VSG控制的无人船低电压故障短路电流计算方法
Calculation Method of Low Voltage Fault Short Circuit Current for Unmanned Ship Based on VSG Control
张平 1杨恒瑞 2丁峰 2邹雁龙2
作者信息
- 1. 海军装备部驻上海地区第八军事代表室,上海 200011
- 2. 上海船舶设备研究所,上海 200031
- 折叠
摘要
为保证某混合能源无人船中储能设备并入交流母线的稳定性和安全性,采用虚拟同步发电机(VSG)技术对储能设备进行控制.通过对无人船电力系统发生对称低电压故障后的虚拟同步发电机进行暂态分析,考虑到虚拟同步发电机与传统同步发电机在功角特性、耐流能力等方面的不同,对虚拟同步发电机提出新的暂态分析方法,并改进传统短路电流的计算方法,提出考虑内电势变化的改进短路电流迭代计算方法,以提高短路电流计算的精确性.相比于不考虑内电势变化,该计算方法计算得到的短路电流实现了理论值与仿真值的吻合,误差率小于0.5％,可为后续无人船保护整定提供精确的参考依据.
Abstract
To ensure the stability and safety of energy storage devices integrated into the AC bus of a hybrid energy unmanned ship,virtual synchronous generator(VSG)technology is employed to control the energy storage devices.By performing transient analysis on the VSG after a symmetrical low-voltage fault occurs in the unmanned ship's power system,taking into account the differences between VSG and conventional synchronous generators in terms of power angle characteristics and current withstand capability,a new transient analysis method is proposed for VSG Additionally,the traditional short-circuit current calculation method is improved by introducing an iterative calculation method considering internal voltage variation,aiming to enhance the accuracy of short-circuit current calculation.Compared with the internal potential change,the short-circuit current calculated by this method is consistent with the theoretical value and the simulation value,and the error rate is less than 0.5％,which can provide an accurate reference for the subsequent protection setting of unmanned ships.
关键词
混合能源无人船/虚拟同步发电机/低电压故障/短路电流/计算方法Key words
hybrid energy unmanned ship/virtual synchronous generator(VSG)/low voltage fault/short circuit current/calculation method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据