The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Power curve (PC) monitoring can be applied to evaluate the wind turbine generator (WTG) power output and detect deviations between the expected and the measured value, often a precursor of unexpected faults. In this research, the instantaneous SCADA data is used to show the fault forecast ability of Artificial Intelligence (AI) based PC monitoring of a pitch regulated WTG. The measured PCs illustrate...
The main objective of this study is to identify/determine the techno-economic and environmental merits of the inclusion of wind power to diesel power system for electricity generation in Nigeria. The optimum size of the wind-diesel micro-grid was determined by making energy-balance calculations using the Hybrid Optimization Model for Electric Renewable (HOMER) software. Analysis was performed for...
Along with the rapid development of wind power generation technology, numerous of wind generators will connect into distribution network. When the wind power is equivalent to a part of the comprehensive load of the distribution network, traditional load model is not appropriate for load characteristics any more. This paper raises a new method about generalized load model, which is to add an induction...
With wind power generators of hydraulic transmission type as the research object, the mathematical model of the fixed displacement pump-double variable displacement motors speed regulating system, the permanent magnet synchronous generator and wind turbine were established aiming at the actual situation of hydraulic component in speed regulation circuit. The mathematical model of fixed displacement...
The existing automatic lubrication system of the wind turbines is prone to producing the condition of less lubrication or over lubrication, which is very harmful to the bearing's work state and life period. In this thesis, a dynamic lubrication theory is brought forward. Based on practical operation condition, it can provide the necessary supply of bearing lubricating oil according to a scheme of...
In this paper, a nonlinear control method is proposed to improve the primary frequency control for doubly fed induction generator (DFIG) wind turbine system. Individual wind turbines in wind power plant are controlled in deloaded operation to provide the frequency support during depressed frequency conditions. By considering of nonlinearity of the system, input-output linearization method is applied...
This paper introduces two novel metrics to judge the capability and influence of wind power to provide virtual inertia response (i.e. frequency support). The first metric considers the generation unit (i.e. wind turbine generator (WTG)/wind farm (WF) vs. synchronous generator). This metric is applied to compare between three different methods of provision of frequency support. The second metric assess...
This paper presents comparative study of reduced order models (ROMs) of a doubly fed induction generators (DFIG) for normal operation. A DFIG with detailed mechanical, electrical and control components is the basis for model development. Two control strategies, the maximum power point tracking and set point tracking, are considered for normal operation. In these cases, the dynamic model of DFIG can...
In this paper, the load-frequency control problem of microgrid is discussed. The control is applied to maintain a balance between electric-power demand and supply by controlling the outputs of generators in power systems. However, because of the large-scale introduction of energy from renewable-energy sources, it has become more difficult to maintain this balance. To solve this problem, we consider...
The frequency regulation capability of a wind power plant plays an important role in enhancing frequency reliability especially in an isolated power system with high wind power penetration levels. A comparison of two types of inertial control methods, namely frequency-based inertial control (FBIC) and stepwise inertial control (SIC), is presented in this paper. Comprehensive case studies are carried...
The paper presents an analysis of the economical and technical impact of Water Network Loads (WNLs) on the operation of power systems. The paper also proposes an iterative technique to solve both a unit commitment problem with the inclusion of conventional power generation, wind power and WNLs and a N-1 contingency analysis based on time-domain simulations. At each iteration, if the WNLs schedule...
The penetration of renewable power generation in remote area power supply systems (RAPS) can be at a significant level, and the frequency support from renewable power generators is crucial to maintain the system stability under the imbalance between generation and load demand. However, the stochastic nature of renewable energy resources such as wind, and the power electronics based interface between...
This paper proposes optimal power dispatch considering wind and battery energy storage cost functions using Stochastic Weight Trade-off Particle Swarm Optimization (SWT-PSO). The objective is to minimize the total combined weighted operating cost of thermal, wind, battery and emission cost subject to power balance, thermal operating limits, ramp rate limits, prohibited operating zones, wind operating...
This paper investigates the most suitable location to place variable-speed wind generator based wind farms in a power system considering the steady-state voltage stability. The doubly-fed induction generator (DFIG) and the full-converter wind generator (FCWG) based wind generation is considered and the inherent reactive power capability of these generators are accurately represented in the study....
This paper proposes the utilization of a medium-speed synchronous reluctance generator together with IGBT-based three-level neutral-point-clamped converter for wind turbines. The finite element simulation of an optimized 2.0 MW synchronous reluctance generator is presented in order to extract the characteristics curves of the machine. Due to the medium voltage of the generator, the full-scale three-level...
The wind generation system treated in this paper is composed of a fixed pitch angle wind turbine followed by a Permanent Magnet Synchronous Generator (PMSG) and power electronic converters AC-DC-AC which are coupled to a DC link. This work deals with the control of the inverter in order to ensure a constant DC link voltage. The control design is based on Takagi Sugeno fuzzy model. Stability analysis...
Over the recent years, the large-scale development of offshore wind power in accordance with HVDC transmission has received extended attention. For the exploitation of such systems protection during onshore AC faults is of large importance. This paper examines an offshore transmission system consisting of two large wind parks, and two point-to-point HVDC links. A frequency droop control method applied...
the abundance of freely available wind energy comes with downside of being stochastic and inconsistent in nature. These properties are not particularly suited for a critically balanced system like electrical transmission grid. This work is primarily focused on assessing the effect of uncertain and stochastic nature of wind power on the stresses it imposes on transmission grid. This impact is studied...
A novel configuration of a compressed air assisted wind energy conversion system is proposed to capture the mechanical spillage of a wind turbine and store it as the compressed air. The compressed air storage could be used to supplement electric power generation. The compact design utilizes the surplus capacities of blades and generator, and combines the compressor and expander into one machine. The...
Hydraulic wind power transfer systems deliver the captured energy by the blades to the generators through an intermediate medium i.e. hydraulic fluid. This paper develops a control system for an experimental setup of hydraulic wind power transfer systems. To maintain a fixed frequency electrical voltage by the system, the generator should remain at a constant rotational speed regardless of the wind...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.