• Title/Summary/Keyword: dc/ac inverter

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비대칭 전압 제어를 이용한 단상 임베디드 Z-소스 DC-AC 인버터 (A Single-Phase Embedded Z-Source DC-AC Inverter by Asymmetric Voltage Control)

  • 오승열;김세진;정영국;임영철
    • 전력전자학회논문지
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    • 제17권4호
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    • pp.306-314
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    • 2012
  • In case of the conventional DC-AC inverter using two DC-DC converters with unipolar output capacitor voltages, for generating the AC output voltage, the output capacitor voltages of its each DC-DC converter must be higher than the DC input voltage. To solve this problem, this paper proposes a single-phase DC-AC inverter using two embedded Z-source converters with bipolar output capacitor voltages. The proposed inverter is composed of two embedded Z-source converters with common DC source and output AC load. The AC output voltage is obtained by the difference of the output capacitor voltages of each converter. Though the output capacitor voltage of converter is relatively low compared to the conventional method, it can be obtained the same AC output voltage. Moreover, by controlling asymmetrically the output capacitor voltage, the AC output voltage of the proposed system is higher than the DC input voltage. To verify the validity of the proposed system, a DSP(TMS320F28335) based single-phase embedded Z-source DC-AC inverter was made and the PSIM simulation was performed under the condition of the DC source 38V. As controlled symmetrically and asymmetrically the output capacitor voltages of each converter, the proposed inverter could produce the AC output voltage with sinusoidal waveform. Particularly, in case of asymmetric control, a higher AC output voltage was obtained. Finally, the efficiency of the proposed system was measured as 95% and 97% respectively in case of symmetric and asymmetric control.

마이크로컨트롤러를 이용한 벅-부스트 DC-AC 인버터 설계 (Design of Buck-Boost DC-AC Inverter Using Microcontroller)

  • 박종규
    • 조명전기설비학회논문지
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    • 제23권10호
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    • pp.45-51
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    • 2009
  • 단상 벅-부스트 DC-AC 인버터는 2개의 DC-DC 컨버터로 이루어져 있다. 두 컨버터는 $180[^{\circ}]$의 위상차를 가지는 DC 바이어스된 정현파 기준 전압에 의해 구동된다. 교류로 출력되는 인버터의 최대값은 직류 입력전압 크기에 제약을 받지 않아 입력 직류전원보다 높은 교류 출력전압을 만들 수 있다. 본 논문에서는 벅-부스트 DC-AC인버터를 설계하고, 프로토타입을 제작하여 실험한다. 전압과 전류 제어기는 마이크로컨트롤러를 이용한 디지털 제어기로 구현된다.

Half Load-Cycle Worked Dual SEPIC Single-Stage Inverter

  • Chen, Rong;Zhang, Jia-Sheng;Liu, Wei;Zheng, Chang-Ming
    • Journal of Electrical Engineering and Technology
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    • 제11권1호
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    • pp.143-149
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    • 2016
  • The two-stage converter is widely used in traditional DC/AC inverter. It has several disadvantages such as complex topology, large volume and high loss. In order to overcome these shortcomings, a novel half load-cycle worked dual SEPIC single-stage inverter, which is based on the analysis of the relationship between input and output voltages of SEPIC converters operating in the discontinuous conduction mode (DCM), is presented in this paper. The traditional single-stage inverter has remarkable advantages in small and medium power applications, but it can’t realize boost DC/AC output directly. Besides one pre-boost DC/DC converter is needed between the DC source and the traditional single-stage inverter. A novel DC/AC inverter without pre-boost DC/DC converter, which is comprised of two SEPIC converters, is studied. The output of dual SEPIC converters is connected with anti-parallel and half load-cycle control is used to realize boost and buck DC/AC output directly and work properly, whatever the DC input voltage is higher or lower than the AC output voltage. The working principle, parameter selection and the control strategy of the inverters are analyzed in this paper. Simulation and experiment results verify the feasibility of the new inverter.

2대의 임베디드 Z-소스 컨버터를 이용한 단상 DC-AC 인버터 (A Single-Phase DC-AC Inverter Using Two Embedded Z-Source Converters)

  • 김세진;정영국;임영철;최준호
    • 전기학회논문지
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    • 제60권6호
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    • pp.1152-1162
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    • 2011
  • In this paper, a single-phase DC-AC inverter using two embedded Z-source converters is proposed. The proposed inverter is composed of two embedded Z-source converters with common DC source and output AC load. The output AC voltage of the inverter is obtained by the difference of output capacitor voltages of each converter. The output voltage of each converter take shape of the asymmetrical AC waveform centering zero voltage. Therefore, the proposed inverter can generate the same output voltage despite low VA rating L-C elements, compared to the conventional inverter using high DC voltage with AC ripple. To verify the validity of the proposed system, the PSIM simulation was achieved under the condition of rapid increase of DC source (110[V]${\rightarrow}$150[V]) and R-load (50[${\Omega}$]${\rightarrow}$300[${\Omega}$]). For controlling the voltage of the inverter system, the one-cycle controller was adopted. As results, the proposed inverter output the constant AC voltage (220[V]rms/60[Hz]) for all conditions. Also, the R-L load and nonlinear diode load were adopted for the proposed inverter loads, and we could know that the its output voltage characteristics were as good as the pure R-load. Finally, the RMS and THD of output AC voltage were examined for the different loads, input DC voltages and reference voltage signals.

