模块化多电平变流器改进最近电平调制策略的研究
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摘要
针对传统的最近电平进行调制从而适合多电平、高电压的场合,但电平数偏少时输出波形质量会降低。对于传统调制方法存在的局限性,对最近电平调制进行了改进,在阶梯波产生时加入自变量的偏差量,调制波和阶梯波产生偏差,使系统输出电平数翻倍,降低总谐波失真THD值。最终在Matlab/Simulink中搭建MMC仿真模型,通过仿真结果对比加入不同偏差量时产生的输出谐波水平,得到最优偏差量,验证了该方法的正确性。
The quality of the output waveform is reduced when the traditional level modulation issuitable for multilevel, high voltage, and low level. Based on the limitations of the traditionalmodulation method, the latest level modulation is improved. When the step wave is generated, thedeviation of the independent variable is added, and the modulation wave and the step wave deviate, sothat the output level of the system is doubled, and the total harmonic distortion THD value is reduced.Finally, the MMC simulation model is built in Matlab/simulink. The simulation results are comparedwith the output harmonic level generated by adding different deviations, and the optimal deviation isobtained, which verifies the correctness of the method.
The quality of the output waveform is reduced when the traditional level modulation issuitable for multilevel, high voltage, and low level. Based on the limitations of the traditionalmodulation method, the latest level modulation is improved. When the step wave is generated, thedeviation of the independent variable is added, and the modulation wave and the step wave deviate, sothat the output level of the system is doubled, and the total harmonic distortion THD value is reduced.Finally, the MMC simulation model is built in Matlab/simulink. The simulation results are comparedwith the output harmonic level generated by adding different deviations, and the optimal deviation isobtained, which verifies the correctness of the method.
引文
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[8]Perez M,Rodriguez J,Pontt J,et al.Power distribution in hybrid multi-cell converter with nearest level modulation[C]//2007 IEEE International Symposium on Industrial Electronics,Proceedings,2007:736-741.
[9]郭捷,江道灼,周月宾,等.交直流侧电流分别可控的模块化多电平换流器控制方法[J].电力系统自动化,2011,35(7):42-47.
[10]Ilves K,Antonopoulos A,Harnefors L,et al.Capacitor voltage ripple shaping in modular multilevel converters allowing for operating region extension[C]//37th Annual Conference on IEEE Industrial Electronics Society,2011:4403-4408.
[11]Lin L,Lin Y,He Z,et al.Improved nearest-level modulation for a modular multilevel converter with a lower sub module number[J].IEEE Transactions on Power Electronics,2016,31(8):1-1.
[12]黄守道,彭也伦,廖武.模块化多电平型变流器电容电压波动及其抑制策略研究[J].电工技术学报,2015,30(7):62-71.
[13]刘普,王跃,雷万钧,等.模块化多电平变流器稳态运行特性分析[J].电工技术学报,2015,30(11):91-95.
[2]Marquardt R,Lesnicar A.New concept for high voltage modular multilevel converter[C]//Power Electronics Specialists Conference Aachen,Germany:IEEE,2004:1-5.
[3]管敏渊,徐政.模块化多电平换流器型直流输电的建模与控制[J].电力系统自动化,2010,34(19):64-68.
[4]Gemmell B,Dorn J,Retzmann D,et al.Prospects of multilevel VSC technologies for power transmission[C]//Proceedings of IEEE PES Transmission and Distribution Conference and Exposition,Chicago,IL,USA,2008,4:16.
[5]Allebrod S,Hamerski R,Marquardt R.New transformer less,scalable modular multilevel converters for HVDC transmission[C]//Proceedings of IEEE Power Electronics Specialists Conference,Rhodes,Greece,2008,6:15-19.
[6]Franquelo L G,Rodriguez J,Leon J I,et al.The age of multilevel converters arrives[J].IEEE Industrial Electronics Magazine,2008,2(2):28-39.
[7]管敏渊,徐政,屠卿瑞,等.模块化多电平换流器型直流输电的调制策略[J].电力系统自动化,2010,34(2):48-52.
[8]Perez M,Rodriguez J,Pontt J,et al.Power distribution in hybrid multi-cell converter with nearest level modulation[C]//2007 IEEE International Symposium on Industrial Electronics,Proceedings,2007:736-741.
[9]郭捷,江道灼,周月宾,等.交直流侧电流分别可控的模块化多电平换流器控制方法[J].电力系统自动化,2011,35(7):42-47.
[10]Ilves K,Antonopoulos A,Harnefors L,et al.Capacitor voltage ripple shaping in modular multilevel converters allowing for operating region extension[C]//37th Annual Conference on IEEE Industrial Electronics Society,2011:4403-4408.
[11]Lin L,Lin Y,He Z,et al.Improved nearest-level modulation for a modular multilevel converter with a lower sub module number[J].IEEE Transactions on Power Electronics,2016,31(8):1-1.
[12]黄守道,彭也伦,廖武.模块化多电平型变流器电容电压波动及其抑制策略研究[J].电工技术学报,2015,30(7):62-71.
[13]刘普,王跃,雷万钧,等.模块化多电平变流器稳态运行特性分析[J].电工技术学报,2015,30(11):91-95.