Access and Connection processes for Renewable Units: Experiences from Red Eléctrica de España Istambul March 2011.

Access and Connection processes for Renewable Units:

Experiences from Red Eléctrica de España

Istambul March 2011

RED ELÉCTRICA DE ESPAÑA

Recently, National regulation oriented to control of generation to be connected per year,

securing economic and technical sustainability

RD1578/2008 for Solar FV, extending RD661 objectives with quotas of 500-400 MW per year with progressive reduction of tariffs

emphasis on roof plants over floor plants

RDL6/2009 for the rest of SRG, establishing quotas per year for plants to be commissioned (upto ≈ 2,5 GW Solar Thermal in 2013; upto ≈ 23 GW Wind in 2012), demonstrating some pre-requisites:

Access and connection authorization issued by REE or distribution company

Administrative authorization for power plants > 100 kW

License for Commissioning

Deposit of a bank guarantee (for wind: 20€/kW; for Solar Thermal: 100€/kW)

Financial resources at least for 50% of the total

Purchase -or contract- at least for 50% of the equipment

Authorisation for gas access and water supply (when applicable)

Recent modifications of regulation for Special Regime Generation (SRG)


3

Capacity of the Transmission Network for Generators:

General: No grid capacity reserve or preference derives from temporal precedence. Possible production constraints are to be solved by market mechanisms

No connection limitation: Newcomers may degrade the production possibilities of existing or previously foreseen

Less barriers but more uncertainty tendency to overinstallation

Special Regime Generation

Priority at dispatch, subject to system security operation risk

Congestions motivate system development ineffective planning

Connection limitation according to zonal studies from OS

Development and Access to the Network


Number of Access applications very over some

transmission nodes evacuation capacity

Regional limits for installing new generation

Wind farms building time much shorter than needed for

network developments necessary for connection

Permissions for new generation (via Regional

Administration) easier to get than network reinforcement

ones

Network Access and Connection: Transmission grid development implications from RES units


5

Interaction between Grid Planning and Access to the grid applications

Access to the grid Regulated continuous process

by which REE assess the

acceptability of non-

transmission facilities

applications

Grid Planning• REE carries out planning studies and proposals

• National Goverment (with Regional Administrations):

approve the grid development plan

• Every 4 years, new planning horizon (10 years)

Binding (unlike indicative planning for generation)

The actual development of the grid (authorization, construction and commissioning) takes from 1 to more than 10 years

Studies for SRG Integration


6

A new perspective is introduced

From ¿What capacity of integration ?

To ¿Which conditions and requisites

would be needed to maximize secure integration of SRG (RES) and achieve the foreseen objectives?

SRG Integration Studies

Regulation Proposals

Grid Studies Zonal connection capacity in MW

Bulk System or Coverage Studies(Single Bus System Adequacy Studies)

Estimation of Operation Conditions


7

Capacity Studies

Assessment of generation limits to preserve adequacy and security of power

system, according to planning and operation criteria, applied to an horizon within the

current medium term grid development plan

Adequacy: Assessment of generation limits by nodes and zones,

reflecting structural grid capacity

Steady State Behaviour (load flow contingency analysis)

Short-circuit power (5% Scc, for non dispatchable fluctuant

generation)

Security: Validation of previously concluded limits by nodes and zones

Dynamic behaviour (stability after short-circuit)

Design criteria: buses with sufficient meshing, minimum magnitud for

generation, …..


8

Preserving the security of supply requires to avoid persistent constraints from RES units in order to:

Limit the operational risk associated to the solution of constraints and the security guarantee, specially considering the dispatch priority

Enable a coherent and efficient grid development

This calls for establishing connection capacities by zone associated to grid development plans which may avoid permanent constraints

Development and Access to the Network for Renewable Generators (RES): Connection Capacity


9

Access and Connection : Overview Procedures for Access and connection are managed by REE, as System

Operator and and Transmission owner. Main Features:

Main Perspective Object - Scope

Access System Operation System behaviour

Connection Transmission Engineering and Physical Feasibility

Connection Contract (CC)

REE carries out capacity studies at nodal and regional levels Capacity of Connection

Regional Administrations identify Coordinator (C) and generators

C accomplish Access and Connection Procedures Connection Authorisation

Connection Authorisation enables Administrative Authorisation

Administrative Authorisation enables Connection Contract with Transco

Administrative process (*) different according to Regions

Recently, new national regulation oriented to control of generation to be connected per year, securing economic and technical sustainability (National Administration)


10

Access and Connection : Overview

Procedures

Access Application (m = month)

Connection to Transmission >>> SO (REE)

Connection to Distribution (> 10 MW.) > DO> SO (REE)

REE issues a report evaluating access feasibility, fulfilling system security criteria

Connection Application >>> Trans.Co.

