基于自适应阻抗适配器的新能源并网系统稳定性提升策略  

Stability Improvement Strategy for New Energy Grid-connected Systems Based on Adaptive Active Damper

作　　者：周柯 李旭阳 金庆忍 陈燕东[2] 谢志为 徐嘉诚 ZHOU Ke;LI Xuyang;JIN Qingren;CHEN Yandong;XIE Zhiwei;XU Jiacheng(Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,Guangxi Zhuang Autonomous Region,China;National Electric Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410082,Hunan Province,China)

机构地区：[1]广西电网有限责任公司电力科学研究院,广西壮族自治区南宁市530023 [2]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082

出　　处：《电网技术》2025年第4期1562-1572,I0063,共12页Power System Technology

基　　金：广西电网公司科技项目(GXKJXM20222063)。

摘　　要：电力电子发电装备输出阻抗在宽频带范围内存在负电阻特性,在接入弱电网时,发电装备与电网阻抗交互作用,易诱发新能源并网系统宽频带振荡现象。为解决该问题,提出在公共耦合点(point of common coupling,PCC)并联一个基于自适应虚拟阻抗控制的自适应阻抗适配器,在不同工况下自适应增强系统的阻尼,提高系统的稳定性,实现新能源并网系统的宽频带振荡抑制。所提方法无需复杂的虚拟阻抗设计,通过引入PCC点电压峰值变化量控制支路,即可得到自适应虚拟电阻,有效提高了阻抗适配器的灵活性与适应性。建立了考虑频率耦合的自适应阻抗适配器序导纳模型,对比分析了并入自适应阻抗适配器前后新能源并网系统的导纳特性,并入自适应阻抗适配器后,新能源并网系统的负阻性区域显著减少。基于所建的导纳模型,采用广义奈奎斯特稳定判据对系统稳定性进行了分析,分析结果表明自适应阻抗适配器有效提升了新能源并网系统在弱电网下的稳定性。最后,仿真验证了理论分析的准确性和所提基于自适应虚拟电阻控制的自适应阻抗适配器的有效性。The output impedance of power electronic power generation equipment has negative resistance characteristics within a wide frequency range.When connected to the weak grid,the interaction between the power generation equipment and the grid impedance can quickly induce broadband oscillation in the new energy grid-connected system.To address this issue,this article proposes to parallel an adaptive active damper based on adaptive virtual impedance control at the point of common coupling(PCC),which can adaptively enhance the system's damping under different operating conditions and achieve wideband oscillation suppression.The proposed method does not require a complex virtual impedance design.An adaptive virtual resistor can be obtained by introducing a PCC voltage peak change control branch,effectively improving the active damper's flexibility and adaptability.This article establishes an adaptive active damper sequence admittance model considering frequency coupling.It compares and analyzes the admittance characteristics of new energy grid-connected systems before and after incorporating the adaptive active damper.After incorporating the adaptive active damper,the negative resistance area of the new energy grid-connected system is significantly reduced.Based on the established admittance model,the system stability was analyzed using the Generalized Nyquist stability criterion.The analysis results showed that the adaptive active damper effectively improved the stability of the new energy grid-connected system under a weakgrid.Finally,the simulationverified the accuracy of the theoretical analysis and the effectiveness of the proposed adaptive active damper based on adaptive virtual resistance.

关 键 词：阻抗适配器 序导纳模型 频率耦合 稳定性分析 自适应 

分 类 号：TM721[电气工程—电力系统及自动化]