摘要
低压直流系统是实现分布式能源规模化接入、提高系统供电可靠性与供电能力的重要组网形态之一,其稳定性问题受到广泛关注。该文针对低压直流系统的振荡失稳现象,旨在分析不同控制方式下换流器(voltagesourceconverter,VSC)与直流网络振荡模态的交互影响以及系统稳定性。首先,阐述了低压直流系统的典型结构和控制策略,建立考虑交流侧电感动态的VSC直流电压控制环路模型,对比分析不同控制方式下的VSC与直流网络交互特性。然后,以低压三端直流系统为对象,提出灵活可拓展的模块化小信号建模方法,基于此模型对比研究了主从控制方式及下垂控制方式下的系统稳定性及其差异。进一步,建立相应的测试平台,对理论分析进行了实验验证。该文研究能够为低压直流系统的控制方式优选、VSC控制参数设计等提供有效的理论方法。
The low-voltage DC system is one of the important networking forms to realize the large-scale access of distributed energy resources and improve the reliability and power supply capacity of the system.Its stability issues have received widespread attention.Aiming at the oscillation instability phenomenon of low-voltage DC system,this paper analyzed the interaction between the voltage source converter(VSC)and the oscillation mode of DC network and system stability under different control methods.First,this article explained the typical structure and control strategy of the low-voltage DC system,and established the DC voltage control loop model of VSC which considered the dynamic characteristics of AC side inductance,and a comparative analysis of the interaction between the VSC and DC network under different control modes were made.Then,taking the low-voltage DC system as the object,a flexible and extensible modular small signal modeling method was proposed.Based on this model the stability of the system and its difference under the master-slave control mode and the droop control mode were analyzed.Furthermore,a corresponding test platform was established,and the theoretical analysis was experimentally verified.The research in this paper can provide effective theoretical methods for the optimal design of system control mode and VSC control parameters for the low-voltage DC system.
作者
邓卫
裴玮
吴琦
庄莹
孔力
DENG Wei;PEI Wei;WU Qi;ZHUANG Ying;KONG Li(Institute of Electrical Engineering Chinese Academy of Sciences,Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第S01期80-91,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(52177122)
中国科学院洁净能源先导科技专项项目(XDA21050000)
中国科学院前沿科学重点研究项目(QYZDB-SSW-JSC024)
关键词
低压直流系统
主从控制
下垂控制
稳定性
模块化
状态空间模型
low-voltage DC system
master-slave control
droop control
stability
modularization
state space model
