REACTIVE POWER CONTROL TO ALLEVIATE BUS VOLTAGE VIOLATIONS IN AN AC-DC POWER SYSTEM
Abstract
Multiterminal DC system offers operational advantages in network reactive power flow control. The var control capabilities of the DC system is of particular interest in this thesis. This thesis presents a formulation for coordinating multiterminal DC systems in connection with the conventional reactive power sources to correct bus voltage violations in the AC network as a sequence of Linear Programming (LP) subproblems. Using this formulation a number of algorithms for obtaining the desired controls are investigated. The usefulness of the DC system for reactive compensation especially during light load periods is demonstrated. The basic algorithm which uses a dual LP technique and based on the full linear model is found to be not suitable for large AC-DC power system because of the considerable computation time required to otain the controls. Simplifying the full model by taking advantage of the approximate decoupled relationship between the real and reactive power components and using a dual simplex type LP technique, a much faster algorithm is developed. Based on the tests performed on a 5 terminal, 30 bus AC-DC system, the results obtained were satisfactory and showed promise for on-line application.
Degree
Ph.D.
Subject Area
Electrical engineering
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