Li Yanan, Cui Jianhui, Li Hongna, Zhao Bin
Maritime College, Tianjin University of Technology, Tianjin, China.
Tianjin Mingyang Wind Power Equipment Co., Ltd. Tianjin, China.
PLoS One. 2024 Dec 6;19(12):e0314226. doi: 10.1371/journal.pone.0314226. eCollection 2024.
Building a high-proportion renewable energy power system is a key measure to address the challenges of the energy revolution and climate change. However, current high-proportion renewable energy systems face issues of frequency instability and voltage fluctuations. To address these challenges, this paper proposes a novel topology for a stator free speed regulating wind turbine generation system. The stator free speed regulating machine connects a gearbox and a synchronous generator, forming a flexible drive chain that increases system inertia and enhances frequency stability in high-proportion renewable energy power systems. The synchronous generator at the end of the drive chain can be directly connected to the grid without the converter, thanks to the speed regulation provided by the stator free speed regulating machine, thus avoiding harmonic pollution caused by power electronic devices in traditional wind turbines, enhancing the reactive power support capability, and improving voltage stability in high-proportion renewable energy systems. Given that the proposed stator free speed regulating machine consists solely of a rotating inner and outer rotor without a stator, traditional motor control strategies are not applicable. Therefore, this paper focuses on developing control strategies for the stator free speed regulating machine, employing a dual closed-loop PI control strategy with an outer loop for speed and an inner loop for current, based on flux orientation of the outer rotor. Simulation experiments will validate the feasibility of the proposed stator free speed regulating wind turbine generation system topology and the effectiveness of the control strategy.
构建高比例可再生能源电力系统是应对能源革命和气候变化挑战的关键举措。然而，当前的高比例可再生能源系统面临频率不稳定和电压波动等问题。为应对这些挑战，本文提出了一种新型的无定子调速风力发电机组系统拓扑结构。无定子调速电机连接齿轮箱和同步发电机，形成了一个灵活的传动链，可增加系统惯性并提高高比例可再生能源电力系统的频率稳定性。由于无定子调速电机提供的调速功能，传动链末端的同步发电机无需通过变流器即可直接接入电网，从而避免了传统风力发电机中电力电子设备造成的谐波污染，增强了无功功率支持能力，并提高了高比例可再生能源系统中的电压稳定性。鉴于所提出的无定子调速电机仅由旋转的内转子和外转子组成，没有定子，传统的电机控制策略并不适用。因此，本文重点研究无定子调速电机的控制策略，基于外转子的磁链定向，采用速度外环和电流内环的双闭环PI控制策略。仿真实验将验证所提出的无定子调速风力发电机组系统拓扑结构的可行性以及控制策略的有效性。
