Three-phase Full Bridge Research Articles

Fault-tolerant Integration of Charge and Discharge Information Security for Multi-Scale Time Series Models

In this paper, the power mode of winding and converter topology are integrated. Considering the filter characteristics and electromagnetic torque control of the system during charging/discharging, the integrated structures of one-phase full bridge, three-phase full bridge and three-phase four-arm bridge are studied. The single-phase all-bridge integrated structure can completely suppress the electromagnetic torque generated by the motor during charging and discharging, and make the filtering effect of the system better. In this project, a multi-scale full convolutional deep neural network method based on time series is studied. The multi-scale full convolution time series model is used for training, and the future continuous signals can be monitored according to the trained model based on the power signal data collected from high-voltage power lines. Experiments show that the proposed method can effectively extract the required data.

A Novel Architecture of a Six Degrees of Freedom Parallel Platform

With the rapid development of the manufacturing industry, industrial automation equipment represented by computer numerical control (CNC) machine tools has put forward higher and higher requirements for the machining accuracy of parts. Compared with the multi-axis serial platform solution, the parallel platform solution is theoretically more suitable for high-precision machining equipment. There are many parallel platform solutions, but not one can provide a common physical platform to test the effectiveness of a variety of control algorithms. To achieve the goals, this paper is based on the Stewart six degrees of freedom parallel platform, and it mainly studies the platform construction. This study completed the mechanical structure design of the parallel platform. Based on the microprogrammed control unit (MCU) + pre-driver chip + three-phase full bridge solution, we have completed the circuit design of the motor driver. We wrote the program of MCU to drive six parallel robotic arms as well as the program of the parallel platform control center on the PC, and we completed the system joint debugging. The closed-loop control effect of the parallel platform workspace pose is realized.

Three-Phase Filter-Clamped Transformerless Inverter for Grid-Connected Photovoltaic Systems with Low Leakage Current

In this paper, a Filter-Clamped (FC) inverter is employed as a three-phase grid-connected Transformerless Photovoltaic (TLPV) inverter. TLPV inverters are more efficient and more cost-effective compared to the alternatives based on high and low-frequency isolation transformers. On the other hand, TLPV inverters generate high leakage current due to the removal of the isolation transformer. Prior-art TLPV topologies have been developed to overcome this issue by either adding more semiconductor switches to block potential leakage current paths or modifying the control method. In contrast, the FC inverter addresses the leakage current issue without adding any extra component or improving the control technique. Thus, it is a promising solution to TLPV systems. Having decreased the leakage current, the FC inverter improves the THD of grid injected current and the efficiency compared to the conventional three-phase Full-Bridge (FB) inverter. Simulations and experiments are provided to validate the effectiveness of the FC inverter in terms of reduced leakage current, improved grid current THD, and improved overall efficiency.

Design and Construction of Model Battery Charging Control for Stand-alone self-Excited Induction generator

In this paper, design and construction of model battery charging control for stand-alone wind driven self-excited induction generator SEIG) is present. Apart from an energy transfer function from wind turbine (WT) with stand-alone SEIG, the proposed model battery charging control can also be an active power in linear loads with stand-alone for a three-phase four wire system. Initially, mathematical modeling of the wind turbine with stand-alone SEIG is given. The simulation based on mathematical equations obtained from the model provides electrical characteristics of the wind turbine source that which will be use as the battery charging control input of the inverter. Secondly, the main system has been virtually create in order to actualize the conversion from DC to AC and the main power circuit employs insulated gate bipolar transistors (IGBTs) formed in a three-phase full bridge. Thirdly, the control circuit is discuss and has been design and the control method used is voltage control with microcontroller for stand-alone linear loads that is simple. Finally, the obtained results are discusses in order to verify the correct operation as the system is designed.

Three-phase photovoltaic grid inverter system design based on PIC24FJ256GB110 for distributed generation

<span lang="EN-US">In recent years, the demand for energy generated by photovoltaics has increased because of the cheapness of this energy, especially in the Middle East. This study focuses on the design and implementation of a three-phase photovoltaic inverter system for distribution of generator applications. The three-phase inverter used in this study was designed using GWM 100-01X1 as a three-phase full bridge MOSFET package. The MOSFET full bridge of the three-phase inverter is driven using IR2104 gate driver IC, and the Hall sensors of the voltage and current are used to measure the AC and DC voltage and current. The SPWM signal is generated using a PIC24FJ256GB110 as a microcontroller and interfaced to the full bridge package. Simulation and experimental results are presented to validate the three-phase inverter design.</span>

Current Control of the Permanent-Magnet Synchronous Generator Using Interval Type-2 T-S Fuzzy Systems

