Elia Group Sa/nv · EURONEXT:ELI
Elia Group Sa/nv — Febeliec — Technical Presentation (February 2017)
9 slides from Elia Group Sa/nv's technical presentation, Feb 21, 2017
Slide 1: Asynchronous generator & Local voltage control
Febeliec input Asynchronous generator & Local voltage control 21/02/2017
Slide 2: Definition (RfG Art. 2)
Definition (RfG Art. 2) • Interpretation of NC – Asynchronous (induction) generator • Not a synchronous power-generating module • But a power park module • Through NC, implicit assumption of controllability of PPM is assumed 2
Slide 3: RfG Art. 20
RfG Art. 20 • Art. 20.2. Type B power park modules shall fulfil the following additional requirements in relation to voltage stability: – (a) with regard to reactive power capability, the relevant system operator shall have the right to specify the capability of a power park module to provide reacti
Slide 4: Example: a low power unit (500 kW)
Example: a low power unit (500 kW) • Connected to a distribution system – Effect of reactive power on the voltage is mainly local, on the DS – DSO is relevant system operator and determines capability • Connected to a CDS – CDSO is relevant system operator and determines capability – Requirements ca
Slide 5: Asynchronous generator in industry
Asynchronous generator in industry • Industry concern – Recover energy streams in processes at acceptable cost – RfG Art. 6 • Provides exception for active power modulation • Asynchronous generator is reliable and cost efficient method to recover energy streams – More expensive solutions are usually
Slide 6: Reactive power of asynchronous generator
Reactive power of asynchronous generator • Power Factor (PF) non-linear over operating range, therefore only fixed compensation for one operating point Boldea, Nasar, “The Induction Machine Handbook”, CRC Press, 2002 6
Slide 7: Reactive power of asynchronous generator
Reactive power of asynchronous generator • Assume requirement PF 0,9 – 242 kVAr in both directions • Expensive solution: – Bulk compensation + controlled compensation G – Investment strongly dependent on support mechanisms 7
Slide 8: Reactive power management in industry (example)
Reactive power management in industry (example) 150kV • Central compensation, LV and MV • Tap changers 36kV • First goal: local voltage control • High load and generator 240 kVAr inductive => local undervoltage • Exchange of reactive* power can be 6kV partially controlled G at Mconnection OFF point
Slide 9: Proposal Febeliec
Proposal Febeliec • Allow asynchronous generators for recovery of energy streams – Preference limit A/B = 1 MW and up to 1 MW induction generators are allowed • DSO, CDSO and demand facility owner define the reactive power capability requirements of small generators based on the boundary conditions