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Demand response participation in wholesale energy markets

Demand response participation in wholesale energy markets

引用

IEEE General Meeting power& Energy Society

作者： Masood Parvania Mahmud Fotuhi-Firuzabad Mohammad Shahidehpour Center of Excellence in Power System Control and Management Electrical Engineering Department Sharif University of Technology Tehran Iran ECE Department Illinois Institute of Technology Chicago USA

This paper summarizes a presentation to be given at the IEEE power and Energy Society 2012 General Meeting, in the panel session “Demand response: analytics, practice, and challenges in smart grid environment”. The paper elaborates participation of demand response (DR) resources in electricity markets. Specially, different types of DR participation in the wholesale energy markets are discussed. Then, two DR program designs are presented which aim to enable customers' participation in day-ahead energy markets. The paper continues with presenting the modified structure of the day-ahead energy market in presence of the DR programs. The offer packages specifically designed for DR participation in the market are introduced, and the market clearing problems including DR programs are presented and discussed. In the last section, the paper outlines different benefits of DR participation in energy markets.

关键词： Electricity ISO Educational institutions Load management Electricity supply industry Smart grids electrical engineering

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Secondary control for compensation of voltage harmonics and unbalance in microgrids

Secondary control for compensation of voltage harmonics and ...

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2012 3rd IEEE International Symposium on power Electronics for Distributed Generation systems, PEDG 2012

作者： Savaghebi, Mehdi Vasquez, Juan C. Jalilian, Alireza Guerrero, Josep M. Electrical Engineering Department Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran 16846-13114 Iran Institute of Energy Technology Aalborg University Aalborg East DK-9220 Denmark

ISBN: (纸本)9781467320238

In this paper, a hierarchical control scheme is proposed for enhancement of Sensitive Load Bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises Distributed Generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental and harmonic components of load current among the DG units. The sharing improvement is provided at the expense of increasing voltage unbalance and harmonic distortion. Thus, the secondary control level is applied to manage the compensation of SLB voltage unbalance and harmonics by sending proper control signals to the primary level. DGs compensation efforts are controlled locally at the primary level. The system design procedure for selecting proper control parameters is discussed. Simulation results are provided in order to demonstrate the effectiveness of the proposed control scheme. © 2012 IEEE.

关键词： Quality control

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Stochastic unit commitment of wind farms based on mixed-integer linear formulation

Stochastic unit commitment of wind farms based on mixed-inte...

引用

Innovative Smart Grid Technologies (ISGT)

作者： Sh. Mostafa Esmaeeli A. Kazemi Center of Excellence for Power Systems Control and Operation Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

Due to uncertainty of wind velocity, wind power generators don't have deterministic output power. Utilizing wind power generation and thermal power plants together create new concerns for operation engineers of power systems. In this paper, a model is presented to implement the uncertainty of load and generated wind power which can be utilized in power system operation planning. Stochastic behavior of parameters is simulated by generating scenarios that can be solved by deterministic method. A mixed-integer linear programming method is used for solving deterministic generation scheduling problem. The proposed approach is applied to a 12-unit test system including 10 thermal units and 2 wind farms. The results show effectivity of piecewise linear model in unit commitment problems. Also using linear programming causes a considerable reduction in calculation times and guarantees convergence to the global optimum. Neglecting the uncertainty of wind velocity causes higher cost assessment of generation scheduling.

关键词： Wind speed Stochastic processes Uncertainty Wind farms Wind power generation Load modeling Cost function

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Online voltage control approach in smart distribution system with renewable distributed generation

Online voltage control approach in smart distribution system...

