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Energies 2015, 8(3), 1644-1662; doi:10.3390/en8031644

Research on Shaft Subsynchronous Oscillation Characteristics of Parallel Generators and SSDC Application in Mitigating SSO of Multi-Generators

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Author to whom correspondence should be addressed.
Academic Editor: Neville R. Watson
Received: 10 November 2014 / Revised: 4 January 2015 / Accepted: 9 February 2015 / Published: 27 February 2015
(This article belongs to the Collection Smart Grid)
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Abstract

Subsynchronous oscillation (SSO) of generators caused by high voltage direct current (HVDC) systems can be solved by applying supplemental subsynchronous damping controller (SSDC). SSDC application in mitigating SSO of single-generator systems has been studied intensively. This paper focuses on SSDC application in mitigating SSO of multi-generator systems. The phase relationship of the speed signals of the generators under their common mechanical natural frequencies is a key consideration in SSDC design. The paper studies in detail the phase relationship of the speed signals of two generators in parallel under their shared mechanical natural frequency, revealing regardless of whether the two generators are identical or not, there always exists a common-mode and an anti-mode under their common natural frequency, and the phase relationship of the speed signals of the generators depends on the extent to which the anti-mode is stimulated. The paper further demonstrates that to guarantee the effectiveness of SSDC, the anti-phase mode component of its input signal should be eliminated. Based on the above analysis, the paper introduces the design process of SSDC for multi-generator systems and verifies its effectiveness through simulation in Power Systems Computer Aided Design/Electromagnetic Transients including Direct Current (PSCAD/EMTDC). View Full-Text
Keywords: subsynchronous oscillation (SSO); supplemental subsynchronous damping controller (SSDC); multi-generator system; shaft oscillation characteristic; common-mode; anti-mode subsynchronous oscillation (SSO); supplemental subsynchronous damping controller (SSDC); multi-generator system; shaft oscillation characteristic; common-mode; anti-mode
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, S.; Xu, Z. Research on Shaft Subsynchronous Oscillation Characteristics of Parallel Generators and SSDC Application in Mitigating SSO of Multi-Generators. Energies 2015, 8, 1644-1662.

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