More Information
Pre-assembled inverter station for large-scale PV power plants
- Fully integrated central inverter station including medium voltage transformer,
ventilation and monitoring system - Available in the power classes 700 kW to 1.2 MW; graduated in 100 kW steps
- Minimum planning, transport and installation costs
- Optimised ventilation concept for reliable operation
Ready-for-connection comprehensive system
The new central inverter stations are pre-assembled complete solutions, available in the power classes 700 kW to 1,2 MW. They have been developed especially for the quick and error-free planning and installation of large-scale PV power plants and contain Voltwerk VC central inverters and a highly efficient medium-voltage transformer. An optional medium voltage switch gear can be integrated ex works. All connection and ventilation devices as well as the monitoring system are pre-installed and tested ex works. This allows an on-site plug & play installation.
Future-proof
The Voltwerk VIS series guarantees the operators of PV plants a maximum return throughout the entire service life. The central inverters of the Voltwerk VC series comply with all European legal norms and standards, such as the German “Medium Voltage Directive”. The entire stations is design approved and complies in dimension and lay-out with the European standard requirements.
Long maintenance intervals
Voltwerk central inverter stations reduce planning, transport and installation costs significantly. Besides the medium voltage connection, only the PV generator, a remote transmission line for the data telecommunication and any given optional components have to be connected. Moreover, the integrated ventilation system has generous airflow and filter volume reserves, which allow very long maintenance intervals.
Flexible
For project specific adjustments the stations can be fitted with various optional accessories at works. E.g. dry-type transformers are available as well as medium range switch gear.
| Input values (Solar generator) | |
|---|---|
| Maximum DC input voltage (Vdcmax) | 1,000 V |
| Minimum DC input voltage (Vdcmin) | 530 V |
| Maximum MPP voltage (Vmppmax) | 800 V |
| Minimum MPP voltage (Vmppmin) | 530 V |
| Maximum input current (Ipcmax) | 590 A (VC 300) / 400 A (VC 200) per inverter |
| Number of inputs | 4 per inverter |
| Fuse per input | 175 A - 250 A (adjustable) |
| Connection design | M 12 bolts on copper bar |
| Generator junction box | Integrated in inverter |
| Output data (grid) | |
| Rated grid voltage (Vac,r) | 20 kV with tappings 2x +/-2,5% |
| Rated frequency (fr) | 50 Hz |
| Maximum frequency (fmax) | 65 Hz |
| Minimum frequency (fmin) | 45 Hz |
| Cosphi at rated capacity (cos φ) | Adjustable 0.7 inductive to 0.7 capacitive |
| Distortion factor (at rated capacity) | ≤ 2 % |
| Connection design 7 | Connection type A acc. EN 50180 and EN 50181, external cone 250A |
| Auxiliary supply | |
| Required supply | 400 V / 50 / 14kVA / 3-phases with N / TN grid |
| Required pre-fuses | C20 A 3 phases |
| Supply for customer devices | B16 A / 230 V / with RCD (one connection per inverter) |
| Optional auxiliary transformer | Dry-type transformator 400 V / 14kVA |
| Cooling | |
| Cooling type | Air cooling, individually thermally controlled fan |
| Type of air filter | Pocket filter in accordance with G3 EN 779 |
| Filter surface | 40 m² |
| Maximum counterpressure with additional station conversion | 50 Pa in total for feed and exhaust air |
| Environmental / ambient conditions | |
| Temperature range 1 | –20 °C / +50 °C |
| Maximum temperature for permanent rated capacity 1 | +50 °C |
| Relative humidity (non-condensing) | ≤ 95 % |
| Installation altitude above sea level | ≤ 2,000 m |
| Safety / protective equipment | |
| Protection type | IP 54 in accordance with EN 60529 |
| Ground fault monitoring | Yes, with adjustable reaction type |
