中国电机工程学报2026，Vol.46Issue(16)：6018-6027,中插26,11.DOI:10.13334/j.0258-8013.pcsee.250981
提升高压直挂储能变流器暂态过载能力的调控方法
Control Techniques for Enhancing Transient Overload Capability of High-voltage Transformerless Battery Energy Storage System
摘要
Abstract
Grid-forming high-voltage transformerless energy storage is a critical equipment for supporting the steady-state power balance and transient active support of new power systems. To achieve transient support,a certain overcurrent capability is required. However,the current practice of over-sizing devices leads to increased system costs. This paper leverages the modular topology and control flexibility of high-voltage transformerless energy storage systems to propose a dynamic topology reconfiguration method for enhancing overload capability. Furthermore,an electro-thermal coupling model for the devices is established,and an online junction temperature estimation method is introduced. By implementing closed-loop control of the junction temperature,the thermal stress margin of the power devices is fully exploited,leading to the development of methods for maximizing and regulating the overcurrent capability of grid-forming equipment. Based on the above research,the transient overcurrent capability of the equipment is economically enhanced without oversizing the power devices. Finally,the effectiveness of the proposed design method and control strategy is verified through electromagnetic–thermal co-simulation. During faults,the equipment can deliver up to 3.65 times the rated transient current,significantly improving the voltage support capability of the grid-forming converter at the point of common coupling.关键词
高压直挂/电池储能/构网型/电网暂态支撑/短时过载Key words
high-voltage transformerless/battery energy/grid forming/grid transient support/short-term overload分类
信息技术与安全科学引用本文复制引用
吴西奇,刘怡琳,马柯,卢宇,李睿,蔡旭..提升高压直挂储能变流器暂态过载能力的调控方法[J].中国电机工程学报,2026,46(16):6018-6027,中插26,11.基金项目
中国博士后科学基金资助项目(2025M780475) （2025M780475）
国家资助博士后研究人员计划(GZC20250337). China Postdoctoral Science Foundation(2025M780475) （GZC20250337）
National-funded Postdoctoral Research Program(GZC20250337). （GZC20250337）
