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# PQ Load, 1-Ph series

# Mask and Parameters

## General Parameters:

V0 | Base value for PU conversion (kV) |

F0 | Base value for PU conversion (Hz) |

## Load Parameters:

Base active power (P0) | 1-phase active power under nominal conditions (kW) |

Base reactive power (Q0) | 1-phase reactive power under nominal conditions (kW) |

Np | Active power - Voltage variation coefficient |

Nq | Reactive power - Voltage variation coefficient |

Kpf | Active power - Frequency variation coefficient |

Kqf | Reactive power - Frequency variation coefficient |

# Ports, Inputs, Outputs and Signals Available for Monitoring

## Ports

**Net_1:**Network connection (supports only 1-phase connections)**Net_3:**Network connection (supports only 1-phase connections)

## Inputs

- None

## Outputs

- None

## Sensors

**F:**Estimated current at the point of connection**Lout:**Effective inductance or Capacitance**Rout:**Effective resistance**Vrms:**Estimated RMS voltage at the point of connection

# Description of the Load Model

## Load Model

The PQ load consists of the series combination of equivalent R, L and C branches and the series combination of equivalent R and L branches. The following rules are applied:

- If P=0 and Q=0, the element becomes disconnected in all solution methods.
- The RL series inductance equivalent is calculated using:

- The resistance value in the RL series combination is given by:

- When Q<0, the capacitance value becomes:

## Model Equations

The model equations of this load are given by:

where:

: Active power under nominal conditions

: Reactive power under nominal conditions

: Nominal voltage

: Frequency deviation from the nominal value F0 in pu.

: Active power-Frequency coefficient

: Reactive power-Frequency coefficient

: Active power-Voltage coefficient

: Reactive power-Voltage coefficient

: RMS voltage measured between connection nodes **Net_T1** and **Net_T3**

By adjusting Np and Nq equal to 0, 1, or 2, the load can be set to work as a constant power, constant current, or constant impedance, respectively.

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