Principle of Supraharmonic Elimination Based on Random Carrier Sinusoidal Pulse Width Modulation for Converter Clusters

doi:10.11930/j.issn.1004-9649.202308013

Abstract

Abstract:

It is established by the voltage source converter supraharmonic model based on the principle of RC-SPWM. The relationship among the carrier randomness and amplitude as well as the phase randomness of supraharmonic is explored. The supraharmonic spectrum is distributed over a wider frequency range, and the amplitude of each supraharmonic approximates a normal distribution feature. The phases of supraharmonic approximate a uniform distribution feature due to the randomness of the carrier wave. The mechanism for supraharmonic elimination for converter clusters without carrier synchronization based on RC-SPWM is proposed, where the purpose of suppressing supraharmonic in a wide frequency range can be achieved. The simulation and experimental results demonstrate the effectiveness of the proposed supraharmonic elimination mechanism.

Key words: grid-connected inverter, power quality, supraharmonic elimination, random carrier sinusoidal pulse width modulation

Jiawei YANG, Yang YI, Hao JIANG, Lin ZHU, Zhiwei YAO. Principle of Supraharmonic Elimination Based on Random Carrier Sinusoidal Pulse Width Modulation for Converter Clusters[J]. Electric Power, 2023, 56(11): 160-167.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202308013

https://www.electricpower.com.cn/EN/Y2023/V56/I11/160

Figures/Tables 12

Fig.1 Typical AC/DC conversion topology

Fig.2 Carrier modulation of RC-SPWM

Fig.3 The model of parallel AC/DC converters

Table 1 The simulation parameters

算例	变换器个数	$ {f_{{\text{c}}0}} / \rm kHz$	$ {f_{{\text{c}}0\_1}}/ \rm kHz$	$ {f_{{\text{c}}0\_2}}/ \rm kHz$	$ {f_{{\text{c}}0\_3}}/ \rm kHz$
1	1	10
2	2		10	10
3	2		9	10
4	3		10	10	10

Table 2 The simulation results

算例	调制方式	谐波电流			谐波抑制率/%
算例	调制方式	频率/kHz	幅值/%	相位特点	谐波抑制率/%
1	TC-SPWM	9.9	1.341（固定）	固定	80.3
1	RC-SPWM	9.9	0.264 4	均匀分布	80.3
2	TC-SPWM	9.9	1.344（固定）	固定	86.7
2	RC-SPWM	9.9	0.179 3	均匀分布	86.7
3	TC-SPWM	8.9	0.728（固定）	固定	72.2
	TC-SPWM	9.9	0.648（固定）	固定
	RC-SPWM	9.9	0.180 1	均匀分布
4	TC-SPWM	9.9	1.318（固定）	固定	85.8%
4	RC-SPWM	9.9	0.187 0	均匀分布	85.8%

Fig.4 The FFT results of current Ig of PCC under TC-SPWM

Fig.5 The histograms with a normal distribution fit of the magnitudes of 9.9 kHz current Ig of PCC under RC-SPWM

Fig.6 The angle histogram of the phases of current Ig of PCC under RC-SPWM

Fig.7 The experimental platform

Fig.8 The FFT results of current Ig of PCC in case 1

Fig.9 The FFT results of current Ig of PCC in case 2

Fig.10 The FFT results of current Ig of PCC in case 3

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