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Dynamic Modeling and Predictive Control in Solid Oxide Fuel Cells

First Principle and Data-based Approaches
1. Aufl.

von: Biao Huang, Yutong Qi, A. K. M. Monjur Murshed
105,99 €
Verlag:	Wiley
Format:	PDF
Veröffentl.:	12.12.2012
ISBN/EAN:	9781118501047
Sprache:	englisch
Anzahl Seiten:	352

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Beschreibungen

Titelbeschreibung

The high temperature solid oxide fuel cell (SOFC) is identified as one of the leading fuel cell technology contenders to capture the energy market in years to come. However, in order to operate as an efficient energy generating system, the SOFC requires an appropriate control system which in turn requires a detailed modelling of process dynamics. Introducting state-of-the-art dynamic modelling, estimation, and control of SOFC systems, this book presents original modelling methods and brand new results as developed by the authors. With comprehensive coverage and bringing together many aspects of SOFC technology, it considers dynamic modelling through first-principles and data-based approaches, and considers all aspects of control, including modelling, system identification, state estimation, conventional and advanced control. Key features: <ul> <li>Discusses both planar and tubular SOFC, and detailed and simplified dynamic modelling for SOFC</li> <li>Systematically describes single model and distributed models from cell level to system level</li> <li>Provides parameters for all models developed for easy reference and reproducing of the results</li> <li>All theories are illustrated through vivid fuel cell application examples, such as state-of-the-art unscented Kalman filter, model predictive control, and system identification techniques to SOFC systems</li> </ul> The tutorial approach makes it perfect for learning the fundamentals of chemical engineering, system identification, state estimation and process control. It is suitable for graduate students in chemical, mechanical, power, and electrical engineering, especially those in process control, process systems engineering, control systems, or fuel cells. It will also aid researchers who need a reminder of the basics as well as an overview of current techniques in the dynamic modelling and control of SOFC.