| Surge arrester | Integrated in inverter: DC-side type II. grid-side type I in accordance with IEC 61643-1 |
| Isolation of solar generator from the grid | Galvanic isolation by means of the medium-voltage transformer |
| Medium-voltage transformer 7 | |
| Construction | Oil transformer. hermetic design |
| Cooling | ONAN |
| Charging | Dry and vented mineral oil |
| Tappings | 21.0 kV / 20.5 kV / 20 kV / 19.5 kV / 19 kV |
| Inverter | |
| Transient emissions (EMC) | DIN EN 61000-6-4:2007-09 |
| Interference resistance (EMC) | DIN EN 61000-6-2:2006-03 |
| Equipment reliability | DIN EN 50178:1998-04 |
| Pre-configured standards for grid monitoring | VDE 0126-1-1, ENEL, RD664, RD1663, EN50438:2007, ÖVE E 2750 |
| Station design | |
| Material | wu lightweight concrete LC 25 / 28 in acc. with DIN 1045:2001-07 |
| Exposition class for exterior parts | XC4, XF1, XA1 in accordance with DIN 1045:2001-07 |
| Exposition class for interior parts | XC1 in accordance with DIN 1045:2001-07 |
| Exterior walls | Washed-out concrete, granularity 8/16 (other options available) |
| Roof | Concrete, floating design |
| Foundation trough | Oil-proof in acc. with § 19 German Water Mgmt. (metal oil pan optional) |
| Exhaust air hood | Aluminium |
| Air grilles / doors / frames | Hot-dip galvanised steel (optional aluminium) |
| Attachment points | 4 x Deha anchors, type 20 T |
| Number of cable inputs | Number, position and design depend on the project requirements |
| Earthing bushing | Hauff earthing bushing HEA-I-M12 |
| Standards | |
| Grid quality | DIN EN 61000-3-11:2001-04 / DIN EN 61000-3-12:2005-09 |
| CE conformity | Yes |
| Design approval | Yes (Bureau Veritas) |
| Conformity with German Renewable Energies Act § 6.1 EEG 2009 §6.1 | Yes (additional hardware may be necessary) |
| Conformaty with Medium Voltage Directive (BDEW) of June 2008 | Yes (additional hardware may be necessary) |
| Type | VIS 700 | VIS 800 | VIS 900 | VIS 1000 | VIS 1100 | VIS 1200 | |||
|---|---|---|---|---|---|---|---|---|---|
| Article number | V1-120-07 | V1-120-018 | V1-120-019 | V1-120-020 | V1-120-021 | V1-120-022 | |||
| AC Rated power (Pac, r) (inverter) | 700 kVA | 800 kVA | 900 kVA | 1000 kVA | 1100 kVA | 1200 kVA | |||
| Recommended DC output (kWp) | 770 | 880 | 990 | 1100 | 1210 | 1320 | |||
| Maximum DC Power (kWp) | 840 | 960 | 1080 | 1200 | 1320 | 1440 | |||
| AC rated current (A) | 20.20 | 23.10 | 25.98 | 28.87 | 31.75 | 34.64 | |||
| System efficiency factor 7 | |||||||||
| Maximum efficiency factor | 98.1 % | 98.1 % | 98.1 % | 98.1 % | 98.1 % | 98.1 % | |||
| European efficiency factor | 97.6 % | 97.7 % | 97.8 % | 97.7 % | 97.7 % | 97.8 % | |||
| Californian efficiency factor | 97.9 % | 98.0 % | 98.0 % | 98.0 % | 98.0 % | 98.0 % | |||
| Auxiliary supply 2 | |||||||||
| Stand-by / nighttime performance (Pnight) | 330 W | 330 W | 330 W | 440 W | 440 W | 440 W | |||
| Power consumption (Pday) 7 | |||||||||
| Medium voltage transformer | |||||||||
| Rated power | 900 kVA | 900 kVA | 900 kVA | 1200 kVA | 1200 kVA | 1200 kVA | |||
| Vector group | Dyn5 | Dyn5 | Dyn5 | Dyn5 | Dyn5 | Dyn5 | |||
| Short circuit voltage 6 | 6 % | 6 % | 6 % | 6 % | 6 % | 6 % | |||
| No-load losses 7 | 400 W | 400 W | 400 W | 580 W | 580 W | 580 W | |||
Dimensions / Weight | |||||||||
| Dimensions (W x H x D) 5 | 2.980 x 2.980 x 6.980 mm | ||||||||
| Weight of entire station in tons 7 | 35 t | 35 t | 35 t | 35 t | 35 t | 35 t | |||
1 Depending on the operating status a derating resulting from the transformer monitoring may be possible.
2 Values at external auxiliary supply; values may vary with development condition and filter pollution grade.
3 Fans inside the station work speed-controlled.
4 Values when an external auxiliary supply is used.
5 Height specification without exhaust air hoods. Height for transport 3,25 m.
6 Typical values.
7 Exemption values when using optional accessories e.g. dry-type transformer.