Design of a reactive power droop control for generation system without inertia

• Main Author: Tian, Terence Peng Yu
• Other Authors: Foo Yi Shyh Eddy
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/77781
• Institution: Nanyang Technological University

In this report, a conventional Voltage-Reactive (V-Q) and Frequency-Power (F-P) droop are introduced in the microgrid. Renewable generation units connected to the microgrid introduces voltage and frequency instability into the system due to their intermittency. The droop control is developed and implemented to investigate the stability of the voltage and frequency using the conventional droop curve. The droop control is simulated using the equipment located in the Clean Energy Research Laboratory (CERL) at S2-B7C-05 and LabVIEW is used as the main programming platform. A 18kVA three-phase Programmable AC Source also called the Chroma Programmable AC Source, a 13.5kVA Synchronous Generator and a 10kW Simulated Industrial Load to vary the load demand would also be used to design and validate the droop control. The key difference between the 18kVA three-phase Programmable AC Source and the 13.5kVA Synchronous Generator is that the 18kVA three-phase Programmable AC Source does not have rotating parts and hence it does not have inertia. However, the 18kVA three-phase Programmable AC Source could still be programmed to emulate the F-P droop with the exception that the rate of change of frequency would be very large as compared to the Synchronous Generator. The problem with the high rate of change of frequency could be fixed by programming the 18kVA three-phase Programmable AC Source to include inertia. The results show that the droop control can maintain both the system frequency and voltage to its nominal rating by regulating the setpoint of the respective droops. This indicates the significant effect that the droop control has on maintaining the stability of the voltage and frequency in the microgrid.