power system analysis

1. Assalamu-alaikum
Group members
Name ID
Mymon Uddin 1706100
Shakib Shahria 1706113
Jahidul Islam 1706120
Kazi Mohiuddin Alamgir 1706141
Md.Ahsanul Haque 1706142
Rokonujjaman Rokon 1706150
Taki Tazwoar Ali 1706181
Course no :EEE 412
Course name :Power System II Laboratory
Group no :05
Special Thanks to our course instructor
Md.Obaidur Rahman sir
Asikur Rahman Jowel sir

2. Assessing the Effect of Distributed
Energy Resources on Frequency
Stability in Renewable Power Systems

3. Power System:
Worlds largest and most-complex man made system
 In simplest form, it’s a game of balancing between generation and consumption
 Any imbalance of them can create a problem naming ‘frequency deviation’.
 But power system can’t tolerate too much frequency deviation, so It stops the
system elements causing blackout.
How it works:

4. Power generation system can be:
 Conventional ( Fossil fuel based generator)
 Renewable Energy based ( Solar PV, Wind, Hydro)
There has been a worldwide shift from conventional to dependence on Renewable
Energy Sources (RES).
Because,
 Carbon emission is very high in conventional system
 Fossil fuel availability is limited
 Renewables offers green energy.
 Renewable sources installation cost is decreasing day by day.

5. Recent Trends in power system worldwide:

6. Frequency Response support of Conventional
Power system
 Consists of thousands of rotating machine
 Rotating machines has kinetic inertia in it’s rotor
 In case of any frequency deviation, it releases some kinetic
energy to arrest the frequency deviation
On the other hand, RE based Distributed Energy Resources
(DERs) can’t support frequency response.

7. PROBLEM FORMULATION
 THE DER DOESN’T POSSESS SUFFCIENT HEADROOM UNLIKE A
SYNCHRONOUS GENERATOR.
 FOR A HIGH DER PENETRATED GRID,A SUDDEN TRIP OF GENERATION
OR AN ITERCONNECTION HIGHLY AFFECTS THE FREQUENCY
RESPONSE.
 THE UFLS BECOMES UNAVOIDABLE IN THIS CASE.
 THE PROBLEM IS THE LOAD AND THE DER ARE CONNECTED IN SAME
FEEDERS.
 THEREFORE THE UFLS DISCONNECTS NOT ONLY THE LOAD BUT ALSO
THE DER.
 CONSEQUENTLY THE FREQUENCY RESPONSE BECOME WORSE
INSTEAD OF IMPROVING.
 SO, THE DER DISCONNECTION MUSTN’T EXCEEDS AN ALLOWED
LIMIT.

8. SIMULATION SOFTWARE: PSSE
 PSSE (Power System Simulation for Engineering) is a software tool
developed by Siemens PTI for modeling and simulating electrical
power systems.
 It is widely used by engineers and researchers in the power industry to
analyze and optimize power systems.
 It allows users to analyze different aspects of power systems, such as
load flow, short circuit, dynamic stability, and transient analysis.
 The software is also capable of performing contingency analysis, which
allows engineers to evaluate the effects of equipment failures or outages
on the power system.

9. Single line Diagram
SG
SG
SG
SG
Interconnection

10. FLOW-CHART OF METHODOLOGY
Step 1: Setting initial
value of DER penetration
Start
Step 2: Configuring the
appropriate UFLS scheme
Step 3: Setting initial
value of DER
disconnection
Step 4: Running a
simulation
Does a
blackout
occur?
Step 5: Increment of the
value of DER
disconnection
No
Step 6: Recording the
value of DER
disconnection responsible
for blackout
Step 7: Increment of the
value of DER penetration
Is final value
of DER
penetration
reached?
No
Stop
Yes
Yes

11. SIMULATION SETUP: UFLS Scheme
 The relay response time is 100 milliseconds.
 The breaker time is 50 milliseconds.
 The UFLS scheme restores frequency after an interconnection
outage if no DER is disconnected.
 The DER disconnection scheme is applied only with the first
stage of the UFLS.
Frequency (Hz) % of load shed
49 Hz 20%
48.5 Hz 10%
48.25 Hz 5%

12. Setup for Simulation
 Initial value of DER penetration is kept 25% (Step 1)
 Initial value of DER disconnection kept 15% (Step 3)
 Increment of the value of DER disconnection is 10%
(Step 5)
 Increment of the value of DER penetration is kept 5%
(Step 7)
 The final value of DER penetration is 85%

13. Results- Phase 1: Frequency Response for 25 %
DER penetration case

14. Results- Phase 2: Frequency Response Indices: Frequency Nadir

15. Results- Phase 3: Frequency Response Indices: Settling Frequency

16. Results- Phase 4: DER penetration Vs DER disconnection
DER penetration (%) DER disconnection causing frequency collapse
(%)
25 91
30 81
35 73
40 67
45 63
50 70
55 68
60 66
65 60
70 53
75 45
80 34
85 21

17. Results- Phase 4: DER penetration Vs DER disconnection

18. Results- Phase 4: DER penetration Vs DER disconnection
Name of
parameter
Symbol Value
Regression
co-efficient
R-square 0.8593
Root mean
squared
error
RMSE 7.407
Confidence
bound
-- 95%
Goodness of fit parameters
%_𝑫𝑬𝑹_𝒅 𝒃𝒍𝒂𝒄𝒌𝒐𝒖𝒕,%_𝑫𝑬𝑹_𝑷(𝒊)
≥ − 𝟎. 𝟗 × %𝑫𝑬𝑹_𝒑 𝒊
+ 𝟏𝟏𝟎. 𝟒
Inequality

19. Contribution
Topic Contributor
Paper reading Jahidul Islam, Mohiuddin Alamgir
Software Md. Ahsanul Haque, Taki Tazwoar Ali
Problem and research gap Shakib Shahria, Mymon Uddin
Methodology Rokonujjaman Rokon
Simulation and Data record Taki Tazwoar Ali
Result analysis Jahidul Islam, Mohiuddin Alamgir
Graph plot Shakib Shahria, Mymon Uddin,
Ahsanul Haque
Report All members

20. Thank you