Grid connection of wind energy sources is essential if they are to be effectively exploited, but grid connection brings a number of problems. In the paper, Distributed Generation and Wind Power integration problems are discussed. Many early wind turbines utilized a squirrel-cage or wound-rotor induction generator to produce electricity. However, they absorbed large amounts of reactive power and sometimes caused severe voltage stability problems on the grid. This paper includes introduction of different wind turbine technologies and its effect on power system, at last we summarized with wind power impact on power system operating cost. Human beings have become adapted to the conveniences and extensive use of electrical power for over a century. In an effort to meet this high demand for electric power, mankind has implemented several methods of electric power generation.
Keywords: wind energy, power system, induction generator, integration issues
[...] Milligan, “Wind Power Impact On Electrical Power System Operating Cost: Summary And Perspective On Work To American Wind Energy Association Global Wind Power Conference, March-2004. Study Total BPA We I We II Table 1 Summary Of Result Unit-commitment horizon of 1 day to 1 week with 1-hour time increments. Load - following horizon of 1 hour with 5 to 10 minute (intra hour) and several hours (inter-hour) increments. Regulation horizon of 1 minute to 1 hour with to 5-second increments. [...]
[...] Integration of large scale wind farms into power systems presents some challenges that must be addressed, such as system operation and control, system stability and power quality. Grid operators routinely control the supply of electricity by cycling generating plants on or off at different timescales. Most grids also have some degree of control over demand, through either demand management or load shedding. Variability of wind output creates a challenge to integrating high levels of wind into energy grids based on existing operating procedures. [...]
[...] So there are chances of more o oscillation of rotor which result in rotor angle instability of synchronous generator and rotor speed instability of asynchronous generator. Critical clearing time of DG is also lesser. So at the time of fault DG have to be isolated from the network immediately. Frequency of the system drops if DG contributing major power in the system GRID INTEGRATION ISSUES OF WIND POWER GENERATION The development in wind turbine systems has been steady for the last 25 years and four to five generations of wind turbines exist. The conversion of wind power to mechanical power is done aerodynamically. [...]
[...] This is the same type of machine used in a traditional power plant. The machine generates electrical power at a frequency directly related to the shaft speed by some fixed ratio. In order to achieve variable speeds, the output of the synchronous generator is electronically converted to grid frequency via an inverter, Fig Because the current output of the inverter is fully controllable, the inverter can control the real and reactive power transferred to the grid. If permanent magnets are used on the synchronous machine rotor to generate flux, then this type of machine is also referred to as a permanent magnet machine. [...]
[...] Wind energy cannot participate in frequency control because its output is independent of the system frequency but wind power fluctuation within short period, can affect system LFC Voltage Regulation This service is used to maintain voltage within prescribed limits at various points in the transmission grids. Generator or other device (phase shifter, FACTS, VAR compensator) automatically provide required reactive power. Lack of automatic reactive power adjusting 5. WIND POWER IMPACT ON POWER SYSTEM OPERATING COST Wind power plants output depends on the wind speed, which cannot be predicted with high accuracy over daily periods. [...]
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