Massachusetts DTE DG Interconnection Collaborative Collaborative Results Restructuring Roundtable
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Massachusetts DTE DG Interconnection Collaborative Collaborative Results Restructuring Roundtable March 28, 2003
description
Massachusetts DTE DG Interconnection Collaborative Collaborative Results Restructuring Roundtable March 28, 2003. EPS. EPS. Customer. Customer. Customer. Customer. Customer. EPS. Customer Facility. Customer Facility. Customer Facility. Customer Facility. - PowerPoint PPT Presentation
Transcript of Massachusetts DTE DG Interconnection Collaborative Collaborative Results Restructuring Roundtable
Massachusetts DTEDG Interconnection Collaborative
Collaborative Results
Restructuring RoundtableMarch 28, 2003
What Is An Interconnect (Nomenclature)?
The interface between Distributed Generation (DG) equipment, (the Facility) and the grid (the area Electrical Power System or EPS)
Load3
EPS
Customer Site
Customer Facility
Customer Facility
Customer Facility
Customer Facility
EPS
DGLoad
2
Point of Common Coupling (PCC)
Load1Customer
CustomerCustomer
CustomerCustomer
EPS EPS
Network
Radial
(generating facility)
(interconnecting facility)
Collaborative Effort Has Resulted in the Creation of Four Processes
Simplified - Radial
Simplified – Network
Expedited – Radial
Standard – Radial or Network
Simplest process Minimal or no costs expected Shortest time
Still reasonably simple Strict limits Modest fees, longer time interval
Standardized process Screens / Supplemental Review technical
approach Moderate fees , longer time interval
Standardized process Similar to current process Essentially based on actual costs Potentially long time interval
Simplified Radial ProcessOne sheet application and approvalOnly three technical screens
Radial distribution systems only Limited to 10kW or less Inverter-based, UL1741 listed
Minimal or no costs expected15 business days max
Customer Submits
Application
Network or Radial
EPS?
Complete Simplified Process
>7.5% of circuit
peak load?
≤10kW Qualified Inverter?Radial Yes
To Network Process
To Supplemental Review
No
Yes
No
To Expedited Screens
Simplified Network ProcessOne sheet application and approvalAdditional technical limits
Spot network only Tighter capacity limit
$100 or $300 fee40 to 100 days max
Spot Network
Area or Grid Network
1
Substation Circuit
2
3
Secondary Bus
Loads
Primary Feeders
Transformer
Network Protector Breaker
Network Protector Fuse
Switch
CustomerCustomer
CustomerCustomer
Customer
NP NPNP
ExpeditedRadial Process
Standardized applicationFive additional technical screens
If passed, only a review of possible EPSmodifications remains
If not passed, Supplemental Reviewdetermines if application can remain inExpedited or go to Standard process
Fee range from $300 to $3,750,possible EPS upgrades40 or 60 days max
Su
pp
lem
en
tal R
evi
ew
Is Facility Certified?
Company Sends Written Authorization
Pass Starting V
Drop?
Pass Fault
Contrib?
Yes
Yes
No
No
No
Pass Config.
Screen?
Yes
No
Pass Trans.
Stability?
Yes
No
Suppl. Review
Determine Req.?
EPS Modification
Check
Yes
Yes
To Standard ProcessNo
Company makes EPS
Modifications
Customer Installs Facility
Optional Witness Test
(If required)
Basis For ScreensCircuit size versus DG
size
DG contribution to fault
Short circuit interrupting capability limit
Three-wire and four-wire circuit criteria
Nameplate limits
Circuit impact
Fault handling, fuse desensitizing & nuisance trip
Short circuit handling
Proper connection
Single phase imbalance
Standard Review ProcessStandardized applicationInitial review
Initial review Impact study if required Facility study if required
Fee range from $300 to actualcosts (no limit)125 or 150 days max
initial review
Facilities Study if required
Company Sends Written Authorization
Company makes EPS
Modifications
Customer Installs Facility
Optional Witness Test
(If required)
