Modelling of three-phase grid-connected inverters

Smedley, K.M.; Guiotto, E.M.; Vacher, F.; Jin, Tao

doi:10.1504/ijgei.2006.011261

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…Where i¢reJ = ke j(J v ¢' k is a constant, V ¢ is the phase voltage, () = ±1T /2, VIII = ERs / Re' Based on the two equations, OCC-STATCOM large signal dynamic model can be built as shown in [9,10].…”

Section: )mentioning

confidence: 99%

Research on the technology of ultra-long power supply in low voltage for tunnel construction

Wang

et al. 2013

2013 IEEE Power &Amp; Energy Society General Meeting

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Voltage drop in the cable line is a significant problem in today's ultra-long low voltage power supply system. It caused the problem that electricity demands of the system and the requirement of transmission distance cannot be fulfilled. The technique that imports 10 kV or 35 kV class Voltage into the tunnel has been used as the solution. But it extends the project cycle, largely increases the budget and brings security concerns. The paper analyses the 400 V long distance power supply problem and compares reactive power compensation devices through MatIab/Simulink simulations, such as the shunt capacitor, SVC (Static Var Compensator), STATCOM (Static Synchronous Compensator) and OCC-STATCOM. The OCC STATCOM demonstrates better capacity of real-time power load tracking and shows higher transmission power in the construction. The paper also does OCC-ST A TCOM correction based on real projects.technical characteristics, such as faster regulating speed, wider operating range, smaller harmonic current, etc. But the market share of SVC is much bigger than ST ATCOM devices for its low-cost and simple techniques [1][2][3][4].

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Section: )mentioning

confidence: 99%

Research on the technology of ultra-long power supply in low voltage for tunnel construction

Wang

et al. 2013

2013 IEEE Power &Amp; Energy Society General Meeting

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“…The dc voltage across the stack of the fuel cell is governed by the Nernst equation (7). And the (dc) power produced by fuel cell is given by (8). The definitions of other constants are given in the Appendix.…”

Section: A Modeling Of Sofcmentioning

confidence: 99%

“…A large signal dynamic model for the OCC inverter was derived using the switching flow-graph modeling method [10] as presented in [8]. This model was verified experimentally to be accurate and effective in [8] and it is adopted in this paper.…”

Section: B Modeling Of Occ Invertermentioning

confidence: 99%

“…This model was verified experimentally to be accurate and effective in [8] and it is adopted in this paper. The MATLAB SIMULINK representation of the OCC inverter model is shown in Fig.…”

Section: B Modeling Of Occ Invertermentioning

confidence: 99%

“…The study is preformed using MATLAB SIMULINK tool. The SOFC is represented by a linear model [5] , while the OCC inverter has a large signal model [8] . A new power control approach of the system is proposed to improve the fuel cell load-following performance by utilizing the fast transient inverter and energy stored by the capacitor buffer.…”

Section: Introductionmentioning

confidence: 99%

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Load-Following Improvement of Fuel Cells with Fast Transient OCC Inverter

Wen¹,

Smedley²

Proceedings, 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

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Fuel cells typically have much longer response time than the electrical grid to which they are connected through the inverter, which may cause a voltage disturbance at the connection point when the load experiences a sudden change. This situation can be alleviated via proper power control. This paper utilizes the fast transient nature of the inverter to improve the load-following capability of the fuel cells. A linear model of SOFC and a large signal model of OCC inverter are used to analyze the response of the integrated fuel cell/inverter system to a step change in load. A closed-loop power control approach is proposed to achieve a fast system dynamic response, and a comparison is made with the conventional power control approach. The results indicate that with the help of a parallel capacitor of appropriate value, the proposed control approach is able to improve the load-following capability of the fuel cell to a load transient in a limited range.

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Load-Following Strategies for Evolution of Solid Oxide Fuel Cells Into Model Citizens of the Grid

Auld

Samuelsen

Brouwer

et al. 2009

IEEE Trans. Energy Convers.

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Abstract-Proper converter design can allow solid oxide fuel cells operated as distributed generators to mutually benefit both the load and the electric utility during steady-state conditions, but dynamic load variations still present challenges. Unlike standard synchronous generators, fuel cells lack rotating inertia and their output power ramp rate is limited by design. Two strategies are herein investigated to mitigate the impact of a large load perturbation on the electric utility grid: 1) external use of ultracapacitor electrical storage connected through a dc-dc converter and 2) internal reduction of steady-state fuel utilization in the fuel cell to enable faster response to output power perturbations. Both strategies successfully eliminate the impact of a load perturbation on the utility grid. The external ultracapacitor strategy requires more capital investment while the internal fuel utilization strategy requires higher fuel use. This success implies that there is substantial flexibility for designing load-following fuel cell systems that are model citizens.

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Modelling of three-phase grid-connected inverters

Cited by 3 publications

References 8 publications

Research on the technology of ultra-long power supply in low voltage for tunnel construction

Research on the technology of ultra-long power supply in low voltage for tunnel construction

Load-Following Improvement of Fuel Cells with Fast Transient OCC Inverter

Load-Following Strategies for Evolution of Solid Oxide Fuel Cells Into Model Citizens of the Grid

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