Dual-Buck Half-Bridge Voltage Balancer

Zhang, Xianjin; Gong, Chunying

doi:10.1109/tie.2012.2202363

Cited by 115 publications

(50 citation statements)

References 15 publications

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“…The unbalanced loads connected to the positive and the negative poles can be simulated by operating the DC-DC converter with different duty ratios. Figure 4 shows the power circuit of the dual-buck voltage balancer and its controller proposed in [10], including two unbalanced resistive loads. It consists of two IGBT switches, two diodes, two inductors, and two capacitors.…”

Section: Lower Level Controlmentioning

confidence: 99%

“…However, the proposed control in [9] displays low accuracy because it has only proportional control without integral control. In order to improve the balancing performance, a dual-buck voltage balancer with proportional integral (PI) control of voltage was proposed [10]. This voltage balancer offers better accuracy than the previous voltage balancers, even though the number of components is more.…”

Section: Introductionmentioning

confidence: 99%

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A Half-Bridge Voltage Balancer with New Controller for Bipolar DC Distribution Systems

Han

2016

Energies

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This paper proposes a half-bridge voltage balancer with a new controller for bipolar DC distribution systems. The proposed control scheme consists of two cascaded Proportional Integral (PI) controls rather than one PI control for balancing the pole voltage. In order to confirm the excellence of voltage balancing performance, a typical bipolar DC distribution system including a half-bridge voltage balancer with proposed controller was analyzed by computer simulations. Experiments with a scaled prototype were also carried out to confirm the simulation results. The half-bridge voltage balancer with proposed controller shows better performance than the half-bridge voltage balancer with one PI control for balancing the pole voltage.

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Section: Lower Level Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Half-Bridge Voltage Balancer with New Controller for Bipolar DC Distribution Systems

Han

2016

Energies

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“…In many circumstances [1]- [4], it is quite normal to have single-phase utilities so single-phase rectifiers are very popular [5]- [9]. A typical application of rectifiers is shown in Figure 1, where it is often needed to provide two separate voltage outputs with the presence of a neutral line so that it is possible to power loads at three different voltage levels [10]. For example, many electronic systems need ±5 V and/or ±15 V. Rectifiers based on conventional half-bridge rectifiers, as shown in Figure 2, are very attractive because they can provide two voltage outputs at relatively low costs.…”

Section: Introductionmentioning

confidence: 99%

A Single-Phase Rectifier Having Two Independent Voltage Outputs With Reduced Fundamental Frequency Voltage Ripples

Ming

Zhong

2015

IEEE Trans. Power Electron.

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Half-bridge rectifiers are able to provide two voltage outputs, which offers three voltage levels, but the two voltage outputs depend on each other and also on system parameters. Moreover, the two voltage outputs contain large ripples because the currents following through the split capacitors contain significant fundamental-frequency components. In this paper, after analysing the drawbacks of half-bridge rectifiers in detail, an independently controlled neutral leg is added to conventional half-bridge rectifiers to address these drawbacks. Furthermore, the associated decoupling control strategies are proposed. The rectification leg from the conventional half-bridge rectifier is controlled to maintain the DC-bus voltage and to draw a clean sinusoidal current that is in phase with the supply voltage. The neutral leg is controlled with a PI-repetitive controller to regulate one voltage output and also to provide the current path for any DC and/or fundamental-frequency components. As a result, the two voltage outputs are regulated independently and are robust against system parameters. The output voltage ripples are also reduced and, hence, the required capacitance to achieve the same level of voltage ripples is reduced. Experimental results are provided to validate the performance of the proposed singlephase rectifiers having two independent voltage outputs.

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“…Generally, there are two types of dc microgrids [1], [4]: unipolar-type and bipolar-type. The first type has only one voltage level in a two-wire dc distribution system.…”

Section: Introductionmentioning

confidence: 99%

“…This paper will focus on the research of a voltage balancer. The conventional topologies of bridge-type converters can suffer from a shoot-through risk, which is a major drawback to the reliability of this type of voltage balancer [4]. In addition, MOSFETs with lower switching loss and conducting loss cannot be used directly in conventional bridge converters due to the poorer characteristic of the MOSFET body-diode.…”

Section: Introductionmentioning

confidence: 99%

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

Liu¹,

Zhu²,

Jia³

et al. 2015

Journal of Power Electronics

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DC microgrids are considered as prospective systems because of their easy connection of distributed energy resources (DERs) and electric vehicles (EVs), reduction of conversion loss between dc output sources and loads, lack of reactive power issues, etc. These features make them very suitable for future industrial and commercial buildings' power systems. In addition, the bipolar-type dc system structure is more popular, because it provides two voltage levels for different power converters and loads. To keep voltage balanced in such a dc system, a bidirectional dual buck-boost voltage balancer with direct coupling is introduced based on P-cell and N-cell concepts. This results in greatly enhanced system reliability thanks to no shoot-through problems and lower switching losses with the help of power MOSFETs. In order to increase system efficiency and reliability, a novel burst-mode control strategy is proposed for the dual buck-boost voltage balancer. The basic operating principle, the current relations, and a small-signal model of the voltage balancer are analyzed under the burst-mode control scheme in detail. Finally, simulation experiments are performed and a laboratory unit with a 5kW unbalanced ability is constructed to verify the viability of the bidirectional dual buck-boost voltage balancer under the proposed burst-mode control scheme in low-voltage bipolar-type dc microgrids.

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Dual-Buck Half-Bridge Voltage Balancer

Cited by 115 publications

References 15 publications

A Half-Bridge Voltage Balancer with New Controller for Bipolar DC Distribution Systems

A Half-Bridge Voltage Balancer with New Controller for Bipolar DC Distribution Systems

A Single-Phase Rectifier Having Two Independent Voltage Outputs With Reduced Fundamental Frequency Voltage Ripples

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids

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