引用

Iranian Conference on Smart Grids (ICSG)

作者： Omid Homaee Alireza Zakariazadeh Shahram Jadid Center of Excellence for Power System Automation and Operation Department of Electrical Engineering Iran University of Science and Technology Tehran Iran Center for Urban Energy Ryerson University Toronto Canada

Voltage control is one of the imperative issues in the smart distribution grid control and operation procedure. While traditional distribution network is equipped with communication and monitoring equipments, the control voltage can be perfectly achieved. With using these smart gird technologies, the distribution voltage control schemes should operate intelligently and cover the effect of high penetration of distributed generation. In this paper, the new approach was proposed that improved the conventional voltage control models. The proposed approach needs measurement and communication equipments less than other methods as well as better covering the renewable distributed generation impact on Distribution network. The voltage control model was tested on typical distribution network. The results show that the proposed online voltage control model can stabilize voltage in permissible range in different consumer load fluctuation conditions and variable renewable generation levels.

关键词： Regulators

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Secondary control for compensation of voltage harmonics and unbalance in microgrids

Secondary control for compensation of voltage harmonics and ...

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IEEE International Symposium on power Electronics for Distributed Generation systems (PEDG)

作者： Mehdi Savaghebi Juan C. Vasquez Alireza Jalilian Josep M. Guerrero Electrical Engineering Department and Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran Iran Institute of Energy Technology Aalborg University Aalborg Denmark

关键词： Harmonic analysis Voltage control Impedance Harmonic distortion power harmonic filters Voltage measurement

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The Shuffled frog leaping algorithm for designing damping controller of UPFC

The Shuffled frog leaping algorithm for designing damping co...

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International Conference on Environment and electrical engineering (EEEIC)

作者： A. Ameli Sh. Bahrami A. Safari A. R. Vafaeimehr H. A. Shayanfar Electrical Engineering Department Iran University of Science and Technology Tehran Iran Tehran Iran Center of Excellence for Power System Automation and Operation Electrical Engineering Department Iran University of Science and Technology Tehran Iran Finance Department European Business School Wiesbaden Germany

The design of large interconnected power systems to ensure stable operation under wide variety of disturbances is a complicated problem. In recent years, technologically developments in Flexible AC Transmission systems or FACTS devices provided better performance in enhancing power system stability. This paper has provided a general description of Single machine infinite bus system (SMIB) small signal stability in case of using Unified power Flow controller (UPFC). In this study, the small signal stability of the system is converted to a multi-objective optimization problem which leads to design a controller of UPFC in order to make higher damping torque. The Shuffled frog leaping algorithm or SFLA is used as an optimization tool to find the optimum parameters of the controller. Furthermore, the designed controller is compared with similar ones using PSO and QPSO optimization approaches and in addition with a PSS controller to show the remarkable robustness and higher performance of the method.

关键词： power system stability Damping Algorithm design and analysis Stability analysis Circuit stability Oscillators Voltage control

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Selective Harmonic Virtual Impedance for Voltage Source Inverters with LCL filter in Microgrids

Selective Harmonic Virtual Impedance for Voltage Source Inve...

引用

IEEE Energy Conversion Congress and Exposition

作者： Mehdi Savaghebi Juan C. Vasquez Alireza Jalilian Josep M. Guerrero Tzung-Lin Lee Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Institute of Energy Technology Aalborg University Denmark Department of Electrical Engineering National Sun Yat-sen University Taiwan

ISBN: (纸本)9781467308021

This paper presents a new control approach for voltage source inverters ended with LCL filters for microgrid applications. The control approach consists of voltage and current inner control loops in order to fix the filter capacitor voltage and a virtual impedance loop. The virtual impedance is added in order to mitigate the voltage distortion after the output inductor and improve the load sharing among parallel inverters. A general case with a combined voltage harmonic and unbalance distortion is considered. In such a case, voltage distortion is mitigated by inserting capacitive virtual impedance for negative sequence of fundamental component as well as positive and negative sequences of main harmonic components. Furthermore, resistive virtual impedances are added at these components in order to provide a proper load sharing and make the overall system more damped. Simulation results are presented to demonstrate the effectiveness of the proposed control approach.

