Title :
Cascaded Two-Level Inverter-Based Multilevel STATCOM for High-Power Applications
Author :
Babu, N. N. V. Surendra ; Fernandes, B.G.
Author_Institution :
Electr. Eng. Dept., Indian Inst. of Technol. Bombay, Mumbai, India
Abstract :
In this paper, a simple static var compensating scheme using a cascaded two-level inverter-based multilevel inverter is proposed. The topology consists of two standard two-level inverters connected in cascade through open-end windings of a three-phase transformer. The dc-link voltages of the inverters are regulated at different levels to obtain four-level operation. The simulation study is carried out in MATLAB/SIMULINK to predict the performance of the proposed scheme under balanced and unbalanced supply-voltage conditions. A laboratory prototype is developed to validate the simulation results. The control scheme is implemented using the TMS320F28335 digital signal processor. Further, stability behavior of the topology is investigated. The dynamic model is developed and transfer functions are derived. The system behavior is analyzed for various operating conditions.
Keywords :
digital signal processing chips; invertors; power supplies to apparatus; power system dynamic stability; static VAr compensators; transfer functions; transformer windings; voltage control; DC link voltage regulation; Matlab; Simulink; TMS320F28335 digital signal processor; cascaded two level inverter-based multilevel STATCOM; dynamic model; high-power applications; laboratory prototype; open end windings; standard two-level inverter; static var compensating scheme; three-phase transformer; topology stability behavior; transfer functions; unbalanced supply voltage condition; Automatic voltage control; Capacitors; Inverters; Reactive power; Topology; Transfer functions; DC-link voltage balance; multilevel inverter; power quality (PQ); static compensator (STATCOM);
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2014.2305692
