考虑数字控制延时的UPS逆变系统控制器设计  

Digital control time-delays affected controller design of UPS inverter

作　　者：饶刚[1] 王国锐 Rao Gang;Wang Guorui(Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Precision Manufacturing Institute,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学机械传动与制造工程湖北省重点实验室,湖北武汉430081 [2]武汉科技大学武汉科技大学精密制造研究院,湖北武汉430081

出　　处：《电子技术应用》2022年第11期104-109,共6页Application of Electronic Technique

基　　金：国家重点研发计划(2017YFF0210701-3)。

摘　　要：为了对不间断电源(UPS)逆变控制系统进行精确设计,分析了数字控制延时对逆变控制系统性能的影响,并提出考虑延时环节的逆变系统控制器设计方法。首先,基于状态空间平均法建立逆变系统的数学模型,分析了控制延时环节对系统稳定性的影响;然后,针对单相220 V/50 Hz的逆变系统将数字化PID双环控制技术应用其中,得到一种参数易于整定的单相UPS逆变控制算法,采用广义Z变换理论来描述数字控制延时环节,改进控制系统的模型,给出了考虑延时环节的数字PID控制器参数的修正设计方法;最后,通过MATLAB/Simulink仿真和实验进行了验证。结果表明,在考虑控制延时下,采用数字PID双环控制的单相UPS逆变控制系统的输出电压稳压精度小于1%,THD(谐波失真)小于2%,负载端突变时系统恢复常态的时间约为1.2 ms,可以有效提升逆变系统输出的稳态性能和动态响应性能。In order to accurately design control system of the uninterruptible power supply(UPS)inverter,impact of the delay induced by digital control on the inverter performances is analyzed,and the design method of the inverter system controller considering the delay link is proposed.The mathematical model of the inverter system is established based on the state space averaging method,and the influence of the control delay link on the system stability is analyzed.Aiming at the single-phase UPS inverter power supply,the digital PID double-loop control technology is applied,and a single-phase UPS inverter control algorithm with easy parameter setting is obtained.The generalized Z-transformation theory is introduced to describe the delay link of digital control,and the model of the control system is improved.The modified design method of the digital PID controller parameters considering the delay link is given.Finally,experimental verification is carried out by MATLAB/Simulink simulation and experiment.The experimental results show that the output voltage regulation accuracy of the UPS inverter control system based on the digital PID is less than 1%,and the THD(total harmonic distortion)is less than 2%.When the load end changes suddenly,the time for the system to return to normal is about 1.2 ms.The steady-state performance and dynamic response performance of the inverter system output are effectively improved.

关 键 词：数字控制 逆变电源 延时 数字PI 广义Z变换 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]