Slide 1: Task Force MOG 2
Task Force MOG 2 14.10.2022
Slide 2: Agenda
Agenda 9:30 - 10:00 Connection requirement Feedback ad-hoc technical workshop 16/09 Overview feedback received from stakeholders 10:00 – 11:00 Dynamic & Harmonic Presentation of voltage control & MVar concept for MOG 2 11:00 – 12:00 Market & grid design - workshop BOP presentation on grid and market
Slide 3: Connection requirements
ria Connection requirements
Slide 4: Energy Island Design: potential layout
Energy Island Design: potential layout AC substations DC substations DC converter 4
Slide 5: Initial Feedback ad-hoc technical workshop
Initial Feedback ad-hoc technical workshop Davy Verwilghen, Tom Trappeniers
Slide 6: Process overview
Process overview • A technical workshop took place on 16/09 • The goal of the workshop was to introduce design choices made by Elia, and to discuss with potential investors about other design elements • Written feedback was received on 7/10/2022 from 4 parties • The following slides are covering som
Slide 7: Interarray voltage level: 66 kV vs 132 kV
Interarray voltage level: 66 kV vs 132 kV • Elia explained reasoning behind the reference voltage level of 66kV at previous task force meetings • WTG and cable technology not timely and widely available for PEZ timing (2027-2029) • Preliminary review of more recent feedback from User Group confirms
Slide 8: Interarray cable design and configuration
Interarray cable design and configuration • Interarray cable design: • Elia proposal: 4 strings of 90MW/string + 1 spare that are connected to the GIS 66kV • Feedback User Group: Please clarify the distribution of spare bays • Conclusion: 1 spare bay per 700 MW seems feasible (but to be confirmed) •
Slide 9: Other feedback on connection requirements
Other feedback on connection requirements • Circuit breaker at first WTG (+ VT) • Elia proposal: integrate a Circuit Breaker + Voltage Transformer at the first Wind turbine generator to reduce the operational interface • Feedback User Group: Circuit breaker at first Wind turbine generator is not a s
Slide 10: Some quick wins
Some quick wins • Initial Elia proposal: Optical fibers 24f / OWF • New proposal: 48f / OWF incl. split for redundancy • Initial Elia proposal: Power supply 1x 230Vac • New proposal: 2x 230Vac UPS 10
Slide 11: Dynamic & Harmonic
Dynamic & Harmonic Fortunato Villella
Slide 12: 4 main clarifications for technical requirement for 1st tendering of MOG 2 OWF
4 main clarifications will be potentially defined in the technical requirement for 1st tendering of MOG 2 OWF 1 Forced oscillations: this phenomena must not lead to critical consequences for BE/EU system [Introduction provided in TF MOG 2 24/06] 2 Process for data sharing & model validation: need fo
Slide 13: Agenda
Agenda Goals & Context Voltage Control in MOG 2 - Structure of existing offshore connection - Hierarchical Voltage Control Philosophy for the MOG 2 - Distributed Controllers based Voltage Control Scheme Proof of Concept voltage control in MOG 2 - Setup of simulation - Combination analyzed - Dynamic
Slide 14: Goal and Context
lia Goal and Context
Slide 15: Goal and context of 'Wind Farm Voltage Control and MVar' study
Goal and context of ‘Wind Farm Voltage Control and MVar’ study Goal of this study Assess major impacts on voltage control for MOG 2 compared to MOG 1 and define needed adaptation to requirements Assess the impact on existing technical requirements Present and discuss the assessment performed by Elia
Slide 16: Voltage Control in MOG 2
lia Voltage Control in MOG 2
Slide 17: Structure of existing offshore connection in MOG I
Structure of existing offshore connection in MOG I POI: Point of Interface Structure MOG I 3 WT:3 Wind Winding Transformer OLTC: On Load Tap Change Transformer Elia The Point of Interface (POI) is at 225kV POI 225 kV and is connected to the client via an export cable or directly via a 3WT A 3WT conn
Slide 18: Voltage requirements for offshore parks
