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1、,Power Electronics,Chapter 10 Application of Power Electronics,Application of Power Electronics,10.1 DC motor drivers ( thyristor-DC motor system ) 10.2 Frequency converters and AC drivers 10.3 Uninterruptible Power Supply ( UPS ) 10.4 Switching Power Supply 10.5 Power factor correction (PFC) 10.6 A
2、pplication in utility power system 10.7 Other applications,10.1 DC motor drivers ( Thyristor-DC motor system ),10.1.1 Rectifier mode of operation 10.1.2 Inverter mode of operation 10.1.3 Reversible DC motor drive system (four-quadrant operation),10.1.1 Rectifier mode of operation,Waveforms of 3-phas
3、e half-wave rectifier with DC motor load,(10-1),Waveforms and equations,(for 3-phase half-wave),where,Speed-torque (mechanic) characteristic when load current is continuous,For 3-phase half-wave,(10-2),For 3-phase bridge,(10-3),(10-4),(10-5),For 3-phase half-wave,Speed-torque (mechanic) characterist
4、ic when load current is discontinuous,EMF at no load (taking 3-phase half-wave as example) For a 60 For a 60,For 3-phase half-wave,Speed-torque (mechanic) characteristic when load current is discontinuous,For different a The point of EMF at no load is raised up. The droop rate becomes steer. (softer
5、 than the continuous mode),For 3-phase half-wave (a1 a4 60),10.1.2 Inverter mode of operation,Equations are just the same as in the rectifier mode of operation except that Ud, EM and n become negative. E.g., in 3-phase half-wave Or in another form,(10-3),(10-4),(10-11),(10-12),Speed-torque character
6、istic of a DC motor fed by a thyristor rectifier circuit,),10.1.3 Reversible DC motor drive system (4-quadrant operation),Back-to-back connection of two 3-phase bridge circuits,4-quadrant speed-torque characteristic of Reversible DC motor drive system,10.2 Frequency converters and AC drivers,Composi
7、te converters,Indirect AC to AC converters (AC-DC-AC converters),Indirect DC to DC converters (Isolated DC to DC converters),Composite converter: Combination of two or more converters in cascaded connection,Indirect AC to AC converters (AC-DC-AC converters),Classifications,According to type of the D
8、C links:,According to whether output voltage and frequency is variable:,In narrow sense, frequency converter only refers to VVVF AC-DC-AC converter.,10.2.1 Configurations of AC-DC-AC converters,Configurations with one-direction power flow,Voltage-source type,Current-source type,Configuration with re
9、generative energy dissipating circuit,Braking transistor and braking resistor,Configurations with regenerative power feedback through inversion-mode thyristor rectifier circuit,Voltage-source type,Current-source type,Configurations realizing bi-directional power flow through double-sided PWM convert
10、ers,16,Voltage-source type,Current-source type,10.2.2 Major Applications of AC-DC-AC frequency converters (VVVF converters),Adjustable speed AC motor drives Advantages of AC motors over DC motors Energy saving on AC motors High-performance AC motor drives Control of AC motors driven by AC-DC-AC freq
11、uency converters (VVVF converters) Constant voltage frequency ratio control Slip frequency control Vector control Direct torque control,10.3 Uninterruptible power supplies (UPS),Basic configuration of UPS,Major Applications of CVCF converters,UPS with back-up energy source,UPS with back-up energy so
12、urce and bypass lines,10.4 Switching Power Supply,Linear power supply,Switching power supply,Point of load regulation (POL),Specifically means a particular switching power supply for a large size IC chip, such as a CUP or a memory chip.,Synchronous Buck,Synchronous Boost,A typical application of swi
13、tching power supply,Power system for telecommunication equipment,Control of switching power supply,Voltage mode control Current mode control Peak current mode control Average current mode control,Voltage mode control,Current mode control,Peak current mode control,Average current mode control,10.5 Po
14、wer Factor Correction (PFC),Operation principle of typical PFC circuit Single-phase boost PFC 3-phases single-switch boost PFC Single stage PFC,Single-phase boost PFC,3-phases single-switch boost PFC,Single stage PFC ( ),A typical converter,10.6 Application in utility power system,High voltage DC tr
15、ansmission (HVDC) Reactive power compensation Harmonics suppression Power quality control, FACTS and custom power,High voltage DC transmission (HVDC),Reactive power compensation,Thyristor switched capacitor (TSC) Thyristor controlled reactor (TCR) Static var generator (SVG),Thyristor switched capaci
16、tor (TSC),TSC waveforms when the capacitor is switched in/out,The voltage across the thyristor must be nearly zero when switching in the capacitor, and the current of the thyristor must be zero when switching out the capacitor.,TSC with the electronic switch realized by a thyristor and an anti-parallel diode,The capacitor voltage will be always charged up to the peak of source voltage. The response to switching-out command could be a little slo
