Method for determining power flow in an electrical distribution system
AssigneeSiemens Energy, Inc.
InventorIlya Roytelman
Life of this patent
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Abstract
A method for determining a power flow in an electrical distribution network (104) includes determining respective feeder apparent powers of electrical power feeders (114) connected at a supply node (118) of the electrical distribution network. The method also includes determining a feeder power factor angle of at least one of the feeders responsive to the feeder apparent powers, a supply node active power, and a supply node reactive power. The method then includes using at least one of the feeder power factor angles for determining a power flow in the electrical distribution network, such as by calculating feeder active and reactive power and using these powers to provide load allocation.
Claims19
A method for determining a power flow in an electrical distribution network comprising:
- determining respective feeder apparent powers of a plurality of electrical distribution network feeders receiving electrical power from a supply node of an electrical distribution network responsive to respective feeder currents in the feeders and a node voltage of the supply node;
- generating a system of node equations having feeder power factor angles of each of the feeders as variables and relating the feeder apparent powers with respect to a supply node active power, and a supply node reactive power, wherein the system of node equations is defined as follows:
- Pinj=S1 cos φ1+S2 cos φ2+S3 cos φ3+ . . . +Sn cos φn,
- Qinj=S1 sin φ1+S2 sin φ2+S3 sin φ3+ . . . +Sn sin φn
- wherein n is a positive integer that represents a number of feeders, φn represents a power factor angle for an nth feeder, Sn represents apparent power for the nth feeder with respect to injected active power Pinj and injected reactive power Qinj;
- solving the system of node equations for at least one of the feeder power factor angles;
- and
- using the feeder power factor angle for determining a power flow in the electrical distribution network.
A method for determining a power flow in an electrical distribution network comprising:
- determining respective feeder apparent powers of electrical power feeders connected at a supply node of an electrical distribution network;
- relating the feeder apparent powers with respect to a supply node active power and a supply node reactive power, wherein the relating is defined by the following system of equations:
- Pinj=S1 cos φ1+S2 cos φ2+S3 cos φ3+ . . . +Sn cos φn
- Qinj=S1 sin φ1+S2 sin φ2+S3 sin φ3+ . . . +Sn sin φn,
- wherein n is a positive integer that represents a number of feeders, φn represents a power factor angle for an nth feeder, Sn represents apparent power for the nth feeder with respect to injected active power Pinj and injected reactive power Qinj;
- determining a feeder power factor angle of at least one of the feeders responsive to the feeder apparent powers, the supply node active power, and the supply node reactive power;
- and
- using at least one of the feeder power factor angles for determining a power flow in the electrical distribution network.
Computer readable medium for determining a power flow in an electrical distribution network, said computer readable medium comprising computer program code that when executed by a processor causes the processor to make a determination of electrical power flow in the electrical distribution network, the computer readable medium when executed by the processor is configured:
- to determine respective feeder apparent powers of electrical power feeders connected at a supply node of an electrical distribution network;
- to relate the feeder apparent powers with respect to a supply node active power and a supply node reactive power based on the following system of equations:
- Pinj=S1 cos φ1+S2 cos φ2+S3 cos φ3+ . . . +Sn cos φn
- Qinj=S1 sin φ1+S2 sin φ2+S3 sin φ3+ . . . +Sn sin φn,
- wherein n is a positive integer that represents a number of feeders, φn represents a factor angle for an nth feeder, Sn represents apparent power for the nth feeder with respect to injected active power Pinj and in injected reactive power Qinj;
- to determine a feeder power factor angle of at least one of the feeders responsive to the feeder apparent powers, the supply node active power, and the supply node reactive power;
- and
- to process at least one of the feeder power factor angles for determining a power flow in the electrical distribution network.
Dependencies are inferred from the claim text.