Abstract
In recent days, the multilevel inverter technology is widely applied to domestic and industrial applications for medium voltage conversion. But, the power quality issues of the multilevel inverter limit the usage of much sensitive equipment like medical instruments. The lower distortion level of the output voltage and current can generate a quality sinusoidal output voltage in inverters and they can be used for many applications. The harmonics can cause major problems in equipments due to the nonlinear loads connected with the power system. So, it is necessary to minimize the losses to raise its overall efficiency. In this paper, a new topology of seven level asymmetrical cascaded H-bridge multilevel inverter with a Fuzzy logic controller had been implemented to reduce the Total Harmonic Distortion (THD) and to improve the overall performance of the inverter. The proposed model is well suited for use with a solar PV application. In this topology, only six IGBT switches are used with three different voltage ratings of PV modules (1:2:4). The lower number of semiconductor switches leads to minimizing overall di/dt ratings and voltage stress on each switches and switching losses. The gate pulses generated by Sinusoidal Pulse Width Modulation (SPWM) technique with a Fuzzy logic controller are also introduced. A buck-boost converter is used to maintain the constant PV voltage level integrated by an MPPT technique followed by Perturb and Observer algorithm is also implemented. The MPPT is used to harness the maximum power of solar radiations under its various climatic conditions. The new topology is evaluated by a Matlab/Simulink model and compared with a hardware model. The results proved that the THD achieved by this topology is 1.66% and realized that it meets the IEEE harmonic standards.
Highlights
The multilevel inverters are getting more popular among the industrial and domestic applications
The results proved that the Total Harmonic Distortion (THD) achieved by this topology is 1.66% and realized that it meets the IEEE harmonic standards
In this paper a new topology of ACHBMLI is presented with a fuzzy logic controller based Sinusoidal Pulse Width Modulation (SPWM) technique and an MPPT controller is implemented for PV on-grid systems with least count of switches
Summary
The multilevel inverters are getting more popular among the industrial and domestic applications. For the optimum operation of power system equipments connected with nonlinear loads, it is necessary to keep the inverter output voltage and current waveform as close as possible to the sinusoidal These inverter topologies can produce a synthesized ac output at any desired level. A cascaded multilevel inverter is broadly considered for the PV power conversion system It is the combination many H-bridge modules with its each output voltage are connected in series. Any number of H-bridge modules can be connected to obtain a desired output voltage level of the cascaded inverter. The number of switches used for this structure is lowest while comparing with the conventional multilevel inverter It can generate the waveform almost closer to sinusoidal. The output voltage for an 11-level cascaded H-bridge multilevel inverter is obtained
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