Binary Hybrid Multilevel Inverter-Based Grid Integrated Solar Energy Conversion System With Damped SOGI Control

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 (nC1) − 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 multipleoutput 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. INDEX TERMS Multilevel inverter, SIMO-SEPIC, solar PV, power quality.

Critical Analysis on Multilevel Inverter Designs For Renewable Energy Grid

“…When contrasted withmany comparable architectures, the suggested MI looks to have some promising qualities. In author [10] designed and tested a grid-connected solar energy conversion system based on a binary hybrid MLI. Ten semiconductor switches and three binary weighted isolated DCsources make up the 15-level BHMLI.…”

Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter With Output Voltage Regulation Techniques

“…An improvised model was adapted by Parija et al using a dual extractor third order signal integrator. The model was tested on weak grids using the integrated system (WEGS (Wind energy generation system) + PV) with an outlook to enhance the fundamental components of load current and grid voltage by separating them for synchronization with the grid [40]. This technique safeguards the entire system while mitigating various power quality issues like THD (Total Harmonic Distortion) and DC injection.…”

Backstepping control of flying capacitor multilevel inverter‐based active power filter

“…To evaluate the proposed method efficiency, Table 4 shows a performance comparison between the proposed strategy and other strategies recently adopted for APF control [16,17,20,[36][37][38][39]. This comparison was based on inverter flying capacitor voltage ripple rate ΔVc% under ideal and non-ideal grid voltages after SAPF connection, transient regime capacitor voltages overshoot and undershoot and maximal ΔVc%, transient response time Δtset for capacitor voltage rebalancing to reach their references, grid problem number for which robustness has been tested and based on cost and complexity in terms of devices used such as regulators, sensors, and measuring instruments.…”