Vacon NX Series Applications Manual

Also see for NX series: User manual User manual Applications manual Maintenance manual Operating guide

Contents

Vacon NX Series Applications Manual Manual pdf 83 page image

arfiff08 power generation VACON® • 83Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/6.5.2 MPP trackerMPPT idea is to find maximum power point in any conditions. This MPPT tracker recognizes whenthere are stable or fast moving conditions.P2.5.2.1 Minimum Step SizeID 1810Minimum step size for the maximum power point tracker. MinStepSize is used when(P(k)-P(k-1))/(U(k)-U(k-1)) is below MinStepRatio. Scaled linearly between MinStepSizeand MaxStepSize when step ratio is between MinStepRatio and MaxStepRatiorespectively.P2.5.2.2 Maximum Step SizeID 1811Maximum step size for the maximum power point tracker. MaxStepSize is used when(P(k)-P(k-1))/(U(k)-U(k-1))(step ratio) is above MaxStepRatio. Scaled linearly betwenMinStepSize and MaxStepSize when step ratio is between MinStepRatio andMaxStepRatio respectively.P2.5.2.3 Minimum Step RatioID 1814Minimum step size for the maximum power point tracker. MinStepSize is used when(P(k)-P(k-1))/(U(k)-U(k-1)) is below MinStepRatio. Scaled linearly between MinStepSizeand MaxStepSize when step ratio is between MinStepRatio and MaxStepRatiorespectively.P2.5.2.4 Maximum Step RatioID 1813Maximum step size for the maximum power point tracker. MaxStepSize is used when(P(k)-P(k-1))/(U(k)-U(k-1)) (step ratio) is above MaxStepRatio. Scaled linearly betwenMinStepSize and MaxStepSize when step ratio is between MinStepRatio andMaxStepRatio respectively.P2.5.2.5 Min DC ReferenceID 1818Minimum DC Reference to which the MPP tracker will limit itself and not go below.109,00% is close to the theoretical minimum value if nominal AC voltage is 230-280V.P2.5.2.6 Step TimeID 1812This parameter defines how often the MPP tracker will take a step in any direction.P2.5.2.7 Power Filter TimeID 1827The MPP tracker compares the power value before and after a step to see if it hasincreased or decreased. Hence, if it's going in the right or wrong direction respectively.This parameter adds a low pass filter to the compared signal.P2.5.2.8 Use Averaged Power MeasurementID 1831This parameter enables or disables the 10 sample averaging of the output power figureto filter out noise from the measurement.