混合动力系统稳定性研究
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摘要
采用Buck/Boost电路作为双向DC/DC变换器的基本拓扑,基于平均变量法建立双向DC/DC变换器的等效模型,求解推导双闭环控制策略下DC/DC变换器的闭环阻抗。绘出列车正常运行时在不同速度下的闭环阻抗波特图及阻抗比奈奎斯特曲线图,根据级联系统的阻抗稳定性判据,分析各速度下系统稳定性,并搭建仿真模型进行验证。分析了Boost电路中电感、电容参数值对系统稳定性的影响,以此为依据提出引入虚拟电容提高系统稳定性的改进方案,并根据稳定性判据及仿真结果验证了改进方案的有效性。
The Buck/Boost circuit is the basic topology of the bidirectional DC/DC converter. Based on average variable method,the equivalent model of the bidirectional DC/DC converter is set up and the closed-loop impedance of the DC/DC converter of the double closed-loop control system is derived. The closed-loop impedance Bode diagram and the impedance ratio Nyquist curve at different speeds are plotted. According to the impedance stability criterion of the cascade system,the stability of the system at different speeds is analyzed and simulated. The influence of the inductance and capacitance value on the stability of the system is studied. Based on those all above,a scheme is proposed to improve the stability of the system by introducing the virtual capacitor and the feasibility of the scheme is verified according to the stability criterion and simulation.
The Buck/Boost circuit is the basic topology of the bidirectional DC/DC converter. Based on average variable method,the equivalent model of the bidirectional DC/DC converter is set up and the closed-loop impedance of the DC/DC converter of the double closed-loop control system is derived. The closed-loop impedance Bode diagram and the impedance ratio Nyquist curve at different speeds are plotted. According to the impedance stability criterion of the cascade system,the stability of the system at different speeds is analyzed and simulated. The influence of the inductance and capacitance value on the stability of the system is studied. Based on those all above,a scheme is proposed to improve the stability of the system by introducing the virtual capacitor and the feasibility of the scheme is verified according to the stability criterion and simulation.
引文
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[16]王银银.不对称半桥零电压零电流PWM变换器的研究[D].沈阳:东北大学,2014.
[2]刘树峰.宽输入范围DC/DC变换器及其效率提升方法研究[D].哈尔滨:哈尔滨工业大学,2017.
[3] Juergen Wittmann,Tobias Funk,Thoralf Rosah.A12-48 V wide-vin 9-15 MHz soft-switchingcontrolled resonant DCDC converter.[J] ESSCIRC2017-43rd IEEE European Solid State CircuitsConference,2017,43(11):349-351.
[4]刘佳. DC-DC变换器建模与数字化控制[D].杭州:浙江大学,2016.
[5]夏兴国,陈乐柱,潘小波,等.基于小信号模型的新型Buck变换器补偿网络设计[J].重庆工商大学学报:自然科学版,2016,33(1):52-58.
[6]罗咏.双向DC/DC变换器及电池能量管理系统研究[D].武汉:华中科技大学,2013.
[7]梁逊. DC/DC变换器控制的仿真研究与设计[D].青岛:青岛科技大学,2016.
[8]贾鹏宇.高性能直流变换器系统稳定性问题研究[D].北京:北京交通大学,2014.
[9]薛云涛. ISOP逆变器组合系统的分布式控制及其冗余设计[D].哈尔滨:哈尔滨工业大学,2017.
[10]余辉.三相交流级联系统稳定性判据及解决方案研究[D].武汉:华中科技大学,2016.
[11]尚佳宁.直流开关变换器的精确建模和稳定性分析方法研究[D].北京:北京交通大学,2016.
[12]刘洋.电力电子变换器互联的直流母线稳定控制技术研究[D].哈尔滨:哈尔滨工程大学,2014.
[13]佀东方. DC-DC变换器的级联稳定性分析与改善[D].哈尔滨:哈尔滨工业大学,2014.
[14]周奕龙. DC/DC变换器级联系统稳定性研究[D].哈尔滨:哈尔滨工业大学,2014.
[15]刘明昊.交流传动系统直流侧电压稳定控制策略研究[D].哈尔滨:哈尔滨工程大学,2016.
[16]王银银.不对称半桥零电压零电流PWM变换器的研究[D].沈阳:东北大学,2014.