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INNOVATIVE THINKING FOR THE REAL WORLD Advanced Grid Connection Workshop The Innovation Centre, Sci-Tech Daresbury, 16 th July 2013 Welcome and Introduction George Hall, Project Manager The Wind-Tech Project
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Advanced grid connection workshop 16 07 13 presentation

Sep 05, 2014

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Page 1: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Advanced

Grid Connection Workshop

The Innovation Centre, Sci-Tech Daresbury, 16th July 2013 Welcome and Introduction George Hall, Project Manager The Wind-Tech Project

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INNOVATIVE THINKING FOR THE REAL WORLD

Programme 9.00 Welcome & introduction Dr. George Hall, Wind-Tech Project, UCLan 9.10 Introduction to the workshop 9.20 Part 1: Variation in grid voltage and the need for DNO studies 9.50 Part 2: The rural grid in detail: Schematic diagrams for most rural connections 10.45 Morning Refreshments 11.00 Exercise 1: Completing a site survey for an example PV, hydro or wind project 12.00 Part 3: Larger grid connection projects and case studies Geoff Owen, Grid Connections 12.30 Lunch 1.30 Part 3: Larger grid connection projects and case studies (continued) 2.00 Part 4: Additional grid connection

2.45 Afternoon refreshments 3.00 Exercise 2: Completing the ENA application form for an example project Geoff Owen 4.30 Summary and surgery: one-to-one advice Geoff Owen, Dr. George Hall

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INNOVATIVE THINKING FOR THE REAL WORLD

Today’s workshop • Following the energy and grid connection basics workshop, today

we will investigate in more detail the complexity of connecting to the grid;

• A more interactive workshop, with morning and afternoon group

exercises, with support from the Wind-Tech team;

• Follow-on support from the Wind-Tech team for companies interested in wind turbine technologies, or other forms of renewable technology, available after today’s workshop.

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INNOVATIVE THINKING FOR THE REAL WORLD

Today’s workshop Please note: The information provided today is done so in an advisory capacity only. The supplier shall not incur any liability for any action or omission arising out of any reliance being placed on this information by any organisation or other person. Any organisation or person in receipt of this information should take their own legal, financial and other relevant professional advice when considering what action (if any) to take in respect of any grid connection, renewable strategy, initiative, proposal, or other involvement with any renewable technology, before placing any reliance on anything contained herein.

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INNOVATIVE THINKING FOR THE REAL WORLD

Advanced

Grid Connection Workshop

16th July 2013 Geoff Owen, Grid Connections

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INNOVATIVE THINKING FOR THE REAL WORLD

Level 1 review • Essential power terminology & application for renewable

generation projects

• G83 is under 16 amp per phase

• G59 is over 16 amps per phase

• One G83 project is allowed per customer

• Once a G83 project is fitted to increase or add another project will require a G59 application & permission from the DNO

• The function of the DNO grid and connections

• Application and upstanding grid connectivity for renewable energy projects

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LEVEL 2 Workshop Content

Part 1: Variation in grid voltage and the reason for DNO studies

Part 2: The rural grid in detail

Exercise 1: Completing a site survey

Part 3: Larger grid connection projects and case studies

Part 4: Additional grid connection considerations

Exercise 2: Completing the ENA application form for an example project

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Renewable power generation Essential considerations for projects

• If there is no consumer demand then there is limited justification to install a generation project

• The Availability of FIT support will not be there for long

• The installation of renewable power technologies enables consumers to take control of their energy costs and limit their exposure to future price increases.

• De-centralised power generation can reduce transmission grid losses.

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Part 1: Variation in grid voltage and the need for DNO studies

• For a generator to work and stay connected it must operate within design parameters

• G83 upper cut of voltage stage 1 (@51.5HZ) 262.2 volts in 90 seconds

• G59 upper cut of voltage stage 1 (@51.5HZ) 253 volts in 90 seconds

• The grid supply transformer is set at 250 volts at the source, this allows a head room of only 3 volts

• In periods of low customer load the grid volts are high through out the grid system, generation may increase the grid voltage resulting in invertors and protection relays operating with loss of generation, and Grid voltage pushed beyond statutory levels

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Why is the Grid connection process so complicated?

