Masters Theses


“The main purpose of this thesis is doing the evaluation of power factor controllers (PFC) for enhancing voltage stability. Effective remedial controls are required to maintain stability under severe disturbances. Remedial actions based on the exciter are, Power Factor Controller (PFC) and Line Drop Compensation (LDC). A power factor controller (PFC) is not always considered beneficial under severe disturbance conditions. Essential voltage support after disturbance can be obtained by using power factor controller as a tool for reactive power management during pre-disturbance condition. Operation of the over excitation limiter (OEL) can sometimes accelerate voltage collapse. The PFC is used in such a way, that it avoids the operation of OEL during predisturbance condition.

Case studies are shown on the CIGRE 10 bus-system and the Western Systems Coordination Council (WSCC) network. A severe disturbance is introduced into the test system. Load bus voltages and reactive powers are observed. Three cases are studied in this thesis. These are:

Case 1: Case with no PFC present - the base case.

Case 2: Case with PFC.

Case 3: Case with no PFC present but with LDC.

Comparisons of the above three cases for the test systems are shown. A cumulative margin index is used to determine the degree of stability of the system. Studies show higher stability margins can be attained and voltage instability can be avoided under some conditions with the use of a power factor controller”--Abstract, page iii.


Chowdhury, Badrul H.

Committee Member(s)

Stanek, Keith
McMillin, Bruce M.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri--Rolla

Publication Date

Fall 2000


ix, 72 pages

Note about bibliography

Includes bibliographical references (pages 69-71).


© 2000 Rajesh Pudhota, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Thesis Number

T 7818

Print OCLC #


Link to Catalog Record

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