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This paper presents a power-hardware-in-the-loop (PHiL) grid emulator (GE) which is based on switch-mode voltage source inverters (VSI) with the magnetic coupling. The grid emulator is controlled to reproduce the typical grid fault behaviors (under-voltage, interruption, frequency variation, fault-ride-through etc.) for the equipment under test (EUT). In past several different commercial grid emulators...
In order to avoid a bridge shoot-through, a simultaneous on-state of both IGBTs in a bridge leg is strictly forbidden. Therefore, the complementary switch is commonly turned on with a dead-time interval to ensure a complete turn-off the other IGBT. Due to the longer tail-current interval of IGBT switching process, for the purpose of absolute safe operation, the interlocking time to is empirically...
This paper presents a deadbeat-like predictive encoderless control method for back-to-back power converter permanent-magnet synchronous generator (PMSG) wind turbine systems with Extended Kalman Filter (EKF). The generator state variables are estimated through an EKF observer requiring neither the knowledge of mechanical parameters nor the initial position of the rotor. The estimated speed and position...
The increasing use of complex grid-connected technological components in safety-critical applications like public transportation or distributed power systems requires a precise evaluation of the reliability and robustness of these pieces of equipment during their development. Direct on-field tests of high-power systems are generally not possible. A conventional method of getting around this problem...
This paper presents the modelling and control algorithms comparison of a PHiL grid emulator which is based on a two level inverter with LC output filter. The grid emulator is controlled to emulate not only the stable state but also the typical transient of a utility grid. A 5kVA prototype PHiL emulator is implemented in our lab. By means of this grid emulator, the typical fault 0% voltage trip is...
The increasing use of complex grid-connected technological components in safety-critical applications like public transportation or distributed power systems requires a precise evaluation of the reliability and robustness of these pieces of equipment during their development. Direct on-field tests of high power systems are generally not possible. A conventional method of getting around this problem...
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