一种基于系统安全工作区的变换器保护策略

为了解决电力电子装置的可持续运行能力和可靠性之间的矛盾,提出了一种基于系统安全工作区的变换器保护策略,通过对半导体器件特性、主电路结构参数、控制信号延迟和系统温度的量化分析推导了系统安全工作区的数学模型。该策略在量化考虑变换器中的各系统元素之间关系的基础上,不仅能够保障变换器不受损伤或损坏,还能够准确计算系统的保护阈值,提高半导体器件的利用率和变换器的可持续运行能力,成为能够保障变换器可靠性的重要工具。该方法同样适用于其他类型变换器的保护设计。给出了应用该方法设计变换器保护策略的实例,采用实验的方法验证了该方法的有效性。

Protection scheme for converter based on the systematic safe operating area

This paper presents a protection scheme for converters based on the systematic safe operating area(SSOA) to resolve the conflict between the ability of continuous operation and the reliability of power electronics converters.The mathematical model of SSOA was derived and presented through the quantitative analysis of the semiconductor device characteristics,parameters of main circuit,delay of signals and system temperatures.Based on the quantitative analysis of the relationship between the system elements of the converter,this method can not only protect the power devices from being damaged,but also can accurately calculate the protection thresholds and improve the utilization of power devices and the continuous operation ability of converters.Thus,this method becomes an important tool for ensuring the reliability of the converters which can also be applied to the protection design for other types of converters.An example of the application using this method was given with the experimental results showing the validity of this method.