scholarly journals Improved Neutral-Point Voltage-Shifting Strategy for Power Balancing in Cascaded NPC/H-Bridge Inverter

Electronics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 167 ◽  
Author(s):  
Jin-Wook Kang ◽  
Seung-Wook Hyun ◽  
Jae-Ok Ha ◽  
Chung-Yuen Won
Keyword(s):  
Phase Equilibrium ◽  
Fault Tolerance ◽  
Output Power ◽  
Control Method ◽  
Neutral Point ◽  
Voltage Range ◽  
Multilevel Inverters ◽  
Three Phase ◽  
Power Balancing ◽  
Tolerance Control

This paper investigates the fault-tolerance control of a multilevel cascaded NPC/H-bridge (CNHB) inverter. The fault-tolerance control method has been widely used for multilevel inverters, such as the neutral-point voltage-shifting control, which can operate for a certain period of time by compensating for the phase voltage of a faulty stack even if one stack is broken. Even though the three-phase equilibrium is maintained in the case of failure by using the conventional neutral-point voltage-shifting control, an imbalance in the output power occurs between each stack, which causes problems for maintenance and lifetime. Therefore, this paper proposes a fault-tolerance control that can maintain three-phase equilibrium in a case of stack failures and minimize power imbalances between the stacks. The problem of the conventional neutral-point voltage-shifting control is presented based on the output power. In addition, the power imbalance is improved by performing selective neutral-point voltage-shifting control according to the reference voltage range. To verify the principle and feasibility of the proposed neutral-point voltage-shifting control method, a simulation and an experiment are implemented with the CNHB inverter.

scholarly journals A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 876 ◽  
Author(s):  
Qinyue Zhu ◽  
Wei Dai ◽  
Lei Guan ◽  
Xitang Tan ◽  
Zhaoyang Li ◽  
...  
Keyword(s):  
Fault Tolerance ◽  
Control Strategy ◽  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Neutral Point ◽  
Modular Multilevel Converter ◽  
Phase Voltage ◽  
Multilevel Converter ◽  
Shift Control

In view of the complex calculation and limited fault tolerance capability of existing neutral point shift control algorithms, this paper studies the fault-tolerant control method for sub-module faults in modular multilevel converters on the basis of neutral point compound shift control strategy. In order to reduce the calculation complexity of shift parameters in the traditional strategy and simplify its implementation, an improved AC side phase voltage vector reconstruction method is proposed, achieving online real-time calculation of the modulation wave adjustment parameters of each phase required for fault-tolerant control. Based on this, a neutral point DC side shift control method is proposed to further improve the fault tolerance capability of the modular multilevel converter (MMC) system by compensating the fault phase voltage with non-fault phase voltage. By means of the compound shift control strategy of the DC side and AC side of the neutral point, an optimal neutral point position is selected to ensure that the MMC system output line voltage is symmetrical and the amplitude is as large as possible after fault-tolerant control. Finally, the effectiveness and feasibility of the proposed control strategy are verified by simulation and low-power MMC experimental system testing.

scholarly journals Research on output power quality control technology of three-phase inverter

2021 ◽  
Vol 2108 (1) ◽  
pp. 012077
Author(s):  
Yinfeng Zhang ◽  
Ying Shao ◽  
Kang Lei ◽  
Kongxian Wang
Keyword(s):  
Quality Control ◽  
Power Quality ◽  
Output Power ◽  
Control Method ◽  
Development Trend ◽  
Control Technology ◽  
Phase Inverter ◽  
Advantages And Disadvantages ◽  
Three Phase ◽  
Three Phase Inverter

Abstract With the wide application of new energy and distributed generation system, high-performance inverter plays an important role as the key link of power system access. Its performance determines the quality of output power. Therefore, the output power quality control technology of three-phase inverter has become one of the important research directions in this field. This paper introduces the current main inverter power quality control methods, summarizes and compares the advantages and disadvantages of a single control method, and points out that the composite control method is the development trend of inverter output power quality control technology.

Three phase z-source neutral point clamped inverter with multicarrier PWM technique

2016 ◽  
Vol 35 (5) ◽  
pp. 1575-1591 ◽  
Author(s):  
F.X. Edwin Deepak ◽  
V. Rajasekaran
Keyword(s):  
Electromagnetic Interference ◽  
Electronic Device ◽  
Neutral Point ◽  
Voltage Source ◽  
Electrical Power System ◽  
Content Type ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Switching Losses ◽  
Three Phase

Purpose The purpose of this paper is to present the three phase seven-level Z-source neutral point clamped (NPC) inverter with multicarrier pulse-width modulation (PWM) technique. Despite numerous topologies and modulation methods, there is a dire need of developing PWM techniques that can be deployed in multilevel inverters. These inverters decrease the total harmonic distortion and it has a good performance for various electrical power system applications. The proposed inverter is investigated for its performance by executing it in shoot through and non-shoot through modes. Design/methodology/approach The purpose is validated through MATLAB/Simulink software platform for implementing the proposed seven-level Z-source NPC inverter outlined with multicarrier based phase disposition technique. The experimental results are verified using SPARTAN 3E FPGA controller with the same control strategy. Findings The efficiency of the proposed inverter is confirmed in terms of increased and faster conversion in the shoot-through mode. By using PDPWM technique the maximum boost gain is achieved with lower modulation index. High control of DC voltage is obtained with only one DC voltage source and one Z network. Originality/value Three phase multilevel inverters are widely used in improving the output voltage quality and reducing the encountered electromagnetic interference in electronic device or circuitry. They are employed in medium and high –power applications to attain increased power ratings while decreasing the switching losses. The performance results shown in this paper will satisfy the above needs of usage in certain applications and less switching losses.

