Abstract
The Photo-voltaic (PV) tied Z-source Neutral-point clamped multilevel inverter (Z-NPC-MLI) is used in solar grid connected applications due to its single stage conversion and better performance. Though the Z source inverters adaptation is accepted in grid connected technology, the need for suitable controller and PWM scheme are necessary to meet out the performance such as shoot through switching, neutral point balancing, and harmonic reduction. The space vector pulse width modulation (SVPWM) strategy is a prominent modulation technique for Z-source NPC-MLIs due to the flexibility to select the appropriate voltage vector. Previous publications have shown the control of a Z-source MLI using the SVPWM with and without modification of shoot through switching. However, the current controller (CC) based SVPWM is not matured, which is the most essential consideration for the grid connected inverter to provide neutral point balancing, shoot through control for low harmonic distortion and a high quality current. With all these aims, this paper presents a PV tied Z-NPC-MLI grid connected system with a unique hysteresis current control SVPWM (HSVM) strategy with neutral point (NP) balancing control and direct current control in the inverter input side. Also, the proposed HSVM is assuring the grid connection with high quality voltage and current waveforms. This CC based SVPWM for Z-NPC MLI has been validated through simulation and FPGA based experimental investigations. The results are confirmed the feasibility and reliability of the proposed HSVM for the PV tie grid connected Z- Source NPC-MLI.
Highlights
Renewable resource (RER) is inevitable in the present power generation system (PGS) era which recently witnessed an exponential growth worldwide, and is expected to continue in the same direction
In addition the results have shown the uniqueness of the proposed current controller involvement with space vector pulse width modulation (SVPWM) for improving the inverter performance
Further developed the PV tied grid connected system with hysteresis current control combined Z source SVPWM is known as hysteresis current control SVPWM (HSVM) is developed
Summary
Renewable resource (RER) is inevitable in the present power generation system (PGS) era which recently witnessed an exponential growth worldwide, and is expected to continue in the same direction. Very few attempts have been made on SVPWM based HCC [22], [23] These methods are involving difficult mathematical operation to locate the active switching vector and the capacitor balancing is very hard to attain. SVPWM and carrier level-shifted based control, which are not discussed about the current control With this motivation, this paper suggests the three-phase three-level PV connected Z source-MLI for the utility grid. Z-SOURCE NPC-MLI TOPOLOGY The Z-source concept applied to MLI gives more advantages like suppression the voltage ripples, flexible shoot through state and neutral point balancing This session describes the Z-NPC-MLI power circuit, its operation and the design of Z Network components along with analysis of topology. Since the top-ST(TST) and bottom-ST(BST) has an individual control on the L1 and L2 charging characteristics, the combination of TST and BST maintains the inductors charging in parallel, which ensures the better quality output waveform [8], [13]
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