A new current-mode voltage-source parallel processing UPS is proposed in this paper. Although it uses only one power stage it has the performance of an active power line conditioner (APLC) and back-up power. The operation of the proposed UPS can be divided into two modes—APLC and back-up power modes. Due to the use of current-mode control in both operation modes, its transient performance at the moment of the change of operation mode is very good, and the output voltage of the back-up power mode will not be distorted under the nonlinear load. A prototype is developed and tested to verify its performance. The test results show that the proposed UPS has the expected performance.
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Jou et al. (1997) studied this question.
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