A FPGA-Based Generalized Pulse Width Modulator for Three-Leg Center-Split and Four-Leg Voltage Source Inverters

• Published in: IEEE transactions on power electronics Vol. 23; no. 3; pp. 1472 - 1484
• Main Authors: DAI, Ning-Yi, WONG, Man-Chung, NG, Fan, HAN, Ying-Duo
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active control; Active filters; Active power filter; Applied sciences; Circuit properties; Circuit topology; Control systems; Convertors; Digital circuits; Electric potential; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical equipment; Electrical machines; Electrical power engineering; Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Field programmable gate arrays; four-leg voltage source inverter; Inverters; Mathematical analysis; Modulators; Power electronics; Power networks and lines; Power supply; Prototypes; Pulse duration modulation; Pulse inverters; Pulse width; Pulse width modulation; Pulse width modulation inverters; Pulsed power supplies; three-leg center-split voltage source inverter (VSI); three-phase four-wire; Uninterruptible power systems; Users connections and in door installation; Voltage control; Wire; Prototype; Power supply; three-phase four-wire; Implementation; Active filter; Multilevel system; three-leg center-split voltage source inverter (VSI); Pulse width; four-leg voltage source inverter; Codesign; Control system; Connection; Power electronics; Field programmable gate array; Experimental study; Algorithm; Pulse modulator; Voltage source converter; Power filters; Control center; Active power filter; Uninterruptible power supply; Three phase circuit; System simulation; Pulse duration modulation
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2008.921103

In this paper, a generalized pulse width (PW) modulator is proposed which can control three-leg center-split voltage source inverters (VSIs) and four-leg VSIs from two-level to multilevel topologies. VSIs with a neutral wire connection are important for power electronics applications in three-phase four-wire systems, such as active power filters and uninterruptible power supplies. For medium and large capacity applications, a multilevel three-phase four-wire VSI is a good alternative to a two-level one. However, implementing the pulse width modulation for three-phase four-wire VSIs involves complex calculations, and control algorithms differ for VSIs of different levels and topologies. The proposed generalized PW modulator controls VSIs based on voltage-second approximation, but its implementation is much easier than space vector modulation. Field programmable gate array has been chosen to implement the PW modulator due to its fast prototyping, simple hardware, and software design. Simulation and experimental results are provided. The proposed generalized PW modulator was also applied to the control system of three-phase four-wire active power filters to show its validity.