Large Wind Power Generation Research Articles

Optimal Efficiency Control of Wind Mill Induction Generator Using Loss Minimization Technique

Improvement of the operating efficiency of generators used in large wind power generation systems becomes important since such a large machine's power loss is not negligible. In the conventional method integral controller is used to reduce the power loss by up to 25 % at low wind speeds. The proposed PID controller method is based on flux level reduction, where the flux level is computed from the machine model for the optimum d-axis current of the generator. For the vector-controlled induction generator, the d-axis current controls the excitation level to minimize generator loss. In contrast, the q-axis current controls the generator torque, by which the speed of the induction generator is controlled according to the variation of the wind speed in order to produce the maximum output power, thereby improve the efficiency of the induction generator.

Economic analysis of distribution network planning considering decentralized energy storage system

The rapid development of renewable energy makes the power grid gradually change from traditional power system to high proportion renewable energy power system. The rapid development of electric vehicles, energy storage and controllable load increases the uncertainty of load. The flexible adjustable load is less, which can not meet the consumption demand of large wind and solar power generation, and can not support the power valley filling demand when the wind power output is insufficient. Energy storage system is very important for the safe and stable operation of renewable energy internet. How to consider the reliability and economy, this paper proposes a distribution network planning scheme considering energy storage system.

대용량 풍력에너지의 계통 연계시 전압변동을 고려한 그룹 구성에 관한 연구

A number of countries around the world have the goal to enhance the ratio of renewable energy and Korea is one of them. When the large capacity renewable energy is installed, it is intensely installed in one complex, and in order to obtain the effective ingredient of the maximum power generation, it operates as close to the power factor 1. The single group operation of the large capacity wind power generator greatly changes the voltage (V) of the inverter terminal connected to the wind power generator regardless of the reactive power. Over-voltage frequently occurs with the case of generating insulation destruction of inverter facility with the voltage change. In particular, if the semiconductor of the inverter is current-type element, it may be even more vulnerable to the over-voltage. In this paper, it analyzes the facility response related to the supply and absorption of reactive power in the relationship with the electrical power system to be connected for the over-voltage arising when installing the large capacity wind power energy, and it intends to compare and analyze the effect on the power conversion equipment and scope of voltage change following the installation type under the renewable energy source’s design.

Clustering based unit commitment with wind power uncertainty

Wind power generation is continuously increasing around the world, but due to uncertainty in wind power generation, the unit commitment problem has become complex. In this paper, scenario generation and reduction techniques are used to consider wind power uncertainty on system operation. Also, a new approach is developed for creating clusters of unit status associated with a probability of occurrence from an initial set of large wind power generation scenarios. And then a model of wind-hydro-thermal coordination problem along with the pumped storage plant is established. Combination of proposed weighted-improved crazy particle swarm optimization along with a pseudo code based algorithm and scenario analysis method is utilized to solve above problem. The effectiveness and feasibility of the proposed method is tested on systems with and without pumped storage plant integration. The results are analyzed in detail, which demonstrate the model and the proposed method is practicable in solving the unit commitment.

Power quality analysis for the distribution systems with a wind power generation system

This paper investigates the impacts of a large wind power generation system (WPGS) on the distribution system. The installation of various types of distributed generators (DGs) on the distribution system will significantly affect the operating, planning and maintaining strategies of the utility. In this paper, one practical distribution system of Taiwan Power Company (Taipower) is selected for study. Various power quality issues like steady state voltage variation ratio, reverse power, flicker, short-circuit current as well as harmonic are investigated and calculated by applying the computer program simulation and the simplified calculation methods suggested by the International Electrotechnical Commission (IEC). The results will be compared with the Taipower relative standards to demonstrate the feasibility of the WPGS to be installed in the distribution feeder.

Key Technology of LCA on Small Wind Power Generation System

Many domestic and international scholars carried on LCA method research to wind power generation system, but generally focused on the large megawatt wind power generation system rather than SWPGS Small Wind Power Generation Systems (power rating less than 1kw).The different structural between large wind turbine and small wind turbine led to the different system boundaries and evaluation models in LCA. So this paper puts forward to establish LCA database based on Geographical Information System (GIS) and establish evaluation model based on Agent-based Modeling (ABM) method, which can provide references for LCA direction of the further deeper follow-up research.

An operating condition fuzzy assessment strategy for large scale doubly-fed wind power generation system

Timely and accurate assessment of wind turbine operating condition can save the maintenance cost effectively, because equipment repair and replacement for large wind turbine are expensive. Therefore, an efficient operating condition assessment strategy for wind turbine is proposed based on fuzzy synthesis method. First, the traditional fuzzy assessment process is introduced briefly a foundation for comparison. Second, a wind turbine assessment model is established and assessed in detail, with an improved fuzzy prediction strategy and de-fuzzy strategy. Finally, a comparison between the improved strategy and the traditional strategy is studied based on wind turbine operation data, and the results validate that the strategy proposed in this paper can alarm operation fault more promptly and efficiently, which is better for wind turbine operation safety and maintenance.

Study of Large Wind Power Generator with Evaporative Cooling System

Study of Large Wind Power Generator with Evaporative Cooling System

Wind Power Generation System Optimal Control Based on Vector Control of Squirrel-Cage Induction Generator

As the squirrel-cage induction generator (SCIG) system have been applied for wind power generation system (WPGS) for long time, the research for its control will enhance the control performance and instructive for another relative wind power system. The large power wind power generation system was constructed based on SCIG with vector control, the system was decoupled with rotor flux loop torque loop. the mathematical models of wind turbine subsystem, drive train subsystem, and SCIG subsystem was created respectively. the SCIG model and vector control strategy was taken with MATLAB S-function, the torque control loop, speed control loop, power control loop and the optimal control system was integrated at last, the simulation result shows this control system can realize optimal control for large wind energy conversion system which can effectively applied into SCIG wind power generation system for system modification.

