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Distribution GIS & Grid Model Data Management Project

Feeder Fragment Import Use Case

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This use case is about the red arrow.

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In NMM, we assume distribution modeling and transmission are divided into separate frames.

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This use case describes the initial population of a distribution network analysis model in an NMM function.

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There are 4 sources of information.

Network Model Management (NMM)

Transmission& Substation Engineering

Geospatial Feeder Source

Customer Meters

DER Applications to

Connect

Feeder FragmentManual Meter Fragment DER Fragment

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We assume transmission is modeled manually, and substations look like this…

Boundary

Transmission Modeling

M M

MM

Distribution Modeling

= energy connection

= measured terminal

= real power control

= reactive control

M

= connectivity node

= breaker

= transformer

= switch

= cap bank

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A GIS source has provided these feeder fragments.

= connectivity node

= switch

Duplicated open switch

= AC line section of consistent construction

= breaker

= breaker

Duplicated open switch

Feeder A

Feeder B

Feeder C

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Boundary

Transmission Modeling

M M

MM

Distribution Modeling(as viewed by transmission)

= energy connection

= measured terminal

= real power control

= reactive control

M

= connectivity node

= breaker

= transformer

= switch

= cap bank

Frag-ment

A

Let’s walk through import of feeder fragment A.

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Boundary

Transmission Modeling

M M

MMFrag-ment

A

1. Remove parts mastered by transmission

2. Connect fragment external

reference

Fragment Import NMM Model Part

The NMM user imports the fragment & makes changes as necessary to fit the fragment into existing NMM modeling.

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Boundary

Distribution Modeling

Transmission Modeling

M M

MM

= energy connection

= measured terminal

= real power control

= reactive control

M

= connectivity node

= breaker

= transformer

= switch

= cap bank

A B C

These changes are captured as an NMM fragment update project.

The end result is an NMM update that changes the distribution modeling as shown.

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When all three fragments are processed, it looks like this.

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DER descriptions come from a source that manages applications to connect. The following fragments are ready for processing…

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Let’s add fragment 1 into its location in feeder B.

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User imports fragment and connects it into the existing modeling.

Boundary

Transmission Model Part

M M

MM

Distribution Model Part

A B C

invpv

pv

batt

m

m

Fragment 1

F1

1. Helper says to ignore metering data that is mastered from

meter fragments.

Fragment Import NMM Model Part

invpv

pv

batt

F1

invpv

pv

batt

F1

2. User connects external references into the

distribution model part.

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When all DER fragments are imported, the NMM modeling looks like this.

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Meter data is assumed to come in as fragments containing regional groupings of meters. This group happens to relate to feeder B.

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Meter Fragment Boundary

Transmission Model Part

M M

MM

Distribution Model Part

A B C

invpv

pv

batt

F1pv F2

pv F3

mmmmm

m

mm

mmm

mmmm

mm

m

mm

mmmmm

m

mm

mmm

mmmm

mm

m

mm

Fragment Import NMM Model Part

1. User connects external references into

distribution model part.

The NMM user imports fragment and completes the references from meters to equipment.

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If only a few meters change, manually completing meter references is acceptable.

However, initializing millions of meter references manually will be painful.

A special assist in NMM would be helpful here.– Use the meter location and customer transformer information to locate

the corresponding customer transformer in the NMM modeling.– Identify the low side connectivity node.– Connect customer energy connection terminal to connectivity node in the

fragment.

Completing meter references.

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The complete view of feeder B is now as shown.

Boundary

= metered location

Feeder B after meter model part is added

= connectivity node

= switch= secondary transformer

= AC line section of consistent construction

= breaker

invpv

pv

battpv

= single terminal energy connection associated to a single type of energy

pv = real / reactive control

= DER facility

= DER energy component

inv = AC/DC inverter

F1

F2F3