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http://dx.doi.org/10.6113/TKPE.2014.19.1.31

Suppression of Common-Mode Voltage in a Multi-Central Large-Scale PV Generation Systems for Medium-Voltage Grid Connection  

Bae, Young-Sang (Dept. of Electrical Eng., EECS Lab, Hanyang University)
Kim, Rae-Young (Dept. of Electrical and Biomedical Eng., Hanyang University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.1, 2014 , pp. 31-40 More about this Journal
Abstract
This paper describes an optimal configuration for multi-central inverters in a medium-voltage (MV) grid, which is suitable for large-scale photovoltaic (PV) power plants. We theoretically analyze a proposed common-mode equivalent model for problems associated with multi-central transformerless-type three-phase full bridge(3-FB) PV inverters employing two-winding MV transformers. We propose a synchronized PWM control strategy to effectively reduce the common-mode voltages that may simultaneously occur. In addition, we propose that the existing 3-FB topology may also have the configuration of a multi-central inverter with a two-winding MV transformer by making a simple circuit modification. Simulation and experimental results of three 350kW PV inverters in a multi-central configuration verify the effectiveness of the proposed synchronization control strategy. The modified transformerless-type 3-FB topology for a multi-central PV inverter configuration is verified using an experimental prototype of a 100kW PV inverter.
Keywords
central inverter; medium voltage; common mode; leakage current;
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Times Cited By KSCI : 2  (Citation Analysis)
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