风电机组故障穿越与频率调节风储联合控制策略研究

Research on the Wind Power-storage Joint Control Based on Fault Ride-through and Frequency Regulation of Wind Turbine

风电场因故障切机脱网频繁导致大停电事故,暴露出风电机组在故障穿越以及主动调频两方面能力的不足,但少有文献同时兼顾这两种需求进行综合研究分析。文中针对直驱风电机组,在故障穿越与频率调节的原理和需求分析基础上,提出一种基于旋转备用加直流侧储能的风储联合控制策略,利用风轮机机械动能提供虚拟惯量支撑,超级电容储能实现一次调频和故障穿越;并依据行业标准,定量分析故障和扰动期间的功率调节公式及参数设计,通过逻辑控制原则实现多运行模式切换。该策略在只增加储能的基础上,带来了机组多方面的性能提升:保证了高/低电压穿越期间的有功平衡,满足优先向电网提供动态无功以支撑电压恢复;同时有效解决了传统调频策略中频率的二次跌落、预留备用的电能浪费,调节裕度不足等问题,从而整体上提升风机运行稳定性和经济性。通过仿真系统验证策略的优良特性。

The frequent occurrence of blackouts due to wind farms-off grid has exposed the shortcomings of wind turbine in fault ride through and active participation in frequency regulation. However, there are few literatures that comprehensively analyze these two requirements simultaneously. Based on the analysis of the principle and demand of fault ride through and frequency regulation, this paper proposed a joint control of wind power-storage based on rotating reserve and DC side energy storage, which used the mechanical kinetic energy of wind turbine to provide virtual inertia support, super capacitor to realize primary frequency regulation and fault ride through. According to the industry standard, the power regulation formula and parameter design during fault and disturbance were analyzed quantitatively, and multi operation mode switching was realized by logic control principle. On the basis of only increasing the energy storage, this strategy has brought many performance improvements to the unit. It ensures the active power balance during the HVRT/LVRT and satisfies the priority of providing dynamic reactive power to the grid to support the voltage recovery. Also, at the same time, it effectively solves the problems such as the second drop of frequency, the waste of reserve capacity, and the lack of regulation margin in the traditional strategy, so as to improve the overall operation stability and economy of the PMSG. Finally, the strategy is verified by simulation.