NDLI: Load-independent harmonic mitigation in SCR-fed three-phase multiple adjustable speed drive systems with deliberately dispatched firing angles

Content Provider	IET Digital Library
Author	Yang, Yongheng Davari, Pooya Blaabjerg, Frede Zare, Firuz
Abstract	Adjustable speed drives (ASD) are widely used in industry for energy savings, where low-cost diode rectifiers are still employed as the front-ends, also for simplicity in control and reliability in operation. However, significant harmonics appear at the grid, which should be tackled according to standards and/or grid-connection rules. If not, a poor power quality will cause the efficiency of the entire system drop. Currently, communication technologies are still not very cost-effective for industrial harmonic control in multiple parallel motor-drive systems. Therefore, this study proposes a harmonic mitigation strategy for multiple ASD systems, where silicon-controlled rectifiers (SCR) with boost converters in the dc-link have been adopted to increase the harmonic-current controllability. More specific, the SCR firing angles are deliberately dispatched among the drive units, which results in certain phase shifts of the SCR currents on purpose. Consequently, the harmonics appearing in the grid current can be mitigated to some extent without communication. The effectiveness is independent of an individual SCR system loading when a number of drives are connected. Simulations are carried out to verify the discussion. Furthermore, to maximize the harmonic cancellation, a customised modulation scheme has been experimentally demonstrated. Both simulation and experimental results have confirmed the analysis.
Starting Page	727
Ending Page	734
Page Count	8
ISSN	17554535
Volume Number	11
e-ISSN	17554543
Issue Number	Issue 4, Apr (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/11/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0815
Journal	IET Power Electronics
Publisher Date	2017-12-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	ASD System Boost Converter Diode Rectifier Drive Energy Savings Firing Angle Dispatching Grid-connection Rule Harmonic Cancellation Harmonic Control Harmonic Distortion Harmonic-current Controllability Harmonics Harmonics Suppression Load-independent Harmonic Mitigation Strategy Modulation Scheme Multiple Parallel Motor-drive System Power Converter Power Quality Power Semiconductor Device Power Supplies to Apparatus Power Supply Quality Reliability SCR-fed Three-phase Multiple Adjustable Speed Drive System Silicon Controlled Rectifier Silicon-controlled Rectifier Thyristors Variable Speed Drive
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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