Synchronized phasor measurements in power systems

“…a sensor that can measure voltage amplitude and angle [11]). Agents can communicate, via some communication channel that could possibly be the same power lines (via power line communication -PLC -technologies).…”

Section: Model For the Cyber Layermentioning

confidence: 99%

A Distributed Feedback Control Approach to the Optimal Reactive Power Flow Problem

Bolognani

Zampieri

2013

Control of Cyber-Physical Systems

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Abstract. We consider the problem of exploiting the microgenerators connected to the low voltage or medium voltage grid in order to provide distributed reactive power compensation in the power distribution network, solving the optimal reactive power flow problem for the minimization of power distribution losses subject to voltage constraints. The proposed strategy requires that all the intelligent agents, located at the generator buses, measure their voltage and share these data with the other agents via a communication infrastructure. The agents then adjust the amount of reactive power injected into the grid according to a policy which is a specialization of duality-based methods for constrained convex optimization. Convergence of the algorithm to the configuration of minimum losses and feasible voltages is proved analytically. Simulations are provided in order to demonstrate the algorithm behavior, and the innovative feedback nature of such strategy is discussed.

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“…This paper is devoted to the detection of long-term voltage instability, driven typically by Load Tap Changers (LTCs), OverExcitation Limiters (OELs) and restorative loads. These long-term dynamics can be monitored through PMUs [5], properly located in the network [6], and able to provide successive system "snapshots" at a much higher rate than the present-day SCADA systems. Although the PMU accuracy is limited by that of current and potential transformers, transducers, etc.…”

Section: A On the Use Of Pmus For Voltage Instability Detectionmentioning

confidence: 99%

Detecting with PMUs the onset of voltage instability caused by a large disturbance

Glavić

Cutsem

2008

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century

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Abstract-This paper deals with long-term voltage instability triggered by the outage of transmission or generation equipments. It is shown how the onset of voltage instability could be detected in real-time from post-disturbance bus voltages provided by Phasor Measurement Units (PMUs), assuming observability of the whole region prone to voltage instability. An extended set of equilibrium equations is fitted to the measurements and the change in sign of sensitivities is monitored. The latter are easily computed even for a large system. The important effects of overexcitation limiters and load tap changers are taken into account. The approach is illustrated on a 52-bus 20-machine system, where PMU outputs are simulated from detailed time simulation.

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Synchronized phasor measurements in power systems

Cited by 955 publications

References 1 publication

Using ANN to Estimate the Voltage of Unobservable Buses When One PMU or its Communication Fails

Using ANN to Estimate the Voltage of Unobservable Buses When One PMU or its Communication Fails

A Distributed Feedback Control Approach to the Optimal Reactive Power Flow Problem

Detecting with PMUs the onset of voltage instability caused by a large disturbance

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