Midpoint potential compensation balance control method based on virtual space vector pulse‐width modulation for NPC three‐level inverter

2019 ◽  
Vol 29 (9) ◽  
Author(s):  
Bo Fan ◽  
Zhumu Fu ◽  
Jiangtao Fu ◽  
Leipo Liu
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Balance Control ◽  
Virtual Space ◽  
Space Vector ◽  
Midpoint Potential

scholarly journals Modified Modulation Strategy of 1: 1: 2 Asymmetric Nine-Level Inverter and Its Power Balance Method

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 75
Author(s):  
Manyuan Ye ◽  
Qiwen Wei ◽  
Wei Ren ◽  
Guizhi Song
Keyword(s):  
Output Power ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Low Voltage ◽  
Balance Control ◽  
Power Balance ◽  
Switching Loss ◽  
Switching Losses ◽  
Hybrid Frequency

The three unit nine-level inverter can output more voltage levels with fewer h-bridge units, while having better output waveform quality. However, in the conventional hybrid frequency modulation strategy, only one low-voltage unit adopts pulse width modulation (PWM), which causes the problem of switching loss and uneven heat distribution between the two low-voltage units. At the same time, the output power of the conventional modulation strategy is unbalanced. Aiming to resolve the above problems, a modified hybrid modulation strategy and a power balance control method under the strategy is proposed in this paper. The modulation strategy achieves output power balance between the three units and an even distribution of switching losses between the two low voltage units while maintaining the same output power quality. Simulation and experimental results verify the feasibility of the modulation strategy.

scholarly journals Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Nam Xuan Doan ◽  
Nho Van Nguyen
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Low Cost ◽  
Comparative Investigation ◽  
Neutral Point ◽  
Virtual Space ◽  
Vector Diagram ◽  
Space Vector ◽  
Output Performance ◽  
Obvious Benefit

This paper proposes a novel 3-phase asymmetric 3-level T-type NPC inverter and studies its PWM performance using a virtual space vector pulse width modulation control strategy. Firstly, the mathematical model and characteristics of this economical topology are described. Then, a virtual space vector approach is proposed to build a space vector diagram for designing SVPWM control. Similar to the conventional 3-level NPC inverter, the asymmetric inverter can also work with the neutral point voltage self-balancing in a fundamental period, which enables employment of this topology in various applications. Finally, simulation and experiment results under different load conditions have shown good output performance of the asymmetric 3-level topology. Similar tests are also performed on both conventional 2-level and 3-level inverters for comparison. For an almost similar number of different voltage vectors in the space vector diagram, the asymmetric 3-level topology can compete with conventional 3-level inverters for low-cost applications. The obvious benefit of the asymmetric 3-level inverter is a smaller number of switches devices while it can achieve output performance similar to that of the conventional 3-level. The comparative investigation also shows that the total loss given by SVPWM for the asymmetric 3-level configuration is lower than that of the traditional 3-level inverter.

The Research of Improved Scheme for Asynchronous Motor Direct Torque Control

2012 ◽  
Vol 466-467 ◽  
pp. 819-823
Author(s):  
Di Chen ◽  
Rui Juan Hou ◽  
Jie Li ◽  
Jin Niu Tao
Keyword(s):  
Digital Signal Processor ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Asynchronous Motor ◽  
Direct Torque Control ◽  
Digital Signal ◽  
Torque Control ◽  
Space Vector

This paper proposed a kind of new control method for resolving the problem of the Direct Torque Control (DTC)'s greater torque pulsation problem at low speed, this method is based on Space Vector Pulse Width Modulation (SVPWM). SVPWM is a kind of excellent Pulse Width Modulation (PWM) scheme. It can not only improve the inverter DC voltage utilization, reduce harmonic losses, restrain torque pulsation, also easily generate high-precision real-time waveform by the high-speed digital signal processor. The simulation results of this system by Matlab/Simulink indicate that the space vector PWM direct torque control can efficiently reduce the pulse of motor torque and flux linkage.

scholarly journals Research on the Equivalent Virtual Space Vector Modulation Output of Diode Clamped N-level Converter under Multi-Modulation Carrier Modulation