Structure Optimization of Air Cooling Condenser in Close-Loop Self-Circulation Evaporative Cooling System of Wind Generator

Being a widely used clean and renewable energy, the wind power has attracted the attention of all nations in the world. The application of air cooled close-loop self-circulation evaporative cooling technology in the cooling of large wind power generator is a new attempt in the discovery of wind power energy. The structure of the air cooling condenser has great effect on the smooth running of the natural temperature close-loop self-circulation (CLSC) evaporative cooling system of large wind power generator. An optimum structure of the air cooling condenser for the evaporative cooling system is introduced in this paper which can do great help to insure the successful running of wind generator. All these will do great help to the development of the evaporative cooling large wind power generator.

Application of Advanced PID Controller for Wind Energy Conversion System with Optimal Design

The major factors of the global energy crisis, environmental pollution and climate change, are greatly promote the development and utilization of renewable energy. The large power wind power generation system was constructed based on squirrel-cage induction generator (SCIG), the mathematical models was created With MATLAB/Simulink platform, the SCIG vector control system was designed and the three closed control loop which were torque control loop, speed control loop, power control loop and the optimal control system was integrated at last, the simulation result shows this control system can realize optimal control for large wind energy conversion system which can effectively applied into SCIG wind power generation system for system modification.

On Resistance of Coolant in Air-Cooling Condenser of Self-Circulating Close-Loop Evaporative Cooling System of Wind Power Generator

As a clean and renewable energy, the wind power has attracted the attention of all nations in the world. Evaporative cooling technology has successfully been used in the research and development of wind power generator, but some key technique has to be studied in advance to insure the reliability of the very technology. The application of evaporative cooling technology in the cooling of large wind power generator is a new attempt in the discovery of wind power energy. Thorough study is carried out on the key technique of the application of close-loop self-circulation (CLSC) evaporative cooling technology on the running of wind power generator. The flow resistance of the coolant in the air cooling condenser is discussed in this paper, and a new approach is founded for the improvement of the reliability.

Application of Air-Cooled Close-Loop Self-Circulation Evaporative Cooling System on Wind Power Generator

The application of evaporative cooling technology in the cooling of large wind power generator is a new attempt in the discovery of wind power energy. In some particular circumstances, the air-cooling condenser must be adopted as the secondary cooler in the evaporative cooling system of large wind generator. For the cooling medium in the air-cooling condenser is the air and the distribution of temperature is uneven along the cooling tube, so it’s necessary to do deep research on it. Experiments are carried out to study the heat transfer characteristics of the air-cooling condenser used in the Close-loop Self-circulating (CLSC) evaporative cooling system. The temperature distribution and the heat transfer can be acquired from the experiment. Thorough study is carried out on restart up of the close-loop evaporative cooling system of the wind power generator. Experiments are done in the laboratory and real wind power generator, and it’s found that there is a critical point in the restart up of the generator. Only if the flow head overcome the critical point can the wind power generator restart automatically. The result shows that heat transfer can be enhanced by some special method and the air-cooling condenser can satisfy the demand of the cooling system.

Development of a city‐type compact wind power generation system

AbstractIt is necessary to use renewable energy, such as photovoltaic, wind power, and biomass energy, from the viewpoint of CO2 regulation and environmental protection of the Earth. In recent years, the tendency is toward larger wind power generation systems to achieve cheaper electricity. Generators having capacities of 1500 kW to 2000 kW tend to dominate the market. However, a large wind power generation system has limitations in terms of location and can be installed only in the suburbs. At the same time, a city‐type compact wind power generation system, designed for city needs, has more flexibility and can be installed in the residential areas of a city. In this paper, we introduce an original control operation system called a “pump‐up” operation system, designed to effectively use the city wind, and report the results of its field test. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(2): 56–63, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20440

大型風力発電施設に対する周辺住民とビジターの景観評価特性および差異

The purpose of the study was to determine how landscape that contains large wind power generation is evaluated and to clarify the differences resulting from the comparison with nearby residents and visitors respectively. A wind power generator in Kusatsu City, Shiga Prefecture, was the subject of the present case study. Landscape evaluation was conducted in two residential areas, one of them close by and the second one further away, and in two tourist attraction locations, similarly at varying viewing distance from the generator, by means of a questionnaire survey. Analysis of the comparison results revealed that the visitors evaluated the landscape much more positively than the local residents. Moreover, it was clarified that landscape evaluation by the visitors tended to be influenced by viewing distance at a much higher degree than in the case of the residents. And the evaluation by the residents seemed to be less moderated by viewing distance. Further analysis showed that landscape evaluation by the local residents was strongly influenced by co-evaluation of other, related factors, and that their judgment was affected by a more comprehensive understanding of the landscape.

Development of a City Type Compact Wind Power Generation System

It is necessary to use the renewable energy, such as photovoltaic, wind power, biomass energy, etc., from a viewpoint of CO2 regulation, environmental protection of the Earth. In recent years, the tendency is toward larger wind power generation system to achieve cheaper electricity price. The generators of 1500kW-2000kW capacity tend to dominate the market. However, a large wind power generation system has limitations on the location and can be installed only at suburbs. At the same time, a city type compact wind power generation system, designed for city needs, has more flexibility and can be installed at the residential areas of city. In this paper, we introduce an original control operation system called “pump-up operation system, designed to effectively use the city wind, and report the results of its field test.