Control method for parallel power equalization of modular uninterruptible power supply
A control method and modular technology, applied in the direction of output power conversion device, emergency power supply arrangement, AC power input conversion to DC power output, etc., can solve the problem of uneven distribution of power and output current to the load, affecting UPS output characteristics, etc. question
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[0043] figure 1 Shown is the structure diagram of the parallel system of two modular uninterruptible power supplies (UPS) used in the present invention and its equivalent circuit model. The figure on the left is the structure diagram of the parallel system. The single-phase inverter is used to supply power to the load in parallel. The two parallel structures provide a loop for circulating current, and the load is connected to the resistive load R. L , L 1 , L 2 and C 1 , C 2 are the output filter inductors and capacitors of UPSI and UPSII, respectively, T 1 ~T 2 The upper and lower power switch tubes of UPSI and UPSII are in turn, and IGBTs are used here; E is the DC side voltage, i L1 and i L2 are the UPS filter inductor current, i C1 and i C2 is the filter capacitor current, i o1 and i o2 is the output current flowing to the load for UPSI and UPSII, i o is the load current, i h is the circulating current between UPSI and UPSII. The figure on the right shows the...
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