Design and Simulation of Cascaded H-Bridge Multilevel Inverter Based DSTATCOM for Compensation of Reactive Power and Harmonics Latest Electrical projects


This paper presents an investigation of five-Level Cascaded H – bridge (CHB) Inverter as Distribution Static Compensator (DSTATCOM) in Power System (PS) for compensation of reactive power and harmonics. The advantages of CHB inverter are low harmonic distortion, reduced number of switches and suppression of switching losses. The DST ATCOM helps to improve the power factor and eliminate the Total Harmonics Distortion (THD) drawn from a Non-Liner Diode Rectifier Load (NLDRL). The D-Q reference frame theory is used to generate the reference compensating currents for DSTATCOM while Proportional and Integral (PI) control is used for capacitor dc voltage regulation. A CHB Inverter is considered for shunt compensation of a 11 kV distribution system. Finally a level shifted PWM (LSPWM) and phase shifted PWM (PSPWM) techniques are adopted to investigate the performance of CHB Inverter. The results are obtained through Matlab/Simulink software package.


  2. Level shifted Pulse width modulation (LSPWM)
  3. Phase shifted Pulse width modulation (PSPWM)
  4. Proportional-Integral (PI) control
  5. CRB multilevel inverter
  6. D-Q reference frame theory




Fig. 1 Schematic Diagram of a DST ATCOM


Fig. 2 Block diagram of 5-level CHB inverter model



Fig. 3 five level PSCPWM output


Fig. 4 Source voltage, current and load current without DSTATCOM


Fig. 5 DC Bus Vooltage


Fig. 6 Phase-A source voltage and current


Fig. 7 Harmonic spectrum of Phase-A Source current without DSTATCOM


Fig. 8 Harmonic spectrum of Phase-A Source current with DSTATCOM


A DSTATCOM with five level CHB inverter is investigated. Mathematical model for single H-Bridge inverter is developed which can be extended to multi H Bridge. The source voltage , load voltage , source current, load current, power factor simulation results under nonlinear loads are presented. Finally Matlab/Simulink based model is developed and simulation results are presented.


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