The effects of partial shading on Long string. Parallel strings. and Multi-string PV power generators have been investigated by using an experimentally verified simulation model based on the well-known one-diode model of a PV cell. Partial shading was varied with respect to system shading and shading strength. which represent the …
Read More »Frequency regulation in hybrid power systems using particle swarm optimization and linear matrix inequalities based robust controller design
In this paper. the LFC problem was presented using several control algorithms for the power system consisting of different energy sources. The new contribution of this research was the successful simulation of the proposed PSOLMI controller. demonstrating superior performance as compared to other controllers. The results illustrated superior control effort …
Read More »Optimum design of low-voltage distributed photovoltaic systems oriented to enhanced fault ride through capability
In this paper. the design aspects of low-voltage DG-PV units were investigated in order to comply with LVRTC requirements. The theoretical analysis revealed how the impedance of the DG units affects the bus voltages of the distribution network after a fault occurrence. Moreover. the concept of voltage selectivity is defined. …
Read More »Properties of Cu(In.Ga)Se2 solar cells with new record efficiencies up to 21.7%
The properties of the most recent CIGS solar cells with conversion efficiencies up to 21.7% show a remarkable increase in Jsc. a high Voc level and improved FF when compared to former record results. The significant increase in Jsc can be explained by an optical gain through a thinner CdS …
Read More »Control of a wind energy conversion system equipped by a DFIG for active power generation and power quality improvement
In this paper. a novel approach has been proposed to manage and improve the quality of the grid power using a WECS equipped by a DFIG. The RSC is controlled in such a way to manage between production of maximum active power and power quality improvement without any over-rating. The …
Read More »Grid Interconnection of Renewable Energy Sources at the Distribution Level With Power-Quality Improvement Features
This paper has presented a novel control of an existing gridinterfacing inverter to improve the quality of power at PCC for a 3-phase 4-wire DG system. It has been shown that the grid-interfacing inverter can be effectively utilized for power conditioning without affecting its normal operation of real power transfer. …
Read More »Aggregated Wind Park Models for Analyzing Power System Dynamics
Fixed speed and variable speed wind generator models for power system dynamics and transient stability analysis were presented. The models are valid for the simulation of system faults and power fluctuations resulting from wind-turbulence. For estimating wind-turbulence in wind farms a stochastic turbulence model was presented considering rotational sampling. tower …
Read More »Technique for Fast Detection of Short Circuit Current in PV Distributed Generator
In this paper. a novel fast short circuit current detection technique is proposed for PV inverter based DGs. The proposed short circuit current detector is based on the evaluation of the slope (d dt) and magnitude of the PV inverter current. As soon as it detects a fault that is …
Read More »Electric vehicle smart charging and vehicle-to-grid operation
A comprehensive system leveraging mobile and RFID technologies. aggregation middleware and an aggregated charge-scheduling algorithm that effectively schedules charging and V2G operations for cost savings and peak load reduction has been presented. Intelligently scheduled charging yields a cost savings of 7% for enterprise commuters and 10% for drivers with variable …
Read More »Choice of Pole-Slot Number Combination for PM Generator Direct-Driven by Wind Turbine
Based on comparative study on different pole-slot number combinations and pole-arc coefficients for the 1.5MW directdriven PM wind generator. the following conclusions can be deduced: 1) The pole-slot number combination has significant effect on the positioning torque at no load. Choosing the fractional slot number per pole and per phase …
Read More »