• Grid systems were never designed for multiple smaller generation connections, designed for power flow in one direction

• DNO’s have to guarantee to the customers the quality of supply and availability 24/7

• Increasing number of projects could result in a unstable Grid system, with undermining of network supply security

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DNO Responsibilities

These are the statutory obligations under the terms of their licence

• Secure operation and development of the network;

• Safe & reliable operation of the network;

• Ensure fair and equal access to the network;

• Least cost options for connection;

• Lifetime ownership of network not just your connection.

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Grid voltage variation

• The voltage level in the UK was standardised with the EU

• The DNO is responsible for the supply characteristics and is directly responsible for guaranteeing the supply quality to all customers

• The supply characteristics are declared as 400/230 volts (+10% to -6%), 50Hz damage to electrical equipment will result if the if the supply voltage goes outside of the stated range

• Customer switches on large motor

• G83 or G59 nuisance tripping Grid transformer output set at 250/433 volts

Maximum 253 volts

Minimum 216 volts

Low customer load

high customer load

Normal grid 240 volts

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DNO’s EXISTING ELECTRICITY NETWORK (LV grid)

Small single phase cable to house

Small 3 phase Commercial supply

3 C 300 mm W cable in pathway or road

Large 3 phase Commercial supply

DNO designs infrastructure connections to guarantee the supply quality

Cable joints in highway

Voltage at source set 250/433 volts

Supplying Sub station

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Voltage variation data with customer load for proposed G83 generation

Day 1 Day 2 Day 3

252 volts

244 volts

Peak 254 volts

Switching on of motor load

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Frequency variation data with customer load for proposed G83 generation

Day 1 Day 2 Day 3

50.3

50.18.

50.06

49.94

49.82

49.7

Hz

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INNOVATIVE THINKING FOR THE REAL WORLD

Part 2: The rural grid in detail

Introduction to the complexity and schematic view of most rural connection arrangements

for projects < 50kW

Warning Excludes non-standard DNO supply systems that are awaiting a

system upgrade

Will the grid connection cost undermine the F.I.T/energy reduction investment return?

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INNOVATIVE THINKING FOR THE REAL WORLD INNOVATIVE THINKING FOR THE REAL WORLD

Essential Information

Supplied by sustainable Energy Eystems

Installer of over 300 small WT’s in the last 5 years

What you must have

• Good healthy DNO supply

• Single phase or 3 phase

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INNOVATIVE THINKING FOR THE REAL WORLD INNOVATIVE THINKING FOR THE REAL WORLD

Examples of poor connection capability

• More than one property run

from the transformer

• End of line connection

• Long distance to three phase line

• Low on site usage

• Old supply transformer

• High voltage tapings on the supply transformer

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Rural supplies • 70 % of rural areas have a single phase supply

system

• A technical assessment must be made before any applications are submitted to the DNO

• A project must initially have view of the likely GRID connectivity and costs

• Submit a budgetary request to the DNO for indicative costs

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Rural overhead line supplies & grid connectivity

HV 3 phase supply

Transformer HV to LV single phase

Single phase LV supply to a farm

• This supply arrangement provides single phase to the customer

• MCS generator project connectivity is 3.68kW

• Cost to upgrade for 3 phase if pole is suitable (£6k to £15k)

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70% of rural overhead line supplies are single phase only

HV 2 phase supply

DNO HV/LV transformer

• This supply arrangement can only provide single phase to the customer

• MCS generator project connectivity is 3.68kW

• Cost to upgrade to 3 phase, with a new pole transformer = £18k

• New lines and poles = £80 = £120/m

Single phase supply to customer

Substation name and pole number

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Connectivity for single phase rural grid supplies with one customer

1 Customer

Small LV grid cables

G 83

generator

• Installed under G83

• May require later DNO grid upgrade High voltage

lines

Proposed 3.68 kW single phase WT

Single phase LV grid cable

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INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single phase rural grid supplies to one customer

Customer no 1

Small LV grid cables

G 59

generator

High voltage lines

Proposed >11 kW < 50 kW single phase WT

• G59 application to DNO • Installed under G59 • DNO grid upgrade & costs to connect

Single phase LV grid Cable

Page 24: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single phase rural grid supplies with more than one customer

Customer no. 1

Customer no. 3

Customer no. 2

Small LV 3 phase grid cable

G 83

generator

• Single phase installed under G83 maximum of 3.68 kW

• May require later DNO grid upgrade

High voltage

lines

Single phase LV grid cables

Page 25: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single phase rural grid supplies with more than one customer

