Active/Reactive Power Control of PV Grid-tied NPC Inverter Using 3-D Space Vector Modulation in abc Coordinate

• Main Authors: Dehghani Tafti, Hossein, Maswood, Ali Iftekhar, Roomi, Muhammad Musthafa
• Other Authors: School of Electrical and Electronic Engineering
• Format: Conference or Workshop Item
• Language: English
• Published: 2016
• Subjects: NPC inverter; Photovoltaic systems; Active power control; Reactive power control; 3-D space vector modulation
• Online Access: https://hdl.handle.net/10356/82232; http://hdl.handle.net/10220/39889; http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=7387072&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D7387072
• Institution: Nanyang Technological University

Flexible active and reactive power injection to the grid is one of the requirements of medium-scale PV power plants (PVPP). Due to the high penetration of installed distributed generation (DG) units to the power system, the flexible active/reactive power control capability is necessary for medium-scale PVPPs in order to maintain the power quality and reliability of the power system. A three-dimensional space vector modulation (3-D SVM) in abc coordinate with combination of proportional-resonant (PR) controller is proposed for 4-wire NPC grid-connected inverter of the multi-string PVPP. The implementation of 3-D SVM in stationary coordinate (???? coordinate) for 4-wire multilevel inverters requires high computational complexity. However, in the proposed 3-D SVM which is implemented in abc coordinate, the computational complexity is decreased and flexible balanced/unbalanced active/reactive power injection capability is achieved. The performance of the proposed controller is investigated on the three-level neutral-point-clamped (NPC) inverter of a 10 kW grid-connected multi-string PVPP, which is considered as the state of the art for medium-scale PVPPs. Various operation conditions like partial shading of PV strings and balanced/unbalanced grid faults are implemented.