Wind energy is a clean and renewable energy source. Wind power generation is the main form of wind energy utilization. It is also one of the most mature, most large-scale development conditions and commercial development prospects of renewable energy. The use of wind energy can adjust the energy structure, reduce greenhouse gas emissions, and alleviate environmental pollution. In areas with good wind energy resources, it can be used as a supplementary energy source to alleviate energy shortages and power shortages there. Due to the harsh environment of the wind turbine application environment and the special requirements for the long life, high reliability and safety of the unit 20, the manufacturing technology of important components of the wind turbine such as gearbox and generator has become a difficult point of the wind turbine. . In order to improve the testing capabilities of key components of wind turbines, master the key testing technologies of wind turbines, and improve the quality of wind turbines, most wind turbine manufacturers have built large-scale wind turbine test platforms. Through the data obtained on the test platform, optimize the performance of the wind turbine, and provide the necessary test environment and means for the development and replacement of new models or new components.
At present, in foreign countries, especially those with more developed wind power industry, they have similar high-power test platforms, and full-power or transmission chain drive tests of wind turbines are carried out on the test platform. During the test, according to the voltage level of the generator, it is necessary to increase the corresponding transformer so that the grid voltage can be boosted or stepped down to reach the rated voltage level of the generator stator. The existing test bench transformers in China are mostly used in a single way, and simply meet the test requirements of a wind turbine generator. The transformer provided by this scheme can be compatible with the completion of the 6MW doubly-fed wind turbine drive train transmission test and the full power test of the 3MW hydraulic coupling type wind turbine, which can better save manufacturing and infrastructure costs and ensure the realization of functions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A 6MW doubly-fed wind turbine and a 3MW fluid-coupled wind turbine of a large wind turbine manufacturing enterprise will be taken as an example to describe the implementation of the solution. According to the rated voltage level of the stators of the two types of wind turbine generators and their operation modes, the transformer of the scheme has two operating modes, namely a boost operating mode and a step-down operating mode.
At present, there is no full-power test platform with 6MW and above capacity in China to meet the full power test of 6MW wind turbine. In order to test the installation process and perfect design of the wind turbine before leaving the factory, the transmission chain transmission test is needed.
At this time, the doubly-fed generator needs to short-circuit the rotor to operate in electric mode. The stator-side rated voltage of the 6MW doubly-fed wind turbine generator is 6.6kV, and the rated grid voltage is 690V. In order to meet the test requirements, the transformer should be increased from 690V. It rises to 6.6kV and the transformer capacity needs to be greater than the starting power of the 6MW doubly-fed generator.
Grid switch network side converter step-down transformer generator drive inverter 1 rated capacity: 2000kVA primary rated voltage: 690V1 rated current: 1674A secondary rated capacity: 2000kVA secondary rated voltage: 6600V secondary rated current: 175A high voltage tap: ±5% connection group label: Ydll (high voltage Y connection) times rated capacity: 3300kVA primary rated voltage: 10000V times rated current: 191A secondary rated capacity: 3300kVA secondary rated voltage: 690V secondary rated current: 2765A short-circuit impedance: UK=7% connection group label: Ydll (high-voltage Y connection) principle topology diagram in boost operation mode At this time, the primary side of the transformer is connected to the grid voltage value of 690V power supply, and then rises to 6.6kV through the step-up transformer. Connected to the 6MW doubly-fed wind turbine generator, and in order to meet the requirements of the 6MW doubly-fed wind turbine drive test, its capacity should be greater than 2000kVA. Table 1 Technical parameters of the boost operating mode Wind turbine full power test platform means Establish a power test platform for various types of tests on wind turbines on the ground, which requires the amount of wind turbines to be reached. On the test platform, the wind turbine gearbox, generator, converter, control system and other components can be thoroughly tested to verify whether the components can meet the requirements of standards and specifications, to avoid component quality defects; The initial prototype of the unit is verified by design technology and control algorithm, which promotes the digestion and absorption of technology and avoids design defects. As a development platform, it can test the performance of new models or replace new parts. As a platform for system debugging, it can be debugged and debugged. The training platform for the operating personnel; it is also possible to conduct random sampling tests during mass production in the later stage. The rated voltage of the stator side of the 3MW hydraulic coupling type wind turbine generator is 10kV during normal power generation operation. In order to meet the grid connection requirements, the transformer needs to be increased from 10kV to 690V to connect to the grid, and the transformer capacity should be greater than the power generation. The rated power of the machine.
