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# Harmonic Load

# Mask and Parameters

## General Parameters

Description | Use this field to add all kinds of information about the component |

Dynamic load status | If “Enable”, the load is ON; if “Disable”, the load is OFF |

Measuring filter status | If “Enable”, the measuring filter is ON, and if “Disable”, the filter is OFF; The measurement filter is a second order Butterworth filter applied on the Vd and Vq voltage components extracted from the positive-sequence voltage input. |

Base power (total) | Base value pour PU conversion (MVA) |

Base voltage (rmsLL) | Base value pour PU conversion (kV) |

Base frequency | Base value pour PU conversion (Hz) |

Dynamic Load Parameters

V_{min}: | Voltage threshold below which the load behaves as a constant impedance (pu) |

U_{0} | Nominal voltage in relation to the base voltage (pu) |

P_{0} | Nominal active power at U0 (MW) |

Q_{0} | Nominal reactive power at U0 (Mvar) |

R _{s} | Series resistance (ohm) |

L_{s} | Series inductance (H) |

R _{p} | Shunt resistance (ohm) |

L_{p} | Shunt inductance (H) |

C _{p} | Shunt capacitance (F) |

n_{p} | Active power variation coefficient as a function of the voltage |

n_{q} | Reactive power variation coefficient as a function of the voltage |

k_{p} | Active power variation coefficient as a function of the frequency |

k_{q} | Reactive power variation coefficient as a function of the frequency |

T_{p1} | Time constant to calculate the active power of the load |

T_{p2} | Time constant to calculate the active power of the load |

T_{q1} | Time constant to calculate the reactive power of the load |

T_{q2} | Time constant to calculate the reactive power of the load |

## Random Load Parameters

Seed for P0 and Q0 | Root for the random generation of P0 and Q0 |

Seed for T | Root for the random generation of each interval |

Tmin | Minimum time interval between two changes of P0 and Q0. The distribution is always uniform between Tmin and Tmax. |

Tmax | Maximum time interval between two changes of P0 and Q0. The distribution is always uniform between Tmin and Tmax. |

P0 distribution | Specify distribution type for P0(Uniform / Gaussian) |

P0min | In the case of a uniform distribution, minimum value of P0 (MW) |

P0max | In the case of a uniform distribution, maximum value of P0 (MW) |

P0avg | In the case of a Gaussian distribution, average value of P0 (MW) |

P0var | In the case of a Gaussian distribution, variance value of P0 (MW) |

Q0 distribution | Specify distribution type for Q0(Uniform / Gaussian) |

Q0min | In the case of a uniform distribution, minimum value of Q0 (Mvar) |

Q0max | In the case of a uniform distribution, maximum value of Q0 (Mvar) |

Q0avg | In the case of a Gaussian distribution, average value of Q0 (Mvar) |

Q0var | In the case of a Gaussian distribution, variance value of Q0 (Mvar) |

## Harmonic Current Source Parameters

Harmonic numbers: | The number of each harmonic to inject as current |

Harmonic current amplitudes relative to fundamental | Current amplitude for each harmonic (% of current of the fundamental) |

Harmonic current phases relative to fundamental | Current phase for each harmonic (degrees relative to the phase of the fundamental) |

# Ports, Inputs, Outputs and Signals Available for Monitoring

## Ports

Network connection (supports only 3-phase connections)**Net_1:**

## Inputs

- None

## Outputs

- None

## Sensors

E(a,b,c) | Output voltage of the dynamic load (V) |

Ed | Direct (D) axis output voltage (pu) |

Eq | Quadrature (Q) axis output voltage (pu) |

Frequency | Network frequency (Hz) |

FundAng_a | Angle value of the fundamental current of the load for phase A (degrees) |

Harmo | (deg) |

I(a,b,c) | Current of the dynamic and random loads only; does not include the harmonic current (A) |

I(a,b,c)Fund | Value of the current of the fundamental (A) |

I(a,b,c)Harm | Harmonic current to be injected by the current source only (A) |

I(a,b,c)Total | Total current of the harmonic load; includes the dynamic and random parts along with the injected harmonic current (A) |

P | Total active power of the load (pu) |

Pcomp | Compensating active power; originating from the internal voltage source (pu) |

Period | Inverse of the frequency (s) |

Po | Reference value for active power of the load, including random variations (pu) |

Q | Total reactive power of the load (pu) |

Qcomp | Compensating reactive power; originating from the internal voltage source (pu) |

Qo | Reference value for reactive power of the load, including random variations (pu) |

V(a,b,c) | Value of the internal voltage of the source allowing to inject the desired power (V) |

Vd | Direct (D) axis voltage (pu) |

Vq | Quadrature (Q) axis voltage (pu) |

Vrms | Average value of the positive-sequence voltage (pu) |

# Description of the Load Model

For more information on the dynamic load, read here.

The two main differences between the dynamic and the harmonic loads are the following:

- Firstly, a programmable random variation part can be added to the P1 and Q1 power components provided by the internal source.
- Secondly, the same load calculates a percentage of harmonics based on the fundamental and can then re-inject these harmonics as current.

OPAL-RT TECHNOLOGIES, Inc. | 1751, rue Richardson, bureau 1060 | Montréal, Québec Canada H3K 1G6 | opal-rt.com | +1 514-935-2323