Large scale distributed measurement systems are the object of several applications and research works. The goal of the present work is to develop, by employing GPS receivers, measurement techniques suited to the continuous monitoring of the electrical quantities in distribution networks, in terms of synchronized phasors. The proposed measurement procedures, differently from commercially available Phasor Measurements Units (PMUs), are based on general-purpose acquisition hardware and processing software, thus guaranteeing the possibility to be easily reconfigured and reprogrammed, according to the specific requirements of the different possible fields of application and to their future developments.
Several different approaches for the detection of voltage dips in electic power systems have been proposed in the literature to overcome the limits of the procedure proposed by the International Standard, based on the voltage root mean square. In this paper the most promising of these approaches are compared, by computer simulations, in terms of both statistical performance and response time, which is a critical issue for the development of real-time compensation systems
An alternative detection algorithm, based on the Generalized Likelihood Ratio Test (GLRT), is proposed for the detection of voltage dips in power systems. The proposed method is compared to the classical approaches based on the voltage root mean square. It is shown, by computer simulations, that the GLRT may provide competitive performance, in terms of capability of correctly detecting the dip starting instant.
Synchronized 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
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