Abstract
This paper presents a binary hybrid multilevel inverter (BHMLI) based grid-connected solar energy conversion system (SECS), controlled by damped second-order generalized integral (DSOGI). The BHMLI architect has a cascaded half-bridge array, which modifies the DC-link of the H-bridge of the voltage source inverter, and results in approximate reference waveform. It reduces the dV/dt of the H-bridge switches and improves output waveform quality. The DSOGI control damps the oscillations and overshoots and provides longer service period of low power switches at transient conditions. It is implemented in the multilevel inverter application for the first time in literature. The SECS is designed to inject active power to the grid, and also mitigates the harmonic and reactive power demands of the load. The cascading of n' half-bridges and one H-bridge generate (2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(nC1)</sup> - 1) output voltage levels. The maximum power extraction from solar photovoltaic (PV) array is achieved through incremental conductance (IC) algorithm based maximum point tracking (MPPT) operation of the DC-DC converter. An isolated single-input multiple-output single-ended primary inductance converter (SIMO-SEPIC) realizes it. SECS with 15-level BHMLI is analyzed with extensive simulation as well as with a hardware prototype. Moreover, the shunt active filter functionality of the system at various load conditions are verified and maintained the grid power quality within the IEEE-519 standard throughout the operation. The laboratory developed setup is tested for 5 kW, 400 V, three-phase system, and the experimental analysis at steady-state and dynamic variations of load-side and insolation variations validate the theoretical claims.
Highlights
The rapid growth of electrical energy demand as well as the requirement of clean and free energy for environmental safety, give a spotlight to the renewable energy (RE) based power generation, and it is increasing globally at a fast scale
This paper reports a fifteen-level binary hybrid multilevel inverter in solar energy conversion system (SECS)
The system is designed in a way that, the SECS supporting the nonlinear load demand, connected at the point of common coupling (PCC) and the remaining power is delivered to grid at rated insolation (1000 W /m2)
Summary
The rapid growth of electrical energy demand as well as the requirement of clean and free energy for environmental safety, give a spotlight to the renewable energy (RE) based power generation, and it is increasing globally at a fast scale. A conventional two-level (2L) inverter-based solar energy conversion system (SECS) is reported in [2], where a controller of modified proportional-resonant (M-PR) is operating both in stand-alone as well as grid-connected modes. The CHB inverters are a prevalent MLI, and it provides a highly modular topological structure and higher power transfer capabilities It requires a large number of switches for higher output voltage levels and isolated DC sources. A nine-level, grid-connected inverter for PV application, based on two CHBs with different dc-link voltages is reported in [12]. For a large grid-connected solar energy conversion systems are using modified accurate hill-climbing techniques to improve the overall dynamic performances [30] Another inevitable part of the SECS is grid synchronization control.
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