@Article{ee.2025.066738,
AUTHOR = {Weibing Xu, Bo Yao, Xiangjun Quan, Xunyou Zhang, Ning Zou, Shuo Liu, Jia Wang, Jiansuo Zhang},
TITLE = {Calculation of Commutation Failure Overvoltage in High-Voltage Direct Current Transmission Terminal Systems with Grid-Forming Renewable Energy Sources},
JOURNAL = {Energy Engineering},
VOLUME = {122},
YEAR = {2025},
NUMBER = {10},
PAGES = {4225--4243},
URL = {http://www.techscience.com/energy/v122n10/63995},
ISSN = {1546-0118},
ABSTRACT = {The integration of large-scale new energy and high-capacity DC transmission leads to a reduction in system inertia. Grid-forming renewable energy sources (GF-RES) has a significant improvement effect on system inertia. Commutation failure faults may cause a short-term reactive power surplus at the sending end and trigger transient overvoltage, threatening the safe and stable operation of the power grid. However, there is a lack of research on the calculation method of transient overvoltage caused by commutation failure in high-voltage DC transmission systems with grid-forming renewable energy sources integration. Based on the existing equivalent model of high-voltage DC transmission systems at the sending end, this paper proposes to construct a model of the high-voltage DC transmission system at the sending end with grid-forming renewable energy sources. The paper first clarifies the mechanism of overvoltage generation, then considers the reactive power droop control characteristics of GF-RES, and derives the transient voltage calculation model of the DC transmission system with GF-RES integration. It also proposes a calculation method for transient overvoltage at the sending-end converter bus with GF-RES integration. Based on the PSCAD/EMTDC simulation platform, this paper builds an experimental simulation model. By constructing three different experimental scenarios, the accuracy and effectiveness of the proposed transient overvoltage calculation method are verified, with a calculation error within 5%. At the same time, this paper quantitatively analyzes the impact of grid strength, new energy proportion, and rated transmission power on transient overvoltage from three different perspectives.},
DOI = {10.32604/ee.2025.066738}
}