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An expert system for voltage control and reactive power compensation planning in the HEC system


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Le, Tan Loc 1993 , 'An expert system for voltage control and reactive power compensation planning in the HEC system', Research Master thesis, University of Tasmania.

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The paper describes an application of an Expert system to the control of voltages and to the
evaluation of optimum levels of reactive power compensation in electric power systems.

The expert system is designed to assist in Hydro Electric Commission (HEC) transmission planning
studies. Load flow studies of the future configuration of the power system often indicates problems
with low voltage levels. To alleviate such problems a decision is required on the choice of control
actions which could include the adjustment of machine terminal voltages, or of tap changers on
transformers, or the switching of shunt capacitors.

The network sensitivity analysis is utilised to select the most effective control action. The
results include specification of the optimal location for shunt capacitors and recommend a
size of capacitor bank. The expert system also evaluates the security level for different
contingency outages to select the most severe contingency case for the voltage and reactive power
control study. The criteria used is based on reactive power reserve margin.

The expert system was developed on the basis of a commercial package VP-EXPERT. The concept of
the system utilises the sensitivity tree method to formulate the problem and assist in decision­
making. VP-EXPERT interacts with PSSE (Power System Simulator Engineering) which is a power
flow software package used by the HEC in load flow analysis. PSSE is provided with an internal data
manipulation language !PLAN which allows the creation and analysis of a network sensitivity matrix
and the construction of a knowledge base.

The expert system has been successfully tested against the AEP 14-bus network and the North-East
Tasmania subsystem. Results of these tests are discussed.

Item Type: Thesis - Research Master
Authors/Creators:Le, Tan Loc
Copyright Holders: The Author
Copyright Information:

Copyright 1993 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Available for use in the Library and copying in accordance with the Copyright Act 1968, as amended. Thesis (MTech)--University of Tasmania, 1993. Includes bibliographical references

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