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from Reduced Switches Count of Five Level H-bridge Inverter with Integrated Boost Converter
by IJRASET
Among all these MLI cascaded H- bridge inverter requires less no.of power switching components and has a higher efficiency and has simple circuit layout. So, CHB MLI is suitable for PV panels but it requires more no.of PV panels in series or parallel connection when no.of levels increases. Therefore no.of switches increases when the level of inverter increases. The no.of switches in MLI defines cost, the size of the circuit, reliability and complexity. So the key element in designing MLI is the no.of switches required against the required voltage. To obtain the same output as in a 5-level CHB MLI, a new circuit design has been developed with reduced no.of switches without increasing the no.of H-bridges. The new 5-level CHB MLI is to contributes less numbers of power switching components and less switching and conduction losses and increases the inverter efficiency. In this proposed model, we are employing a dc-dc boost converter which is regulating SPV array voltage and power according to INC (Incremental Conductance) MPPT (Maximum Power Point Tracking Algorithm) .The output power is fed to a 5-level reduced switch count h-bridge inverter, which is controlled using a phase shifted sinusoidal pulse width modulation (PSCPWM) control mechanism.
Fig.1. Proposed SPV fed 5-level RSMLI
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II. PROPOSED SYSTEM CONFIGURATION AND DESIGN
The proposed reduced switch count five level H-bridge inverter with integrated boost converter in the solar PV system is shown in Fig.1. The PV array converts solar energy to electrical power and is regulated by a boost converter. The boost converter is controlled based on the INC MPPT algorithm. It generates a duty cycle (D). The boost converter is followed by a reduced switch count, 5-level H-bridge inverter. The phase shifted sinusoidal pulse width modulation (PSCPWM) control technique is used for controlling the gating pulse of the 5-level reduced switch h-bridge inverter.
A. PV array Design PV modules are an extremely suitable DC source for the cascaded H-bridge MLI units. The single diode model of a solar cell is shown in fig. 2.The equations that represent PV model are well known as given in [9]. P-V and I-V characteristics of PV system as shown in fig.3
Fig.2. Single Diode Model of a Solar cell
Fig.3. PV and IV Characteristics