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3803
Author(s):  
Yingjie He ◽  
Chao Lei ◽  
Yunfeng Liu ◽  
Jinjun Liu
Keyword(s):  
Theoretical Analysis ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Virtual Space ◽  
Space Vector ◽  
N Level ◽  
Capacitor Voltage ◽  
Multi Level ◽  
Level Converter ◽  
Relationship Of

Diode-clamped multi-level converters have DC-side capacitors in series, which will lead to the unbalance of DC-side capacitor voltage, the distortion of the output waveform, the increase of total harmonic distortion (THD), and even the damage of switching devices, which will make the system inoperable. The proposal of virtual space vector pulse-width modulation (VSVPWM) realizes the balanced control of the capacitor voltage, but when the output level of converter increases, the implementation of VSVPWM becomes very complicated, and the amount of calculation also increases greatly, thus hindering its application in the multi-level circuit. Compared with VSVPWM, the carrier-based pulse-width modulation (CBPWM) is simple to operate and easy to implement. If the equivalent relationship between CBPWM and VSVPWM can be found, the application of VSVPWM can be generalized to any level, and the advantages of VSVPWM can be fully utilized. This paper aims to study the inner relationship of VSVPWM and the multi-modulation carrier CBPWM (MCBPWM). After strict theoretical analysis, the equivalent relationship of VSVPWM and MCBPWM in the three-level and four-level and converter is realized by injecting the zero-sequence component into the modulation waves. Furthermore, the equivalent relationship between VSVPWM and MCBPWM is deduced to the N-level converter. Finally, the correctness of the relevant theoretical analysis is verified by the experiment.

scholarly journals Application of space vector pulse width modulation algorithm based on programmable logic array in power system

2021 ◽  
Vol 2108 (1) ◽  
pp. 012003
Author(s):  
Zhihai Cheng ◽  
Hui Liu
Keyword(s):  
Motor Control ◽  
Power System ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Method ◽  
High Reliability ◽  
Voltage Regulation ◽  
Space Vector ◽  
Theoretical Support ◽  
Induced Draft Fan

Abstract In the traditional power system, the voltage regulation and frequency modulation control method used for boiler induced draft fan is limited in control accuracy. With the improvement of furnace pressure change accuracy, higher requirements are put forward for motor control algorithm. This paper studies permanent magnet synchronous motor (PMSM) as the executive part of induced draft fan servo control system, and adopts FOC control method based on space vector pulse width modulation (SVPWM). Firstly, the simulation model of SVPWM pulse width modulation algorithm is established by MATLAB to provide theoretical support for the subsequent debugging algorithm; When using FPGA to realize SVPWM modulation algorithm, FPGA has the advantages of high reliability and high real-time processing, which provides theoretical support and application guidance for the realization of high-precision motor control of boiler induced draft fan in power system.

A Simplified Space Vector Pulse Width Modulation Method Including Over Modulation Operation for Five Level Cascaded H-bridge Inverter with FPGA Implementation

2017 ◽  
Vol 8 (3) ◽  
pp. 1203
Author(s):  
Bogimi Sirisha ◽  
P. Satish Kumar
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Transfer Characteristic ◽  
Modulation Method ◽  
Optimal Switching ◽  
Space Vector ◽  
Digital Implementation ◽  
Modulation Region ◽  
Simulation Results

This<strong> </strong>paper presents simplified control strategy of Space Vector Pulse Width Modulation method  including over modulation region  with linear transfer characteristic for cascaded H-bridge inverters. Because of large number of switching states of the cascaded H- Bridge inverter, the over modulation operation is very complex. And also requires incorporation of  both under modulation and over modulation algorithms. The proposed control method is effective in terms of selecting the optimal switching states with reduced computational complexity using simplified linear calculations which makes it easier for digital implementation. The performance of the proposed method  is simulated and tested experimentally through Spartan 3A FPGA processor for five level Cascaded H-bridge Inverter. The simulation results and harmonic analysis of voltage and current at various modulation indexes as are presented which are in well agreement.

Sign in / Sign up

Export Citation Format

Share Document