UPQC ppt main

power quality improvement bu using UPQC and MVC

1. U.N.S.I.E.T. V.B.S.P.U. JAUNPUR AKASH VISHWAKARMA (215507) ANUP SHARMA (215515) VIJAY PRATAP (215519 ) POWER QUALITY IMPROVEMENT USING UNIFIED POWER QUALITY CONDITIONER (UPQC) UNDER THE SUPERVISION OF Mr. ANURAG SINGH

2. Contents:- Objectives Introduction Introduction to UPQC Disturbance in waveform Block diagram of UPQC Active power filter Multivariable controller Simulink model Simulink output Advantages, Disadvantages and Applications Conclusion

3. Objectives To improve the waveform of the Alternating Current and voltage from a disturbed signal. Study the UPQC model for power quality improvement. Improvement of power quality by using UPQC and MVC

4. Introduction Disturbance in electrical circuit The main cause for distortion is harmonics, notching, and interharmonics . Distortion is that the fundamental frequency sine wave is represented as super position of all harmonic frequency sine waves on fundamental sine wave. UPQC  is a multifunction power conditioner that can be used to compensate various voltage disturbances of the power supply, to correct voltage fluctuation, and to prevent the harmonic load current from entering the power system.

5. Introduction of UPQC The Unified Power Quality Conditioner (UPQC), which was first presented in 1995 by Hirofumi Akagi . It reduces the harmonics in the supply current, so that it can improve utility current quality for nonlinear loads. UPQC provides the VAR requirement of the load, so that the supply voltage and current are always in phase; therefore, no additional power factor correction equipment is required. UPQC maintains load end voltage at the rated value even in the presence of supply voltage sag.

6. Disturbance in waveform Due to Non-linear load. Ex BJT, MOSFET Due to voltage sag, voltage swell, Interruption. Voltage Fluctuation Waveform disturbance due to DC offset, Noise, Notching, Harmonics

7. Disturbed Waveform due to noise

8. Working of UPQC Basically UPQC (Unified Power Quality conditioner) is a equipment which is used for compensate for voltage distortion and voltage unbalance in a power system UPQC provides the VAR requirement of the load, so that the supply voltage and current are always in phase; therefore, no additional power factor correction equipment is required.

9. Block diagram of UPQC

10. Active Power Filter Active power filters were used for power quality improvement. Two types of filter used in UPQC Shunt Active Power Filter The main objectives of the shunt active filter are: to compensate for the load reactive power demand and unbalance, to eliminate the harmonics from the supply current, and to regulate the common dc link voltage.

11. 2. Series Active power filter:- A series APF injects a voltage component in series with supply voltage and removes harmonic component. After that the reference voltage is given to hysteresis voltage controller with the actual output voltage of series APF and the PWM signal is generated which is given to voltage source inverter. The DC voltage is given across VSI so to get real power difference between source and load.

12. Multivariable Controller Multivariable processes has more than one input variables or more than one output variables. Here are a few examples of multivariable processes: It generate the PWM signal It works as the feedback of UPQC

13. Simulink model of UPQF for power improvement

14. Noisy or disturbed waveforms The supply voltage waveform which is injected in UPQC. This is a disturbed waveform shown below-

15. Compensated waveform of source voltage:-

16. Compensated waveform of Alternating current:-

17. Advantages of UPQC:- Reduction in harmonics, noise and any disturbed signal. Improve the quality of power. Waveform quality is very good. In any generation system if disturbance occurs then it can be reduced

18. Disadvantage of UPQC:- Central control is required and it is complicated. Conduction loss is high. Capacity expansion is difficult.

19. Applications It has to be observe to be satisfaction for various power quality improvement. It is useful for balancing power factor, voltage and current harmonic mitigation. Mitigation of voltage sag, swell and voltage dip. Source current THD and load voltage THD improved. In addition of this performance of UPQC has been found satisfactory during transient condition.

20. Conclusion Here Unified power Quality Conditioner work with Multivariable Controller as a feedback and give us a desired alternating waveform. In this input waveforms are full from noise and we can say that it is an disturbed waveform but after entering inside the UPQC and MVC as a feedback it gives us an pure alternating waveforms