배터리 에너지 저장 장치를 위한 2단 DC-DC-AC 컨버터의 모델링 방법 (Modeling and Control of a Two-Stage DC-DC-AC Converter for Battery Energy Storage System)

  • 현동엽;정석언;현동석
    • 전력전자학회논문지
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    • 제19권5호
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    • pp.422-430
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    • 2014
  • This study proposes a small-signal model and control design for a two-stage DC-DC-AC converter to investigate its dynamic characteristics in relation to battery energy storage system. When the circuit analysis of the two-stage DC-DC-AC converter is attempted simultaneously, the mathematical procedure of deriving the dynamic equation is complex and difficult. The main idea of modeling the two-stage DC-DC-AC converter states that this topology is separated into a bidirectional DC-DC converter and a single-phase inverter with an equivalent current source corresponding to that of the inverter or converter. The dynamic equations for the separated converter and inverter are then derived using the state-space averaging technique. The procedures of building the small-signal model of the two-stage DC-DC-AC converter are described in detail. Based on the derived small-signal model, the individual controllers are designed through a frequency-domain analysis. The simulation and experimental results verify the validity of the proposed modeling approach and controller design.

Diagnosis Methods for IGBT Open Switch Fault Applied to 3-Phase AC/DC PWM Converter

  • Im, Won-Sang;Kim, Jang-Sik;Kim, Jang-Mok;Lee, Dong-Choon;Lee, Kyo-Beum
    • Journal of Power Electronics
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    • 제12권1호
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    • pp.120-127
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    • 2012
  • Fault diagnosis technique of electrical drives is becoming more and more important, since voltage fed converter system has become industrial standard in many applications. Many studies have been conducted an inverter fault diagnosis for induction motors. However, there are few researches about fault diagnosis of 3-phase ac/dc PWM (Pulse Width Modulation) converter compared to the dc/ ac inverter. The ac/dc converter is the opposite of dc/ac inverter at current flow. Also, inverter and converter have different current patterns under the same condition of IGBT (Insulated gate bipolar transistor) open switch fault. Therefore, it is difficult to apply intact diagnosis methods of inverter to the converter. This paper proposes modified fault detection methods for IGBT open switch fault in 3-phase ac/dc PWM converter by modifying established fault diagnostic methods for dc/ac inverters.

3상 벅-부스트 DC-AC 인버터 설계 (Design of Three-phase Buck-Boost DC-AC Inverter)

  • 박종규;장은승;최현칠;신휘범
    • 전기학회논문지
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    • 제58권12호
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    • pp.2396-2401
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    • 2009
  • The three-phase buck-boost DC-AC inverter generates three alternating output voltages as the differential voltage of three DC-DC individual buck-boost converters. Three converters are driven with three DC-biased and 1200 phase-shifted sinusoidal references. The peak value of the inverter alternating output voltage can be larger or smaller than the value of the direct input voltage. In this paper, a three-phase buck-boost DC-AC inverter is designed and implemented on a prototype with digital controller using a microcontroller.

Half Load-Cycle Worked Dual Input Single Output DC/AC Inverter

  • Chen, Rong;Zhang, Jia-Sheng
    • Journal of Power Electronics
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    • 제14권6호
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    • pp.1217-1223
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    • 2014
  • A novel half load-cycle worked dual input single output (DISO) DC/AC inverter is presented. The basic circuit consists of a dual buck regulator, which works in continuous current mode. The working principle of DISO DC/AC inverter has been used. The control method applied for half load-cycle worked DISO DC/AC inverter has been studied. The control effects of the open-loop proportional control and closed-loop proportional-integral control are compared by using PSIM software. The parameters are adopted in the realistic simulation and experiment test. Moreover, the waveforms, such as voltage of modulation reference signal and output voltage, were given. The simulation and experiment results proved that the half load-cycle worked DISO DC/AC inverter could achieve good performance, gain a line frequency of 50 Hz, and verify the correctness of theoretical analysis.

자립형 태양광 발전 시스템을 위한 3상 양방향 DC-AC 인버터 연구 (The Study of 3-Phase Bi-Directional DC to AC Inverter for the Bi-Model PV PCS)

  • 양승대;정승환;최주엽;최익;이영권
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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    • pp.319-324
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    • 2012
  • This paper presents the study of 3-Phase bi-directional DC to AC inverter with unity power factor. 3-Phase bi-directional DC to AC inverter is important for the bi-modal PV PCS with an energy storage system. Both Inverting and converting are needed to connect between the grid side and boost converting side to charge and discharge the energy storage system. The paper proposes the appropriate circuit topology and proper control system for the bi-directional inverter. It also proposes the method of selecting the optimum control method considering system stability. PSIM simulation is used to validate the proposed algorithm.

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냉장고의 선형압축기 구동을 위한 단상 하프브리지 인버터 시스템에서 직류단 불평형 보상에 관한 연구 (DC Voltage Balancing Control of Half-Bridge PWM Inverter for Liniear Compressor of Refrigerator)

  • 김호진;김형진;김동윤;김장목
    • 전력전자학회논문지
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    • 제22권3호
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    • pp.256-262
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    • 2017
  • This paper presents the control algorithm of a single-phase AC/DC/AC PWM converter for the linear compressor of a refrigerator. The AC/DC/AC converter consists of a full-bridge PWM converter for the control of the input power factor and a half-bridge PWM inverter for the control of the single-phase linear compressor. At the DC-link of this topology, two capacitors are connected in series. These DC-link voltages must be balanced for safe operation. Thus, a new control method of DC voltage balancing for the half-bridge PWM inverter is proposed. The balancing algorithm uses the Integral-Proportional controller and inserts the DC-offset current at the Proportional-Resonant current controller of the inverter to solve the DC-link unbalanced voltages between the two capacitors. The proposed algorithm can be easily implemented without much computation and additional hardware circuit. The usefulness of the proposed algorithm is verified through several experiments.