10 results on '"BIN WU"'
Search Results
2. Analysis of a distributed maximum power point tracking tracker with low input voltage ripple and flexible gain range.
- Author
-
Bin Wu, Naderi, Roozbeh, and Smedley, Keyue
- Subjects
MAXIMUM power point trackers ,DISTRIBUTION (Probability theory) ,MAXIMUM power transfer theorem ,ELECTRIC potential ,TOPOLOGY ,CASCADE converters - Abstract
Partial shading effects on series-connected solar cells (modules) motivate the development of distributed maximum power point tracking (DMPPT) technology. This study reviews three dominant DMPPT architectures with preference given to DMPPT tracker technology based on its modularity, gain flexibility and technical maturity for decades of development. Topologies suitable for DMPPT tracker application are investigated. A modified buck-boost converter with reduced input voltage ripple and flexible-gain range is adopted for DMPPT tracker application. At steady state, the topology can reduce the power oscillation at maximum power point and improve the tracking accuracy without increasing input filter capacitor. The flexibility in gain range makes it well-suited for many commercial solar energy harvest systems under rapidly varying temperature and illumination conditions. The simulation and experiment of a 15 W low-power prototype under small voltage scale confirm the feasibility of the proposed converter. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
3. Generalised approach for predictive control with common-mode voltage mitigation in multilevel diode-clamped converters.
- Author
-
Venkata Yaramasu, Bin Wu, Rivera, Marco, Narimani, Mehdi, Kouro, Samir, and Rodriguez, Jose
- Subjects
VOLTAGE control ,CASCADE converters ,PREDICTIVE control systems ,DISCRETE-time systems ,DIRECT currents - Abstract
This study proposes a generalised approach based on model predictive strategy for the current control, dc-link capacitor voltages balancing, switching frequency reduction and common-mode voltage mitigation in multilevel diodeclamped converters. A generalised discrete-time model of the converters is presented, where all the control objectives are formulated in terms of the switching states. The control goals are expressed as a cost function, and with the help of suitable weighting factors these goals are met simultaneously. The cost function minimisation is used as criteria for choosing the best switching state which would be applied to the converter during next sampling interval. The real-time digital control issues such as computational burden and delay compensation are also discussed. The feasibility of the proposed method is verified by simulations in three- to six-level converters, and by experiments in three- and fourlevel converters. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
4. Reference-Trajectory-Optimized SVM for High-Power Current-Source Converters to Improve Harmonic Performance and Reduce Common-Mode Voltage.
- Author
-
Anping Hu, Dewei (David) Xu, Bin Wu, Jiacheng Wang, and Jianhui Su
- Subjects
ELECTRONIC modulation ,IDEAL sources (Electric circuits) ,CASCADE converters ,ELECTRIC potential ,HARMONIC analyzers - Abstract
For medium-voltage high-power drives fed by current-source converters (CSCs), a transformerless configuration has benefits in both cost and volume. Removing the isolation transformer necessitates a common-mode choke to undertake the major portion of the drive's common-mode voltage (CMV) stress, which would otherwise cause premature failure of the motor insulation system. On the other hand, as device switching frequency in high-power CSCs is normally limited to a few hundred hertz, improving harmonic performance via modulation has always been a challenge. Selective harmonic elimination (SHE) is a preferred modulation scheme in such a system owing to its ability to eliminate several unwanted low-order harmonic currents. Alternatively, conventional space vector modulation (SVM) provides continuous modulation index adjustment capability, but its output current contains low-order harmonics with high magnitudes that may arouse harmful resonances in the system. Aiming at reducing CMV and improving harmonic performance at the same time, this paper proposes a new SVM-based modulation strategy for high-power CSCs using synthesized reference trajectory on the hexagon in the αβ plane. Along with the proposed strategy, two methods of reference trajectory optimization (RTO) are investigated. By introducing a coefficient to the duty-cycle function for RTO, the first method can remove an extra low-order harmonic component, or minimize the weighted total harmonic distortion. The second method, with a different approach of RTO, eliminates the unwanted low-order harmonics by combining the proposed SVM with the SHE. The proposed concepts are verified by both simulation and experimental results. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
5. A New Nested Neutral Point-Clamped (NNPC) Converter for Medium-Voltage (MV) Power Conversion.
- Author
-
Narimani, Mehdi, Bin Wu, Zhongyuan Cheng, and Zargari, Navid Reza
- Subjects
- *
CASCADE converters , *ELECTRIC potential , *ELECTRIC power conversion , *SEMICONDUCTORS , *ELECTRONIC modulation , *CAPACITORS - Abstract
In this paper, a new voltage source converter for medium voltage applications is presented which can operate over a wide range of voltages (2.4-7.2 kV) without the need for connecting the power semiconductor in series. The operation of the proposed converter is studied and analyzed. In order to control the proposed converter, a space-vector modulation (SVM) strategy with redundant switching states has been proposed. SVM usually has redundant switching state anyways. What is the main point we are trying to get to? These redundant switching states help to control the output voltage and balance voltages of the flying capacitors in the proposed converter. The performance of the converter under different operating conditions is investigated in MATLAB/Simulink environment. The feasibility of the proposed converter is evaluated experimentally on a 5-kVA prototype. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
6. Predictive Control of a Three-Level Boost Converter and an NPC Inverter for High-Power PMSG-Based Medium Voltage Wind Energy Conversion Systems.
