Xiuqiang He

Ultrafast grid impedance identification in dq-asymmetric three-phase power systems

Mohamed Abdalmoaty, Verena Häberle, Xiuqiang He, Florian Dörfler

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Frequency and Voltage Independent Stability Conditions for Grid-Forming Devices

Hongyang Qing, Xiuqiang He, Hua Geng

This letter presents a model-decomposition method that derives frequency and voltage independent stability conditions for grid-forming (GFM) devices, enabling separate stability requirements for frequency and voltage components under grid interactive conditions. To this end, a GFM device-grid interconnected system is decomposed into …

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Quantifying Power Disturbance Tolerance to Guarantee Voltage Security in DC Microgrids

Zelin Sun, Xiuqiang He, Shanshan Jiang, Xiaoyu Peng et autres

This letter addresses the challenge of maintaining voltage security in DC microgrids (DCMGs) under persistent stochastic power disturbances. Conventional equilibrium stability analysis is insufficient for this purpose, as it does not ensure security bounds are respected during a dynamic response process. We …

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How to Tailor Power-Electronic Inertia to the Constraints of Its Resource

Walter Schittek, Nils Wiese, Christian Hachmann, Xiuqiang He et autres

In recent years, research on power-electronic contributions of inherent inertia via grid-forming (GFM) control schemes has made significant progress. But several technical hurdles still stand against major progress towards an optimized use of resources and minimized cost on the way of providing …

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Decision-Making of GFM/GFL Capacity Ratio: Ensuring Small-Signal and Frequency Stability

Honghai Liu, Xiuqiang He, Hongyang Qing, Qiu Chunmiao et autres

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Stability-Domain-Based Transient Stability Analysis of Grid-Forming and Grid-Following Hybrid Converter Systems

Ming Li, Rui Zhang, Hua Geng, Xiuqiang He et autres

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A Graph-Theoretic Approach for Ensuring Stability in DC Microgrid Networks During Mode Switching

Shanshan Jiang, Zelin Sun, Jiankun Zhang, Ming Zhang et autres

This paper proposes a graph-theoretic approach to ensure stability in networked DC microgrids (DCMGs) during mode switching. This method addresses voltage instability that occurs during mode switching from one mode to another scheduled by the upper-level energy management of the microgrid network. …

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Dispatchable Current Source Virtual Oscillator Control Achieving Global Stability

Kehao Zhuang, Linbin Huang, Huanhai Xin, Xiuqiang He et autres

This work introduces a novel dispatchable current source virtual oscillator control (dCVOC) scheme for grid-following (GFL) converters, which exhibits duality with dispatchable virtual oscillator control (dVOC) in two ways: a) the current frequency is generated through reactive power control, similar to a …

Quantifying Grid-Forming Behavior: Bridging Device-Level Dynamics and System-Level Strength

Kehao Zhuang, Huanhai Xin, Verena Häberle, Xiuqiang He et autres

Grid-forming (GFM) technology is widely regarded as a promising solution for future power systems dominated by power electronics. However, a precise method for quantifying GFM converter behavior and a universally accepted GFM definition remain elusive. Moreover, the impact of GFM on system …

On the Evaluation of Frequency-Forming and Voltage-Forming Capabilities of Power Converters

Kehao Zhuang, Huanhai Xin, Hangyu Chen, Xiuqiang He et autres

Grid-forming (GFM) control has been recognized as a promising solution for building power electronics-dominated power systems due to its voltage/frequency support capabilities. Currently, the analysis of GFM control primarily focuses on specific control structures, such as droop control and virtual synchronous generator …

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An adaptive length-variation based evolutionary multitasking algorithm for feature selection of high-dimensional classification

Lingjie Li, Yuze Zhang, Zhijiao Xiao, Qiuzhen Lin et autres

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Comparison of Current-Limiting Strategies for Grid-Forming Converters Under Grid Faults

Xiuqiang He, Florian Dörfler, Gabriela Hug

This paper investigates the performance of three state-of-the-art current-limiting strategies for grid-forming (GFM) converters under grid faults. These highly effective strategies include virtual admittance control, virtual admittance control enhanced with virtual power feedback, and the recently developed cross-forming control. The performance comparison …

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