Description: "AC system, symmetrically loaded three-phase"

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## Buildings.Electrical.PhaseSystems.ThreePhase_dq

AC system, symmetrically loaded three-phase

### Information

This package declares the functions that are used to implement the AC three-phase balanced models using the DQ representation.

Extends from PartialPhaseSystem (Base package of all phase systems).

### Package Content

Name | Description
--- | ---
j | Return vector rotated by 90 degrees
thetaRel | Return absolute angle of rotating system as offset to thetaRef
thetaRef | Return absolute angle of rotating reference system
phase | Return phase
phaseVoltages | Return phase to neutral voltages
phaseCurrents | Return phase currents
phasePowers | Return phase powers
phasePowers_vi | Return phase powers
systemVoltage | Return system voltage as function of phase voltages
systemCurrent | Return system current as function of phase currents
activePower | Return total power as function of phase powers
Inherited
phaseSystemName="UnspecifiedPhaseSystem" | Name of the phase system represented by the package
n | Number of independent voltage and current components
m | Number of reference angles
Current | Current for connector
Voltage | Voltage for connector
ReferenceAngle | Reference angle for connector
jj | Vectorized version of j
rotate | Rotate a vector of an angle Theta (anti-counterclock)
product | Multiply two vectors
divide | Divide two vectors

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.j

Return vector rotated by 90 degrees

### Information

Extends from (Return vector rotated by 90 degrees).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Real | x[n] |  |

### Outputs

Type | Name | Description
--- | --- | ---
Real | y[n] |

### Modelica definition

redeclare function extends j "Return vector rotated by 90 degrees" algorithm y := {-x[2], x[1]}; end j;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.thetaRel

Return absolute angle of rotating system as offset to thetaRef

### Information

Extends from (Return absolute angle of rotating system as offset to thetaRef).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Angle | theta[m] |  | [rad]

### Outputs

Type | Name | Description
--- | --- | ---
Angle | thetaRel | [rad]

### Modelica definition

redeclare function extends thetaRel "Return absolute angle of rotating system as offset to thetaRef" algorithm thetaRel := 0; end thetaRel;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.thetaRef

Return absolute angle of rotating reference system

### Information

Extends from (Return absolute angle of rotating reference system).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Angle | theta[m] |  | [rad]

### Outputs

Type | Name | Description
--- | --- | ---
Angle | thetaRef | [rad]

### Modelica definition

redeclare function extends thetaRef "Return absolute angle of rotating reference system" algorithm thetaRef := theta[1]; end thetaRef;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.phase

Return phase

### Information

Extends from (Return phase).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Real | x[n] |  |

### Outputs

Type | Name | Description
--- | --- | ---
Angle | phase | [rad]

### Modelica definition

redeclare function extends phase "Return phase" algorithm phase := atan2(x[2], x[1]); end phase;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.phaseVoltages

Return phase to neutral voltages

### Information

Extends from (Return phase to neutral voltages).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Voltage | V |  | system voltage [V]
Angle | phi | 0 | phase angle [rad]

### Outputs

Type | Name | Description
--- | --- | ---
Voltage | v[n] | phase to neutral voltages [V]

### Modelica definition

redeclare function extends phaseVoltages "Return phase to neutral voltages" algorithm v := {V*cos(phi), V*sin(phi)}/sqrt(3); end phaseVoltages;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.phaseCurrents

Return phase currents

### Information

Extends from (Return phase currents).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Current | I |  | system current [A]
Angle | phi | 0 | phase angle [rad]

### Outputs

Type | Name | Description
--- | --- | ---
Current | i[n] | phase currents [A]

### Modelica definition

redeclare function extends phaseCurrents "Return phase currents" algorithm i := {I*cos(phi), I*sin(phi)}; end phaseCurrents;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.phasePowers

Return phase powers

### Information

Extends from (Return phase powers).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
ActivePower | P |  | active system power [W]
Angle | phi | 0 | phase angle [rad]

### Outputs

Type | Name | Description
--- | --- | ---
Power | p[n] | phase powers [W]

### Modelica definition

redeclare function extends phasePowers "Return phase powers" algorithm p := {P, P*tan(phi)}; end phasePowers;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.phasePowers_vi

Return phase powers

### Information

Extends from (Return phase powers).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Voltage | v[n] |  | phase voltages [V]
Current | i[n] |  | phase currents [A]

### Outputs

Type | Name | Description
--- | --- | ---
Power | p[n] | phase powers [W]

### Modelica definition

redeclare function extends phasePowers_vi "Return phase powers" algorithm p := {v*i, -j(v)*i}; end phasePowers_vi;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.systemVoltage

Return system voltage as function of phase voltages

### Information

Extends from (Return system voltage as function of phase voltages).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Voltage | v[n] |  | [V]

### Outputs

Type | Name | Description
--- | --- | ---
Voltage | V | [V]

### Modelica definition

redeclare function extends systemVoltage "Return system voltage as function of phase voltages" algorithm V := Modelica.Fluid.Utilities.regRoot(3*v*v, delta= 1e-5); end systemVoltage;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.systemCurrent

Return system current as function of phase currents

### Information

Extends from (Return system current as function of phase currents).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Current | i[n] |  | [A]

### Outputs

Type | Name | Description
--- | --- | ---
Current | I | [A]

### Modelica definition

redeclare function extends systemCurrent "Return system current as function of phase currents" algorithm I := Modelica.Fluid.Utilities.regRoot(i*i, delta= 1e-5); end systemCurrent;

## Buildings.Electrical.PhaseSystems.ThreePhase_dq.activePower

Return total power as function of phase powers

### Information

Extends from (Return total power as function of phase powers).

### Inputs

Type | Name | Default | Description
--- | --- | --- | ---
Voltage | v[n] |  | phase voltages [V]
Current | i[n] |  | phase currents [A]

### Outputs

Type | Name | Description
--- | --- | ---
ActivePower | P | active system power [W]

### Modelica definition

redeclare function extends activePower "Return total power as function of phase powers" algorithm P := v[1]*i[1]; end activePower;