用AGC实现稳定断面越限的预防和校正控制

提出将自动发电控制(Automatic Generation Control,AGC)与安全约束调度结合在一起,构成闭环控制系统,实现稳定断面越限的预防和校正控制.当稳定断面重载时,根据该断面有功功率相对于机组有功出力的灵敏度系数对机组出力的调节方向加以限制,防止由于AGC的正常调节导致重载程度的进一步加剧(简称预防控制);当稳定断面越限时,由安全约束调度提供校正控制策略,并在AGC控制下执行,自动完成解除越限的调节(简称校正控制).在江苏省调EMS中的实际工程应用表明,该方法可以有效地将稳定断面有功功率控制在允许范围内,保证电力系统的安全稳定运行.

Implementation of Preventive and Remedial Control for Tie Line Overload by Use of Automatic Generation Control

The authors propose that by integrating the automatic generation control (AGC) with security constrained dispatch (SCD) to constitute a closed-loop control system to implement the preventive and remedial control of tie line overload. When tie line is heavily loaded, according to the sensitivity coefficient of active power of tie line to active output of generating sets the adjusting directions of the units output are restricted to prevent the further aggravation of heavy load of tie line that is caused by normal adjustment of AGC. When the power flow of tie line exceeds the limit, the remedial control is provided by SCD and executed under the control of AGC to automatically complete the adjustment to relieve the overload of tie line. Actual application of the proposed method to the EMS in Jiangsu provincial dispatching center shows that this method can effectively keep the power flow of tie line within the permissive bounds and ensure the secure and stable operation of power system.