Low-Voltage Ride Through Strategy for MMC With Y0-Y0 Arrangement Transformer Under Single-Line-to-Ground Fault

Project Code :TEMAPE171

Objective

The main objective of this project is to deliver the power without interruptions in the supply.

Abstract

In this project, the offshore wind farm high-voltage direct-current (HVDC) system, the power delivery capability of the onshore modular multilevel converter (MMC) decreases severely under grid fault, which makes the DC-bus voltage increase rapidly and threatens the safe operation of the system.

This paper proposes a low-voltage ride through (LVRT) strategy for MMC with Y0/Y0 arrangement transformer under single-line-to-ground (SLG) fault. The influence of different transformer arrangements to the MMC under SLG fault is analyzed. On this basis, a power delivery capability enhanced method is proposed for MMC with Y0/Y0 arrangement transformer to take advantage of its control ability on zero sequence current.

In addition, an optimized LVRT strategy based on resonant controller is proposed, which has simple control structure and can ride through the SLG fault without DC chopper. The offshore wind farm MMC-HVDC simulation system is simulated by using Matlab/Simulink Software and simulation studies are conducted to validate the effectiveness of the proposed LVRT strategy.

Keywords: Modular multilevel converter (MMC), grid fault, high-voltage direct-current (HVDC), low-voltage ride through (LVRT).

NOTE: Without the concern of our team, please don't submit to the college. This Abstract varies based on student requirements.