Mitigation of Voltage Sag and Swell for Power Quality Improvement Using Distributed Power Flow Controller

 

 ABSTRACT:

During the last two decades, the operation of power systems has become complex due to growing consumption and increased number of non-linear loads because of which compensation of multiple power quality issues has become an compulsion. A new component within the flexible AC-transmission system (FACTS) family, called distributed Power-flow controller (DPFC) is presented in this paper.

The DPFC is derived from the unified power-flow controller (UPFC). The DPFC can be considered as a UPFC with an eliminated common dc link. The active power exchange between the shunt and series converters, which is through the common dc link in the UPFC, is now through the transmission lines at the third-harmonic frequency.

The DPFC employs the distributed FACTS (DFACTS) concept, which is to use multiple small-size single-phase converters instead of the one large-size three-phase series converter in the UPFC. Power quality issues are studied and DPFC is used to mitigate the voltage deviation and improve power quality. In this paper, the capability of DPFC is observed for the transmission line based on PI and fuzzy logic controllers (FLC). On comparing the two controllers performance, we can say that Fuzzy Logic Controller based DPFC gives better compensation than PI Controller based DPFC. Matlab/Simulink is used to create the PI and FLC and to simulate DPFC model.

 SOFTWARE: MATLAB/SIMULINK

 BLOCK DIAGRAM:

Fig 1 The DPFC Structure

EXPECTED SIMULATION RESULTS:

 

 Fig 2 Voltage Sag without DPFC

 Fig 3 Current Swell without DPFC

Fig 4 THD without DPFC

Fig 5 Voltage sag Compensation with DPFC using PI Controller

Fig 6 Current Swell Compensation with DPFC using PI Controller

Fig 7 THD with DPFC using PI Controller

Fig: 8 Voltage Sag Compensation with DPFC using Fuzzy Logic Controller

Fig: 9 Current Swell Compensation with DPFC using Fuzzy Logic Controller

Fig 10 THD with DPFC using Fuzzy Logic Controller

 CONCLUSION:

This paper has presented mitigation of various power quality issues like voltage sag and swell by employing a new FACTS device called Distributed Power Flow Controller(DPFC).

The DPFC .is emerged from the UPFC and inherits the control capability of the UPFC, which is the simultaneous adjustment of the line impedance, the transmission angle, and the bus voltage magnitude.

The common dc link between the shunt and series converters, which is used for exchanging active power in the UPFC, is eliminated.

This power is now transmitted through the transmission line at the third harmonic frequency.

The series converter of the DPFC employs the D FACTS concept, which uses multiple small single phase converters instead of one large size converter. The reliability of the DPFC is greatly increased because of the redundancy of the series converters.

The total cost of the DPFC is also much lower than the UPFC, because no high voltage isolation is required at the series converter part and the rating of the components of is low.

It is proved that the shunt and series converters in the DPFC can exchange active power at the third harmonic frequency, and the series converters are able to inject controllable active and reactive power at the fundamental frequency.

Also the performance of DPFC is simulated using two mechanisms i.e., with PI and Fuzzy controllers Simulation is also carried without these two controllers.

In this case study three phase fault is injected into the system near the load and the results prove that the DPFC with Fuzzy controller gives better voltage compensation than DPFC with PI controller.

REFERENCES:

(1) Zhihui Yuan, Sjoerd W.H de Haan, Braham Frreira and Dalibor Cevoric “A FACTS Device: Distributed Power Flow Controller (DPFC)” IEEE Transaction on Power Electronics, vol.25, no.10,October 2010.

(2) L. Gyugyi, C. D. Schauder, S. L. Williams, T. R. Rietman, D. R. Torgerson,and A. Edris. “The unified power flow controller: a new approach to power transmission control”. Power Delivery, IEEE Transactions on, 1995.

(3) Y. H. Song and A. Johns. Flexible ac transmission systems (FACTS). Institution of Electrical Engineers, 1999.

(4) ” Power quality improvement and Mitigation case study using Distributed Power Flow Controller “Ahmad Jamshidi ,S.Masoud Barakati and Mohammad Moradi Ghahderijani,IEEE Transactions on,2012

(5) N.G.Hingorani and L.Gyugyi, Understanding FACTS, Concepts and Technology of Flexible AC Transmission Systems. Piscataway, NJ: IEEE Press 2000

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