Customer no 1

Customer no 3

Customer no 2

Small LV single phase grid cables

G 59

generator

• G59 application to DNO with technical details

• With DNO’s agreement installed under G83

maximum output 3.68 kW

• May attract DNO grid upgrade costs

High voltage

lines

Proposed 5 kW WT limited to ( 3.68 kW output)

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INNOVATIVE THINKING FOR THE REAL WORLD

Rural Case Study Grid upgrade costs for exceeding 16 amps

• Evance 9000 installed in Rossendale

• Planning submitted and passed

• Application submitted to DNO for connection of 5 kw

• Grid costs excessive £ 20,000

• Technical agreement with DNO to cap turbine output to 3.6kW – nil cost

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INNOVATIVE THINKING FOR THE REAL WORLD

New S/S for

customer no 2

Connectivity for single phase rural grid supplies

Customer no 1

Customer no 3

Customer no 2

G 59

generator

• G59 application to DNO

• installed under G 59

• DNO grid upgrade & costs to connect

High voltage lines

Proposed 10 kW to 50 kW single phase WT

Single phase LV grid cables

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INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for split phase rural grid supplies with more than one customer

Customer no 2

Customer no 1

Has 2 x 1 phase supplies

Small LV grid cables

G 83

generator

• 1x3.68 kW project installed under G83

• A second project will require G83 stage 2 application to DNO

High voltage

lines

Proposed 3.68 kW single phase WT

Split ( single) phase LV grid cable

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Single (split) or three phase ?

• In a rural area if there is any doubt

• Competent electrician to carry out voltage test a the source of the supply on the customers side

• Contact the DNO

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Overhead supply with three phase transformer

HV 3 phase supply

Transformer HV to LV 3 phase

Overhead LV 3 phase supply to customer

• Maximum rated capacity 50KVA (approx 70 amps per phase)

• MCS generator project connectivity is 11kW

• Exceeding 11 kW will require connection approval from the DNO

Page 31: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for 3 phase rural grid supplies to one customer

Customer no 1

G 83

generator

High voltage lines

Proposed 11 kW 3phase WT

3 phase LV grid cable

Installed under G83 May require later DNO grid upgrade

Page 32: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for 3 phase rural grid supplies to one customer

Customer no 1

G 59

generator

• G59 Application to DNO

• Installed under G 59

• Grid upgrade & costs to connect

High voltage lines

Proposed >11 kW <50kW 3phase WT

3 phase LV grid cable

Page 33: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single/3 phase rural grid supplies with more than one customer

Customer no 1

Customer no 3

Customer no 2

G 59

generator

• G59 Application to DNO

• Installed under G 59

• Grid upgrade to connect

High voltage lines

New S/S for

customer no 2

Proposed >11 kW < 50 kW 3 phase WT

3 phase LV grid cable

Page 34: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single/3 phase rural grid supplies with more than one customer

Customer no 1

Customer no 3

Customer no 2

Small LV grid cables

G 83

generator

• Installed under G83

• May require later DNO grid upgrade

High voltage

lines

Proposed 3.68 kW single phase WT

3 phase LV grid cable

Page 35: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single/3 phase rural grid supplies with more than one customer

Customer no 1

Customer no 3

Customer no 2

3 phase LV grid cable

G 83

generator

• Request to DNO to upgrade supply customer supply

from 1 phase to 3 phase ( from £1,500 to £ 4,500)

• Installed under G83

• May require later DNO grid upgrade to transformer

High voltage

lines

Proposed 11 kW 3 phase WT

Single phase grid service cable to

customer

Page 36: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Connectivity for single/3 phase rural grid supplies with more than one customer

Customer no 1

Customer no 3

Customer no 2

G 59

generator

• G59 Application to DNO

• Installed under G 59

• Grid upgrade to connect

High voltage lines

New S/S for customer no 2

Proposed >11 kW < 50 kW 3 phase WT

3 phase LV grid cable

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INNOVATIVE THINKING FOR THE REAL WORLD

Larger rural supplies The H pole

Maximum size of grid transformer 200kVA feeding • Dedicated customers •Several costumers in one area • MCS generator project connectivity is 11kW ( or 3.68kW for single phase supplies) •Exceeding 11 kW will require connection

approval from the DNO

Larger generator projects will require permission from the DNO to connect

11KV DNO grid

240/415 volt LV grid to customers

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Firm grid connection quotation • Will include:

– Connection permission

– Terms and conditions specific to the project

– Any connection costs

– Legal work if required

• On acceptance, the project work can commence

– You can install the project to the submitted design

– You must follow G83 & G59 Compliance stages

– You must complete the test and commissioning stages.

