Research on primary frequency regulation and VSC-HVDC frequency synchronization control coordination method for large-scale hydropower DC export regional grid

Research on primary frequency regulation and VSC-HVDC frequency synchronization control coordination method for large-scale hydropower DC export regional grid

In asynchronous grid connection mode, the rotational inertia of the partitioned synchronized grid decreases, leading to prominent frequency stability issues. A bi-level optimization design method is proposed based on VSC-HVDC frequency synchronization control (VSC-FSC) and coordinated control of pri...

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Bibliographic Details
Main Authors: Hongchun Shu, Huaibin Gao, Zongxue Shao, Yongzan Cui, Wei Zhao
Format: Article
Language:English
Published: Elsevier 2025-07-01
Series:International Journal of Electrical Power & Energy Systems
Subjects:
VSC-FSC
Primary frequency control
Bi-level optimization
Water-hammer effect
Coordinated control
Online Access:http://www.sciencedirect.com/science/article/pii/S0142061525002066
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Summary:In asynchronous grid connection mode, the rotational inertia of the partitioned synchronized grid decreases, leading to prominent frequency stability issues. A bi-level optimization design method is proposed based on VSC-HVDC frequency synchronization control (VSC-FSC) and coordinated control of primary frequency regulation in hydropower. Additionally, to mitigate power counter-regulation caused by the water-hammer effect, an auxiliary control responsive to the water-hammer effect is introduced into the VSC-FSC. Firstly, the characteristics of VSC-FSC and primary frequency regulation of the power grid are analyzed. Then, based on the characteristics of VSC-FSC and its coordination with primary frequency regulation in hydropower, a bi-level optimization model for control parameters is constructed. An evolutionary algorithm is used to solve the optimal parameters hierarchically progressively. Finally, a simplified test system for the Luxi back-to-back HVDC and an improved 7-generator 36-node DC asynchronous extensive power grid system based on the IEEE standard model were developed in real-time digital simulation (RTDS) to validate the effectiveness of the proposed coordinated control method.
ISSN:0142-0615

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