Experimental Investigation of Harmonics in a Grid-Tied Solar Photovoltaic System (original) (raw)
Related papers
2017
The power quality issues in the grid tied solar photovoltaic system are important to address to know about the actual power production and consumption in the existing system. This paper investigates the presence of voltage and current harmonics due to the linear, nonlinear loads and the reactive power transferred between plant, grid and load. The digital power analyzers are kept in the system to know the amount of power import and export between the plant and grid, so as to serve the load. In order to control the effect of harmonics a compensator in incorporated in the phase locked loop of the inverter as well as a power quality conditioner is connected at the point of common coupling. It has been found that by switching the conditioner unit, the quality of power and power factor of the system gets improved and it also reduces the export of reactive power to the load so as to obtain the reliable and efficient operation of the grid tied solar photovoltaic system.
Study and analysis of the propagation of harmonics in electrical grid connected photovoltaic system
Diagnostyka
Renewable energy sources especially solar energy connected to an electrical grid system by using power electronic devices, known that devices degrade the power quality and especially generate harmonic currents. This article presents the study investigation and propagation of harmonics in the integration system of an electric grid connected to the photovoltaic system in the presence or not of a non-linear load (polluting load). In this study, the perturb and observe type MPPT controller for the boost converter and the PWM control for the three-phase inverter which provides the connection are used. We use a passive filtering technique (single and multiple filters) to mitigate the harmonic currents generated by the non-linear load. In the first case where the integration system is alone, the results obtained show that the values of the total harmonic distortion (THD) rates are within the standard used. But in the case of the presence of the non-linear load, the THD values are higher than the used norm. After using our proposed technique, the values of THD obtained are in the norm used for the application of a tuned filter at the fifth harmonic, and better results find with using of multiple filters (fifth and seventh).
Control of Harmonics and Performance Analysisof a Grid Connected Photovoltaic System
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2013
World energy consumption is increasing substantially .Growing scarcity and rising prices of fossil fuels may lead to economic instability. Continuously increasing energy consumption will overloads the distribution grids as well as the power stations, therefore having a negative impact on power availability, security and quality. One of the solutions for overcoming this is use of renewable energy resources. The energy generation from PV based DG is highly intermittent in nature and shows wide variation because of continuous fluctuations in solar radiation intensity, temperature and unpredictable weather conditions (e.g. clouds, snow, wind, etc.). This poses a major challenge for the designers of grid connected PV systems for DG applications. One of the major problems is the increase in the Total Harmonic Distortion (THD) of current injected into the grid. In this thesis basic theory of grid connected photovoltaic system and proposes a new scheme for Total Harmonic Distortion (THD) im...
A Grid-Tied Solar Power System with Harmonic Filter to Enhance Power Quality
IRJET, 2022
This paper examines two performance analyzes Stage photovoltaic (PV) system integrated with shunt Active harmonic filter (SAHF). In the recent industrial revolution Distributed generation systems are affected by current harmonics Problems due to the widespread use of non-linear loads. The shunt Active harmonic filter system has harmonic relaxation, power factor correction, and load balancing. shunt Active harmonic filter system 3 leg voltage source converter and extracted DC current From the PV module. In this two-layer system, the first layer is Maximum mounted DC-DC boost converter Maximum power point tracking (MPPT) algorithm. To extract the maximum performance P & O algorithm is used. Extraction Reference current is obtained by PI controller and hysteresis A current regulator is used to control the PWM-VSI. Predict PV-based SAHF is implemented under the load of a diode rectifier Attenuates harmonics and reactive power
Energies
Renewable penetration, particularly the increasing deployment of PV by residential customers, organizations, and utilities, is leading to the rapid evolution of the power grid. However, the power system’s architectural changes affect the quality of supply and give rise to power quality issues such as harmonics, fluctuations, disturbances, etc., at the point of common coupling (PCC). Therefore, in this work, a power network was modeled to study the impact of PV systems on PCC. At first, a detailed review is presented for on-grid PV systems with different inverter topologies, control techniques, sources of harmonic generation, and their mitigation strategies. After that, several use cases considering various sources of harmonics in a network with on-grid PV are modeled and simulated using MATLAB/Simulink. In-depth research was performed in this work to examine the many variables that affect harmonics, such as solar radiation levels, controller tuning, and load changes. Results with a ...
