HVDC-Diamond — HVDC converter station based on VSC/MMC, 50–1000+ MW
HVDC-Diamond is a high-voltage direct current (HVDC) transmission system based on voltage source converters (VSC) with MMC topology. The station rating scales from 50 to 1000 MW and more. The system is used for interconnections between power systems, grid reinforcement, long-distance transmission from renewables and power evacuation from offshore wind farms.
- Technology
- voltage source converter (VSC), modular multilevel (MMC)
- Rating
- from 50 MW to 1000 MW and more
- Power switches
- own X-Series IGBTs, parallel connection in submodules
- Functions
- reactive power control, black start, power reversal, FRT, oscillation damping
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The company has been developing high-power power electronics systems for more than 40 years, and HVDC-Diamond is its newest offering in the field of HVDC. The converter is built on the proven topology of a modular multilevel converter. Each phase has an upper and a lower arm with a large number of series-connected submodules, and their number is determined by the voltage on the DC side.
The submodules are switched according to a PWM algorithm, and the converter composes the output voltage from many small steps. On the AC side an almost sinusoidal waveform is obtained, and on the DC side a smoothed voltage. Therefore harmonic filters are, as a rule, not needed, and the station turns out compact. The converter forms the voltage without a reference grid, so it can supply a passive load and perform a black start of a power system. Weak networks with low short-circuit power are also easier to connect, because the converter does not need a strong grid for commutation. Reactive power control at each end of the line is provided as an additional function of the station.
In the submodules, X-Series IGBTs of the company's own production are connected in parallel. These devices have been proven in traction and industrial applications, and for the power industry they are optimized for losses. The IGBT modules, capacitors and mechanical bypass switches are developed and manufactured by the company or its subsidiaries, so the supplier controls the entire power part. The experience of power electronics for grids is transferred here from STATCOM compensators built on the same topology.
The control and protection system is fully integrated and runs on a high-speed redundant platform. Functions are configured to customer requirements, including fault ride-through (FRT), power oscillation damping and black start control. Compared with thyristor-based HVDC (LCC), the VSC scheme gives faster response, independent control of active and reactive power and fast power reversal with unchanged voltage polarity. On its basis it is easier to build multi-terminal DC networks.
Typical applications include interconnections between power systems, including back-to-back DC links, grid reinforcement in areas of growing load, long-distance transmission from renewables and power evacuation from offshore wind farms. Complete systems together with auxiliary equipment are tested at the 50 MW HVDC-Diamond test facility in Amagasaki (Japan). The facility makes it possible to work out the integration of the converter, control and auxiliary systems before shipment to the site.
Technical specifications
| Technology | voltage source converter (VSC), modular multilevel (MMC) |
|---|---|
| Rating | from 50 MW to 1000 MW and more |
| Power switches | own X-Series IGBTs, parallel connection in submodules |
| Functions | reactive power control, black start, power reversal, FRT, oscillation damping |
| Application | interconnections between power systems (including back-to-back DC links), grid reinforcement, long-distance transmission, offshore wind farms |
| Test facility | 50 MW, Amagasaki (Japan) |
Request a price and lead time
HVDC-Diamond — HVDC converter station based on VSC/MMC, 50–1000+ MW. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8504 40 90 00 |
|---|---|
| HS, 6 digits | 8504 40 |
| CN (EU) | 8504 40 90 |
| HTSUS (USA) | 8504 40 95 80 |
| China customs tariff | 8504 40 99 99 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What ratings are available for HVDC-Diamond stations?
From 50 to 1000 MW and more. The converter is built on the modular MMC topology.
Can the system perform a black start of a power system?
Yes, the VSC converter forms the voltage without a reference grid, so it supplies a passive load and supports the black start function.
Where are complete HVDC-Diamond systems tested?
At the 50 MW test facility in Amagasaki (Japan), together with the auxiliary equipment.
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