Modeling and frequency control of community micro-grids under stochastic solar and wind sources

Abstract The Community Micro-Grid (CMG) is a coordinated local grid area served by one or more distribution substations supported by local renewable and other distributed energy resources (DER). In an islanded mode, the CMG stability reduces due to low inertia of the equivalent system and stochastic nature of renewable energy sources (RESs). To study the frequency stability of the islanded CMG system, this paper explores the mathematical modeling aspects of different sources in the CMG and the robust control design for the community microgrid model. The robust design using a fixed structure H ∞ synthesis method has been presented to compensate for the effect of modeling uncertainty. The uncertainty in the CMG model results in parametric perturbation which degrades its performance and stability. This paper explores the existing mathematical models of CMG’s and different control techniques applied for frequency regulation. Robust controller design for CMG is proposed that can handle the stochastic input disturbances like a sudden change in power coming from solar and wind sources and also the model uncertainty that results in the parametric perturbations. The complete model is simulated using MATLAB Simulink platform and results of frequency deviation obtained by robust and PID controller are compared. The controller hardware in loop (C-HIL) validation of the robust control method for CMG has been done using a real-time controller board (DS1104). This CHIL system also implements the CMG plant-controller model and analyzes the frequency deviation against load and renewable power fluctuations. The oscillations in frequency deviation are analyzed for sudden rise or fall in the renewable power coming from the solar and wind sources. A reduction of 30% is achieved in frequency overshoot and settling time using a robust controller than the PID controller. The controller developed and implemented using H ∞ synthesis has robust stability and performance for the perturbed CMG model and also shows a better time response, unlike the PID controller.

[1]  K. V. Vidyanandan.  Frequency regulation in microgrid using wind — Fuel cell — Diesel generator , 2012, 2012 IEEE Power and Energy Society General Meeting.

[2]  Filipe Joel Soares,et al.  Electric vehicles contribution for frequency control with inertial emulation , 2015 .

[3]  Om P. Malik,et al.  An adaptive control scheme for speed control of diesel driven power-plants , 1991 .

[4]  Perry Y. Li,et al.  Control oriented modeling and system identification of a diesel generator set (genset) , 2010, Proceedings of the 2010 American Control Conference.

[5]  Soo-Bin Han,et al.  Frequency control in micro-grid power system combined with electrolyzer system and fuzzy PI controller , 2008 .

[6]  S. Surender Reddy,et al.  Optimal scheduling of thermal-wind-solar power system with storage , 2017 .

[7]  G. F. Reed,et al.  Survey of battery energy storage systems and modeling techniques , 2012, 2012 IEEE Power and Energy Society General Meeting.

[8]  Zhenzhen Zhang,et al.  A Wind Power and Load Prediction Based Frequency Control Approach for Wind-Diesel-Battery Hybrid Power System , 2015 .

[9]  P. R. Pathapati,et al.  A new dynamic model for predicting transient phenomena in a PEM fuel cell system , 2005 .

[10]  Shin'ya Obara,et al.  Analysis of a fuel cell micro-grid with a small-scale wind turbine generator , 2007 .

[11]  Caisheng Wang,et al.  Modeling of Microturbine Power Generation Systems , 2006 .

[12]  Ji Feng,et al.  Controller design of flywheel energy storage systems in microgrid , 2014, 2014 17th International Conference on Electrical Machines and Systems (ICEMS).

[13]  S. Surender Reddy,et al.  Optimization of Renewable Energy Resources in Hybrid Energy Systems , 2017 .

[14]  Wei Wei,et al.  Describing Function Method Based Power Oscillation Analysis of LCL-Filtered Single-Stage PV Generators Connected to Weak Grid , 2019, IEEE Transactions on Power Electronics.

[15]  Xiang Zhang,et al.  A DC-Link Voltage Fast Control Strategy for High-Speed PMSM/G in Flywheel Energy Storage System , 2018 .

[16]  Yonggang Peng,et al.  Different Influence of Grid Impedance on Low- and High-Frequency Stability of PV Generators , 2019, IEEE Transactions on Industrial Electronics.

[17]  P. W. Lehn,et al.  A micro-turbine model for system studies incorporating validated thermodynamic data , 2011, 2011 IEEE Power and Energy Society General Meeting.

[18]  Alaa M. Abdel-hamed,et al.  Optimized Control Scheme for Frequency/Power Regulation of Microgrid for Fault Tolerant Operation , 2016 .

