基于多逆变器相位协同控制的直流微电网母线电压二次纹波抑制方法  

Second-order Voltage Ripple Suppression Method for DC Microgrid Bus Based on Phase-coordinated Control of Multiple Inverters

作　　者：齐永韬 余墨多 黄文焘[2] 邰能灵[1] 祝彦兵[3] 王良秀[3] 杨永 QI Yongtao;YU Moduo;HUANG Wentao;TAI Nengling;ZHU Yanbing;WANG Liangxiu;YANG Yong(College of Smart Energy(Shanghai Jiao Tong University),Minhang District,Shanghai 200240,China;Key Laboratory of Control of Power Transmission and Conversion(Shanghai Jiao Tong University),Ministry of Education,Minhang District,Shanghai 200240,China;704 Research Institute of China Shipbuilding Industry Corporation,Xuhui District,Shanghai 200031,China)

机构地区：[1]智慧能源创新学院(上海交通大学),上海市闵行区200240 [2]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市闵行区200240 [3]中国船舶重工集团公司第704研究所,上海市徐汇区200031

出　　处：《电网技术》2025年第2期738-747,I0101,共11页Power System Technology

基　　金：国家自然科学基金青年基金项目(52207124)。

摘　　要：在直流微电网中,经逆变器接入直流母线的三相不平衡负载会产生二次纹波功率,使逆变器输入电流中含有二次纹波,导致直流母线电压出现二次纹波分量,影响微电网供电电能质量和可靠性。针对该问题,该文提出多逆变器相位协同控制的直流母线纹波电压抑制方法,解决了传统纹波抑制方案对系统原始工作状态产生影响的问题,并增强了二次纹波的抑制效果。分析了二次纹波的产生机理与叠加特性,归纳了总纹波电流幅值与各支路纹波电流相位差的关系,提出通过控制相位差实现降低总纹波电流幅值的方案。为实现该方案并降低相位调节暂态过程中负载电压的波动,该文建立了参考相位优化模型,计算各支路纹波电流的最优参考相位。提出逆变器输入侧纹波电流相位控制策略,使纹波电流相位能跟踪参考相位,并采用分段式相位调节以防止相位变动过快。该文所提方案无需增设滤波设备,对系统原有工作状态影响小,可应对含多个分布式不平衡负载的场景,在一定条件下可将母线二次纹波电压降低95%。仿真证明了所提控制策略的有效性。In DC microgrids,three-phase unbalanced loads connected to the bus through inverters generate power fluctuations at double frequency,resulting in second-order ripple on the DC bus,affecting the power quality and reliability of the microgrid.To address this issue,this paper proposes a method for suppressing DC bus voltage ripple through coordinated control of multiple inverters.This method solves the problem of traditional ripple suppression methods affecting the system's original operating state and enhances the effect of the suppression.The mechanism and superposition characteristics of the second-order ripple are analyzed.A solution is proposed to reduce the total ripple current amplitude by controlling the phase difference.To implement this solution and reduce the fluctuation of load voltage during transient,a reference phase optimization model is established to calculate the optimal reference phase.An inverter phase control strategy is proposed to enable the ripple current phase to track the reference phase,and a segmented phase regulation is adopted to prevent voltage fluctuations.The proposed method does not require additional devices,has minimal impact on the system's original operating state,and can handle scenarios with multiple unbalanced loads.Under certain conditions,the second-order ripple in the bus can be reduced by 95%.Simulation results demonstrate the effectiveness of the proposed control strategy.

关 键 词：直流微电网 电能质量 二次纹波 协同控制 相位调节 

分 类 号：TM721[电气工程—电力系统及自动化]