双Buck逆变器的建模与优化设计

Modeling and Optimization Design of Dual-Buck Inverter

对双Buck逆变器进行小信号分析和建模,研究了一种引入谐振控制器的瞬时电压电流反馈双环调节方式。电流内环采用滞环控制,具有易于实现、无条件稳定和响应速度快等优点;电压外环保证了输出电压具有较好的正弦度和稳态特性。此外,谐振控制器的引入也使系统输出外特性显著提高,与传统的采用电流前馈环提高负载抗扰动能力的方法相比,在不增加控制环的基础上,提高了系统的稳态性能,节约了逆变器成本。仿真和实验验证了该控制方案的可行性,系统取得了较好的输出波形质量,较快的动态响应,精确的稳压精度和较高的效率。

In this paper,the small signal model for dual-Buck inverter as well as its control scheme is developed,and a regulation of voltage and current feedback loop with resonant controller is researched.The current inner loop is controlled by hysteresis,which has the characters of simple implementation,a rapid dynamic response and unconditional stability.Voltage outer loop ensures sinusoidal output voltage with good reliability and steady-state properties.In addition,the introduction of resonant controller makes the system output external characteristics significantly improved.Compared with the traditional method of using current feed-forward loop to improve the load disturbance rejection capabilities,this new method improves the steady-state performance and saves the cost without the additional control loop.Simulation and experimental results verify the correctness of the theoretical analysis.The system achieves a better output waveform quality,fast dynamic response,precise regulation accuracy,and high efficiency.