• Title, Summary, Keyword: bidirectional inverter

Search Result 78, Processing Time 0.034 seconds

Bidirectional High-Frequency Link Inverter with Deadbeat Control

  • Salam, Zainal
    • Journal of Power Electronics
    • /
    • v.9 no.5
    • /
    • pp.726-735
    • /
    • 2009
  • This paper presents a Bidirectional High-Frequency Link (BHFL) inverter that utilizes the Deadbeat controller. The main features of this topology are the reduced size of the inverter and fewer power switches. On the secondary side of the transformer, the active rectifier employs only two power switches, thus reducing switching losses. Using this configuration, the inverter is capable of carrying a bidirectional power flow. The inverter is controlled by a Deadbeat controller, which consists of the inner current loop, outer voltage loop and a feedforward controller. Additional disturbance decoupling networks are employed to improve the system's robustness towards load variations. A 1-kVA prototype inverter has been constructed and the Deadbeat control algorithm is experimentally verified. The experimental results show that the inverter has high efficiency (91%) with low steady state output voltage total harmonics distortion (1.5%).

Design and Control of a Bidirectional Power Conversion System with 3-level T-type Inverter for Energy Storage Systems

  • Sung, Won-Yong;Ahn, Hyo Min;Oh, Chang-Yeol;Lee, Byoung Kuk
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.1
    • /
    • pp.326-332
    • /
    • 2018
  • In this paper, the design process and the control method of the power conversion system (PCS) that consists of a bidirectional DC-DC converter and a 3-level T-type inverter for an energy storage system is presented. Especially the design method of the output LCL filter for a 3-lvel T-type inverter without complex mathematical process are proposed. The validity of the control method and design process in this paper are verified through simulation and experimental analysis.

Loss Analysis and Comparison of Grid-connected Bidirectional Inverter with Different Types of PWM Schemes (PWM 방식에 따른 계통연계 양방향 인버터의 손실양상 비교 및 분석)

  • Heo, Sung-Jun;Ahn, Hyo-Min;Byun, Jong-Eun;Lee, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.22 no.6
    • /
    • pp.547-550
    • /
    • 2017
  • This paper presents a loss analysis and compares three pulse width modulation (PWM) methods applied in a three-phase grid-connected bidirectional inverter for an energy storage system. The losses in switching devices and output low pass filters are theoretically analyzed by using PWM control techniques. Grid-connected bidirectional inverters are designed by using PWM techniques, and the designed inverters are simulated to verify the analysis results.

Bq-ZSI fed Induction Motor Drive System Using Modified Space Vector Modulation (변형 공간벡터 변조 기법이 적용된 Bq-ZSI를 이용한 유도전동기 구동시스템)

  • Han, Sang-Hyup;Kim, Heung-Geun;Cha, Honnyong;Chun, Tea-Won;Nho, Eui-Cheol
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.23 no.1
    • /
    • pp.9-15
    • /
    • 2018
  • This study investigates a bidirectional quasi-Z-source inverter (Bq-ZSI) system with bidirectional power transfer capability and a modified space vector modulation scheme for reducing the ripple of the inductor current. By replacing the diode in the impedance network with an active switch, the power flow can be bidirectional. The average inductor current of the Bq-ZSI network is negative in the regenerative braking mode, thereby regenerating the power. In addition, modified space vector modulation scheme is applied to the Bq-ZSI to control shoot-through time effectively. A 5 kW prototype is built and tested to implement the proposed system. Experimental results show that the Bq-ZSI system is capable of regenerative braking of the induction motor and that the modified space vector modulation method is efficient.

A High-Efficiency Bidirectional AC/DC Topology for V2G Applications

  • Su, Mei;Li, Hua;Sun, Yao;Xiong, Wenjing
    • Journal of Power Electronics
    • /
    • v.14 no.5
    • /
    • pp.899-907
    • /
    • 2014
  • This paper proposes a single-phase bidirectional AC/DC converter topology applied in V2G systems, which consists of an inverter and a bidirectional non-inverting buck-boost converter. This topology can operate in four modes: buck charging, boost charging, buck discharging and boost discharging with high input current quality and unity input power factor. The inverter switches at line frequency, which is different from conventional voltage source inverters. A bidirectional buck-boost converter is utilized to adapt to a wider charging voltage range. The modulation and control strategy is introduced in detail, and the switching patterns are optimized to reduce the current ripple. In addition, the semiconductor losses are analyzed. Simulation and experimental results demonstrate the validity and effectiveness of the proposed topology.