optional scoping meeting
Impact Study if required
Process InReport Customer submits complete application and application fee
1. Is the Point of Common Coupling on a Radial Distribution System?
Go to Figure 2No
2. Is the aggregate generating Facility capacity on the circuit less than 7.5% of circuit annual peak load?
3. Does the facility use a Qualified Inverter with a power rating of 10 kW or less?
Customer opts for Standard Process
Yes
Does the facility pass all the following screens?4. Is the Facility certified?5. Is the Starting Voltage Drop Screen met?6. Is the Fault Current Contribution Screen met?7. Is the Service Configuration Screen met?8. Is the Transient Stability Screen met?
No
PerformSupplemental
ReviewYes
No
No
InitiateStandard
Process initial review
Does Supplemental Review determine requirements?
System Modification Check
Yes
Company provides cost estimate and schedule for Interconnection Study(ies)
Company performs Impact and Facility (if required) Study
Customer accepts
Facility Processed forSimplified Interconnection
Under DG Tariff
Facility Processed forExpedited Interconnection
Under DG Tariff
Facility Processed forStandard Interconnection
Under DG Tariff
Yes
NoYes
Simplified Process For Networks
Is the Point of Common Coupling on a spot network?
Does the facility use a Qualified Inverter? (UL1741)
Yes
Initiate Standard process
System Modification Check
Facility Processed for Simplified Interconnection Under DG Tariff
No
Yes
Is the Facility 10kW or less?
Yes
Is the aggregate generating Facility capacity less than1/15 of Customer’s minimum load?
Yes
No
No
No
Yes
Minimum Technical Requirements Set By
IEEE P1547 – “Draft Standard for Distributed Resources Interconnected with Electric Power Systems”.Underwriters Laboratories Inc. Standard UL 1741, November 1, 2002 “Inverters, Converters and Charge Controllers for Use in Independent Power SystemsIEEE 929-2000, “IEEE Recommended Practice for Utility Interface of Photovoltaic (PV) Systems.”
IEEE Std P1547 Key ClausesVoltage regulationIntegration with EPS groundingSynchronizationSurge WithstandResponse to EPS abnormal conditionsResponse to EPS faultsEPS reclosing coordinationVoltage detection and limitsFrequency detection and limits
Reconnection to EPSLimitation of FlickerHarmonicsUnintentional islandingDesign testingCommissioning testing
Additional Technical Requirements
For Facilities qualified for Simplified Process Must be “qualified” to UL 1741 Disconnect switch may be required
For Facilities >10kW: Non-export functionality if not allowed to export Disconnect switch or comparable device Possible NPCC criteria
For Facilities with rotating generators Interrupting Device (ID) Synchronizing Device (could be part of ID) Additional protection equipment requirements
For large Facilities Transfer trip? High speed protection Communications channels Reactive capability
(Note: Tariff also covers standby gensets that momentary parallel)
Fee Schedules
Simplified Expedited Standard Simplified Spot Network
Application Fee (covers screens)
0 $3/kW,minimum $300,
maximum $2,500
$3/kW,minimum $300,
maximum $2,500
≤ 3kW $100,> 3kW $300
Supplemental Review or Additional Review (if applicable)
N/a Up to 10 engineering hours at $125/hr ($1,250
maximum)
N/a N/a
Standard Interconnection Initial Review
N/a N/a Included in application fee (if
applicable)
N/a
Impact and Facility Study (if required)
N/a N/a Actual cost N/a
Facility Upgrades N/a Actual cost Actual cost N/a
O and M N/a TBD TBD N/a
Witness Test 0 Actual cost, up to $300 + travel time
Actual cost 0
Qualified Inverter≤ 10 kW
Qualified DG Any DG Qualified Inverter≤ 10 kW
