US 2018/0321650 A1Published application

Ami based volt-var optimization using online model learing

AssigneeABB Schweiz AG

InventorsXiaoming Feng, Ning Kang

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Abstract

The present application relates generally to Volt-VAR optimization for power distribution systems having advanced metering infrastructure (AMI). Distributed energy resources (DER) such as photovoltaic arrays are becoming prevalent in distribution systems. These DER systems inject power into the distribution system which can cause unfavorable changes, such as a rise in voltage across the feeder lines of the distribution system. Existing control proposals stiffer from a number of shortcomings, drawbacks and disadvantages. In some instances, traditional controllers for distribution systems with DER systems may require information related to the arrangement of the distribution system which is unknown and cannot be provided by the advanced metering infrastructure. There remains a significant need for the apparatuses, methods, systems and techniques disclosed herein.

Claims20

Dependent claims

A power device controller for controlling a power distribution system having at least one feeder, at least one electromechanical device and at least one distributed energy resource without using a power flow model, the controller comprising:

a communication transceiver structured to receive electrical measurements from a plurality of electronic power meters, the transceiver additionally structured to transmit perturbation signals to the at least one electromechanical device, and the transceiver additionally structured to transmit control signals to the at least one electromechanical device and at least one distributed energy resource;
a memory device structured to store electrical measurements received by the communication transceiver;
and
a processing unit structured to receive electrical measurements from the communication transceiver, transmit perturbation signals and control signals to the communication transceiver, receive data stored on the memory device, transmit data to the memory device to be stored, and programmed to:
receive historical measurements generated by the plurality of electronic power meters and electromechanical devices,
determine the sensitivities of system voltages over the change in aggregate real power consumption, aggregate reactive power consumption, aggregate distributed energy resource real power generation, and aggregate distributed energy resource reactive power generation, switched capacitor bank reactive power generation and voltage regulator tap position,
identify a predictive model based on the determined voltage sensitivities, and
transmit at least one command signal to the communication transceiver, each command signal being structured to modify power line characteristics by controlling a setting of one of the electromechanical devices or one setting of the distributed energy resources.

5 more elements

A power distribution system comprising:

a distribution substation:
a feeder power line electrically coupled with the distribution substation;
at least one lateral power line electrically coupled with the feeder line;
at least one secondary power line electrically coupled with the at least one of the lateral power lines;
at least one switched capacitor bank electrically coupled with at least one of the feeder power line, one of the lateral power lines, and one of the secondary power lines;
at least one voltage regulator electrically coupled with at least one of the feeder power line, one of the lateral power lines, and one of the secondary power lines;
at least one load system electrically coupled with the respective feeder power line, lateral power line or secondary power line, the load system including an electronic power meter electrically coupled with the respective feeder power line, lateral power lines or secondary power lines, and an distributed energy resource electrically coupled with each electronic power meter;
and
a central electronic control system in operative communication with the switched capacitor banks, the voltage regulators, and the distributed energy resources, the central electronic control system being structured to
determine a plurality of commands including switching commands for the switched capacitors, tap position commands for the voltage regulators, and power factor commands for the distributed energy resources, using a model predictive controller structured to determine the plurality of control commands based upon a predicted aggregate real power demand of the entire feeder, a predicted aggregate reactive power demand of the entire feeder, a predicted aggregate real power generation of the distributed energy resources, a sensitivity matrix, and the predicted real power demand uncertainty range, and
transmit the switching commands to the switched capacitors, the tap position control signals to the voltage regulators and the power factor control signals to the distributed energy resource devices.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/971,655Filed 4 May 2018
Priority: 9 Nov 2015
Published: 8 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

H02J 13/333
Characterised by the remotely-controlled equipment, e.g. converters or transformers: the equipment forming part of substations
G05B 19/042
Program control other than numerical control, i.e. in sequence controllers or logic controllers: using digital processors
H02J 3/00
Circuit arrangements for ac mains or ac distribution networks
H02J 3/16
Arrangements for adjusting voltage in AC networks by changing a characteristic of the network load: by adjustment of reactive power