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This paper proposes a new control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). In this scheme, the generator and grid currents are controlled using a hysteresis current controller (HCC). The control system of the back-to-back converter based on the HCC is described. Modeling and simulation of the system are developed using Matlab/Simulink to...
The integration of renewable energy sources, especially wind energy, has been on the rise throughout the power system worldwide. Due to this relatively new introduction, the integration of wind energy is often not optimized. Moreover, owing to the technical constraints and transmission congestion of the power network, much wind energy that could have reached load centers has to be curtailed. Due to...
Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
With the development of offshore wind power generation, large-capacity medium-voltage wind turbine becomes the development trend. In this paper, the cascaded multi-cell topology with four-quadrant operation capacity is applied to medium-voltage wind power converters, which consist of a large number of switching devices, so it is essential to improve the converter's fault-tolerant ability. Once the...
This paper presents a medium voltage power conversion architecture for grid integration of multi-MW permanent magnet synchronous generator (PMSG) based wind energyc-conversion system (WECS). Converting the low voltage power output of the generator to medium voltage, can reduce the diameter of the power cable significantly. As a result, power loss and the overall cost of the system can be minimized...
This paper presents the implementation of a sensorless vector control scheme for a surface mounted Permanent Magnet Synchronous Generator (PMSG)-based Wind Energy Conversion System (WECS). This sensorless strategy is based on a sliding mode observer and a minimum order observer, which are used for estimating the position and the speed of the PMSG, respectively. The proposed sensorless scheme does...
With the vigorous development of new energy sources, wind power generation technology has been developed rapidly. Due to the reverse distribution of wind energy resources and load centers, large-scale wind power transmission is inevitable. Using series capacitor compensation technology is an effective measure to complete large-scale wind power transmission, but may induce sub-synchronous oscillation...
In remote regions, were a main Utility System for energy distribution is not available, the implementation of Microgrids with hybrid generation are very useful. In this context, a Stand-Alone wind/diesel/gas/battery/supercapacitors Hybrid Microgrid topology is proposed. The main scope is to create a low cost system to feed Residential loads through a local AC bus, using wind energy obtainable at system...
Offshore wind farms are growing as a renewable generation system. For long distance power transmission from offshore to mainland, a high voltage direct current (HVDC) system is cost-effective. This paper shows a new modulation technique for the voltage source converter (VSC) of a HVDC output offshore wind farm. It is called a modified trapezoidal modulation (MTM). This technique can greatly reduce...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
The paper presents a new wind power generation planning framework by considering the reactive power capabilities of generators. The motivation is to maximize the utilization of renewable power hosting capacity without violating the security constraints of distribution networks. The objective is to maximize the net present value of the investment considering the cost of grid energy transaction, initial...
Because of the wind power generation has good economic and social benefits, which has been aroused more and more people's attention. The variable pitch control has an important part in the wind turbine. The indexes of the variable pitch has great influence on the dynamic performance with the unit, which can become an important index to measure the performance of the wind turbine. Due to the non-linearity...
Real-time demand response pricing mechanism can guide electricity consumption habits through price signals, thereby saving costs and improving the quality of the electricity curve. In this paper, the carbon emission permits trade mechanism is introduced into real-time electricity price (RTP) mechanism. Under the basic principle of carbon trading and the traditional unit commitment model, an economic...
As a promising renewable resource to replace part of the energy supply, the wave energy is having more and more interest worldwide. This paper presents a comprehensive analysis of different wave energy technologies in order to identify more promising methods for power supply to tropical reefs. It starts with summarizing the characteristics of tropical reefs in which the most suitable places to be...
Renewable energy is the future of energy generation. As wind turbine is big part of this energy revolution, research of its impact to current electrical power grid is of paramount importance. Wind speed varies periodically and geographically. This variability of wind power generation needs to be compensated by the conventional generators. In doing so, the temperature of the generators increased in...
System frequency response can be negatively impacted by significant penetration of wind generation. This paper studies the effects of integrating Type-4 full converter wind turbine generators (WTG) on the frequency response of a test system. A controller that enables frequency response in a Type-4 WTG is then proposed to restore and improve the frequency regulation of the system. The design and performance...
Many islands in China are far from the mainland and electricity is difficult to cover or the cost is high, due to this issue, the wind energy, wave energy and solar energy can be used to meet the demand of island power supply. However, the energy density of these renewable energy sources is low and the stability is poor, which may cause power supply instability. To deal with this issue, a multi-energy...
The evaporative cooling system for wind power generator inclines at an angle of 3∼5 degrees. Due to the special structure, it forms a liquid-gas two-phase self-circulation. Two-phase flow self-circulating system is a typical nonlinear dynamic system. So it is important to study the nonlinear characteristics. In this paper, the nonlinear characteristics were studied through theoretical analysis and...
Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis...
After years of rapid development, wind energy has become one of the three major energy sources in China. Due to the rapid development of wind power industry, wind energy has become one of the most important energy sources in the world, the demand for wind turbines is also growing. Therefore, investigations of the wind turbines are particularly important. Dual-stator brushless doubly-fed generator...
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