An Improved Coordinated Control Strategy for PV System Integration with VSC-MVDC Technology

• Main Authors: Yanbo Che, Wenxun Li, Xialin Li, Jinhuan Zhou, Shengnan Li, Xinze Xi
• Format: Article
• Language: English
• Published: MDPI AG 2017-10-01
• Series: Energies
• Subjects: coordinated control strategy; MVDC (Medium Voltage Direct Current); PV (PhotoVoltaic); VSC (Voltage Source Converter)
• Online Access: https://www.mdpi.com/1996-1073/10/10/1670

The rapid development of renewable energy calls for feasible and reliable technologies to transmit and integrate power into grids. Voltage Source Converter (VSC)- Direct Current (DC) technology is considered as a promising solution for its independent control of active and reactive power. Modeling and coordinated control of a large-scale concentrating photovoltaic integration system with VSC-MVDC (Voltage Source Converter-Medium Voltage Direct Current) technology have been investigated in this paper. The average controlled-source model of PhotoVoltaic (PV) integration system is firstly established. Then, a novel control strategy without fast communication is proposed to improve the reliability of the coordinated control system. An extra voltage loop is added to the basic control block, which is able to assure stable operation of the PV system in various conditions. Finally, the proposed control strategy is verified with simulation results.