# pvl_adrinverter

Anton Driesse's Grid-Connected PV Inverter Model

## Contents

- Syntax
- Description
- Inputs
- Outputs
- Example 1
- Example 2
- References
- See Also

## Syntax

- `ACPower = pvl_adrinverter(Inverter, Vdc, Pdc)`

## Description

Computes AC power output using Anton Driesse's Grid-Connected PV Inverter model.

## Inputs

- `Vdc` - a vector of modeled DC voltage
- `Pdc` - a vector of modeled DC power
- `Inverter` - A struct defining the inverter to be used, giving the inverter performance parameters according to the Sandia Grid-Connected Photovoltaic Inverter Model (SAND 2007-5036) [1]. A set of inverter performance parameters are provided with PV_LIB (`\Required Data\SandiaInverterDatabaseSAM2012.11.30.mat`), or may be generated from a System Advisor Model (SAM) [2] library using the SAM library reader function `pvl_SAMLibraryReader_SNLInverters`. Required struct components are:
- `Inverter.Pac0` - AC-power output from inverter based on input power and voltage, (W)
- `Inverter.Pdc0` - DC-power input to inverter, typically assumed to be equal to the PV array maximum power, (W)
- `Inverter.Vdc0` - DC-voltage level at which the AC-power rating is achieved at the reference operating condition, (V)
- `Inverter.Ps0` - DC-power required to start the inversion process, or self-consumption by inverter, strongly influences inverter efficiency at low power levels, (W)
- `Inverter.C0` - Parameter defining the curvature (parabolic) of the relationship between ac-power and dc-power at the reference operating condition, default value of zero gives a linear relationship, (1/W)
- `Inverter.C1` - Empirical coefficient allowing Pdco to vary linearly with dc-voltage input, default value is zero, (1/V)
- `Inverter.C2` - empirical coefficient allowing Pso to vary linearly with dc-voltage input, default value is zero, (1/V)
- `Inverter.C3` - empirical coefficient allowing Co to vary linearly with dc-voltage input, default value is zero, (1/V)
- `Inverter.Pnt` - ac-power consumed by inverter at night (night tare) to maintain circuitry required to sense PV array voltage, (W)

## Outputs

- `ACPower` - a column vector of modeled AC power output given the input DC voltage, Vdc, and input DC power, Pdc. When ACPower would be greater than Pmax, it is set to Pmax to represent inverter "clipping". When ACPower would be less than -Pnt (energy consumed rather than produced) then ACPower is set to -Pnt to represent nightly power losses. ACPower is not adjusted for maximum power point tracking (MPPT) voltage windows or maximum current limits of the inverter.

## Example 1

    load 'DriesseInverterDatabaseSAM2013.10.mat';
    % PV Powered PVP2500 is entry #377
    Inverter = ADRInverterDB(377)

    Inverter =

      struct with fields:

                   Name: 'PV Powered: PVP2500 240V [CEC 2006]'
           Manufacturer: 'PV Powered'
                  Model: 'PVP2500'
                 Source: 'CEC'
                    Vac: 240
                Vintage: 2006
                 Pacmax: 2500
                   Pnom: 2520
                   Vnom: 219
                   Vmin: 142
                   Vmax: 402
        ADRCoefficients: [0.0163 8.2000e-04 0.0315 0.0061 0.0033 0.0043 0 0 0]
                    Pnt: 3.9000
                 Vdcmax: 500
                 Idcmax: 20
                MPPTLow: 140
                 MPPTHi: 450
                TambLow: -20
                 TambHi: 40
                 Weight: 70
               UniqueID: 176
              RowNumber: 377

Assume DC power is 1,000 W and voltage is 400 V

    Pdc = 1000; %DC power is 1000 W
    Vdc = 400; % DC violtage is 450 V
    ACPower = pvl_adrinverter(Inverter, Vdc, Pdc)

    ACPower =

      928.6313

Inverter efficiency can be calculated as:

    Inverter_Efficiency = ACPower/Pdc

    Inverter_Efficiency =

        0.9286

## Example 2

    Pdc = 0;
    Vdc = 0;

When there is no DC power the inverter still draws power from the grid. This is expressed as a negative power output.

    ACPower = pvl_adrinverter(Inverter, Vdc, Pdc)

    ACPower =

       -3.9000

## References

- [1] A. Driesse, P. Jain, S. Harrison, Beyond the Curves: Modeling the Electrical Efficiency of Photovoltaic Inverters, 33rd IEEE PVSC, San Diego, CA 2008.

## See Also

`pvl_snlinverter`

Copyright 2014 Sandia National Laboratories