scholarly journals Control Method of Four Wire Active Power Filter Based on Three-Phase Neutral Point Clamped T-Type Converter

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8427
Author(s):  
Dawid Buła ◽  
Grzegorz Jarek ◽  
Jarosław Michalak ◽  
Marcin Zygmanowski
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Neutral Point ◽  
Laboratory System ◽  
Power Filter ◽  
Input Filter ◽  
Three Phase

An active power filter based on a three-level neutral point clamped T-type converter with LCL input filter is presented in the paper. The main goal of the paper is the analysis of a control system that ensures independent control of a current in each phase. The presented control method of the filter allows reactive power compensation and/or a higher harmonics reduction to be achieved in each phase independently, with the possibility of control tan (φ) coefficient. This allows the power flow between the phases to be minimalized and reduces the RMS values of filter currents without the need to balance grid currents. The analysis presents the possibility of an operation in different modes, which was verified by experimental results. The results have been obtained in a 20 ARMS laboratory system described in the paper. The results reveal relatively low power losses, which are a feature of the selected three-level T-type topology. Additionally, that topology, when compared to a two-level one, ensures the reduction in current ripples with the same parameters of passive components.

scholarly journals L1 Adaptive Loss Fault Tolerance Control of Unmanned Hypersonic Aircraft with Elasticity

Aerospace ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 176
Author(s):  
Zhaoying Li ◽  
Shuai Shi
Keyword(s):  
Fault Tolerance ◽  
Pid Controller ◽  
Control Method ◽  
Adaptive Controller ◽  
Hypersonic Vehicle ◽  
L1 Adaptive Control ◽  
Hypersonic Aircraft ◽  
L1 Adaptive Controller ◽  
Tolerance Control ◽  
Loss Of Actuator Effectiveness

This paper investigates the fault tolerance control of hypersonic aircrafts with L1 adaptive control method in the presence of loss of actuator effectiveness fault. The hypersonic model considers the uncertainties caused by the features of nonlinearities and couplings. Elasticity is taken into account in hypersonic vehicle modeling which makes the model more accurate. A velocity L1 adaptive controller and an altitude L1 adaptive controller are designed to control flexible hypersonic vehicle model with actuator loss fault. A PID controller is designed as well for comparison. Finally, the simulation results are used to analyze the effectiveness of the controller. Compared to the results of PID controller, L1 controllers have better performance.

scholarly journals Performance of Neutral Point Clamped Five Level Inverter Using Space Vector Modulation Control Fed by DPC-VF-SVM Rectifier

2021 ◽  
Vol 16 ◽  
pp. 275-287
Author(s):  
Djamila Cherifi ◽  
Yahia Miloud ◽  
Mohamed Mostefai
Keyword(s):  
Pulse Width Modulation ◽  
Control Method ◽  
Neutral Point ◽  
Voltage Source ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Three Phase ◽  
Bus Voltage ◽  
Non Linear Load ◽  
Vector Modulation

The purpose of this paper is to develop a control and regulation method for the input DC voltage of a five level neutral point clamping (NPC) inverter feeding a induction motor. In this context, the authors propose in the first part, the control strategy of three-phase pulse width modulation rectifier, they propose the virtual flux-based direct control (DPC_VF) with vector modulation (SVM), this method is applied for the enhancement of network power quality by compensation of harmonic currents produced by an non linear load, and good regulation of DC-bus voltage. The second part of the paper is dedicated to the presentation of the model of the three phase, five-level NPC voltage source inverter with its space vector modulation (SVM) control method. The performance of the proposed strategy in terms of out-put voltage and THD has studied successfully and shown using MATLAB/Simulink.

Three-Level SVPWM Controller Design Based on FPGA

2010 ◽  
Vol 142 ◽  
pp. 188-193
Author(s):  
Guo Xiang Chang ◽  
Wen Li ◽  
Xiu Ling Liu
Keyword(s):  
Output Power ◽  
Response Rate ◽  
Control Method ◽  
Controller Design ◽  
Multilevel Inverter ◽  
Research Subjects ◽  
Multilevel Inverters ◽  
Excellent Control ◽  
Space Vectors ◽  
Large Output

Compared with traditional two-level inverter, the multilevel inverter has many advantages such as large output power and small output harmonic. And also it is one of the hot research subjects in recent years. Although SVPWM control is an excellent control method, its space vectors is exponential with the increase of the number of output levels of the multilevel inverters. If the SVPWM is controlled by DSP, a lot of components can be used. So this paper puts forward a new method which SVPWM signals generate by PGFA directly. The fact has proved that pure hardware design is feasible and has rapid response rate, facile programming and online configuration.

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