用于DC-DC变换器的非线性PID控制

由于经典PID控制对被控系统的参数摄动比较敏感，将非线性PID控制方法引入DC—DC变换器，可以使变换器具有很强的的鲁棒性、适应性和稳定性．以Buck—Boost变换器为例，给出了非线性PID控制的仿真模型，针对变换器输入电压波动、负载波动和内部参数摄动对输出电压的影响，分别作了仿真试验和分析．仿真结果表明，将非线性PID控制应用到Buck—Boost变换器中能够使得变换器对外部及其内部参数的摄动有良好适应性、此外，该控制还可以应用到其它类型的DC—DC变换器中。

Nonlinear PID Control Method Applied to DC-DC Converters

Nonlinear PID control method was introduced into DC-DC converters, thus making the converters be of strong robustness, adaptability and stability, and overcoming the sensibility to the parameter variation of controlled systems when the conventional PID control method is used. In this paper, with the Buck-Boost converter as an example, the simulation model with nonlinear PID control was proposed. The effects of the variations of the input voltage, the load resistance and the inner parameters on the output voltage were respectively simulated and analyzed. The simulation results show that the application of nonlinear PID control to the Buck-Boost converter can make the converter more adaptable to the outer and inner parameter variations. Moreover, this control method can also be applied to other types of DC-DC converters.