Change Detection Filter Technique of HVDC Transmission Link Fed by a Wind Farm

This research paper investigates the change detection filter technique (CDFT) with a decision tree-based event (fault type) classifier for recognizing and categorizing power system disturbances on the HVDC transmission link. A change detection filter is employed to the average and differential current components, which detects the point of fault initiation and records a change detection point (CDP). The half-cycle differential and average currents on both sides of the change detection point are sent through the signal processing unit, which produces the respective target. The extracted target indices are sent through a decision tree-based fault classifier mechanism for fault classification. In comparison with conventional differential current protection systems, the developed framework is faster in fault detection and classification, accuracy. The new technology allows for prompt identification of the fault category, allowing electrical grids to be restored as quickly as possible to minimize economic losses. This novel technology enhances efficiency in terms of reducing computing complexity. The suggested scheme's importance and accuracy have been rigorously validated for the standard HVDC transmission system, subjected to various types of DC fault, and the results show the proposed algorithm would be a feasible alternative to real-time applications.

I. INTRODUCTION

The adoption of renewable energy sources (RES), such as wind, fuel cells and solar has been proved as a efficiency is reduced length. The above number of challenges, including rising energy consumption, exhaustion of conventional energy resources (such as fossil energy), pollution and hazard and so on. For higher ratings, HVDC electrical power transmission systems are preferable than HVAC transmission systems. Losses in HVAC transmission lines generally increase as transmission distance increases due to increased resistance, inductance, and capacitance. When the skin effect and corona loss are takes place in HVAC, the transmission mentioned losses are overcome by the HVDC bipolar transmission system. In this connection, the protection of HVDC transmission lines in the power transmission network is a difficult and major problem that has been addressed in this article. The HVDC transmission line protection mechanism should ensure that the HVDC transmission system operates safely and reliably in the event of a fault . Overcurrent relays are appealing for HVDC transmission lines, however, the bandwidth of the fault current becomes quite broad owing to the intermittency of the power generation by the DERs, making them unstable[1]-[4].