Harmonics control and performance analysis of a grid connected photovoltaic system
2013 International Conference on Advanced Computing and Communication Systems, 2013
World energy consumption is increasing substantially .Growing scarcity and rising prices of fossil fuels may lead to economic instability. Continuously increasing energy consumption will overloads the distribution grids as well as the power stations, therefore having a negative impact on power availability, security and quality. One of the solutions for overcoming this is use of renewable energy resources. The energy generation from PV based DG is highly intermittent in nature and shows wide variation because of continuous fluctuations in solar radiation intensity, temperature and unpredictable weather conditions (e.g. clouds, snow, wind, etc.). This poses a major challenge for the designers of grid connected PV systems for DG applications. One of the major problems is the increase in the Total Harmonic Distortion (THD) of current injected into the grid. In this thesis basic theory of grid connected photovoltaic system and proposes a new scheme for Total Harmonic Distortion (THD) improvement in grid connected Photovoltaic (PV) systems. A fuzzy logic control can be used to improve the THD in grid connected PV systems. A comparison of PI, hysteresis control and fuzzy logic control gives the feasibility of the method. Thus the proposed scheme ensures that the THD in the injected grid current remains within the limits specified by IEEE-519, IEEE-1547. Simulation results are given to show the overall system performance. Evaluation and analysis of the 100 kW grid-connected PV system in AJCE were done depending on the change of the weather condition. The system performance was also quantified using several quantities which describe both PV array performance and the overall system performance.
Voltage Control and Harmonics Investigation on Loads Supplied by Off-Grid Solar Power Plant
Conference: 14th International Conference on Thermal Engineering: Theory and Applications, May 25-27, 2023 : Yalova, Republic of TurkiyeAt: Yalova, 2023
In this research, voltage control and harmonics reduction on loads supplied from an off-grid solar power plant are addressed. After converting the solar voltage from direct current to alternating current, the voltage on the load was tried to be kept constant at 380V/50Hz. The 2-level inverter used here is controlled through 2DOFPI and the switching signals required for Pulse Width Modulation (PWM) are produced. Meanwhile, the harmonics on the voltage were attempted to be limited to below 5% in accordance with international standards. Thus, clean energy was tried to be supplied by setting the load voltage and harmonics. The system consists of solar panels, filters, an inverter, an inverter control unit, loads, and measurement elements. To model the environment, the sunlight level was altered continuously. The temperature was maintained constant at 250. The simulation study was executed in Matlab/Simulink environment.
Analysis of harmonics currents in the case of grid connected photovoltaic generator
International Journal of Power Electronics and Drive Systems(IJPEDS), 2023
Nowadays, electrical grid experiences an increase in penetration of single-phase PV generations. Then, it becomes necessary to control this penetration by techniques of synchronization in order to provide electrical energy of good quality to the network. Estimation of the frequency, phase and magnitude of the grid voltage are necessary to correctly synchronizing the PV generator with grid. Connecting a direct current generator to grid via an inverter, requires to fix the performances to improve in the inverter to choose the best-suited topology. This paper describes the control of a non-isolated single-stage single-phase grid-connected inverter fed by a photovoltaic source. In order to define the influence of the three parameters: modulation index, switching frequency and phase shift angle, it is interesting to know the behavior of the system when one of these parameters moves away from its optimal value. Optimal values make it possible to obtain a THD as small as possible to satisfy the international standard. In this work, modulation index and switching frequency are set to their respective optimal values. To study grid current and inverter currents before and after filtering, harmonic analysis is performed for seven shift angles for the same switching frequency (10000 Hz) and modulation index (2.2).
Experimental Study on Harmonic Mitigation in a Grid Connected Solar Power Plant
IJERT-International Journal of Engineering Research & Technology, 2021
Solar energy is converted into electrical energy through the use of solar power plants. Solar power plants have a photovoltaic array, a maximum power point monitoring unit, a DC to DC converter and, typically, a multi-level inverter. In these types of devices, power filters are used to counteract harmonics. The trouble with active power is that it adds expense to an otherwise costly solar power plant.