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Case Study Small Hydro G59 connection

Small 15kW hydro project in a remote valley

• Refer to site map for further information

• Large valley with no 3 phase grid supply

• A technical solution agreed with the DNO

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INNOVATIVE THINKING FOR THE REAL WORLD

Case Study Rural location: 10kWp School project

The Project • Grid supply looks like it is 3 phase • Installation has 3 phase TP/N switch fuse • Sales person secured a 10 kWp PV array contract • PV panels and inverters were installed • Electrician was sent to complete the connection

to G83 standards The issue • The electrician discovered that the supply was

actually 3 x single phase supplies • The incoming overhead grid lines to the grid

distribution transformer only have 2 cables. • There is no 3 phase supply in the area The Solution • They submitted G83/2 application requesting

permission to connect multiple projects.

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Case Study Two incoming HV lines supplying village

No 3 phase supply

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INNOVATIVE THINKING FOR THE REAL WORLD

Case Study Two incoming HV lines supplying village

No 3 phase supply

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Do’s • Have a view of what is involved

• Carry out a detailed site survey

• Understand the potential connection costs

• Make the right decisions, at the right time

Dont’s • Ignore grid connection

• Leave it to the last minute

• Make assumptions

• Request a firm grid connection offer until you are in a position to accept

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Break time

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INNOVATIVE THINKING FOR THE REAL WORLD

Exercise 1: Completing a site survey Group exercise with feedback and discussion

• You are going to a site, to undertake a survey for a renewable energy project.

• Maximum of three groups

• List what you think you need to consider when undertaking this site survey…

1. 50kW hydro 3 phase generator

2. 150 kW peak PV solar

3. G83 or G59 WT generation

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Site Survey 1 Proposed 50kW Hydro project: The Weir

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Site Survey 2: Burnley College 150 kW peak PV solar

Proposed PV 150 kWp project

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Site Survey 3 Proposed 2 x 11 kW Gaia turbines

The project:

Green Farm

Existing supply

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Part 3

large power connections

Have a view of what is involved

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The UK Grid layout Provides a network of cables and substations to transport power

to customers

National grid transmission 400kV

Bulk supply

point to DNO

132 kV

Primary Grid

supply into areas

33kV 66kV

Area

distribution

6.6kV11kV

Automatic connected network

Power Station

Manual connected network

Large

customers

supplies

Domestic and small industrial supplies

Power

stations

network

connected

240/415 volts

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Other considerations • Network capacity issues

• Connection capacity race

• Technical, design for firm grid application, correct choice of generator , thermal limits, voltage limits, reverse power flow, switch gear rating and fault levels, protection arrangements, power quality , earthing stability ,

• Competent design /experienced consultants

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INNOVATIVE THINKING FOR THE REAL WORLD

Grid connection project planning

1. Planning information phase

2. Detailed design phase

3. Construction phase

4. Compliance and commissioning stage

Budgetary/indicative quotation from DNO

Permission and costs to connect Identifying a suitable site

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New NHS build Ashton

Case study

Non contestable & contestable Grid costs

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The I.C.P?

• Independent connection provider

• Lloyds registered to carry out contestable grid works that will be finally adopted by the DNO

• May be able to carry out design work for you project and project manage on you behalf

• Will apply for a Point of connection form the DNO and the non contestable costs

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Grid connection options Grid connections are split into two

• Non contestable work – the work only the DNO or his registered contractor can do

• Contestable work – The work that is open to competition that any Lloyds registered I.C.P can do, on completion will be adopted by the DNO

Choice • Use the DNO for all the Grid connection work and an experienced

Grid engineer for the testing and compliance stages of the project

• Use an I.C.P to complete the contestable work and project manage all the other requirements

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Non contestable & contestable works

DNO existing 11kV cable

Non-contestable Work

Final HV joint

Network study and all design approvals

Contestable work

New DNO HV S/S

New HV cable

Customer s HV cable

To next substation

This one cable connection to the existing grid is called a TEE or unsecured connection

