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This paper presents a method for screening synchrophasor data to search for power system events of interest. The method employs the Prony algorithm to estimate mode amplitude, frequency, and damping ratio on actual synchrophasor data. The procedure uses seven different Linear Prediction Model (LPM) orders, plus a 10 second window width that slides in steps of 1 second, to minimize the possibility...
This paper presents a novel approach for determining post-contingency dynamic vulnerability regions (DVRs), oriented to assess vulnerability in real time as part of Smart Grid applications. Based on the probabilistic models of input parameters, such as load variation and the occurrence of contingencies, Monte Carlo-type simulation is performed to iteratively evaluate the system time domain responses...
This panel session paper speculates on new computer applications that may become feasible because of increasing installation of phasor measurement units (PMU) in the high voltage power grid. Some of these applications are already being experimented with — like oscillation detection and dynamic state estimation. Most of these applications are ‘open loop’ and are used as advisory tools or analytical...
In this paper, the time skew problem observed in synchronized phasor measurement unit (PMU) measurements is illustrated and analyzed. The term ‘time skew’ is used to describe the faulty sychronization of measurements from different PMUs which are expected to be synchronized based on the time stamps. The origin of the time skew is presented and a practical example is provided to depict the time skew...
This paper presents an infrastructure and a monitoring and control approach for systems with wind farms that enables coordination of the operation of wind farms with the bulk power system and maximizes the utilization of the available wind energy at the wind farm locations. A hierarchical optimization scheme is proposed in this work. In particular, a system level optimization defines the optimal operating...
The theory of central angle is defined in the context of network behavior for dynamic operation. Making reference to cutset angle theory, a methodology for identifying abnormalities on the network is proposed according to central angle evolution. The model is tested on a power system comprising the Colombian electrical network. The performance and robustness of the model is verified with simulations...
Theory of cutset area is defined in the context of network behavior, as much in steady state as in dynamic operation. With reference to cutset angle theory, a proposed methodology for identifying stress on the network is stated for cutset angle evolution. Potential applications for Phase Measurement Units, PMU, are validated on a Colombian network.
The application of synchronized phasor measurements for system monitoring and control is receiving unparalleled attention in the power industry. The availability of synchronized phasor measurements data in real-time offer unprecedented opportunities for control centre applications to expand the visibility and improve the quality of output results. In that respect, British Columbia Hydro (BC Hydro)...
Entergy, through its American Recovery and Reinvestment Act — Smart Grid Investment Grant, is leveraging the achievements and experience of their existing prototype phasor system and creating a new wide-area monitoring system with advanced decision support tools and visual graphics to assist in the management and surveillance of the Entergy grid. This paper introduces the topics for presentation at...
In this paper, we propose a model-free approach for short term voltage stability monitoring of power system. Our data-driven approach makes use of Phasor Measurement Units (PMU) data to generate the stability certificate for verifying the voltage stability. We employ Lyapunov exponent, a stability tool adapted from ergodic theory of dynamical system, to generate the stability certificate. The time-series...
Classical observability analysis methods that are based on decoupled network equations cannot be directly applied to systems containing voltage and current phasor measurements, since the equations can no longer be decoupled when current phasor measurements are present. Moreover, conventional voltage magnitude measurements are commonly disregarded in conventional observability analysis methods. This...
The recent growth in the synchrophasor measurement and communications technology has been an unprecedented change from an Energy Management System (EMS) control center perspective. For decades, traditional EMS capabilities have been based on 2–4 second SCADA measurements. As the number of milli-second rate, time-tagged synchrophasor Phasor Measurement Units (PMUs) grow in number, control centers now...
This paper discusses experiences in the use of synchronized phasor measurement technology in Electric Reliability Council of Texas (ERCOT) interconnection, USA. Implementation of synchronized phasor measurement technology in the region is a collaborative effort involving ERCOT, ONCOR, AEP, SHARYLAND, EPG, CCET and UT-Arlington. As several phasor measurement units (PMU) have been installed in ERCOT...
While synchrophasor technology has been around for over 30 years it has not been widely incorporated in the power engineering education. Instructional material is rather limited with only a few books being published on the subject so far. This paper discusses the educational issues associated with synchrophasor applications in the Smart Grid and points out to the instructional material being currently...
This paper presents a hybrid topological/numerical method for power system observability analysis, using conventional measurements, provided by SCADA, as well as synchronized phasor measurements, provided by phasor measurement units (PMUs). A PMU placed at a bus can measure the voltage phasor at that bus, as well as the current phasors in some or all the lines connected to that bus. Branch power flow...
Previous work has demonstrated a distributed dynamic state estimator (DSE) that is implemented in the substation level using local data (synchronized and non-synchronized) and can capture in real time the dynamics of the system with speeds of 60 times per second. Due to the plurality of the available measurements in a substation, bad data is a common occurrence. This paper initially focuses on the...
Phasor Measurement Units (PMUs) have been increasingly widespread throughout the power network. As a result, several researches have been made to locate the PMUs for complete system observability. Many protection applications are based upon the PMUs locations. This paper introduces an important application in power system protection which is the detection of single line outage. In addition, a detection...
Previous research into the occurrence of power system frequency extrema revealed that common patterns emerge over time. Using an existing algorithm developed for detecting and validating the extrema, we examine their occurrence in the Eastern (EI) and Western (WECC) Interconnections from January 2010 through September 2011. The results indicate that the frequency extrema continue to follow certain...
This panel session paper outlines one of the research thrust areas in the Power System Engineering Research Center's (PSERC) new initiative funded by the US Department of Energy (DOE) to investigate requirements for a systematic transformation of today's electric grid to enable high penetrations of sustainable energy systems. The proposed research under this thrust area aims at defining and determining...
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