宽电压范围高速低压发电机交直变换器的平均电流控制策略  

An Average Current Control Strategy of AC-DC Converter for High-speed Low Voltage Generators with Wide Voltage Input

作　　者：台流臣[1] 林明耀[1] 王建华[1] 付兴贺[1] 

机构地区：[1]东南大学伺服控制技术教育部工程研究中心,南京210096

出　　处：《电工技术学报》2015年第13期19-26,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51207023);教育部博士点基金(20120092120051)资助项目

摘　　要：基于双管Buck-Boost变换器,提出一种高速低压发电机交直变换器的平均电流控制策略。高速低压发电机的输出电压宽,低频电压纹波大,难以直接应用于低压直流供电系统,需要对发电机的输出电压进行稳压变换。同极性的双管Buck-Boost变换器适用于宽电压范围输入场合。基于平均开关模型,建立双管Buck-Boost变换器同步工作模式的非理想低频小信号模型,推导关键的传递函数,分析输入参数变化、负载变化以及右半平面零点对控制环路稳定性的影响,提出高稳定性和低输出纹波的宽输入电压平均电流控制策略。通过SABER仿真软件,验证宽电压输入双管Buck-Boost变换器平均电流控制的可行性,设计一台10倍输入电压变化范围的原理样机并进行实验测试,验证了所提出控制策略的可靠性和有效性。A two-switch Buck-Boost （TSBB） converter controlled by the average current mode is proposed for the high-speed low-voltage generator. For the high-speed low-voltage generator, its output voltage range is wide and low-frequency voltage ripple is also large. In order to supply power to low-voltage DC power system, the generator output voltage need to be regulated by the DC converter. The noninverting two switches Buck-Boost converter is suitable for wide input voltage applications. The low-frequency small-signal model of the non-ideal TSBB converter is built in the synchronous operation mode based on the averaged switch method, and the key transfer function of the control system is also derived. The influences of the input parameters, the load changes, and the right half plane （RHP） zero points on the control system are then analyzed. Based on the small-signal models, the average current control strategy with high stability and low output ripple and suitable for wide input voltage is proposed. The feasibility of the proposed average current control strategy is verified by the simulation using SABER software. And a prototype with 10 times input voltage range is built to verify the correctness and effectiveness of the proposed control strategy.

关 键 词：高速发电机 双管Buck-Boost变换器 低频小信号模型 平均电流控制 

分 类 号：TM351[电气工程—电机]