基于PLC的级联型高压变频器转差率控制技术  

Cascade High Voltage Inverter Slip Control Technology Based on PLC

作　　者：孙式运[1] SUN Shiyun(Intelligent Engineering Department,Bozhou Vocational and Technical College,Bozhou 236800,Anhui Province)

机构地区：[1]亳州职业技术学院智能工程系,安徽亳州236800

出　　处：《沈阳工程学院学报（自然科学版）》2024年第4期43-48,60,共7页Journal of Shenyang Institute of Engineering:Natural Science

基　　金：安徽省教育厅自然科学重点研究项目(2022AH052582);安徽省教育厅质量工程项目(2022zygzsj038);亳州职业技术学院内涵建设项目(2023bzjyxmzd03);安徽省高校自然科学研究项目(2023AH053212)。

摘　　要：单一考虑输出功率而忽略级联型高压变频器电容储能的影响,易造成控制结果转差率较高,导致瞬时功率变化引发系统不稳定。因此,同时考虑上述参数,提出基于PLC的级联型高压变频器转差率控制技术。分析级联型高压变频器中压敏电阻的标称电压特性,明确输出功率对变频器运行参数的影响。在此基础上修正各项损耗误差,以此解析变频器的实际电容储能参数。基于PLC设计变频器控制单元的程序逻辑,得到相应的控制信号,经变频器转换解析后调制其矢量空间,实现变频器转差率控制。由实验可知:所提方法转差率较低,能保证输出电压稳定,满足了级联型高压变频器的实际应用需求。Focusing solely on output power and ignoring the impact of capacitor energy storage in cascaded high-voltage inverters can easily result in high control result slip,leading to system instability caused by instantaneous power changes.Therefore,considering the above parameters,a cascaded high-voltage inverter slip control technology based on PLC is proposed.By analyzing the nominal voltage characteristics of varistors in cascaded high-voltage frequency converters,the influence of output power on the operating parameters of the frequency converter is clarified.On this basis,various loss errors are corrected to analyze the actual capacitance energy storage parameters of the frequency converter.The program logic of the inverter control unit is designed based on PLC,and the corresponding control signals are obtained.After the inverter conversion and analysis,the vector space is modulated to realize the slip control of the inverter.From the experiment,it can be seen that the proposed method has a low slip rate and can ensure stable output voltage,meeting the practical application requirements of cascaded high-voltage inverters.

关 键 词：级联型高压变频器 转差率控制技术 输出功率 电容储能 PLC 

分 类 号：TM921[电气工程—电力电子与电力传动]