Shi-lin Chen. Control and Automation of Electric Power Distribution Systems Presented by
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1 Control and Automation of Electric Power Distribution Systems Presented by Shi-lin Chen Professor, Chung Yuan Christian University Professor Emeritus, National Tsing Hua University 1
2 Source for pp.3-17: J.A. Momoh, ELECTRIC POWER DISTRIBUTION, AUTOMATION, PROTECTION, and CONTROL, CRC Press, Source for pp.18-31: J. Northcote-Green and R. Wilson, CONTROL and AUTOMATION of ELECTRICAL POWER DISTRIBUTION SYSTEMS, CRC Press,
3 Distribution Automation and Control Trouble Calls Functions 3
4 Distribution Management Systems DMS Function 4
5 Distribution Management Systems 5
6 Communication Systems for Distribution Automation Systems Amplitude Modulation(AM) 6
7 Communication Systems for Distribution Automation Systems Frequency Modulation(FM) 7
8 Communication Systems for Distribution Automation Systems Frequency-Shift Keying(FSK) 8
9 Communication Systems for Distribution Automation Systems Phase-Shift Keying(PSK) 9
10 Communication Systems for Distribution Automation Systems LAN Bus Topology LAN-ring Bus Topology 10
11 Communication Systems for Distribution Automation Systems LAN-star Topology LAN-tree Topology 11
12 Communication Systems for Distribution Automation Systems Metropolitan Area Network(MAN) 12
13 Communication Systems for Distribution Automation Systems Simple frame-relay network 13
14 Communication Systems for Distribution Automation Systems Frame-relay frame 14
15 Communication Systems for Distribution Automation Systems DA Frame-relay 15
16 Communication Systems for Distribution Automation Systems OSI 16
17 DA COMMUNICATION PHYSICAL LINK OPTIONS 17
18 DA COMMUNICATION PHYSICAL LINK OPTIONS 18
19 DA COMMUNICATION PHYSICAL LINK OPTIONS 19
20 DA COMMUNICATION PHYSICAL LINK OPTIONS 20
21 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS MODBUS Transferring control signals between programmable logic controllers 21
22 DNP3.0 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS Fragmented messages Multiple Application Layer messages may be built and transmitted sequentially A message may be either a single-fragment message or multifragment message 22
23 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS Unsolicited response Error detection Duplicate frame detection Handles states of the media Synchronization across the media 23
24 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS Frame size Data link control information Help the remote receivers determine where the frame begins To coordinate their activities All-call-message in which the frame should be processed by all devices Cyclic redundancy check tasks A pair of CRC octets are included,transmission errors can be detected 24
25 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS IEC Enhanced performance architecture Perform their local application tasks called application processes Communication process between station A and station B 25
26 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS The application data pass down through all layers All control data are dropped until the original application data are received Application service data unit(asdu) With no idle line or gaps between asynchronous characters 26
27 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS LPCI=S+L+L+S+C+A+CS+E S=Start character with a fixed defined bit pattern, L=Length character, C=The link control character, A=The link address field, CS=The check sum character, and E=End character with a fixed defined bit pattern 27
28 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS 28
29 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS UCA 2.0, IEC Manufacturing Message Specification(MMS) Open System Interconnection reference model, and seven layers integrate the communication protocol Application Layer standard ISO/IEC 9506 These object models have named variables instead of point lists. When the objects are accessed by MMS, common data formats and variables are associated to the object model 29
30 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS Two main levels of field device object models, the basic A switch control, and the specialized Breaker control or breaker reclose control The object model components are Configuration parameters: Values that determine the setup of the device and are not expected to change often 30
31 DISTRIBUTION AUTOMATION COMMUNICATIONS PROTOCOLS Settings: Values that determine the operation of the device and can change often Operation: Values that represent the actual output decisions or commands of the model to perform its functions. Status: Represents the indication or values directly concerned with the functions of the device Associated parameters 31
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