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<p>The objective of this study is to present a promising SVPWM method with neutral point voltage (NPV) balancing for a three-level back-to-back (BTB) neutral point clamped (NPC) converter structure used in a direct-drive wind energy conversion systems (WECS). To do this, firstly, a three-dimensional (3-D) <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(mnp\)</EquationSource> </InlineEquation> coordinate-based scheme is developed to identify the sector and triangle of the reference vector location. At this time, the proposed algorithm uses sum values of switching states to simplify the identification of reference vector location and switching vectors to be synthesized. This allows the proposed 3-D SVPWM scheme to offer more flexibility in extending any 2-D SVPWM scheme to 3-D. Secondly, a neutral current and capacitor voltage deviation-based conditionally derived control variable is introduced to adjust the application period of redundant switching vectors to achieve better performance in NPV balancing. Next, the modified time duration calculations are presented using simple arithmetic expressions. Finally, the applicability of the proposed algorithms is verified through 20-MW simulation and 5-kW rated NPC BTB converter fed permanent magnet vernier generator (PMVG)-based WECS experimental setup.</p>

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A Simplified 3-D Coordinate-Based SVPWM with Adjustable Switching Periods of Redundant Vectors for Three-Level NPC Converters in WECS

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Mayilsamy Ganesh,
  • Ramasamy Thirumoorthy,
  • Seong Ryong Lee,
  • Young Hoon Joo,
  • Jae Hoon Jeong

摘要

The objective of this study is to present a promising SVPWM method with neutral point voltage (NPV) balancing for a three-level back-to-back (BTB) neutral point clamped (NPC) converter structure used in a direct-drive wind energy conversion systems (WECS). To do this, firstly, a three-dimensional (3-D) \(mnp\) coordinate-based scheme is developed to identify the sector and triangle of the reference vector location. At this time, the proposed algorithm uses sum values of switching states to simplify the identification of reference vector location and switching vectors to be synthesized. This allows the proposed 3-D SVPWM scheme to offer more flexibility in extending any 2-D SVPWM scheme to 3-D. Secondly, a neutral current and capacitor voltage deviation-based conditionally derived control variable is introduced to adjust the application period of redundant switching vectors to achieve better performance in NPV balancing. Next, the modified time duration calculations are presented using simple arithmetic expressions. Finally, the applicability of the proposed algorithms is verified through 20-MW simulation and 5-kW rated NPC BTB converter fed permanent magnet vernier generator (PMVG)-based WECS experimental setup.