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An Overview on Power Quality Improvement using Multilevel Inverter based Dynamic Voltage Restorer

An Overview on Power Quality Improvement using Multilevel Inverter based Dynamic Voltage Restorer. Ms. M. Maheswari. Introduction. Quality : A  measure of excellence or a state of being free from defects, deficiencies and significant variations . Power Quality:

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An Overview on Power Quality Improvement using Multilevel Inverter based Dynamic Voltage Restorer

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  1. An Overview onPower Quality Improvement using Multilevel Inverter based Dynamic Voltage Restorer Ms. M. Maheswari Power Quality Improved using DVR

  2. Introduction • Quality: A measure of excellence or a state of being free from defects, deficiencies and significant variations. • Power Quality: Worthiness of electrical power to consumer devices i.e. not to disturb or damage appliances and devices. Power Quality Improved using DVR

  3. Parameters considered for Power Quality • Voltage Magnitude • Frequency • Wave-shape. Power Quality Improved using DVR

  4. Effects of Power Quality • Power Quality issues cause business problems such as: • Lost productivity, wastage of manpower and equipments • Customer and/or management dissatisfaction • Heavy financial impact • According to Electric Light and Power Magazine, 30% to 40 % of All Business Downtime Is Related to Power Quality issues. Power Quality Improved using DVR

  5. Why Power Quality is Big issue Presently? • Widespread Usage of Sensitive Loads in all Applications (PLC based equipments, Computers and the like) • For certain devices, a momentary disturbance may result in • scrambled data • interrupted communications • a frozen mouse • system crashes and equipment failure Power Quality Improved using DVR

  6. Power Quality = Voltage Quality P=V*I * CosΦ V – Supply Voltage – Always Constant I and CosΦ – Depends on the nature of load Power Quality Improved using DVR

  7. Power Quality / Voltage Quality Issues • Voltage Sag • Voltage Swell Power Quality Improved using DVR

  8. Power Quality / Voltage Quality Issues • Interruption • Harmonics Power Quality Improved using DVR

  9. Outages, 6% Spikes, 7% Swells, Sags, 56% 31% Source: EPRI, 1994 Major Power Quality (PQ) Problems Power Quality Improved using DVR

  10. Textile Industry Plastics Industry Glass Industry Process Industry Semiconductors Rs.60k Rs. 60L Rs6 Cr Rs. 60 Cr Importance of Voltage Sag Losses per Voltage Sag Event Rs.600k Power Quality Improved using DVR

  11. PQ Improvement Techniques • Series Compensation • DVR • SSC • Shunt Compensation • STATCOM • TCSC • Series and Shunt Compensation TCSC • UPFC Power Quality Improved using DVR

  12. Dynamic Voltage Restorer (DVR) • Series compensation device • Protects sensitive electric loads from PQ problems • Implemented through power electronic controllers that use voltage source converters (VSC). Power Quality Improved using DVR

  13. Block Diagram of DVR Power Quality Improved using DVR

  14. a VaN N Operation of DVR Power Quality Improved using DVR

  15. Twentyseven Level Inverter Power Quality Improved using DVR

  16. Questions??? Power Quality Improved using DVR

  17. Thank you Power Quality Improved using DVR

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