论文标题
基于观察者的复合标识符，用于在线估算电源系统的等效参数
An Observer-Based Composite Identifier for Online Estimation of the Thevenin Equivalent Parameters of a Power System
论文作者
论文摘要
我们考虑了一个等效电路，该电路从通用耦合与功率电子转换器的点可以捕获电网的动力学，并为在线识别相应电路参数的在线识别提供了解决方案。为此，我们首先在常规ABC坐标中得出一个线性回归模型，并下一个设计基于有限观察者的复合标识符，该标识符仅需要局部测量和仅了解网格频率。进一步提供了一个保证估计值的指数收敛的扩展，并在对电网X/R比的知识的附加假设下进行了进一步的扩展。通过详细的计算机模拟说明了所提出的标识符的性能，该标识符包含常规梯度下降算法。
We consider a Thévenin equivalent circuit capturing the dynamics of a power grid as seen from the point of common coupling with a power electronic converter, and provide a solution to the problem of online identification of the corresponding circuit parameters. For this purpose, we first derive a linear regression model in the conventional abc coordinates and next design a bounded observer-based composite identifier that requires local measurements and knowledge of the grid frequency only. An extension that guarantees exponential convergence of the estimates, under the additional assumption of knowledge of the grid X/R ratio, is further provided. The performance of the proposed identifier, which subsumes a conventional gradient descent algorithm, is illustrated via detailed computer simulations.
