Thermal Stress Analysis of Medium-Voltage Converters for Smart Transformers

Technical Reference for ET2001 Thermal Voltage Converters

Alternating Voltage Tests on Distribution Transformers Using Static Frequency Converters

This paper presents experience in performing alternating voltage measurements on distribution transformers using a static frequency converter without particular control scheme. Regarding induced voltage tests, no-load and load measurements, the quality, i.e. the degree of distortion and the symmetrical shape, of the generated test voltage, deviations in measured power and the relation between d...

Highly - Efficient and Modula Medium - Voltage Converters

3 I CONTROL OF THE DC-AC MMC FOR VARIABLE-SPEED DRIVE SYSTEMS 5 1.1 Glossary of terms 5 1.2 Introduction 6 1.3 The MMC 8 1.3.1 Dynamic Model 8 1.4 Low-Frequency Operation 9 1.4.1 The Existing Sine-wave Strategy 9 1.4.2 The Proposed Strategies 11 1.4.3 Comparison of the Proposed Strategies with the Sine-Wave Strategy 12 1.5 Controller Design Methodology 13 1.6 Closed-loop System 15 1.6.1 Closed-...

Analysis of High Frequency Planar Sandwich Transformers for Switching Converters

This paper presents the results of investigations on a planar sandwich air-gapped transformer with two different winding configurations. Experimental results of the coil self inductances, voltage ratio versus frequency, and the numerical results for the magnetic flux and eddy-current distributions are presented. It is shown that the voltage ratio and turns ratio are not equivalent and that the ...

Reliability in Medium Voltage Converters for Wind Turbines

In order to meet the demands of turbine integration into the wind park grids, advanced power converter technologies have successfully been developed by ABB. Along with the ongoing move from onshore to offshore wind installations, the system reliability, maintenance costs and product quality have come into focus to a far greater extent. Even the smallest service for offshore installations immedi...