电力系统自动化2025，Vol.49Issue(9)：199-207,9.DOI:10.7500/AEPS20240622003
基于PRBS的中压直流系统宽频阻抗测量装置及其控制
Wide-band Impedance Measurement Device for Medium-voltage DC Systems and Its Control Based on Pseudo-random Binary Sequence
摘要
Abstract
With the deepening of power electronization in the DC system,the port impedance characteristics of power electronic devices have a certain impact on the system stability.To obtain the impedance characteristics of the medium-voltage DC system for the system stability evaluation,this paper studies the wide-band impedance measurement device.First,the pseudo-random binary sequence(PRBS)is used as the output perturbation measurement signal,and an impedance measurement device with cascaded multi-level topology of hybrid sub-modules is proposed.On this basis,a centralized modulation method based on the sub-module classification is proposed,which realizes the high-quality output of PRBS signals through the division and cooperation of four working modes of the sub-modules.The capacitor voltage equalization of the sub-modules can be achieved,which is conducive to reducing the switching loss.The calculation principle of the relevant main circuit parameters is designed.Finally,the hardware-in-the-loop simulation result verifies the effectiveness of the proposed control method,which shows that the proposed impedance measurement device has a good output effect and can improve the measurement efficiency under the premise of meeting the requirements of impedance measurement.关键词
中压直流系统/阻抗测量/伪随机二进制序列(PRBS)/级联多电平拓扑/集中式调制/混合子模块/电容均压Key words
medium voltage DC system/impedance measurement/pseudo-random binary sequence(PRBS)/cascaded multi-level topology/centralized modulation/hybrid sub-module/capacitor voltage balancing引用本文复制引用
季振东,朱述超,许光强,王建华,赵剑锋,肖小龙..基于PRBS的中压直流系统宽频阻抗测量装置及其控制[J].电力系统自动化,2025,49(9):199-207,9.基金项目
国家自然科学基金资助项目(51707098). This work is supported by National Natural Science Foundation of China(No.51707098). （51707098）
