Stability Analysis and Transient Feedback Compensation with Virtual Impedance-Based Method for Parallel-Connected Synchronverters

被引：0
|
作者：
Ding, Lijian [1 ]
Zhang, Yao [1 ]
Zhang, Fan [1 ]
Kong, Yaguang [1 ]
机构：
[1] Hangzhou Dianzi Univ, Sch Automat, Hangzhou, Peoples R China
来源：
2022 IEEE 31ST INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE) | 2022年
基金：
美国国家科学基金会;
关键词：
virtual synchronous generator; small signal stability; virtual impedance; feedback compensation; SYNCHRONOUS GENERATOR;
D O I：
10.1109/ISIE51582.2022.9831525
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It is a promising solution to connect distributed generators (DGs) units to the grid via synchronverter. However, the differences between the parallel system composed of two synchronverters will affect the transient stability of the system, the fixed parameters cannot be applied to both steady state and dynamic state, which could threaten the stable operation of the system. Variable parameters using frequency or rate of change of frequency (ROCOF) are affected by grid voltage unbalance and harmonics. Thus, an adaptive variable virtual impedance control strategy is proposed in this paper. First, a small-signal stability analysis for parallel-connected synchronverters in a Micro-Grid is analyzed. The control method using feedback compensation of variable virtual impedance is proposed, which can reduce the power distribution difference between the parallel-connected VSG-based inverters in the transient state and keep the output voltage stable without any additional communication lines.
引用
收藏
页码：380 / 387
页数：8
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