RT info:eu-repo/semantics/article
T1 MMC-based topology for grid connection of wind generators with phase and arm power balancing
A1 Martínez Rodrigo, Fernando
A1 Pablo Gómez, Santiago de
A1 Ramirez, Dionisio
A1 Herrero de Lucas, Luis Carlos
A1 Al-Jawary, Zaid A. H.
K1 Tecnología
K1 Multilevel converter
K1 Wind energy conversion
K1 Wind farms
K1 Wind power grid integration
K1 Conversor multinivel
K1 Conversión de energía eólica
K1 Parques eólicos
K1 Integración de la red de energía eólica
K1 3307 Tecnología Electrónica
AB A new topology of a wind farm wherein the wind generators are integrated into the structure of a modular multilevel converter (MMC) is presented. It allows connecting a group of small/medium size wind turbines to the grid, replacing all the grid side converters of the wind generators by the MMC. The different power generated by each wind generator causes power imbalances that can lead to circulating currents; this paper addresses this problem by analyzing it in a simple way. The analysis shows that power differences between phases are naturally balanced by the DC component of circulating current, without the need to use a specific regulator. However, the power differences between the arms result in a high 50 Hz circulating current. This paper presents the design of a new regulator that corrects these power imbalances by generating a phase difference between the upper and lower arm voltages resulting in an optimal 50 Hz circulating current. The operation of the MMC-based wind farm topology has been tested when all the turbines generate the same power and when they generate significantly different powers. Numerical and real-time simulation results show that the proposed regulator keeps the powers of the MMC phases and arms balanced.
PB Elsevier
SN 0378-7796
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/58681
UL https://uvadoc.uva.es/handle/10324/58681
LA eng
NO Electric Power Systems Research, Volume 218, 2023, 109218
NO Producción Científica
DS UVaDOC
RD 15-may-2024