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The Study Of P-R And D-Q Transform Control Strategy On Single Phase PV Grid-connected Inverter

Posted on:2016-04-20Degree:MasterType:Thesis
Country:ChinaCandidate:NKUNDAYESU Gloire G RFull Text:PDF
GTID:2272330452965413Subject:Electrical engineering
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This research introduces a DESIGN and CONTROL of a PV-INVERTER Gridconnected System using a PR control strategy and a Single phase D-Q transform.It describes recently introduced proportional-resonant controllers and their suitabilityfor the control of grid-connected converters. The PR control alleviates the shortcomings ofPI controller over grid-connected current; this results in high efficiency of the Voltage loopcontroller (The reference signal to the current loop will be much more accurate).A control strategy of single-phase active power and reactive power using a d-qtransformation is also proposed. This d-q transformation is implemented by usingmathematical principles such as the Hilbert transform,by which the instantaneous single-phase current is converted into complex vectors (analytic signals) on an instantaneous basis.Since the fundamental component of current is converted into DC values, the ProportionalIntegrator Controller will be able to track and eliminate the steady state errorinstantaneously; this will increase the accuracy and efficiency of the digital controller.A single-phase grid-connected inverter using a boost-coupled inductor is proposed forphotovoltaic (PV) generation system and PV grid connected systems to enhance integrationof a single-phase inverter with a photovoltaic panel to form independent embeddedphotovoltaic modules. DC20V to40V is boosted up to DC400V, successfully inverted toAC220V.This will efficiently convert solar energy into electrical energy to comply withthe requirements of the local load, or connect the converted electrical energy into the grid.Simulations were conducted using PSIM software to test the effectiveness of the proposedscheme.Moreover, static or a dynamic power compensator control strategy will be implantedinto the outer loop (Voltage loop) to compensate the reactive power drawn by the EMICapacitor, and this results in a higher power factor (PF) close to a unit. Simulation andExperiment results are provided to verify the validity and feasibility of the proposedscheme.
Keywords/Search Tags:Grid connected inverter, Coupled inductor, Double Closed loop, PR Control, Single-phase DQ transform, Unipolar SPWM, Phase Locked Loop
PDF Full Text Request
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