Methods for measuring the impedance of power conversion equipment are analyzed in order to show their general principle of implementation. A measuring system is proposed based on this principle as applied to power conversion equipment for testing power-supply systems of spacecrafts. The system allows measurement of the impedance modulus at frequencies ranging from 10 Hz to 10 MHz at a load voltage as high as 105 V. At the same time, the maximum load current (amplitude) in the frequency range of up to 70 kHz is 12.5 A or higher with an acceptable decrease in the maximum value to 10 A according to the linear law in the frequency range of 70-100 kHz. In the frequency range from 100 kHz to 10 MHz, the maximum current decreases with increasing frequency, but no more than by 20 dB/decade. A frequency-controlled load device has been developed for removing transient processes in power-conversion equipment used for testing power-supply systems of spacecraft. Using this device, it is possible to perform specific operating modes, such as variations of mutual transitions between the nominal mode and the short-circuit and idle modes.
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