The current control of the permanent-magnet synchronous generator (PMSG) using an interval type-2 (IT2) Takagi-Sugeno (T-S) fuzzy systems is designed and implemented. PMSG is an energy conversion unit widely used in wind energy generation systems and energy storage systems. Its performance is determined by the current control approach. IT2 T-S fuzzy systems are implemented to deal with the nonlinearity of a PMSG system in this paper. First, the IT2 T-S fuzzy model of a PMSG is obtained. Second, the IT2 T-S fuzzy controller is designed based on the concept of parallel distributed compensation (PDC). Next, the stability analysis can be conducted through the Lyapunov theorem. Accordingly, the stability conditions of the closed-loop system are expressed in Linear Matrix Inequality (LMI) form. The AC power from a PMSG is converted to DC power via a three-phase six-switch full bridge converter. The six-switch full bridge converter is controlled by the proposed IT2 T-S fuzzy controller. The analog-to-digital (ADC) conversion, rotor position calculation and duty ratio determination are digitally accomplished by the microcontroller. Finally, simulation and experimental results verify the performance of the proposed current control.

Isolated DC/DC converter with three‐level high‐frequency link and bidirectional power flow ability for electric vehicles

A high-frequency isolated bidirectional DC/DC converter based on the combination of an H-bridge, a three-level half-bridge and a three-phase full bridge topology is proposed for electric vehicle applications. The 24 V low-voltage battery pack is the power supply of the converter and it is raised to about 144 V, which is then converted to three-phase AC voltage to drive the induction motor. A multilevel high-frequency link is proposed to implement the conversion from the low voltage side (LVS) to the high voltage side (HVS). The switching patterns and single-phase three-level pulse width modulation is proposed to maintain the voltage on HVS and to control the power flowing out of the battery. The zero voltage switching characteristics of the low rating-voltage metal-oxide-semiconductor field-effect transistors on LVS and HVS are analyzed. The algorithms to suppress DC bias of magnetising current and to equalise the capacitor voltages are also introduced. The effectiveness and the control strategy of the proposed converter are verified by simulation and experimental results.

Dynamic Response Enhancement and Fault Protection of Boost Converter-Fed Brushless DC Motor in Aerospace Applications

The permanent magnet (PM) brushless DC (BLDC) machine has been widely used in various applications due to its high reliability and simplicity. In aerospace applications, the requirements of its dynamic acceleration characteristic and fault protection capability have further increased. This paper proposes an optimized inverter topology composed of a boost converter, two protective power switches, and a three-phase full bridge for the dynamic response improvement and fault protection capability enhancement of PM BLDC machines. The corresponding drive logic, control method, and protection strategy are designed to develop a drive system for an aeronautical fuel pump. The response performance is significantly improved in handling under-voltage and over-rated conditions by utilizing the boost converter during different processes, and the protection capability is enhanced to deal with over-voltage and over-current fault isolation. A boost converter-fed BLDC pump system prototype is built and tested. It is concluded that the simulation and experiment results verify the rationality and validity of the proposed method.

Dual‐frequency‐controlled C‐TPTL DC−DC converter for high and wide input voltage applications

Traditional three-level (TL) DC−DC converters are suitable for the power conversion with high-input voltage, but the performance of the converter is difficult to be optimized within a wide-input-voltage range. A combined three-phase TL (C-TPTL) DC−DC converter suitable for high and wide input-voltage applications was investigated, and the topology consists of a TL clamping cell and a three-phase full-bridge (TPFB) sub-converter cell. The TL clamping cell ensures that the voltage stress on switches is half of the input voltage, and the TPFB cell reduces the current rating of switches and the output filter requirement. Meanwhile, the C-TPTL converter can operate in the half-input-voltage mode and full-input-voltage mode by controlling the switching sequence of the TL clamping cell. The relationship between the input and output voltages, and the choice of the boundary between different operation modes were discussed. Also, the loss analysis to achieve the optimal efficiency was included. A 200–600 V input and 48 V–20 A output prototype was fabricated and tested in the lab, and the experimental results can effectively verify the theoretical analysis and the performance of the C-TPTL converter.

Phase Current Reconstruction and Control of Three-Phase Switched Reluctance Machine With Modular Power Converter Using Single DC-Link Current Sensor

According to the modular power converter, a novel phase current reconstruction method using single dc-link current sensor is proposed for three-phase switched reluctance machine (SRM), and the control method is implemented with the reconstructed phase current as well. A highly integrated modular power converter is constructed by a three-phase full bridge and a dual switch module. The phase windings are in star-connection, and the bipolar phase currents are applied. Based on the special operating modes and single pulse width modulation signal injection, the dc-link current is decoupled and the phase current in both magnetization and demagnetization regions is reconstructed, which is very critical for the implementation of some advanced methods that require complete period phase current. The conventional control methods of the SRM, such as single-pulse voltage and hysteresis current control methods, are carried out under different operating conditions with both simulation and experiment to verify the effectiveness of the proposed method, and the reconstruction errors and performance influences are detailed analyzed as well.

