Our installations feature a grid feed system that meets the latest grid connection requirements, and complying with latest statutory and Regulatory norms. Therefore it can be easily integrated to any state grid network.
This concept offers solutions such as reactive power management and voltage control for normal operation as well as for critical situations, resulting from network short-circuits or bottlenecks. Wind turbine behaviour is essentially comparable to conventional power plants. We are the first manufacturer worldwide to have received a certificate confirming these power plant properties.
Energy generated in our annular generator is fed to an inverter via a rectifier and a so-called DC link. This ensures that output power is regulated according to grid specifications. This is where stipulated requirements, such as voltage frequency and reactive power for each individual turbine in a wind farm, are implemented. The system transformer makes the conversion from 400 V to medium voltage. Which in turn step up to EHV level (66/132/220kv) at our own Pooling station before finally injected in to the State Grid.
The equipments used in our lines and substations are latest and coupled with all protective devices to trouble free operations
ELECTRICAL GRID COMPATIBILITY
The wind turbines offer maximum grid compatibility due to their control and operating mode. Output peaks do not occur due to the closed-loop and open-loop control concepts. Almost no reactive power is required in normal operation.
WIDE VOLTAGE AND FREQUENCY RANGES
Our grid feed system allows the wind turbine to operate within a wide range, promoting reliable operation in weak grids. This enables our wind energy converters to support the electrical grid, even at complex locations
STAY CONNECTED WHEN GRID PROBLEMS OCCUR
Similar to power station behaviour, wind turbines in transmission grids should not immediately disconnect from the grid when short circuits occur. During voltage dips due to grid problems, they should be able to remain connected to the grid. Our wind turbines have this capability.
If necessary, the turbines also support grid voltage when problems arise. This is achieved by feeding reactive power. After the problem has been remedied and grid voltage has been restored, the wind turbine immediately continues feeding power.
MAIN CONTROL UNIT (MCU) - FOR WIND POWER PLANTS
Individual wind farms functioning similar to conventional power plants have successfully been in operation and integrated in existing grid structures for many years. It is more and more common to find several wind farms connected to a central point of common coupling to form wind power plants.
Since installed power output is high, these plants usually feed power into high-performance transmission grids. Our main control unit (MCU) assumes centralized open-loop and closed-loop control of a wind power plant. It takes over typical communication and data transfer tasks to grid control systems and load dispatching centers fulfilling complex technical grid connection regulations for wind power plants.
Our MCU is available a as module. Each application is customized with features best suited to the project.
Depending on requirements our MCU has different interfaces to connect to the grid control systems. Bottleneck management for wind power plants is yet another feature part in addition to reactive power management, or the integration of switchgear assemblies or entire substations into the wind power plant.
Typical requirements for wind power plants in transmission grids:
- Wind turbines should be able to remain connected to the grid without power reduction, even if considerable voltage and frequency deviations occur.
- If voltage dips occur due to grid problems, wind turbines should remain connected to the grid for a defined period.
- Short circuit current feeding may be demanded during a grid failure.
- After a fault has been remedied, a wind farm should resume power feed as quickly as possible within a specified maximum time range.
- Wind farms should be able to operate with reduced power output without any time restrictions.
- For coordinated load distribution in the grid, the increase in power output (power gradient), for example when the wind farm is started up, should be able to be restricted in accordance with the grid operator's specifications.
- Wind farms should be able to contribute reserve energy within the grid. If grid frequency increases, the power output of a wind farm should be reduced.
- If necessary, wind farms should be able to contribute to maintaining voltage stability in the grid by supplying or accepting reactive power.
- Wind farms should be able to be integrated in the grid control system for remote monitoring and control of all wind turbines in the grid.