A modular phasor measurement unit design featuring open data exchange methods

Abstract

Synchrophasor measurements continue to show great potential for innovative protection, control and analytical functions in the emerging Smart Grid. Commercially available Phasor Measurement Units (PMU) are generally produced and sold in a manner that makes their internal workings unavailable, or closed, to the end user. With this in mind, the authors have pursued the goal of producing an open source PMU, the OpenPMU.This paper describes how the functions of the OpenPMU have been separated into distinct modules. This is a significant change in design, and has been done so with the intention of reducing the effort required for persons with interest in PMU technology to adopt OpenPMU components in their designs.Using the design described in this paper, in particular the open data exchange schema, it is possible to interchange modules with ease. For example, one may change the phasor estimation algorithm, without affecting signal acquisition or communication. The modular design also simplifies the use of OpenPMU components in popular simulation environments.

Cooley-Tukey FFT Algorithm based on GDFT for Phasor Estimation by PMU under Power Quality Disturbances

“…Figure 1 shows a basic block diagram of a PMU [13]. A PMU generally consists of three main blocks: measurement, calculation, and communication [16]. Phasor Measurement Unit Components.…”

“… The computed synchrophasor and other information are transmitted to the PDC to be interchanged between other PMUs for monitoring, control applications, and system protection using communication units [13,16].…”

Secure Real-Time Industrial IoT Communications in Smart Grids Using Named Data Networking

“…Phasor Measurement Unit Phasor Measurement Units (PMUs) are a key enabling technology of smart grids [4]- [6]. A PMU is an instrument which measures the voltage and current waveforms of an electrical power system, synchronised to a global time standard such as GPS.…”

A Simple Time-Domain Algorithm for Synchrophasor, Frequency and ROCOF Estimation

“…A well-known common issue to all estimators based on the Taylor's series synchrophasor model (particularly the TFT) is their considerable computational burden as the data record size grows. Even though this problem can be mitigated using real-valued equations and optimizing the number of harmonics included in the measurement model [19], alternative and simpler techniques would be definitely more suitable for lowcost embedded platforms (such as those adopted within the OpenPMU project [20]), which could promote the diffusion of PMUs over a large scale. In this respect, the Teager's algorithm (developed in the eighties to estimate the energy of time-varying audio signals on-the-fly [21]) is able to estimate amplitude and frequency of dynamic signals with good accuracy, low computational burden, and sample-by-sample temporal resolution [22].…”