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Nonlinear and unbalanced loads produce power quality pollution to interfaced power systems. Also, photovoltaic systems implementation could worst the situation without proper functioning of active power filters. Now, available active power filters are suffering from to fully suppress interfaced power grid harmonics and distortions under highly unbalanced and nonlinear loads. In this paper, a new approach...
In the operation of grid-connected photovoltaic power stations, a large amount of harmonic current is injected into distribution network, which reduces the power quality of distribution network. In the paper, the Static Var Generator (SVG) is added to the outlet of the photovoltaic power station, by using the feedforward control strategy for the voltage, SVG can effectively suppress the harmonic current...
The output voltage analysis of PWM inverter, from the photovoltaic (PV) power plant, represents the first of the objectives of this research. On the one hand, a real voltage wave is analyzed, taken by oscillography and on the other hand two waveforms are identified, alternative step type, by multiplying and their composing, any form of output voltage can be obtained from PWM inverters. The two signals...
Due to the high-scale penetration of single-phase photovoltaic (PV) systems in distributed generation, a single-stage single-phase grid-connected PV system, with a nonlinear control strategy is presented in this paper. Using the general structure for synchronous dq0 frame, the controller is developed to obtain maximum power from the PV array regardless of the atmospheric conditions without the requirement...
Residential solar photovoltaic (PV) energy is becoming an increasingly important part of the world's renewable energy. A residential solar PV array is usually connected to the distribution grid through a single-phase inverter. Control of the single-phase PV system should maximize the power output from the PV array while ensuring overall system performance, safety, reliability, and controllability...
The photovoltaic grid-connected power system filter interface circuit analysis and optimization design is the important measure to improve the system stability and grid power quality. This paper analyzes the three-phase LCL filter interface circuit model respectively on ABC coordinates and αβ coordinates. The frequency characteristic of L, LC, LCL three kinds of filter carries out comparative analysis...
An isolated grid-connected photovoltaic (PV) power system for household is proposed and the control strategy of the system is presented in this paper. The proposed PV system employs an interleaved boost converter as the first power-processing stage, which can boost a low voltage of PV array up to a high dc-bus voltage. In the traditional isolated PV system, industrial low-frequency transformers are...
According to national standards, large-scale photovoltaic grid-connected inverters must have zero-voltage ride through (ZVRT) capability. This paper presents a ZVRT control strategy based on natural coordinate. Complexity of the control strategy is reduced due to saving phase-locked loop and eliminating coordinate transformation. The ZVRT control of grid-connected photovoltaic inverter under symmetrical...
The main objective of a photovoltaic (PV) inverter is to inject the PV power into the ac-grid. Generally, due to variations in solar irradiance, inverters operate bellow their rated current. Therefore, this current margin can be used to ancillary services, such as harmonic current compensation. However, it is necessary to study the photovoltaic inverters voltage and current capability effects during...
Nowadays, non-linear loads are one of the major issues regarding the system power quality. Additionally, the growing presence of distributed generation (DG) systems, which employs converters to connect power sources to the grid may also affect power quality due to its switching. To better utilize such converters, multifunctional operation is usually employed. In order to reduce the harmonics generated...
The Z-source concept has many advantages it can be applied for any type of power conditioning system this paper propose a Z-source based three level inverter system for the photo-voltaic array or system. A comparison of traditional system and new Z source three level inverter configuration is performed. In this paper present the SPWM technique for controlling the neutral clamped three level inverter...
This paper proposes a photovoltaic (PV) array based cascaded H-bridge multilevel inverter (CHBMLI) working active power filter as a shunt for four wire distribution system. This system is used for the power acclimatizing of distribution network as it is composed of linear, nonlinear and unbalanced loads. Solar Photovoltaic formed isolated source for CHBMLI. This active filter minimize line harmonics,...
Standalone photovoltaic systems is a key technology for the increase of renewable energy sources share in electricity production worldwide. The power quality of those systems plays a fundamental role in avoiding volatile power supply. This calls for a concrete design in order to meet power quality specifications. In this context, a methodology has been developed in a previous work, in order to set...
Delivering quality power is the important issue of grid connected solar photovoltaic (PV) system. The generation of quality power from the proposed system is influenced by the intermittent nature of solar photovoltaic power, power electronic converters used and the nonlinear loads connected to the system. To understand and analyze the system an accurate modeling is required. This paper deals with...
This paper presents a photovoltaic (PV) integrated unified power conditioner (UPC) system that provides power quality enhancement as well as real power sharing. The shunt inverter of the PV integrated UPC system provides compensation for the harmonics present in the source current and reactive power while the series inverter compensates for voltage harmonics, voltage sags and swells. A novel control...
In the area of sustainable development, solar energy has shown significant potential as a renewable energy source and it considered the important one in electricity generation. This paper focuses on power quality improvement in the distribution network using three phases shunt active power filter supplied by photovoltaic system. A new control method used to eliminate harmonic currents caused by the...
solar energy represents a significant potential that has been exploited through various technologies. Photovoltaic energy is an example. It is an attractive solution for the production of electricity. This work describes a photovoltaic generator connected to the grid using passive filter L, LC, LCL, comparing to damping LCL filter with series and parallel resistor. The proposed system compares the...
Distributed PV system, based on repetitive control technology and network inverter control policies on the PV grid system harmonic content of real-time dynamic tracking and suppression. At the same time, the control method is also widely used in large-scale photovoltaic power plants among the network harmonic suppression. However, the majority of the light resource rich regions, using the control...
Renewable Energy Resources (RER) are growing steadily and they are projected to supply all the electricity demand in the future. Currently, wind and solar energy resources have the highest rates of growth, and specifically in the recent years, solar energy has been number one in growth rate among all types of renewable resources. However, dealing with the solar energy's intermittent nature is the...
In this designed system for interfacing the Photovoltaic system to grid at it's maximum power point we used single stage topology which consist a current source inverter along with maximum power point tracking system and double tuned resonant filter. In this system small dc link inductor is connected in series with double tuned resonant filter to eliminate harmonics at dc side of inverter, which increase...
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