在线计算风电接入系统区域间功率传输极限对促进风电消纳、衡量系统稳定水平、挖掘输电潜力具有重要意义.目前,在线传输极限计算方法较为依赖离线仿真知识,该算法需要预先设定用于断面功率增长的控制方案,但这种控制方案无法适应实时变化的电网运行状态,导致在线传输极限计算结果偏离电网实际.在深入研究在线传输极限求解的基础上,提出了一种用于在线传输极限求解的输电断面功率增长模式的优化分析方法,来自动辨识对调整断面功率最有效的机组.该方法定义了一种断面综合灵敏度指标,用于表征电网中各类发电机对于断面有功功率传输过程的贡献程度;计算出断面综合灵敏度后,按照灵敏度大小对断面送受端系统中的发电机进行排序,将发电机划分为正灵敏度控制设备和负灵敏度控制设备;采用反向等量配对原则,在断面送端系统和受端系统中筛选出用于断面有功控制的可调设备集,计算出各发电机的有功控制量和调整方向,生成合理的断面功率增长模式方案.以某实际电网为例进行具体说明,其结论验证了利用所提方法求解在线传输极限的有效性.%Online Total Transfer Capability (TTC) has play an important role in many fields,such as wind power consume,directly estimate the stability of power system,enhance transmission power.This paper proposes an analysis method of active power control strategy of transmission interface,which identifies the most sensitive generator for transmission interfaces and decides control strategy of transmission interfaces active power automatically.It can improve accuracy of Online TTC which dependent on off-line simulation knowledge and could not automatically adapt real-time operation mode of power system.In this paper,a varible of integrative sensitivity of transmission interface is defined.Based on this varible,the method can calculate the adjustable margin and controlled priority of generator in power network,search the adjustable electric equipments for controlling transmission interfaces power,and provide control strategy for active power of transmission interfaces.The simulation analysis of actual grid verifies the effectiveness of the method.
展开▼