Voltage requirements for offshore parks (recent parks on MOG 1 and STEVIN) Capability curve Voltage droop control Upcc (p.u.) 1 p.u. (Pnom) Q3 Q4 1pu Reactive droop Requirements can be met at the POC (220kV/150kV) without extra considerable investments by the client Qmin 0 Qmax Underexcited Overexci
Slide 19: Structure of an existing offshore park and main design limitation
Structure of an existing offshore park and main design limitation Wind turbines cannot be fully used to compensate reactive Current parks can comply with ELIA requirements thanks to a precise control of the MV=33kV power for voltages far from nominal (via their platform TFO tap changer) Should the M
Slide 20: Fundamental difference for voltage control between MOG 1 and MOG 2
Fundamental difference for voltage control between MOG 1 and MOG 2 Voltage control MOG I Voltage control MOG 2 Aux 1 Power Park 1 ELIA Aux 1 SHR 1 ELIA 10 MV Ar G G Main differences xX xX Reserve Reserve xX 66 kV / 220kV 400 MVA? 33 kV / 220kV x X xX X x Change in client connection point SHR 2 10 MV
Slide 21: MOG 2 Voltage Control Scheme - Distributed Controller
MOG 2 Voltage Control Scheme - Distributed Controller Based on 220kV Voltage Measurements • 66kV should be kept at as constant as possible via automatic OLTC. Tradeoff between accuracy and speed to: • Keep voltage as much as possible to 1pu • Generate reasonable number of tap changes in line with li
Slide 22: Proof of Concept of voltage control in MOG 2 with vendor models
Proof of Concept of voltage control in MOG 2 with vendor models
Slide 23: RMS dynamic simulation setup used with model from vendors
RMS dynamic simulation setup used with model from vendors Simulation setup Wind pars are simulated in combinations of 2 parks from different vendors at a once for observations in static and dynamic situations. Full detailed existing 33kV internal network of the wind park (cables, strings, black boxe
Slide 24: Reactive power: Case 1/3 simulation results
Setup constructor 1 – constructor 2 Case 1/3 Simulation results SGRE 66kV Q-U diagram Elia Grid 66 kV side Vestas 66kV Tx Voltage [kV] HV SGRE 66kV Vestas 66kV Elia 220 kV Elia Grid Elia Grid 220kV Grid 220kV 66 kV 66 kV Park – A SGRE 66kV 200 MVAr shunt reactor switched at TxHV 66 kV side Vestas 66
Slide 25: Reactive power: Case 2/3 simulation results
Setup constructor 1 – constructor 3 Case 2/3 Simulation results SGRE 66kV Q-U diagram Elia Grid 66 kV side GE 66kV Tx Voltage [kV] HV SGRE 66kV GE 66kV 220 kV Elia Grid Elia Grid 220kV 66 kV 66 kV Park – B SGRE 66kV 200 MVAr shunt reactor switched at TxHV 66 kV side GE 66kV Reactive power [Mvar] • S
Slide 26: Reactive power: Case 3/3 simulation results and conclusions
Setup constructor 2 – constructor 3 and conclusions of all variants Case 3/3 Simulation results GE 66kV Q-U diagram Elia Grid 66 kV side Vestas 66kV Tx Voltage [kV] HV GE 66kV Vestas 66kV 220 kV Elia Grid Elia Grid 220kV 66 kV 66 kV Park – A GE 66kV 200 MVAr shunt reactor switched at TxHV 66 kV side
Slide 27: Lessons learned MOG2 Voltage control proof of concept
Lessons learned MOG2 Voltage control proof of concept Time response and droop value for the future wind park should be in the same range as currently defined in the existing requirement 66kV busbar should be operated at a voltage close to the nominal value with an OLTC allows maximum availability of
Slide 28: Proposal of adaptations for technical requirements based on Voltage Control study
Proposal of adaptations for technical requirements based on Voltage Control study 1. Reduce the range of voltage for which the wind park shall be able to deliver/absorb reactive power: • From +/-10% of the nominal value to +/-5% of the nominal value (this is valid for 66kV connection) • No impact on
Slide 29: Proposal of adaptations: reactive power set-point and fast reactive current injection
Proposal of adaptations for technical requirements based on ReX or existing available capability 4. Clarify the behavior of the wind park when a new set-point of reactive power is sent by ELIA • Current technical requirement doesn’t include the required details • Already implemented for MOG 1 (agree
Slide 30: Thank you.
Thank you.