The paper has given an overview of different power electronic converters in WTSs with special attention paid to the many possible topologies at low voltage and medium voltage. An important trend is that the technology is moving toward a higher power level. and it is inevitable that it goes for …
Read More »Mean Shift-Based Defect Detection in Multicrystalline Solar Wafer Surfaces
This paper has presented a mean shift-based machine vision method for detecting fingerprint and contamination defects in multicrystalline solar wafers. The defect types involve random gradient directions. whereas the normal grain edges generally present more consistent gradient directions in a small spatial window. The entropy of gradient directions is then …
Read More »A survey of fault diagnosis for onshore grid-connected converter in wind energy conversion systems
The fault diagnosis of wind converter is in continuous development in recent years. It reduces the downtime and maintenance cost of WECS. and improves the system availability and operational safety. This paper has surveyed typical fault modes of the fragile components in wind converter and has provided a comprehensive review …
Read More »Impact of Threading Dislocations on the Design of GaAs and InGaP GaAs Solar Cells on Si Using Finite Element Analysis
We have investigated the impact of TDD on the performance of 1J n+ p GaAs and 2J n+ p InGaP GaAs cells on Si at AM 1.5G spectrum. The analysis indicates that in a 1J GaAs cell on Si with a 2.5-μm-thick GaAs base. an efficiency of greater than 23% …
Read More »Stability Enhancement Of Dfig Wind Turbines By Parameters Tuning Of Shunt Connected Facts Devices Using Itae Index
In this article. our purpose was improving the DFIG stability with tuning of STATCOM control parameters. In order to select the objective function. we proposed a method with the name of integral of time absolute error index or ITAE then optimization process was done by genetic algorithm. Optimization results showed …
Read More »Dynamic Performance Analysis of DFIG based Wind Farm with STATCOM and SVC
The steady state behaviour of an interconnected DFIG based wind farm with STATCOM and SVC is studied and compared for performance evaluation of the two FACTs devices. . A case was developed in which when the load is connected at the point of common coupling there is a voltage dip …
Read More »Doubly Fed Induction Generator for Wind Energy Conversion Systems With Integrated Active Filter Capabilities
The GSC control algorithm of the proposed DFIG has been modified for supplying the harmonics and reactive power of the local loads. In this proposed DFIG. the reactive power for the induction machine has been supplied from the RSC and the load reactive power has been supplied from the GSC. …
Read More »A New Proposal for DFIG Grid-Side Converter as Double-Tuned Hybrid Filter to Improve the Power Quality
In this paper a new topology for wind turbines based on doubly-fed induction generator was proposed. The idea behind that work is use the FACTS features of the WT-DFIG to improve the power quality into the point of common coupling (PCC). Besides the inherent advantages to the active filters. through …
Read More »Theoretical review of series resistance determination methods for solar cells
The present study provides a systematic approach to derive a large collection of methods to determine the series resistance of a solar cell. Representation of the methods in the two-dimensional array presented in Table 1 allows for easy comparison and reveals that many previously published methods are more alike than …
Read More »Fifth harmonic and sag impact on PMSG wind turbines with a balancing new strategy for capacitor voltages
The new formulation for the electrical modeling of the three-level converter combined with the new control strategy reveals the capability in mitigating the unbalancing between the capacitors bank voltages. The THD of the output current with the two-level converter and with the three-level converter have propensity to be decremented with …
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