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This paper proposes a new converter-inverter drive system for photovoltaic water pumping without the use of Battery. The converter is designed to drive a 3 phase drives like PMSM, Induction Motor directly from PV energy. This converter is mainly used for water pumping purposes in areas where electrical power is unavailable. Use of photovoltaic energy is one of the solution for this problem. It proposes...
Photovoltaic (PV) solar farms are being increasingly utilized for producing energy, worldwide. To integrate such solar farms with the grid, a thorough technical study is required in terms of their impact on system voltage, power quality, response to faults and short circuit contributions, etc. These studies require a complete modeling of the PV solar system in an electromagnetic transient software...
Power quality problems such as variation of reactive power consumption and distorted current injection in distributed generation system can be compensated by a single-phase conditioner. The proposed conditioner works in feed forward mode and placed in parallel with the PV-inverters in the distributed generation system. A simple current extraction method is applied and an operating algorithm of the...
In very large scale photovoltaic power plants (VLS-PV), due to partial shading and PV modules mismatching, a single point MPPT is not be efficient for all PV modules. Therefore, distributed maximum power point tracking (DMPPT) can be utilized to increase output power capability by increasing the number of converter/inverter units. In this paper, a simple circuit is introduced to achieve DMPPT. Then,...
A novel and practical multi-loop control strategy for photovoltaic (PV) inverters is presented. In which the double close-loop control structure of digital PID voltage and current instantaneous value is adopted based on the cross feedback decoupling control and load current feed-forward control. In addition, in order to improve accuracy of output voltage, a close loop control structure of the output...
This paper presents the design and analysis of both the active and reactive power control of a single-phase voltage source inverter (VSI) for grid-connected photovoltaic (PV) system. The proposed method is based on vector control of power by decoupling control of the active and reactive current components to feed the active and reactive power to the grid. The aim of this research is to control power...
Small- and large-scale wind and solar photovoltaic (PV) generation systems are interconnecting to the distribution system at a rapid pace. Penetration limits are often imposed due to the impact these additional distributed resource can have on voltage. In order to accommodate high penetration scenarios without impacting power quality or reliability, additional control functions must be utilized. A...
In grid-connected Photovoltaic (PV) applications, DC-links based on large electrolytic capacitors are used to attenuate voltage oscillations caused by the sinusoidal power injection into the grid, where the electrolytic capacitors introduce reliability problems. This paper proposes the unified modeling of the complete PV system in typical grid-connected operation conditions to design control strategies...
In this paper, a hybrid power system based on dc-coupled hybrid PV/Fuel Cell/Battery power system that supports the local grid is presented. Part of the local active and reactive power demand is supplied by the hybrid power system. Consequently, the grid operates at or near unity power factor at the point of common coupling (PCC). First, modeling of system components is presented. Then, an effective...
This paper discussed a new photovoltaic (PV) system topology that uses PV energy in efficient way in order to improve system power output during different operating conditions. The proposed topology provides flexible connection between PV modules to achieve different configurations of PV array. A new switching matrix has been developed to achieve the required configurations. Preliminary simulations...
This paper presents a dynamic modeling study for a ZETA converter working in discontinuous conduction mode (DCM) applied to low power renewable energy sources using the generalized switch averaging technique. The modeling is performed considering only resistive loads. The whole system consists of a ZETA converter, using a sinusoidal pulse width modulation (PWM), associated with a full-bridge (FB)...
This paper presents a grid-connected PV system where the PV source is replaced by a real time emulator. The PV emulator is based on a DC/DC converter controlled by the pole placement technique according to PV current-voltage characteristics. These characteristics are obtained by an analytical model whose parameters are identified on the basis of an actual PV installation. In the proposed plant the...
The increasing utilization of photovoltaic (PV) solar systems in distributed (or dispersed) generation systems imposes new requirements for the operation and management of the distribution grid, especially when high penetration levels are achieved. Under this scenario, the power electronics technology plays a vital role in managing an effective grid integration of the PV system, since it is subject...
This paper proposes a new technique for connecting PV modules with the grid at high efficiency in case of partial shading. Normally many PV modules connected in series with single unit of dc-dc converter which be affected seriously to a partial shading as the controller disconnects the whole string. Here each PV module is connected with a single dc-dc with high voltage gain converter, and then converters...
This paper concentrates on the modeling and control of three-phase stand-alone photovoltaic (PV) generation system. The system is mainly composed of a solar array, dc/dc boost converter, three-phase inverter, system controller, and an output load. Sliding mode controllers are used for boost converter and three-phase inverter to achieve the maximum power output, regulated DC voltage, and the desired...
High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection...
In recent years, the increase of energy demand and the problems of fossil-fuel sources due to their environmental pollution and future shortages, have led to the development of technologies need to use non-polluting alternative energy sources such as solar and wind sources. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a...
The output voltage and current of renewable energy sources such as Photo- voltaic are not controlled. Consequently PV- Grid interface system is employed condition output voltage and current into the grid. This call for efficient and well designed control strategies to ensure reliability, stability and quality power output. This paper proposes nine- level cascaded NPC/H-bridge inverter as the PV- Grid...
This paper presents a stand-alone photovoltaic system with Ni-Mh battery serving as its energy storage element. The proposed system is composed of a boost converter, a bidirectional DC/DC converter and a single-phase DC/AC inverter. The boost converter is used to track the maximum power point of the solar panel whereas the bidirectional DC/DC converter is applied to maintain the DC-link voltage stable...
Photovoltaic power plants pose some challenges when integrated with the power grid. The PV plants always focus on extracting the maximum power from the arrays. This makes the PV system unavailable for helping in regulating the grid frequency as compared to conventional generators. The objective of this paper is to introduce a pseudo power point tracking which provides frequency regulation functionality...
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