Generalized Implementation of Switching-Loss-Minimized Space-Vector Modulation for Three-Level Converters
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Date
2015-01-14
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Abstract
With increasing integration of the intermittent and
volatile renewable energy resources into the existing ac grid
infrastructure, the grid stability is decreasing. Large battery
storage systems are proposed to act as short-time buffer to cope
with transient instabilities. A promising converter to interface
such low-voltage high-power battery banks is the T-type Neutral-
Point-Clamped Converter (TNPC). A generalized implementation
of a variant of the well-known space vector modulation featuring
lower losses is proposed in this work. The derived relations to
select a particular switching sequence are based on the binary
logic and symmetry of the possible states in such a three-level
converter. The algorithm proposed in this work dynamically
adjusts the switching sequences to accommodate capacitive as
well as inductive behavior.
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Keywords
Neutral-point-clamped (NPC) converters, bus clamping, space-vector modulation (SVM), pulse-width modulation (PWM), T-type NPC (TNPC)