基于滿意優(yōu)化的三電平PWM整流器瞬時開關頻率抑制方法
發(fā)布時間：2018-09-08 07:01
【摘要】：提出一種新型的基于滿意優(yōu)化的三電平脈沖寬度調制(pulse width modulation,PWM)整流器有限控制集模型預測控制(finite control set model predictive control,FCS-MPC)方法,將滿意優(yōu)化思想引入模型預測控制的在線規(guī)劃中,代替?zhèn)鹘y(tǒng)方法中的權值函數,避免了復雜的加權系數整定過程。然而受到電力電子系統(tǒng)結構的限制,三電平PWM整流器僅可輸出27種可行電壓矢量,過多的控制約束被引入后,極易造成系統(tǒng)優(yōu)化無解。該文采用幾何分析法揭示了優(yōu)化無解現象的產生原理,并論證了其與瞬時開關頻率過高問題之間的內在聯系。通過約束松弛的方式弱化滿意和失控的界限,使低優(yōu)先級指標可以參與在線規(guī)劃。仿真和實驗結果表明,該方法在保證系統(tǒng)功率、中點電位等多項指標達到期望滿意度的前提下,最大限度的降低了開關動作頻率,避免了高采樣頻率造成器件局部過熱損壞。與經典矢量控制的對比結果可知,在較低的開關頻率下(fs≈300 Hz)所提方法可獲得更優(yōu)異的動、穩(wěn)態(tài)性能。
[Abstract]:A new method of finite control set predictive control (finite control set model predictive control,FCS-MPC) for three-level pulse width modulation (pulse width modulation,PWM) rectifier based on satisfactory optimization is proposed. The idea of satisfactory optimization is introduced into the on-line planning of model predictive control. Instead of the weight function in the traditional method, the complex weighting coefficient tuning process is avoided. However, due to the limitation of the power electronic system structure, the three-level PWM rectifier can only output 27 feasible voltage vectors. When too many control constraints are introduced, it is easy to cause the system optimization without solution. In this paper, the geometric analysis method is used to reveal the principle of the problem of optimization without solution, and the internal relationship between the problem and the problem of excessive instantaneous switching frequency is demonstrated. The limits of satisfaction and runaway are weakened in the way of constraint relaxation, so that the low priority index can participate in online planning. The simulation and experimental results show that the method can reduce the switching frequency and avoid the local overheating damage caused by high sampling frequency on the premise that the system power and midpoint potential can reach the desired satisfaction. Compared with classical vector control, the proposed method can obtain better dynamic and steady performance at lower switching frequency (fs 鈮，
本文編號：2229724
[Abstract]:A new method of finite control set predictive control (finite control set model predictive control,FCS-MPC) for three-level pulse width modulation (pulse width modulation,PWM) rectifier based on satisfactory optimization is proposed. The idea of satisfactory optimization is introduced into the on-line planning of model predictive control. Instead of the weight function in the traditional method, the complex weighting coefficient tuning process is avoided. However, due to the limitation of the power electronic system structure, the three-level PWM rectifier can only output 27 feasible voltage vectors. When too many control constraints are introduced, it is easy to cause the system optimization without solution. In this paper, the geometric analysis method is used to reveal the principle of the problem of optimization without solution, and the internal relationship between the problem and the problem of excessive instantaneous switching frequency is demonstrated. The limits of satisfaction and runaway are weakened in the way of constraint relaxation, so that the low priority index can participate in online planning. The simulation and experimental results show that the method can reduce the switching frequency and avoid the local overheating damage caused by high sampling frequency on the premise that the system power and midpoint potential can reach the desired satisfaction. Compared with classical vector control, the proposed method can obtain better dynamic and steady performance at lower switching frequency (fs 鈮，
本文編號：2229724
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