A hybrid modulation strategy suitable for MMC with small quantities of sub-modules
As the voltage level is relatively low under medium and low voltage distribution network,the number of modular multilevel converter (MMC) sub-modules is also small. Therefore,the modulation mode of MMC with small quantities of sub-modules has an important influence on the performance of the MMC syst...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Power Engineering Technology
2022-09-01
|
| Series: | 电力工程技术 |
| Subjects: | |
| Online Access: | https://www.epet-info.com/dlgcjs/article/html/211029640 |
| _version_ | 1818017664615841792 |
|---|---|
| author | CHEN Jing ZHAO Tao XU You SUN Quan ZHANG Cheng CAO Yunkai |
| author_facet | CHEN Jing ZHAO Tao XU You SUN Quan ZHANG Cheng CAO Yunkai |
| author_sort | CHEN Jing |
| collection | DOAJ |
| description | As the voltage level is relatively low under medium and low voltage distribution network,the number of modular multilevel converter (MMC) sub-modules is also small. Therefore,the modulation mode of MMC with small quantities of sub-modules has an important influence on the performance of the MMC system. In order to improve the output quality and output capability of the MMC with small quantities of sub-modules,a hybrid modulation strategy suitable for MMC with small quantities of sub-modules based on level step switching at a high modulation degree is proposed. On the basis of the nearest level modulation (NLM),the MMC is controlled to switch between NLM and the carrier phase shift pulse width modulation (CPS-PWM) at the output level step point in real time. At the same time,the circulation control and the sub-module voltage equalization control are combined to further ensure the normal operation of MMC with small quantities of sub-modules under the hybrid modulation. Then,the simulation model of MMC hybrid modulation with four sub-modules is established,and a simulation study is carried out on the MMC hybrid modulation strategy of the MMC with small quantities of sub-modules. The results show that the proposed hybrid modulation strategy not only takes into account the characteristics of low output harmonics and low switching loss,but also improves its output quality. And its operation in high-profile system increases the DC voltage utilization rate and improves the output capacity of the MMC with small quantities of sub-modules. |
| first_indexed | 2024-04-14T07:30:46Z |
| format | Article |
| id | doaj.art-0dd707ecff6041338ae5370f9724ba2a |
| institution | Directory Open Access Journal |
| issn | 2096-3203 |
| language | zho |
| last_indexed | 2024-04-14T07:30:46Z |
| publishDate | 2022-09-01 |
| publisher | Editorial Department of Electric Power Engineering Technology |
| record_format | Article |
| series | 电力工程技术 |
| spelling | doaj.art-0dd707ecff6041338ae5370f9724ba2a2022-12-22T02:05:53ZzhoEditorial Department of Electric Power Engineering Technology电力工程技术2096-32032022-09-0141518619210.12158/j.2096-3203.2022.05.023A hybrid modulation strategy suitable for MMC with small quantities of sub-modulesCHEN Jing0ZHAO Tao1XU You2SUN Quan3ZHANG Cheng4CAO Yunkai5School of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaSchool of Automation, Nanjing Institute of Technology, Nanjing 211167, ChinaAs the voltage level is relatively low under medium and low voltage distribution network,the number of modular multilevel converter (MMC) sub-modules is also small. Therefore,the modulation mode of MMC with small quantities of sub-modules has an important influence on the performance of the MMC system. In order to improve the output quality and output capability of the MMC with small quantities of sub-modules,a hybrid modulation strategy suitable for MMC with small quantities of sub-modules based on level step switching at a high modulation degree is proposed. On the basis of the nearest level modulation (NLM),the MMC is controlled to switch between NLM and the carrier phase shift pulse width modulation (CPS-PWM) at the output level step point in real time. At the same time,the circulation control and the sub-module voltage equalization control are combined to further ensure the normal operation of MMC with small quantities of sub-modules under the hybrid modulation. Then,the simulation model of MMC hybrid modulation with four sub-modules is established,and a simulation study is carried out on the MMC hybrid modulation strategy of the MMC with small quantities of sub-modules. The results show that the proposed hybrid modulation strategy not only takes into account the characteristics of low output harmonics and low switching loss,but also improves its output quality. And its operation in high-profile system increases the DC voltage utilization rate and improves the output capacity of the MMC with small quantities of sub-modules.https://www.epet-info.com/dlgcjs/article/html/211029640medium and low voltage distribution networkmodular multilevel converter (mmc)nearest level modulation (nlm)carrier phase shifted pulse width modulation (cps-pwm)harmonic analysisvoltage equalization control |
| spellingShingle | CHEN Jing ZHAO Tao XU You SUN Quan ZHANG Cheng CAO Yunkai A hybrid modulation strategy suitable for MMC with small quantities of sub-modules 电力工程技术 medium and low voltage distribution network modular multilevel converter (mmc) nearest level modulation (nlm) carrier phase shifted pulse width modulation (cps-pwm) harmonic analysis voltage equalization control |
| title | A hybrid modulation strategy suitable for MMC with small quantities of sub-modules |
| title_full | A hybrid modulation strategy suitable for MMC with small quantities of sub-modules |
| title_fullStr | A hybrid modulation strategy suitable for MMC with small quantities of sub-modules |
| title_full_unstemmed | A hybrid modulation strategy suitable for MMC with small quantities of sub-modules |
| title_short | A hybrid modulation strategy suitable for MMC with small quantities of sub-modules |
| title_sort | hybrid modulation strategy suitable for mmc with small quantities of sub modules |
| topic | medium and low voltage distribution network modular multilevel converter (mmc) nearest level modulation (nlm) carrier phase shifted pulse width modulation (cps-pwm) harmonic analysis voltage equalization control |
| url | https://www.epet-info.com/dlgcjs/article/html/211029640 |
| work_keys_str_mv | AT chenjing ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT zhaotao ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT xuyou ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT sunquan ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT zhangcheng ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT caoyunkai ahybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT chenjing hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT zhaotao hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT xuyou hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT sunquan hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT zhangcheng hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules AT caoyunkai hybridmodulationstrategysuitableformmcwithsmallquantitiesofsubmodules |