At this time, the transformer side connected to the 3MW hydraulic coupling type fan has a stator side voltage value of 10kV, which is connected to the 690V through the step-down transformer and connected to the principle topology diagram power grid in the step-down operation mode, in order to meet the 3MW hydraulic coupling type. The full power test of wind turbine should have a capacity greater than 3300kVA. Table 2 Technical parameters of the step-down operation mode 2 Conclusion This solution transformer can simultaneously meet the 6MW doubly-fed wind turbine drive train transmission test and 3MW hydraulic coupling type wind turbine Full power test requirements, and the integration of the two operating modes of the transformer can greatly reduce the space occupied by the transformer room, reduce maintenance, and reduce manufacturing costs.
At present, in foreign countries, especially those with more developed wind power industry, they have similar high-power test platforms, and full-power or transmission chain drive tests of wind turbines are carried out on the test platform. During the test, according to the voltage level of the generator, it is necessary to increase the corresponding transformer so that the grid voltage can be boosted or stepped down to reach the rated voltage level of the generator stator. The existing test bench transformers in China are mostly used in a single way, and simply meet the test requirements of a wind turbine generator. The transformer provided by this scheme can be compatible with the completion of the 6MW doubly-fed wind turbine drive train transmission test and the full power test of the 3MW hydraulic coupling type wind turbine, which can better save manufacturing and infrastructure costs and ensure the realization of functions.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A 6MW doubly-fed wind turbine and a 3MW fluid-coupled wind turbine of a large wind turbine manufacturing enterprise will be taken as an example to describe the implementation of the solution. According to the rated voltage level of the stators of the two types of wind turbine generators and their operation modes, the transformer of the scheme has two operating modes, namely a boost operating mode and a step-down operating mode.
At present, there is no full-power test platform with 6MW and above capacity in China to meet the full power test of 6MW wind turbine. In order to test the installation process and perfect design of the wind turbine before leaving the factory, the transmission chain transmission test is needed.
At this time, the doubly-fed generator needs to short-circuit the rotor to operate in electric mode. The stator-side rated voltage of the 6MW doubly-fed wind turbine generator is 6.6kV, and the rated grid voltage is 690V. In order to meet the test requirements, the transformer should be increased from 690V. It rises to 6.6kV and the transformer capacity needs to be greater than the starting power of the 6MW doubly-fed generator.
Grid switch network side converter step-down transformer generator drive inverter 1 rated capacity: 2000kVA primary rated voltage: 690V1 rated current: 1674A secondary rated capacity: 2000kVA secondary rated voltage: 6600V secondary rated current: 175A high voltage tap: ±5% connection group label: Ydll (high voltage Y connection) times rated capacity: 3300kVA primary rated voltage: 10000V times rated current: 191A secondary rated capacity: 3300kVA secondary rated voltage: 690V secondary rated current: 2765A short-circuit impedance: UK=7% connection group label: Ydll (high-voltage Y connection) principle topology diagram in boost operation mode At this time, the primary side of the transformer is connected to the grid voltage value of 690V power supply, and then rises to 6.6kV through the step-up transformer. Connected to the 6MW doubly-fed wind turbine generator, and in order to meet the requirements of the 6MW doubly-fed wind turbine drive test, its capacity should be greater than 2000kVA. Table 1 Technical parameters of the boost operating mode Wind turbine full power test platform means Establish a power test platform for various types of tests on wind turbines on the ground, which requires the amount of wind turbines to be reached. On the test platform, the wind turbine gearbox, generator, converter, control system and other components can be thoroughly tested to verify whether the components can meet the requirements of standards and specifications, to avoid component quality defects; The initial prototype of the unit is verified by design technology and control algorithm, which promotes the digestion and absorption of technology and avoids design defects. As a development platform, it can test the performance of new models or replace new parts. As a platform for system debugging, it can be debugged and debugged. The training platform for the operating personnel; it is also possible to conduct random sampling tests during mass production in the later stage. The rated voltage of the stator side of the 3MW hydraulic coupling type wind turbine generator is 10kV during normal power generation operation. In order to meet the grid connection requirements, the transformer needs to be increased from 10kV to 690V to connect to the grid, and the transformer capacity should be greater than the power generation. The rated power of the machine.
At this time, the transformer side connected to the 3MW hydraulic coupling type fan has a stator side voltage value of 10kV, which is connected to the 690V through the step-down transformer and connected to the principle topology diagram power grid in the step-down operation mode, in order to meet the 3MW hydraulic coupling type. The full power test of wind turbine should have a capacity greater than 3300kVA. Table 2 Technical parameters of the step-down operation mode 2 Conclusion This solution transformer can simultaneously meet the 6MW doubly-fed wind turbine drive train transmission test and 3MW hydraulic coupling type wind turbine Full power test requirements, and the integration of the two operating modes of the transformer can greatly reduce the space occupied by the transformer room, reduce maintenance, and reduce manufacturing costs.
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