- Author
-
Yaramasu, Venkata and Bin Wu
- Subjects
- *
CASCADE converters , *WIND power , *ENERGY conversion , *ELECTRIC inverters , *PREDICTIVE control systems , *PERMANENT magnet generators - Abstract
In this paper, a new medium voltage power converter topology using a diode rectifier, three-level boost (TLB) converter, and neutral-point-clamped (NPC) inverter is proposed for a high-power permanent magnet synchronous generator-based wind energy conversion system. The generator-side TLB converter performs the maximum power point tracking and balancing of dc-link capacitor voltages, while the grid-side NPC inverter regulates the net dc-bus voltage and reactive power to the grid. A significant improvement in the grid power quality is accomplished as the NPC inverter no longer controls the dc-link neutral point voltage. A model predictive strategy is proposed to control the complete system where the discrete-time models of the proposed power electronic converters are used to predict the future behavior of control variables. These predictions are evaluated using two independent cost functions, and the switching states which minimize these cost functions are selected and applied to the generator- and grid-side converters directly. In order to comply with the high-power application, the switching frequencies of the TLB converter and NPC inverter are minimized and maintained below 1.5 and 1 kHz, respectively. The proposed topology and control strategy are verified through MATLAB simulations on a 3-MW/3000-V/577-A system and dSPACE DS1103-based experiments on 3.6-kW/208-V/10-A prototype. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
7. Multilevel Direct Power Control—A Generalized Approach for Grid-Tied Multilevel Converter Applications.
- Author
-
Rivera, Sebastian, Kouro, Samir, Bin Wu, Alepuz, Salvador, Malinowski, Mariusz, Cortes, Patricio, and Rodriguez, Jose
- Subjects
CASCADE converters ,ELECTRIC power distribution grids ,ELECTRIC potential ,SWITCHING circuits ,BRIDGE circuits - Abstract
This paper presents a generalized multilevel direct power control (ML-DPC) scheme for grid-connected multilevel power converters. The proposed method extends the original DPC operating principle by considering only the closest subset of two-level voltage vectors to the present switching state. The implementation of this principle requires the power derivatives for feedback, which can present numerical problems when applied experimentally, mainly due to high measurement noise sensitivity. Therefore, a derivative estimator is proposed based on the converter-grid model in the synchronous reference frame. In addition, a virtual flux observer is developed to achieve synchronization and improve robustness in the presence of grid voltage harmonics. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper, simulations and experimental results are presented for a seven-level cascaded H-bridge converter. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
8. Control Strategy With a Generalized DC Current Balancing Method for Multimodule Current-Source Converter.
- Author
-
Zhihong Bai, Hao Ma, Dewei Xu, and Bin Wu
- Subjects
DIRECT currents ,CASCADE converters ,WAVE analysis ,ELECTRIC transformers ,CAPACITORS ,ELECTRIC inductors - Abstract
Higher power applications require a multilevel converter to meet high power ratings. A multimodule current-source converter (CSC) can provide a multilevel current waveforms and at the same time eliminate the bulky transformer at the ac side. However, it is required for the multimodule CSC to use multiple dc-link inductors for the purpose of power balance among different modules. Thus, one key issue in the design of the multimodule CSC is to balance the current through different dc-link inductors. This paper focuses on studying the control strategy of the multimodule CSC and a generalized current balancing method is presented. As presented, zero vectors are distributed based on the deviation of the dc-link inductor currents and the comparison of the capacitor voltages. Therefore, the current imbalance problems, not only those among the upper inductors but also those among the lower inductors are solved. Moreover, since the current balancing algorithm is not dependent on module numbers, the presented control strategy is very suitable for modularization. Especially, with the feedback of the capacitor voltages, the resonance arising from the inductor-capacitor (LC) filter is damped. In addition, a design method of the dc-link inductors is also derived. Finally, simulation and experimental results show the validity of the propositions. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
9. A Novel Decoupled Interconnecting Method for Current-Source Converter-Based Offshore Wind Farms.
- Author
-
Popat, M., Bin Wu, and Zargari, N. R.
- Subjects
- *
INTEGRATED circuit interconnections , *MATHEMATICAL decoupling , *IDEAL sources (Electric circuits) , *CASCADE converters , *WIND power plants , *PULSE width modulation - Abstract
This paper presents a novel interconnecting approach for the permanent-magnet synchronous generator-based offshore wind farm, where cascaded pulsewidth modulated (PWM) current-source converters (CSCs) are employed on both generator- and grid-side. The total numbers of cascaded PWM CSCs for the onshore grid connection are equal to the number of wind generators installed in the wind farm. The proposed interconnecting method enables simple configuration without the need for a bulky and costly offshore converter substation. Furthermore, a new decoupled control scheme for the independent active and reactive power control with variable dc-link current regulation is developed for the grid-side converters. The key feature of the control scheme is that the minimized dc-link current control is achieved without the use of a long-distance communication link. Both simulation and experimental results are provided to verify the effectiveness of the proposed control scheme. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
- Full Text
- View/download PDF
10. Multilevel Voltage-Source-Converter Topologies for Industrial Medium-Voltage Drives.
- Author
-
Rodríguez, José, Bernet, Steffen, Bin Wu, Pontt, Jorge 0., and Kouro, Samir
- Subjects
ELECTRIC current converters ,VOLTAGE-frequency converters ,ELECTRONIC circuits ,CAPACITORS ,ELECTRIC inverters ,TECHNOLOGICAL innovations ,ELECTRICAL engineering ,CASCADE converters ,ELECTRIC circuits - Abstract
This paper presents a technology review of voltage-source-converter topologies for industrial medium-voltage drives. In this highly active area, different converter topologies and circuits have found their application in the market. This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point- clamped, cascaded H-bridge, and flying-capacitor converters. This paper presents the operating principle of each topology and a review of the most relevant modulation methods, focused mainly on those used by industry. In addition, the latest advances and future trends of the technology are discussed. It is concluded that the topology and modulation-method selection are closely related to each particular application, leaving a space on the market for all the different solutions, depending on their unique features and limitations like power or voltage level, dynamic performance, reliability, costs, and other technical specifications. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.