A control method for eliminating electromagnetic torque overshoot phenomenon of squirrel-cage wind turbine
A technology of wind power generator and electromagnetic torque, which is applied in the direction of wind power generation, control generator, control system, etc., can solve the problems of electromagnetic torque overshoot, large electromagnetic torque, etc., and achieve the effect of eliminating electromagnetic torque overshoot
Active Publication Date: 2021-07-30
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Although this increases the transient stability margin and low voltage ride-through capability, it also produces a large electromagnetic torque, which may even lead to the phenomenon of electromagnetic torque overshoot
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[0026] A control method for eliminating the electromagnetic torque overshoot phenomenon of a squirrel-cage wind-driven generator, said method is through the electromagnetic torque automatic adjustment control of controlling the voltage of the voltage control loop of the reactive power compensation device of the squirrel-cage wind-driven generator method, said method comprising:
[0027] The rotor current I is measured by the current transformer installed on the rotor of the squirrel-cage wind turbine d , by τ em =C m ×I d Calculate the electromagnetic torque τ em , where C m is the torque coefficient of the squirrel-cage wind turbine;
[0028] According to the electromagnetic torque τem and τ em The change trend of electromagnetic torque τ em Perform linear extrapolation to calculate the average rate of change r of the electromagnetic torque, assuming the current time is t 0 , then the formula for calculating the average rate of change r is Among them, τ em (t 0 ) ...
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A control method for eliminating the electromagnetic torque overshoot phenomenon of a squirrel-cage wind-driven generator, the method is through the automatic adjustment of the electromagnetic torque by controlling the voltage of the voltage control loop in the reactive power compensation device of the squirrel-cage wind-driven generator A control method, the method comprising: calculating the electromagnetic torque by obtaining the rotor current measured by a current transformer installed on the rotor of the squirrel-cage wind power generator; performing linear extrapolation on the electromagnetic torque, and calculating the average rate of change of the electromagnetic torque , through the electromagnetic torque control value, calculate the voltage control value of the voltage control loop of the reactive power compensation device, and further calculate the conduction angle of the thyristor in the reactive power compensation device, and eliminate the squirrel-cage wind turbine during the recovery period by controlling the conduction of the thyristor Electromagnetic torque overshoot phenomenon. Through the improved electromagnetic torque automatic adjustment control method based on linear prediction, the electromagnetic torque overshoot phenomenon of the squirrel-cage wind turbine in the process of fault recovery is eliminated.
Description
technical field [0001] The invention belongs to the technical field of control of wind power generating sets, and relates to a control method for eliminating the phenomenon of electromagnetic torque overshoot in the fault recovery process of a squirrel-cage wind power generator with a reactive power compensation device (STATCOM), in particular to a method for eliminating A control method for electromagnetic torque overshoot phenomenon of squirrel-cage wind turbine. Background technique [0002] There are many researches on the electromagnetic torque control of (double-fed, permanent magnet) variable speed wind turbines. However, there are still few researches on the electromagnetic torque control of constant-speed squirrel-cage wind turbines. Most of the wind turbines in the installed wind farms are squirrel-cage wind turbines. Therefore, it is necessary to study the electromagnetic torque control method of the squirrel-cage wind turbine, so as to reduce the impact force o...
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IPC IPC(8): H02J3/38H02J3/18H02J3/16H02P9/00H02P101/15
CPCH02J3/386H02J3/16H02J3/1885H02P9/00H02P2101/15Y02E10/76Y02E40/30
Inventor 尹俊
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER