摘要
为了研究模块化多电平换流器(MMC)采用功率同步控制时的阻抗特性和其接入后系统的宽频谐振稳定性,通过谐波状态空间方法,考虑MMC的内部动态特性和完整的控制回路,建立了MMC采用功率同步控制时的等效阻抗模型。分析了功率同步控制中新引入的功率同步环、无功-电压控制及其他主要控制环节对阻抗特性的影响。研究表明采用功率同步控制的MMC在次同步频段和高频段均可能出现负阻尼效应,因而存在引发谐振不稳定的风险。基于PSCAD/EMTDC进行了阻抗扫描和电磁暂态仿真,其仿真结果分别验证了所建立模型和稳定性分析结果的准确性。
To investigate the impedance characteristics of PSC-MMC(Power Synchronization Control based on Modular Multilevel Converter)and the broadband resonance stability of the system with grid-connected PSC-MMC,utilizing harmonic state space method,considering the internal dynamic characteristics and complete control loops of MMC,an equivalent impedance model of PSC-MMC is built.The effects of newly employed power synchronization loop,reactive-voltage control and other major control loops on impedance characteristics in the power synchronization control are analyzed.The study has identified that PSC-MMC might have negative damping effect in subsynchronous frequency band and high frequency band,so there is a risk of causing resonance instability.Impedance scanning and electromagnetic transient simulation are carried out based on PSCAD/EMTDC,the simulative results respectively verify the accuracy of the model and stability analysis results.
作者
陆秋瑜
杨银国
郑建平
李力
郭瀚临
张哲任
徐政
LU Qiuyu;YANG Yinguo;ZHENG Jianping;LI Li;GUO Hanlin;ZHANG Zheren;XU Zheng(Power Dispatching Control Center of Guangdong Power Grid Corporation,Guangzhou 510600,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第8期160-166,共7页
Electric Power Automation Equipment
基金
中国南方电网有限责任公司科技项目(036000KK52210042(GDKJXM20212057))。
关键词
功率同步控制
模块化多电平换流器
谐波状态空间
阻抗建模
谐振稳定性
power synchronization control
modular multilevel converter
harmonic state space
impedance modeling
resonance stability
