|
|
|
| A Modulation Strategy for Simultaneously Reducing High-Frequency Common-Mode Voltage of Indirect Matrix Converter |
| Lu Zijing1,2, Li Shanhu1,2, Cao Sunpeng1,2, Liu Xu1,2, Sun Qingguo1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China |
|
|
|
Abstract An indirect matrix converter (IMC) is a new generation of AC-AC converter with broad application prospects in ships, aerospace, and wind power. IMC is composed of a rectifier and an inverter stage. Affected by the pulse width modulation (PWM), a high-frequency and high-amplitude common mode voltage (CMV) will be generated at the output during IMC operation. The CMV will damage the insulation layer of the motor winding, increase the mechanical wear of the bearing and shorten the service life of the motor. Therefore, the CMV must be suppressed. Most of the CMV suppression strategies focus on reducing the peak value. The high-frequency CMV amplitude is inhibited by adding active or passive filters to the CMV path, which not only increases the mention and cost of the system but also reduces the compactness of the IMC. Based on the amplitude and positive/negative characteristics of CMV for IMC under the action of each active vector, this paper proposes a new modulation strategy to reduce the high-frequency CMV of IMC significantly. This method significantly reduces the high-frequency CMV amplitude by decreasing the positive and negative transition times and amplitude change range of the CMV in a carrier cycle.
Firstly, the rectifier and inverter stages are both divided into six sectors. The positive/negative characteristics of the CMV under the action of each active vector in each input sector are analyzed. Secondly, use active vectors that keep the direction of the CMV unchanged within an input sector for modulation. The rectifier stage selects two adjacent active current vectors in each input sector to synthesize the reference input current vector. The inverter stage selects active voltage vectors V2, V4, V6 in input sectors 1, 3, 5 and selects V1, V3, V5 in input sectors 2, 4, 6 to synthesize the reference output voltage vector. Thirdly, according to the three-phase output current direction of each inverter stage sector and the freewheeling characteristics of the freewheeling switching diodes, the switching sequence of the inverter stage active voltage vectors is arranged rationally to eliminate the CMV spikes caused by the dead zone effect. Fourthly, the traditional space vector modulation (SVM) method and two classical CMV suppression modulation strategies of IMC are selected to compare with the proposed method from the time and frequency domains. The time domain compares the CMV waveforms within one input sector and the switching sequences within one switching cycle. The CMV amplitude at n fc ( fc is the switching frequency of the IMC) is affected by the number of amplitude changes and the magnitude of the change in a switching cycle. The high-frequency amplitude of CMV for the other three strategies is larger than the proposed method because the direction of the three methods is constantly changing in an input sector. The frequency domain compares the CMV spectrum obtained by the triple Fourier transform of these four methods under the voltage transfer ratio (VTR) of 0.1~0.5. The CMV amplitude decreases under a specific VTR or frequency band, but it is still high in other cases. The CMV amplitude of the new method does not exceed 5% of the traditional SVM method in each high-frequency band and is almost unaffected by the VTR. Finally, simulations and experiments are carried out on the above four methods. The simulation and experiments confirm that the proposed strategy can suppress the CMV by 42.3% compared with the traditional method and greatly reduce the CMV amplitude of each high-frequency band.
|
|
Received: 02 June 2022
|
|
|
|
|
|
[1] 孙盼, 孙军, 吴旭升, 等. 间接矩阵变换器优化SVPWM及其简化的同步控制[J]. 电工技术学报, 2019, 34(10): 2187-2193.
Sun Pan, Sun Jun, Wu Xusheng, et al.Optimized space vector pulse width modulation and simplified synchronization control of indirect matrix conver- ter[J]. Transactions of China Electrotechnical Society, 2019, 34(10): 2187-2193.
[2] Dan Hanbing, Zeng Peng, Xiong Wenjing, et al.Model predictive control-based direct torque control for matrix converter-fed induction motor with reduced torque ripple[J]. CES Transactions on Electrical Machines and Systems, 2021, 5(2): 90-99.
[3] 梅杨, 易高. 间接矩阵变换器-异步电机调速系统模型预测控制权重系数自整定方法[J]. 电工技术学报, 2020, 35(18): 3938-3948.
Mei Yang, Yi Gao.A weighting factor self-tuning method in model prediction control for indirect matrix converter with induction motor system[J]. Transa- ctions of China Electrotechnical Society, 2020, 35(18): 3938-3948.
[4] Wang Chao, Zheng Zedong, Wang Kui, et al.Analysis and control of modular multilevel matrix converters under branch fault conditions[J]. IEEE Transactions on Power Electronics, 2022, 37(2): 1682-1699.
[5] 邱继浪, 何英杰, 焦乾明, 等. 非隔离型三电平逆变器漏电流抑制与中点电位平衡控制[J]. 电力系统自动化, 2021, 45(17): 161-170.
Qiu Jilang, He Yingjie, Jiao Qianming, et al.Leakage current suppression and balance control of neutral point potential for three-level transformerless inverter[J]. Automation of Electric Power Systems, 2021, 45(17): 161-170.
[6] 王付胜, 李祯, 付航, 等. 一种抑制系统漏电流非隔离型三电平逆变器中点平衡载波调制算法[J]. 电工技术学报, 2017, 32(增刊2): 128-138.
Wang Fusheng, Li Zhen, Fu Hang, et al.A new pulse-width modulation algorithm for the com- prehensive neutral-point balancing and leakage current reducing in the three-level transformerless inverter[J]. Transactions of China Electrotechnical Society, 2017, 32(S2): 128-138.