关键词： Virtual Impedance Voltage Source Inverters Microgrids

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Composite system well-being analysis using sequential Monte Carlo simulation and fuzzy algorithm

Composite system well-being analysis using sequential Monte ...

引用

7th International Conference on electrical and Electronics engineering, ELECO 2011

作者： Alinejad, Bahman Fotuhi-Firuzabad, Mahmud Parvania, Masood Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9786050102048

Health, Margin and Risk states which in recent years are known as well-being reliability indices, provide a comprehensive adequacy assessment of bulk power system reliability studies. Conventional reliability information about power system operation only considered health and risk states which were not often adequate criteria both in system planning and utilization. It seems margin state as the intermediate condition between health and risk must be considered. Well-being method which is a approach to power system generation adequacy evaluation incorporates deterministic criteria in a probabilistic framework and provides system operating information in addition to risk assessment and can be evaluated using analytical techniques. The most important part of this approach is the algorithm for calculating the probability of each state. Besides, all system components, their behavior and their operational conditions such as transmission lines overloads and voltage drops should be considered in the calculations. In this context, this paper proposes a method to calculate more precise well-being indices using Monte Carlo simulation procedure and Fuzzy Logic algorithm while AC load flow is utilized for contingency analysis. The proposed method is then demonstrated on the RBTS to demonstrate the instance results. © 2011 Chamber of Turkish Electric.

关键词： Health

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control of microgrids: Aspects and prospects

Control of microgrids: Aspects and prospects

引用

International Conference on Networking, Sensing and control

作者： Dobakhshari, A. Salehi Azizi, S. Ranjbar, A.M. Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9781424495702

A microgrid is a controllable component of the smart grid defined as a part of distribution network capable of supplying its own local load even in the case of disconnection from the upstream network. Microgrids incorporate large amount of renewable and non-renewable distributed generation (DG) that are connected to the system either directly or by power electronics (PE) interface. The diversity of technologies used in DGs and loads, high penetration of DGs, economic operation of DGs, dynamics of low-inertia conventional DGs and PE interfaced inertialess DGs and smart operation by means of enhanced communication infrastructure have raised challenges in widespread utilization of microgrids as basis of smart grids. power quality, protection, economic and secure operation, active management, communication, dynamics and control of microgrids are among the most important issues under research both in academy and industry. Technical concerns over dynamics of microgrids especially in autonomous (island) mode necessitate revision of current paradigms in control of energy systems. This paper addresses current challenges towards controlling microgrids and surveys dynamic modeling, stability and control of microgrids. Future trends in realizing smart grids through aggregation of microgrids and research needs in this path are discussed at the end of this paper. © 2011 IEEE.

关键词： Smart power grids

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Optimal RTU placement in power distribution systems using a novel method based on analytical hierarchical process (AHP)

Optimal RTU placement in power distribution systems using a ...

引用

International Conference on Environment and electrical engineering

作者： Dehghanian, Payman Kazemi, Ali Razi Fotuhi-Firuzabad, Mahmud Center of Excellence in Power System Management and Control Electrical Engineering Department Sharif University of Technology Tehran Iran

ISBN: (纸本)9781424487820

In a practical power system, automating all the substations is neither affordable nor economically justifiable. On the other hand, the trend for electric power subsidies elimination in some regions, such as Iran, aggravates this situation. To enhance the cost effectiveness of distribution automation system, this paper proposes a novel applicable qualitative-quantitative method using analytical hierarchical process (AHP) to find the optimum placement of remote terminal units (RTU). Entire attempt is to contribute all the crucial technical and practical parameters related to this problem in order to find the most reliable solution. Optimum number of RTUs is determined using the concepts of reliability cost/worth taking into account the total cost of customer interruption and investment cost of RTUs. The effectiveness of the proposed technique is validated on a real distribution feeder of Iran's power grid. © 2011 IEEE.

关键词： Cost effectiveness

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