T&C Voltage Service Provider (VSP) WG Belgian Grid 04/02/2020 - - PowerPoint PPT Presentation

T&C Voltage Service Provider (VSP)

Raphaël Dufour

WG Belgian Grid 04/02/2020

Agenda

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• 1. Context and timelines related to the voltage and reactive power service

2. Description of the main modifications brought in the T&C VSP (Voltage Service Providers):

• Participation to the service
• Role of VSP
• Prequalification
• Remuneration of the service
• Delivery control of the service
• Link with the tariff for the offtake or injection of additional reactive energy

Voltage and reactive Power Ancillary Service - Context and timelines

3

• The Go-live is

planned in January 2021

2018 2019 2020 2021

• New “target” design

was proposed for the voltage and reactive power control ancillary service

• Design note finalized

in November 2018 after public consultation

• Publication of new

FGC in April 2019

• T&C VSP available

by May 2020

Based on target design and in line with current legal framework Changes requested in the grid codes and Electricity Law E-law and RGC have not yet been changed

Voltage and reactive Power Ancillary Service – Status of the New design

4

• Main changes introduced in the new design are (// design note 2018):
• 1. In the Federal Grid Code and Regional Grid Codes:
• Service provision
• Contract
• VSP role
• 2. In the Electricity Law:
• Price
• Contracting process
• 3. Additionally
• Link with the MVAr tariff
• Remuneration

✓ (FGC) ✖ (RGC) ✓ ✖ ✓ Gen Req

Voltage and reactive Power Ancillary Service – Focus on 2020

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2020 2021

Today Jan Mar May Jul Sep Nov 2021

Jan 27

Public consultation of the T&C VSP

Feb 24 Jun 1

Call for tender

Jun 30 Jan 1

Entry into force T&C VSP

May 1

Call for candidates

May 31

Main steps related to the service:

• The public consultation of the T&C VSP (Voltage Service Provider) runs from 27th January to 24th February 2020
• A tender will be launched for 2021 but with mandatory bidding at free prices and the possibility of royal decree

Modifications to the T&C VSP

Voltage and reactive Power Ancillary Service – Participation

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Grid user Federal level Participation FGC articles New Type B,C,D SPGM Obliged

• Art. 89 +234

New Type B,C,D PPM Obliged

• Art. 93 & 99 +234

New Type B, C, D SPM Obliged

• Art. 93 & 99 +234

New HVDC interconnector Obliged

• Art. 104 +234

New generators connected on a HVDC link Obliged

• Art. 106 + 234

New HVDC conversion stations at isolated extremity Obliged

• Art. 107 +234

New offshore generators with onshore connection points Obliged

• Art. 117 & 118 +234

New offshore generators with offshore connection points Obliged

• Art. 130 & 131 +234

Existing generator type C,D Obliged

• Art. 62 to 68 +234

Existing generator type B Obliged

• Art. 62 to 68 (To be agreed

with system operator) +234

Direct clients demand facilities Voluntary

• Art. 234

Regional level Participation General requirements rfG Obliged

• Art. 4.3.1/5.5.1/-

Obliged

• Art. 4.4.2/5.6.2/-

Voluntary No RGC yet n.a. Voluntary No RGC yet Voluntary Voluntary DSO Voluntary

• Art. 234

CDSO Voluntary

• Art. 234

Elia grid Non- Elia grid

Voltage and reactive Power Ancillary Service – Voltage Service Provider

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• The VSP should be the de facto provider of the MVAR service towards Elia
• According to Art. 234 of the FGC, the VSP is
• The grid user
• Any third party designated buy the Grid User following a designation procedure whose template is

foreseen in the VSP contract

• VSP of a technical unit connected to a public distribution system or a CDS (voluntary participation)
• Art. 234 of the FGC states that the service can only be delivered with prior approval of DSO/CDSO and

exact modalities are described in the VSP contract

• According to previous stakeholders feedback, VSP contract states that the DSO/CDSO has to be the

VSP for those technical units

Technically: help Elia regulate voltage by managing third party assets Contractually: Be the contractual counterpart for delivery of AS v-à-v Elia Operationally: operate assets to provide the service Financially: Receive remuneration & pay penalties

VSP role

Prequalification Procedure

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• The prequalification test is performed before the delivery of the service and aims at measuring and determining the main

characteristics and parameters of the service e.g.:

• The reactive power technical control band which is defined by the technical minimum and the technical maximum

reactive power that a technical unit can absorb or generate;

• The Service Measurement Point which is the point where the service is delivered by a technical unit (used for

remuneration and delivery control). The Service Measurement Point is by default:

• the access point (for technical units connected to the Elia Grid or to a CDS connected to the Elia grid) or
• the Interconnection Point (for technical units located in distribution grid);
• The sensitivity coefficient (alpha) in case the VSP provides the automatic voltage control service. This coefficient

defines the linear relation between the voltage and the reactive power produced or absorbed at the Service Measurement Point. Elia will determine this sensitivity coefficient in collaboration with the VSP.

