Research on Low Voltage Ride Through Control Method of H-Bridge Cascade Converter Based on RTDS

Zhiqiang  Zhou; Yu Shen; Chengkuan  Wan; Wei  Hu; Tao  Wang; Hao Tang

doi:10.6180/jase.201909_22(3).0017

Research on Low Voltage Ride Through Control Method of H-Bridge Cascade Converter Based on RTDS

Zhiqiang Zhou¹, Yu Shen ¹, Chengkuan Wan^2,3, Wei Hu¹, Tao Wang¹ and Hao Tang³

¹Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd, Wuhan 430077, P.R. China
²Chengdu Star-river Technology Industry Co., Ltd, Chengdu 610041, P.R. China
³School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, P.R. China

Received: December 17, 2018
Accepted: May 14, 2019
Publication Date: September 1, 2019

Download Citation: ||https://doi.org/10.6180/jase.201909_22(3).0017

ABSTRACT

This paper proposes an improved classified and time-divided low voltage ride through control method of cascade converter, aiming at solving operation problem of H-Bridge cascade converter during grid voltage dropping process. In addition, a DC voltage adaptive equalization control method is put forward to solve DC voltage imbalance problem of H-Bridge cascade converter in the dropping process. Finally, a 10 Mvar H-Bridge cascade converter device is designed and verified on the RTDS experimental platform. The experimental results show that the H-Bridge cascade converter under the improved control strategy can keep the device from off-grid operation in the grid voltage dropping process and provide the maximum reactive power support while maintaining DC voltage balance of the H-Bridge cascade converter power unit.

Keywords: H-Bridge Cascade Converter, Low Voltage Ride Through, RTDS Simulation, DC Bus Voltage Balance Control

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