[19]  Anjan Bose,et al.  Stability Simulation Of Wind Turbine Systems , 1983, IEEE Transactions on Power Apparatus and Systems.

[20]  T. Funabashi,et al.  A hybrid power system using alternative energy facilities in isolated island , 2005, IEEE Transactions on Energy Conversion.

[21]  P. R. Bijwe,et al.  Real time economic dispatch considering renewable energy resources , 2015 .

[22]  A. R. Abhyankar,et al.  Market clearing for a wind-thermal power system incorporating wind generation and load forecast uncertainties , 2012, 2012 IEEE Power and Energy Society General Meeting.

[23]  Hossein Shayeghi,et al.  Reinforcement learning based PID controller design for LFC in a microgrid , 2017 .

[24]  Frede Blaabjerg,et al.  A robust adaptive load frequency control for micro-grids. , 2016, ISA transactions.

[25]  K. E. Yeager,et al.  Modeling of emergency diesel generators in an 800 megawatt nuclear power plant , 1993 .

[26]  S. Mishra,et al.  Automatic generation control of microgrid using artificial intelligence techniques , 2012, 2012 IEEE Power and Energy Society General Meeting.

[27]  Le Luo,et al.  The Control and Modeling of Diesel Generator Set in Electric Propulsion Ship , 2011 .

[28]  Li Wang,et al.  Small-Signal Stability Analysis of an Autonomous Hybrid Renewable Energy Power Generation/Energy Storage System Part I: Time-Domain Simulations , 2008, IEEE Transactions on Energy Conversion.

[29]  Chen Hao,et al.  Application and modeling of battery energy storage in power systems , 2016 .

[30]  Yusuf Al-Turki,et al.  Hierarchical Coordination of a Community Microgrid With AC and DC Microgrids , 2015, IEEE Transactions on Smart Grid.

[31]  Yasunori Mitani,et al.  Intelligent Frequency Control in an AC Microgrid: Online PSO-Based Fuzzy Tuning Approach , 2012, IEEE Transactions on Smart Grid.

[32]  Dr. Inmaculada Zamora,et al.  International Journal of Emerging Electric Power Systems Emergent Technologies In Electrical , 2011 .

[33]  Weijia Yuan,et al.  A Novel use of the Hybrid Energy Storage System for Primary Frequency Control in a Microgrid , 2016 .

[34]  Abdullah Abusorrah,et al.  Optimal Interconnection Planning of Community Microgrids With Renewable Energy Sources , 2017, IEEE Transactions on Smart Grid.

[35]  Sukumar Mishra,et al.  Design of controller and communication for frequency regulation of a smart microgrid , 2012 .

[36]  S. Surender Reddy,et al.  Review of stochastic optimization methods for smart grid , 2017 .

[37]  Željko Ban,et al.  Linear Model of PEM Fuel Cell Power System for Controller Design Purposes , 2007 .

[38]  Sukumar Mishra,et al.  Storage Free Smart Energy Management for Frequency Control in a Diesel-PV-Fuel Cell-Based Hybrid AC Microgrid , 2016, IEEE Transactions on Neural Networks and Learning Systems.

[39]  N. Senthil Kumar,et al.  Development of hybrid microgrid model for frequency stabilization , 2017 .

[40]  Ramesh C. Bansal,et al.  A Novel Methodological Framework for the Design of Sustainable Rural Microgrid for Developing Nations , 2018, IEEE Access.

[41]  Luciane Neves Canha,et al.  An electrochemical-based fuel-cell model suitable for electrical engineering automation approach , 2004, IEEE Transactions on Industrial Electronics.

[42]  Makbul A.M. Ramli,et al.  Economic analysis of PV/diesel hybrid system with flywheel energy storage , 2015 .

[43]  Rafael Pena-Alzola,et al.  Control and simulation of a flywheel energy storage for a wind diesel power system , 2015 .

[44]  S.S. Choi,et al.  An analysis of the control and operation of a solid oxide fuel-cell power plant in an isolated system , 2005, IEEE Transactions on Energy Conversion.

[45]  Anna G. Stefanopoulou,et al.  Control of Fuel Cell Power Systems: Principles, Modeling, Analysis and Feedback Design , 2004 .

[46]  Hassan Bevrani,et al.  Robust Frequency Control in an Islanded Microgrid: H∞ and μ-Synthesis Approaches , 2016, IEEE Trans. Smart Grid.

[47]  A. N. Jha,et al.  Ziegler-Nichols based controller parameters tuning for load frequency control in a microgrid , 2011, 2011 International Conference on Energy, Automation and Signal.