功率变化环境下的四线制Vienna整流器优化联合控制方法  

An Improved Control Method of 4-Wire Vienna Rectifier Considering Power Fluctuation

作　　者：杨頔 姚钢[1] 周荔丹[1] Yang Di;Yao Gang;Zhou Lidan(Key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Department of Electrical Engineering Shanghai Jiao Tong University,Shanghai 200240 China)

机构地区：[1]上海交通大学电气工程系电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《电工技术学报》2021年第2期305-319,共15页Transactions of China Electrotechnical Society

基　　金：上海市自然科学基金资助项目(18ZR1418400)。

摘　　要：在传统双闭环比例积分(PI)控制器调节下,功率的变化会造成三相四线制Vienna整流器中交流电流的过零点畸变问题。为克服这一现象,该文首先从电流工作模式,即连续与断续模式角度讨论功率变化对电流波形的影响,基于此提出PI-前馈干预-重复控制的联合控制策略,该联合控制策略中,一方面可通过占空比前馈干预使电流在过零点处不存在畸变问题;另一方面利用重复控制,进一步抑制电流谐波,提高电流跟踪精度。然后对该四线制Vienna整流控制系统进行控制器参数设计和稳定性验证。最后通过仿真和实验结果表明,上述功率变化以及占空比前馈干预对电流波形的影响,并验证了该联合控制方法在功率变化环境下工作的可行性。In most cases,power fluctuation will result in zero-crossing distortion and current ripples during the operation of three-phase four-wire Vienna rectifier under the traditional dual loop control with PI regulator.This paper discussed the influence of power fluctuation on the input current from the perspective of continuous current mode(CCM)and discontinuous current mode(DCM).Accordingly,a combination of PI controller,repetitive controller and duty-ratio feedforward control,as an improved control strategy,was proposed.On one hand,the intervention method of duty-ratio feedforward compensation can effectively eliminate the zero-crossing distortion in AC current.On the other hand,the repetitive controller gives a fiercer attenuation of AC current harmonics and has a better ability to deal with the grid voltage interruption.System modeling,parameter design and stability verification were also carried out.Finally,simulation and experiment verified the proposed control strategy.

关 键 词：VIENNA 整流器 占空比前馈 重复控制 PI 控制器 连续电流模式 

分 类 号：TM461[电气工程—电器]