC-DC converter) Objectives Active Power Filter Curtin & PUCRS Passive Harmonic Trap Filters (HTF) Curtin & PUCRS Harmonic Trap Filters Curtin & PUCRS Using HTF for the 5th and 7th harmonic Curtin & PUCRS Harmonic amplitude in percent of the fundamental component 1.6 1.4 1.2 Using HTF for the 5th and 7th harmonic PMSG output current 1.0 THD = 2.26 % 0.8 0.6 0.4 0.2 0.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Curtin & PUCRS Using HTF for the 5th and 7th harmonic PMSG output voltage Curtin & PUCRS Curtin & PUCRS Single-Switch Three-Phase Boost Rectifier Curtin & PUCRS Single-Switch Three-Phase Boost Rectifier Curtin & PUCRS Three-phase PMSG output currents Curtin & PUCRS Three-phase bridge rectifier input currents Curtin & PUCRS PMSG output current Curtin & PUCRS PMSG output voltage Curtin & PUCRS Three-Phase Boost type PWM Rectifier Curtin & PUCRS Three-Phase Boost type PWM Rectifier Curtin & PUCRS Three-Phase Boost type PWM Rectifier IGBT + Diode current Curtin & PUCRS Three-Phase Boost type PWM Rectifier input currents Curtin & PUCRS Three-Phase Boost type PWM Rectifier line to line voltage Curtin & PUCRS PMSG output current 0.010 Harmonic amplitude in percent of the fundamental component 0.009 0.008 THD = 0.06 % 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0.000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Curtin & PUCRS PMSG output voltage 100.00 Harmonic amplitude in percent of the fundamental component 90.00 80.00 70.00 60.00 50.00 40.00 30.00 THD = 96.25 % 20.00 10.00 0.00 1 101 201 301 401 501 601 701 801 901 1001 1101 1201 1301 1401 1501 1601 1701 1801 1901 Curtin & PUCRS Table of Contents Brazil PUCRS Introduction Objectives Power Quality Harmonic Characterization The Harmonic Mitigation Schemes Power Losses Curtin & PUCRS Power Losses PMSG losses Bridge Rectifier Losses Harmonic Trap Filter Losses Semiconductor Losses Mechanical losses Curtin & PUCRS PMSG losses reference circuit Curtin & PUCRS PMSG losses Curtin & PUCRS PMSG losses Curtin & PUCRS Conclusions • In this work three well-known harmonic mitigation solutions were applied to PMSG WECS AC to DC conversion. They were the HTF, the PFC and the PWM. Harmonic trap filters are easily implemented by passive components but they are normally implemented with bulk components. Curtin & PUCRS Conclusions • Notwithstanding the HTF had presented the good THD results they are not the best solution once they are a matched solution for a specific operation point (wind speed and output power). The losses study also has demonstrated that the PMSG efficiency (η) remains practically constant and the system η is the lowest when the HTF are used. Curtin & PUCRS Conclusions • For these reasons, it is not a recommended way out to obtain harmonic mitigation on PMSG WECS. On the other hand, the single-switch three-phase boost rectifier has presented encouraged results. Such as: low current and voltage THD, simple power topology and control circuit, can work in all wind conditions and presents a real reduction of the PMSG total losses. Curtin & PUCRS Conclusions • Which allow expecting an increasing in the PMSG lifetime without reduction of the power capability. The main drawbacks of this topology are a) the conduction losses in the BR diodes and switch Q1 since the high RMS current value caused by the DCM operation and b) the high output voltage 1 kV. Both problems could be minimized using proper diodes and switch like IGBT. Curtin & PUCRS Conclusions • With the actual technology these problems could be easily solved. The PWM rectifier was studied once if this complex converter is possible to obtain ideal PF and THD. But the losses study has show results very closed to that obtained with the Single Switch Boost Converter. The main advantage is that with this converter is possible to work with output voltages around 600V in spite of 1000V. Curtin & PUCRS THANK YOU • It was a pleasure be here I have enjoy the last six months as the bets in work life. • Special thanks to: Professor Syed Islam and all staff members. • I hope see you again here or in BRAZIL.