The parallel operation of two UPS by the coupled-inductor method

Chen, J.F.; Chu, Ching‐Lung; Huang, Chien-Ming

doi:10.1109/isie.1992.279701

Cited by 25 publications

(6 citation statements)

References 6 publications

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“…There are some VSCs used as the master in the microgrid with the master-slave control structure [9], and some VSCs used as the grid interface in the UPS system [33,34]. Usually, these VSCs are equipped with ESs or fuel cells on the DC side, and their grid interface is VC mode.…”

Section: Classification Of Vscsmentioning

confidence: 99%

Modeling framework of voltage-source converters based on equivalence with synchronous generator

Tan

Geng

Yang

et al. 2018

J. Mod. Power Syst. Clean Energy

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Along with the increasing penetration of distributed generation with voltage-source converters (VSCs), there are extensive concerns over the potential virtual rotor angle stability, which is characterized by oscillations of power and frequency during the dynamic process of synchronization in the grid. Several control strategies have been developed for VSCs to emulate rotating inertia as well as damping of oscillations. This paper classifies these strategies and provides a small-signal modeling framework including all kinds of VSCs in different applications for virtual rotor angle stability. A unified perspective based on the famous Phillips-Heffron model is established for various VSCs. Thus, the concepts of equivalent inertia and the synchronizing and damping coefficients in different VSCs are highlighted, based on the similarities with the synchronous generator (SG) system in both physical mechanisms and mathematical models. It revealed the potentiality of various VSCs to achieve equivalence with the SG. This study helps promote the unity of VSCs and traditional SGs in both theories and methods for analyzing the dynamic behavior and enhancing the stability. Finally, future research needs and new perspectives are addressed.

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Section: Classification Of Vscsmentioning

confidence: 99%

Modeling framework of voltage-source converters based on equivalence with synchronous generator

Tan

Geng

Yang

et al. 2018

J. Mod. Power Syst. Clean Energy

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“…This makes running cost very economical. So far, according to the types and market share, there are basically two types of solar cells: Bulk Type and Thin Film Type, respectively [8][9].…”

Section: A Types Of Solar Cellsmentioning

confidence: 99%

Intelligent fuzzy logic controller for a solar charging system

Huang

et al. 2009

2009 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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This paper presents an intelligent solar charging system with fuzzy logic control method. With the scarce energy source and the worsening environmental pollution, how to create and use a clean and never exhausted energy is becoming very important day by day. This solar charging system is composed of a solar cell, a charger, batteries, a buck converter and a digital signal processor. In the meantime, it also combines the fuzzy logic method with the tactics of charging to improve the efficiency of charging, suppress the abnormal battery temperature rise, lengthen the battery's life, and reduce the waste used. Finally, experimental and simulation results are shown to demonstrate the effectiveness and validity of the system.

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“…Generally, the voltagecontrolled PWM inverters(VCP1) are used for parallel operation in which the power distribution of each VCPI units is controlled with a PLL circuit for synchronization [4]. However, the output voltage of each VCPI units may be different and may cause the circulating current to destruct the paralleled system [5]. Chen[tj] proposed the combination of one VCPI master unit and (n-1) CCPI slave units for parallel operation.…”

Section: Introductionmentioning

confidence: 99%

Voltage and current hybrid controlled PWM inverters using variable structure control

Chen

Kuo

Liang³

1999

Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475)

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In this paper, the voltage and current hybrid PWM inverters using variable structure control technique is proposed fur parallel operation. The voltage-controlled PWM inverter(VCPI) unit is developed to provide a specific sinusoidal output voltage and the current-controlled PWM inverter(CCPI) units are employed to track the distributive current. Eiich of the VCPI and CCPI units can be operated independendly. By using the variable structure control scheme, the parallel inverters can provide excellent performance without phase-lock-loop(PLL) circuit for synchronization. The proposed a8cheme can result in fast dynamic response and robustness to parameter variations. Finally, simulation results are performed to verify the proposed control scheme.

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The parallel operation of two UPS by the coupled-inductor method

Cited by 25 publications

References 6 publications

Modeling framework of voltage-source converters based on equivalence with synchronous generator

Modeling framework of voltage-source converters based on equivalence with synchronous generator

Intelligent fuzzy logic controller for a solar charging system

Voltage and current hybrid controlled PWM inverters using variable structure control

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