中圖分類號(hào)： TP273 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.212483 中文引用格式： 饒剛，王國(guó)銳. 考慮數(shù)字控制延時(shí)的UPS逆變系統(tǒng)控制器設(shè)計(jì)[J].電子技術(shù)應(yīng)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(dāng)今社會(huì)進(jìn)入互聯(lián)網(wǎng)時(shí)代，計(jì)算機(jī)普及，以及信息化產(chǎn)業(yè)迅速發(fā)展，對(duì)電力供電設(shè)備提出了越來(lái)越高的要求[1-3]。不間斷電源(Uninterruptible Power Supply，UPS)作為一種保證計(jì)算機(jī)服務(wù)器、交換機(jī)等用電設(shè)備安全運(yùn)行的電源裝置，行業(yè)應(yīng)用標(biāo)準(zhǔn)越來(lái)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(zhì)量電壓波形的能力[6]。從技術(shù)發(fā)展趨勢(shì)來(lái)看，要獲得具有優(yōu)越的穩(wěn)態(tài)精度、快速響應(yīng)以及抗干擾能力的高性能UPS，離不開(kāi)優(yōu)良的數(shù)字控制技術(shù)[7-9]，而逆變控制系統(tǒng)采用數(shù)字控制技術(shù)具有的特有問(wèn)題之一是由采樣、計(jì)算、PWM調(diào)制等過(guò)程產(chǎn)生的延時(shí)環(huán)節(jié)對(duì)控制系統(tǒng)的穩(wěn)定性能和動(dòng)態(tài)性能造成的負(fù)面影響。文獻(xiàn)[10]、[11]采用數(shù)字控制方法來(lái)改進(jìn)逆變系統(tǒng)的控制性能，但并未考慮數(shù)字延時(shí)帶來(lái)的影響；文獻(xiàn)[12]考慮了數(shù)字延時(shí)帶來(lái)的影響，并通過(guò)控制方法來(lái)消除延時(shí)的影響，但是卻增加了系統(tǒng)的復(fù)雜性；文獻(xiàn)[13]分析了數(shù)字控制延時(shí)產(chǎn)生的原因，但并沒(méi)有在考慮延時(shí)的情況下對(duì)系統(tǒng)控制參數(shù)進(jìn)行設(shè)計(jì)。
