A Coordinated Control Strategy for LCC HVDC Systems for Frequency Support with Suppression of AC Voltage Fluctuations

In this paper, a new control method for a line-commutated converter-based (LCC) high-voltage direct current (HVDC) system to support the frequency and AC voltage was proposed. For coordinated control of the inverter and rectifier, droop-based controllers are adopted for the outer loop of conventiona...

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Bibliographic Details
Published inIEEE transactions on power systems Vol. 35; no. 4; pp. 2804 - 2815
Main Authors Lee, Gyu-Sub, Kwon, Do-Hoon, Moon, Seung-Il, Hwang, Pyeong-Ik
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Controllers
Converters
DC voltage regulation
Direct current
Droop control
Frequency control
Frequency measurement
HVDC transmission
Information transfer
Inverters
line-commutated converter-based (LCC) HVDC
Reactive power
Risk communication
Root locus
Stability analysis
State space models
System reliability
Voltage control
Voltage measurement
Voltage stability
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Summary:In this paper, a new control method for a line-commutated converter-based (LCC) high-voltage direct current (HVDC) system to support the frequency and AC voltage was proposed. For coordinated control of the inverter and rectifier, droop-based controllers are adopted for the outer loop of conventional controllers, and DC voltage is used to transfer the frequency information so that communication is not required. A method to determine the droop constants of the proposed controller is presented to emulate the conventional <inline-formula><tex-math notation="LaTeX">f</tex-math></inline-formula>/<inline-formula><tex-math notation="LaTeX">P</tex-math></inline-formula> droop characteristic and suppress the AC voltage fluctuations. Furthermore, a small-signal state-space model of the LCC HVDC system with the proposed scheme is derived, and root locus analysis is carried out to evaluate its stability. The effects of the proposed method are verified based on case studies, using the well-known CIGRE BENCHMARK model. The advantages of the proposed method can be summarized as follows: 1) system reliability is enhanced because there is no risk of communication failure during frequency information transfer and 2) voltage stability at the inverter side is enhanced as AC voltage fluctuation during frequency support is minimized.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2020.2964336