双变量交-交变频调压过程触发控制策略研究

Study on Trigger Control Strategy of Double-Variable Ac-Ac Frequency-Conversion and Voltage-Regulation

介绍了双变量原理,将调压与变频相结合,利用有级变频实现全范围无级调速的方法,建立了基于MATLAB的双变量交-交变频调速系统仿真模型。在分析对比传统触发控制方式的基础上,提出了一种方便实现闭环控制,同时保证输出电压对称度和正弦度都很好的控制方式-改进的方波法。结果表明:采用改进的方波法变频调压,减少了输出波形的谐波成分,改善了变频器的性能。

Introduces the double-variable control principle and a method to realize stepless speed control with the combintion of variable-frequency and voltage regulation. Sets up the simulation model of double-variable Ac-Ac frequency converter based on MATLAB. Presents a new control method （improved square-wave law） that achieves closed-loop control easily and ensures the output voltage with a good symmetry and sine. The conclusion indicates that the method using the improved square-wave law for variable-frequency and voltage regulation reduces the output waveform＇s harmonic components and improves frequency converter＇s performance.