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Transcript of 1 Clemson University Electric Power Research Association Zhenyu Fan IEEE Student Member Dynamic...
1Clemson University Electric Power Research Association
Zhenyu FanZhenyu Fan
IEEE Student MemberIEEE Student Member
Dynamic Performance of Distribution Systems with Distributed Generation
Adly A, GirgisAdly A, Girgis
IEEE FellowIEEE Fellow
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OUTLINE
•Introduction
•Objectives
•Modeling and System description
•Simulation and Results
•Conclusions
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Introduction
• Fault Analysis: a symmetrical component-based approach
• Induction Machine: widely used in the system
• DG (Photovoltaics) Modeling: power electronics related
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• Fault analysis in distribution system with IM and DG(PV)
• The effects of DG(PV) in the faulted system
• The correct operation of DG and loads under the fault condition
Goals
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Example system:
1
2
3
4 5 6 7
Subsystem 1
Subsystem 2
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System Description by PSCAD
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System Description by SIMULINK
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Fault Analysis 1. Normal distribution system
Single phase A-ground fault (0.1-0.15 sec)Steady State
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Fault Analysis 2. With Induction Motor
Single phase A-ground fault (0.1-0.15 sec) Disconnect IM after 0.45 secs Disconnect IM after 0.15 secs
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Fault Analysis 3. With Photovoltaics
Single phase A-ground fault ( at 1.8 sec, PV disconnected from system at 1.9 sec)
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Fault Analysis 4. With IM + PV (case 1)
Single phase A-ground fault ( at 1.7 sec, 1.73s(2 cycles) open breaker of Motor, 1.8s
disconnect PV, 1.9s fault cleared )
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Fault Analysis 4. With IM + PV (case 2)
Single phase A-ground fault ( at 1.7 sec, 1.73s open breaker of PV, 1.8s disconnect Motor,
1.9s fault cleared )
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050
100150200
Computing time
1 2 3 4
Different Systems
Comparison of two softwares
PSCAD
SIMULINK
Comparison of Matlab/Simulink and PSCAD
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Conclusions
• The waveform of the fault current and voltage become worse because of the induction machine.
• PV generated the harmonics into system, so some filters are needed.
• During the fault, DG should be tripped before the fault is cleared.
• The accurate operation and smart control of DG and loads
can damp the oscillation and make the system stable.
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Thank you!