基于数据驱动的背靠背柔性直流自适应广域阻尼控制

A Data Driven-based Adaptive Wide-area Damping Control for back to back VSC-HVDC

针对大型互联电网中可能存在的低频振荡问题,提出一种基于数据驱动的背靠背柔性直流输电系统自适应广域阻尼控制器(adaptive wide-area damping controller,A-WADC)。该A-WADC选取广域测量信号作为输入,同时调节柔性直流输电的有功和无功控制环。为了适应系统运行状态变化,采用基于数据驱动的目标表示的启发式动态规划算法进行控制器设计,无需受控系统的数学模型,仅根据系统输入输出数据信息便能设计控制器。此外,设计自适应时滞补偿器以有效补偿广域信号中存在的通讯时滞。以含背靠背柔性直流输电系统的实际电网等值简化模型为例进行仿真研究,仿真结果验证所提A-WADC在不同运行工况和不同通讯时滞下,均能有效抑制系统的低频振荡,改善系统的暂态稳定性。

This paper proposed a data driven-based adaptive wide-area damping controller(A-WADC)for back-to-back VSC-HVDC to suppress the low frequency oscillation in the large interconnected power system.The proposed A-WADC employs the wide-area measurement signals as input and adjust the active and reactive power control reference of VSC-HVDC simultaneously.The data driven-based goal representation heuristic dynamic programming was used to designed A-WADC to adapt to the change of operation conditions,which only requires the input and output data rather than the mathematic model of the controlled system.In addition,the adaptive delay compensator (ADC)was added for the A-WADC to effectively compensate the time-varying delays involved in wide area signal.Case studies were conducted under the equivalent simplified model of a practical power system with back-to-back voltage source converter based high voltage direct current transmission (VSC-HVDC).Simulation results verify that the proposed A-WADC can effectively suppress the low-frequency oscillation and improve the transient stability of the system under different,operating conditions and communication delays.