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Non-contestable & contestable works

DNO existing 11kV cable

Non-contestable Work

Final HV joints

Network study and all design approvals

Contestable work

New DNO HV S/S

Customer’s HV cable

This cable connection to the existing grid is called a LOOPED or secured firm connection

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Larger single turbine –225kW The project:

• In pre-planning stages

• 1 x ASCA 225kW turbine

• Hub height 32m / Blade diameter 28m / Tip height 46m

The Benefits:

• F.I.T. payment

The grid connection process:

• Rural location

• Grid connection point - 450m from preferred turbine location

• In file - Grid connection budgetary quote - £168K

• Final – Grid connection £ 168,000

• Update – delayed due to planning consents

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Site layout

Proposed site of turbine

Incoming 6,600 volt overhead

Grid line

Incoming 6,600 volt overhead Grid line

Brown cables are low voltage

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Extract from Electricity Northwest’s

budgetary quote This shows the proposed

connection plan

• The Map shows the proposed route to connect the turbine to the grid

• A new substation and

cables would be required

• Cables would follow the road rather than cross agricultural fields

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2.25 MW turbine project 3 x 750 kW turbines

The project:

• 3 Turbines on farm near Chorley

• Total project installation costs - approx £2.5M

The Benefits:

• F.I.T / R.O.C payment

The grid connection process:

• Rural location

• Grid connection point 1.2km from site

• Need to access 3rd party land to reach grid connection

point

• Grid connection cost £227k (approx 10% of installation

cost)

• DNO non–contestable - £26,000

• DNO–contestable - £201,000

• I.C.P- contestable - £119,000, excludes legal costs

• Delays caused by ongoing negotiations with 3rd party

land owner land access payment

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Connection options

Difficult negotiations with 3rd party

landowner

Project considered connecting to the

passing 33,000 volts system .

DNO non contestable estimate £345,864

DNO contestable estimate £387,803

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Greenacres Farm 300kW AD plant

Greenacres Farm 300kW AD plant

18 months of planning and investment commitment

Agricultural consultant involved

Option no 1 for 300 kW of AD generation

• Initial budgetary Grid quote of £100,000

• non-contestable cost of £10,000

Option no 2 for 600kW of AD generation

• The connection cost remained the same but the extra upgrade works on the system to allow more generation were estimated at £251,000

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The basic Grid connection issues

for each Project

• Is there a Grid connection at a cost that the project can afford ?

What other issues do I have to consider? • Site location of new DNO Substation • Permission & cost to lay new DNO cables on 3rd

party land • Grid connection options

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Connections have commercial risk

• Actual connection capacity can only be secured when accepting a firm offer, and is subject to terms and conditions

• Outstanding offers can become interactive

• Grid systems are dynamic

• In some areas larger projects >5MW may be in a queue or waiting for connection room on the grid to become available.

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Approximate Connection delivery times

• 415 volt ( 3-phase) 2 months

• 11 kV 6 months

• 33 kV >12 months

• 66kV/132kV > 18 months

• 132kV upwards & NGT level

Legal works can take 3 to 12 months to complete

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Part 4: Additional grid connection considerations

1. I.D.N.O & mpan no’s

2. Power factor

3. 3 phase power calculation

4. Fault levels

5. Likely grid connection costs

6. G59 testing & Commissioning

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MPAN numbers Identifying the DNO

• MPAN (Meter Point Administration Number)

• This is found on the electricity bill issued by the supplier

• The full MPAN is 21 digits and should be printed in the format as shown on a recent electricity bill

www.energylinx.co.uk/mpan.htm

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The Distribution Network Owner

•Establishes and maintains Electricity Distribution connections to its customers – first for load, and more recently generation • Does not make, own, buy or sell electricity, though other parts of the groups may

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From electricity board to DNO’s Takeovers, mergers and acquisitions

MPAN ID Previous name Recent name 11 East Midlands Electricity Central Networks E.ON

14 Midlands Electricity

12 London Electricity

19 The SEE board EDF now UK Power Networks

10 Eastern Electricity

13 Manweb Scottish Power SP Energy Networks

18 Scottish Power

16 Norweb (UU) Electricity North West

17 Scottish Hydro Electric Scottish & Southern Energy now

20 Southern Electric SSE Power Distribution

21 South Wales Electricity Western Power Distribution

22 South western Electricity

15 Northern Electricity CE Electric (YEDL NEDL) now

23 Yorkshire Electricity Northern Power Grid

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IDNO Independent Distribution Network Operators

They own cables and substations inside of a DNO’s geological area

ID Name Licensee

24 Envoy Independent Power Networks

25 ESP ESP Electricity

26 Energetics Global Utilities Connections (electric)Ltd

27 GTC The Electricity Network Company Ltd.

28 EDF IDNO UK Power Network (IDNO) Ltd

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What is power factor and kVar?

