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首页> 外文期刊>Power Electronics, IET >Protection of unified power quality conditioner against the load side short circuits
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Protection of unified power quality conditioner against the load side short circuits

机译：统一电能质量调节器针对负载侧短路的保护

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摘要

This study presents a protection scheme for protecting the series inverter of a unified power quality conditioner (UPQC). The proposed scheme protects the series inverter from overcurrents and overvoltages, which appear during short-circuit faults on the load side of the UPQC. The main protection element is a crowbar connected across the secondary of the series transformer and consists of a pair of antiparallel connected thyristors, which is governed by a simple Zener diode-based control circuit. In the case of an overvoltage, the crowbar short circuits the secondary of the transformer, thus removing the overvoltage and diverting the fault current from the series inverter. An additional circuit is used to disable the inverters in overcurrent conditions. The effectiveness of the proposed protection scheme is demonstrated both through simulation and experimentation.
机译：这项研究提出了一种保护方案，用于保护统一电能质量调节器（UPQC）的串联逆变器。所提出的方案保护串联逆变器免受过电流和过电压的影响，这些过电流和过电压在UPQC负载侧的短路故障期间出现。主保护元件是一个跨接在串联变压器次级之间的撬棍，由一对反并联晶闸管组成，该晶闸管由简单的基于齐纳二极管的控制电路控制。在过电压的情况下，撬棍使变压器的次级短路，从而消除了过电压并从串联逆变器转移了故障电流。附加电路用于在过电流条件下禁用逆变器。通过仿真和实验证明了所提出的保护方案的有效性。

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