基于超导储能装置的联络线功率控制

Control of Tie-line Power Flow by Nonlinear Robust SMES Controller

改变了以往将超导储能装置安装在发电机出口处的策略,利用该装置与系统间有功和无功功率交换的灵活性,进行互联系统联络线的功率控制。控制目标由传统的驱使系统恢复到故障前的稳定运行点,转为跟踪系统惯量中心,以较小的控制代价尽快将系统拉回同步,并迅速平息故障后的区域间功率振荡。利用反步法为超导储能装置的有功环节设计了鲁棒控制器,使闭环系统对建模误差及有界的外部扰动具有鲁棒性。最后利用PSS/E对所提出的控制方案在4机2区系统上进行了数字仿真,证明了该方案的有效性。

A new control strategy for superconducting magnetic energy storage （SMES） is presented. The control strategy fully utilizes the flexibility of SMES in exchanging active and reactive power with power systems in four quadrants to control tie-line power flow. The objective is to synchronize centre of inertial of sending and receiving subsystems under transient conditions and quickly damp post-fault inter-area oscillation. Back-stepping method is used to derive control law for active power output of SMES. Proportional control is used for reactive power output of SMES. The designed controller is robust to model errors and bounded external disturbances. Computer test results on a four-machine two-area system demonstrate that the presented controller can effectively damp inter-area oscillation of power systems.