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Appl. Sci. 2018, 8(8), 1350;

Novel Transient Power Control Schemes for BTB VSCs to Improve Angle Stability

School of Electrical Engineering, Korea University, Anam-ro, Sungbuk-gu, Seoul 02841, Korea
Korea Electric Power Corporation (KEPCO), Naju-si, Jeollanam-do, 58322, Korea
Author to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 7 August 2018 / Accepted: 8 August 2018 / Published: 11 August 2018
(This article belongs to the Special Issue HVDC for Grid Services in Electric Power Systems)
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This paper proposes two novel power control strategies to improve the angle stability of generators using a Back-to-Back (BTB) system-based voltage source converter (VSC). The proposed power control strategies have two communication systems: a bus angle monitoring system and a special protection system (SPS), respectively. The first power control strategy can emulate the behaviour of the ac transmission to improve the angle stability while supporting the ac voltage at the primary level of the control structure. The second power control scheme uses an SPS signal to contribute stability to the power system under severe contingencies involving the other generators. The results for the proposed control scheme were validated using the PSS/E software package with a sub-module written in the Python language, and the simple assistant power control with two communication systems is shown to improve the angle stability. In conclusion, BTB VSCs can contribute their power control strategies to ac grid in addition to offering several existing advantages, which makes them applicable for use in the commensurate protection of large ac grid. View Full-Text
Keywords: BTB-HVDC; power control; angle stability; special protection system BTB-HVDC; power control; angle stability; special protection system

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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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MDPI and ACS Style

Song, S.; Hwang, S.; Ko, B.; Cha, S.; Jang, G. Novel Transient Power Control Schemes for BTB VSCs to Improve Angle Stability. Appl. Sci. 2018, 8, 1350.

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