Adjustable-speed pumped-storage motor-generators (AC excitation)
Adjustable-speed motor-generators are a technology that the founding companies were the first in the world to bring to industrial application (demonstration tests in 1987, the first 100 MW class system in 1993).
- Type
- doubly-fed asynchronized machine: cylindrical rotor with three-phase winding, AC excitation
- Power (supplied)
- 105–395 MVA
- Okawachi
- 395,000 kVA, 330–390 rpm
- Omarugawa
- 319–345 MVA, 576–624 rpm
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Adjustable-speed motor-generators are a technology that the founding companies were the first in the world to bring to industrial application (demonstration tests in 1987, the first 100 MW class system in 1993). By changing the rotational speed of the pumped-storage unit, the system allows power to be regulated in pump mode, increases efficiency and widens the operating range of the pump-turbine. Design. Unlike a fixed-speed machine with a salient-pole rotor, an adjustable-speed motor-generator has a cylindrical (non-salient-pole) rotor with a three-phase winding, banding and fixing of the end windings. The rotor is fed with variable-frequency AC from an excitation converter via slip rings, so the unit speed can differ from synchronous speed. The stator has a three-phase winding, as in a conventional machine. Grid capabilities: automatic frequency control in pump mode, participation in load-frequency control (LFC), and independent fast control of active and reactive power. During voltage dips caused by a short circuit, the AC-excited machine increases the rotor current almost in steps and compensates reactive power faster than a DC-excited synchronous machine. Supplies: Takami pumped-storage plant — 105,000 kVA (231 rpm ± 10%), after the 2019 refurbishment 128,500 kVA at 231 ± 23 rpm; Okawachi — 395,000 kVA at 330–390 rpm; Omarugawa — 345,000 and 319,000 kVA at 576–624 rpm; Avče (Slovenia) — 195,000 kVA at 600 rpm with a range of −4…+4.3%; Okutataragi — 350 MVA, 300 ± 15 rpm after conversion from fixed speed. Applications: new pumped-storage plants and conversion of existing units to adjustable speed for the integration of solar and wind generation. Geography of generator supply by the manufacturer and the founding companies: Japan — more than 33,000 MVA; North America — more than 8,000 MVA; Latin America — more than 13,000 MVA; Europe, the Middle East and Africa — more than 3,000 MVA; Asia and Oceania — more than 19,000 MVA.
Technical specifications
| Type | doubly-fed asynchronized machine: cylindrical rotor with three-phase winding, AC excitation |
|---|---|
| Power (supplied) | 105–395 MVA |
| Okawachi | 395,000 kVA, 330–390 rpm |
| Omarugawa | 319–345 MVA, 576–624 rpm |
| Avče (Slovenia) | 195,000 kVA, 600 rpm, −4…+4.3% |
| Takami | 128,500 kVA, 231 ± 23 rpm |
| Experience | since 1987 (first demonstration in the world) |
Request a price and lead time
Adjustable-speed pumped-storage motor-generators (AC excitation). We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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