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This paper presents a Matlab/Simulink model of a 300 KW grid connected photovoltaic (PV) system. The system includes a 300 KW PV array, a maximum power point tracking boost converter using perturbation and observation (P&O) method and a grid connected inverter with its control system. An L-filter is designed to smoothly connect the inverter to the utility grid. The boost converter controlled by...
This paper proposes a solution to voltage rise and/or sag in single-phase unbalanced distribution systems using photovoltaic (PV) arrays with reactive power capability. The PV is controlled to inject maximum power using Maximum Power Point Tracker (MPPT) to supply local loads when the solar power is available. The reactive power capability of the PV inverters regulates the bus voltages in transient...
This review paper represents the modeling design and controlling function of solar Photovoltaic (PV) gridconnected systems from various sources available through literature. The converter system is composed of an isolated DC-DC converter and a three phase DC to AC Voltage Source Inverter (VSI). This type of converters is designed to obtain small signal transfer function which is used to design of...
A Hybrid Modular Multilevel Converter (H-MMC) for grid-connected Photo-Voltaic (PV) system is presented in this paper. The array of PV-panels is connected in each sub-module of the converter. The sub-modules are connected in series to form the dc-link for each phase. The dc-link voltage is unipolar and multilevel in nature which is converted to ac voltage by a low frequency converter (LFC). This topology...
This paper proposes Z (Impedance)-source inverter for single phase grid connected photovoltaic system. Unlike traditional voltage source inverter, Z-source inverter uses shoot-through (ST) duty cycle and modulation index to control output voltage. By modifying the traditional pulse width modulation (PWM) techniques, shoot through duty is accommodated to buck or boost the input voltage. Z-source network...
Increase of load and demand factor on power grids has made supply of electric power to rural areas as a big challenge. The idea of increasing the number of power plants could not be much efficient because it increases the emission of carbon and production cost. Hence use of renewable power sources seems to be much more efficient. The main motive of this proposed work is an efficient design of solar...
The renewable energy based DG system is acquiring more attention towards the power industries due to their abundant availability which is cost free and eco-friendly, they are intermittent in nature too, hence the power prediction from one source is dependent. Thus, a hybrid DG system involving wind and solar energies can increase the power prediction over an individual. This paper presents, the DC...
This paper presents a single phase cascaded multilevel inverter for solar PV (SPV) grid interfaced systems. The proposed inverter consists of two H-bridge voltage source inverters (VSC) connected in cascade and are fed by a single solar photovoltaic array. Both the H-bridge VSC are connected to cascaded transformers, secondary windings of which are in ternary ratio such that 9 voltage levels are achieved...
Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of the PV array output power which depends on solar irradiation and cell temperature. This paper proposes simulation and hardware of a grid connected photovoltaic system which is interfaced with the power system network through a DC-DC boost converter. The maximum power point tracking...
We are considering the problem of controlling single-phase grid connected photovoltaic system based on a half bridge inverter. The control objectives are threefold: i) Maximum power point tracking (MPPT) of PV system. ii) Unity power factor in the grid. iii) Regulating the output voltage to a desired reference value. The considered problem is dealt with by designing a nonlinear controller using the...
this paper presents the simulation, design and the test of a single phase and thermoelectric cooling micro inverter using a DC/DC interleaved isolated boost. It focuses on the optimization of (DC/DC and DC/AC) converters performances and its physical dimensions, and presents an efficient method to track the maximum power point and the load regulation. For this purpose, a specific architecture and...
Power output from the PV arrays are directly proportional to the sun's radiation occurring on its surface area. Partial shading on the PV arrays reduces the power output and produces multiple peaks on the P-V characteristics. The power losses caused by partial shading depend on its pattern and array configuration but does not depend on the shaded area. A Maximum Power Point Tracking (MPPT) method...
The multi-megawatt grid connected photovoltaic (PV) system studied in the paper includes parallel arrays and power electronic units, each with their own DC-DC and DC-AC converters. In one configuration, the DC-AC converters of adjacent parallel sections are connected in cascade, in order to effectively operate as a multilevel inverter, thereby reducing the filtering requirements. Grid voltage oriented...
In the near future solar energy will be the primary energy source. More than 45% of required energy in the world will be generated by photovoltaic arrays. Therefore it is imperative to have focus on reduction of costs as well as on enhancing the efficiency of PV array. In order to carry out the latter part, Maximum Power Point Tracking Technique (MPPT) is used to improve the power output from solar...
This paper presents a single-phase seven levels cascaded and asymmetric-bridge inverter for grid-connected photovoltaic system with non-linear power load. The asymmetric cascaded H-bridge inverter appears to be the perfect candidate for photovoltaic applications; thanks to its modularity, scalability and distributed maximum power point tracking possibility. However the power mismatch from cascaded...
Presently, the concept of renewable energy is gaining ground, because power, and especially electrical power or electrical applications, are tending towards renewable sources, and as a consequence the use of renewable energy increased over the past years. This paper presents a review of multiport converters, different multiport converters are to be discussed, and a comparison between a transformer...
This paper presents a comparative study of conventional and improved incremental conductance (IC) algorithm. In this study the performance of PV system is investigated by using the existing and proposed IC algorithm. The output voltage and the power is calculated in both the cases, these algorithms are implemented to drive the semiconductor switch of the boost converter further for the boost converter...
Wind turbine generator module is the widely used system. Small wind generated powers are cascaded and connected to the grid with a constant AC supply. Wind turbine which gets subjected to various speeds of wind cannot supply a constant DC voltage. A traditional method to avoid this problem is to control either of active or reactive power to control this voltage. This paper concentrates on the control...
This work deals with a single phase single stage multifunctional grid interfaced solar photovoltaic (SPV) system. The single stage topology utilized in the grid connected PV system has the advantages of high efficiency and low cost compared with the two stage topology the primary function of the grid connected inverter in a single stage SPV system is to supply active power into load and grid. The...
This paper presents a Solid State Transformer (SST) interface for grid connected Photovoltaic (PV) system. A new method is proposed for Maximum Power Point Tracking (MPPT) through a single phase inverter with phase displacement control. The inverter control variable is redefined such that it can be used for MPPT. Due to this control technique one converter stage for power tracking is eliminated, leading...
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