Fault diagnosis of power electronic circuits based on wavelet packet decomposition and LibSVM

A new fault diagnosis method is proposed in this paper for power electronic circuit. An experimental platform of the three-phase full bridge controlled rectifier is built to test the proposed method. The output DC voltage is selected as the original signal to avoid the misdiagnosis because of load change. The features of the original signal are extracted by using the theory of wavelet packet decomposition. The standard deviation of each frequency component of the 3 layer constitutes the feature vector and then the different types of faults are identified by using LibSVM. Satisfied simulation and experiment results are obtained.

Three‐phase resistive capacitor switching transient limiter for mitigating power capacitor switching transients

This study presents a new resistive capacitor switching transient limiter (RCSTL) for mitigating power capacitor switching transients. The RCSTL is composed of three limiting resistors, a three-phase full bridge diode rectifier, a thyristor and a three-phase coupling transformer. The limiting resistors are connected in series with the capacitor bank and the thyristor is installed at the DC side of the diode rectifier. During the capacitor bank energising, the thyristor remains off and hence, the secondary side of the coupling transformer acts as open circuit. Consequently, high impedance including the transformer's magnetic reactance in parallel with the limiting resistors is inserted in series with the capacitor bank. Under such circumstance, the limiting resistors restrain the capacitor switching transients. In the steady-state, the control system triggers the thyristor and the coupling transformer acts as short circuit. As a result, the limiting resistors are bypassed by the coupling transformer and thus, the RCSTL has no significant effect on the circuit. Analytical analysis is performed to describe different operation modes of the proposed RCSTL. A single stage of a three-phase wye-connected capacitor bank with 25 kVAR is energised and the performance of the proposed limiter is investigated. Both the simulation and experimental results confirm the effectiveness of the RCSTL.

Online Inverter Fault Diagnosis of Buck-Converter BLDC Motor Combinations

Brushless dc (BLDC) motors are commonly used in space application for its simplicity and high reliability. The fault-tolerant control (FTC) of the motor is important for its continuous operating capacity even under the faulty situation. The fault diagnosis should be achieved in advance in order to implement the FTC strategy. This paper proposes an online model-based inverter fault diagnosis method for three-phase full bridge inverter with buck dc-dc converter based on the high-speed BLDC motor with low inductance and nonideal back electromotive force in a magnetically suspended control moment gyro. The method can detect and identify both open-circuit and short-circuit damages of single switch in buck converter or three-phase full bridge. Also, protective measures are proposed to isolate the fault and avoid the secondary fault. Both simulation and experimental results are taken out to prove the validity and effectiveness of the proposed fault diagnosis method.

Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM

This paper describes an optimal configuration for multicentral inverters in a medium-voltage (MV) grid, which is suitable for large-scale photovoltaic (PV) power plants. We theoretically analyze a proposed common-mode equivalent model for problems associated with multicentral transformerless-type three-phase full bridge (3FB) PV inverters employing two-winding MV transformers. We propose a synchronized pulse width modulation (PWM) control strategy to effectively reduce the common-mode voltages that may simultaneously occur. In addition, we propose that the existing 3FB topology may also have the configuration of a multicentral inverter with a two-winding MV transformer by making a simple circuit modification. Simulation and experimental results of three 350 kW PV inverters in a multicentral configuration verify the effectiveness of the proposed synchronization control strategy. The modified transformerless-type 3FB topology for a multicentral PV inverter configuration is verified using an experimental prototype of a 100 kW PV inverter.

New inverter topology for ground current suppression in transformerless photovoltaic system application

An interesting inverter topology is proposed in this paper. It is similar to the typical three-phase full bridge inverter from the topology point of view, but smartly designed for the ground current reduction in single-phase photovoltaic (PV) inverter applications. Theoretical analysis is conducted to clarify the operation mechanism of the proposed topology. Performance evaluation is carried out to verify the effectiveness of the proposed topology for the ground current suppression.

중전압 계통 연계를 위한 멀티 센트럴 대용량 태양광 발전 시스템의 공통 모드 전압 억제

This paper describes an optimal configuration for multi-central inverters in a medium-voltage (MV) grid, which is suitable for large-scale photovoltaic (PV) power plants. We theoretically analyze a proposed common-mode equivalent model for problems associated with multi-central transformerless-type three-phase full bridge(3-FB) PV inverters employing two-winding MV transformers. We propose a synchronized PWM control strategy to effectively reduce the common-mode voltages that may simultaneously occur. In addition, we propose that the existing 3-FB topology may also have the configuration of a multi-central inverter with a two-winding MV transformer by making a simple circuit modification. Simulation and experimental results of three 350kW PV inverters in a multi-central configuration verify the effectiveness of the proposed synchronization control strategy. The modified transformerless-type 3-FB topology for a multi-central PV inverter configuration is verified using an experimental prototype of a 100kW PV inverter.

