Residual flux impact in controlled switching of HVDC converter transformer

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ajay Kumar ◽  
Inderpreet Kaur ◽  
Urmil Parikh
Keyword(s):  
Circuit Breaker ◽  
Field Tests ◽  
Electrical Circuit ◽  
View Point ◽  
Controlled Switching ◽  
Core Saturation ◽  
Three Phase ◽  
Inrush Currents ◽  
Phase Converter ◽  
Programming Package

Abstract Converter transformers are an interface point of HVDC frameworks and are basic hardware from activity and reliability view point. Converter transformers are turned off intentionally under planned support and un-deliberately during fault conditions. Random energization of HVDC Converter transformer delivers high inrush currents due to core saturation asymmetries and endanger equipment health. In this paper, charging approach has been proposed. By utilizing point on wave exchanging for moderation of charging drifters during charging of 888 MVA 400/325 kV Converter Transformer of ±800 kV HVDC Sub-station. The proposed procedure has been applied on HVAC electrical Circuit Breaker furnished with Pre-Insertion Resistor considering diverse degree of residual flux. Performance of proposed philosophy has been affirmed by field tests and reproduction in PSCAD programming package and is found very viable. Near investigation is done in this paper and shows that with the use of proposed system, the switching transient during stimulation and field tests of coupled three phase converter transformers is decreased to worthy level.

Reduction of Three-Phase Transformer Inrush Currents Using Controlled Switching

2020 ◽  
Vol 56 (1) ◽  
pp. 890-897
Author(s):  
Joydeep Mitra ◽  
Xufeng Xu ◽  
Mohammed Benidris
Keyword(s):  
Controlled Switching ◽  
Three Phase ◽  
Inrush Currents

scholarly journals Attenuation of DC-Link Pulsation of a Four-Wire Inverter during Phase Unbalanced Current Operation

2021 ◽  
Vol 11 (3) ◽  
pp. 1322
Author(s):  
Dariusz Zieliński ◽  
Karol Fatyga
Keyword(s):  
Energy Storage ◽  
Control Algorithm ◽  
Reactive Power ◽  
Lithium Ion ◽  
Power Converter ◽  
Dual Active Bridge ◽  
Three Phase ◽  
Ion Storage ◽  
Energy Store ◽  
Phase Converter

This paper proposes a control algorithm for a hybrid power electronic AC/DC converter for prosumer applications operating under deep phase current asymmetry. The proposed system allows independent control of active and reactive power for each phase of the power converter without current pulsation on the DC link connected to an energy store. The system and its algorithm are based on a three-phase converter in four-wire topology (AC/DC 3p-4w) with two dual-active bridge (DC/DC) converters, interfaced with a supercapacitor and an energy storage. The control algorithm tests were carried out in a Hardware in the Loop environment. Obtained results indicate that operation with deep unbalances and powers of opposite signs in individual phases leads to current oscillations in the DC link. This phenomenon significantly limits energy storage utilization due to safety and durability reasons. The proposed algorithm significantly reduces the level of pulsation in the DC link which increases safety and reduces strain on lithium-ion storage technology, enabling their application in four-wire converter applications.

Field Tests at Grand Coulee Dam on 10,000-Mva 230-Kv Low-Oil-Content Impulse Circuit Breaker

1951 ◽  
Vol 70 (2) ◽  
pp. 1377-1385 ◽  
Author(s):  
A. F. Darland ◽  
C. L. Killgore ◽  
C. J. Balentine ◽  
E. B. Rietz
Keyword(s):  
Oil Content ◽  
Circuit Breaker ◽  
Field Tests ◽  
Grand Coulee Dam ◽  
Grand Coulee
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