考虑风速分区的风-储系统短期频率响应协同控制策略

在高风电渗透率电力系统中,针对双馈感应风电机组的转子转速与电网频率解耦所造成的机组惯性与频率响应能力缺失的问题,提出了基于模糊逻辑控制的风—储系统协同运行控制策略。该控制策略通过在风—储控制系统中嵌入模糊逻辑控制器来决策风—储系统响应电网频率波动的总有功出力和风力机转子动能的调频参与系数。基于此,根据不同风速下的风电机组运行特性将风速分区,并针对各风速区间构建了适应该区间转速—功率特点的风—储系统运行策略,使风—储系统具备能适应多种风况的短期频率响应能力。仿真结果表明:文中所提出的风—储系统协同运行控制策略能有效提升风—储系统的惯性以及短期频率响应能力,不仅能使风—储系统的短期频率响应能力适应多种风况,还可避免风电机组退出调频造成的频率二次跌落问题,同时改善了高风电渗透率电力系统的频率稳定性。

Coordinated Control Strategy for Short-term Frequency Response of Wind-Energy Storage System Considering Wind Speed Partition

In the power systems with high penetration rate of wind power, there exists the problem that inertia and frequency response ability caused by the decoupling of doubly-fed induction generator(DFIG)based wind turbine''s rotor speed with system frequency, a coordinated control strategy for a wind-energy storage system is put forward based on the fuzzy logic controllers. In this strategy, the fuzzy logic controllers are embedded in the wind-energy storage control system to determine the total active power output in response to the frequency fluctuation of power grid and the frequency-regulation participation coefficient of the kinetic energy of the DFIG''s rotor. Based on the above, the wind speed is partitioned according to the operation characteristics of DFIG under different wind speed conditions, and the operation strategies of wind-energy storage system in accordance with the wind speed zone is designed to enable the wind-energy storage system to have the short-term frequency response ability suitable for various wind conditions. The simulation results show that the proposed coordinated control strategy can effectively improve the inertia and the short-term frequency response ability, not only enabling the wind- energy storage system to adapt its short-term frequency response ability to various wind conditions, but also avoiding the second frequency drop. At the same time, the frequency stability of the power systems with high penetration rate of wind power is improved.