An Improved Control and Energy Management Strategy of Three-Level NPC Converter Based DC Distribution Network

Yuqi Wang, Qingshan Xu, Zhoujun Ma and Hong Zhu
Additional contact information
Yuqi Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Qingshan Xu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Zhoujun Ma: State Grid Nanjing Supply Company, Nanjing 210008, China
Hong Zhu: State Grid Nanjing Supply Company, Nanjing 210008, China

Energies, 2017, vol. 10, issue 10, 1-19

Abstract: To meet the challenge of large-scale renewable energy penetration and take full advantage of existing AC infrastructure, the bipolar DC distribution system is of interest. In this article, the system structure and characteristics of the bipolar DC distribution network are proposed. The three-level Neural Point Clamped Converter (NPC) is used in the proposed system to construct the bipolar DC system. To optimize the DC system performance, an improved cooperative control and energy management strategy is proposed mainly to mitigate DC voltage fluctuation and balance the positive and negative phase voltage. The improved strategy consists of (1) 2-degree of freedom (2DOF) PID controller in traditional voltage control loop; (2) cooperative controller to take full advantage of storage system; (3) voltage equalization controller to balance two-phase voltages; and (4) the energy management system to dispatch the response job to batteries and supercapacitors. Experiments and simulations are performed to validate the effectiveness of the proposed strategy.

Keywords: DC distribution network; three-level NPC converter; energy management; cooperative control; bipolar system; voltage equalization; 2DOF controller (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/10/10/1635/pdf (application/pdf)
https://www.mdpi.com/1996-1073/10/10/1635/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:10:y:2017:i:10:p:1635-:d:115502

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().