摘要
为提高微网的供电可靠性,改善电能质量,文中针对基于虚拟同步发电机(Virtual Synchronous Generator,VSG)的电压源型微网逆变器,将准同期并列算法和孤岛检测算法相结合,提出一种可同时满足并网和孤岛运行及模式间切换为实现柔性并网,通过模拟同步发电机的准同期并列装置,设计了微网逆变器的准同期并列算法以抑制并网瞬间的电流冲击。为能快速检测到非计划孤岛现象,使微网顺利转入主动孤岛运行,结合VSG算法自身特点,设计了一种适用于VSG的孤岛检测算法。为实现微网的稳定运行,给出了并网/孤岛运行模式的平滑切换控制实现方法。最后,通过基于MATLAB/simulink的仿真结果验证了综合控制策略的正确性与有效性。
In allusion to the micro-grid inverter based on voltage synchronous generator model （VSG） in micro-grid, an integrated control method combining quasi-synchronous parallel algorithm and island detection algorithm is proposed to improve the reliability and quality of power supply. The integrated control strategy can simultaneously satisfy the requirements of grid-connected operation and island operation as well as smoothly switching between two operation modes. For realizing the flexible grid- connection, the quasi-synchronous parallel algorithm of micro-grid inverter is designed to simulate the quasi synchronizing device of synchronous generator, which can restrain instantaneous current shock occurs. For quickly detecting the phenomenon of unplanned islanding, an island detection algorithm combining with the characteristics of VSG algorithm for is put forward for smoothly switching to the active islanding operation. For realizing the stable operation of micro-grid, a smooth switching control method of grid-connected/ island operation mode is provided. Finally, the correctness and effectiveness of the proposed models and control strategies are verified by the simulation results based on MATLAB/simulink.
作者
施凯
焦龙
徐培凤
叶海涵
SHI Kai;JIAO Long;XU Pei-feng;YE Hai-han(School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu Province,China)
出处
《信息技术》
2018年第10期52-57,61,共7页
Information Technology
基金
国家自然科学基金资助项目(51407085)
中国博士后科学基金面上项目(2015M571685)
江苏省高校优势学科建设工程资助项目
关键词
微网逆变器
虚拟同步发电机
准同期并列
孤岛检测
平滑切换控制
micro-grid inverter
virtual synchronous generator （VSC,）
quasi-synchronization
islandeddetection
smooth-switch control
