不平衡电压条件下并网逆变器多目标协同控制  

Multi-objective Cooperative Control of Grid Connected Inverter Under Unbalanced Voltage

作　　者：崔金豹 CUI Jin-bao(Ordors City Power Design Co.,Ltd.,Ordors 017000,China)

机构地区：[1]鄂尔多斯市和效电力设计有限责任公司,内蒙古鄂尔多斯017000

出　　处：《电力电子技术》2021年第5期105-109,共5页Power Electronics

基　　金：国家自然科学基金(51277069)。

摘　　要：为提高电压不平衡条件下并网逆变器的运行性能,提出一种功率振荡与当前谐波抑制的多目标协同控制策略。首先建立了基于无波动条件下平衡电流、有功功率、无功功率的数学模型,并将峰值限制在安全范围内。然后,针对传统离散傅里叶算法运算复杂度高的缺点,提出一种适用于电压正负不平衡序列的简化滑动递归离散傅里叶变换(SRDFT)算法,准确、快速地分离正、负序向量分量。实验结果表明,在电压不平衡的情况下,并网逆变器的输出电能质量可以得到显著改善,在抑制电流畸变、减小功率波动的同时,保证了系统的安全快速响应,实现了多目标协同控制。In order to improve the operation performance of grid connected inverter under unbalanced voltage,a multiobjective cooperative control strategy of power oscillation and current harmonic suppression is proposed.Firstly,the mathematical model of balancing current,active power and reactive power under the condition of no fluctuation is established,and the peak value is limited in the safe range.Then,aiming at the disadvantage of high computational complexity of traditional discrete Fourier transform algorithm,a simplified sliding recursive discrete Fourier transform(SRDFT)algorithm is proposed to separate the positive and negative sequence vector components accurately and quickly.The experimental results show that the output power quality of the grid connected inverter can be significantly improved in the case of unbalanced voltage,which can suppress the current distortion and reduce the power fluctuation,ensure the safe and rapid response of the system,and realize the multi-objective cooperative control.

关 键 词：并网逆变器 协同控制 傅里叶变换 不平衡电压 

分 类 号：TM464[电气工程—电器]