Coordinated Control for Large-Scale Wind Farms with LCC-HVDC Integration

Xiuqiang He, Hua Geng, Geng Yang and Xin Zou
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Xiuqiang He: Department of Automation, Tsinghua University, Beijing 100084, China
Hua Geng: Department of Automation, Tsinghua University, Beijing 100084, China
Geng Yang: Department of Automation, Tsinghua University, Beijing 100084, China
Xin Zou: State Power Economic Research Institute, State Grid Corporation of China, Beijing 102209, China

Energies, 2018, vol. 11, issue 9, 1-19

Abstract: Wind farms (WFs) controlled with conventional vector control (VC) algorithms cannot be directly integrated to the power grid through line commutated rectifier (LCR)-based high voltage direct current (HVDC) transmission due to the lack of voltage support at its sending-end bus. This paper proposes a novel coordinated control scheme for WFs with LCC-HVDC integration. The scheme comprises two key sub-control loops, referred to as the reactive power-based frequency ( Q - f ) control loop and the active power-based voltage ( P - V ) control loop, respectively. The Q - f control, applied to the voltage sources inverters in the WFs, maintains the system frequency and compensates the reactive power for the LCR of HVDC, whereas the P - V control, applied to the LCR, maintains the sending-end bus voltage and achieves the active power balance of the system. Phase-plane analysis and small-signal analysis are performed to evaluate the stability of the system and facilitate the controller parameter design. Simulations performed on PSCAD/EMTDC verify the proposed control scheme.

Keywords: HVDC; line commutated converter; wind farm; frequency stability; frequency control; voltage stability; voltage control; vector control; voltage-source converter (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: 2018
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