skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Active dc filter for HVDC systems

Abstract

This article is a case history of the installation of active dc filters for high-performance, low-cost harmonics filtering at the Lindome converter station in the Konti-Skan 2 HVDC transmission link between Denmark and Sweden. The topics of the article include harmonics, interference, and filters, Lindome active dc filter, active dc filter design, digital signal processor, control scheme, protection and fault monitoring, and future applications.

Authors:
 [1];
  1. (Royal Inst. of Tech., Stockholm (Sweden))
Publication Date:
OSTI Identifier:
5169483
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Computer Applications and Power; (United States); Journal Volume: 7:1
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; HVDC SYSTEMS; HARMONICS; POWER CONDITIONING CIRCUITS; ELECTRICAL TRANSIENTS; INVERTERS; DC SYSTEMS; ELECTRICAL EQUIPMENT; ELECTRONIC CIRCUITS; ENERGY SYSTEMS; EQUIPMENT; OSCILLATIONS; POWER SYSTEMS; TRANSIENTS; VOLTAGE DROP; 240202* - Power System Networks, Transmission & Distribution- DC Systems- (1990-)

Citation Formats

Zhang, W., and Asplund, G. Active dc filter for HVDC systems. United States: N. p., 1994. Web. doi:10.1109/67.251312.
Zhang, W., & Asplund, G. Active dc filter for HVDC systems. United States. doi:10.1109/67.251312.
Zhang, W., and Asplund, G. 1994. "Active dc filter for HVDC systems". United States. doi:10.1109/67.251312.
@article{osti_5169483,
title = {Active dc filter for HVDC systems},
author = {Zhang, W. and Asplund, G.},
abstractNote = {This article is a case history of the installation of active dc filters for high-performance, low-cost harmonics filtering at the Lindome converter station in the Konti-Skan 2 HVDC transmission link between Denmark and Sweden. The topics of the article include harmonics, interference, and filters, Lindome active dc filter, active dc filter design, digital signal processor, control scheme, protection and fault monitoring, and future applications.},
doi = {10.1109/67.251312},
journal = {IEEE Computer Applications and Power; (United States)},
number = ,
volume = 7:1,
place = {United States},
year = 1994,
month = 1
}
  • The purpose of introducing active dc filters is to meet the more and more stringent requirement from power utilities on limiting telephone interference caused by harmonic currents from HVdc transmission lines, without unnecessarily increasing the cost of HVdc stations. An active dc filter installed in the Konti-Skan HVdc link is described. The active dc filter is connected at the bottom of an existing passive dc filter at the Lindome station. The active dc filter includes optic harmonic current measuring unit, control system, protection and supervision system, PWM power amplifier, high-frequency transformer, surge arrester, and coupling apparatuses. The active dc filtermore » has small physical size and occupies small ground area. The performance of the active dc filter for eliminating the disturbing harmonics is excellent. To achieve comparable results by passive filters would require something like ten times more high voltage equipment.« less
  • The paper investigates the use of a novel filter arrangement for eliminating harmonic instability. The CIGRE benchmark model is selected as the base system. Presented in the paper is an example of harmonic instability which is first eliminated using a conventional low Q filter. Subsequently an energy recovery filter (ER-filter) replaces the conventional low Q filter. It is shown that the ER-filter provides similar performance with a fraction of the power loss when compared with a low Q filter. The dynamic performance of the ER-filter is also demonstrated via the simulations of system start-up and faults. The tool used formore » this investigation is an electromagnetic transient simulation program.« less
  • Coordinated active and reactive power modulation is evaluated for centralized and decentralized DC power modulation. Linear analysis and simulation studies are made for different DC network configurations. Simulation studies made on a hybrid computer demonstrate that coordinated reactive power modulation not only improves the system damping but it also alleviates the mode shifting problem during the modulation.
  • This paper deals with a shunt active filter which will be installed by an electric utility, putting much emphasis on the control strategy and the best point of installation of the shunt active filter on a feeder in a power distribution system. The objective of the shunt active filter is to damp harmonic propagation, which results from harmonic resonance between many capacitors for power factor improvement and line inductors in the feeder, rather than to minimize voltage distortion throughout the feeder. Harmonic mitigation is a welcome ``by-product`` of the shunt active filter, which comes from damping of harmonic propagation. Thismore » paper concludes that the shunt active filter based on detection of voltage at the point of installation is superior in stability to others, and that the best site selection is not the beginning terminal but the end terminal of the primary line in the feeder. Computer simulation is performed to verify the validity and effectiveness of the shunt active filter by means of an analog circuit simulator, which is characterized by installing it on a feeder of a radial distribution system in a residential area.« less
  • Measurements of harmonic currents in the New England-Hydro-Quebec Phase I HVDC Project de transmission line are presented in this paper. Measurements were conducted to determine the cause of increased telephone interference and to evaluate the dc filter performance. The measurements revealed unexpected high levels of 3-pulse harmonic currents in the dc pole conductors. The cause is attributed to imbalances within the 6-pulse bridges caused by the converter transformer and valve stray capacitances to ground. The conventional model of the converter power circuit used as the basis for the dc filter design does not reproduce the measured 3-pulse harmonics. Modification tomore » this model is required to account for the effect of the converter transformer and valve stray capacitances to ground.« less