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With a view to the integration in national power system of new power plants based on renewable energy sources, such as wind energy, this paper presents the technical requirements related to the connection of the wind power plants to the main grid. Grid connected wind turbines may cause power quality problems, such as voltage variation and flicker, and therefore, the connection of wind farms requires...
To meet the clean energy challenges, the wind farms creation is one of the most promising alternatives. The wind project developer must verify whether there would be a risk on the existing broadcast links in the area before moving towards the construction phase. Geometrical wind turbine modeling can help in determining the scattering of the signal around and assess whether the signal reception in...
This paper presents steady-state performance analysis of a commercial wind farm in Taiwan through field measurement results and computer simulations. The companion paper in Part II discusses the employment of current-limit reactors and load tap changers on power-quality improvement of the studied wind farm. With twenty-three 2-MW DFIG-type wind turbine generators, this wind farm is connected to the...
To improve the stability of the power system integrated of wind farm, the wind power system energy function is proposed in this paper based on the energy conservation law. Then a stability control strategy based on the energy function is introduced. The impacts of DFIG operation limits on the control effect are also discussed. By variable speed operation, the control strategy restrains the wind power...
With the increasing share of the wind power in the power system, the impact of its integration is becoming more widespread. Based on the wind farm output forecasting and local electric network active power optimization results, the wind turbines electric control parameters are calculated as inputs to the pitch controller. A pitch control power regulation method based on application integration is...
For wind farms in near sea, in which doubly-fed induction generator (DFIG) runs, located at different site respectively, multi-terminal VSC-HVDC (Voltage Source Converter based HVDC) helps to resolve connection for each other and transmitting electrical power into main grid. The paper models wind farms, VSC-HVDC, designs control system and specially takes their control together into account in order...
With the wind power installation capacity sharply increasing, the effects caused by wind farms on the regional power system stability becomes very remarkable. Accordingly, more and more researches are focused on the low voltage ride through (LVRT) technology used for DFIG under short-time grid fault, and new power grid regulation requires power system to achieve LVRT capability. But we have no interrelated...
This article is concerned with the impact of large-scale wind farms utilizing double fed induction generator (DFIG) on the transient stability to a general power system. In the first instance, the synthetical dynamic model of the wind turbine generators (WTGs) is introduced, including pitch angle control model and the generator protective model. And then, the simulation is made to the CIGRE B4-39...
The paper studies reactive power compensation strategy of wind farm based on optislip wound rotor induction generators (WRIGs). The WRIGs wind farm shares high market occupancy in China, but academic researches on this grid-connected wind generation are few. Due to the WRIGs wind turbines not allowing the control of the reactive power, so it is necessary that reactive power compensation device is...
During recent years, the size of individual wind turbines has grown closer to 10 MW, and the size of wind power plants has increased significantly to 300 MW or more. This growing size of wind power generation requires that careful evaluation of transient stability of the overall grid should be undertaken. This paper attempts to investigate the impact of wind power plant penetration on the transient...
Since the doubly fed induction generator (DFIG) converters are designed by the slip power (a fraction 25-30% of the total power) to achieve full control of the generator, there is not enough capacity to provide reactive power when the voltage dips below the tolerable grid voltage level at the point of common coupling (PCC). We propose in this paper to use the static synchronous compensator (STATCOM)...
Calculation of short circuit current is an important task for wind farm and power system. In this paper transient of DFIG is analyzed under short circuit condition, and the theorem of constant flux linkage is applied to determine short circuit currents in the synchronously rotating reference frame dqo. Then, transient response of different order models considering or ignoring this theorem is obtained...
The electrical power production from dispersed energy sources or distributed generation is playing an increasing role in the supply of electricity in the liberalized electricity markets. Distributed generation can have a significant impact on the power flow, voltage profile, stability and the power quality for both customers and electricity suppliers. In this paper it is studied and analysed the influence...
Voltage stability is a key issue to achieve the uninterrupted operation of wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. This paper investigates the application of a static synchronous compensator (STATCOM) to assist with the uninterrupted operation of a wind turbine driving a DFIG, which is connected to a power network, during grid faults. The control schemes...
As the number and size of wind farms continue to grow, many countries have established or are developing a set of specific requirements (i.e., grid codes) for operation and grid connection of wind farms. The objective of these grid codes is to ensure that wind farms do not adversely affect the power system operation with respect to security of supply, reliability and power quality. This paper reviews...
This paper, presents a pitch controlled Wind Turbine Generation System (WTGS) which is used in practice now a days, to have optimum power flow and to reduce overloading of wind turbine when higher wind speeds are available. Also, a pitch control system is used for stabilization of the wind turbine at grid faults. Application of Static Synchronous Compensator (STATCOM) and static capacitor bank is...
Increasing penetration of the large wind farm in the system has forced the power system policy makers to develop new electricity grid codes which are required for the wind power generator to fulfill the same requirements as conventional power plants. In this paper, a series connected grid side converters with conventional doubly-fed induction generator (DFIG) scheme is explored to suit the grid code...
This paper presents transient stability analysis for a power system with high wind penetration. The transient stability has been evaluated based on two stability criteria: rotor angle stability and voltage stability. A modified IEEE-14 bus system has been used as the main study network and simulations have been conducted at several wind power penetration levels, defined as a fraction of total system...
Due to the recent expansion of renewable energy applications, wind energy conversion is receiving much interest all over the world. However, output fluctuations of wind generators cause network frequency variations in power systems. This can decrease the power quality and then cause a restriction of wind farm installation, especially in an isolated power system, for example, power system in a small...
Indirect and direct vector control strategies can be applied to a stand alone doubly fed induction generator (DFIG) for wind energy applications. The control algorithm allows generating constant frequency and voltage with variable mechanical speed. The maximum power tracking can only be realised by controlling the load power. In this study the load was modelled as a controlled rectifier supplying...
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