电力电子技术第5版教学课件作者王兆安刘进军Chapter10课件幻灯片.pptVIP

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 transmission (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 capacitor (TSC) I U 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. u s i C u C C VT 1 VT 2 u VT 1 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 slower (maximum delay is one line-cycle). Thyristor-controlled reactor (TCR) To control the effective current flowing through the reactor by controlling delay angle, therefore control the reactive power absorbed by the reactor. u a i a u b u c n b a c Static var generator (SVG) Also called static compensator (STATCOM) CSC based SVG VSC based SVG Operation principle of SVG Harmonic suppression Circuit configuration of an Active power factor (APF) Two solutions Power factor correction Harmonic compensation Operation principle of APF Power quality control Power quality problems Power quality controllers Current harmonics APF Reactive power SVC or SVG Voltage sag Dynamic voltage restorer (DVR) Voltage flicker Universal power quality controller (UPQC) Flexible AC Transmission System (FACTS) FACTS is actually a general term of application if power electronic to the utility electric power transmission system - for higher controllability and larger transmission capacity. Typical FACTA