Design and evaluation of voltage control techniques by hierarchical coordination of multiple power converters in low-voltage dc distribution systems

Author(s):  
Il-Yop Chung Il-Yop Chung ◽  
Phi Hai Trinh Phi Hai Trinh ◽  
H. Cho ◽  
Ju-Yong Kim Ju-Yong Kim ◽  
Jin-Tae Cho Jin-Tae Cho ◽  
...  
Energies ◽  
2017 ◽  
Vol 10 (1) ◽  
pp. 41 ◽  
Author(s):  
Trinh Hai ◽  
Hector Cho ◽  
Il-Yop Chung ◽  
Hyun-Koo Kang ◽  
Jintae Cho ◽  
...  

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 338
Author(s):  
Leslie Tracy ◽  
Praveen Kumar Sekhar

In this study, a low voltage solid-state circuit breaker (SSCB) was implemented for a DC distribution system using commercially available components. The design process of the high-side static switch was enabled through a voltage bias. Detailed functional testing of the current sensor, high-side switch, thermal ratings, analog to digital conversion (ADC) techniques, and response times of the SSCB was evaluated. The designed SSCB was capable of low-end lighting protection applications and tested at 50 V. A 15 A continuous current rating was obtained, and the minimum response time of the SSCB was nearly 290 times faster than that of conventional AC protection methods. The SSCB was implemented to fill the gap where traditional AC protection schemes have failed. DC distribution systems are capable of extreme faults that can destroy sensitive power electronic equipment. However, continued research and development of the SSCB is helping to revolutionize the power industry and change the current power distribution methods to better utilize clean renewable energy systems.


2020 ◽  
Vol 35 (5) ◽  
pp. 2252-2259
Author(s):  
Yizhen Wang ◽  
Jinwei He ◽  
Yuming Zhao ◽  
Guowei Liu ◽  
Jie Sun ◽  
...  

Author(s):  
Simone Negri ◽  
Enrico Tironi ◽  
Gabrio Superti-Furga ◽  
Giovanni Ubezio

2022 ◽  
Vol 202 ◽  
pp. 107572
Author(s):  
Zhiyu Wei ◽  
Ke Peng ◽  
Chuanliang Xiao ◽  
Yan Li ◽  
Xueshen Zhao ◽  
...  

2019 ◽  
Vol 9 (5) ◽  
pp. 952 ◽  
Author(s):  
S. Mohamed ◽  
P. Jeyanthy ◽  
D. Devaraj ◽  
M. Shwehdi ◽  
Adel Aldalbahi

The high penetration level of solar photovoltaic (SPV) generation systems imposes a major challenge to the secure operation of power systems. SPV generation systems are connected to the power grid via power converters. During a fault on the grid side; overvoltage can occur at the direct current link (DCL) due to the power imbalance between the SPV and the grid sides. Subsequently; the SPV inverter is disconnected; which reduces the grid reliability. DC-link voltage control is an important task during low voltage ride-through (LVRT) for SPV generation systems. By properly controlling the power converters; we can enhance the LVRT capability of a grid-connected SPV system according to the grid code (GC) requirements. This study proposes a novel DCL voltage control scheme for a DC–DC converter to enhance the LVRT capability of the two-stage grid-connected SPV system. The control scheme includes a “control without maximum power point tracking (MPPT)” controller; which is activated when the DCL voltage exceeds its nominal value; otherwise, the MPPT control is activated. Compared to the existing LVRT schemes the proposed method is economical as it is achieved by connecting the proposed controller to the existing MPPT controller without additional hardware or changes in the software. In this approach, although the SPV system will not operate at the maximum power point and the inverter will not face any over current challenge it can still provide reactive power support in response to a grid fault. A comprehensive simulation was carried out to verify the effectiveness of the proposed control scheme for enhancing the LVRT capability and stability margin of an interconnected SPV generation system under symmetrical and asymmetrical grid faults.


Author(s):  
Leonardo Nozari da Silva ◽  
Gustavo Scherer Djambolakdjian ◽  
Bruno Alves de Andrade ◽  
Cassiano Souza Krenn ◽  
Larissa Ananda Hansen ◽  
...  

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