Quality of Grids using PSCAD
With the increasing penetration of renewable energy. Inverter-Based Resources (IBRs) are
gradually replacing synchronous generators in power grids. Present-day IBR control may
be insufficient to ensure grid stability in a future inverter dominated power grids. One of the
main causes of instability is poor power quality. In this assignment you will be investigating
the power quality of a typical IBR grid as shown in the circuit of the figure below.
The figure consists of a single phase 240 Vrms, 50 Hz source and:
• Three resistive loads. Each load has a resistance of 48 0.
•
Three EV charging converters/Inverters through a 24 resistor.
•
A solar farm that is composed of 15 PV panels. Each panel has a rating of 24 V and
current of 15 A. Panels are connected in series and parallel to provide an output
voltage and current of 240 Vrms and 45 A respectively.
240 Vrms
50 Hz
V, 1,1
Transmission Line 1
TL1 -0.05
Transmission Line 2
Mini Solar Farm
TL2 = 0.05 P
Converter
N
24
460
52
EV
Converter/Inverter
FL
480
Load/nDemonstration of the above concept will be achieved with the following steps:
I. Construct the skeleton of the given circuit in PSCAD.
Design appropriate Inverters/Converters for this circuit.
Calculate all the required values for each circuit component etc.
II.
III.
IV.
Measure voltage and current at the generator side and then investigate the quality of
measured V, I and frequency for the following scenarios:
a) The circuit operating under fully normal conditions (without the EV
charging/discharging stations and Solar farm)
b) The circuit operating in semi normal condition (some of the EV charging
stations and the solar farm are switched in)
c) The circuit operating under no normal conditions (the EV charging stations
and/or solar farm are switched in and out).
Marking Scheme
Introduction and Literature Review
10 Marks
Design of Inverters and converters
10 Marks
Creating various scenarios with the given switches in the above circuit.
10 Marks
Construction of the above circuit in PSCAD
20 Marks
Results and Analysis: Demonstration of scenarios with the constructed circuit in PSCAD
Conclusion and report presentation
10 Marks
References
Bonus for employment of PV module and EV Module
Published date: 10th October 2023
extension pscx
10 Marks
10 Marks
20 Marks
(Please note, you will need to submit your constructed PSCAD file with
()
Fig: 1
Fig: 2