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Design of Transformer-Less High Power Output Battery Testing System Using Three-Level NPC Inverter
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Abstract
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The main objective of the present work is to extend three-level neutral point clamped (NPC) voltage source converter (VSC) in the application of medium voltage and high power output energy recovery power battery testing system (ERPBTS). Current decoupling scheme based proportional-integral control scheme combined with space vector pulse width modulation (SVPWM), is firstly illustrated to integrate discharging energy to the power grid. Active and reactive power references for the grid-connected inverter are decided according to the discharging energy in dc-dc converter, which could keep the dc-link voltage constant at the same time. The synthesized control scheme for the composited power circuit which is composed of three-level NPC VSC and boost chopper is put forward. It is shown that the proposed scheme could offer less total harmonic distortion and higher dc-bus voltage utilization than that of the conventional power circuit ill ERPBTS. The proposed method is implemented and verified both by simulation and experimental results in an IGBT-based ERPBTS using embedded DSP controller. Copyright (C) 2012 Praise Worthy Prize S.r.l. - All rights reserved.
Keywords:
Energy Recovery
Power Battery Testing System
Three-Level Neutral Point Clamped Inverter
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