Bi-DC/DC变换器带恒功率负载稳定性分析  

Stability Analysis of Bi-DC/DC Converter with Constant Power Loads

作　　者：杨甲甲[1] 张辉[1,2] 支娜[1] YANG Jiajia;ZHANG Hui;ZHI Na(School of Automation and Information Engineering,Xi’an University of Technology, Xi’an 710048, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China)

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048 [2]西安交通大学电气设备电气绝缘国家重点实验室,西安710049

出　　处：《电源学报》2017年第6期141-146,170,共7页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51307140;51277150);陕西省工业攻关资助项目(2013K07-05);陕西省教育厅产业化培育资助项目(14JF020);电力系统国家重点实验室开放基金资助项目(SKLD16KZ01)~~

摘　　要：针对直流微电网中储能装置接口Bi-DC/DC变换器带恒功率负载时的稳定性问题进行了研究。基于状态空间平均法,建立Bi-DC/DC变换器小信号模型,采用母线电压外环和电感电流内环相结合的双闭环控制策略来抑制直流母线电压的波动并设计控制器参数。利用阻抗比禁止区判据进行稳定性判定,并分析了线路滤波参数、负载功率和母线电容对变换器级联后稳定性的影响,得出规律性结论。仿真结果验证了理论分析及控制方法的有效性。In this paper,the stability of Bi-DC/DC converter with constant power loads(CPL)is studied.Based on the state-space average method,the small-signal model of Bi-DC/DC converter is established.A dual-loop control strategy combining the bus voltage outer loop and the inductance current inner loop is adopted to suppress the fluctuation of the DC bus voltage,and the controller parameters are also designed.According to the impedance ratio forbidden region criterion,the stability is determined.The influence of line filter parameters,load power and DC bus capacitance on the stability of cascaded converter is analyzed,and some regularity conclusions are given.Simulation results verify the correctness of the theoretical analysis and the control method.

关 键 词：Bi-DC/DC变换器 恒功率负载 级联稳定性 

分 类 号：TM71[电气工程—电力系统及自动化]