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作 者:孙帆 王金梅 鲁娅楠 Sun Fan;Wang Jinmei;Lu Ya’nan(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021;Key Laboratory of Ningxia Electric Power and Energy Security Autonomous Region,Ningxia University,Yinchuan 750021)
机构地区:[1]宁夏大学物理与电子电气工程学院,银川750021 [2]宁夏沙漠信息智能感知自治区重点实验室,银川750021
出 处:《电气技术》2019年第2期23-27,共5页Electrical Engineering
基 金:国家自然科学基金项目(51167015)
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 is suitable for multilevel, high voltage, and low level. Based on the limitations of the traditional modulation method, the latest level modulation is improved. When the step wave is generated, the deviation of the independent variable is added, and the modulation wave and the step wave deviate, so that 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 compared with the output harmonic level generated by adding different deviations, and the optimal deviation is obtained, which verifies the correctness of the method.
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