The Coordinated Control Strategy for Generator-Transformer's Voltage Regulation

Abstract:

Nowadays the main electrical wiring in medium-size and large-size thermal power units is mostly unit wiring. In the quarter of small reactive power load, some generators need to work in phase-lag operation during the daytime and in phase-advancement operation at night to meet the demand of voltage quality of their plant’s high-voltage side. This operation, however, will lower the voltage of auxiliary power and do harm to system’s stability. This paper proposes a kind of coordinated control strategy for generator-transformer’s voltage regulation. In this strategy, the main transformer should be on-load tap charger and the controller regulate the generator voltage and transformation ratio simultaneously when needed, thus the voltage quality of both high-voltage side and auxiliary power side can be insured and the generator no longer work in phase-advancement operation. This control strategy can be a meaningful proposal for AVC in smart grid in the future. Simulation result shows the stability and reliability of the proposed control strategy.

• Periodical: Advanced Materials Research (Volumes 960-961)
• Pages: 1128-1133
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.960-961.1128
• Online since: June 2014
• Authors: Yu Ze Zhang*, Wen Ying Liu, Shu Xin Li, Wei Zhou Wang, Fu Chao Liu, Jing Jing Zheng
• Keywords: Coordinated Control, Excitation Control, OLTC, Phase-Advancement Operation, Smart Grid (SG)

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