一种新型三相电压型PWM整流器无差拍预测直接功率控制  

A Novel Dead-beat Predictive Direct Power Control of Three-phase PWM Rectifier

作　　者：李晖 梅成林 林明耀[2] 艾建 LI Hui;MEI Chenglin;LIN Mingyao;AI Jian(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,Guangdong Province,China;School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广东省广州市510000 [2]东南大学电气工程学院,江苏省南京市210096

出　　处：《电网技术》2021年第2期689-695,共7页Power System Technology

摘　　要：传统三相电压型PWM整流器无差拍预测直接功率控制在理想电网下具有网侧电流谐波含量低、瞬时功率脉动小和开关频率固定等优点。但三相电网不平衡时,如果仍然采用传统控制策略,将导致网侧电流谐波含量高、瞬时功率脉动大。为此,采用新型瞬时功率定义,提出一种新型无差拍预测控制策略。新型控制策略以消除瞬时有功功率中二倍频分量为控制目标,结合PWM整流器的功率控制模型,获取下一周期电压矢量参考值,并利用空间矢量脉宽调制来生成该矢量。此外,引入了准积分反馈校正环节,在每个周期对新型瞬时功率的预测给定值进行修正。仿真和实验结果表明,新型控制策略能有效抑制电流谐波分量以及瞬时功率脉动,实现电网平衡和不平衡下的正常工作。Conventional dead-beat predictive direct power control(DB-P-DPC) for three-phase PWM rectifier has numerous advantages such as low current harmonics, small power ripples and fixed switching frequency under ideal grid voltages conditions. However, in unbalanced network conditions, the conventional DB-P-DPC cannot work normally, which leads to high current harmonics and large power ripples. To this end, this paper adopts a new instantaneous power definition and presents a novel DB-P-DPC strategy. The aim of the novel DB-P-DPC is to eliminate twice frequency oscillations in instantaneous active power. Based on the power control model of PWM rectifier, the proposed control strategy can obtain the voltage vector reference in the next control period, which is synthesized by using space vector modulation(SVM). A feedback compensation link is introduced to modify predictive reference value of the novel instantaneous power in each control period. Both simulation and experiment results show that the proposed strategy can effectively reduce current harmonics and instantaneous power ripples without steady-state power errors. What’s more, it can work normally under both balanced and unbalanced network conditions.

关 键 词：三相电压型PWM整流器 新型瞬时功率定义 反馈补偿 电网不平衡 

分 类 号：TM721[电气工程—电力系统及自动化]