Abstract
An electric machine emulator (EME) system plays a fundamental role in design and validation of hardware and software for power electronic converters and electric drives. In this paper, a desktop digital signal processor (DSP)-based EME is developed for power converters function test. The principle of EME is demonstrated with mathematical derivation. Since the instantaneous phase voltage is either power supply voltage or ground, high-rated voltage sensors are not suitable for DSP-based EME to obtain the average voltage in a pulse-width modulation cycle. To accurately acquiring phase voltages, a method which reconstructs the phase voltage considering the amplitude and duty cycle error is proposed. Voltage drops, dead time, propagation delay, parasitic rising and falling time delay are all considered in reconstructed voltages based on voltage-second balance theory. This is accomplished without any assistant physical circuits. Based on the reconstructed phase voltages, reference current is derived in motor model by using second order Runge-Kutta method. Factors affecting phase voltage accuracy are verified by simulations step by step. The simulation and experimental results support the validity of the proposed method.
Highlights
The development and validation of power electronics of motor control units (MCU) are facing great challenges since the existing facilities do not fit desired requirements
It consists of output filters, power amplification unit (PA), interface algorithms (IA), real-time digital system (RTDS) and
When current at the falling edge Tf is negative, the time Tf is short enough to be omitted since the parasitic capacitor is connected to negative pole of direct current (DC) link directly after the lower switch is under operation
Summary
The development and validation of power electronics of motor control units (MCU) are facing great challenges since the existing facilities do not fit desired requirements. Wang: Desktop EME Implementation Method Based on Phase Voltage Reconstruction. This structure may bring complexity like common mode current [5] and branch current balance problem [14]. The terminal voltage sampling method can be divided into two types: the high-rated AD chip to capture the instantaneous line-line voltage [20] and the voltage integrator to calculate equivalent voltage in a given time [21]. The high-rated AD chip (higher than 1MHz) can just be used on FPGA-based EME system since the motor model calculating frequency is at about 1MHz or higher. An accurate phase voltage sampling method based on phase voltage reconstruction used on DSP-based EME system is proposed.
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