Measurement means and experimental methods
For the HF current measurement, specialty workshop-made current transformers with a sensitivity of 0.01 V/A and Rogowski probes of PEM make, model CWT15, were used (Neau, E. L,1994). The latter were also used for the CC1 calibration. A standard high-precision Spellman voltage divider model HVD100 served for the HVDC measurement. A modified, compensated, and calibrated version, designated as HVD100C, was used for the transient measurements. HVD100C rise time is less than 2 μs.
The ripple was monitored by a specialized ripple checker comprising a blocking capacitor in series with a resistor, the voltage across which was measured by a P6015A Tektronix probe. Although the ripple did not exceed 1 kV at dc operation, such HV probe was needed to accommodate much higher transient voltages during turn-on. Floating voltage measurements were performed by a differential Tektronix probe P5200. A specialized nonlinear divider is used for the measurement of saturation voltages across the semiconductor switches.
Power measurements that are efficiency and power factor (PF) were taken using a Voltech power meter, model PM300. Temperatures were monitored by thermocouples connected to an Agilent data logger, model 34970A, with supporting BenchLink software. The input line voltage was regulated manually with a three phase variac in tests with a single module, at a power level of less than 30 kW. Thus, the input voltage could be adjusted continuously. At higher power, a three-phase line-frequency transformer with switchable taps was used. It allowed the simulation of the scenarios of low line, nominal line, and high line input voltages. The latter were not stabilized and varied slightly during the runs.
The point of measurement was the dc rail supply voltage V r. In this paper, the values of the latter corresponding to the aforementioned scenarios are defined as the ranges from 460 to 480 V, 510 to 530 V, and 580 to 600 V for the low line, nominal line, and high line input voltages, respectively. The V r variation from 460 to 590 V corresponds to the three phase 400 VAC-14%+10% line factoring in the voltage drop in the IR.
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