电梯回生电阻的温升研究

Study on temperature rise of lift retrogradation resistance

为了限制再生制动状态时电梯变频器直流侧的泵升电压,通常采用能耗制动的方式通过回生电阻消耗过剩的能量,从而使电容两端的电压维持在安全范围内。然而处在工作过程中的回生电阻发热严重威胁着变频器的工作安全,因此提出用MATLAB/SIMULINK软件搭建VVVF交流调速仿真模型,分析加入制动前后变频器工作状况,以求解出满足制动要求的电容电压波形。同时,通过C++编程求解出短期发热过程中电阻的温升特性曲线,以便研究电阻的温升趋势,采取相应的冷却措施。

In order to restrict the pumping voltage at lift inverter dc side under the circumstance of regenerative braking,dynamic braking is adopted to keep the voltage between two ends of capacitance safe by retrogradation resistance consuming the excess energy. The temperature rise of working retrogradation resistance, however, seriously threatens the security of inverter. This paper proposes, therefore, the VVVF induction speed control simulation model established by MATLAB/SIMULINK, analyzes the working condition of inverter before and after braking is adopted so as to work out the waveform of capacity and voltage meeting the requirement of braking, and at the meantime solve the characteristic curve of temperature rise of resistance during short-term heating, providing reference for the study on temperature rise trend of resistance and the adoption of relevant cooling measures.