Distribution Generation Connection Impact Assessments

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Distribution Generation Connection Impact Assessments

Distribution Generation

Connection Impact

Assessments

John Fuerth,

Jan 22 nd, 2009

Distributed Generation

Connection Planning Manager


Presentation Overview

1. 60% Rule

2. 400 Amp Rule

3. Short Circuit and Capability

4. Lack of Data

5. Changes to Data

6. Responsiveness

7. SIA

8. SIA Threshold for Solar Generation


Process

Proponent submits

CIA application

Technical

Review

YES

Eligible CIA CCRA

NO

CIA – Connection Impact Assessment

CCRA – Connection and Cost Recovery Agreement


Distribution Connection

Progress

*

*Based on Hydro One’s current technical thresholds


60% Rule

Ineligible due to 60% Rule


60% Rule

Current State

Reverse Power shall not exceed 60% capability of 1

transformer at 2 transformer station

Preferred State

Hydro One considers options to relax this limitation

Options

May require equipment upgrades, such as generation

rejection


400 Amp Rule

Ineligible due to 400 Amp rule


400 Amp Rule

Current State

Preferred State

Options

Power flow through any line section cannot

exceed 400 amps

This restriction is based on system operation

requirements and it continues to be a

necessity

Not applicable


Short Circuit Capability

Ineligible Due to Short Circuit Capability


Short Circuit Capability

• At the station the SC levels cannot be increased based on limits

of Appendix 2 of the Transmission System Code

• Maximum fault levels at station, limited equipment rating

(Appendix 2)

• For phase-ground short circuit, generators are able to pay for

change in neutral grounding reactor

• For three phase short circuits, the required upgrades are too

complex and costly


Short Circuit Capability

Current

State

Preferred

State

Generators restricted if three-phase short circuit at limit

Hydro One is considering options to relax this limitation

if generator’s short circuit contribution is a fraction of 1

cycle

Options

To assume no short-circuit contribution from any

inverter / converter type of generator. Generator to

provide proof of duration of short circuit contribution.


Lack of Complete Data Or

Application Revisions

• With respect to addressing the backlog of CIAs

Current State

Preferred State

Options

One-third of the CIAs are reworks

Delays result from process inefficiencies

To minimize reworks and to speed up CIA

process

Benefits to All


Responsiveness

• Lack of responsiveness results in delayed CIA work and adversely

impacts subsequent queue projects

• In extreme cases, where a project is blocking other projects from

moving forward, we will try to enforce a deadline or queue position

may be jeopardised

?


SIA

Current State

IESO is doing SIA and identifying requirement. If

reverse flow >10 MW , typically SIA recommends

dynamic VARS support

Preferred State

SIA is necessary for system stability

The planning for dynamic VARS support needs to

done efficiently and effectively

Options

Hydro One and IESO to develop plan for dynamic

VARS support (Naren Pattani presentation)


SIA Threshold for Solar

Generation

Current State

• To use minimum regardless of day / night time

• Solar generation have voiced concerns that day

time minimum should be higher than night time

minimum

Preferred State

Hydro One is considering the possibility of using day

time minimums for solar projects only

Options

To develop a more sophisticated assessment of

reverse flow for solar projects only

Note :

1) At some TS day minimum is lower than night minimum

2) Depending on queue position this may require SIA irrespective of minimum

load


MUSKOKA STATION LOAD

Weekday :

Night Minimum / Day Peak = 0.768

Day minimum / Day Peak = 0.874


Thank You

John Fuerth,

Distributed Generation

Connection Planning Manager

Jan 22 nd, 2009

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