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# PQ Load with Load-Flow

# Mask and Parameters

## General Parameters:

RLC connection type | |

RLC Parallel | RL parallel (when Q>0) or RC parallel (when Q<0) |

RL Series | RL series only |

Base voltage | Base value for PU conversion (kV) |

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

## Load Parameters:

Active power (P) | 3-phase active power (MW) |

Reactive power (Q) | 3-phase reactive power (Mvar) |

Np | Active power coefficient for load-flow constraints calculation |

Nq | Reactive power coefficient for load-flow constraints calculation |

# Ports, Inputs, Outputs and Signals Available for Monitoring

## Ports

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

## Inputs

- None

## Outputs

- None

## Sensors

**I(a,b,c):**Current for each phase (A)

# Description of the Load Model

## Load Model

The PQ load with load-flow consists of the parallel 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:

- The resistance value in the parallel combination is given by:

- When Q>0, the inductance value in the parallel combination becomes:

- When Q<0, the capacitance value in the parallel combination becomes:

Load-Flow Model

The load-flow model equations of this load are given by:

The P_{constraint} and Q_{constraint} power become the load-flow constraints for the model. The V_{load-flow} is the actual voltage magnitude solution on the load bus. The P and Q are the values specified in the mask as “Active Power (P)” and “Reactive Power (Q)”, respectively.

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