An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications

  • Zhang, Lianghua;Yang, Xu;Chen, Wenjie;Yao, Xiaofeng
    • Journal of Power Electronics
    • /
    • v.10 no.3
    • /
    • pp.235-244
    • /
    • 2010
  • This paper presents a new isolated soft-switching bidirectional buck-boost inverter for fuel cell applications. The buck-boost inverter combines an isolated DC-DC converter with a conventional inverter to implement buck-boost DC-DC and DC-AC conversion. The main switches achieve zero voltage switching and zero current switching by using a novel synchronous switching SVPWM and the volume of the transformer in the forward and fly-back mode is also minimized. This inverter is suitable for wide input voltage applications due to its high efficiency under all conditions. An active clamping circuit reduces the switch's spike voltage and regenerates the energy stored in the leakage inductance of the transformer; therefore, the overall efficiency is improved. This paper presents the operating principle, a theoretical analysis and design guidelines. Simulation and experimental results have validated the characteristics of the buck-boost inverter.

Analysis and Design of a Bidirectional Cycloconverter-Type High Frequency Link Inverter with Natural Commutated Phase Angle Control

  • Salam, Zainal;Lim, Nge Chee;Ayo, Shahrin Md.
    • Journal of Power Electronics
    • /
    • v.11 no.5
    • /
    • pp.677-687
    • /
    • 2011
  • In this paper a cycloconverter-type high frequency transformer link inverter with a reduced switch count is analyzed and designed. The proposed topology consists of an H-bridge inverter at the transformer's primary side and a cycloconverter with three bidirectional switches at the secondary. All of the switches of the cycloconverter operate in non-resonant zero voltage and zero current switching modes. To overcome a high voltage surge problem resulting from the transformer leakage inductance, phase angle control based on natural commutation is employed. The effectiveness of the proposed inverter is verified by constructing s 750W prototype. Experimentally, the inverter is able to supply a near sinusoidal output voltage with a total harmonic distortion of less than 1%. For comparison, a PSpice simulation of the inverter is also carried out. It was found that the experimental results are in very close agreement with the simulation.

New Three-Phase Multilevel Inverter with Shared Power Switches

  • Ping, Hew Wooi;Rahim, Nasrudin Abd.;Jamaludin, Jafferi
    • Journal of Power Electronics
    • /
    • v.13 no.5
    • /
    • pp.787-797
    • /
    • 2013
  • Despite the advantages offered by multilevel inverters, one of the main drawbacks that prevents their widespread use is their circuit complexity as the number of power switches employed is usually high. This paper presents a new multilevel inverter topology with a considerable reduction in the number of power switches used through the switch-sharing approach. The fact that the proposed inverter applies two bidirectional power switches for sharing among the three phases does not prevent it from producing seven levels in the line-to-line output voltage waveforms. A modified scheme of space vector modulation via the application of virtual voltage vectors is developed to generate the PWM signals of the power switches. The performance of the proposed inverter is investigated through MATLAB/SIMULINK simulations and is practically tested using a laboratory prototype with a DSP-based modulator. The results demonstrate the satisfactory performance of the inverter and verify the effectiveness of the modulation method.

A Cascaded Multilevel Inverter Using Bidirectional H-bridge Modules

  • Kang, Feel-Soon;Joung, Yeun-Ho
    • Journal of international Conference on Electrical Machines and Systems
    • /
    • v.1 no.4
    • /
    • pp.448-456
    • /
    • 2012
  • This paper presents a multilevel inverter configuration which is designed by insertion of a bidirectional switch between capacitive voltage sources and a conventional H-bridge module. The modified inverter can produce a better sinusoidal waveform by increasing the number of output voltage levels. By serial connection of two modified H-bridge modules, it is possible to produce 9 output voltage levels including zero. There are 24 basic switching patterns with the 9 output voltage levels. Among the patterns, we select the 2 most efficient switching patterns to get a lower switching loss and minimum dv/dt stress. We then analyze characteristics of Total Harmonic Distortion (THD) of the output voltage with variation of input voltage by computer-aided simulations and experiments.

Regenerative Current Control Method of Bidirectional DC/DC Converter for EV/HEV Application

  • Lee, Jung-Hyo;Jung, Doo-Yong;Lee, Taek-Kie;Kim, Young-Ryul;Won, Chung-Yuen
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.1
    • /
    • pp.97-105
    • /
    • 2013
  • The control method of the bidirectional DC/DC converter for instantaneous regenerative current control is described in this paper. The general method to control the DC/DC converter is the output voltage control. However, the regenerative current cannot be controlled to be constant with this control method. To improve the performance of the conventional control method, the DC-link voltage of the inverter is controlled within the tolerance range by the instantaneous boost and buck operations of the bidirectional DC/DC converter. By the proposed control method, the battery current can be controlled to be constant regardless of the motor speed variation. The improved performance of the DC/DC converter controlled by the proposed control method is verified by the experiment and simulation of the system with the inverter and IPMSM(Interior Permanent Magnet Synchronous Motor) which is operated by the reduced practical speed profile.