Remark on the determination of the sensitivity coefficient: If a clear relation between the voltage and the reactive power cannot be determined at the level of the access point (for instance when the technical unit is a local production unit located in the internal grid of the Grid User “far from” the access point), Elia may request, during the prequalification phase after discussion with the VSP:  to move the Service Measurement Point to a point located downstream the access point and at the level of the technical unit (Q_req_unit and Q_meas_unit on the figure), and this upon agreement of the VSP;  to provide the manual service instead of the automatic service.

Qreq_AP Qmeas_AP Qmeas_unit Qload Qreq_unit

Remuneration of the Service

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• New remuneration principle based on the requested reactive power (Q_req_rem) instead of measured reactive power
• The computation of the requested reactive power is based on:
• For the manual service, the setpoint(s) sent by Elia in the context of a manual activation;
• For the automatic service, the automatically requested reactive power that represents the reactive power that the unit

should deliver at the Service Measurement Point based on the voltage variations on this point. Example of computation of Q_req_rem for a controlling technical unit

1 2 1 2

1. Q_req_auto: the automatically requested reactive power, which is a linear function of the grid voltage measured at the Service Measurement Point with a slope equals to the sensitivity coefficient. The droop curve is defined by this sensitivity coefficient and by the Vstartup. 2. Q_req_manual: the manually requested reactive power that equals to the setpoint changes requested by Elia

• GV(t): the grid voltage for the specific quarter-hour controlled;
• Vstartup: the average grid voltage value of the quarter-hour during which the unit started up for the last time (meaning the last moment in time where the technical unit’s active power injection value exceeded

its Pmin value as agreed in the annex 1 of the VSP contract

• ΔQreq: The last Setpoint change value communicated by Elia.

Remuneration of the Service - Example

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Example of computation of Q_req_rem for a controlling technical unit

• 1. Qh 0 : The Technical Unit starts injecting Active Power above its minimum Active

Power threshold (average grid voltage over Qh 0 is Vstartup).

• 2. Qh 1 : While still at setpoint 0 the grid voltage evolves to GV(Qh1) no setpoint

change request from Elia was received during this quarter-hour.

• 3. Qh 2: During Qh2 the unit has received a request for setpoint change and has

moved its droop curve to Setpoint 1. During the same quarter-hour, the grid voltage evolved to GV(Qh2) (ΔQreq=Setpoint 1-Setpoint 0)

• 4. Qh 3: During Qh3 the unit has received a request for setpoint change and has

moved its droop curve to Setpoint 2 (ΔQreq=Setpoint 2-Setpoint 0)

Delivery Control of Automatic Service

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• To be coherent with the new remuneration mechanism, Elia introduces also some modifications of the automatic delivery control

mechanism in order to increase its accuracy and efficiency.

Date Hour P Pmin GV = Umeas Qmeas Qreq_control Limit inf. [MVAr] Limit sup. [MVAr] Succeeded? [MW] [MW] [kV] [MVAr] [MVAr]