Agent submits engineering Project and Programme

Trans.Co. elaborates Report of Technical Conditions for Connection

SO (REE) supervises and issues a report

Agent < TECHNICAL ACCESS CONTRACT> Transmission Company

2m

1m1m


11

Access approach for special generation REE carries out Regional studies assessing capacity connection for

generation (depending on energy source and technology), which are sent and presented to Regional Adm.

Individual Applications: Access reply is informative not valid for connection procedure

Regional Adm. Identify (*) generators according and nominates Coordinator

Coordinator submits access application with the aggregation of individual plants sharing connection point and facilities

REE replies according to the Regional study, accomplishing access procedure and enabling to start and accomplish connection procedure: Connection Authorisation

Connection Authorisation enables Administrative Authorisation

Administrative Authorisation enables Access Technical Contract with Transco

Administrative process (*) different according to Region


12

Regulation for connection and Administrative Authorisation for Special Regime (renewable) units

Report by SO: Acess,

connection, integrat. at Control

Center and Operating

procedures fulfillment

Connection Contract

Definitive Inscription (after 85% of objective

final date)

Previous Inscr. In Register

Administrative Authorisation

Electrical Procedures

Regional administrative Authorization

Connection

CommissioningGUARANTEECANCELATION

Special Regime Register (Spanish Industry Ministry)

An additional bank Guarantee is required by National Administration

Access

Authorisation PESp

Application

Bank Guarantee to cover TSO access + connection

management expenses

Commissioning Certificate

Requirements

Production Control Checks

Access

Coordinated Application


13

NºNodesRdT Today Future

220 & 400 kV 49 > 100

Grid development

WIND POWER: High presence in

transmission (>60%, contrary to

other systems with high penetration)

and expected to increase

3.830 MW

4.293 MW2.960 MW

250 MW

Grid Applications: 14.730 MW

T: 11.583 MW

D: 3.147 MW

150 MW 250 MW

41 MW

435 MW

49 MW

22 MW

400 MW

100 MW

1.800 MW

150 MW

SOLAR POWER:

TS.- Majoritary in transmission (≈ 80%)

FV.- Minoritary in transmission(≈ 5% of

existing; few new plans)


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ELS AUBALS

SECUITASECUITA

RES generation does not avoid distribution grid but requires transmission expansion, where the majority of Wind Power (>60%) and Solar Thermal (>80%) is expected. RES is a relevant motivation in the current Plan:

new lines and reinforcements for avoiding constrains operation

facilities associated to physical connection

Main challenges: Grid Development

Particular significance: Spain-France interconnection

H2016Approved may08. Reviewed 2010

≈ 8,000 M€

OH Circuit [km] 12.270UG Cables [km] 386Uprating lines [km] 8.308SS [nº bays *] 3.476Transformers [MVA] 52.450Reactors [Mvar] 2.800Capacitors [Mvar] 1.100

New substations and bays: Some 100 buses in 220 kV

and 50 in 400 kV


Cost Allocation of New Facilities ¿transmission border and who pays what?

Investment CostOperation and

Maintenance Cost

Transmission Facilities

Directly associated to connection

Assumed by the agent System

Structural Reinforcement

System

(Agent guarantees 20% of Cost)System

Connection Facilities Agent

New bay

New substation

as in/out of

existing line

New

bay

Existing

Substation

TransGrid

Connection Facilities (no TransGrid)

Transmission grid development implications


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Access and Connection processes for Renewable Units: Experiences from Red Eléctrica de España Istambul March 2011.

Documents

grid authorization

planning studies

capacity of integration

grid capacity reserve

connection authorization

grid applicationsaccess

gas access

new planning horizon