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NPC Three Level Inverter With Dual DC Bus For Independent Distributed Generators. Neutral-Point Voltage Balancing Under The Input Power Imbalance.
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| Author(s) |
MILOSZ SZAREK |
| Abstract |
This paper concerns the application of three-level neutral point clamped (NPC) voltage source inverter (VSI) to electrical energy conversion of the photovoltaic (PV) power plant. The grid-connected3-phase NPC inverter is powered via the split DC-link composed of the capacitive divider. It enables the usage of two DC-buses independently which can be supplied by the separated boost-typeDC-DC converters. They are used to generate the maximal power value (MPP) from each string of PV modules. The main objective of this paper is the analysis of a DC-link voltage unbalance effect anddevelopment of dedicated balancing control algorithm based on the 7-segment space vector modulation method (SVM). The goal of proposed solution is proper operation of the three-phase NPCinverter under permanent input PV power unbalance. In the presented paper the maximal permissible level of input power unbalance was estimated which can be compensated by the use ofdeveloped NPC inverter modulation method as a function of the instantaneous operation point (e.g. amplitude modulation index). The listed issues were verified via simulation research performed in Maltab\Simulink software as well as experimentally via the laboratory tests. |
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| Filename: | 0470-epe2017-full-12393437.pdf |
| Filesize: | 1.057 MB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-17 by System |
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