论文标题
基于MMC的MTDC系统的下垂控制斜率的稳定区域的估计
Estimation of Stability Regions of Droop Control Slopes for MMC-based MTDC Systems
论文作者
论文摘要
本文提出了一种计算方法，以有效，快速估计模块化多级转换器（MMC）基于多电位DC（MTDC）系统的下垂控制斜率的稳定区域。该方法基于一个一般的小信号模型，该模型由具有任意拓扑的直流网格和带有DQ控制器的MMC组成。通过系统方式开发的一般小信号模型可以用于小型扰动稳定性分析。为了验证开发的小信号模型，进行了MATLAB中计算的开发模型与PSCAD/EMTDC中模拟的详细开关模型之间的比较，这证明了开发的小信号模型的准确性。基于特征值的敏感性和泰勒的特征值系列，得出了一组不平等约束，并用于有效估计下垂特征的所有耦合斜率的稳定性区域。它有助于有效设计和调整MMC-MTDC系统的下垂控制器参数。该方法的有效性通过了几项考试，包括高级测试和稳定区域的素描，以进行准确性和可行性。
This paper proposes a computational method to efficiently and quickly estimate stability regions of droop control slopes for modular multilevel converter (MMC)-based multiterminal dc (MTDC) systems. The proposed method is based on a general small-signal model consisting of a dc grid with arbitrary topology and MMCs with dq controllers. The general small-signal model developed by a systematic way can be used for small-disturbance stability analysis. To verify the developed small-signal model, a comparison between the developed model calculated in MATLAB and the detailed switching model simulated in PSCAD/EMTDC is conducted, which demonstrates the accuracy of the developed small-signal model. Based on the eigenvalues sensitivity and the Taylor Series of eigenvalues, a set of inequality constraints are derived and used to efficiently estimate the stability regions of all coupled slopes of the droop characteristics. It is helpful for efficiently designing and adjusting the droop controller parameters for the MMC-MTDC systems. The effectiveness of the proposed method is demonstrated by the several examinations including the supremum test and the stability region sketch on accuracy and feasibility.
