A method, device and system for controlling power-limited operation of a fan

Abstract

The invention provides a fan limited-power operation control method, device and system. The fan limited-power operation control method includes steps of receiving limited-power operation commands including power set values of a fan during limited-power operation from dispatching equipment in a wind power plant; acquiring a linear-proportion coefficient between rotation speed set values and electromagnetic torque set values of the fan according to nominal parameters of the fan and the optimal gain when the fan is under control of the optimal gain; acquiring target rotation speed required by the fan according to the linear-proportion coefficient, the nominal parameters and the power set values of the fan. By the fan limited-power operation control method, faults caused by mismatching of the output power set value of the fan and active power having large bias with actual power of the fan are avoided.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a power-limited operation control method, device and system of a wind turbine. Background technique [0002] figure 1 is the electrical schematic diagram of the passive rectification converter in the prior art, figure 2 It is a graph of the relationship between the fan speed given value and the fan electromagnetic torque given value in the prior art; figure 1 As shown, the AC voltage (W1, V1, U1, W2, V2, U2) output by the generator 10 of the fan is connected to the diode rectifier circuit 12 after the AC voltage passes through the capacitance compensation circuit 11 of the delta connection, and is rectified by the rectifier circuit 12 Then get the DC voltage U AB , DC voltage U AB through the reactor L 1 , L 2 , L 3 , Diode D 1 、D 2 、D 3 , Insulated Gate Bipolar Transistor (Insulated Gate Bipolar Transistor, referred to as IGBT) T 1 , T 2 , T 3 The cho...

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Problems solved by technology

When the grid power is limited, if the wind speed reaches the rated wind speed, the wind turbine needs to be rated by the rated power curve JHM (corresponding power is P rated (w)) is reduced to the power value required by the grid. During the adjustment process, the output power of the generator 10 will remain unchanged for a long time. For the fan with a smaller optimal control gain value, the higher fan speed will be As a result, the stator terminal voltage of the generator 10 is higher, so the DC voltage rectified by the diode circuit 12 is very close to the DC bus voltage of the converter. At this time, the chopper circuit 14 is basically in an uncontrollable state, and the fan will report Fault that active power does not match due to large difference between output power given value and output power actual value

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