双馈风电系统连接柔直电网电压频率协调控制策略
摘要：针对连接柔性直流输电的双馈风力发电系统，提出一种基于转子侧换流器与直流电网侧换流器的协调控制策略，使得定子频率及定子电压随着风速变化都在一个较宽范围内变化，实现双馈风力发电机的高效运行。在传统的双馈风力发电机组连接柔性直流输电的拓扑结构下，对单台1.5 MW双馈风力发电机组宽范围电压频率协调控制策略进行了仿真实验，当风速变化时，通过控制直流电网侧换流器相应地调整定子电流频率，同时控制转子侧换流器磁链环使定子磁链保持不变，使得定子电压也同比例变化，从而在全风速范围内都能降低双馈电机的铁损耗。仿真结果表明在全风速范围内均可实现宽范围电压频率协调控制策略，且双馈电机的整体效率相比于恒压恒频控制策略得到很大提高。
Abstract:In allusion to the doubly-fed wind power generation system connected with flexible HVDC transmission grid, a coordinated control strategy based on rotor side converter and HVDC grid side converter, which made the stator frequency and stator voltage changed with wind speed in a wider range, was proposed, to implement high efficient operation of doubly-fed wind power generator. Under the scene of traditional topology, by which a traditional doubly-fed wind power generation set was connected with flexible HVDC transmission grid, the simulation of the wide range voltage-frequency coordinated control strategy of a single 1.5 MW doubly-fed wind power generation set was conducted. When the wind speed varied, by means of controlling the converter at HVDC grid side the frequency of stator current was correspondingly adjusted, at the same time, the rotor side converter magnetic chain loop was controlled to make the stator magnetic chain kept constant, thereby, the stator voltage varied in the same proportion, thus within the full wind speed range the iron loss of the doubly-fed wind turbine could be decreased. Simulation results show that within the full wind speed range the wide-range voltage and frequency coordinated control strategy can be realized, besides, comparing with constant voltage and constant frequency control strategy the overall efficiency of doubly-fed wind power generation set can be evidently improved.
标题：双馈风电系统连接柔直电网电压频率协调控制策略
英文标题：A Coordinated Control Strategy of Voltage and Frequency for Doubly-fed Wind Power Generation System Connected to Flexible HVDC Grid
作者：崔学深, 罗慧达, 刘其辉, 刘勇鑫, 汤海雁, 申旭辉,
关键词：宽范围电压频率协调控制, 高效运行, 双馈风力发电机, 柔性直流输电,
发表日期：2023-08-10
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