serial-14.zip - maximum-power-pointtracking
(MPPT) method focused on low-power (< 1 W) photovoltaic
(PV) panels. The static and dynamic performance is
theoretically analyzed, and design criteria are provided. A prototype
was implemented with a 500-mW PV panel, a commercial
boost converter, and low-power components for the MPPT
controller. Laboratory measurements were performed to assess
the effectiveness of the proposed method. Tracking efficiency was
higher than 99.6 . The overall efficiency was higher than 92 for
a PV panel power higher than 100 mW. This is, in part, feasible
due to the low power consumption of the MPPT controller, which
was kept lower than 350 μW. The time response of the tracking
circuit was tested to be around 1 s. Field measurements showed
energy gains higher than 10.3 with respect to a direct-coupled
solution for an ambient temperature of 26 ◦ C. Higher gains are
expected for lower temperatures.,2015-09-05 10:06:19,下载4次
serial-11.zip - It is well known that in a photovoltaic (PV) plant,
the modules are connected to switch-mode power converters to
enhance the power output in every environmental condition. This
task is performed by the maximum power point tracker (MPPT),
which provides a current or voltage reference to the converter.
Traditional perturb and observe or incremental conductance
algorithms are not efficient in rapidly changing conditions,
whereas a model-based (MB) MPPT offers a better dynamic
performance. Because it is relatively easy to obtain an accurate
model of a single PV panel, thus predicting the maximum power
point voltage for given environmental conditions, MB MPPTs
seemed to be attractive for employing in module integrated
converters,2015-09-05 10:03:50,下载5次
serial-8.zip - simulation and hardware implementation
of incremental conductance (IncCond) maximum
power point tracking (MPPT) used in solar array power systems
with direct control method. The main difference of the proposed
system to existing MPPT systems includes elimination of the
proportional–integral control loop and investigation of the effect of
simplifying the control circuit. Contributions are made in several
aspects of the whole system, including converter design, system
simulation, controller programming, and experimental setup. The
resultant system is capable of tracking MPPs accurately and
rapidly without steady-state oscillation, and also, its dynamic performance
is satisfactory. The IncCond algorithm is used to track
MPPs because it performs precise control under rapidly changing
atmospheric conditions. MATLAB and Simulink were employed
for simulation studies, and Code Composer Studio v3.1 was used
to program a TMS320F2812 digital signal processor. The p,2015-09-05 10:02:34,下载12次
serial-5.zip - An efficient, cost-effective maximum power point
tracking (MPPT) algorithm is required to improve the energy
utilization efficiency of low power photovoltaic (PV) systems. This
paper presents an experimental uation of the incremental
conductance MPPT algorithm when employed by a standalone
PV pumping system, using an experimental installation comprised
of a 1080-Wp photovoltaic array connected to a 1-kW permanent
magnet dc motor-centrifugal pump set. Particular focus is given
to the uation of the two commonly utilized implementation
techniques: reference voltage perturbation and direct duty ratio
perturbation. The influence of algorithm parameters on system
behavior is investigated and the energy utilization efficiency is
calculated for different weather conditions. The performance of
the incremental conductance algorithm is compared to that of
the commonly used perturb and observe MPPT algorithm and
the various advantages and drawbacks of each technique are,2015-09-05 10:01:33,下载26次
serial-2.zip - Under partially shaded conditions, series connection
of photovoltaic (PV)modules results in the flow of lowest current in
the string corresponding to the most shaded module, reducing the
overall power output. Power output can be maximized by incorporating
module-level “distributed” maximum power point tracking
(DMPPT) wherein the current of each module is compensated
by regulating its voltage at the respective maximum power point
(MPP) value by connecting a dc–dc converter in parallel. Existing
current compensation schemes are either too complex or inaccurate.
This paper proposes a novel DMPPT scheme using current
compensation, which is simple to implement and yet provides an
accurate compensation, resulting in exact maximum power point
tracking (MPPT). In the proposed scheme, each PV module is
resonated through a special arrangement in the shunt-connected,2015-09-05 09:59:55,下载12次
serial-1.zip - The flexible photovoltaic (PV) modules have the advantage
of easily fitting on curved surfaces, but in that case their
power–voltage characteristic exhibits localmaximum power points
(MPPs) where the PV module power production is suboptimal.
