基于小电流检测的交-交实时连续变频的研究

Research on real-time continuous frequency control of AC-AC converter based on low current detection

为实现交-交变频器的实时连续变频,在深入研究了交-交变频原理、余弦交点法近似算法原理和双变量控制原理的基础上,提出了通过小电流检测来实现交-交实时连续变频的控制策略。该策略通过小电流检测来判断换流片段和换流时刻,依据余弦交点法近似算法在线计算触发时刻。为验证该控制策略的可行性,搭建了以STM32F103ZET为主控芯片的小电流检测交-交变频调速系统实验平台,并结合双变量原理、余弦交点法近似算法和小电流检测换流策略编写程序,进行实验。实验结果表明该策略有较好的控制效果。

In order to realize real-time continuous variable frequency of AC-AC converter ,further studied the principle of AC-AC frequency conversion ,approximation of cosine wave crossing and the principle of double variable ,then proposed the strategy research on real-time continuous frequency control of AC-AC converter based on low current detection .This strategy used low current detection to judge current commutation segment and moment ,calculated trigger point at point online based on approximation of cosine wave crossing .To verify the feasibility of this control strategy ,set up the AC-AC converter speed control system experimental platform based on stm32f103zet ,and wrote the program based on the principle of double variable ,approximation of cosine wave crossing and the strategy of low current detection .Experimental results showed that the strategy has better control performance .