03/09/2019 13:45 150 100 158,4 14,36 3,37

• 3.88

10,62 N 03/09/2019 14:00 150 100 158,1 12,56 5,42

• 1,83

12,67 Y 03/09/2019 14:15 150 100 158,3 10,63 3,87

• 3,38

11,12 Y 03/09/2019 14:30 150 100 158,3 11,2 4,35

• 2,9

11,6 Y 03/09/2019 14:45 150 100 158,5 13,06 2,43

• 4,82

9,68 N 03/09/2019 15:00 150 100 158,3 14,99 3,76

• 3,49

11,01 N 03/09/2019 15:15 150 100 158,3 15,53 4,01

• 3,24

11,26 N 03/09/2019 15:30 150 100 158,5 14,26 2,76

• 4,49

10,01 N 03/09/2019 15:45 150 100 158,5 8,73 2,26

• 4,99

9,51 Y 03/09/2019 16:00 150 100 158,7 7,83 0,95

• 6,3

8,2 Y 03/09/2019 16:15 150 100 158,2 8,76 5,05

• 2,2

12,3 Y 03/09/2019 16:30 150 100 158,1 9,03 5,72

• 1,53

12,97 Y 03/09/2019 16:45 150 100 158,1 14,21 5,53

• 1,72

12,78 N 03/09/2019 17:00 150 100 158,3 15,26 4,48

• 2,77

11,73 N 03/09/2019 17:15 150 100 158,1 11,69 5,43

• 1,82

12,68 Y 03/09/2019 17:30 150 100 158 11,3 6,73

• 0,52

13,98 Y 03/09/2019 17:45 150 100 157,8 13,39 8,38 1,13 15,63 Y 03/09/2019 18:00 150 100 157,7 16 9,17 1,92 16,42 Y 03/09/2019 18:15 150 100 157,6 16,8 9,94 2,69 17,19 Y 03/09/2019 18:30 150 100 156,8 24,9 16,72 9,47 23,97 N

1. Obtaining measurements of the grid voltage and metering

• f the reactive power at the Service Measurement Point

(GV and Q_measured) 2. Computation of the requested volume Q_req_control (=Q_req_rem) 3. Computation of the tolerance margin and application of this margin around Q_req_control:  Limit inf. = 𝑅𝑠𝑓𝑟_𝑑𝑝𝑜𝑢𝑠𝑝𝑚 − 7.25 MVAr  Limit sup = 𝑅𝑠𝑓𝑟_𝑑𝑝𝑜𝑢𝑠𝑝𝑚 + 7.25 MVAr 4. Check for each quarter-hour if Q_measured is within the tolerance band defined above

1 2 3 4

Link between the Voltage and reactive Power Ancillary Service and the tariff for the offtake or injection of additional reactive energy

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Bilateral agreement between the VSP and the Access Contract Holder

• Specific case when a ACH and a VSP are behind the same access point (e.g. local production)
• A mutual agreement between ACH and VSP behind a same Access Point is necessary in case of incorrect activation
• This agreement considers the fact that the tariff for the offtake or injection of additional reactive energy is corrected with the

reactive power requested by the service

Correction of the requested MVAr Correction of the requested MVAr Case 1: correction of a correct activation Measured MVAr Corrected MVAr Case 2: correction of a missed activation  out of the zone P Q Q P

Correction of the tariff on basis of the activation of the voltage and reactive power service

• The requested reactive power (Q_req) defined in the contract will be corrected
• The tolerance margin defined in the VSP contract proposal will also be applied for this correction

Link between the Voltage and reactive Power Ancillary Service and the tariff for the offtake or injection of additional reactive energy

Penalties related to the delivery control of the service and tariff for the offtake or injection of additional reactive energy:

• The tariff will be applied to access points with offtake and injection of active power including access point providing the Voltage

and Reactive power control service

• A party could face to a double penalty if it is subject to tariff and delivery control penalty for the Voltage and Reactive power

control service

• To avoid this double penalty, the delivery control of both the automatic and manual services will take into account the possible

penalty already applied in the context of the tariff for the offtake or injection of additional reactive energy i.e.

• in case of a failed delivery control, any quarter-hours for which a reactive power volume has already been penalized

through the tariffs for the offtake or injection of additional reactive energy will not be considered in the delivery control.

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Back-up slides

Voltage and reactive Power Ancillary Service – Status of the New design

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• The new Federal Grid Code and general requirements are available
• Electricity Law (Art. 12 quinquies) and Regional Grid Code did not change

Subject – New grid codes AS IS TO BE Contracting process Tender Not specified Role / Voltage Service Provider Contract Non Regulated Regulated Service provision Voluntary Mandatory for some generation and storage assets (see next slide) Volume to be provided No obliged volume “Technical capacity” Voluntary participants All participants voluntary Open to demand facilities, DSO and CDS (see next slide) Subject - Others AS IS TO BE Remuneration Delivered MVAr Requested MVAr* Relation with MVAr tariff / Access point holder pays tariff + correction in case of activation of the service  Mutual agreement between ACH and VSP behind a same Access Point* Penalty Proportional to non delivered MVArs Administrative penalties if the service is not correctly delivered Subject – E-law AS IS TO BE Contracting process Tender Tender or standard contract Prices Free prices with possibility

• f Royal Decree

Regulated price(s)

✓ ✓ ✖ A tender will be launched for 2021 but with mandatory bidding at free prices and the possibility of royal decree