Improved Frequency Control Strategy for Offshore Wind Farm Integration via VSC-HVDC

Rui Zeng and Yizhen Wang ()
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Rui Zeng: Key Laboratory of Smart Grid, Ministry of Education, Tianjin University, Tianjin 300072, China
Yizhen Wang: Key Laboratory of Smart Grid, Ministry of Education, Tianjin University, Tianjin 300072, China

Energies, 2022, vol. 15, issue 17, 1-11

Abstract: Voltage source converter based high voltage DC system (VSC-HVDC) has become a very promising solution to integrate offshore wind farm. However, the equivalent inertia of the modern power system with large renewable energy integration becomes small, which will arouse some frequency stability problems. To tackle this problem, this paper proposes an improved frequency regulation strategy for VSC-HVDC integrated offshore wind farm. Firstly, in the frequency decrease stage, the rotor kinetic energy of wind turbines (WTs) is used to suppress the decrease of the frequency, and the control parameters are determined to make full use of the mechanical power and rotor kinetic energy of WTs, the frequency nadir is improved. Secondly, in the rotor speed recovery stage, the DC capacitors of VSC-HVDC are used to release power to compensate the deficiency value of wind farm output power and avoid the secondary frequency drop (SFD) problem. Lastly, the simulation is conducted in PSCAD/EMTDC to validate the effectiveness of the proposed coordinated frequency control strategy.

Keywords: offshore wind farm; VSC-HVDC; kinetic energy; DC capacitor; frequency regulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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