Intelligent power factor compensation equipment of three phase low voltage loads

Abstract

An intelligent power factor correction scheme is presented for three phase low power factor loads. This new scheme is able to perform individual phase sensing of parameters by monitoring at all times to sense a change in system parameters and affects individual phase correction by applying the exact amount of reactive components needed for each phase, and can also reduce negative sequence current caused by the load to improve system balance. An optimization criterion is used for the proper calculation of reactive power steps in a power compensation installation of capacitor banks. The criterion is enabled by sampling measurements performed on the electrical plant examined within specific interval of time.

Keywords

power factor correction / individual phase sensing / negative sequence current / system balance

References

[1] El-BolokH M, MasoudM E, MahmoudM M. A microprocessor-based adaptive power factor corrector for nonlinear loads [J]. IEEE Trans on Industry Electronics, 1990, 37(1): 272-277

[2] LuoAn, LiJuan, QiMingjun. An intelligent device for var compensation [J]. Automation of Electric Power Systems, 1999, 23(3): 50-54

[3] Lee-HungCheng, Wei-JenLee, Mo-ShingChen. Using a static var compensator to balance a distribution system[J]. IEEE Trans Industry Application, 1999, 35(2): 3-4

[4] MillerT J EReactive power control in electric system[M], 1982, New York, Wiley

[5] Kundur P. Power system stability and control[M]. McGraw-Hill, Inc, 1994. 627–690.

[6] ArindamGhosh, AvinashJoshi. A new approach to load balancing and power factor correction in power distribution system[J]. IEEE Trans on Power Delivery, 2000, 15(1): 735-740

[7] PaulS, BasuS K, MondalR. A microcomputer controlled static var compensator for power systems laboratory experiments[J]. IEEE Trans on Power System, 1992, 7(1): 403-409

[8] AndreaCavallini, GiovanniMazzanti, GianCarlo Montanari, et al.. Design of shunt capacitor circuits for power factor compensation in electrical systems supplying nonlinear loads: a probabilistic approach[J]. IEEE Trans on Industry Applications, 1998, 34(4): 7-8