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Search Results: 1 - 10 of 4361 matches for " grid side controller "
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Application of STATCOM and CROWBAR for Transient Stability Improvement and Performance Enhancement for A Wind Turbine Based Doubly Fed Induction Generator
CH.AppalaNarayana,D.V.N.Ananth,S. Saikiran,I. Prasanna Kumar
International Journal of Soft Computing & Engineering , 2013,
Abstract: This paper presents a robust control of Doubly FedInduction Generator (DFIG) wind turbine in a sample powersystem. DFIG consists of a common induction generator with slipring and a partial scale power electronic converter. Indirect fieldorientedcontroller is applied to rotor side converter for activepower control and voltage regulation of wind turbine. On gridside PQ control scheme is applied. Wind turbine and its controlunits are described in details and also for STATCOM control. Allpower system components are simulated in MATLAB/SIMULINK software. For studying the performance ofcontroller, different abnormal conditions are applied even theworst case. Simulation results prove that the performance ofSTATCOM and DFIG control schemes as improving powerquality and stability of wind turbine.
International Journal of Engineering Science and Technology , 2013,
Abstract: In this research paper provided the information about low-voltage ride-through (LVRT) scheme for the permanent magnet synchronous generator (PMSG), and wind energy conversion system. The dc-link voltage is uncomfortable by the generator side converter instead of the grid-side converter (GSC). Considering the nonlinear correlation between the generator speed (ωm) and the dc-link voltage (Vdc), a dc-link Voltage controller is anticipated using a hysteresis current controller. Among all, low-voltage ride-through has been fundamental in the field, which is one of the most important challenges for wind energy conversion system. It is essential to design an included controller to protect the converter from overvoltage/overcurrent and to support the grid voltage during faults and recoveries. A unified dc-link voltage control scheme and hysteresis current controller based wind energy conversion system is proposed. The controllers for grid-side converters are coordinated to provide fault ride-through capability. The generator side is forced by space vector modulationand grid side implemented hysteresis current controller. The Grid Side Controller controls the grid active power and maximum power deliver to the grid. The ability of this control algorithm has been confirmed by simulation results.
A Research of Real-Time Pricing Mechanism and Its Characteristics  [PDF]
Yichao Dong, Bin Zou
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34033

Real-Time Pricing (RTP) is proposed as an effective Demand-Side Management (DSM) to adjust the load curve in order to achieve the peak load shifting. At the same time, the RTP mechanism can also raise the revenue of the supply-side and reduce the electricity expenses of consumers to achieve a win-win situation. In this paper, a real-time pricing algorithm based on price elasticity theory is proposed to analyze the energy consumption and the response of the consumers in smart grid structure. We consider a smart grid equipped with smart meters and two-way communication system. By using real data to simulate the proposed model, some characteristics of RTP are summarized as follows: 1) Under the condition of the real data, the adjustment of load curve and reducing the expenses of consumers is obviously. But the profit of power supplier is difficult to ensure. If we balance the profits of both sides, the supplier and consumers, the profits of both sides and the adjustment of load curve will be relatively limited. 2) If assuming the response degree of consumers to real-time prices is high enough, the RTP mechanism can achieve the expected effect. 3, If the cost of supply-side (day-ahead price) fluctuates dramatically, the profits of both sides can be ensured to achieve the expected effect.

Micro-Grid Smooth Switchover Method Based on Controller State Following  [PDF]
Yang Fu, Lisha Huang, Jingjing Zhao
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34019

Micro-grid smooth switchover between different operation modes is important for steady operation and reliable power supply of micro-grid. In order to reduce the transient fluctuation of voltage and frequency during switchover, this paper proposed a new switchover method based on controller state following. When transferring to island mode, the control method for inverter of storage device changed from PQ control to V/f control. Before switchover, the output of V/f controller is always following the output of PQ controller. So that the sudden change of output is avoided at the moment of switchover. A micro-grid model with photovoltaic and battery is built on DIgSILENT Power Factory simulation software, to simulate micro-grid switchover from grid-connected mode to island mode. Results show this method can effectively suppress the transient fluctuation of voltage and frequency, and reduce the influence of transient process on power grid. This conclusion has important practical significance on micro-grid smooth switchover from grid-con- nected mode to island mode.

