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Visually Interactive Program for Transmission System Operation Planning and Trainee Assessment with Artificial Intelligence
VIPTOP-AI is a transmission system simulator, which models both overhead line and cable transmission systems. It integrates a. c. load flow, modeling of overcurrent relays and breaker operation and the interactive trainee’s control actions. It is designed for both undergraduate teaching and training of engineers in utilities. Facilities are provided for the instructor to specify scenarios in different networks to assess the understanding of the trainees and their control strategy under various loading conditions.
The user interface is visually interactive and made similar to that commonly used in a control centre. Standard menu driven selection, pull-down menu, icon clicking and interactive dialogue boxes are provided for the trainee to :
2. AUTOMATED LOAD FLOW AND BREAKER TRIPPING After each trainee’s control action, load flow will be calculated and the IDMT overcurrent relays are modeled. The corresponding breaker will trip if the load current exceeds the relay setting. Once a breaker trips, load flow calculation will be repeated. The MW and Mvar flows of each circuit and the voltage magnitude in each bus will be updated accordingly on the single line diagram. VIPTOP-AI provides four main modules, namely, load flow, practice, and assessment on an overhead transmission system and a cable transmission system. Load flow. The trainee may examine the results of the load flow calculation for a number of different networks given by VIPTOP-AI. The trainee may alter various control variables such as load at each substation, voltage at generating bus, transformer tap, etc., one at a time, and observe the changes on the voltages, circuit loading, transmission losses and the output from each generator. The trainee may practise the control of the active and reactive power, transformer tap and the capacitive and reactive power compensation. Practice. There are four built-in scenarios generated one after another and the trainee has to work out the necessary control actions to rectify the network violations. The four scenarios are, leading operation, over-voltage due to error in the transformer tap, leading and lagging operation between two sources, and the appropriate amount of reactive compensation in a cable network.
Overhead Line Transmission System. There are four built-in scenarios generated in a simple 230 kV overhead line transmission network consisting of one hydro and one thermal power station with a load centre. The four scenarios are, the light load over voltage, overload due to reactive power, medium load operation with one additional line but with an error in the reactive power compensation and the peak load operation with an error in transformer tap. Cable transmission system. Four scenarios are generated in a 230 kV cable transmission system. The four scenarios are, overload and under voltage due to reactive power, loss of a cable resulted in a circuit trip on Mvar-overload, loss of a cable resulted in a circuit trip on MW-overload, and system split due to a cable fault and the cascaded tripping. VIPTOP-AI provides built-in features for the instructor to specify various scenarios in a scenario file. Each scenario is created by one or a combination of several events on a selected network with a scenario ID as follows:
The evaluation of a trainee’s performance is focused on ten criteria, namely supply interruption, generator breaker trip, transmission line breaker trip, split network, generation reactive limit violation, dead bus, overloaded line, percentage load reduction, voltage violation and generator power factor limit violation. All errors are logged and evaluated automatically by demerit points. The instructor may adjust the number of demerit points for each type of error and the conversion from the total demerit points to an appropriate grade. 6. ARTIFICIAL INTELLIGENCEAt the end of each scenario in practice or assessment, an AI button is provided for the trainee to activate the AI solution generated by the built-in core rules. Once the AI button is clicked, a list of recommended full solution to eliminate all the network violations will be given. The list of the recommended actions will then be executed one after another and the trainee may view the relevant network changes as a result of implementing each action. The trainee may examine how all the violations are gradually eliminated by the end of the action list. Obviously, the trainee may compare the differences in the AI solution and the trainee’s solution. Through comparison, the trainee will learn and will be able to have a better performance in managing the subsequent scenarios. Similar AI option is also provided during the load flow calculation.
8. License and FeeVIPTOP-AI is available under a single license for a single copy price of S$4,800. As a promotion, the first copy is priced at S$2,000. The second copy will be at the original price of S$4,800. The third and subsequent copies will be at S$1,800. 9. FAX SERVICE AND DEMOA 24-hour Fax service is available to provide technical support and to answer any enquiries. The Fax number is (65) 256 0382. A free demo diskette will be posted on request. 10. HOW TO ORDERMake bank cheque in Singapore dollars payable to Byte Power Publications and post to 10 H, Braddell View, #23-30, Singapore 579727. VIPCROP with a user’s guide will then be delivered. * Click on the thumbnails below for sample display
BYTE POWER PUBLICATIONS 10H, Braddell Hill, #23-30 Singapore 579727 Tel: (65) 6256-0101 Fax: (65) 6256-0382
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