The Analysis on Digital Delay and the Research on Compensation Strategy of Predictive Direct Power Control

doi:10.11985/2016.11.001

Abstract

Abstract:

The delay factors such as A–D conversion, ZOH (zero order hold) and PWM update caused by digital control employed in the power electronic converter, will affect the system performance, which will cause the system oscillation and even unstable for the serious cases. With the PWM rectifier as the applied object, this paper studies the influence of each delay factor on the control performance when predictive deadbeat direct power control based on SVM is adopted, and proposes the corresponding compensation strategy. The research shows that there are three main delay factors influencing the control performance, including grid voltage delay, grid current delay and PWM output voltage delay. A compensation method adopting the predictive voltage and current value of the next time for the control system is proposed through detailed analysis and derivation of the delay reasons of the grid voltage and grid current. For the PWM output delay, the impact of ZOH and PWM update mechanism on the amplitude and phase of the output voltage are analyzed and deduced,and the analytic compensation formula is finally obtained. Three kinds of delay factors and the corresponding compensation strategies to reduce the power pulsation, to suppress the current harmonic and to eliminate the steady-state error are analyzed particularly through simulations and experiments and the results correspond to the correctness and effectiveness of the proposed compensation strategy.

Key words: PWM rectifier, predictive control, deadbeat control, direct power control, delay compensation

CLC Number:

TM464

Zhang Yongchang,Gao Jihao. The Analysis on Digital Delay and the Research on Compensation Strategy of Predictive Direct Power Control[J]. Journal of Electrical Engineering, 2016, 11(11): 1-8.

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	SVM-DPC1	SVM-DPC2	SVM-DPC3	SVM-DPC4
THD(%)	9.87	7.16	6.73	6.57
P_ripple/W	97.5	75.46	72.09	70.5
Q_mean/var	-15.38	-13.53	-10.27	1.1