Testbed for Generator Torque Oscillations

Disturbance on power systems such a faults, large variations in power generation or power consumption can cause oscillations in phase angle, frequency, voltage magnitude, which in turn combine to result in oscillations in real and reactive power generation. The response of synchronous generators can be characterized using the solution to the swing equation for most cases, which represents the angle variation for very small changes in frequency:



This is driven by the transient mismatch between mechanical input power and electrical output power and the resulting response of the electromechanical system.

=Project Definition= Conventional wisdom is that the generator will slip a pole if the system swings any further. However, recent field data has demonstrated that the some machines have been not done so and their excitation control has pulled them back to stability.

=Background= A typical response for a stable swing would exhibit damped oscillations:



Or if we plot power versus angle:



If the system is loaded more heavily or the protection and control response is slower, the response is more severe, and the generator may near its transient stability limit:



The angle swings almost to the stability limit



=Project Obejective= Building on the data acquisition system designed by a 2018-2019 senior design team design a test bed and test plan for testing generator performance during power swings, especially those near boundary of pole slipping

(1) Learn to use the present data acquisition system, and in light of the project needs propose, design and implement modifications as needed

(2) Develop, test and implement test procedure for safely operating the generator in the appropriate operating conditions.

(3) Integrate data from all measurement devices used in a time stamped and synchronized format for post processing

(4) Documentation.

=Data Acqucisition System designed by 2018-2019 Senior Design Team=



Data_Acquisition_System_for_Synchronous_Generator_Transient_Performance

=Hardware Devices=

PVC Sheet
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Electronic Wire


We choose 18AWG cable which fusing current is 81A.This value meets our experimental requirements. Here is the link of American wire gauge.



https://en.wikipedia.org/wiki/American_wire_gauge

Standard Banana Plug


We use the same brand banana plugs as those in the lab. Thus,it is more convenient when customers use or modify test beds.

https://www.pomonaelectronics.com/products/banana-plugs-jacks-and-hardware

Female Banana Plug


We use female banana plug to attach the plug-in signal.

Terminal Strip


The terminals easily can be re-used in the field, allowing for the replacement of wires or equipment, generally with standard hand tools. Screw terminals usually avoid the requirement for a specialized mating connector to be applied to the ends of wires.

https://en.wikipedia.org/wiki/Point-to-point_construction#Terminal_strip_construction

Fork Connectors


We use fork connectors to let hard device reach the terminal strip.

Allogator Clips


We use alligator clips to replace the mini grabber. When it is connected to a shunt resistor, the hardware can better fit the panel of the test bed.

=Testbed Design=

Soliod Model


We use a cart as a base. We put testbed, DAQ, Monitor, Desktop and CT on this cart.

Circuit Design


We hide all the cables behind the front panel. Circuits are shown in the picture. All hard devices are designed for easy removal and installation. Thus, there will be only female banana plug on the front panel.When we use this test bed, we just need to simply use a plug cable to connect the channels to the female banana plug on the panel.

=Experimental Results and Bondary Conditions=

=Validation=

=Team Members=

=Additional Documentation=

Team Contract



Meeting Minutes

Presentations



Client Interview