A new modeling method for S-MCSRM driven by three-phase full bridge converter

Purpose – The S-MCSRM is a two-phase excited switched reluctance motor (SRM), with the short flux path and mutual inductance coupling, which is suitable for the oil submersible pump application owing to large torque and three-wire connection with the standard full-bridge power converter. However, there is not literature to disclose its model due to the complicated mutual inductance coupling. The FEM model is a time-consuming method to analyze this motor. For the first time, this paper aims to propose an S-MCSRM model for performance analysis and control method developing. The proposed model would save simulation time and be a theoretical fundamental for further implementing control algorithm. Design/methodology/approach – The S-MCSRM's operating principle is analyzed, and the voltage equation and the generated torque are deduced. The FEM is utilized to obtain the five typical magnetization curves that describe the S-MCSRM's magnetic path characteristic. The magnetic co-energy equation, phase torque and total torque equations are obtained. From the basic voltage equation, the S-MCSRM's state space model is built for the dynamic analysis and control purpose. The S-MCSRM is widely analyzed in detail by using the proposed model and comparison with the conventional SRM. JMAG finite element package is used to verify the proposed model. Findings – The proposed modeling method is validated by the identical results to those from FEM-based JMAG software. The proposed model just takes second-level time, which is far less than minute-level time consuming of FEM method. The S-MCSRM generates larger torque than the conventional SRM, with three-wire and standard full bridge power converter, and it is confirmed that the S-MCSRM is suitable for the oil submersible pump applications. Originality/value – This paper proposes a new modeling method for the S-MCSRM to exactly analyze the motor's operating performances, and also it is a theoretical fundamental for developing control algorithm. The proposed model saves much time in analysis, calculation, and simulation, when compared to the FEM method. The completed analysis including flux linkages, torque, torque-ripple, and torque-speed characteristic discloses the S-MCSRM's steady-state operating performances, which provides the deep insight for this kind of motor's applications.

Research on the Application of New Active Inverter Technology in Battery Maintenance

This paper presents a discharge inspection method based on new active inverter feedback discharge after comparison with the check discharge from pure resistance of power station batteries. A new active inverter system has been developed with SPWM pulse width modulation technology, which is based on DC/DC circuitry, along with a three-phase full bridge inverter and control topology circuits. In addition, the principle for selecting the parameters of RCL elements of the system has been analyzed. This paper also presents a detection method combining active detection with passive detection for the islanding effect which exists in the grid-connected discharge system, according to the islanding effect of grid-connected discharge equipment, so as to stably discharge without interference on the grid.

A ZVS-PWM Three-Phase Current-Fed Push–Pull DC–DC Converter

In this paper, a ZVS-PWM three-phase current-fed push-pull dc-dc converter is proposed. When compared to single-phase topologies, the three-phase dc-dc conversion increases the power density, uses the magnetic core of the transformer more efficiently, reduces the stress on switches, and requires smaller filters since the frequency for its design is higher. The proposed converter employs an active clamping technique by connecting the primary side of the transformer to a three-phase full bridge of switches and a clamping capacitor. This circuit allows the energy from the leakage inductances to be reused, increasing the efficiency of the converter. If appropriate parameters are chosen, soft-commutation of the switches (ZVS) can also be achieved. The soft-commutation improves the efficiency even further, allows higher switching frequencies to be used, and reduces the electromagnetic interference significantly. Applications such as fuel cell systems, transportation, and uninterruptable power supplies are some examples that can benefit from the advantages presented by this converter. The theoretical analysis, a design example, and the experimental results for a prototype implementing this topology are presented. The prototype was designed to process 4 kW at full load with an input voltage of 120 V, an output voltage of 400 V, and a switching frequency of 40 kHz.

Study of Three-Phase Full Bridge Spwm VSI

In order to reveals the dynamic, nonlinear work process of three-phase SPWM inverter, simulation model of three-phase full bridge voltage source SPWM inverter was built. Typical figure of voltage, current and spectrum was given and analyzed. Figures include line voltage of load, phase voltage of load, neutral point voltage of load, source current wave, Fourier analysis, Total Harmonic Distortion of voltage and current, inverter input impedance, line to line impedance. This Simulation model and results can be used as auxiliary in teaching, scientific research and product development. This simulation model was intuitive, commutative, being able to display graphs dynamically. Using this simulation model in class, the difficult in teaching three-phase full bridge SPWM inverter will be solved, it can also advance students’ studying interests and strengthen their understanding and save class hours. This simulation model has important value.