This article investigates the power quality enhancement of a grid-tied photovoltaic (PV) distribution system by employing a fuzzy logic proportional–integrator–derivative multiple complex coefficient filter multiple second-order generalized integrator frequency-locked loop (FLPID-MCCF-MSOGI-FLL) hybrid control scheme based shunt active power filter. The MSOGI-FLL reference current generation strategy is implemented to mitigate the current harmonics by extracting the fundamental constituents (FCs) from the nonlinear load currents, whereas an MCCF is employed to separate the FC from the distorted grid voltages and eliminates the voltage harmonics during extremely polluted grid voltage condition. The main objective of using FLPID is to maintain the stable power between dc and ac sides by regulating the dc-link voltage constant under transient conditions. To track the maximum power from the PV panel under varying environmental condition, the particle swarm optimization based perturb and observe technique is used in this article. The comparative analysis is analyzed to check the effectiveness of the proposed hybrid control scheme with existing and adaptive control techniques in respect of power quality, better dc offset rejection, better FC and frequency extraction, and grid synchronization. The system with the proposed control scheme is simulated on MATLAB/Simulink and validated in a real-time field-programmable gate array platform under different test scenarios. In conclusion, the harmonic content of grid currents and voltages is found well within the IEEE-519 standard limits.

An Improved Adaptive Control Strategy in Grid-Tied PV System With Active Power Filter for Power Quality Enhancement

Integration of solar photovoltaic plants into the distribution systems using various power processing units produces the harmonics that may cause malfunctioning of sensitive equipment connected to the point of common coupling. To overcome this drawback, a novel adaptive current regulator is employed for the grid interfacing voltage source inverter. In addition, a high-gain dc–dc converter with a Kalman-based maximum power point tracking algorithm is designed to achieve the high voltage level at the common dc bus. To determine three-phase reference currents, the proposed adaptive current regulator is designed by using a recurrent neural network trained with the Hebbian least mean square weight updating algorithm. They are used to generate the three-phase compensating currents for suppressing the harmonics present in the system. The proposed method has several merits, such as better harmonic mitigation ability, adaptive behavior, improved stability, and lesser settling time, as compared with the conventional PI controller. The system performance with the proposed current control regulator is analyzed via MATLAB/Simulink. Comparative analysis via simulation platform assures the improved performance in terms of power quality, settling time, and stability of the proposed controller. Also, the effectiveness of the proposed controller is validated under several transient conditions by developing a laboratory scale prototype model with the dSPACE control desk.

Improved Power Quality in a Solar PV Plant Integrated Utility Grid by Employing a Novel Adaptive Current Regulator

A modified energy management scheme to support phase balancing in grid interfaced photovoltaic/fuel cell system

Design, operation and control of a vast DC microgrid for integration of renewable energy sources

In this article, a modified reduced order generalized integrator-based frequency-locked loop (MROGI-FLL) is proposed for controlling the interfacing inverter of the grid-tied photovoltaic system to mitigate the harmonics. Additionally, a fuzzy tuned PID controller is integrated in the proposed scheme to minimize the steady-state error, which results the voltage level is maintained constant at the common dc-link bus terminals. The MROGI-FLL is designed to evaluate the three-phase reference currents by extracting the fundamental constituents from the load currents and grid voltages. The proposed MROGI-FLL has several advantages such as better harmonic mitigation capability, control adaptivity, adaptive frequency and phase, grid synchronization, and low computation burden. The proposed reference current generator is simulated on MATLAB/Simulink platform under steady state and various transient conditions.The comparative study of proposed scheme is compared with the existing and adaptive control techniques, which assures the potency of the proposed control algorithm in-terms of harmonic mitigation, dc-offset rejection, frequency variation, and computation burden. Finally, the experimental results are verified through an experimental platform by using the dSPACE evaluation kit and both the simulation and hardware characteristics are well justified to the IEEE-519 standard limits.

A Novel Modified Control Scheme in Grid-Tied Photovoltaic System for Power Quality Enhancement

An optimal current control scheme in grid‐tied hybrid energy system with active power filter for harmonic mitigation

Now a days with elevation of Technology, electrical power requirement is grow exponentially rate. So many instruments require quality power for their operation run continuously. The consumer appliances are demand for quality power. But due to some inner components and outer components the quality power distribution is pretentious to consumer's side. Difference in current, voltage and frequency quality of power problem soccurs in power system network. The Power electronic converters are the main cause for power quality issues, because of their high switching characteristics. So to reduce the harmonics feeded by the nonlinear load, the filters are mostly used devices particularly shunt Hybrid active power filter (HAPF) are for quality of power improvement. In this paper described the HAPF i.e shunt passive filter in series with active power filter are implemented, and two different compensation techniques are implemented. Fryze, IRP theories with different filtering techniques and different loading conditions. And PI controller are used for feedback mechanism to calculate the Plossi.e filter inverter switching losses and hysteresis current control technique is used to generate PWM pulses gives to APF inverter. Modeling, analysis and comparative study of two different compensation techniques is described in detail. Simulation is carried out using MATLAB/SIMULINK for different compensation techniques and different filtering conditions and the THD values are tabulated.

Narendra Babu P

Papers

An Improved Adaptive Control Strategy in Grid-Tied PV System With Active Power Filter for Power Quality Enhancement

Improved Power Quality in a Solar PV Plant Integrated Utility Grid by Employing a Novel Adaptive Current Regulator

A Novel Modified Control Scheme in Grid-Tied Photovoltaic System for Power Quality Enhancement

An optimal current control scheme in grid‐tied hybrid energy system with active power filter for harmonic mitigation

Comparative analysis of a Hybrid active power filter for power quality improvement using different compensation techniques