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中文摘要：
风电高渗透率下,电力系统对风电场频率调节能力提出了技术要求。考虑风机惯性控制和变桨距控制的频率响应能力,提出将储能与风电自身调频手段相结合,参与系统频率调节。利用储能的柔性控制作用,弥补风电机组自身惯性控制时间短和变桨控制响应慢的不足,提高了电力系统频率稳定性。在风电场和储能系统频率特性模型的基础上,建立了风储联合调频下电力系统的频率特性模型,对比分析了风电调频、储能调频和风储联合调频下的电力系统频率特性,以及储能的容量配置需求。算例分析表明,风储联合调频需求的功率和容量仅为储能单独调频的67%和11.1%,降低了储能配置成本,提高了储能参与风电调频的经济可行性。
英文摘要：
The technical requirements of wind plant frequency regulation will be drafted by power system operators with its penetration level growing high. Considering frequency response capacity of wind turbine （WT） inertia control and pitch control, we presented a wind farm-energy storage combined frequency regulation （WSCFR） method which utilizes the flexible control characteristics of energy storage system （ESS） to complement the frequency regulation operation of WT. In such a way, the short duration of inertia control and slow response of pitch control can be avoided and the fre- quency stability of power grid can be improved. Firstly, we established the frequency characteristics models of the corresponding frequency regulation units, such as WT, ESS, and traditional generator units. Secondly, we set up the fre- quency characteristics model of power system with WSCFR. Finally, the power system frequency characteristic is comparatively analyzed with different frequency regulation method including WT based FR, ESS based FR, and WSCFR based FR along with ESS power and capacity requirements. Result verifies that power and capacity of WSCFR are 67% and 11.1% of only ESS frequency regulation, which reduces the cost of ESS and improves the economic feasibility of wind plants with ESS participating to frequency regulation.
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