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Download A LARGE-POWER VOLTAGE SOURCE CONVERTER FOR FACTS
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A LARGE-POWER VOLTAGE SOURCE CONVERTER FOR FACTS APPLICATIONS COMBINING THREE-LEVEL NEUTRAL-POINT-CLAMPED POWER ELECTRONIC BUILDING BLOCKS ABSTRACT This paper presents a novel large-power voltage source converter (VSC) arrangement suitable for flexible alternating current transmission system applications, achieved by combining four threelevel three-phase neutral-point-clamped inverters by means of intermediate magnetic elements with lower VA rating and size than those of similar existing installations. The 12 inverter poles forming the VSC share a common dc bus and are implemented using standard power electronic building blocks of well-proven reliability. The output voltage is doubled by using an H-bridge configuration, and only a single-secondary grid coupling transformer is required. In addition, the intermediate magnetic elements ensure an equal power sharing between the four inverters. Since they also allow for the harmonic cancellation between the inverter poles and eliminate any third harmonic component created by the modulation, the output voltage waveform has a high quality, often eliminating the need for additional filtering. The two-level (2L) and three-level (3L) neutral-point clamped (NPC) inverters are widely used in industry and also in FACTS devices. Most existing installations make use of these inverters and combine them in series and/or parallel to increase the voltage and current ratings, respectively, achieving output powers of tens of MVARs. This is done at the expenses of using highly complex and bulky intermediate magnetic elements. This paper has presented a large-power VSC suitable for FACTS applications, achieved by combining four 3L-NPC inverters that share a common dc bus, by means of intermediate magnetic elements with a low VA rating. The converter requires a single-line coupling transformer and overall converter size, and footprint is much lower than that of other similar existing installations without impairing the overall efficiency. Moreover, the output voltage has a faster dynamic response and the simulation results are evaluated by MATLAB/SIMULINK. Head office: 2nd floor, Solitaire plaza, beside Image Hospital, Ameerpet, Hyderabad www.kresttechnology.com, E-Mail : [email protected] , Ph: 9885112363 / 040 44433434 1