2. 2/22
Outline of the Presentation:
Overview
• Potential Challenges of
Renewable Integration
• Literature review
Distribution system
monitoring necessity Will be
raised by RES penetration
Conclusion
4. 4/22
RESEARCH PROBLEM
The system voltage must be kept constant; the main reason is that all the system devices insulation level are
designed for a nominal voltage, and voltage violation may be harmful and damage insulation
RES integration , Power Flow and Voltage Regulation
T. Ehara, "Overcoming PV grid issues in urban areas," International Energy Agency, Photovoltaic Power Systems Program, Rep. IEA-PVPS T10-06-2009, 2009.
5. 5/22
Proposed Methods
Reverse power flow
Active power curtailment
Usage the storage and electric vehicle
Demand side management (HPWH)
Using FACTS devices (SVC, D-STATCOM, D-SMES)
Voltage control
Increasing the conductor size
Reducing the setting of OLTC
Operation at leading power factor
Coordination of conventional voltage regulator (OLTC,
SVR, capacitor bank) with FACTS
Summary of proposed methods for mitigating
the reverse power flow and voltage control in presence of RES
Literature Review
6. 6/22
Distribution system monitoring necessity
Will be raised by RES penetration
1. Distribution systems have been designed for radial and
unidirectional power flow.
7. 7/22 Schematic of the IEEE 8500 Node Test Feeder
Distribution system monitoring necessity
Will be raised by RES penetration
8. 8/22
Distribution system monitoring necessity
Will be raised by RES penetration
1. Distribution systems have been designed for radial and
unidirectional power flow.
IEEE 8500 node test feeder power flow direction for PL=100%.
The red colors shows the reversed power flow part of feeder.
The PV units’ location are shown by Orange stars
9. 9/22
Distribution system monitoring necessity
Will be raised by RES penetration
1. Distribution systems have been designed for radial and
unidirectional power flow.
IEEE 8500 node test feeder power flow direction for PL=100%.
The red colors shows the reversed power flow part of feeder.
The PV units’ location are shown by Orange stars
10. 10/22
2. The minimum voltage drop which must be kept within
standard limits, was the main concern of distribution system
planner for a long time.
Distribution system monitoring necessity
Will be raised by RES penetration
11. 11/22
2. The minimum voltage drop which must be kept within
standard limits, was the main concern of distribution system
planner for a long time.
Distribution system monitoring necessity
Will be raised by RES penetration
12. 12/22
2. The minimum voltage drop which must be kept within
standard limits, was the main concern of distribution system
planner for a long time.
Distribution system monitoring necessity
Will be raised by RES penetration
13. 13/22
Distribution system monitoring necessity
Will be raised by RES penetration
3. Distributed RES integration with intermittent characteristic, increases
the vulnerability of small wire size feeder to overload conditions.
Due to changing the switch patterns, the distribution network configuration
is a dynamic variable.
14. 14/22
Distribution system monitoring necessity
Will be raised by RES penetration
4. Distributed ONE-PHASE RES integration with intermittent
characteristic, increases the UNBLANCED LOADING of the system
15. 15/22
Distribution system monitoring necessity
Will be raised by RES penetration
4. Distributed ONE-PHASE RES integration with intermittent
characteristic, increases the UNBLANCED LOADING of the system