Steady-state voltage-control method considering large-scale wind-power transmission using half-wavelength transmission lines

• Main Authors: Hao Tian, Hongzheng Liu, Huan Ma, Pengfei Zhang, Xiaohui Qin, Changhui Ma
• Format: Article
• Language: English
• Published: KeAi Communications Co., Ltd. 2021-06-01
• Series: Global Energy Interconnection
• Subjects: Half-wavelength lines; Secondary voltage control; Wind-power transmission; Reactive power regulation
• Online Access: http://www.sciencedirect.com/science/article/pii/S2096511721000700

Half-wavelength transmission can transmit large-scale renewable energy over very long distances. This paper proposes an improved steady-state voltage-control method for half-wavelength transmission systems considering large- scale wind-power transmission. First, the unique voltage characteristics of half-wavelength lines are deduced based on the distributed parameter model. In the secondary voltage-control level, reactive power-transmission limits of half-wavelength lines are introduced as another control objective except for tracing the pilot bus voltage reference. Considering the uncertainty and fluctuation of wind power, the overvoltage risk-assessment method of half-wavelength lines is presented to determine specific voltage-control strategies. Simulation results demonstrate that the proposed voltage-control method delivers superior tracking performance according to a voltage reference value and prevents the overvoltage risk of half- wavelength lines effectively in different wind-power penetrations.