Maximum Time Lines
Simplified Expedited Standard Simplified Spot Network
Acknowledge Receipt of Application
(3 days) (3 days) (3 days) (3 days)
Review Application for Completeness
10 days 10 days 10 days 10 days
Complete Review of All Screens
10 days 25 days N/a Site review 30/90 days
Complete Supplemental Review (if needed)
N/a 20 days N/a N/a
Complete Standard Process Initial Review
N/a N/a 20 days N/a
Send Follow-on Studies Cost/Agreement
N/a N/a 5 days N/a
Complete Impact Study (if needed)
N/a N/a 55 days N/a
Complete Facility Study (if needed)
N/a N/a 30 days N/a
Send Executable Agreement
Done 10 days 15 days Done
Total Maximum Days 15 days 40/60 days 125/150 days 40/100 days
Notice/ Witness Test <1 day with 10 day notice or by mutual
agreement
1-2 days with 10 day notice or by
mutual agreement
By mutual agreement
1 day with 10 day notice or by mutual
agreement
Qualified Inverter≤ 10 kW
Qualified DG Any DG Qualified Inverter≤ 10 kW
Application Process
Prior NoticeOne Point of ContactApplication submittalReview Load flow and Voltage constraints Short Circuit and Protection review
System Modification ReviewAgreement
Application InformationGeneral (Single) or Specific Form?Simplified process (Inverter)
Applicant contact information Location of generator Proof of UL1741
Others Application contact information Location of generator Machine technical data Proposed drawings
Massachusetts Company Contacts
Boston Edison, Cambridge Electric, Com Electric (NStar Electric) Frank Gundal Tel: (781) 441-8151 Email: [email protected]
Fitchburg Gas & Electric (Unitil) John Bonazoli P.E. Tel: (603) 773-6456 e-mail: [email protected]
Massachusetts Electric Co. (National Grid) John J. Bzura, Ph.D., P.E., M.B.A. Tel: (508) 421-7642 e-mail: [email protected]
Western Massachusetts Electric ( Northeast Utilities) Doug Clarke Tel: 413-585-1726 Email: [email protected]
Why is DG Different?Traditional System
Trans. Sta
Gen Gen
Trans. Sta Trans. Sta
Load Load
Trans. Sta Trans. Substa Trans. Sta
Gen Gen
Load Load
Load Load
Distributed Generation
Load Gen
Load Load
Gen Gen
Trans. Substa Trans. StaTrans. Sta
Gen Gen
Gen
Trans. Sta
Gen
Trans. Sta Trans. Sta
How Does DG Affect Distribution Companies?
Protection Generator Protection Coordination
Reliability EffectsPlanning Procedures Peak Load Planning Firm Capacity
Interconnection Process Advantages
Standard Process Easier planning for customer More Efficient with time Less time Consuming
Consistent FeesKnown Costs to customerKnown Process for customer
Challenges for Distribution Company
General Requirements Interpretations Analysis of compliance
Testing Requirements New devices
Time Lines Reports Interconnection agreement
Future Efforts
Quarterly Collaborative Meetings Interconnection updates Numbers of projects and applications
Annual Documentation sharing Detailed process information
Process Adjustments as needed
Upcoming Tariff Document1.0 Introduction2.0 Responsibility of the Parties3.0 Process Overview4.0 Interconnection Req.5.0 General Operating Req.6.0 Metering, Monitoring, and Communication7.0 Responsibility For Costs of Interconnecting a Facility8.0 Dispute Resolution Process9.0 Confidentiality Statement10.0 Insurance Req.
Exhibit A – Interconnection Service Agreement templateExhibit B – Third Party Owner AgreementExhibit C – Simplified ApplicationExhibit D – Expedited/Standard ApplicationExhibit E – Supplemental Review AgreementExhibit F – Impact Study AgreementExhibit G – Facility Study AgreementExhibit H – Qualifying Facilities
Discussed already, from Collab. report, or new effort
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