Advanced distribution automation application with miscoordination correction algorithm based on neural network Alexandr Stinskiy, Ph.D – SiemensChristopher Huff, P.E. - Southern California Edison

• 15 million residents in a 50,000 square mile area

• 46% energy from carbon-free sources• Joined open letter to support Paris Climate

Accord• Utility Dive “2017 Utility of the Year” for our

2017 Clean Power and Electrification Vision Plan

• Procured close to 500 MW of storageSupporting California’s 2030 greenhouse gas reduction goals

2

Southern California Edison

Remote Integrated Switch (RIS)

– Decentralized DA Application;– Advanced Automation for fault detection and

auto circuit reconfiguration;– Incorporate greater levels of telemetry to

support DERMS & GM;– Support multiple communication technology

standards;– Support various circuit topologies;– Drop-into-place solution

RIS Project Concept

TS

TS

TS

1.5 Circuit 2.5 Circuit 3.5 Circuit

RIS Extended Schemes

CB

MS1

TS3

MS2

Substation A

CB

MS5

MS4

Substation B

TS9

MS6

MS7

TS8

Substation C

TS10

CB

MS11

Substation D

MS12

TS13

Operation Examples

CB

MS1

TS3

MS2

Substation A

CB

MS5

MS4

Substation B

TS9

MS6

MS7

TS8

Substation C

TS10

CB

MS11

Substation D

MS12

TS13

RIS CommunicationLegacy NetCom Radio System– DNP Protocol– Contains ~50,000 radio nodes– Unlicensed operation

in 902-928 MHz band– 9600 bps data rate – 0.1 Watt output– Packet contains 207 byte of data– Average 20 sec. one-way latency– DNP Router Concept was introduced

Data exchange

RIS1SUB A SUB BRIS2 RIS3 RIS4 RIS5MS A1 MS A2 TS AB MS B2 MS B1

RIS Status

DNP Router

Information from every RIS is broadcasted to the rest of the system via DNP commands

Z1 Z2 Z3 Z4 Z5 Z6

900MhzNetCom System

DNP Router Concept

• Router can skip unnecessary steps in the data processing

• Flexibility by autonomously self-adjusting to system conditions

• Improves operating speed

RIS1Broad-

cast

RIS2Broad-

cast

RIS3Broad-

cast

RIS4Broad-

cast

RIS5Broad-

cast

Mode Broad-

cast

Grid Fault

P1 CommFault

P2CommFault

P4 CommFault

P5CommFault

P3 CommFault

RIS1Poll

RIS2Poll

RIS3Poll

RIS4Poll

RIS5Poll

DNP Router Concept

RIS TOC Coordination

1000

100

10

1

0.1

0.011000 10000

Time, S

Current, A

CB

SMU Fuse

1900 A Trip Release for Mid Switches

- CB settings cannot be changed;

- Narrow gap between CB curve and fuse;

- Three additional curves are required for the RIS;

- Trip release logic is introduced;

- Possible mis-coordination with CB if current is <1900A;

Miscoordination correction

CB1

MS1

TS3

MS2

CB2

MS5

MS4

Substation A Substation B

Z1

Z2

Z3 Z4

Z5

Z6

1. Remote Fault in Zone 4 with fault magnitude <1900A;

2. CB trips faster than MS2;3. CB autoreclose attempt;4. CB trip;5. MS1 operation on loss of S1;

7. MS2 operation from miscoordination logic;

6. CB autoreclose;

8. MS1 operation from miscoordination logic.

System configuration with combination based logicBenefits:- Classic approach employs multiple AND Gates verifying

system conditions;- If certain defined set of conditions is true, AND Gate issues

the operation command to open or close the primary switchgear;

Challenges:- Number of AND Gates per device exponentially grows with

number of automation points in the system;- Hard to account for all abnormal scenarios or multiple near-

simultaneous fault scenarios in the system;- All conditions and their combinations are unique for each

device which requires considerable engineering effort

System logic based on Neural Network

CB1

MS1

TS3

MS2

CB2

Substation A Substation B

MS4

MS5

System Topology

Zone 1

Zone 2

Zone 3 Zone 4

Zone 5

Zone 6

A01

A02

A03

A05

A04

Neural Network A (Forward)

B01

B02

B03

B05

B04

MS1 Control

MS2 Control

TS3 Control

MS4 Control

MS5 Control

MS1 DML MS2 DML TS3 DML MS4 DML MS5 DML

Neural Network B (Reverse)

7SC80

Automation Controllers

System logic based on Neural Network Extended Scheme

CB2

MS3

TS3

MS4

CB3

MS6

MS5

CB1

MS1

MS2

CB4

MS7

MS8

TS1

TS2

TS4

TS5

Substation A Substation B Substation C Substation DA01

A02

A03

A04

A05

A06

A07

A08

A09

A10

A11

A12

A13

B01

B02

B03

B04

B05

B06

B07

B08

B09

B10

B11

B12

B13

Testing and Validation- 1.5 Circuit Logic

156 Tests

- 2.5 Circuit Logic304 Tests

- 2.5 Ext Circuit Logic664 Tests

- 3.5 and 3.5 ExtendedUnder development

Conclusion- Performed >500 hours of RTDS testing- Pilot Deployment

- December 2016- Five locations between 2 circuits- Performed 2 operation

- Spring 2018- Added one operational group with two

circuits- Total of eight locations between 4 circuits

- Winter 2019- Adding addition circuit to group 1- 11 locations between 5 circuits

- Next demonstration phase will focus on variant with high-speed communications

Christopher Huff, P.E.

Southern California EdisonChristopher.Huff@sce.com

Thank You!

Alexandr Stinskiy, Ph.D.

Siemens Industry Alexandr.Stinskiy@siemens.com