Abstract
This paper studies the average value modelling (AVM) of medium frequency (200 Hz-2000 Hz) dc-dc converters, which are becoming increasingly important in high-power dc grids and distributing microgrids. The most convenient modelling is based on transfer function and power components which are available in common simulation platforms, such as PSCAD/EMTDC. However, these models are found to require very small simulation steps and the achieved time-domain accuracy is not satisfactory for medium frequency converters. The core issue of accuracy loss is identified and corresponding improvement is proposed. User written state-space models in the abc frame and the dq frame are analyzed in depth. Different solvers, including the Dommel's method, the Heun's method, and the Runge-Kutta method were adopted and compared in solving the state-space models. A high-power 2-kHz LCL dc-dc converter is taken as the test system. It is found that the AVM in the dq rotating frame based on the Runge-Kutta solver is able to generate very accurate time-domain responses compared to the detailed switching model with almost 100 times improvement in simulation speed. It is demonstrated that a dc-dc converter with 2-kHz inner ac circuit frequency can be accurately simulated at a 50- μs time step.
Original language | English |
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Pages (from-to) | 281-289 |
Number of pages | 9 |
Journal | IEEE Transactions on Power Delivery |
Volume | 30 |
Issue number | 1 |
Early online date | 20 May 2014 |
DOIs | |
Publication status | Published - Feb 2015 |
Bibliographical note
This work was supported by the European Research Council under the Ideas program in FP7 under Grant 259328, 2010. Paper no. TPWRD-00067-2014Keywords
- DC–DC power conversion
- HVDC transmission
- numerical stabilty
- power system simulation
- power system transients
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Dragan Jovcic
- Engineering, Aberdeen HVDC Research Centre
- Centre for Energy Transition
- Engineering, Engineering - Chair in Engineering
Person: Academic