Double-band Selective Harmonic Elimination Method for Five-level Inverter with Low Switching Frequency

doi:10.11985/2023.04.019

Abstract

Abstract:

When solving the nonlinear equations of specific harmonic elimination of multi-level inverter, the traditional method at low switching frequency has the problems of difficult selection of initial values, the complex transformation of nonlinear equations, and it is easy to obtain local optimal solutions. A new harmonic elimination method for multilevel inverter is proposed. Firstly, the nonlinear equations are transformed by using the trigonometric function formula, and then constraint condition are assumed to transform the nonlinear equations into linear equations for solving. Taking five-level modified packed U-cells(MPUC) as the research object, exact solutions in [0,1.15] are obtained by combining the double-band SHEPWM control method with the new method. The new method is compared with the intelligent algorithm. The comparison shows that the new method has better total harmonic distortion rate(THD) under low modulation. Finally, simulation and experiment show that the new method can effectively eliminate the fifth harmonic of the five-level inverter.

Key words: Low switching frequency, selective harmonic elimination, nonlinear equations, MPUC inverter, trigonometric function, linear equations

CLC Number:

TM464

LI Guohua, YUAN Zhaoming. Double-band Selective Harmonic Elimination Method for Five-level Inverter with Low Switching Frequency[J]. Journal of Electrical Engineering, 2023, 18(4): 171-178.

