基于随机载波脉冲宽度调制的变换器群超高次谐波抑制机理

doi:10.11930/j.issn.1004-9649.202308013

摘要/Abstract

摘要：

基于随机载波正弦脉冲宽度调制技术的原理，建立在随机载波正弦脉冲宽度调制下电压源变换器输出超高次谐波模型，研究载波频率随机性与超高次谐波幅值和相位随机性之间的关系。超高次谐波频谱分布更宽，且幅值近似服从正态分布特征，载波随机性导致超高次谐波相位随机性，并基本呈现均匀分布特征。利用此特征，研究载波未同步的变换器群发射超高次谐波的超高次谐波叠加相消原理，提出基于随机载波正弦脉冲宽度调制的变换器群超高次谐波抑制机理，以达到广泛频段内超高次谐波抑制的目的。仿真和实验结果表明，特定次超高次谐波幅值及相位特征符合理论分析，该超高次谐波抑制机理可行有效。

关键词: 并网逆变器, 电能质量, 超高次谐波抑制, 随机载波正弦脉冲宽度调制

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

杨嘉伟, 易杨, 姜浩, 朱林, 姚志伟. 基于随机载波脉冲宽度调制的变换器群超高次谐波抑制机理[J]. 中国电力, 2023, 56(11): 160-167.

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.

导出引用管理器 EndNote|Ris|BibTeX

链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202308013

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

图/表 12

图 1 典型的交直流变换拓扑

Fig.1 Typical AC/DC conversion topology

图 2 RC-SPWM载波调制

Fig.2 Carrier modulation of RC-SPWM

图 3 交直流变换器并列系统模型

Fig.3 The model of parallel AC/DC converters

表 1 仿真算例参数

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

表 2 算例仿真结果

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%

图 4 TC-SPWM下PCC节点电流频谱

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

图 5 RC-SPWM下PCC节点9.9 kHz谐波电流幅值分布

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

图 6 RC-SPWM下PCC节点谐波电流相位分布

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

图 7 实验平台

Fig.7 The experimental platform

图 8 算例1 PCC节点电流频谱

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

图 9 算例2 PCC节点电流频谱

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

图 10 算例3 PCC节点电流频谱

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

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