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!