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中文摘要：
以实际55 kW异步电机变频调速系统中的双PWM变换器为例,综合考虑功率器件特性、主电路结构、控制延迟、系统温度等因素,定量分析了其系统安全工作区.在得出了系统安全工作区数学模型的基础上,详细分析了控制延迟、直流母线杂散电感、交流滤波电感以及开关频率等因素对双PWM变换器的系统安全工作区边界的影响,并由此对实际系统的参数和保护进行了合理的设计,从而在保证系统安全的前提下,最大限度地提高器件的利用率和系统的持续运行能力.最后,实际系统的实验结果验证了所描述的系统安全工作区的正确性及其应用的有效性.
英文摘要：
The SSOA （Systematic Safe Operating Area） of a dual-PWM converter,applied in the frequencyvariable speed-regulation system of a 55 kW induction motor,is quantitatively studied on the characteristics of its power components,the structure of its main circuits,the delay of its control,the temperature rise of system,etc.Based on the mathematical model of SSOA,the impact of control delay,DC bus stray inductance,AC filter inductance and switching frequency on the boundaries of SSOA is analyzed in detail and the parameters and protections of practical system are properly designed to improve the utilization rate of power components and the continuously operating ability of system while the system safety is ensured.The experimental results of a practical system demonstrate the correctness of SSOA analysis and the effectiveness of its application.
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