Method For Controlling Power Distribution

摘要

Embodiments of the present invention produce and define a relationship between local voltage and power measurements at a node of an electrical network and system conditions on a remote branch of the network. These local measurements are used to determine an optimal voltage set point at the node that, if realised by a reactive power resource, would affect the flow of reactive power or line current at one or more particular remote branches of the power system in a manner captured by the derived relationship. The change in reactive power required to obtain this voltage set point is also calculated based on local measurements.

主权项

1. A method for controlling power distribution through an electrical network comprising:
a) modelling the network to:
relate current flow (|Iij|, Qij) in at least one designated branch connecting a pair of nodes (ij) of the network to a combination of measured voltage and power being injected at a node i of the network to which a device that injects and absorbs reactive power is connected;relate an expected voltage (VMinD) at the node i at a given level of network demand to a combination of active and reactive power being injected by said device at said node i;relate reactive power to voltage sensitivity∂Q(∂V) at the node i to a combination of voltage and power being injected at the node i; b) measuring voltage (V), and injected reactive power (Q) and active power (P) at the node i; c) calculating a desired set voltage (vSetOld) at said node i which minimizes current flow in said designated branch for a given measured voltage and power injected at the node i; d) calculating said expected voltage based on said injected reactive and active power; e) calculating an adjusted desired set voltage (vSetNew) based on said expected voltage; f) determining a required adjustment of said device's voltage set point (ΔVNew) based on a difference between said adjusted desired set voltage and said measured voltage; g) calculating a reactive power to voltage sensitivity∂Q(∂V) based on measured voltage and power injected at the node i; h) calculating a required change (ΔQ) to said device's reactive power setting as a function of said adjusted desired set voltage and said reactive power to voltage sensitivity; and i) communicating said required change to said device.