The grid supplies the customer

with 500 kVa = 721 line amps

Customers peak

consumption 400kW

= 557 Line amps Reactive energy

300 kVar

= 443 Line amps

Pf = 400/500

= 0.8 = 36 degrees

Increase the Pf to 0.9

= 25 degrees

500kVa reduces to

444kVa and line

current reduces to

640 amps

Pf angle

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Three phase

FORMULA TRIANGLE

POWER

VOLTS AMPS 1.732

x

Power = volts x 1.732 x amps Amps = power

volts line x 1.732

Line

Page 75: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Three phase calculations

• Calculating kW power for small three-phase supplies

• Power = line Voltage x line amps x PF x 1.732

(for small supplies assume PF as 1)

• (K)Watts = Line volts x Line amps x 1.732

• Line (phase) Amps = Power (K)Watts

line volts x 1.732

Page 76: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Calculating phase line current for three-phase project

• PV array is rated at 11.4 kWp (11,400 watts)

• What is the maximum line current output in amps if the line voltage is: (assume PF as 1)

• Line voltage is 415 volts

• Line voltage is 400 volts

• Formula is amps = power kW / line voltage x 1.732

Answer

• 15.86 amps line current

• 16.45 amps line current

Page 77: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Fault level current

This is the maximum fault current that a generator can deliver to a short circuit fault

• For inverter driven generation

The maximum fault current = output +5 %

• For rotating generators

This will require power engineering expertise with technical details of the rotating generator and calculations

Page 78: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Likely grid connection costs • Turn the voltage down at PMT = £2,500

• Isolation and safe working on O/H lines = £ 2000

• Turn the voltage down at S/S = £1,500

• HV DNO Grid network Study from = £2,000

• New PMT and transformer = (£10,000 to £32,000)

• New ground mounted HV S/S = £40,000

• New ground S/S with transformer = £65,000

• HV cable laying = £100 to £200 / m

• LV cable laying = £80 to £150 / m

• New O/H lines and poles = £80 - £120 / m

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Testing and commissioning & compliance

• Refer to Technical notes supplied

• G59 Testing & commissioning and compliance with DNO’s requirements

Outsource to a competent experienced engineer

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Break time

Page 81: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Exercise 2: Completing the ENA form for an example project

• Complete and submit to ENW using the ENW form for a 150 kWp PV solar project.

• The customers supply is 946 kW with a power factor of 0.95

• The estimated weekend base load is 145 kW

• Firm quotation is required

Page 82: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Generator customer grid assessment Required on the standard EA form

Questions A2 A3 A4

Power

Station

Power

Station

Customers

SITE

Customers

SITE

Customers

intake load

In KW

Customers

intake load

In kW

Grid supply

meter & fuses

Grid supply

meter & fuses

Import Power Kw

Import Power Kw

Customer

generator

Diagram no 1 (A2)

Diagram no 2 (A3)

The Grid supply

The Grid supply

Power

Station

Customers

SITE

Customers

intake load

In kW

Grid supply

meter & fuses

Import Power zero Kw

Customer

generator

Diagram no 3 (A4)

Export power in Kw

The Grid Supply

Page 83: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Group Exercise Repeat using the ENA form

• Complete and submit to ENW a ENA form for 150 kWp PV solar project.

• The customers supply is 946 kW with a power factor of 0.95

• Estimate the weekend base load

• Firm quotation is required

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INNOVATIVE THINKING FOR THE REAL WORLD 84

Page 85: Advanced grid connection workshop  16 07 13   presentation

INNOVATIVE THINKING FOR THE REAL WORLD

Advanced

Grid Connection Workshop

16th July 2013 SSummary and surgery

Geoff Owen, George Hall