基于超级电容的直驱风电机组一次调频策略  

Primary Frequency Modulation Strategy of Direct-driven Wind Turbine Based on Super Capacitor

作　　者：朱彦祥 蔺红[1] ZHUYanxiang;LIN Hong(School of Electrical Engineering,Xinjiang University,Urumqi 830017,Xinjiang,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830017

出　　处：《电气传动》2024年第12期25-32,共8页Electric Drive

基　　金：新疆维吾尔自治区重点研发专项资助项目(2022B01020-3)。

摘　　要：针对传统虚拟惯量控制下直驱风机调频能力不足的问题,提出了一种超级电容辅助直驱风机参与调频的控制策略,以提升风电接入后电网的频率稳定性。首先分析了直驱风机通过虚拟惯量控制参与调频时风机转速与输出功率对调频能力的影响,并通过Sigmoid函数建立了调频系数以表征其在不同运行状态下的调频能力。然后基于调频系数提出了一种风储调频策略:在直驱风机调频能力强时,由风机单独参与调频,而在调频能力弱时由风机与超级电容共同提供调频所需的功率,同时在超级电容的功率控制中引入充放电系数,避免其过充过放。最后通过仿真分析表明,所提策略的调频效果在直驱风机调频能力不足时较传统虚拟惯量控制有明显改善,且避免了超级电容的过充过放。Aiming at the problem of insufficient frequency modulation capability of direct-driven wind turbine under traditional virtual inertia control,a control strategy of super capacitor assists direct-driven wind turbine participating in frequency modulation was proposed to improve the frequency stability of power grid after wind power is connected.Firstly,the influence of the fan speed and output power on the frequency modulation capability when the direct-driven wind turbine participates in the frequency modulation through virtual inertia control is analyzed,and the frequency modulation coefficient was established through the Sigmoid function to characterize the frequency modulation capability of it under different operating conditions.Then,based on the frequency modulation coefficient,a frequency modulation strategy for wind storage was proposed,that is when the frequency modulation ability of direct-driven wind turbine is strong,the direct-driven wind turbine participates in the frequency modulation independently,while when the frequency modulation capability is weak,the power required for the frequency modulation is jointly provided by the direct-driven wind turbine and the super capacitor.At the same time,the charging and discharging coefficient was introduced into the power control of the super capacitor to avoid its over-charging and over-discharging.At last,the simulation results show that the proposed method is better than the traditional virtual inertia control when frequency modulation capability of the direct-driven wind turbine is insufficient,and it also avoids overcharging and discharging of super capacitor.

关 键 词：转子动能 超级电容 调频能力 风储联合 调频策略 

分 类 号：TM614[电气工程—电力系统及自动化]