中圖分類號： TP273 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.212483 中文引用格式： 饒剛，王國銳. 考慮數(shù)字控制延時的UPS逆變系統(tǒng)控制器設計[J].電子技術應用，2022，48(11)：104-109. 英文引用格式： Rao Gang，Wang Guorui. Digital control time-delays affected controller design of UPS inverter[J]. Application of Electronic Technique，2022，48(11)：104-109.
Digital control time-delays affected controller design of UPS inverter
Rao Gang，Wang Guorui
1.Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering，Wuhan University of Science and Technology， Wuhan 430081，China； 2.Precision Manufacturing Institute，Wuhan University of Science and Technology，Wuhan 430081，China
Abstract： 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.
Key words : digital control；inverter；delay；digital PI；generalized Z transform
0 引言
隨著當今社會進入互聯(lián)網(wǎng)時代，計算機普及，以及信息化產(chǎn)業(yè)迅速發(fā)展，對電力供電設備提出了越來越高的要求[1-3]。不間斷電源(Uninterruptible Power Supply，UPS)作為一種保證計算機服務器、交換機等用電設備安全運行的電源裝置，行業(yè)應用標準越來越高[4-5]。逆變器及其控制系統(tǒng)作為UPS的核心部分，必須具備輸出高質量電壓波形的能力[6]。從技術發(fā)展趨勢來看，要獲得具有優(yōu)越的穩(wěn)態(tài)精度、快速響應以及抗干擾能力的高性能UPS，離不開優(yōu)良的數(shù)字控制技術[7-9]，而逆變控制系統(tǒng)采用數(shù)字控制技術具有的特有問題之一是由采樣、計算、PWM調制等過程產(chǎn)生的延時環(huán)節(jié)對控制系統(tǒng)的穩(wěn)定性能和動態(tài)性能造成的負面影響。文獻[10]、[11]采用數(shù)字控制方法來改進逆變系統(tǒng)的控制性能，但并未考慮數(shù)字延時帶來的影響；文獻[12]考慮了數(shù)字延時帶來的影響，并通過控制方法來消除延時的影響，但是卻增加了系統(tǒng)的復雜性；文獻[13]分析了數(shù)字控制延時產(chǎn)生的原因，但并沒有在考慮延時的情況下對系統(tǒng)控制參數(shù)進行設計。
