Controlling the On-Load tap Changer Control of a Step-Down Transformer Taking into Account the Oper-ating Parameters of the Electric-Arc Steelmaking Facility
DOI:
https://doi.org/10.14529/power180308Keywords:
on-load tap changer, automatic voltage regulation of transformers, slow voltage deviation, electric arc furnace, electrical parameters of electric arc furnace, static var compensator reactive power compensationAbstract
The paper presents the main results of developing and researching a new principle for controlling the step-down transformer on-load tap changer (OLTC), which coordinates the OLTC operation with the electrical parameters of the electric-arc steelmaker, compensators installed in the high-power and ultrahigh-power EAF power supplies, and the mains. The proposed principle consists in pre-determining the operating voltage ranges on the mains-transformer primary side for all OLTC tap positions taking into account the existing of both
the electric-arc steelmaking facility and the mains. The static VAR compensator (SVC) control system is improved by adding a block for finding the mains-transformer OLTC tap position number so as to use new position-switching algorithms. The problem of optimizing the OLTC tap-position switching in mains-transformers supplying power to electric-arc steelmaking facilities under significant mains-voltage deviations is analyzed on the basis of evidence from three Russian steelworks companies. We herein discuss the particularities selecting the mains-transformer OLTC positions in two SVC control modes, one consisting in keeping zero consumption of reactive power from the mains, and the other one consisting in maintaining a coordinate voltage in the common EAF and SVC connection point. The effect of the proposed solutions is found from the results obtained
by means of mathematical modeling of electric-arc steelmaking facilities in MATLAB Simulink. We discuss the options for further improvement of principles for coordinating the operation of automatic transformer-voltage regulators (AVR) with the parameters of steelmakers, compensators, and mains.
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