Abstract
Three-phase two-level voltage source converters are used for distribution static compensator (DSTATCOM) applications and can be replaced by a multilevel inverter. In this paper, an LCL filter interfaced cascaded H-bridge multilevel inverter-based (CHBMLI) DSTATCOM is simulated and its performance is analyzed considering the system parameters. The analysis considers factors including the switching frequency, modulation index, and filter parameters of a DSTATCOM system. The LCL filter design and analysis for the low switching frequency operation of CHBMLI is proposed in this paper. Phase shift pulse-width modulation is used for the generation of switching signals. The reference current is generated using synchronous reference frame theory (SRFT) for reactive power and harmonic compensations. The simulation model of the CHBMLI-based DSTATCOM system is developed in MATLAB Simulink. The results are demonstrated for a linear/non-linear load under unbalanced conditions, considering the voltage sag and swell in the system due to a disturbance in the load.
Highlights
It is essential to recognize power quality issues in power systems
Generalized phasor diagrams in each phase of the five-level cascaded inverter consists of five leveled outputs, with two H-bridges connected in the cascade. Each phase of this voltage is fed to the distribution line through a coupling inductance, to form a shunt-connected DSTATCOM, as shown in Figure 2, where V sa, V sb, and V sc are the source phase voltages that are connected to a nonlinear load or reactive load
The cascaded H-bridge multilevel inverter-based (CHBMLI)-based DSTATCOM developed in developed in MATLAB Simulink (2014b, MathWorks, Natick, MA, USA) was analyzed for linear and MATLAB Simulink (2014b, MathWorks, Natick, MA, USA) was analyzed for linear and non-linear non-linear loads under unity power power factor (UPF) operation
Summary
It is essential to recognize power quality issues in power systems. Power quality refers to a system’s ability to maintain a sinusoidal power distribution voltage and current at a rated magnitude and frequency. Cascaded H-bridge MLI (CHBMLI) have the advantages of lower operating switching frequencies, a reduced electromagnetic interference, and a modular structure It requires separate DC sources/capacitors for each bridge. Clamping capacitors [15,16] In such inverter topologies, the switching of power electronic devices injects higher level harmonics into the grid. Sinusoidal PWM (SPWM) offers a nearly constant switching frequency and reduced complexity for MLIs when compared to other modulation techniques, including hysteresis current control and space vector modulation (SVM), which have contrasting disadvantages. A five-level CHBMLI-based DSTATCOM is implemented and a phase-shift PWM technique is adopted for the generation of switching signals, because of the uniform distribution of power stress on each switching device. The proposed system is investigated considering the effect of change in the dc voltage capacitance and switching frequency on the dc bus voltage under transient conditions
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