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This paper presents a fault ride through (FRT) control strategy for offshore MT HVDC (multi-terminal high voltage DC), which integrates type-4 wind-turbine based offshore-wind farms. The proposed control strategy are responsible for relieving DC voltage rise effects during a temporary grid side (GS) converter outage, by setting local measurements and communication-free control rules in wind farm (WF)...
Electricity supply is a fundamental need of a modern society. A crucial property of electricity supply — reliability, is achieved by keeping a power system in a secure state most of the time. A secure state means that the risk of a disturbance to spread further and endanger the system integrity, resulting into supply interruption, is minimal. Large wind power integration can also lead to problems...
In the process of wind power generation, the power curve of wind power generating unit reflects the operating state and the actual generating capacity of the wind turbine. And it is also an important indicator of the performance of the wind turbine. In this paper, a new method — method of grid is proposed based on IEC61400-12-1 standard. In this method, the wind speed — power coordinate system is...
Uncertainty in wind power generation poses significant challenges to the operation of power systems. To tackle these challenges, a robust unit commitment model minimizing the fuel cost of conventional generators in coordination of the pumped storage plants is established to accommodate stochastic wind power. Wind power output is defined by uncertainty set which contains the worst-case scenario of...
Terceira island has a great potential for geothermal energy, which can contribute to increase the penetration of renewable energies in the generation mix. But as a small size island grid, several technical issues can appear. This paper models the power system in Terceira island before the installation of any new renewable power plant. Thus, the steady-state and dynamic performance of the power system...
Classic unit commitment (UC) is an important and challenging task of allocating generating units subject to basic constraints over a scheduled time horizon to obtain the least generation cost. Penetration of wind power generator in a modern power system makes generation planning more complex. This study presents the effect of uncertain wind power on joint energy and spinning reserve scheduling. An...
This work introduces a new method for connecting offshore wind turbine generators (WTGs) in series when interfaced to a medium voltage DC (MVDC) collection grid. Limiting the series stacking to pairs of WTGs and introducing a power sharing converter (PSC) stage between them allows series connected WTGs to operate at independent power levels in a voltage sourced collection grid. This allows for reduced...
There is a trend to build wind turbines in large wind farms and in the near future to operate such a farm as an integrated power production plant. Predictability of individual turbine behaviour is key in such a strategy. In order to minimize the influence on the balance of the electricity grid it is necessary to have stable electricity production by each of the turbines. Hence all turbines should...
Popularity of the offshore wind farms in recent years has been increased because the wind resource in offshore is higher with uniform wind speed and availability of large sea area. Most of the offshore wind farms have MVAC (Medium voltage Alternating Current) distribution system. In this paper MVDC (Medium Voltage Direct Current) distribution system is proposed and the performance of this is compared...
Today, wind generators have to compete with many other energy sources. Therefore, it is important that they should be cost effective. They need to meet any load requirements and produce energy at a minimum cost per dollar of investment. This paper investigates about the studies of voltage collapse in grid while integrating the wind turbine equipped with squirrel cage induction generator. The aim of...
With the rapid increase of grid-integrated capacity of wind farms, the risk of power system blackouts has increased significantly for the reason that output of wind farms is of fluctuation and uncertainty. The potential of wind farms participating in power system restoration after blackouts has not been adequately excavated. This paper firstly proposes a hybrid black start unit(BSU) containing combustion...
This paper presents a remote renewable plant with hydro-pump station as energy storage that will also compensate main utility voltage sag. The hydro-pump station receives mechanical power from the water flow between the upper and lower reservoirs. This network-connected plant has a local 9 MW wind farm which uses doubly-fed induction generators (DFIG) as well as a critical load. The hydro pump station...
An improved aggregated model of the wind farm is proposed in this paper to reduce the active and reactive power error caused by wind farm equivalence. The simulation experiments are done while the wind farm is represented by the detailed model, the improved aggregated model and the common used aggregated model respectively using Matlab/Simulink. The results show that the improved aggregated model...
The increase of distributed generation is expected to generate instabilities, such as power imbalances or voltage deviations in the power system. At the distribution level, maintaining the bus voltages within the stipulated limits is one of the major challenges for the distribution system operator. Under low penetration levels, several voltage regulation elements have been efficiently employed up...
This paper deals with a case study regarding the most suitable wind turbine for the energy production in an installation site in the South of Italy. Starting from the anemometer data of the installation site, in which the terrain is flat and without obstacles, at regular speed and low turbulence, five types of wind turbines with different sizes and technologies are considered in order to calculate,...
It is very important to stable the grid connected wind farms output power. This paper presents a fixed speed wind turbine based Induction generator (IG) including energy capacitor system (ECS) which is the combination of power electronics and electric double layer capacitor (EDLC). It is seen that ECS can significantly compensate voltage and power fluctuations of grid-connected fixed-speed wind generator...
Bidding plays an important role for Gencos (Generation Companies) participating in competitive electricity markets with the objective of maximizing profit. The characteristics of generators and price uncertainty need to be considered while formulating bidding strategies as they have a direct impact on expected profit. The rapid development of wind technology leads to an increasing share of wind power...
This paper proposes a new method to suppress frequency variations of power system with large amount of wind power installed by using the kinetic energy of the wind power generators. In recent years, environmental problems have been becoming serious and wind power generation with less environmental impacts has attracted much attention and introduced. Since wind power generation is an unstable power...
The number of dispersed energy resources is growing every day, such as the use of more distributed generators. This paper deals with energy resource scheduling model in future smart grids. The methodology can be used by virtual power players (VPPs) considering day-ahead time horizon. This method considers that energy resources are managed by a VPP which establishes contracts with their owners. The...
The volatility of the wind generation reduces the profits of wind generators as a consequence of the differences between the real wind generation and the wind power offered in the electricity markets. This paper presents two models: i) wind and generic storage system offering without a physical connection and ii) wind and generic storage system offering with a physical connection to mitigate the wind...
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