Active and Reactive Power Control in Transmission Line with PSO Optimized PI controlled Five Level UPFC

Abstract

In this paper, particle swarm optimization (PSO) optimized PI controlled five level UPFC is proposed for a double circuit transmission line. To enhance UPFC performance, a different approach is considered here. It uses simplified power system models to derive the decoupled power controllers, but detailed modeling of the UPFC power converters improves their ride-through capability. This paper introduces decoupled linear UPFC power controllers to obtain the reference ac voltages and currents for the two back-to-back-connected three-phase five-level NPC converters that enforce active and reactive power control in the transmission line. This paper proposes three main contributions to increase the dc-link voltage steadiness of multilevel UPFCs under line faults: 1) decoupled active and reactive linear power controllers; 2) real-time PWM generation; and 3) balancing of dc capacitor voltages. The MATLAB/SIMULINK model for the proposed circuit with PSO-optimized PI controlled five level UPFC is shown here with the results.

Introduction

Conclusion

This paper proposes PSO optimization for tuning of PI controller of UPFC which controls active and reactive power flow in double circuit transmission line. Two five level NPC multilevel converters are adopted as shunt and series converters which are connected in back-to-back. The proposed UPFC control strategy includes: 1) decoupled active and reactive linear power control; 2) real-time PWM generation in both UPFC multilevel converters, dc-link voltage control gains with low sensitivity to dc link current, and 3) the balancing of the dc-link capacitor voltages using both multilevel converters. The dc-link capacitor voltages, which are usually balanced using only one of the multilevel converters, are balanced using both series and shunt multilevel converters, the results shows that the proposed technique with PSO gives better results. Optimization by PSO for PI controller gains improves tracking capacity of active and reactive power flow.

References

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Copyright

Copyright © 2022 R Jayachandra, Dr. G. Tulasi Ram Das. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.