Research on Power Transmission Capacity of Transmission Section for Grid-Forming Renewable Energy via AC/DC Parallel Transmission System Considering Synchronization and Frequency Stability Constraints

Zhengnan Gao, Zengze Tu (), Shaoyun Ding, Liqiang Wang, Haiyan Wu, Xiaoxiang Wei, Jiapeng Li and Yujun Li
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Zhengnan Gao: Inner Mongolia Power (Group) Co., Ltd., Inner Mongolia Electric Power Research Institute Branch, Hohhot 010020, China
Zengze Tu: Electrical Engineering College, Xi’an Jiaotong University, Xi’an 710049, China
Shaoyun Ding: Electrical Engineering College, Xi’an Jiaotong University, Xi’an 710049, China
Liqiang Wang: Inner Mongolia Power (Group) Co., Ltd., Inner Mongolia Electric Power Research Institute Branch, Hohhot 010020, China
Haiyan Wu: Inner Mongolia Power (Group) Co., Ltd., Inner Mongolia Electric Power Research Institute Branch, Hohhot 010020, China
Xiaoxiang Wei: Electrical Engineering College, Xi’an Jiaotong University, Xi’an 710049, China
Jiapeng Li: Electrical Engineering College, Xi’an Jiaotong University, Xi’an 710049, China
Yujun Li: Electrical Engineering College, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2025, vol. 18, issue 15, 1-14

Abstract: AC/DC parallel transmission is a critical approach for large-scale centralized transmission. Existing assessments of power transfer capability in AC/DC corridors rarely incorporate comprehensive security and stability constraints, potentially leading to overestimated results. This paper investigates a grid-forming renewable energy system integrated via AC/DC parallel transmission. First, the transmission section’s power transfer limit under N-1 static security constraints is determined. Subsequently, analytical conditions satisfying synchronization and frequency stability constraints are derived using the equal area criterion and frequency security indices, revealing the impacts of AC/DC power allocation and system parameters on transfer capability. Finally, by integrating static security, synchronization stability, and frequency stability constraints, an operational region for secure AC/DC power dispatch is established. Based on this region, an optimal power allocation scheme maximizing the corridor’s transfer capability is proposed. The theoretical framework and methodology enhance system transfer capacity while ensuring AC/DC parallel transmission security, with case studies validating the theory’s correctness and method’s effectiveness.

Keywords: AC/DC parallel system; power transmission capacity; synchronous stability; frequency stability; grid-forming (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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