船舶全电力推进系统恒功率负载有源阻尼控制策略  

An Active Damping Control of Constant Power Load for All-Electric Ships

作　　者：庄绪州 张勤进[1] 刘彦呈[1] 郭洪智 张博 Zhuang Xuzhou;Zhang Qinjin;Liu Yancheng;Guo Hongzhi;Zhang Bo(Marine Engineering College Dalian Maritime University,Dalian,116026,China)

机构地区：[1]大连海事大学轮机工程学院

出　　处：《电工技术学报》2020年第S01期101-109,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金（51979021,51709028）;中央高校基本科研业务费专项资金（3132019317）;辽宁省重点研发计划（2019JH8/10100045）资助项目

摘　　要：为解决船舶全电力推进系统中恒功率负载引起LC滤波器谐振的问题,提出一种基于输入电压前馈的Buck变换器有源阻尼控制策略。首先利用小信号模型分析恒功率负载的负阻抗特性及其导致LC滤波器谐振的机理,详细推导恒功率负载与LC滤波器级联的稳定约束条件;进而在电流内环引入基于二阶低通滤波器的输入电压前馈环节,使之产生阻尼电流,用于抵消负阻抗特性对LC谐振的影响;详细分析有源阻尼控制的实现形式,并给出阻尼参数的设计方法;最后,通过伯德图和奈奎斯特图对系统稳定性进行论证。实验结果验证了所提控制策略的有效性和可行性。The resonance of LC filter caused by constant power load is an important problem in all-electric ship.An active damping control strategy of Buck converter based on input voltage feedforward is proposed.Firstly,the negative impedance characteristics of constant power load and the mechanism of LC filter resonance are analyzed by small signal model.The stability constraints of cascade between constant power load and LC filter are derived in detail.Then,the input voltage feedforward based on second-order low-pass filter is introduced into the inner current loop.It generates a damped current to counteract the effect of negative impedance on LC resonance.The design method of damping parameters is given.Finally,the Bode and Nyquist diagram of the impedance ratio demonstrate the stability of the system.The experimental results verify the effectiveness and feasibility of the proposed control strategy.

关 键 词：有源阻尼 恒功率负载 负阻抗特性 LC 滤波器谐振 全电力推进系统 

分 类 号：TM46[电气工程—电器]