der involvement in distribution network voltage control

7/27/2019 Der Involvement in Distribution Network Voltage Control

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Flexible Electricity Network to Integrate the eXpected energy evolution 1

DER involvement indistribution network voltage

control

Outil de gestion des DER leurpermettant de participer au

rglage de la tension

Sbastien Grenard

EDF R&D


2/10


Increased deployment of DER expected

Technical issues

DSOs anticipate that they can integrate only a limited

capacity of DER without a major reinforcement.Limiting factors in many European distribution networks: voltage rise

effect

DSOs anticipate that they can integrate only a limited

capacity of DER without a major reinforcement.Limiting factors in many European distribution networks: voltage rise

effect


3/10


The voltage control issue with DER

PGMV

Voltage

Feederlength

Vmax

Vmin

Cos=1


4/10Flexible Electricity Network to Integrate the eXpected energy evolution 4

What are the solutions?

Approach with existing practise (fit and forget)

No control over DER / Worst case scenarios used for connection sizing

Active distribution network: Local and coordinated control of voltage

and flows (VVC: Volt VAr Control function) to: Maintain voltage within limits and Optimise other parameters (Reactive power

transit between DSO and TSO / Distribution network losses / .)

Increase DER hosting capacity

VVC

A

P,-Q

CHPS

P Q

LV

P Q

MV

NOP

MV

LV

LV

PV



Architecture of control centre tools for an

active network

Distribution

State

Estimation

(DSE)

VVC

Substation local

measurements

Commercial

Aggregator 1

Commercial

Aggregator 2 Network Data,

Pseudo

measurements

Constraints

Contracts

(with TSO)

Capacitor

banks

DER set

points

Transformers

tap changer

HMI

SCADA

Two possibilities of use:

Preventive studies

Real-time decisions

D t A i iti



Data Acquisition

and

state estimation

P(t)

Q(t)

V(t)

P(t)

Q(t)

V(t)

P(t)

Q(t)V(t)

P(t)

Q(t)

V(t)

- Use of Fenix Boxesfor metering

- Retrieval of data

by commercialaggregator SCADA

- DER outputs sent to

DSO SCADA

- Distribution State

Estimation (DSE)

Remote metering CHP_2




DERs remote monitoring ofAggregator portfolio

DistributionState

Estimation

(DSE)2

M m

m=1m

min J(x)=

SCADA in

CVPP2

SCADA inCVPP1

SCADAof DSOSCADAof DSOSCADA of

DSO



Advanced

monitoring

Results of DSE can

be monitored

Preventive studies

can be performed

to make sure the

day ahead

(or hour ahead)

operating point iswithin limits

Advanced Monitoring

State Estimation

CalculatedNetwork operatorMonitored

criterias

Advanced Monitoring

State Estimation

CalculatedNetwork operatorMonitored

criterias

Sudden change



Warning 1

Cos < Lim

ALARM 2

Under voltage

ALARM 1

Under voltage

Sudden change

of network

operating point

Consequences:

1) Undervoltagesoccur in the network

2) Power factor below

agreed threshold withTSO

3) Alarms in the DSO

control center

Event: loss of DER

Optimisation study

made by VVC

Network

Operator

Validate

New set points for

-DER

-Transformer tap-Capacitor bank

S t i t



SCADA of DSO

Set point of DERs

Set pointorder for

Capacitor Bank

Transformer Tap

Set points

modification

by the VVC

VVC provides new

set points to:

Network elements

-tap changer-capacitor banks

Commercial

Aggregatorsnew set points for DER

active/reactive power

Commercial

Aggregator 1

Volt VAr control settings

-DER

-Transformer tap changer

-Capacitor bank

DER

CommercialAggregator 2 DER



Benefits and main challenges

Main benefit of active management of distributionnetwork: Find the right balance between network

reinforcement and active management to reduceconnexion cost and increase DER hosting capacity

However, the main challenges may not only betechnical but also contractual and regulatory

with consequences on connexion rules

der involvement in distribution network voltage control

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