4 #372 – performance evaluation of microgrids in...
TRANSCRIPT
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Performance Evaluation of Microgrids in Occurrence of
Intentional Islanding2013 IEEE PES Conference on Innovative Smart Grid Technologies
(ISGT Latin America)
Marianna N. BacelarTatiana M. L. AssisGlauco N. Taranto
COPPE / UFRJ
15 /04/2013
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AgendaI. Introduction
II. Simulation resultsI. Intentional islandingII. Microgrid survival III. Reconnection
III. Conclusion
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Increase in requests for connections of small
generators in distribution networks: government
incentives
Possibility of islanding operation with microgrids
disconnected from the main system
Brazilian grid procedures for distribution networks
I. Introduction
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II. Study Case
An actual rural feeder in the Rio de Janeiro State
Two small‐hydro generators(2 x 6,6 MVA)
The DG capacity is able to supply the feeder load: 9,2MWmax
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III. Analysis
Simulation tool: software Simulight with three‐phase
modeling
Performed analysis:
I. Intentional islandingII. Microgrid survival
Short‐circuit
Daily load curve
III. Reconnection
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A) Intentional Islanding
Event:
Three‐phase short‐circuit at bus 49
Consequences:
Protection action
Microgrid islanding
Is the islanding well‐succeeded???
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A) Intentional Islanding
Islanding feasibilityScenarios:
Unsuccessful islanding: Heavy load and low generation scenario
Well‐succeeded islanding: All other scenarios
Load GenerationHeavy 9,3 MW Hight 9 MWMedium 6,2 MW Intermediate 6 MWLight 3,1 MW Low 3 MW
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Frequency at both sides of the coupling circuit breaker
Medium load and Intermediate generation scenario
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Microgrid Voltages
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B) Microgrid Survival Operating in islanded mode
I) Phase to ground short circuit at #292
49
162
Load G
157
Load AP
100
120
292
Load D
127
Microgrid339 13,8 kV
340 25 kV
341265272
Load RC
Load L
238
DG
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Measures during the short‐circuit
GD frequency during the short‐circuit
Three phase currents Three phases voltages at the fault point
Microgrid voltages
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B) Microgrid Survival Operating in islanded mode
II) Daily load curve
49
162
Load G
157
Load AP
100
120
292
Load D
127
Microgrid339 13,8 kV
340 25 kV
341265272
Load RC
Load L
238
DG
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GD Power GenerationMicrogrid loads: Active power
Measures at both sides of the coupling circuit breaker
Capacitor bank on
Capacitor bank off
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C) ReconnectionReconnecting the microgrid to the main grid
I) Forced circuit breaker
closing
coupling circuit breaker
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Measures at both sides of the coupling circuit breaker
Frequency
Voltage Voltage angle
microgridreconnection
1 s
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Torsional effort evaluation during the random reconnection
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C) ReconnectionReconnecting the microgrid to the main grid
II) Synchronism check relay
25
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Measures at both sides of the coupling circuit breakerVoltage Voltage angle
additionalsignal toAVR
microgridreconnection
8,79 s
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Torsional effort evaluation during controlled reconnection
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Increase of distributed generationPotential to implement the intentional islandingBenefits for the system
The paper has analyzed a actual microgrid and the results have shown:
Success of islanding depends strongly on the balance of load x generation in microgrid at the time of islandingThe synchronized reconnection is important to avoid prohibitive mechanical stress
III. Conclusion