After the module includes and the initial variable declarations, the main control loop is entered.
在模块include语句和初始变量声明之后，进入主控制循环。
The SPLL consists of calculation frequency error, updating loop middle variable, and output control signal.
该锁相环由计算频率误差、更新环路中间变量、输出控制信号组成。
By adjustment to control signal, systems might realize variable voltage, variable frequency, steady voltage, steady frequency closed loop control.
通过对控制信号的调整，系统可实现变压、变频、稳压、稳频的闭环控制。
The current closed-loop system is composed of current controllers that control variable parameter PI.
并通过变参数PI数字电流控制器构成电流闭环系统。
This PFC was realized by employing sliding-mode variable-structure inner current loop control and outer voltage loop PI control with digital low-pass filter to achieve high performance.
提出了采用滑模变结构电流内环与由PI调节器和数字低通滤波器组成的电压外环相结合的控制系统，以实现高性能高速度的功率因数校正。
The outer loop of the cascade controller adopts conventional PI control algorithm and takes the capacitor voltage as the controlled variable;
控制器的外环采用PI控制算法，以电容电压为被控量；
By introducing integral variable structure and high gain observer, the closed-loop control systems is shown to be globally stable in terms of Lyapunov theory, with tracking error converging to zero.
通过引入积分型变结构切换函数及高增益误差观测器，基于李雅普·诺夫稳定性理论，证明了闭环系统是全局稳定的，输出跟踪误差都收敛到零。
To alleviate the problem of variable switching frequency, a novel quasi DPC control strategy with current loop was represented through the analysis of PWM rectifier instantaneous power.
可变开关频率为缓解这个问题，一种新型的准DPC控制策略与电流回路通过PWM整流器瞬时功率的分析表示。
The software comes true the double closed loop regulator, therein the velocity loop is the variable-structure control, and the current loop is the classical PI control.
软件实现了调速系统的双闭环调节，其中速度环采用滑模变结构控制，电流环则是经典的PI控制。试验结果说明该调整系统有较好的动态和静态性能。
For the inverted pendulum system with multi-variable and nonlinear characteristic, a double closed-loop cascade fuzzy control approach was put forward based on Takagi-Sugeno fuzzy model.
在对火电厂过热汽温控制对象特点分析基础上，保留串级控制抗内扰的性能，结合模糊控制动态特性好的特点，提出了一种复合模糊串级控制设计。
For the inverted pendulum system with multi-variable and nonlinear characteristic, a double closed-loop cascade fuzzy control approach was put forward based on Takagi-Sugeno fuzzy model.
在对火电厂过热汽温控制对象特点分析基础上，保留串级控制抗内扰的性能，结合模糊控制动态特性好的特点，提出了一种复合模糊串级控制设计。
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