Smart Grid, Smart Controllers and Home Energy Automation—Creating the Infrastructure for Future  [PDF]
Abhishek Khanna
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.33024
Abstract: Integration of unpredictable renewable power sources into the Grid is leading to the development of wide area control algorithms and smart grid. Smart meters are the first step in the building a smart consumer interface. Much more, however, would be required in building a smart grid than just smart meters. This paper explores the conceptual architecture of smart grid. It highlights the need for additional infrastructure to realize full potential of smart grid. The information presented in this paper is an attempt to uncover what the future in smart grid could be and what infrastructure would be required to tap its potential. As smart grid evolves, more functionality would be built in the constituents. The paper also proposes mathematical basis for some of the controller algorithms.
Trends and Overview Regarding the Involvement of Micro-Grids in Modern Power Systems  [PDF]
Muhammad Ali, Hafeez ur Rahman, Waheed ur Rahman, Haseeb ur Rahman
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.32012
Abstract: Customer satisfaction and participation in utility supply packages is the first and foremost factor in the success of any supplying agency whether wholesale or retail dealer. The paper presents the concept of major prospects of non- autonomous micro-grids installed in a certain locality. The article shows the basic background that is required for the installment of micro grid in a particular area and discusses the primary factors or pre-requisites that are required for the existence and operation of micro-grids. It elaborate the major profitable applications and benefits that developing and developed states get by using micro-grids in an area where utility grid is already functioning .It also explains the basic improvement in the quality of supply from micro grid after its installment. It also throws light on afterwards impact on society with this system, such impacts include reliability, tariff rates, economics etc. The article discusses micro-grids as the future of modern power systems. This paper shows significance of modernization by latest topologies in power systems and its effect that will come afterwards.
Optimal Demand-Side Management for Smart Micro Grid with Storage  [PDF]
Hugor Ininahazwe, Christopher Maina Muriithi, Stanley Kamau
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.62004
Abstract: In this paper, an autonomous and distributive demand-side management based on Bayesian game theory is developed and applied among users in a grid connected micro-grid with storage. To derive that strategy, an energy consumption of shiftable loads belonging to a given user is modelled as a noncooperative three-player game of incomplete information, in which each user plays against the storage unit and an opponent gathering all the other users in the micro-grid. Each player is assumed to be endowed with statistical information about its behavior and that of its opponents so that he can take actions maximizing his expected utility. Results of the proposed strategy evaluated by simulating, under MATLAB environment, a connected micro-grid with storage device evidence its efficacy when employed to manage the charging of electric vehicles.
International Journal of Engineering Science and Technology , 2010,
Abstract: This paper demonstrates the implementation of a prototype of IPS (instant power supply) system to ensure continuous output current to load in residential application utilizing both Photovoltaic (PV) energy and AC Grid. Utility interfacing PWM inverter designed here to operate by both solar energy and storage batteries that highly satisfies the necessity in rural areas where National Grids are hardly available and power cut problem reduces the effectiveness of IPS. Solar energy gets priority here to charge storage battery rather than AC source that may save hundreds of mega watts power every day. To extend the battery lifetime and keep system components hazard-free, it includes exact battery-level sensing, charging- urrent controlling by microcontroller unit (MCU) and a cumulative DC/AC MPPT (Maximum Power Point Tracking) charging to congregatemaximum PV energy from AC Solar Modules. Investigation on improvement of power-interfacing control and optimization of overall system operation assent to intend usage recommendation in this exposition. Computer simulations and experiment results show the validity of this proposed system to have high power conversion efficiency and low harmonic distortions.
Control System Development and Test for the Operation of a Micro-Grid System—PART II  [PDF]
Razzaqul Ahshan, Mohammad Tariq Iqbal, George K. I. Mann, John E. Quaicoe
Smart Grid and Renewable Energy (SGRE) , 2014, DOI: 10.4236/sgre.2014.512027
Abstract: This paper presents experimental development and performance testing of an active power controller for stable and reliable operation of a micro-grid system. In order to achieve accurate and fast power balance in a micro-grid system that contains renewable energy sources, power in the system has to be regulated continuously. Such an objective can be achieved using droop based alternating current control technique. Because the droop characteristic employed into the developed controller initiates to determine the power deviation in the system which is continuously regulated by controlling the current flow into dump power resistors. The designed controller is tested and validated using a micro-grid prototype in the laboratory environment for stand-alone mode of operation under various operating conditions. The key development in the micro-grid prototype is the development of a wind turbine simulator. A dSPACE ds1104 DSP board is used to implement and interface the designed controller with the micro-grid system. The experimental investigation of the developed controller presents the significant capability to achieve continuous power balance in the micro-grid system, while it maintains stable and reliable operation of the system. Finally, the power quality of the isolated micro-grid system is presented and discussed under the operation of the developed controller.
Managing of Smart Micro-Grid Connected Scheme Using Group Search Optimization  [PDF]
S. Bhagawath, S. Edward Rajan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.710263
Abstract: This article introduces a group search optimization (GSO) based tuning model for modelling and managing Smart Micro-Grids connected system. In existing systems, typically tuned PID controllers are engaged to point out the load frequency control (LFC) problems through different tuning techniques. Though, inappropriately tuned PID controller may reveal pitiable dynamical reply and also incorrect option of integral gain may even undermine the complete system. This research isused to explain about an optimized energy management system through Group Search Optimization (GSO) for building incorporation in smart micro-grids (MGs) with zero grid-impact.The essential for this technique is to develop the MG effectiveness, when the complete PI controller requires to be tuned. Consequently, we proposed that the proposed GSO based algorithmwith appropriate explanation or member representation, derivation of fitness function, producer process,scrounger process, and ranger process. An entire and adaptable design of MATLAB/SIMULINK also proposed. The related solutions and practical test verifications are given. This paper verified that the proposed method was effective in Micro-Grid (MG) applications. The comparison results demonstrate the advantage of the proposed technique and confirm its potential to solve the problem.
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