Diagnosis Method for GTO Open Switch Fault Applied to Reconfigurable Three-Level 48-Pulse STATCOM

Omar Fethi Benaouda,Bilal Djamal Eddine Cherif,Azzedine Bendiabdellah

doi:10.15598/aeee.v17i2.3192

Abstract

In the recent years, several research works are focusing on the use of STATCOM in electrical networks because it is used to regulate the voltage, to improve the dynamic stability of the power system besides allowing better management of the power flow. All these positive tasks have guaranteed an important position of STATCOM within a family of Flexible Alternating Current Transmission System (FACTS). In this paper study, the control and operation of a three levels 48-pulse GTO based STATCOM is implemented with series connected transformers. The system may, unfortunately, be prone to GTO switch faults and therefore may affect reactive power transiting. In this paper, a new diagnostic approach is proposed based on the Single-Sided Amplitude Spectrum (SSAS) method of the three-leg converter currents for detection and localization of open-circuit faults. The integration of the STATCOM reconfigurable fault tolerant to the system is also considered to ensure service continuity. Several results are presented and discussed in this paper to illustrate the performance of the STATCOM fault-tolerant diagnostic.

Highlights

The systems of Flexible Alternating Current Transmission (FACTS) have become available worldwide due to the growing demand for energy; these systems gener-In electrical systems that include power converters, several faults may appear in the converter, on its switch control [12] or in the physical semiconductor component itself [13]
It is important to note that before the instant 0.05 s, the source voltage equals 1 pu, while the secondary voltage Vsa of the bus B1 equals 1 pu and the primary current Ia Prim takes the value 0 pu. This situation indicates the non-intervention of the STATic COMpensator (STATCOM); the DC voltage equals 1 pu and the reactive power is stable to its value of zero
The source voltage decreases to the value of 0.979 pu allowing the intervention of the STATCOM to generate 70 MVAR of the reactive power with a dynamic response time equals to 47 ms

Summary

Introduction

The systems of Flexible Alternating Current Transmission (FACTS) have become available worldwide due to the growing demand for energy; these systems gener-In electrical systems that include power converters, several faults may appear in the converter, on its switch control [12] or in the physical semiconductor component itself [13]. The systems of Flexible Alternating Current Transmission (FACTS) have become available worldwide due to the growing demand for energy; these systems gener-. In the STATCOM sysc 2019 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING tem, the converter has two operating modes; either as a rectifier or an inverter; in accordance with the source of the voltage change. These devices are very sensitive to a fault in terms of reliability and the detection and localization of faults become a necessity and are the most profitable. The faults can be classified as short-circuit faults and open-circuit faults [16] and [17]. Some diagnostic methods have been developed for converters in the last decade by many researchers like Mendes, Abramik, Peuget and all [18] and [19]

Methods

Results

Conclusion