[7] Xu Yang, Wang Zheng, Liu Pengcheng, et al.The modular current-fed high-frequency isolated matrix converters for wind energy conversion[J]. IEEE Transactions on Power Electronics, 2022, 37(4): 4779-4791.
[8] Yerkal S A, Aware M V, Umre B S, et al.Common mode voltage elimination in a three-to-six phase indirect matrix converter using SVM technique[C]// 2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Jaipur, 2020: 1-6.
[9] Takahashi S, Ogasawara S, Takemoto M, et al.Common-mode voltage attenuation of an active common-mode filter in a motor drive system fed by a PWM inverter[J]. IEEE Transactions on Industry Applications, 2019, 55(3): 2721-2730.
[10] Jayaraman K, Kumar M.Design of passive common-mode attenuation methods for inverter-fed induction motor drive with reduced common-mode voltage PWM technique[J]. IEEE Transactions on Power Electronics, 2020, 35(3): 2861-2870.
[11] Kume T, Yamada K, Higuchi T, et al.Integrated filters and their combined effects in matrix con- verter[J]. IEEE Transactions on Industry Applications, 2007, 43(2): 571-581.
[12] 贾贵玺, 周晓畅, 李华. 高压变频器输出差模滤波器设计和共模电压抑制[J]. 电工技术学报, 2011, 26(增刊1): 161-165.
Jia Guixi, Zhou Xiaochang, Li Hua.Differential- mode filter design and common-mode voltage suppression at the high voltage VFD output ter- minals[J]. Transactions of China Electrotechnical Society, 2011, 26(S1): 161-165.
[13] Nguyen T D, Lee H H.Modulation strategies to reduce common-mode voltage for indirect matrix converters[J]. IEEE Transactions on Industrial Elec- tronics, 2012, 59(1): 129-140.
[14] Nguyen T D, Lee H H.A new SVM method for an indirect matrix converter with common-mode voltage reduction[J]. IEEE Transactions on Industrial Infor- matics, 2014, 10(1): 61-72.
[15] Padhee V, Sahoo A K, Mohan N.Modulation techniques for enhanced reduction in common-mode voltage and output voltage distortion in indirect matrix converters[J]. IEEE Transactions on Power Electronics, 2017, 32(11): 8655-8670.
[16] Tsoupos A, Khadkikar V.A novel SVM technique with enhanced output voltage quality for indirect matrix converters[J]. IEEE Transactions on Industrial Electronics, 2019, 66(2): 832-841.
[17] Su Mei, Lin Jianheng, Sun Yao, et al.A new modulation strategy to reduce common-mode current of indirect matrix converter[J]. IEEE Transactions on Industrial Electronics, 2019, 66(9): 7447-7452.
[18] Li Shanhu, Jin Zhaoyang, Liu Xu, et al.Open-current vector based SVM strategy of sparse matrix converter for common-mode voltage reduction[J]. IEEE Transa- ctions on Industrial Electronics, 2021, 68(9): 7757-7767.
[19] Tran Q H, Nguyen T D, Phuong L M.Simplified space-vector modulation strategy for indirect matrix converter with common-mode voltage and harmonic distortion reduction[J]. IEEE Access, 2020, 8: 218489-218498.
[20] Li Shanhu, Wang Wensheng, Han Xu, et al.A DPWM modulation strategy to reduce common-mode voltage for indirect matrix converters based on active-current vector amplitude characteristics[J]. IEEE Transa- ctions on Industrial Electronics, 2022, 69(8): 8102-8112.
[21] 郭艳华. MMC逆变器传导干扰研究[D]. 北京: 中国舰船研究院, 2016.
[22] Cacciato M, Consoli A, Scarcella G, et al.Reduction of common-mode currents in PWM inverter motor drives[J]. IEEE Transactions on Industry Applications, 1999, 35(2): 469-476.
[23] Janabi A, Wang Bingsen.Hybrid SVPWM scheme to minimize the common-mode voltage frequency and amplitude in voltage source inverter drives[J]. IEEE Transactions on Power Electronics, 2019, 34(2): 1595-1610.
[24] Massrur H R, Niknam T, Mardaneh M, et al.Harmonic elimination in multilevel inverters under unbalanced voltages and switching deviation using a new stochastic strategy[J]. IEEE Transactions on Industrial Informatics, 2016, 12(2): 716-725.
[25] 史维硕, 张昌浩, 韩俊飞, 等. 大功率并联电流源变流器五电平特定谐波消除法[J]. 电力系统自动化, 2021, 45(13): 167-175.
Shi Weishuo, Zhang Changhao, Han Junfei, et al.Five-level selective harmonic elimination method for high-power parallel current source converter[J]. Automation of Electric Power Systems, 2021, 45(13): 167-175.
[26] 李珊瑚, 黄林峰, 王文圣, 等. 零电压矢量作用时间对间接矩阵变换器输出电压共模分量与谐波分量的影响分析[J]. 中国电机工程学报, 2022, 42(21): 7943-7955.
Li Shanhu, Huang Linfeng, Wang Wensheng, et al.Effect of two zero voltage vectors action time on the common-mode and harmonic components of output voltage of indirect matrix converter[J]. Proceedings of the CSEE, 2022, 42(21): 7943-7955. |
|
|
|
2023, Vol. 38 
