voltage and power quality control in wind power new

7/29/2019 Voltage and Power Quality Control in Wind Power New

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VOLTAGE AND POWER QUALITY CONTROL IN

WIND POWER APPLICATIONS BY

MEANS OF DYNAMIC COMPENSATION

A.Sakthivel & Y.Venkatesh,

PPG IT, Coimbatore.


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WIND POWER


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INTRODUCTION

The worldwide installed capacity of wind power

reached 197 GW by the end of 2010.

China (44,733 MW), US (40,180 MW), Germany

(27,215 MW) and Spain (20,676 MW) are ahead of

India in fifth position.

The short gestation periods for installing wind

turbines, and the increasing reliability and

performance of wind energy machines has made

wind power a favored choice for capacity addition inIndia.


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VOLTAGECONTROL: AGROWINGCONCERN

Often, voltage regulation problems arise as a

consequence of grids being made dependent on

wind power, a matter of growing concern as wind

power gets more important in the power balance.

The problem is aggravated as traditional primary

power such as thermal generation gets lower

priority in the power supply balance, which is often

the case due to political and environmental

considerations.


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SOME BASIC MECHANISMS

Fig : Wind power infeed into radial feeder

network

U = (RP-XQ) / U


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TYPESOFFLUCTUATIONS

Tower shadow effect (periodic, f 1-2 Hz).

Wind turbulence

(stochastic, average frequency f < 0,1 Hz).

Switching of windmills (single events per hour).


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ASYNCHRONOUSMACHINE

Fig :Induction generator characteristics


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IMPACTONPOWERQUALITY

As can be expected, the severity of impact onpower quality from wind power operation isdependant on the strength, i.e. the fault level of thegrid to which a wind mill or indeed a whole windfarm is connected.

SN SSC / 50

If the rated power of the wind power plant exceeds

2% of the fault level of the grid, measures shouldbe taken to minimize the impact on power quality ofthe grid caused by switching of wind power plants.


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TYPESOFIMPACTS

Dynamic fault mitigation

Sudden islanding

Voltage collapse


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DYNAMIC COMPENSATION

SVC (Static Var Compensator)

SVC Light.


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DIAGRAMSOFONEPHASEOF

(TCR) AND (TSC)

Fig : Operating principle of TCR. Fig : Operating principle of TSC.


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DESIGNTYPES

Fig : TCR / FC configuration Fig : TCR / TSC configuration


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VOLTAGE SOURCE CONVERTER

Fig : VSC: a controllable voltage source.


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DYNAMIC VOLTAGE CONTROL

SCHEME

Fig : Combined SVC Light and short-time rated TSC


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SVC LIGHT: POWERFULFLICKERMITIGATION


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CONCLUSION

Wind power is gaining rapid momentum in the world

energy balance. With it, certain issues have to be

addressed in order to upkeep reasonable power

quality in sub transmission and distribution

networks more or less dependent on wind power.

An optional way is by means of voltage source

converter (VSC) based shunt compensation. Here,

SVC Light combines VSC technology and IGBT

(insulated gate bipolar transistor) technology toattain high dynamic response, a prerequisite for

efficient flicker mitigation.


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QUERIES??????

Thank You

voltage and power quality control in wind power new

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