聚集经济原理是城市和区域经济理论中的经典思想，聚集经济效应是城市化过程中的基础效应。
Aggregated economy theory is the classical principle of urban and region economy theory while aggregated economy effect is the basic effect during the process of urbanization.
重复控制的基本思想是控制理论中的内模原理，根据上一周期的控制误差消除后面各周期性的信号误差。
The repetitive controller based on the theory of internal model produces correction signal based on the control error of the last cycle to eliminate the error in the latter cycle.
详细分析了电路的工作原理，介绍了控制电路的设计思想，进行了主要参数的理论计算，最后通过仿真验证。
The paper labors the working principle and design thought of control circuit, at last parameters are calculated in theory and simulation is done to confirm the theoretical analysis.
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