摘要
针对带恒功率负载(CPL)的无线电能传输(WPT)系统由于负阻抗导致系统不稳定的问题,提出了一种新的非线性反馈控制方法,即环路补偿技术,利用反馈环路抵消CPL引入系统的负阻抗,并采用移相闭环控制策略稳定系统输出电流。与不经补偿的比例积分微分(PID)控制策略相比,该方法通过设置合适的补偿量使闭环系统右半平面极点移到左半平面,理论上可以达到无限大稳定区域。搭建系统平台进行了仿真和实验验证,结果表明所提出的环路补偿法增强了系统稳定性,验证了理论分析的正确性。
Aiming at the unstable problem of wireless power transmission(WPT)system with constant power load(CPL)caused by negative impedance characteristics,a new non-linear feedback control method,loop cancellation technology is proposed.The feedback loop is used to cancel the negative impedance brought by the CPL into the system,and the phase-shifted closed-loop control strategy is used to stabilize the output current of the system.Compared with proportion integral differential(PID)control strategy without compensation,the pole of the right half plane of the closed-loop system can be moved to the left half plane by setting appropriate compensation.In theory,the infinite stability region can be achieved.The simulation and experimental results show that the proposed loop compensation method enhances the stability of the system and verifies the correctness of the theoretical analysis.
作者
邢思
陆益民
XING Si;LU Yi-min(Guangxi University,Nanning 530004,China)
出处
《电力电子技术》
CSCD
北大核心
2020年第10期125-128,共4页
Power Electronics
基金
国家自然科学基金(51667005)
广西自然科学基金重点项目(2018GXNSFDA281037)。
关键词
无线电能传输
恒功率负载
环路补偿
wireless power transmission
constant power load
loop cancellation
