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Classification of unified power quality compensators
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- 2. Classification of UnifiedPower Quality Compensators •Converter-Based Classification of UPQCs • VSC-based unified power quality compensator •CSC-based unified power quality compensator •Topology-Based Classification of UPQCs •Right shunt UPQC as a combination of DSTATCOM & DVR •Left shunt UPQC as a combination of DSTATCOM & DVR •Supply System-Based Classification of UPQCs •Two-Wire UPQCs •Three-Wire UPQCs •Four-Wire UPQCs •Rating-Based Classification of UPQCs •UPQC-Q •UPQC-P •UPQC-S
- 3. Converter-Based Classification ofUPQCs VSC-based unified power quality compensator
- 4. CSC-based unified powerquality compensator
- 5. VSC BASED UPQCCSC BASED UPQC Use of IGBT’s Use of IGBT+series diode GTO(restricted to switching frequency)-bulky,costly,heavy losses Energy storage element- Capacitor Energy storage element- Inductor Multilevel & Multistep modes are possible Multilevel & Multistep modes are not possible Comparison Of VSC and CSC
- 6. Topology-Based Classification ofUPQCs Used for electric utilities to reduce harmonics Used to give clean power to computers and medical equipments Regulates terminal voltage Eliminates negative sequences voltages Regulates terminal voltage Eliminates negative sequence currents Reduced ratings-low cost High cost Simple control Complex control
- 7. Supply System-Based Classificationof UPQCs Two-Wire UPQCs •Ripple filters are used to reduce switching ripples •Both left and right shunt configurations are used •Domestic appliances
- 8. Three-Wire UPQCs •Cf,Rf,Lr,Cr-Ripple filters,Lf-Interfacing Inductors,Tr-Injection T/f •DVR&DSTSTCOM control for improving power quality in PCC voltages and load current •ASDs
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- 10. Rating-Based Classification ofUPQCs UPQC-Q -A DVR is used for series voltage injection in quadrature with supply current with almost zero active power injection (a) Phasor diagram of a UPQC-Q for voltage sag compensation. (b) Phasor diagram of a UPQC-Q for voltage swell compensation.
- 11. UPQC-P -DVR is usedfor series voltage injection in phase with supply current with only an active power injection (c) Phasor diagram of a UPQC-P for voltage sag compensation. (d) Phasor diagram of a UPQC-P for voltage swell compensation.
- 12. UPQC-S -DVR is usedfor series voltage injection at optimum phase angle with minimum kVA rating, S, or any other criterion (e) Phasor diagram of a UPQC-S for voltage sag compensation. (f) Phasor diagram of a UPQC-S for voltage swell compensation