The conventional distributed secondary control is widely adopted for distributed energy resources (DERs) in DC microgrids to achieve bus voltage restorations and output current/power sharing. However, when the DER systems are under cyber-attacks, the control variables of the conventional distributed secondary control will deviate from the nominal parameters and the stability of entire DC microgrids may not be guaranteed anymore. To this end, a distributed sliding mode observer (DSMO)-based secondary control is proposed in this paper. Based on local and neighboring measurements, the DSMO initially detects the false signals. Then, the estimated false signals are compensated by the control variables of the secondary control to eliminate the adverse impact. The stability of DSMO is verified by the convergence of the state variables. Both simulation and experimental results have validated that the proposed DSMO-based secondary control can effectively regulate the DER systems to track the bus voltage references and the desired output current/power under various types of cyber-attacks.

中文翻译：

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网络攻击下基于分布式滑模观测器的直流微电网二次控制

直流微电网中的分布式能源（DER）被广泛采用传统的分布式二次控制，以实现母线电压恢复和输出电流/功率共享。但是，当DER系统处于网络攻击状态时，常规分布式次级控制的控制变量将偏离标称参数，并且可能不再保证整个DC微电网的稳定性。为此，本文提出了一种基于分布式滑模观测器（DSMO）的二次控制。根据本地和邻近测量，DSMO最初会检测到虚假信号。然后，通过辅助控制的控制变量补偿估计的错误信号，以消除不利影响。通过状态变量的收敛来验证DSMO的稳定性。