Inhaltsverzeichnis

Preface xi Acknowledgments xiii List of Figures xv List of Tables xxi 1 Introduction 1 1.1 Overview of Fuel Cell Technology 1 1.1.1 Types of Fuel Cells 2 1.1.2 Planar and Tubular Designs 3 1.1.3 Fuel Cell Systems 4 1.1.4 Pros and Cons of Fuel Cells 5 1.2 Modelling, State Estimation and Control 5 1.3 Book Coverage 6 1.4 Book Outline 6 Part I Fundamentals 2 First Principle Modelling for Chemical Processes 11 2.1 Thermodynamics 11 2.1.1 Forms of Energy 11 2.1.2 First Law 12 2.1.3 Second Law 13 2.2 Heat Transfer 13 2.2.1 Conduction 14 2.2.2 Convection 15 2.2.3 Radiation 17 2.3 Mass Transfer 18 2.4 Fluid Mechanics 20 2.4.1 Viscous Flow 21 2.4.2 Velocity Distribution 21 2.4.3 Bernoulli Equation 21 2.5 Equations of Change 22 2.5.1 The Equation of Continuity 23 2.5.2 The Equation of Motion 23 2.5.3 The Equation of Energy 24 2.5.4 The Equations of Continuity of Species 26 2.6 Chemical Reaction 26 2.6.1 Reaction Rate 26 2.6.2 Reversible Reaction 28 2.6.3 Heat of Reaction 29 2.7 Notes and References 29 3 System Identification I 31 3.1 Discrete-time Systems 31 3.2 Signals 36 3.2.1 Input Signals 36 3.2.2 Spectral Characteristics of Signals 41 3.2.3 Persistent Excitation in Input Signals 44 3.2.4 Input Design 49 3.3 Models 50 3.3.1 Linear Models 50 3.3.2 Nonlinear Models 54 3.4 Notes and References 56 4 System Identification II 57 4.1 Regression Analysis 57 4.1.1 Autoregressive Moving Average with Exogenous Input Models 57 4.1.2 Linear Regression 59 4.1.3 Analysis of Linear Regression 60 4.1.4 Weighted Least Squares Method 61 4.2 Prediction Error Method 64 4.2.1 Optimal Prediction 65 4.2.2 Prediction Error Method 70 4.2.3 Prediction Error Method with Independent Parameterisation 74 4.2.4 Asymptotic Variance Property of PEM 75 4.2.5 Nonlinear Identification 76 4.3 Model Validation 79 4.3.1 Model Structure Selection 79 4.3.2 The Parsimony Principle 80 4.3.3 Comparison of Model Structures 81 4.4 Practical Consideration 82 4.4.1 Treating Non-zero Means 82 4.4.2 Treating Drifts in Disturbances 83 4.4.3 Robustness 83 4.4.4 Additional Model Validation 83 4.5 Closed-loop Identification 84 4.5.1 Direct Closed-loop Identification 85 4.5.2 Indirect Closed-loop Identification 87 4.6 Subspace Identification 92 4.6.1 Notations 92 4.6.2 Subspace Identification via Regression Analysis Approach 97 4.6.3 Example 100 4.7 Notes and References 102 5 State Estimation 103 5.1 Recent Developments in Filtering Techniques for Stochastic Dynamic Systems 103 5.2 Problem Formulation 105 5.3 Sequential Bayesian Inference for State Estimation 107 5.3.1 Kalman Filter and Extended Kalman Filter 110 5.3.2 Unscented Kalman Filter 112 5.4 Examples 116 5.5 Notes and References 120 6 Model Predictive Control 121 6.1 Model Predictive Control: State-of-the-Art 121 6.2 General Principle 122 6.2.1 Models for MPC 122 6.2.2 Free and Forced Response 125 6.2.3 Objective Function 125 6.2.4 Constraints 126 6.2.5 MPC Law 126 6.3 Dynamic Matrix Control 127 6.3.1 Prediction 127 6.3.2 DMC without Penalising Control Moves 129 6.3.3 DMC with Penalising Control Moves 130 6.3.4 Feedback in DMC 130 6.4 Nonlinear MPC 134 6.5 General Tuning Guideline of Nonlinear MPC 136 6.6 Discretisation of Models: Orthogonal Collocation Method 137 6.6.1 Orthogonal Collocation Method with Prediction Horizon 1 137 6.6.2 Orthogonal Collocation Method with Prediction Horizon N 140 6.7 Pros and Cons of MPC 142 6.8 Optimisation 142 6.9 Example: Chaotic System 144 6.10 Notes and References 145 Part II Tubular SOFC 7 Dynamic Modelling of Tubular SOFC: First-Principle Approach 149 7.1 SOFC Stack Design 149 7.2 Conversion Process 150 7.2.1 Electrochemical Reactions 150 7.2.2 Electrical Dynamics 153 7.3 Diffusion Dynamics 155 7.3.1 Transfer Function of Diffusion 156 7.3.2 Simplified Transfer Function of Diffusion 157 7.3.3 Dynamic Model of Diffusion 158 7.3.4 Diffusion Coefficient 159 7.4 Fuel Feeding Process 160 7.4.1 Reforming/Shift Reaction 160 7.4.2 Mass Transport 162 7.4.3 Momentum Transfer 164 7.4.4 Energy Transfer and Heat Exchange 165 7.5 Air Feeding Process 166 7.5.1 Mass Transport in the Cathode Channel 166 7.5.2 Cathode Channel Momentum Transfer 167 7.5.3 Energy Transfer in the Cathode Channel 168 7.5.4 Air in Injection Channel 168 7.6 SOFC Temperature 169 7.6.1 Dynamic Energy Exchange Process 169 7.6.2 Conduction 170 7.6.3 Convection 171 7.6.4 Radiation 172 7.6.5 Cell Temperature Model 174 7.6.6 Injection Tube Temperature Model 174 7.7 Final Dynamic Model 175 7.7.1 I/O Variables 175 7.7.2 State Space Model 176 7.7.3 Model Validation 180 7.8 Investigation of Dynamic Properties through Simulations 181 7.8.1 Dynamics of Diffusion 182 7.8.2 Dynamics of Fuel Feeding Process 184 7.8.3 Dynamics of Air Feeding Process 186 7.8.4 Dynamics due to External Load 188 7.9 Notes and References 190 8 Dynamic Modelling of Tubular SOFC: Simplified First-Principle Approach 193 8.1 Preliminary 193 8.1.1 Relation of Process Variables 194 8.1.2 Limits to Power Output 194 8.2 Low-order State Space Modelling of SOFC Stack 195 8.2.1 Physical Processes 195 8.2.2 Modelling Assumptions 197 8.2.3 I/O Variables 197 8.2.4 Voltage 198 8.2.5 Partial Pressures 199 8.2.6 Flow Rates 200 8.2.7 Temperatures 203 8.3 Nonlinear State Space Model 204 8.4 Simulation 205 8.4.1 Validation 205 8.4.2 Step Response to the Inputs 207 8.4.3 Step Responses to the Disturbances 209 8.5 Notes and References 211 9 Dynamic Modelling and Control of Tubular SOFC: System Identification Approach 213 9.1 Introduction 213 9.2 System Identification 213 9.2.1 Selection of Variables 213 9.2.2 Step Response Test 214 9.2.3 Non-typical Step Response 217 9.2.4 Input Design 218 9.2.5 Linear System Identification 220 9.2.6 Nonlinear System Identification 234 9.3 PID Control 241 9.3.1 Set Point Tracking 243 9.3.2 Disturbance Rejection 243 9.3.3 Internal Model Control for Discrete-time Processes 243 9.3.4 Application of Discrete-time IMC to Multi-loop Control of SOFC 254 9.4 Closed-loop Identification 257 9.5 Notes and References 263 Part III Planar SOFC 10 Dynamic Modelling of Planar SOFC: First-Principle Approach 267 10.1 Introduction 267 10.2 Geometry 268 10.3 Stack Voltage 268 10.4 Mass Balance 270 10.5 Energy Balance 271 10.5.1 Lumped Model 272 10.5.2 Detail Model 273 10.6 Simulation 277 10.6.1 Steady-state Response 277 10.6.2 Dynamic Response 278 10.7 Notes and References 280 11 Dynamic Modelling of Planar SOFC System 283 11.1 Introduction 283 11.2 Fuel Cell System 283 11.2.1 Fuel and Air Heat Exchangers 284 11.2.2 Reformer 286 11.2.3 Burner 287 11.3 SOFC along with a Capacitor 287 11.4 Simulation Result 289 11.4.1 Fuel Cell System Simulation 290 11.4.2 SOFC Stack with Ultra-capacitor 292 11.5 Notes and References 292 12 Model Predictive Control of Planar SOFC System 295 12.1 Introduction 295 12.2 Control Objective 296 12.3 State Estimation: UKF 297 12.4 Steady-state Economic Optimisation 298 12.5 Control and Simulation 301 12.5.1 Linear MPC 301 12.5.2 Nonlinear MPC 303 12.5.3 Optimisation 305 12.6 Results and Discussions 306 12.7 Notes and References 307 Appendix A Properties and Parameters 309 A.1 Parameters 309 A.2 Gas Properties 309 References 315 Index 321