为缓解高比例风电联网电力系统快速频率支撑策略参数整定难、功率等值分配易造成低风速机组转子动能释放过度而致失速的复杂问题,提出一种“集中响应+自主执行”模式下风电场自适应频率支撑控制策略。采用分层思想提出“集中响应+自主执行”模式的风电场频率支撑架构,上层考虑系统扰动动态补偿,基于自抗扰控制器模型搭建频率支撑策略,且针对自抗扰参数整定难的问题,挖掘不同线性自抗扰控制参数对快速频率支撑效果及风电机组运行状态的影响,提出基于粒子群优化算法的线性自抗扰控制器参数整定方法;下层考虑转速失速现象,对于风电场内不同风速风电机组一次调频功率分配的问题,提出通过转子转速自适应动态修正有功功率响应系数的整定方法,机组接收场站有功增量信号后结合有功功率响应系数自主响应快速频率支撑,实现“风电场集中响应+机组自主执行”的控制模式。以含风电场的四机两区系统进行仿真分析,仿真结果验证了所提控制策略对抑制风电机组转速失速的有效性以及频率支撑效果的可行性。
Abstract
In order to address the difficulty of parameter setting of fast frequency support strategy for high proportion wind power grid connected power system and the complex problem of stall caused by excessive release of rotor kinetic energy of low wind speed unit caused by power equivalent distribution, an adaptive frequency support control strategy for wind farm under the mode of “centralized response + autonomous execution” is proposed. For this purpose, a wind farm frequency support architecture of “centralized response + autonomous execution” mode is proposed by using the hierarchical idea. The upper layer considers the dynamic compensation of the system disturbance, and builds the frequency support strategy based on the auto-disturbance rejection controller model. Aiming at the difficulty of auto-disturbance rejection parameter tuning, the influence of different linear auto-disturbance rejection control parameters on the fast frequency support effect and the operating state of the wind turbine is explored, and a linear auto-disturbance rejection controller parameter tuning method based on particle swarm optimization algorithm is proposed. In the lower layer, considering the phenomenon of speed stall, for the problem of primary frequency regulation power distribution of wind turbines with different wind speeds in the wind farm, a setting method of adaptive dynamic correction of active power response coefficient by rotor speed is proposed. After receiving the active incremental signal of the station, the unit combines the active power response coefficient to respond independently to the fast frequency support, and realizes the control mode of “wind farm centralized response + unit autonomous execution”. A four-machine two-area system with wind farm is simulated and analyzed. The simulation results verify the effectiveness of the proposed control strategy to suppress the stall of the wind turbine speed and the feasibility of the frequency support effect.
关键词
风电场 /
调频 /
粒子群优化 /
参数整定 /
自抗扰控制 /
自适应动态补偿
Key words
wind farms /
frequency regulation /
particle swarm optimization /
parameter tuning /
active disturbance rejection control /
adaptive dynamic compensation
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基金
国家电网公司总部科技项目（5100-202306384A-2-3-XG）
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