A Frequency Shifter-Based Simple Control for Solar PV Grid-Interfaced System

IEEE J. Emerg. Sel. Topics Power Electron.

2017

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This paper presents a grid supported solar energy conversion system with an adjustable DC link voltage for CPI (Common Point of Interconnection) voltage variations. A two stage circuit topology is proposed wherein; the first stage is a boost converter which serves for MPP (Maximum Power Point) tracking and the second stage is a grid tied VSC (Voltage Source Converter), which not only feeds extracted solar photovoltaic energy into the three phase distribution system but also serves for harmonics mitigation, reactive power compensation and grid currents balancing.An interweaved DFSOGI (Double Frequency Second Order Generalized Integrator) based control algorithm is proposed for control of this multifunctional VSC which possesses the feature of good steady state performance along with fast dynamic response even under sudden load changes at CPI. Moreover, a feed-forward term for the solar PV contribution is used to enhance the dynamic response for climatic changes and CPI voltage variation. An adjustable DC link voltage structure is used to accommodate CPI voltage variation which helps in reduction of losses in the power circuit. To implement adjustable DC link voltage structure, the reference DC link voltage is adjusted with variation in CPI voltage in real time. A PI (Proportional-Integral) controller is used to regulate DC link voltage to set reference value. A wide range of experimental results are shown to demonstrate the features of proposed system. The THD (Total Harmonics Distortion) of grid current has been found well under IEEE-519 standard even under nonlinear loads at CPI.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Adjustable DC Link Voltage-Based Control of Multifunctional Grid Interfaced Solar PV System

IEEE J. Emerg. Sel. Topics Power Electron.

2017

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“…An ILST based control of dual function single-stage SPV system is shown in [10]. A frequency shifter based control for multifunctional SPV system is shown in [11]. A single phase two-stage SPV system with power quality improvement is presented in [12].…”

Section: Introductionmentioning

confidence: 99%

A SOGI-FLL based control algorithm for single phase grid interfaced multifunctional SPV under non ideal distribution system

2014 Annual IEEE India Conference (INDICON)

2014

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This paper deals with a single phase grid interfaced SPV (Solar Photo Voltaic) system. The proposed multifunctional system also helps in power quality improvement in single phase distribution system. A two stage system is used in the presented work. The first stage is a boost converter, which serves the purpose of MPPT (Maximum Power Point Tracking). The second stage is a VSC (Voltage Source Converter), which performs reactive power compensation, harmonics elimination and feeding solar energy into the grid. A SOGI-FLL (Second Order Generalized Integrator with Frequency Lock Loop) based control algorithm is proposed for control of VSC. A feed forward term for solar contribution is used to improve the dynamic response. A PI controller is used to regulate the DC link voltage to desired value. A wide range of simulation studies are carried out to show all features of proposed system. The system is tested considering realistic non-ideal grid conditions. The performance of proposed system is found satisfactory for wide variation in grid voltage. The THD of grid current is well under IEEE-519 standard.

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An assessment of RAD based control algorithm for single-stage multitasking grid tied SECS

2014 Innovative Applications of Computational Intelligence on Power, Energy and Controls With Their Impact on Humanity (CIPECH)

2014