考虑频率二次跌落抑制的风火联合一次调频控制

A wind-thermal combination based primary frequency control scheme considering suppression of frequency second dip

风电作为一种主流的新能源,可通过释放转子中的旋转动能来辅助调频,但其转速恢复过程引发的频率二次跌落,对于如综合惯性控制这类技术的应用推广是潜在的挑战。为此,首先分析了风电综合惯性控制和转速恢复对系统频率响应的影响机理,并提出了一种风火联合一次调频控制方案。其中风电机组采用典型的综合惯性控制;风电机组启动转速恢复后,火电机组可根据就地测量的频率信号,动态调整出力以补偿转速恢复阶段风电引起的二次跌落功率缺额。通过基于MATLAB/Simulink的4机9节点系统,在不同风电渗透率下对所提方案的有效性进行了验证。

As a primary renewable energy source,wind power farm's frequency regulation can be realized by means of rotor kinetic energy releasing of wind turbine generator(WTG).However,the frequency second dip phenomenon arising from the rotor speed recovery of WTG will bring in potential challenge for the application of technique such as hybrid inertial control(VIC).in this paper,the mechanism in regard to how VIC improve system frequency response and how the rotor speed recovery affect frequency regulation is first presented.Then a wind-thermal combination based primary frequency control scheme is proposed.A hybrid inertia control of WTG.In the system level,thermal generators can dynamically adjust their power to compensate the power loss from the frequency second dip during WTGs*rotor speed recovery.A four-machine nine-bus system with a wind farm integrated with MATLAB/Simulink platform is used to test the effectiveness of the proposed control scheme under the circumstance of different wind penetration.