Conference Paper

Direct power control for Neutral-point-clamped three-level PWM rectifier

Coll. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
DOI: 10.1109/ICIT.2008.4608487 Conference: Industrial Technology, 2008. ICIT 2008. IEEE International Conference on
Source: IEEE Xplore

ABSTRACT This paper proposes a direct power control (DPC) strategy employed for the neutral-point-clamped (NPC) three-level PWM rectifier. Mathematic model of NPC three-level rectifier is conducted firstly as a theoretical base. This topology generates a higher number of output voltage levels, increasing the flexibility for selecting an appropriate voltage vector. The direct instantaneous power control technique for the converter, which has been developed to control the instantaneous active and reactive power directly by selecting the optimum switching state of the converter, is discussed in detail in the paper. The neutral-point potential is controlled according to the direction of the mid-point current and a study of each switching vectorpsilas influence to active and reactive power. Theoretical analysis is presented and the performance of the proposed method is verified by simulation and experiment.

0 Followers
 · 
150 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: PWM rectifier controlled by direct power control (DPC) is characterized by the merits of quick response, no need of inner current tuning and strong robustness, etc. The switching table is the key point of DPC and many researches have been done in this field. However, most papers fail to give a clear interpretation on the mechanism of switching table. This paper gives a detailed analysis on the mechanism of the switching table by using mathematical derivation and geometry illustration. It is found that there are six kinds of feasible switching tables, among which three tables have been reported in the literature while other three not. The performance of the six kinds of tables are compared and their respective pros and cons are summarized. Selected simulation and laboratory experimental results are presented to confirm the feasibility of the six switching tables.
    Electrical Machines and Systems (ICEMS), 2013 International Conference on; 01/2013
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, on the basis of the mathematic model of the three-level PWM rectifier, a power feedforward based control strategy is proposed combining with direct power control with space vector modulation (DPC-SVM) control principle. Feedforward control can reduce or even eliminate the impact on the system causing by load disturbance to improve dynamic performance. The simulation results show that the control method makes the system response speed faster and the dynamic performance better, it largely improved the system rectifier capacity against load disturbances.
    11/2011; 383-390:6942-6947. DOI:10.4028/www.scientific.net/AMR.383-390.6942
  • [Show abstract] [Hide abstract]
    ABSTRACT: The principle of single phase three-level PWM rectifier is discussed. Based on the definition of αβ variable, a mathematic model of the adopted rectifier on the dq reference frame is set up. Based on linear decoupled theory, a decoupled current control strategy is proposed which declines significantly complexity of the control system and has good control characteristics. Computer simulation and experiment results demonstrate that this rectifier under decoupled current control has higher power factor and better dynamic performance, which confirms the effectiveness of the improved control strategy.
    2013 2nd International Symposium on Instrumentation & Measurement, Sensor Network and Automation (IMSNA); 12/2013