Neural Network Based Conductance Estimation Control Algorithm for Shunt Compensation

IEEE J. Emerg. Sel. Topics Power Electron.

2017

Self Cite

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.

Section: Introductionmentioning

confidence: 99%

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

Jain

IEEE J. Emerg. Sel. Topics Power Electron.

2017

Self Cite

“…Shunt compensator provides suitable load compensation to prevent distorted currents entering the utility grid. Also, there is an increased interest in the development of advanced and fast digital control algorithms to achieve the desired power quality standards.…”

Section: Introductionmentioning

confidence: 99%

“…Two review papers present different configurations and controllers for shunt compensator. Advanced soft computing controllers based on artificial neural network, fuzzy techniques, adaline, and adaptive neuro fuzzy inference system are interesting but complex. Recently, a number of new controllers based on repetitive computation and updating of weights such as anti Hebbian, least means square–based technique, adaptive notch–based control and recursive techniques, and other signal cancelation techniques have gained immense popularity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design, analysis, and implementation of proportional-resonant filters for shunt compensation

Chittora

Int Trans Electr Energ Syst

2017

Summary Recent technological advances in power electronics has led to a substantial increase in nonlinear loads. This has led to deterioration in quality of power in distribution networks and sparked interest in power quality issues and its solutions. This paper discusses the issue of harmonics, which is a power quality problem: their estimation and subsequent control and mitigation using a shunt compensator. The control of shunt compensator using proportional‐resonant (PR) controllers has been designed and implemented. Literature review presents a wide range of control techniques and proportional‐integral (PI) controllers are the simplest and most commonly used in industries. Recently introduced PR controllers have been presented as an alternative to PI controllers. These controllers are believed to overcome the shortcomings of the conventional PI controller, which include the presence of steady‐state errors and the need for transformation in three‐phase systems using the synchronous dq frame. The added advantages of PR controllers include the possibility of implementation for simultaneous detection and extraction of harmonic components without requiring excessive computational efforts. This paper highlights the application of PR controller for harmonic estimation and their reduction in the utility grid using shunt compensator. Closed loop control using PR controllers as filters has been demonstrated using simulation as well as experimental results. Extensive results are presented for different loading conditions, and they demonstrate the application of PR controllers in grid‐interfaced converter for power quality improvement.

“…A back propagation algorithm based control algorithm for power quality improvement is shown in [7]. A control algorithm which uses neural network based conductance estimation is shown in [8].…”

Section: Introductionmentioning

confidence: 99%

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

Jain

2014 Annual IEEE India Conference (INDICON)

2014

Self Cite

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.