Suppression of common‐mode voltage spectral peaks by using rotation reverse carriers in sinusoidal pulse width modulation three‐phase inverters with CFM

Abstract

The common-mode interference in three-phase inverters is a prominent problem and is hard to be suppressed. The common-mode voltage (CMV) is an important source of common-mode interference. The spectral peaks of CMV can be suppressed markedly through carrier frequency modulation (CFM) in three-phase inverters. The multi-carrier technology can be used to further suppress the spectral peaks of CMV, but it is not easy to achieve in the CFM case because of the changing carrier frequency. A new method, which is named the rotation reverse carriers (RRC) scheme, is presented to solve this problem here. In this scheme, the three-phase carriers reverse in turn so that some peaks can be counteracted in the CMV spectrum. This leads to a further reduction in spectral peaks of CMV based on the effect obtained by using CFM. Using the RRC scheme can also ensure the balance of three output voltages. In order to reduce the adverse effects on differential-mode characteristics, the RRC scheme is also optimised here. The total harmonic distortion is lowered by the use of an optimal RRC scheme. The feasibility and effectiveness of the proposed RRC scheme are verified by the simulations and experimental results in a threephase inverter.

A four-state CBPWM technique for common-mode voltage reduction in two-level inverter

“…Ngoài ra, trong các hệ thống PV kết nối lưới sử dụng mạch VSI điều khiển bằng PWM và không sử dụng máy biến áp, CMC sinh bởi CMV sẽ chạy qua các điện dung tản giữa các tấm pin mặt trời và xuống đất, sinh ra các vấn đề về an toàn điện [6]. Nhiều giải pháp điều khiển giảm CMV (RCMV) khác nhau đã được đề xuất và có thể chia làm nhóm giải pháp phần cứng 4,[8][9][10][11][12][13][14] và nhóm giải pháp phần mềm [15][16][17][18][19][20][21][22][23][24][25][26][27] . Nhược điểm của giải pháp phần cứng là cần sử dụng thêm linh kiện, do đó làm tăng kích thước và chi phí của hệ thống.…”

Novel Hybrid Modulation Method for Modular Multilevel Converter Based Energy Storage System

“…For motor drive applications, a modulation method combining steady-state SHEPWM and transient CPS-PWM has been proposed in Ref. [20]. But in grid-connected applications with relatively severe grid voltage distortion, the current harmonic characteristics of the system output may worsen [21].…”

Common-Mode Reduction SVPWM for Three-Phase Motor Fed by Two-Level Voltage Source Inverter

“…However, the CMV frequency has not been reduced and is still equal to or close to the switching frequency of the inverter. What is more, some harmonic components of the CMV increase slightly [18]. If the frequency of these harmonic components is close to the common-mode resonance frequency of the system, the corresponding common-mode current will be significantly amplified, which is dangerous for system reliability.…”