Control of a Solid Oxide Fuel Cell Power Plant in a Grid-Connected System

Li, Y.H.; Rajakaruna, Sumedha; Choi, S.S.

doi:10.1109/tec.2005.853756

Cited by 100 publications

(78 citation statements)

References 26 publications

(51 reference statements)

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“…For this work, the utilization factor is taken as a constant value of 85% and the operating temperature is kept constant at 1273 K [26]. The parameters of the 100 kW SOFC power plant are obtained from [27].…”

Section: Sofc Modelmentioning

confidence: 99%

A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

et al. 2017

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Solar power generation is intermittent in nature. It is nearly impossible for a photovoltaic (PV) system to supply power continuously and consistently to a varying load. Operating a controllable source like a fuel cell in parallel with PV can be a solution to supply power to variable loads. In order to coordinate the power supply from fuel cells and PVs, a power management system needs to be designed for the microgrid system. This paper presents a power management system for a grid-connected PV and solid oxide fuel cell (SOFC), considering variation in the load and solar radiation. The objective of the proposed system is to minimize the power drawn from the grid and operate the SOFC within a specific power range. Since the PV is operated at the maximum power point, the power management involves the control of SOFC active power where a proportional and integral (PI) controller is used. The control parameters of the PI controller K p (proportional constant) and T i (integral time constant) are determined by the genetic algorithm (GA) and simplex method. In addition, a fuzzy logic controller is also developed to generate appropriate control parameters for the PI controller. The performance of the controllers is evaluated by minimizing the integral of time multiplied by absolute error (ITAE) criterion. Simulation results showed that the fuzzy-based PI controller outperforms the PI controller tuned by the GA and simplex method in managing the power from the hybrid source effectively under variations of load and solar radiation.

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Section: Sofc Modelmentioning

confidence: 99%

A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

et al. 2017

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“…The remaining "Control and Optimization Systems" parts are described in later sections. from the SOFC to the grid system is [27],…”

Section: Power Regulation Of a Grid-connected Sofcmentioning

confidence: 99%

“…Sendjaja and Kariwala [26] studied the use of decentralized proportional-integral-derivative (PID) controllers on the benchmark constant temperature SOFC dynamic model given in [21]. The same benchmark model was used in [27,28] to study the load tracking and small-signal stability issues pertaining to a grid-connected SOFC. As the stack temperature has been recognized to have significant impacts on the cell lifespan, some studies have improved the constant temperature model by including the energy balance equation.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Load Tracking Control of a Grid-Connected Solid Oxide Fuel Cell for Maximum Electrical Efficiency Operation

Zhu³

2015

Energies

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Based on the benchmark solid oxide fuel cell (SOFC) dynamic model for power system studies and the analysis of the SOFC operating conditions, the nonlinear programming (NLP) optimization method was used to determine the maximum electrical efficiency of the grid-connected SOFC subject to the constraints of fuel utilization factor, stack temperature and output active power. The optimal operating conditions of the grid-connected SOFC were obtained by solving the NLP problem considering the power consumed by the air compressor. With the optimal operating conditions of the SOFC for the maximum efficiency operation obtained at different active power output levels, a hierarchical load tracking control scheme for the grid-connected SOFC was proposed to realize the maximum electrical efficiency operation with the stack temperature bounded. The hierarchical control scheme consists of a fast active power control and a slower stack temperature control. The active power control was developed by using a decentralized control method. The efficiency of the proposed hierarchical control scheme was demonstrated by case studies using the benchmark SOFC dynamic model.

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“…Regarding fuel utilization, this parameter has been fixed by two limits: (1) model assumptions made for the developed dynamic model guarantee good results for u ≥ 0.65 [28]; (2) overused fuel-if u increases beyond a value (0.90), the cells may suffer from fuel starvation and become permanently damaged [47].…”

Section: Operating Point Analysismentioning

confidence: 99%

Operating Point Optimization of a Hydrogen Fueled Hybrid Solid Oxide Fuel Cell-Steam Turbine (SOFC-ST) Plant

2013

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This paper presents a hydrogen powered hybrid solid oxide fuel cell-steam turbine (SOFC-ST) system and studies its optimal operating conditions. This type of installation can be very appropriate to complement the intermittent generation of renewable energies, such as wind generation. A dynamic model of an alternative hybrid SOFC-ST configuration that is especially suited to work with hydrogen is developed. The proposed system recuperates the waste heat of the high temperature fuel cell, to feed a bottoming cycle (BC) based on a steam turbine (ST). In order to optimize the behavior and performance of the system, a two-level control structure is proposed. Two controllers have been implemented for the stack temperature and fuel utilization factor. An upper supervisor generates optimal set-points in order to reach a maximal hydrogen efficiency. The simulation results obtained show that the proposed system allows one to reach high efficiencies at rated power levels.

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Control of a Solid Oxide Fuel Cell Power Plant in a Grid-Connected System

Cited by 100 publications

References 26 publications

A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

A Fuzzy-Based PI Controller for Power Management of a Grid-Connected PV-SOFC Hybrid System

Hierarchical Load Tracking Control of a Grid-Connected Solid Oxide Fuel Cell for Maximum Electrical Efficiency Operation

Operating Point Optimization of a Hydrogen Fueled Hybrid Solid Oxide Fuel Cell-Steam Turbine (SOFC-ST) Plant

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