Title :
Design and control of a grid-connected three-phase 3-level NPC inverter for Building Integrated Photovoltaic systems
Author :
Kim, Youngroc ; Cha, Hanju ; Song, Byeong-Mun ; Lee, Kwang Y.
Author_Institution :
Dept. of Electr. Eng., Chungnam Nat. Univ., Daejeon, South Korea
Abstract :
This paper presents the design and control of a grid-connected three-phase 3-level Neutral Point Clamped (NPC) inverter for Building Integrated Photovoltaic (BIPV) systems. The system consists of a PV array, boost DC/DC converter, 3-level NPC inverter, LC filter and the grid. The 3-level NPC inverter is designed without a galvanic isolation transformer and its current controller is developed to minimize leakage currents though common-mode voltage loops in the PV systems. A prototype 13kW NPC inverter with a LC filter was fabricated and tested, resulting in a low total harmonics distortion (THD) of less than 3% THD and 97.5% efficiency at the peak load. The detail simulation and test results are discussed.
Keywords :
DC-DC power convertors; building integrated photovoltaics; electric current control; harmonic distortion; invertors; leakage currents; machine control; power grids; power harmonic filters; power transformers; solar cell arrays; LC filter; PV array; PV systems; boost DC-DC converter; building integrated photovoltaic systems; common-mode voltage loops; current controller; galvanic isolation transformer; grid-connected three-phase 3-level NPC inverter; grid-connected three-phase 3-level neutral point clamped inverter; harmonics distortion; leakage currents minimization; prototype NPC inverter; Arrays; Inverters; Power harmonic filters; Pulse width modulation; Switches; Switching frequency; A transformerless 3-level NPC inverter; BIPV; LC filter; PV inverter; current control;
Conference_Titel :
Innovative Smart Grid Technologies (ISGT), 2012 IEEE PES
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4577-2158-8
DOI :
10.1109/ISGT.2012.6175663
