基于PMU的多馈入交直流系统的分散协调控制

针对广域多馈入交直流系统,为充分利用直流线路的快速调节能力以改善系统稳定性,提出一种分层分散鲁棒自适应控制方案。基于相角测量装置(PMU)测量单元,协调控制器在线确定并传送故障后动态平衡点到直流线路控制器,直流线路控制器以此故障后动态平衡点为控制目标。采用非线性递推方法推导了基于PMU的多馈入交直流系统的非线性鲁棒自适应分散协调控制规律,并设计了以动态平衡点和PMU实时测量的发电机功角信号为输入的直流线路附加功率控制器。最后通过3机2条直流的测试系统验证了该控制方案的有效性。

DECENTRALIZED COORDINATING CONTROL OF MULTI-INFEED AC/DC POWER SYSTEM BASED ON PMU

To improve the stability of a wide area multi-infeed AC/DC system, a two-level structure utilizing the quick response ability of HVDC is proposed. Based on phasor measurement unit (PMU), the dynamic stable equilibrium point (SEP) ascertained on line by an area coordinator is communicated to the dc line additional controllers as its control objective. By using the backstepping method, a nonlinear robust adaptive decentralized coordinating control law of multi-infeed AC/DC system is developed. This paper also discusses the design of dc line additional robust adaptive decentralized controller with the dynamic stable equilibrium point and generator phases measured by PMU as its input signals. A three-generator system including two HVDC lines is taken as an example to test the proposed control scheme and the simulation results demonstrate its effectiveness.