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考虑全磁链补偿的DFIG高电压穿越控制策略

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当电网电压骤升时会引起双馈异步风力发电机(DFIG)内部定子磁链发生动态变化,造成传统矢量解耦控制性能变差.该文通过建立DFIG精确数学模型,对比分析得出与磁链有关的扰动项及耦合项,并据此对传统矢量解耦控制做出改进,提出一种利用全磁链进行补偿的控制结构,以提高风电系统高电压穿越(HVRT)能力.通过打破矢量定向限制,引入利用电流实测值直接计算得到的解耦项及与该文定义的补偿系数相乘的定子磁链补偿项,共同作为前馈补偿手段来修正电流内环指令值.仿真结果表明,提出的全磁链补偿控制策略能够在电网电压骤升时,实现对内部磁链变化的快速追踪,抑制电网电压突变带来的瞬时影响,加快振荡衰减速度,具备较好的暂态响应特性,有利于DFIG实现故障穿越.
High Voltage Ride-Through Control Strategy for DFIG Considering Full Magnetic Flux Linkage Compensation
When the power grid voltage surges,the stator flux changes dynamically in the doubly fed induction generator(DFIG),resulting in degraded performance of the traditional vector decoupling control.In this paper,by establishing the precise mathematical model of DFIG,the disturbance terms and coupling terms related to the flux are obtained through comparative analysis.Based on this,the traditional vector decoupling control is improved,and a control structure with full flux compensation is proposed to improve the high voltage ride through(HVRT)capability of the wind power system.By breaking the constraint of vector orientation,the decoupling term calculated directly from the measured current value and the stator flux compensation term multiplied by the compensation coefficient defined in this paper are introduced as feedforward compensation means to correct the instruction value of the inner current loop.The simulation results show that the proposed full flux compensation control strategy can quickly track the internal flux change when the power grid voltage surges,suppress the instantaneous influence caused by the power grid voltage sudden change,accelerate the oscillation attenuation speed,and have good transient response characteristics,which is conducive to DFIG to realize fault ride through.

DFIGHVRTprecise mathematical modelfull flux compensation

王艺霏、脱长军、赵世昌、甘嘉田、张宁、苏小玲

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国网青海省电力公司电力科学研究院,青海 西宁 810008

青海大学,青海 西宁 810016

双馈异步风力发电机 高电压穿越 精确数学模型 全磁链补偿

2024

电网与清洁能源
西北电网有限公司 西安理工大学水电土木建筑研究设计院

电网与清洁能源

CSTPCD北大核心
影响因子:1.122
ISSN:1674-3814
年,卷(期):2024.40(12)