海上风电柔直送出系统改进频率协同控制策略

张龙; 孙丹; 马志豪; 年珩

doi:10.19912/j.0254-0096.tynxb.2023-0908

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太阳能学报 ›› 2024, Vol. 45 ›› Issue (10) : 478-486. DOI: 10.19912/j.0254-0096.tynxb.2023-0908

海上风电柔直送出系统改进频率协同控制策略

张龙, 孙丹, 马志豪, 年珩

作者信息 +

IMPROVED FREQUENCY COORDINATED CONTROL STRATEGY FOR HVDC-INTEGRATED OFFSHORE WIND FARM

Zhang Long, Sun Dan, Ma Zhihao, Nian Heng

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文章历史 +

摘要

针对远海风场经柔直系统接入岸上电网后无法提供频率主动支撑的问题,该文提出一种远海风场与柔直系统改进频率协同控制方案。协同控制方案分为柔直系统层面和远海风场层面。针对柔直系统,将岸上电网的频率变化通过下垂控制转化为直流电压的变化,分析下垂控制系数与柔直系统虚拟惯量系数之间的关系,提出一种计及电网频率偏差的柔直系统自适应控制方法。针对远海风场,在频率故障前以最大化风电场转子动能为目标提出一种改进的功率备用方法,能有效减小风电场的风能损失并将该部分能量用于后续频率调节中,在频率故障后考虑风速差异根据转子转速实时调整风电机组频率控制系数,能在保证机组运行安全性的前提下提升风电场整体调频能力。仿真结果表明,所提控制方法在不同风速以及风电渗透率下均具有良好的调频性能。

Abstract

To address the problem that offshore wind farms （OWF） connected to the onshore grid by voltage source converter based high-voltage direct current （VSC-HVDC） cannot provide frequency active support, this paper proposes an improved frequency coordination control scheme between the offshore wind farms and the VSC-HVDC. The coordinated control scheme is divided into the level of the VSC station and the level of the offshore wind farms. For the VSC station, the frequency change of the onshore grid is transformed into the change of DC voltage through sag control, and the relationship between the sag control coefficient and the virtual inertia coefficient of the HVDC is analyzed, and then the virtual inertia coefficient is adjusted adaptively considering the index of grid frequency deviation. For the offshore wind farms, an improved power backup method is proposed with the objective of maximizing the rotor kinetic energy of wind farms before the frequency failure, which can effectively reduce the wind energy loss and use this part of energy for subsequent frequency adjustment. Considering the wind speed difference of wind turbines, the frequency control coefficients can be adjusted in real time according to rotor speed after the frequency failure. The proposed control strategy can improve the overall frequency regulation capacity of wind farms, while ensuring the safe and stable operation of the units. The simulation results show that the proposed control method has good frequency regulation performance at different wind speeds as well as wind power penetration rates.

导出引用

张龙, 孙丹, 马志豪, 年珩. 海上风电柔直送出系统改进频率协同控制策略[J]. 太阳能学报. 2024, 45(10): 478-486 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0908

Zhang Long, Sun Dan, Ma Zhihao, Nian Heng. IMPROVED FREQUENCY COORDINATED CONTROL STRATEGY FOR HVDC-INTEGRATED OFFSHORE WIND FARM[J]. Acta Energiae Solaris Sinica. 2024, 45(10): 478-486 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0908

中图分类号： TM614

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