提升新能源多机并网稳定性的自适应有源阻尼器  

An Active Damper and Its Adaptive Control for Improving the Stability of New Energy Multi-Inverter Grid-Connection

作　　者：何志方 贺卫华 冯维明 张鹏 HE Zhifang;HE Weihua;FENG Weiming;ZHANG Peng(State Grid Shanxi Electric Power Company Limited,Taiyuan 030021,Shanxi,China;Electronics and Electrical Engineering School,Shanghai Jiaotong University,Shanghai 200240,China;Yuncheng Branch of State Grid Shanxi Electric Power Company Limited,Yuncheng 044000,Shanxi,China)

机构地区：[1]国网山西省电力公司,山西太原030021 [2]上海交通大学电子信息与电气工程学院,上海200240 [3]国网山西省电力公司运城供电公司,山西运城044000

出　　处：《电网与清洁能源》2025年第3期103-111,共9页Power System and Clean Energy

基　　金：国家电网有限公司科技项目(5205M0220001)。

摘　　要：并网逆变器作为新能源发电系统与电网的电力电子接口装置,易与电网产生交互作用引发系统谐振,严重时将导致新能源并网振荡失稳。提出了一种频率/阻尼自适应有源阻尼器,将其布署在新能源接入公共连接点(point of common coupling,PCC)处以实现对新能源并网系统未知频率的谐振抑制。分析了并网逆变器系统多频谐振产生机理,给出了基于多谐波检测的有源阻尼器工作原理,提出级联型多重二阶广义积分-锁频环(second order generalized integrator-frequency loop lock,SOGI-FLL)结构以实现对各频率谐波的自动提取。在此基础上进一步提出了自适应电阻控制策略,可分别为不同谐波提供合适的虚拟电阻值,以减少有源阻尼器带来的功率损耗,并详细分析了有源阻尼器接入后对新能源并网系统稳定性的影响。通过实时仿真系统(real time digital simulation system,RTDS)硬件在环实验平台进行实验验证,实验结果表明,有源阻尼器的投入,可有效抑制新能源并网系统多频谐振,提高并网系统的稳定性。The grid-connected inverter,as the power electronic interface device between new energy power generation systems and the power grid,is prone to interaction with the grid,which can lead to system resonance.In severe cases,this can cause oscillation and instability in the grid connection of new energy sources.This paper proposes a frequency/damping self-adaptive active damper,which is installed at the point of common coupling(PCC)of new energy access to suppress resonance at unknown frequencies in the grid-connected new energy system.The mechanism of multi-frequency resonance generation in grid-connected inverter systems is analyzed,and the working principle of the active damper based on multiharmonic detection is presented.A cascaded multi-secondorder generalized integrator-frequency locked loop(SOGIFLL)structure is proposed to automatically extract harmonics at various frequencies.On this basis,an adaptive resistance control strategy is further proposed,which can provide appropriate virtual resistance values for different harmonics to reduce the power loss caused by the active damper.The stability impact of the active damper on the grid-connected new energy system is also analyzed in detail.Experiments were conducted on a real-time digital simulation system(RTDS)hardware-in-theloop experimental platform,and the results show that the active damper can effectively suppress multi-frequency resonance in the grid-connected new energy system and improve the stability of the grid connection.

关 键 词：有源阻尼 谐波检测 虚拟电阻控制 新能源并网 谐振抑制 稳定性分析 

分 类 号：TM76[电气工程—电力系统及自动化]