Proposal of a 5kVA single-phase on-line UPS with high frequency isolation and power factor correction

Bascope, Rene P. T.; Branco, G.C.; Cruz, Carlos Eduardo Braga; Oliveira, Eduardo F. de; Sousa, Gean J. M.

doi:10.1109/cobep.2009.5347694

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Based on typical online UPS system, a cluster of improved online UPS systems are proposed during the decades, who are more skilled at regulating active power to achieve unity power factor [9]- [13]. Additional DC/DC [9], [10], high frequency transformer [11], [12] and modular structure are three main issues that are chosen to achieve a cost-effective, volume-effective and more reliable online UPS system [13].…”

Section: Proposed Control Scheme For Online Ups Systemmentioning

confidence: 99%

“…k_avr , G v_rec , δ k_rec , δ kref , δ a_avr and G ph_rec as restoration value of voltage amplitude, phase order (a, b, c), RMS voltage reference in central controller, averaged value of each phase RMS voltage value, voltage compensation block transfer function, phase restoration value of voltage phase, phase reference in central controller (utility phase angle), averaged value of phase angle and phase compensation blocks transfer function respectively,In this scenario, the compensation blocks are implemented by using two typical PIs, shown in(12) and(13),…”

mentioning

confidence: 99%

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High-performance control of paralleled three-phase inverters for residential microgrid architectures based on online uninterruptable power systems

Zhang

Guerrero

Vasquez

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In this paper, a control strategy for the parallel operation of three-phase inverters forming an online uninterruptible power system (UPS) is presented. The UPS system consists of a cluster of paralleled inverters with LC filters directly connected to an AC critical bus and an AC/DC forming a DC bus. The proposed control scheme is performed on two layers: (i) a local layer that contains a "reactive power vs phase" in order to synchronize the phase angle of each inverter and a virtual resistance loop that guarantees equal power sharing among inverters; (ii) a central controller that guarantees synchronization with an external real/fictitious utility, and critical bus voltage restoration. Constant transient and steadystate frequency, active, reactive and harmonic power sharing, and global phase-locked loop resynchronization capability are achieved. Detailed system topology and control architecture are presented in this paper. Also a mathematical model was derived in order to analyze critical parameters effect on system stability. An experimental setup was built in order to validate the proposed control approach under several case-study scenarios. Finally, a conclusion is presented.

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Section: Proposed Control Scheme For Online Ups Systemmentioning

confidence: 99%

mentioning

confidence: 99%

High-performance control of paralleled three-phase inverters for residential microgrid architectures based on online uninterruptable power systems

Zhang

Guerrero

Vasquez

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…With the development of power electronic devices, the high-frequency isolation gradually becomes the most important isolation scheme for next generation power electronic converters due to its weight and volume reduction. Then several UPSs with this newly introduced characteristic have been proposed [20]- [28].…”

Section: Introductionmentioning

confidence: 99%

“…The UPS, which adds a dc/dc boost circuit and a dc/dc charger to the topology in Fig. 4, was proposed in [27]- [28], the simplified diagram can be shown in Fig. 5.…”

Section: Introductionmentioning

confidence: 99%

Next-Generation Multi-Functional Modular Intelligent UPS System for Smart Grid

Zhao

Song

Liu

et al. 2013

IEEE Trans. Ind. Electron.

125

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This paper analyzed the development trend of UPS and presented a multi-functional modular intelligent UPS system for smart grid, which is composed of four identical H-bridge converters. It not only can realize all the basic functions of the traditional UPS system, but also can realize the cyclic use of the electrical power between the power grid and storage battery. And due to the modular construction, it can easily change into various power converters for other applications. The topology configuration and operating principle of the proposed UPS system are analyzed, and a distributed control management strategy and a distributed logic control algorithm are proposed. At last, experimental results verify the validity and effectiveness of the proposed system and its control strategy. The exploration of this study could provide some valuable references for the design of next-generation electrical equipment in smart grid.

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