Novel megawatt wind generating set testing system and testing method thereof

[0008] The present invention will be described in further detail below in conjunction with the accompanying drawings: see figure 1 with 2 , A megawatt-class wind turbine test system, the system includes 10kv incoming switch cabinet, distribution transformer, power receiving cabinet, full power converter, double shaft extension motor, coupling, torque meter, deceleration Gearbox, wind turbine simulator, converter (different converters are used for different units), transfer switch cabinet, feeder cabinet, plc, center console, power quality analyzer, power measuring instrument, waveform recorder, etc. Measuring equipment; the industrial power grid is connected to the distribution transformer through the 10kv incoming switch cabinet. The distribution transformer reduces the voltage to 690V and supplies the power receiving cabinet and the full power converter to drive the drag motor; the two-axis extension drag motor ( One end) can also be connected to the coupling, torque meter, reduction gear box, and wind turbine simulator in turn; the wind turbine simulator is then connected to the corresponding wind generator to generate electrical energy; the generator then passes through the corresponding converter (dual-fed Converter or full-power converter) is connected to the transfer switch cabinet; the transfer switch cabinet feeds the current back to the distribution transformer through the feed cabinet to form a complete current loop; the incoming control cabinet, the receiving cabinet, and the feeder The electric cabinet and all converters are connected to the PLC and the console through optical fiber; the power quality analyzer analyzes the power quality of key points (see the location attachment for details) figure 1 ), measuring equipment such as power measuring instrument and waveform recorder are connected to the switch cabinet to measure the current generated, and the LVRT device is used to detect the low voltage ride through capability of the unit under test.

[0009] The two-axis extension motor of this test system has output shafts at both ends, which can carry loads at both ends. The motor has the following advantages: (1) It is convenient to test different types of units at both ends, and it also facilitates the construction of the test bench foundation. One end can test high-speed motors, and the other end can be tested directly by adding reduction gearboxes, adapters, etc. (2) It is convenient to realize capacity expansion and phased construction, and the use of two identical motors can realize the construction characteristics of the test station in phases; (3) One-time investment can be reduced, because the test station's test capacity range (0MW~ 5.6MW) is larger, and the number of drag motors and corresponding inverters can be determined according to the test capacity requirements. If the capacity of the test equipment is below 2.8MW, one drive motor and frequency converter can be put into operation; otherwise, two identical motors and corresponding frequency converters can be used to facilitate the test of equipment with a capacity greater than 2.8MW; (4) Can be reduced It is difficult to use inverters for small drag motors. Using two double-shaft extension motors can be equipped with inverters of considerable capacity, which reduces the difficulty of manufacturing low-voltage high-power inverters.

[0010] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be considered that the specific embodiments of the present invention are limited to this. For those of ordinary skill in the art to which the present invention belongs, without departing from the concept of the present invention Below, you can also make some simple deductions or substitutions, all of which should be regarded as belonging to the invention and the scope of patent protection determined by the submitted claims.