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V S S U T

V S S U T. Static Voltage Stability Margin Enhancement. V S S U T. INTRODUCTION: Stability Voltage stability and rotor angle stbility Small distrubance voltage stability Large distrubance voltage stability.

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V S S U T

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  1. V S S U T Static Voltage Stability Margin Enhancement Presented By: Sibananda Sahu Regd No. : 10040028

  2. V S S U T INTRODUCTION: Stability Voltage stability and rotor angle stbility Small distrubance voltage stability Large distrubance voltage stability Presented By: Sibananda Sahu Regd No. : 10040028

  3. 1.In static voltage stability, slowly developing changes in the power system occur that eventually lead to a shortage of reactive power and declining voltage . 2. This phenomenon can be seen from the plot of the power transferred versus the voltage at receiving end. The plots are popularly referred to as P-V curve or “Nose” curve 3. . The only way to save the system from voltage collapse is to reduce the reactive power load or add additional reactive power prior to reaching the point of voltage collapse. 4. placing adequate reactive power support at the “weakest bus” enhances static-voltage stability margins V S S U T STATIC VOLTAGE STABILITY Presented By: Sibananda Sahu Regd No. : 10040028

  4. V S S U T STATCOM, TCSC AND SSSC STATCOM is a shunt-connected device, which controls the voltage at the connected bus to the reference value by adjusting voltage and angle of internal voltage source. TCSC device uses thyristor-controlled reactor (TCR) in parallel with capacitor segments of series capacitor bank 3 SSSC is a solid-state synchronous voltage source employing an appropriate DC to AC inverter with gate turn-off thyristor. It is similar to the STATCOM Presented By: Sibananda Sahu Regd No. : 10040028

  5. Voltage Stability Study with FACTS Devices Using CPF V S S U T Presented By: Sibananda Sahu Regd No. : 10040028

  6. TEST SYSTEM • The modified IEEE 14-bus test system is used throughout the study which consists of five synchronous machines, including one synchronous compensator used only for reactive power support and four generators located at buses 1, 2, 6 and 8 • In the system, there are twenty branches and fourteen buses with eleven loads totaling 259 MW and 81.4 Mva V S S U T Presented By: Sibananda Sahu Regd No. : 10040028

  7. Locations and Sizes of STATCOM, TCSC and SSSC • Shunt Compensation Device • The best location for shunt reactive power compensation, as far as the improvement of static voltage stability margin is concerned, is the weakest bus of the system. • method of determining the capacities is to find the relationship between the maximum Loading Factor and the corresponding capacities that the devices can deliver without having the voltage collapse • 2. Series Compensation Device: • Methodology to place series compensation devices is under investigation. • The size of these series devices can be found from the active and reactive power requirement at the collapse point. V S S U T Presented By: Sibananda Sahu Regd No. : 10040028

  8. PV Curves and Voltage Profiles V S S U T Presented By: Sibananda Sahu Regd No. : 10040028

  9. CONTINUE… • From theprevious table, it is obvious that STATCOM gives the maximum LM compared to other devices. • In IEEE 14-bus test system, shunt compensation device provides a higher LM and a better voltage regulation compared to series compensation device • STATCOM provides a better voltage profile at the collapse point compared to other FACTS devices. This is due to the reason that the STATCOM is installed at the weakest bus. • TCSC and SSSC are installed at line 1-5 where the reactive power is supplied only to the line, which may not improve voltage profile throughout the system. STATCOM introduces reactive power at bus 14, which improves voltage profile in its vicinity • Voltage profiles of the system is better in case of SSSC compared to TCSC. SSSC provides both active and reactive power at bus 1-5. Reactive power capacity of SSSC is higher than that of TCSC. Even through voltage at the bus 3 is lowest in case of STATCOM, the LM in this case is highest V S S U T Presented By: Sibananda Sahu Regd No. : 10040028

  10. Power Losses in the System Reactive power losses of the system with STATCOM, TCSC and SSSC 11.Active power losses of the system with STATCOM, TCSC and SSSC

  11. V S S U T • STATCOM provide higher voltage stability margin than TCSC and SSSC • The test system requires reactive power the most at the weakest bus, which is located in the • distribution leveI • 3. Introducing reactive power at this bus using STATCOM can improve loading margin the most. TCSC and SSSC, on the other hand, are series compensation devices, which inject reactive power through the connected line • 4. Real and reactive power losses of these devices are lowest in case of STATCOM, the highest LM case. CONCLUSION Presented By: Sibananda Sahu Regd No. : 10040028

  12. V S S U T THANK U Presented By: Sibananda Sahu Regd No. : 10040028

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