scholarly journals Full-Silicon 98.7% Efficient Three-Phase Five-Level 3-port UPS Architecture with Wide Voltage Range Battery based on Multiplexed Topology

2020 ◽  
Author(s):  
Kepa Odriozola ◽  
Thierry A. Meynard ◽  
Alain Lacarnoy
Keyword(s):  
Voltage Range ◽  
Three Phase ◽  
Level 3

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 An Improved T-type Switched-Capacitor Based 3-level 3-Phase Inverter with Common Mode Voltage Elimination and Voltage Boosting Capability

2021 ◽  
Author(s):  
Arpan Hota ◽  
sumon dhara ◽  
venu sonti ◽  
sachin jain ◽  
Vivek Agarwal
Keyword(s):  
Modulation Depth ◽  
Voltage Source ◽  
Switched Capacitor ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Three Phase ◽  
Level 3 ◽  
Space Vectors ◽  
Vector Modulation ◽  
Type 3

<p>Zero common mode voltage (ZCMV) space vector modulation (SVM) strategy applied to a three-phase multilevel inverter (MLI) eliminates the common mode voltage (CMV). However, the usage of ZCMV-SVM strategy reduces the number of levels in the output voltage and requires higher magnitude dc voltage source due to the reduced modulation depth of the employed PWM scheme. Moreover, the usage of a single dc-source in such systems may have issues with respect to capacitor voltage balancing. Taking into account all the above issues, a 3-level inverter solution is proposed in this manuscript. The complete details of the method used for developing the proposed solution using the ZCMV space vectors is also included in this paper. The proposed topology utilizes a unique combination of a T-type 3-level inverter and a switched-capacitor (SC) circuit to achieve ZCMV performance with a single dc-source of low magnitude at a reduced component count. Analysis of the CMV and terminal voltages along with the design of the SCs are presented in this paper. The proposed topology is compared with the existing topologies to prove its unique merits over the other 3LI solutions with ZCMV capability. All the claims are validated using simulation and experimental results.</p>

Electrical Machines – Basic Operating Principles 3-117 Polyphase i.e. Three-Phase a.c. Supplies 3-120 Circuit Protective Devices 3-124 Circuit Protective Devices and Earth Fault Protection 3-125 Worksheet 1–8 (MC Questions) 3-127 Answers to Worksheets 1 to 8 3-133 4 Occupational Unit 4 (Level 2) Electrical Installation (Buildings and Structures) 4-135 EAW Regulations and Codes of Practice 4-136 IET Regulations (BS 7671) 4-144 Part 1. Deals with the Scope, Object and Fundamental Requirements for Safety 4-144 Part 2. Deals with Definition 4-144 Part 3. Deals with the Assessment of General Characteristics 4-144 Part 4. Deals with the Protection for Safety 4-145 Part 5. Deals with the Selection and Erection of Equipment 4-145 Part 6. Deals with Special Installations or Locations 4-145 Part 7. Deals with Inspection and Testing 4-146 IET Regulations (BS 7671) 4-147 Special Locations 4-150 Communication on Site 4-153 Choosing a Wiring System 4-154 Electrical Components used in Electrotechnical Systems 4-156 Secure Electrical Isolation 4-158 Measuring and Marking Out 4-159 Fixing and Installing Equipment 4-161 Tools and Equipment used for Electrical Installations 4-162 Correct Disposal of Waste Material 4-164 Worksheet 12 (MC Questions) 4-167 Answers to Worksheets 1 to 12 4-173 Level 3 Certificate in Electrotechnical Technology

2006 ◽  
pp. 4-4
Keyword(s):  
Earth Fault ◽  
Protective Devices ◽  
Codes Of Practice ◽  
Fault Protection ◽  
Three Phase ◽  
Level 3 ◽  
Electrical Components ◽  
Level 2 ◽  
Wiring System ◽  
Electrical Installation
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