摘要
由于非不平衡控制策略中没有考虑线电压和相电流的相角差,造成三相电网的有功、无功电流无法完全补偿。为了解决这一问题,根据电压电流相角差,推导出单相补偿器中无功参考补偿电流与负载电流的关系,提出一种两桥臂交叉解耦不平衡控制策略,利用多变量滤波器和交叉解耦双复系数滤波器优化锁相环,精确锁定三相不平衡电网的电压频率和相位,对2个单相背靠背变换器的无功电流分别控制,进而利用两桥臂变换器补偿三相不平衡无功。实验结果验证了所提两桥臂交叉解耦不平衡控制策略,可抑制三相有功不平衡及补偿三相不平衡无功,将三相电流的不平衡度从150.0%降低至2.6%,三相电网功率因数从0.257提升至0.997,减少了三相无功补偿器的开关管个数。
To solve the problem that the phase angle difference between line voltage and phase current is not considered in non-unbalanced control strategy,the active and reactive current of three-phase cannot be completely compensated,the relationship between the compensation reference current and the load current was deduced based on the phase angle difference.Then,a cross decoupling unbalance control strategy was proposed for two-leg converter,which used multiple variable filter(MVF)and crossing decoupling double complex coefficient filter(DCCF)to optimize the phase-locked loop(PLL),and voltage frequency and phase under three-unbalanced grid voltages were precisely locked.According to the relationship,two single-phase converter was used to compensate three-phase grid unbalanced active and reactive current.The experimental results prove that the proposed control strategy can effectively suppress three-phase unbalanced active current and compensate for three-phase unbalanced reactive current,three-phase current unbalance factor can be reduced from 150.0%to 2.6%,and three-phase grid power factor can be increased from 0.257 to 0.997 under the experimental load conditions.Moreover,the number of switches of three-phase reactive power compensator can be significantly reduced.
作者
谢锡锋
孔繁镍
舒泽亮
左江林
张帅
XIE Xifeng;KONG Fannie;SHU Zeliang;ZUO Jianglin;ZHANG Shuai(School of Electric Power,Guangxi Vocational College of Water Resources and Electric Power,Nanning 530023,China;School of Electrical Engineering,Guangxi University,Nanning 530004,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2024年第1期112-122,共11页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(52077183)
广西自然科学基金项目(2021GXNSFAA220136)
广西高等学校高水平创新团队及卓越学者计划资助(桂教人才〔2020〕6号)
教育部高等学校科学研究发展中心“虚拟仿真技术在职业教育教学中的创新应用”专项课题(ZJXF2022099)。
关键词
单相半桥背靠背变换器
两桥臂变换器
交叉解耦控制
三相无功补偿
two single-phase half-bridge converter
two-leg converter
cross decoupling control
three-phase reactive current compensation
