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In this investigation, a study on grid-connected Photovoltaic (PV) system with single stage power conversion (SSPC) is proposed. Double Stage Power Conversion (DSPC) topology contains two power conversion stages namely DC-DC conversion and DC-AC conversion, but the SSPC system converts DC power to high-quality AC power supply for grid connected PV system. The SSPC system has several advantages over DSPC, such as better use of the PV arrays, higher efficiency, low cost and compact size. Present work proposes a Sinusoidal Pulse Width Modulation (SPWM) along with incremental conductance Maximum Power Point Tracking (IC-MPPT) for inverter switching. The PV voltage and Grid Voltages verifies under normal and change of atmospheric conditions using MATLAB / SIMULINK.

In the grid-connected photovoltaic (PV) system, the array forms DC power. This generated power, a two-way grid process is called DC – DC – AC as a two-stage power conversion and, secondly, a DC-AC with a reduced circuit is called a single Stage Grid – Connected PV (SSGCPV) system. SSGCPV is more advantageous for reduced complexity, reliability and efficiency, in order to reduce the number of step-up transformer power with conventional inverter (or transformer) with less high PV voltage. This paper proposes a detailed review of the few configurations of the SSGCPV inverter system and also discusses its control strategy for tracking maximum power and generating pulses to obtain the required output power.

Multilevel inverters are superior to the two-level inverters to meet medium and high-power applications. A seven-level diode-clamped multilevel topology (7L-DCMT) proposed, and compare the advantages and disadvantages of various control strategies such as multilevel space vector pulse width modulation (MSVPWM) with multicarrier sinusoidal pulse width modulations (MCSPWM) named as level shift and phase shift PWM based on the position of carriers at certain frequency. In level shift is further divided and compare the Inphase disposition sinusoidal pulse width modulation (IPD-SPWM), phase opposition and disposition-sinusoidal pulse width modulation (POD-SPWM), alternate phase opposition and disposition-sinusoidal pulse width modulation (APOD-SPWM) and carrier phase displacement sinusoidal pulse width modulation (CPD-SPWM). The 7L-DCMT designed with MATLAB/SIMULINK and the performance can analyses based on the observing total harmonic distortion (THD) at different control strategies.

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