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可控电感在WPT系统动态性能的优化方法OA北大核心CSTPCD

Dynamic performance optimization method of WPT system based on controllable inductor

中文摘要英文摘要

SS型Buck-WPT(Buck-wireless power transfer)系统由Buck电路和基本的SS型无线电能传输电路组成.该电路系统因为结构和控制方式简单、控制效果明显等优点在感应式无线电能传输方面得到广泛应用.但该电路的动态特性并不能满足一些时变系统对快速性的较高要求.例如,系统在启动时会存在较强震荡和较大超调,系统负载改变时稳定状态会发生改变且存在明显抖动,系统极限空载时原边谐振电流会增大,且该电流值远超出安全工作范围.本文提出了一种基于可控电感的SS型Buck-WPT系统.首先,分析了电感值可调的方法并在COMSOL中建立仿真模型验证其电感值可控的特性.其次,对SS型Buck-WPT系统进行数学建模,将SS型WPT系统作为Buck电路的特殊负载,推导SS型Buck-WPT系统状态空间方程.研究其三维空间内相轨迹的降维描述方法,将该系统用二维相轨迹描述系统运行过程.然后,通过分析启动阶段相轨迹运行规律,改进前级Buck电路.将传统Buck电路中的电感换成可控电感,运用其电感值可调的控制系统开通阶段的运行轨迹,使系统在1个开关周期内无超调快速进入稳态.当系统负载改变时,系统的输出电压会改变,且是不断抖动来回反复的过程,利用PI算法对系统进行恒流控制.通过可控电感控制系统相轨迹,使副边输出能无抖动快速进入稳态,保证输出电压不变.针对SS型谐振网络的Buck-WPT系统中出现空载大电流的问题,提出了将可控电感串联接入原边谐振网络的方法.实时检测原边谐振电流值,该值超过正常工作范围,感值就快速增大,减小原边谐振电流,达到空载时维持原边谐振电流安全值以下.最后,验证上述方法在优化SS型Buck-WPT系统动态特性的有效性,在Simulink中搭建仿真电路.该方法能减小工作条件改变时带来的系统抖动,且在不改变系统响应速度前提下减小超调,优化系统动态性能,增强系统抗负载扰动力,提高系统带负载能力有明显效果.

The SS Buck-WPT system,comprised of a buck converter and a basic SS-type wireless power transfer circuit,has gained widespread adoption in inductive wireless power transmission due to its structural superiority,control methods,and effectiveness. However,this system fails to meet the responsiveness requirements of time-varying systems due to its poor dynamic characteristics. In practical applications,it exhibits significant overshoot and oscillation during startup,instability when subjected to varying load resistances,and sharp fluctuations in primary resonance current under light conditions. To address those dynamic challenges,this paper proposes a SS-type Buck-WPT system based on controllable inductance. Firstly,controllable inductance was thoroughly analyzed to understand the principle of adjustable inductance,and then modeled in COMSOL to verify the findings. Mathematical modeling analysis of the SS Buck-WPT system was conducted,with the system state space equation derived by considering the SS WPT system as the load of the buck converter. The system was described using two-dimensional phase trajectories to simplify the analysis. A phase trajectory operation law during start-up was proposed,and the pre-buck circuit was improved by replacing the conventional inductor with a controllable one,allowing for stable operation with minimal overshoot during startup. The PI algorithm was used to maintain constant current despite load changes,ensuring expected phase trajectory behavior and rapid return to steady-state operation with real-time control of inductance. Excessive primary resonant current was mitigated by cascading the controlled inductance with the SS in the primary circuit,adjusting the inductance automatically to keep current within permissible values. To validate the proposed method,a prototype was implemented in Simulink. Results show that this strategy significantly improves system dynamic performance and tolerance to varying loads compared to traditional methods.

凌荣光;何磊杰;刘巧;孟繁超;叶佳青;唐春森

国网浙江省电力有限公司宁波供电公司,浙江省宁波市 315000重庆大学自动化学院,重庆 400044

动力与电气工程

无线电能传输动态性能优化可控电感相轨迹规划

wireless power transferdynamic performance optimizationcontrollable inductorphase trajectory planning

《重庆大学学报》 2024 (006)

103-117 / 15

国网浙江省电力有限公司科技项目(B311NB210005).Supported by State Grid Zhejiang Electric Power Co.,Ltd.Technology Project(B311NB210005).

10.11835/j.issn.1000.582X.2024.06.011

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