Electrical transmission or interconnection systems – With harmonic filter or neutralizer
Patent
1992-12-15
1994-08-30
Sterrett, Jeffrey L.
Electrical transmission or interconnection systems
With harmonic filter or neutralizer
307 46, 363 40, 363 44, H02J 301
Patent
active
053430794
ABSTRACT:
A standby power supply system is provided for supplying normal AC power to a critical load from an AC power source during normal operating conditions, and for supplying emergency AC power to the load during failure of the AC power source. During normal operation, the standby power supply system actively neutralizes undesirable harmonic components in the input current drawn by the load. The standby power supply system includes a power conversion device having a DC side coupled to a back-up power source and an AC side in parallel with the load and the AC source. A harmonic distortion sensor senses a harmonic distortion current component of a load current drawn by the load during normal operating conditions. A controller is responsive to the harmonic distortion sensor for causing the power conversion device to produce a harmonics neutralizing current to substantially neutralize the harmonic distortion current component produced by the load. A method is also provided for supplying AC power to a load during normal and emergency operating conditions.
REFERENCES:
patent: 4053820 (1977-10-01), Peterson et al.
patent: 4224660 (1980-09-01), Mohan
patent: 4706860 (1990-03-01), Asaeda
patent: 4812669 (1989-03-01), Takeda et al.
patent: 4967334 (1990-10-01), Cook et al.
patent: 5047909 (1991-09-01), Hosada
patent: 5172009 (1992-12-01), Mohan et al.
patent: 5221862 (1993-06-01), Fiorina et al.
Mohammad-Reza Ghotbi, "Line-Current Harmonics-Neutralized Uninterruptible Power Supplies," a Thesis Submitted to the University of Minnesota (Jul. 1990).
T. Kawabata, et al., "Chargerless UPS Using Multi-Functional BIMOS Inverter . . . ", Conference Record of the 1986 IEEE Industry Applications Society Annual Meeting, vol. 1, pp. 513-520 (Sep. 28, 1986).
T. Kawabata, et al., "UPS Systems Using Multi-Functional Inverters", INTELEC '87: Ninth International Telecommunications Energy Conference . . . Proceedings, pp. 525-530 (Jun. 14, 1987).
T. Kawabata, et al., "Three Phase Parallel Processing UPS Using Multi-Functional Inverter," 1989 IEEE IAS Annual Meeting, pp. 982-987.
H. Yonemori, et al., "A Novel Type of High-Quality UPS System . . . ", Official Proceedings of the First International PCIM '88 (Power Conversion) Conference, pp. 324-332 (Dec. 8, 1988).
S. Manias, et al., "Bilateral DC to AC Converter Employing a High Frequency Link," 1985 IEEE/IAS Annual Meeting Record, pp. 1156-1162.
P. K. Sood, et al., "A Versatile Power Converter for High Frequency Link Systems," APEC/IEEE (1987) pp. 249-256.
T. Shirae, et al., "Development of Five Novel 10 KaVA UPS's for Office Use," 1990 IPEC Conference (Tokyo, Japan), pp. 91-98.
M. Koyama, et al., "High Frequency Link DC/AC Converter with PWM Cycloconverter for UPS," 1990 IPEC Conference (Tokyo, Japan), pp. 748-754.
T. A. Lipo and P. K. Sood, "Study of Generator/Motor Operation of Induction Machines in a High Frequency Link Space Power System," NASA Contractor Report No. 179600, Prepared for the Lewis Research Center Under Grant No. NAG3-631 (Mar. 1987), Abstract.
Grady et al., "Improving Power Quality with Active Power Line Conditioners," Mitigation Techniques II, 1991.
Grady, "Recommended Practices in Power Quality: IEEE 519 and IEC 555 Guidelines," Leveraging Technology to Enhance Customers' Power Quality Workshop, (Teaneck, New Jersey), Jul. 29, 1992.
IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems, Project IEEE-519, Oct. 1991.
Mohan Ned
Peterson Maximilian R.
Quinn Conor A.
Regents of the University of Minnesota
Sterrett Jeffrey L.
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