In this paper, the effect of geometrical installation parameters of
flexible PV modules, such as the bending angle, tilt angle, and
orientation, on the shape of the power–voltage characteristic is
experimentally investigated. Then, a new method of tracking the
global MPP of flexible PV modules is proposed. An experimental,
comparative study is also presented, which demonstrates that compared
to the past-proposed MPP tracking (MPPT) techniques, the
system proposed in this paper is capable to detect the global MPP
of a flexible PV module with less search steps. Thus, the power
loss during the global MPPT process is minimized and the energy
production of the flexible PV module is maximized.,2015-09-05 09:57:16,下载3次
Unit1-VH.zip - 1. A 5 MVA, 10 kV, 1500 rpm, 3 phase, 50 Hz, 4 pole, star connected alternator is operating on infinite bus bars. Determine the synchronizing power per mechanical degree of displacement under no-load condition. Xs = 20 .,2015-08-16 13:53:53,下载3次
ee2302-qb.zip - 1. A 5 MVA, 10 kV, 1500 rpm, 3 phase, 50 Hz, 4 pole, star connected alternator is operating on infinite bus bars. Determine the synchronizing power per mechanical degree of displacement under no-load condition. Xs = 20 .,2015-08-16 13:49:44,下载3次
Short-questions-and-answers-Electrical-Machines-I - Steam turbines are found to operate at fairly good efficiency only at high speeds. The high speed operation of rotors tends to increase mechanical losses and so the rotors should have a smooth external surface. Hence, smooth cylindrical type rotors with less diameter and large axial length are used for Synchronous generators driven by steam turbines with either 2 or 4 poles.,2015-08-16 13:48:31,下载3次
ELECTRICAL_MACHINES_II.zip - Steam turbines are found to operate at fairly good efficiency only at high speeds. The high speed operation of rotors tends to increase mechanical losses and so the rotors should have a smooth external surface. Hence, smooth cylindrical type rotors with less diameter and large axial length are used for Synchronous generators driven by steam turbines with either 2 or 4 poles.,2015-08-16 13:47:37,下载3次
Grid-Connected-Photovoltaic.zip - “Grid Connected
PV Systems with Smart grid functionality”. It solves the problem of shading to the available
NTNU PV modules which is sensitive to the exiting central inverter system topology by
proposing a PV system which is more efficient and reliable. This thesis is focused on the
design of the PV-grid connected inverter power stage that supports the proposed PV system
under study. As part of the NTNU renewable energy laboratory project, a single phase 1kW,
230V, dual power stage inverter is designed. The important parameters required for inverter
stage including input inductance and capacitance, DC –Link capacitance and LCL filter were
designed.,2015-08-16 13:38:57,下载32次
trivector.zip - The basic difference between a Trivector meter and multi function meter is that a Trivector meter cannot display the tariff it can display kWh and that reading the tariff and cost has to be calculated manually, where as a multi function meter can display tariff also if programmed properly. Different tariff at different interval of time for normal and peak time load and also different tariff at same time by two different display is possible in multi function meter.,2015-08-02 13:49:14,下载1次
A-comparison-between-Sepic-and-Buck-ieee-sreeku2. - This paper aims to study of change in efficiency, output voltage of INR MPPT Technique while connected to different converters such as Cuk and Sepic. These converters have advantages and disadvantages that will be pointed in this paper. Simulations results are analyzed and compared, afterwards conclusions are drawn. Works are carried out in Matlab platform.,2015-08-02 13:37:10,下载16次
tese_ee04186_final_v1.zip - This report is about the development of efficient electric power conversion solutions for
photovoltaic panels. Different solutions are presented and an overall perspective is shown.
From the characteristics of the photovoltaic panels to the power grid all aspects are
mentioned briefly. A three state commutation cell topology is chosen for a more detailed
analysis, simulation is made and a prototype is built. Several tests reveal the characteristics
of the chosen topology. Propose of this report is to introduce the necessary knowledge for
further investigation of the three state commutation cell as well as its control by MPPT,2015-08-02 12:50:19,下载2次