Open Access

ARTICLE

A DC Voltage Balancing Strategy Based on Active Vector Correction for Single-Phase Cascaded SST

Zhendong Ji¹, Shuzheng Wang², Yichao Sun³, Jianhua Wang⁴, Jianfeng Zhao⁴

1 School of Automation, Nanjing University of Science and Technology, Nanjing, China;
2 School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing, China;
3 School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing, China;
4 Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, Southeast University, Nanjing, China)

* Corresponding Author: Zhendong Ji,

Intelligent Automation & Soft Computing 2019, 25(4), 715-723. https://doi.org/10.31209/2019.100000075

Abstract

The disadvantages in power system with traditional industrial frequency transformer can be resolved by Solid State Transformer (SST). Cascaded SST can be transformerless connected to the high voltage grid. However, the output performance and reliability of cascaded SST are seriously influenced by DC voltage balancing problem which exists in cascaded configuration. In this paper, a DC voltage balancing strategy based on active vector correction is proposed. This strategy is characterized by on-demand active power and equal reactive power among modulars. Then, a quantitative analysis method is presented to validate active power adjusting ability of the traditional and the proposed strategies. Simulation and experimental results verify the feasibility and validity of these analysis and strategy.

---

Keywords

---