直流微电网分布式弹性二次电压恢复与电流分配控制

Distributed Resilient Secondary Voltage Restoration and Current Distribution Control of DC Microgrid

相比于传统的集中式控制,微电网的分布式控制具有更高的灵活性和可拓展性。但是,分布式控制缺少用于监视发电单元运行的中央控制器。当攻击者对测量数据进行恶意篡改并输入控制器时,系统并不能有效地检测,其仍以错误控制信号进行系统控制,这将影响控制精度,甚至破坏系统的稳定性。为解决上述问题,文中提出了一种基于中间观测器的分布式弹性二次电压恢复控制方法。当孤岛直流微电网控制器受到虚假数据注入攻击时,该控制方法能对攻击信号进行有效观测并对系统进行补偿。实验结果表明,在系统受到时变虚假数据注入攻击时,该方法能够实现电压恢复及电流精确分配。

Compared to the traditional centralized control, the distributed control for microgrids offers higher flexibility and scalability. But the distributed control is short of a central controller for monitoring operation of generation units. When attackers maliciously tamper with measured data and input the controllers, the system cannot effectively detect it, and the fault control signal is still used for system control, which affects the control accuracy and even destroys the stability of the overall system. To solve the above problems, this paper proposes a control method of distributed resilient secondary voltage restoration based on an intermediate estimator. When the controller of islanded DC microgrids is under FDI attack, the control method can effectively observe the attack signal and compensate it in the system. The experimental results verify that when the system is under the timevarying FDI attack, the proposed method can achieve voltage restoration and current accurate distribution.