The neutral point-potential and current model predictive control method for Vienna rectifier

J. Mod. Power Syst. Clean Energy

et al. 2018

Self Cite

For a DC distributed power system, system stability can be predicted by dividing it into source and load subsystems, and then applying the Nyquist criterion to the impedance interaction between the source and load model. However, the generalized Nyquist criterion is extremely complicated and cannot directly reveal effective control strategies to reduce interaction problems of cascade threephase AC systems. Specifically, as a current force rectifier, this characteristic makes it difficult to judge the stability of a cascade three-phase Vienna AC system. To deal with the aforementioned problems, a simplified small signal stability criterion is presented for an AC distributed power system. Based on the criterion, the small signal model and impedance based on the reduced order model in the dq domain are studied theoretically. For the instability issue, an impedance regulator design method is presented. The correctness of the simplified stability criterion and the effectiveness of the proposed impedance regulator method are validated by extensive simulation and experiment.

Section: Stability Analysis Of System With Increasing Number Of Cplsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Stability analysis of high power factor Vienna rectifier based on reduced order model in d-q domain

J. Mod. Power Syst. Clean Energy

et al. 2018

Self Cite

“…To effectively solve this problem, an improved finite control set model predictive control (FCS‐MPC) method is proposed to alleviate the problems induced by time delay and neutral‐point balance strategy. Due to the inherent parameter deviations in the practical system, the dynamic performance of the FCS‐MPC was not dramatically superior to the PI arithmetic with SVPWM modulation scheme (PI‐SVM) when the sampling frequency was low.…”

Section: Introductionmentioning

confidence: 99%

“…To effectively solve this problem, an improved finite control set model predictive control (FCS-MPC) method is proposed to alleviate the problems induced by time delay and neutral-point balance strategy. [10] Due to the inherent parameter deviations in the practical system, the dynamic performance of the FCS-MPC was not dramatically superior to the PI arithmetic with SVPWM modulation scheme (PI-SVM) when the sampling frequency was low. In addition to aforementioned traditional control strategies, various nonlinear control methods were also proposed on the control system of VIENNA rectifier, such as model predictive algorithm, [11,12] H∞ robust control, [13] passivity control [14] and so on.…”

Section: Introductionmentioning

confidence: 99%

Discrete sliding mode control strategy for a three‐phase Boost‐type VIENNA rectifier with the CB‐PWM

IEEJ Transactions Elec Engng

2020

A three‐phase three‐level VIENNA rectifier has been widely used in the data center DC power supply and AC/DC hybrid power supply system with the advantages of without dead‐time, low switch voltage stress and small grid‐current harmonic. However, the performance of grid current strongly depends on the controller parameter, and the unreasonable controller parameter may deteriorate the grid current. To effectively improve the static and dynamic performance of grid current, a new kind of carrier‐based pulse width modulation scheme based on the double closed‐loop discrete sliding mode strategy is put forward. Further, a modified exponential reaching law is presented to effectively improve the shaking shock effect caused by the traditional sliding mode surface and the neutral voltage dc wave suppression strategy is then presented. To verify the correctness and effectiveness of the proposed sliding mode control strategy, a complete simulation model and experimental prototype platform under the digital control is established, the detailed theoretical analysis and design method of the proposed control strategy are presented. The simulation and experimental results show that the steady and the transient performance of the grid current with the proposed control strategy are effectively improved, and the neutral voltage in dc side is kept balanced at the same time. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

“…However, significant auxiliary algorithms and low-pass filter design are requested when operating at low switching frequency. Since VIENNA rectifier is a highly constrained system, the rectifier stage voltage not only depends on the switch state, but also is related to the current polarity due to the existence of the front-end diode [4]. These characteristics make the conventional control unavailable to achieve excellent performance in VIENNA rectifier applications.…”

Section: Introductionmentioning

confidence: 99%

Cost function‐based modulation scheme of model predictive control for VIENNA rectifier

et al. 2019

IET Power Electronics

Self Cite

Finite control set model predictive control (FCS-MPC) has been widely used in the control of grid-connected converters with the advantages of fast dynamics, multi-objective control, and easy implement. However, the conventional FCS-MPC bears with variable switching frequency, high current ripple and computational burden. An improved current model predictive with the cost function-based modulation scheme (CFM-MPC) is proposed for a three-phase three-level VIENNA rectifier to improve the power quality. First, the mathematical model and voltage vector are given according to the principle of deadbeat control. Then, the voltage vector of different voltage vectors are selected according to the location of the voltage vector reference, and the switching action time of the selected are directly calculated by the inversely proportional with cost function value of the selected vectors. It remains the merits of both the conventional MPC and space vector pulse width modulation schemes to track the optimum voltage vector without increasing the computational burden. Finally, a comparative study with the proposed CFM-MPC and conventional FCS-MPC has been conducted to verify the superiority of the proposed scheme. The results show the proposed CFM-MPC has the advantages of lower power ripple, fixed switching frequency, lower total harmonic distortion and neutral point potential balance.