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This paper is concerned with the management of the large amount of information of large-scale PV systems, a new approach that can monitor the status and detect faults for large-scale PV systems is derived. We first design a new type of photovoltaic (PV) arrays connection, and establish its framework for fault diagnosis. Then , based on the so called "data fusion" technique, we merge the...
DG based on Photovoltaic System Generation (PVS) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with PVS. Firstly, the probabilistic...
Analytic hierarchy process (AHP) was performed on decision-making of PV modules for very large scale photovoltaic systems using sc-Si, mc-Si, a-Si, CdTe and CIS from both economic and environmental viewpoints. The amount of module, land requirement, transportation, array support and foundation varies depending on the type of PV module because of the differences of price and efficiency. In order to...
As the output power of the photovoltaic (PV) cell changes with the insolation , PV cell temperature and cell voltage changing. It is necessary to control the operating point to draw the maximum power of the PV cell in order to increase system efficiency. In this paper, two-level single phase PV grid-connected system is designed, which mainly includes PV cell, BOOST circuit, inverter, filter and the...
Aimed at the shortcomings that traditional fuzzy logic control method for solar LED illumination system maximum power point tracking (MPPT) control system, a novel solar LED illumination control strategy based on variable univers adaptive fuzzy PID controller is proposed.The controller can automatically adjusts the variable univers with the change of photovoltaic output power deviation, to realize...
With the rapid development of economy and society, energy demand of Zhangjiakou City, located in Hebei Province of China, is increasing in an high speed. In 2008, the annual accumulative total capacity of electric power is about 10.6 billion kWh, and the most of them is provided by the fossil fuel resource. Certainly, it is a very inappropriate energy structure, so the sustainable development of city...
In this paper, an adaptive fuzzy MPPT controller is designed with FPGA, the design of fuzzy controller and adaptive control theory is described in detail, and it is discussed that how to implement adaptive fuzzy MPPT control with FPGA, and finally The solar storage control system is built with the controller, the experiment proved that the controller using this method can adjust the parameter according...
The removal of a transformer in grid-connected PV systems can reduce size, weight and costs. When no transformer is used, a galvanic connection between the grid and PV panels exists and leakage current appears due to parasitic capacitance. In this paper, the principle of leakage current is analyzed from equivalent resonant circuit and an equation is derived to evaluate the current. It will be shown...
New energy powers such as wind power and solar power technology taken into the power system increase random fluctuation in the system, and therefore threshold-crossing problem of nodal voltage and load flow are becoming increasingly more significant. Based on semi-invariant and Gram-Charlier series, the paper considers the randomness of the generator and load, nodes relevance, random slip of branches...
In this paper, a new circuit implementation of Carrier Phase Shifting Sinusoidal Pulse Width Modulation(CPS SPWM) for grid connected cascaded multilevel inverter is presented. The SPWM control scheme is realized with only a single Field programmable gate array (FPGA) chip EP1K from ALRERA, Inc. and the programming language is Very High Speed Integrated Circuit Hardware Description Language (VHDL)...
Based on construction of radial basis function network, by studying relationship between materials band gaps and parameters of solar cells, a new solar general simulation model is offered, which can automatically adjust the parameters. The prediction technology is used in photovoltaic power generation system to solve the problem of the lagging battery control, and the stability of photovoltaic power...
Solar energy is rich, ideal for the sustainable use of renewable clean energy, solar photovoltaic system utilizes photovoltaic effect of solar cells and transforms the solar radiation directly into electricity generation. In the world most countries focus on such new power generation form. In recent years China has made great progress in using solar energy and photovoltaic technology. The production...
A better structure is obtained in this paper by design calculations of the single PV/T components, the fin height of the heat collector is between 10 mm~20 mm and fin space between 20~40 mm which makes flow resistance reduced effectively in the heat collector and the heat transfer effect better. A small solar energy photovoltaic and thermal household hybrid system is designed, which is suitable in...
This paper uses the grid-connected photovoltaic (PV) power plant electromechanical transient simulation model on FASTEST (Fast Analysis of Stability using the Extended equal area criterion and Simulation Technologies) to do the simulation of PV power plant integrated to the grid. The simulation includes the largest installed capacity of PV power plant and the response of PV power plant when solar...
Based on conventional hysteresis grid-connected inverter current control, a fuzzy hysteresis band width grid connected current control was presented in this paper, and a whole fuzzy hysteresis band width for PV power grid connected current controller has been designed. Simulations were performed on Matlab/Simulink software, results of simulations show that the proposed control algorithm have smaller...
This paper presents a feasibility study of photovoltaic (PV), wind, biomass and battery storage based hybrid renewable energy (HRE) system providing electricity to residential area in Australia. The system with load of 200 kWh · day-1 is analyzed through the environmental and economic aspects. The study computes the net present cost (NPC, $), cost of energy (COE, $ · KWh-1) and the emissions (kg ·...
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...
A novel current control method based on improved repetitive control (RC) and fuzzy reasoning immune feedback for single-stage single-phase grid-connected (SSSPGC) photovoltaic (PV) system is proposed. Low-pass filter with zero-phase-shift is employed for delay part of RC to make better tradeoff between robustness and performance. Then the compensation part based on linear lead compensation function...
For more transformation efficiency, a kind of design method for sun tracker is presented. Using simplified circuit, the tracker can follow the round of sun, which can keep the surface of the solar battery perpendicular to the ray of the sun to obtain the greatest area of light as possible. Also, some parameters, such as local latitude, local time etc. are needed to input by operators. The results...
This paper describes this development of a test platform of a grid-connection PV station. Essentially this entire platform involves the integration of a Personal computer (PC), a Dc power source, a power analyzer, an AC load and an analog grid to create a grid-connection PV system and to test. This new system boasts of high accuracy measurements coupled with the commercial viability of low cost. In...
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