Implementing Admittance Relaying for Microgrid Protection

An Incremental Negative Sequence Admittance Method for Fault Detection in Inverter-Based Microgrids

Superimposed sequence quantities have been relied on for years to provide pure fault components for various applications in protection schemes. In more recent times, they have been employed in various solutions to the challenges introduced by integration of distributed generation in distribution systems. To improve the overall reliability of protection schemes deployed in such active distribution networks, this paper evaluates a new approach for detecting unbalanced faults using negative sequence quantities. A proposed superimposed negative sequence admittance element is validated using simula…

Identification of Critical Clusters in Inverter-based Microgrids

In this paper, we investigate the stability properties of inverter-based microgrids by establishing the possible presence of the so-called critical clusters - groups of inverters with their control settings being close to the stability boundary. For this, we consider the spectrum of the weighted admittance matrix of the network and show that its distinct eigenvalues correspond to inverter clusters, whose structure can be revealed by the corresponding eigenvector. We show that the maximum eigenvalue of the weighted admittance matrix corresponds to the cluster, closest to stability boundary. We …

基于阻抗引导的逆变器调度指令操控攻击：面向电网稳定性的方法

Admittance-Guided Inverter Dispatch Command Manipulation Attack: A Grid Stability-Oriented Approach

本文提出一种基于阻抗引导的调度指令操控攻击方法，通过识别易受攻击的逆变器和最坏情况调度指令，以降低电网稳定性。

Identification and Stabilization of Critical Clusters in Inverter-Based Microgrids

A new method for stability assessment of inverter-based microgrids is presented in this paper. It leverages the notion of critical clusters -- a localized group of inverters with parameters having the highest impact on the system stability. The spectrum of the weighted network admittance matrix is proposed to decompose a system into clusters and rank them based on their distances from the stability boundary. We show that each distinct eigenvalue of this matrix is associated with one cluster, and its eigenvectors reveal a set of inverters that participate most in the corresponding cluster. The …

微电网负荷母线保护动态状态估计的实时实现

Real-Time Implementation of Dynamic State Estimation for Microgrid Load Bus Protection

针对逆变器接口微电网缺乏故障电流导致传统保护失效的问题，本文提出了一种基于参数估计和并行处理的动态状态估计实时保护方法，并在通用计算机上实现了低复杂度的实时应用。

Dynamic State Estimation for Load Bus Protection on Inverter-Interfaced Microgrids

Inverter-interfaced microgrids results in challenges when designing protection systems. Traditional time-overcurrent, admittance, and differential protection methods are unsuitable on account of lack of fault current, excessively short lines, or a prohibitive number of protective devices needing to be installed. Current practice is to force all inverters to shut down during fault conditions, weakening resilience and reducing reliability. Dynamic state estimation (DSE), which has been explored for both line protection and load bus protection before, is a potential solution to these challenges t…