基于储能PCS并联的微网谐振抑制及稳定控制  

Resonance Suppression and Stability Control of Microgrid Based on Parallel Storage PCS

作　　者：王哲[1] 何平[1] 孙阔 张章[1] WANG Zhe;HE Ping;SUN Kuo;ZHANG Zhang(State Grid Tianjin Electric Power Company,Tianjin 300010,China)

机构地区：[1]国网天津市电力公司,天津300010

出　　处：《电力电子技术》2024年第8期78-82,共5页Power Electronics

摘　　要：微网系统中的储能电力电子接口变换器通常呈并联结构,且通过LCL滤波器连接到公共母线。LCL滤波器自身具有谐振问题,特别是在储能PCS并联系统中,频域分析结果中存在额外的正向谐振尖峰和反向谐振尖峰。此处在分析微网中带有LCL滤波器的储能并联逆变器系统谐振特性的基础上,采用基于双二阶滤波器的主动阻尼方法,在不引入额外的传感器和控制闭环的情况下,对并联系统中多对不稳定极点同时进行调整。该方法通过在控制系统中添加两对零极点,改变根轨迹的走向,使得多对不稳定极点均移动到z平面单位圆之内,因此系统稳定性得以保证。基于dSPACE1103搭建的实时硬件在环实验平台验证了理论分析结果。The storage power electronics interfacing converters are usually parallel connected to the common bus via LCL filters in a microgrid system.The LCL filters have resonance problems,especially in a parallel storage PCS,the additional resonance and anti-resonance peaks can be found in the frequency domain analysis result.On the basis of analyzing the resonance characteristics of storage parallel inverter systems with LCL filters in microgrids,active damping method based on bi-quad filter is adopted,simultaneously adjusting multiple pairs of unstable poles in a par-allel system without introducing additional sensors and control loops.This method adds two pairs of zero poles to the control system,changes the direction of the root trajectory,and causes multiple pairs of unstable poles to move within the unit circle of the z-plane,thus ensuring system stability.The theoretical analysis result is validated by real time hardware in the loop experimental platform implemented by dSPACE1103.

关 键 词：变换器 微网 谐振抑制 稳定控制 

分 类 号：TM46[电气工程—电器]