Stability Analysis and Stabilization Methods of DC Microgrid With Multiple Parallel-Connected DC–DC Converters Loaded by CPLs
Stability Analysis and Stabilization Methods of DC Microgrid With Multiple Parallel-Connected DC–DC Converters Loaded by CPLs
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DOI：
10.1109/tsg.2016.2546551
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发表时间：
2018
影响因子：
9.6
通讯作者：
M. Su;Zhangjie Liu;Yao Sun;Hua Han;Xiaochao Hou
中科院分区：
文献类型：
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作者：
M. Su;Zhangjie Liu;Yao Sun;Hua Han;Xiaochao Hou
由于众所周知的负阻抗特性，恒定功率负载可能产生不稳定性。本文分析了多个直流-直流变换器组成的直流微电网不稳定的原因。针对恒压源模式和下垂模式两种运行模式提出了两种稳定方法，并通过识别雅可比矩阵的特征值得到了直流微网稳定的充分条件。关键是将特征值问题转化为二次特征值问题。在实际工程应用中，该方法的显著特点是可以根据电容、电感、最大负载功率和电缆距离等约束条件来估计稳定参数域。与一些经典方法相比，所提出的方法具有更宽的稳定区域。基于MATLAB/simulink平台的仿真结果验证了该方法的可行性。
Constant power loads may yield instability due to the well-known negative impedance characteristic. This paper analyzes the factors that cause instability of a dc microgrid with multiple dc–dc converters. Two stabilization methods are presented for two operation modes: 1) constant voltage source mode; and 2) droop mode, and sufficient conditions for the stability of the dc microgrid are obtained by identifying the eigenvalues of the Jacobian matrix. The key is to transform the eigenvalue problem to a quadratic eigenvalue problem. When applying the methods in practical engineering, the salient feature is that the stability parameter domains can be estimated by the available constraints, such as the values of capacities, inductances, maximum load power, and distances of the cables. Compared with some classical methods, the proposed methods have wider stability region. The simulation results based on MATLAB/simulink platform verify the feasibility of the methods.