基于复合控制的电力电子变压器控制策略研究
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摘要
在电力电子变压器(PET)中,针对高频变压器连接的输入级与输出级的变换器,现有的控制策略太过复杂,文中提出了一种复合控制应用在整个系统中。复合控制器由前馈解耦控制和智能预测控制两部分组成,前馈控制将系统中的交叉耦合电势进行完全解耦,然后智能预测控制通过离散模型来预测电路变量,确保交流输出的电流参考值最接近前馈项的估计值。并且在下一个采样周期,选择最合适的开关状态来驱动功率器件。对系统输入和输出之间的不同电压幅值以及负载功率的变化进行仿真实验,仿真结果表明能够改善系统的稳态性能以及抗干扰能力,并得到单位功率因数运行,研究表明了所提出方法的正确性和有效性。
In power electronic transformers (PET),for the converters of the input and output stages of the high-frequency transformer connection,the existing control strategy is too complicated,and therefore,a composite control is proposed in this paper and applied in the whole system. The compound controller consists of two parts including feed-forward decoupling control and intelligent predictive control. The feed-forward control is fully decoupled based on the cross-coupling potential in the system,and then,the discrete model passed by the intelligent predictive control predicts the circuit variables,ensuring that the current reference of the AC output is closest to the estimate of the feed-forward term. And in the next sampling cycle,the most suitable switching state is chose to drive the power device. The simulation experiment is carried out on the different voltage amplitudes and load power changes between the input and output of the system. The simulation results show that the system can improve the steady-state performance and anti-interference ability,and obtain the unit power factor operation. The research shows that the correctness and effectiveness of the proposed method.
In power electronic transformers (PET),for the converters of the input and output stages of the high-frequency transformer connection,the existing control strategy is too complicated,and therefore,a composite control is proposed in this paper and applied in the whole system. The compound controller consists of two parts including feed-forward decoupling control and intelligent predictive control. The feed-forward control is fully decoupled based on the cross-coupling potential in the system,and then,the discrete model passed by the intelligent predictive control predicts the circuit variables,ensuring that the current reference of the AC output is closest to the estimate of the feed-forward term. And in the next sampling cycle,the most suitable switching state is chose to drive the power device. The simulation experiment is carried out on the different voltage amplitudes and load power changes between the input and output of the system. The simulation results show that the system can improve the steady-state performance and anti-interference ability,and obtain the unit power factor operation. The research shows that the correctness and effectiveness of the proposed method.
引文
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[15]K.Basu,A.Shahani,A.K.Sahoo and N.Mohan.A single-stage solid-state transformer for PWM AC drive with source-based commutation of leakage energy.in IEEE Transactions on Power Electronics,vol.30,no.3,pp.1734-1746,March 2015.
[2]W.Kolar Johann,G.Oritiz.Solid-state-transformers:key components of future traction and smart grid systems.in Proc.the International Power Electronics Conference-ECCE Asia(IPEC),pp.1-14,2014.
[3]刘洋.电力电子变压器在智能电网中的应用研究[D].济南:山东大学,2014.Liu Yang.Solid-state transformer in the smart grid application research[D].Shandong University,2014.
[4]邱鹏,孙冬梅,嵇保健,等.面向智能配电网的电力电子变压器研究[J].电测与仪表,2016,53(1):112-116.Qiu Peng,Sun Dongmei,Ji Baojian,et al.Research on smart distribution grid oriented power electronic transformer[J].Electrical Measurement&Instrumentation,2016,53(1):112-116.
[5]贺威.电力电子变压器DC-DC变换器的设计[D].徐州:中国矿业大学,2016.He Wei.Design of DC-DC Converter in Power Electronic Transformer[D].China University of Mining and Technology,2016.
[6]薛伟,郑丽君,高云广,等.电力电子变压器中高频变压器的设计方法[J].电测与仪表,2015,52(23):117-121,128.Xue Wei,Zheng Lijun,Gao Yunguang,et al.Design of high frequency transformer applied in the power electronic transformer[J].Electrical Measurement&Instrumentation,2015,52(23):117-121,128.
[7]M.P.P.Mary and V.Sivachidambaranathan.Implementation of a new Bi-directional three phase parallel resonant high frequency AC link converter.2016 International Conference on Computation of Power,Energy Information and Commuincation(ICCPEIC),Chennai,2016,pp.613-619.
[8]Yang Mei,Kai Sun Daning Zhou,Lipei Huang,et al.Application of Matrix Converter in Auxiliary Drive System for Diesel Locomotives[A].Industry Application Conference[C].2005,4:2476-2483.
[9]陈武,王付胜,张兴,等.基于新型调制策略的三相-单相矩阵变换器研究[J].电力电子技术,2010,(10):29-31.Chen Wu,Wang Fusheng,Zhang Xing,et al.Research on three-phase single-phase matrix converter based on new modulation strategy[J].Power Electronics,2010,(10):29-31.
[10]吴云亚,阚加荣,谢少军.逆变器无线并联系统的建模与仿真[J].系统仿真学报,2009,21(12):3807-3812.Wu Yunya,Kan Jiarong,Xie Shaojun.Modeling and Simulation of Parallel Inverter System without Control Interconnection[J].Journal of System Simulation,2009,21(12):3807-3812.
[11]高志刚,冬雷,李永东,等.基于高频变压器的级联H桥型变换器[J].电工技术学报,2013,(6):133-138.Gao Zhigang,Dong Lei,Li Yongdong,et al.H-bridge converter based on high-frequency transformer[J].Transactions of China Electro technical Society,2013,(6):133-138.
[12]陈虹.智能预测控制[M].北京:科学出版社,2013.
[13]J.i.Itoh,T.Iida and A.Odaka.Realization of high efficiency AC link converter system based on AC/AC direct conversion techniques with RB-IGBT.IECON 2006-32nd Annual Conference on IEEE Industrial Electronics,Paris,2006,pp.1703-1708.
[14]朱晓雨,王丹,彭周华,等.三相电压型逆变器的延时补偿智能预测控制[J].电机与控制应用,2015,(9):1-7,13.Zhu Xiaoyu,Wang Dan,Peng Zhouhua,et al.Three-phase voltagebased inverter delay compensation model predictive control[J].Motor and Control Applications,2015,(9):1-7,13.
[15]K.Basu,A.Shahani,A.K.Sahoo and N.Mohan.A single-stage solid-state transformer for PWM AC drive with source-based commutation of leakage energy.in IEEE Transactions on Power Electronics,vol.30,no.3,pp.1734-1746,March 2015.