感应加热过程调频锁相-移相调功复合控制  

Compound Control Scheme of Phase-lock by Frequency Adjustment and Power Regulation by Phase-shift for Induction Heating Process

作　　者：于占东[1] 王千旗 陈勇 付莹[1] YU Zhandong;WANG Qianqi;CHEN Yong;FU Ying(College of Control Science and Engineering,Bohai University,Jinzhou 121013,China)

机构地区：[1]渤海大学控制科学与工程学院,辽宁锦州121013

出　　处：《计算机测量与控制》2023年第8期148-153,175,共7页Computer Measurement &Control

基　　金：国家自然科学基金面上项目(61673071);辽宁省教育厅科学技术研究重点攻关项目(LZ2019001);2020年度辽宁省高等学校创新人才项目。

摘　　要：串联谐振感应加热过程包括调频锁相和移相调功两个控制环节,二者具有较强的非线性和耦合性;在分析逆变频率、输出功率同锁相角、移相角关系的基础上,提出了基于频率分离原理的调频锁相-移相调功复合控制方案,将锁相-调功过程分解为快-慢子系统,并对两个过程分别设计了具有鲁棒稳定性的锁相控制器和移相控制器,解决了感应加热电源的调频锁相-移相调功环节的协调控制问题;将调频锁相-移相调功复合控制方案应用于额定功率20 kW,输出电流40 A的超音频串联谐振感应电源中,验证了该控制方案在确保逆变过程开关器件安全可靠的同时,提高了功率输出的效率;在保证了调功灵活性的同时,又实现了电源的阻抗自匹配。Series resonant induction heating process includes two control links of phase-lock loop by frequency adjustment and power regulation function by phase-shift,both of them have strong nonlinearity and coupling.After analyzing the relationships between inverter frequency,output power,phase-lock angle and phase-shift angle,a phase-lock and phase-shift compound control scheme for power regulation process is proposed based on frequency domain separation principle.The phase-lock and power regulation process is decomposed into the fast-slow subsystems,and the phase-lock controller and phase-shift controller with robust stability are designed respectively.The coordination control problem between phase-lock control by frequency adjustment and power regulation by phase-shift for induction heating power is solved.The compound control scheme is applied to the supersonic frequency series resonant induction power supply with rated power of 20kW and output current of 40A.It is indicated that the safety of power switch devices is ensured in the inverter process,and the efficiency of power output is improved.The control scheme not only ensures the flexibility of power regulation at the same time,but also realizes the impedance self-matching of power supply.

关 键 词：感应加热 调频锁相 移相调功 频率分离 鲁棒稳定性 

分 类 号：TP273.3[自动化与计算机技术—检测技术与自动化装置]