Abstract
Recently, multilevel inverters are more researched due to the advantages they offer over conventional voltage source inverters in grid connected applications. Passive filters are connected at the output of these inverters to produce sinusoidal waveforms with reduced harmonics and to satisfy grid interconnection standard requirements. This work proposes a new passive filter topology for a pulse width modulated five-level cascaded inverter interfaced grid connected system. The proposed passive filter inserts an additional resistance-capacitance branch in parallel to the filter capacitor of the traditional inductive–capacitive–inductive filter in addition to a resistance in series with it to reduce damping power loss. It can attenuate the switching frequency harmonic current components much better than the traditional filter while maintaining the same overall inductance, reduced capacitance and resistance values. The basic parameter design procedure and an approach to discover the parameters of the proposed filter is introduced. Further, a novel methodology using Particle Swarm Optimization (PSO) is recommended to guarantee minimum damping loss while ensuring reduced peak during resonance. In addition, PSO algorithm is newly employed in this work to maximize harmonic attenuation in and around the switching frequency on the premise of allowable values of filter inductance and capacitance. A comparative discussion considering traditional passive filters and the proposed filter is presented and evaluated through experiments conducted on a 110 V, 1 kW five-level grid connected inverter. The modulation algorithm for the multilevel inverter is implemented using a SPARTAN 6-XC6SLX25 Field Programmable Gate Array (FPGA) processor. The analysis shows that the proposed filter not only provides decreased damping power loss but also is capable of providing considerable harmonic ripple reduction in the high frequency band, improved output waveforms and lesser Total Harmonic Distortion (THD) with improved power quality for the multilevel inverter based grid connected system.
Highlights
Voltage source inverters are a key component in most PV systems installed for grid connected and standalone applications [1,2,3,4]
The analysis shows that the proposed filter provides decreased damping power loss and is capable of providing considerable harmonic ripple reduction in the high frequency band, improved output waveforms and lesser Total Harmonic Distortion (THD) with improved power quality for the multilevel inverter based grid connected system
CHBbased inverter based on Field Programmable Gate Array (FPGA) processor is developed as per specifications is simulated using a programmable ac sourceac(Chroma
Summary
Voltage source inverters are a key component in most PV systems installed for grid connected and standalone applications [1,2,3,4]. Multiple traps tuned to different frequencies require judiciously selected components to attain desired harmonic attenuation Another novel passive filter, namely, L(LCL) , is employed for a grid inverter in [24], where a design bench mark is utilized to obtain the filter component values and the inductance present in the filter design is optimized using Genetic algorithm. This work includes the basic parameter design procedure with expressions to arrive at individual filter component values of the proposed filter in addition to a novel technique using PSO to minimize damping power loss, while ensuring reduced resonant peaking. PDPWM modulation technique [33], which is well discussed in the literature, is used to generate gate signals for the five-level inverter
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