Backstepping Direct Power Control for Power Quality Enhancement of Grid-connected Photovoltaic System Implemented with PIL Co-simulation Technique (original) (raw)
Related papers
2020
In this paper, a grid connected PV system acting as shunt active power filter for power quality enhancement is presented. Further, a DC-DC boost converter is used to interface the photovoltaic generator with the grid, which provides a continuous power flow from the PV generator into the grid through a Voltage Source Inverter (VSI). Hence, a nonlinear backstepping control method with predictive direct power control for the shunt active power filter side is presented, and a suitable backstepping DC-DC boost converter is also developed, with a view to reduce harmonic currents and insuring reactive power compensation under nonlinear loads variations on the utility grid, and also extracts the maximum amount of power from the photovoltaic generator. Processor in the Loop (PIL) co-simulation results prove the performances efficiency of the implemented control algorithms under a nonlinear load operating condition.
International Journal of Electrical and Computer Engineering (IJECE), 2023
A novel nonlinear backstepping controller based on direct current (DC) link voltage control is proposed in three-phase grid-connected solar photovoltaic (PV) systems to control the active and reactive power flow between the PV system and the grid with improved power quality in terms of pure sinusoidal current injection with lower total harmonic distortion (THD), as well as to ensure unity power factor, or to compensate for reactive power required by the load, i.e., the electrical grid. The output power of the PV array is supplied to the grid through a boost converter with maximum power point tracking (MPPT) control and an inverter. Simulation results of the proposed controller show good robustness under nominal conditions, parameter variations, and load disturbances, which presents the main advantage of this controller as compared to an existing controller. The performance of this work was evaluated using a MATLAB/Simulink environment.
Journal of Engineering Research, 2021
This paper discusses a renewable energy system connected to a dual-function power grid through a shunt active power filter to improve the power quality and inject photovoltaic (PV) energy to the power grid in the presence of nonlinear loads. Disturbance rejection for this electrical network is provided by the proposed direct power control (DPC) command. The DPC strategy combines a fractional order PID controller for the regulation of the DC bus voltage with an intelligent method of tracking the maximum power point articulated on the fuzzy logic, reserved to address dynamic weather conditions. The quality of energy is offered by the improved DPC resides in the elimination of the undesirable harmonics of the source currents. Thus, the studied system operates under a power factor near unity with acceptable harmonic distortion, in agreement with the international standard IEEE-519. The overall control of the presented system is assessed under different states of the power source behavio...
Periodica Polytechnica Electrical Engineering and Computer Science
Power converters play an essential role in Photovoltaic (PV) system to maximize the power transfer to the electrical grid. However, the generated harmonics in the grids due to these power converters and nonlinear loads are considered one of the encountered problems to overcome. This paper presents a decoupled control of PV field real power and reactive power injected to the high voltage network via a PWM inverter by using fuzzy logic controllers. Elsewhere, a procedure based on a coordinated active and LCL filtering is proposed to mitigate the harmonic current introduced by a nonlinear load and the inverter itself in such a way to enhance the power quality injected into the grid. The results obtained in the present study show the good performance of the suggested hybrid filtering approach and demonstrate that almost all harmonics orders of the grid current are well mitigated; the current Total Harmonic Distortion (THD) meets its standard and consequently the power quality is conside...
Grid-connected Photovoltaic Power Systems and Power Quality Improvement Based on Active Power Filter
TELKOMNIKA Indonesian Journal of Electrical Engineering, 2014
This paper presents a Parallel Active Power Filter (PAPF) using Photovoltaic cells Energy to feed linear or nonlinear loads with current perturbations compensation and the excess of the energy is injected into the mains. As a result of using instantaneous p-q theory as a control scheme, the multi-function operation such as harmonic elimination, reactive power control and uninterruptible power supply will be achieved. The system consisting of Photovoltaic cells, connected to a diode rectifier feeding a parallel active power filter is simulated in MATLAB/SIMULINK environment. The simulation results prove the efficiency of using the proposed method for Photovoltaic cells energy injection and power quality improvement in the grid power system.
