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Comparison Between Communication Infrastructures of Centralized and
Decentralized Wide Area Measurement Systems
Mohammad Shahraeini, Mohammad Hossein Javidi, and Mohammad Sadegh Ghazizadeh
Presented byYonghe Guo
Page1
Outline
Background Introduction– Power Grid Control System
– Communication System (CI) Problem Formulation
– Optimum Communication Network
– LoM and NoR Experimental Result
Page2
Power System Control
utilizing the application of control theory and technology, optimization methodologies, and intelligent systems to improve the operation of power systems during normal and abnormal conditions
Page3
Data are acquired from data resources
Measured data are transmitted to control center through “measuring communication
system”
Decisions are made with this data and information
Control commands are sent to controllable devices through “controlling communication
system”
Transmitted commands are run by controllable devices
Control Strategies - Centralized control strategy
Page4
Control Strategies - decentralized control strategy
Page5
Functions of Control Centers
Energy Management System– Online state estimation
– load flow
– optimal power flow
– load forecast
– economical dispatch
Page6
Communication System – open system interconnection layer model
Page7
Communication System – Classification
Dependent media: Part of power network elements– Power line communication
– Broadband over power line
– Optical power ground wire Independent media: not rely on the power network
– Open Access Media (wireless)
– Internet
– Telecommunication Network
Page8
Communication System – Characteristics
Cost Bandwidth Propagation Delay Security Reliability
Page9
Two Aims
use an optimization method to design the minimum length communication backbone network for any given power grid with determined measurements
proposed two new indices which can be used for comparing two different approaches of CIs
Page10
Measurement Placement – Centralized Strategy
Page11
J. Chen and A. Abur, “Placement of PMUs to enable bad data detection in state estimation,” IEEE Trans. Power Syst., vol. 21, pp. 1608–1615, Nov. 2006.
Measurement Placement – Decentralized Strategy
Page12
L. Zhao and A. Abur, “Multiarea state estimation using synchronized phasor measurements,” IEEE Trans. Power Syst., vol. 20, pp. 611–617, May 2005.
Decentralized ACCs are assumed to be at the chosen slack buses of different areas.
Optimal Communication Network
the links between data resources are considered to be weighted
the length of each transmission line is considered as the weight for that link
the optimal communication network is defined as the minimal spanning tree connecting all nodes.
Page13
Two Indices
NoR (number of routers) is a number of nodes between considered node and control center and also known as “network hops”.
LoM (length of media) represents the length of media between considered node and control center.
Page14
NoR and LoM Applications - Latency Calculation
Page15
NoR and LoM Applications - Reliability Calculation
Page16
NoR and LoM Applications - Cost Calculation
Page17
Experimental Setup
IEEE 118 Testcase Apply Genetic Algorithm to find the MST Use Breadth First Search to estimate NoR and LoM
Page18
Experimental result
Page19
Experimental result - Distribution function of NoR and LoM
Page20
Experimental result – Variance and Mean value of NoR and LoM
Page21
Thanks!
Page22