Figures/Tables 16

References 17

[1]	叶元茂, 陈仕铠, 华特科. 具有低电压应力的新型开关电容七电平逆变器[J]. 中国电机工程学报, 2021, 41(13):4628-4636.
	YE Yuanmao, CHEN Shikai, HUA Teke. A novel switched-capacitor seven-level inverter with low voltage stress[J]. Proceedings of the CSEE, 2021, 41(13):4628-4636.
[2]	张兵峰, 王铁军, 冯进. 一种谐波注入式逆变装置研究[J]. 电气工程学报, 2019, 14(3):90-96.
	ZHANG Bingfeng, WANG Tiejun, FENG Jin. Research on a harmonic injection inverter[J]. Journal of Electrical Engineering, 2019, 14(3):90-96.
[3]	丁金勇, 吕建国, 徐炜基, 等. 弱电网下基于模型预测控制的NPC三电平LCL型并网逆变器谐振抑制方法研究[J]. 电气工程学报, 2021, 16(2):190-198.
	DING Jinyong, LÜ Jianguo, XU Weiji, et al. Research on resonance suppression method of LCL-filtered NPC 3-level grid-connected inverter based on model predictive control in weak grid[J]. Journal of Electrical Engineering, 2021, 16(2):190-198.
[4]	VAHEDI H, SHARIFZADEH M, AI-HADDAD K. Modified seven-level pack U-cell inverter for photovoltaic applications[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6:1508-1516. doi: 10.1109/JESTPE.2018.2821663
[5]	过亮, 黄勇, 瞿兴鸿. 基于SHEPWM的级联五电平高频逆变器[J]. 电力电子技术, 2021, 55(1):95-99.
	GUO Liang, HUANG Yong, QU Xinghong. Cascaded five-level high frequency inverter based on SHEPWM[J]. Power Electronics, 2021, 55(1):95-99.
[6]	齐昕, 周珂, 王长松, 等. 中高功率交流电机逆变器的低开关频率控制策略综述[J]. 中国电机工程学报, 2015, 35(24):6445-6458.
	QI Xin, ZHOU Ke, WANG Changsong, et al. Control strategies for medium and high power AC machine inverters at low switching frequencies:An overview[J]. Proceedings of the CSEE, 2015, 35(24):6445-6458.
[7]	LODI K A, AZEEM A, TARIQ M, et al. Harmonic minimization in modified PUC-5 inverter using genetic algorithm[C]// 2018 IEEE International Conference on Power Electronics,Drives and Energy Systems(PEDES), December 18-21,2018,Chennai,India. IEEE, 2018:1-6.
[8]	李贵彬, 李永东, 郑泽东, 等. 提高机车牵引电机动态性能的同步SHEPWM调制方法[J]. 高电压技术, 2019, 45(6):1803-1810.
	LI Guibin, LI Yongdong, ZHENG Zedong, et al. Synchronous SHEPWM modulation method for dynamic performance of locomotive traction motor[J]. High Voltage Engineering, 2019, 45(6):1803-1810.
[9]	李国华, 李文悍. 基于差分进化算法的逆变器SHEPWM方法的研究[J]. 电力系统保护与控制, 2019, 47(17):32-38.
	LI Guohua, LI Wenhan. Research on the SHEPWM technique applied to inverter based on differential evolution algorithms[J]. Power System Protection and Control, 2019, 47(17):32-38.
[10]	郑春芳, 张波. 基于Walsh变换的逆变器SHEPWM技术[J]. 电工技术学报, 2005, 20(5):65-71.
	ZHENG Chunfang, ZHANG Bo. Inverter SHEPWM technique based on Walsh transform[J]. Transactions of China Electrotechnical Society, 2005, 20(5):65-71.
[11]	叶满园, 蔡鸿, 李宋. 基于DSP在线实现特定谐波消除技术的2种方法[J]. 电力自动化设备, 2015, 35(2):114-120.
	YE Manyuan, CAI Hong, LI Song. Two DSP-based methods of online specific harmonic elimination[J]. Electric Power Automation Equipment, 2015, 35(2):114-120.
[12]	杨克虎, 唐欣, 张奇, 等. 阶梯波多电平变换器特定谐波消除的完全解[J]. 电机与控制学报, 2017, 21(2):27-34.
	YANG Kehu, TANG Xin, ZHANG Qi, et al. Complete solutions for selective harmonic elimination problem of multilevel staircase converter[J]. Electric Machines and Control, 2017, 21(2):27-34.
[13]	韩祥鹏. T型三电平逆变器PWM调制策略的研究[D]. 南昌: 华东交通大学, 2018.
	HAN Xiangpeng. Research on pulse width modulation strategy of T-type three-level inverter[D]. Nanchang: East China Jiaotong University, 2018.
[14]	KAVOUSI A, VAHIDI B, SALEHI R, et al. Application of the bee algorithm for selective harmonic elimination strategy in multilevel inverters[J]. IEEE Transactions on Power Electronics, 2012, 27(4):1689-1696. doi: 10.1109/TPEL.2011.2166124
[15]	叶满园, 蔡鸿, 黎冰, 等. 五电平逆变器双波段SHEPWM控制方法研究[J]. 工矿自动化, 2014, 40(11):55-60.
	YE Manyuan, CAI Hong, LI Bing, et al. Study of five-level inverter double-band SHEPWM control method[J]. Industry and Mine Automation, 2014, 40(11):55-60.
[16]	叶满园, 周琪琦, 蔡鸿, 等. 基于多种群遗传算法的多电平逆变器多波段SHEPWM技术[J]. 电工技术学报, 2015, 30(16):111-119.
	YE Manyuan, ZHOU Qiqi, CAI Hong, et al. Multiple population genetic algorithm based on multi-band SHEPWM control technology for multi-level inverter[J]. Transactions of China Electrotechnical Society, 2015, 30(16):111-119.
[17]	叶满园, 蔡鸿, 李宋, 等. 优化多电平逆变器多波段SHEPWM控制技术[J]. 电力电子技术, 2014, 48(9):55-57.
	YE Manyuan, CAI Hong, LI Song, et al. Optimized multiband SHEPWM control method for multilevel inverter[J]. Power Electronics, 2014, 48(9):55-57.

开关状态	T₁	T₂	T₃	T₄	T₅	T₆	u_AB
1	1	0	1	0	1	0	2E
2	1	0	0	0	1	1	E
3	0	0	1	1	1	0	E
4	1	1	1	0	0	0	0
5	0	0	0	1	1	1	0
6	1	1	0	0	0	1	-E
7	0	1	1	1	0	0	-E
8	0	1	0	1	0	1	-2E