Abstract
In this chapter, an overload and short-circuit protection method is proposed for voltage-source inverter-based uninterruptible power supply (UPS) system. In order to achieve high reliability and availability of the UPS, a short-circuit and overload protection scheme is necessary. When overload or short circuit happens, using the proposed control method, the amplitude of the output current can be limited to a constant value, which can be set by the customer to avoid the destruction of the power converter and to obtain a faster recovery performance as well. The detailed principle of the proposed protection method is discussed in this chapter. It mainly contains three parts in the control diagram for current limit, first is the anti-windup in the voltage and current controllers, then the feedforward of the capacitor voltage to the current control loop, the last is the fast reset of the resonant part of the current controller when overcurrent happens. The procedure of developing the control method is also presented in the paper. Experimental results on a commercial UPS system are presented to verify the effectiveness of the control method.
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04 May 2023
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Wei, B. (2023). Overload and Short-Circuit Protection Strategy for Voltage-Source Inverter-Based UPS. In: Lu, J., Wei, B., Hou, X., Sun, Y. (eds) Advanced Control and Protection of Modular Uninterruptible Power Supply Systems. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-031-22178-1_8
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