Power Quality Improvement of Utility Current in Grid Connected Photovoltaic System by Active Filters
This paper presents the grid-tied Solar Photovoltaic generator system supplying to nonlinear loads based Shunt Active Power Filter for reactive power compensation and harmonic mitigation by droop control method. Solar PV system is a promising source of energy with great interest in clean and renewable energy sources. The rising number of power electronics-based equipment is resulting in quality problems of electric power supply. Both high power industrial loads and domestic loads cause many disturbances in the utility side such as harmonics, imbalance, sags, swells, flickers and frequency variation. Power quality problems may arise in the system or may be created by the consumer itself. In this paper, the proposed controller utilizing power references shows some significant improvements in theory and a simple control topology. The PV module is connected to the DC side of Shunt Active Filter through the DC-DC converter. Converter switch is controlled by Perturb & Observe (P&O) Maximum Power Point Tracking (MPPT) algorithm and it eliminates the drawback in the conventional PV system. An emulation using MATLAB Simulink is presented to validate the advantage of the proposed system.
In the modern period, improvement in gridintegrated solar power quality, Photovoltaic generation systems has been a rapidly expanding, and difficult. In the previous few decades, numerous methods for improving power quality have been developed. Reactive Power Compensation Techniques, DSTATCOM, Active filters, Dynamic Voltage Restorer (DVR), and Unified Power Quality Conditioner (UPQC) are some examples of this. In this study, the power quality of a grid-integrated solar Photovoltaic production scheme was improved using SAPF techniques. The Shunt Active power Filter (SAPF) with fuzzy logic and a DC to DC PID controller must be designed in order to progress the value of the power in a solar scheme integrated into the grid.
The present paper suggests a simulation study for a grid connected photovoltaic system, associated to a shunt active power filter (SAPF). On the one hand, to extract the maximum power from the PV generator a fuzzy logic Maximum power taking point (MPPT) is proposed in order to track permanently the optimum point. On the other hand, direct power control (DPC) is used to control the shunt active power filter in order to compensate the undesirable harmonic. The simulation of the system under the Matlab/SimulinkTM environment demonstrates the robustness of the proposed controls that simultaneously guarantee harmonic current compensation, unit power factor operation and injection of solar power to the power grid.
Performance of grid-connected PV system based on SAPF for power quality improvement
2016 International Renewable and Sustainable Energy Conference (IRSEC), 2016
This paper presents the design of a shunt Active Power Filter (SAPF) for grid-connected photovoltaic systems. The proposed system injects PV power into the grid, by feeding the SAPF; to eliminate harmonics currents and compensate reactive power produced by nonlinear loads. To inject the photovoltaic power to the grid we use a boost converter controlled by a Fuzzy logic (FLC) algorithm for maximum power point tracking (MPPT). The SAPF system is based on a two-level voltage source inverter (VSI); P-Q theory algorithm is used for references harmonic currents extraction. The overall system is designed and developed using MATLAB/Simulink software. Simulation results confirm the performance of the grid-connected photovoltaic system based on SAPF. For the MPPT controller, the results show that the proposed FLC algorithm is fast in finding the MPPT than conventional techniques used for MPPT like perturbed and observed (P&O). The simulated compensation system shows its effectiveness such as ...
Periodica Polytechnica Electrical Engineering and Computer Science
This paper deals with the improvement of the energy quality using shunt active power filter. The three-phase grid-connected photovoltaic generator consists in solar panels, a three-phase voltage inverter connected to the grid and a nonlinear load constituted by a diode rectifier bridge supplying a resistive load in series with an inductor. In so doing, three main challenges arise from the application context. First, the harmonic currents and the reactive power must be compensated. The second challenge is the injection of active solar energy into the grid. Third, Maximum Power Point Tracking (MPPT) must be found. This paper proposes a method addressing those challenges. For the first and the second one, direct current and power controls is used. For the third challenge, an algorithm is proposed which take in account the electrical variables and the variation of the solar irradiation. Simulation results of the proposed method are shown. The method is illustrated with two different str...