NDLI: A voltage-sag compensation scheme based on the concept of power quality control center

Content Provider	IEEE Xplore Digital Library
Author	Zhan, Y.Q. Choi, S.S. Vilathgamuwa, D.M.
Copyright Year	1986
Abstract	The role of the power quality control center (PQCC) in mitigating the impacts of voltage sags on sensitive loads is examined. The center consists of back-to-back power converters, a dc bus, and a fuel cell distributed generator (DG) connected to the dc bus. It is shown that the range of voltage sags the system can ride through is determined by the current rating of the PQCC input-side inverter. Therefore, a three-stage operation scheme is proposed to improve on the system voltage sag ride-through capability. Stage 1 functions by maintaining the dc-link voltage at the same level as that before the sag. The PQCC input-side inverter would be protected from overloading during sag mitigation. The fuel cell remains undisturbed under this stage. Stage 2 is designed for compensating more severe sags. The purpose of introducing this stage is to decrease the input-side current through reducing the active power supplied by the upstream system. This is achieved by reducing the dc-link voltage and forcing the fuel cell to supply the balance of the active power. It is shown that this strategy can compensate for a voltage deviation of up to approximately double that under Stage 1. For even more severe sags that cannot be compensated under Stage 2, the PQCC would reduce the dc-link voltage even further, such that the DG supplies the entire protected loads. Simulation results are used to illustrate the validity of the proposed control scheme.
Sponsorship	IEEE Power Engineering Society
Starting Page	296
Ending Page	304
Page Count	9
File Size	250662
File Format	PDF
ISSN	08858977
Volume Number	21
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power quality Voltage control Fuel cells Inverters Voltage fluctuations DC generators Distributed power generation Power generation Power system stability Power system protection voltage sag Distributed generator (DG) fuel cell power quality control center (PQCC)
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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