在电压型PWM整流器的控制中，广泛采用在同步旋转坐标系下的直接电流控制方法和双闭环控制结构。
In the control of voltage source PWM rectifier, direct current control and dual close loop control structure ind-q synchronous reference frame are widely adopted.
针对这种情况，提出了一种双闭环控制结构和模糊控制方法，使得负载变化时保持电磁炉的输出功率稳定。
To solve this problem, in this paper we put forward a double closed-loop control configuration and a fuzzy control method to ensure the steady output power when the load changes.
其次采用了两种不同方法对斩波串级调速系统的斩波回路进行了建模和分析，并得到斩波双闭环控制结构图；
Then two different method is given to analyze chopper and mathematics model is based, so double-close-loop control chart is got.
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