1,720,971 research outputs found
Dynamic Spectrum Access Communications: Wavelet Modulation with Unequal Power Allocation
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Peak-to-average power ratio reduction in multi-carrier system using genetic algorithms
No full textThis work presents a novel approach to the reduction of peak-to-average power ratio (PAPR) in multi-carrier modulation: partial transmit sequence (PTS) is optimised by opportune tailored genetic algorithms (GA) that allow achieving solution with pre-selected accuracy and reduced computational burden. A comparative study on both orthogonal frequency division multiplexing (OFDM) and wavelet packets multi-carrier modulation (WP-MCM) has been conducted. Results show that although WP-MCM outperforms conventional OFDM schemes in terms of PAPR, GA applied to PTS are more effective in reducing PAPR for OFDM rather than for WP-MCM
A software-only PTP synchronization for power system state estimation with PMUs
No full textSynchronized Phasor Measurement Units (PMUs) are becoming a key element of monitoring, protection, control and state estimation applications in power systems and are the basis for the implementation of Wide Area Monitoring Systems (WAMSs). This paper investigates the possibility of using a software-only PTP (Precision Time Protocol) synchronization method to synchronize different Phasor Measurement Units (PMUs) and how this synchronization impacts the State Estimation. In this context, as a case study, the output data of the PMUs have been used to estimate the state of a power system of reduced size and complexity. A laboratory experimental setup has been built to evaluate the performance achievable with the proposed synchronization solution. The results thus obtained and the performance analysis are discussed in this paper
Impact of the Model on the Accuracy of Synchrophasor Measurement
No full textPhasor measurement units (PMUs) are becoming one of the key issues of power network monitoring. They have to be able to perform accurate estimations of quantities of interest either under steady-state or transient conditions. Among all the sources which may contribute to the uncertainty introduced by PMUs, this paper analyzes the impact of the phasor estimation models on the accuracy of these devices, focuses on algorithms proposed in the literature for the estimation of dynamic phasors, and studies their performances under several different conditions
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