基于AGC控制的HVDC线路线性化模型优化研究

Optimization research on linearization model of HVDC line based on AGC control

为了加强负荷频率控制和自动发电控制(AGC),对多区域电力系统中的高压直流(HVDC)联络线进行了精确建模,提出了一种新的联络线模型。在简单AGC系统基础上构建了一阶传递函数高压直流联络线模型,并通过时间常数反映了多区域电力系统在负荷扰动下直流输电设定直流电所需的时间。新构建的模型克服了传统HVDC模型响应不精确与结构简单不可靠的问题。为了验证模型的准确性,选择与传统直流输电模型进行了解析比较,结果表明:HVDC联络线模型具有良好的动态性能,多区域综合电力系统还实现了高压直流输电线路电容积累能量的电力系统互联互通。

In order to strengthen load frequency control and automatic generation control(AGC),the high voltage DC(HVDC)tie line in multi area power system was accurately modeled,and a new tie line model was proposed.Based on the simple AGC system,a first-order transfer function HVDC tie line model was constructed.The time required for DC transmission setting in multi area power system under load disturbance was reflected by time constant.The new model overcomedthe problems of inaccurate response and simple and unreliable structure of the traditional HVDC model.In order to verify the accuracy of the model,it was analyzed and compared with the traditional DC transmission model.The results showed that the HVDC tie line model hadgood dynamic performance.In addition,the multi regional integrated power system also realizedthe interconnection of power system with capacitor accumulated energy of HVDC transmission line.