电气化铁路接入风电汇集地区电网的负序优化补偿策略研究

随着我国西部地区风电场规模的不断增大且电源接入点稀少，导致牵引所和风电场的耦合度较高，电铁面临的负序问题更加严重。因此，计及双馈风电场的主动补偿能力，提出了一种电气化铁路接入风电汇集地区电网的负序优化补偿策略。首先，建立了电气化铁路牵引变电所和双馈风电场的负序阻抗模型，牵引变电所包括V/v接线牵引供电系统和静止无功发生器(static var generator, SVG)。其次，分析了V/v接线牵引供电系统的负序特性，推导了计及风电场主动补偿能力的负序传播模型。然后，给出了双馈风机(doubly-fed induction generator, DFIG)的剩余容量计算方法，提出了协同控制SVG与双馈风电场的负序优化补偿策略。最后，基于Matlab/Simulink仿真平台，验证了补偿策略的正确性和有效性。对比传统的电气化铁路负序补偿策略，该补偿策略能有效降低SVG实际补偿容量，提高装置运行年限。

A negative sequence optimization compensation strategy for an electrified railway connected to wind power integration areas

With the increasing scale of wind farms in the western region of China and the scarcity of power access points, resulting in higher coupling between the traction house and wind farms, the negative sequence problem faced by the electric railway has become more serious. Therefore, considering the active compensation capability of doubly-fed wind farms, a negative sequence optimization compensation strategy is proposed for an electrified railway connecting to the power grid in a wind power area. First, the negative sequence impedance models of an electrified railway traction substation and doubly-fed wind farm are established. The traction substation includes V/v connected TPSS and a static VAR generator (SVG). Second, the negative sequence characteristics of V/v connected TPSS are analyzed, and a negative sequence propagation model including active compensation capability of the wind farm is derived. Then, the remaining capacity calculation method of a doubly-fed induction generator (DFIG) is given. A negative sequence optimization compensation strategy for controlling SVG and DFIG collaboratively is proposed. Finally, based on the Matlab/Simulink simulation platform, the correctness and effectiveness of the compensation strategy are verified. Compared with the traditional negative sequence compensation strategy for an electrified railway, the strategy proposed in this paper can effectively reduce the actual compensation capacity of SVG and increase the operating life of the device.