Control method for eliminating overshoot phenomenon of squirrel-cage wind driven generator electromagnetic torque
A wind turbine, electromagnetic torque technology, applied in wind power generation, control generators, control systems, 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: 2018-11-13
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
View PDF7 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] A control method for eliminating the electromagnetic torque overshoot phenomenon of a squirrel-cage wind generator, the method is an electromagnetic torque automatic adjustment control by controlling the voltage of a voltage control loop of a reactive power compensation device of a squirrel-cage wind generator method, the method includes:
[0027] The rotor current I is obtained by measuring 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 τ em and τ em The changing 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 , the formula for calculating the average rate of change r is: where τ em (t 0 ) is t 0 Electromagnetic torque...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a control method for eliminating the overshoot phenomenon of a squirrel-cage wind driven generator electromagnetic torque. The method is an electromagnetic torque automatic adjusting and controlling method for controlling a voltage of a voltage control loop in a reactive compensation apparatus of a squirrel-cage wind driven generator. The method comprises the following steps: measuring rotor current by virtue of a current transformer installed on a rotor of the squirrel-cage wind driven generator, and calculating the electromagnetic torque; performing the linear extrapolation for the electromagnetic torque, calculating an average change rate of the electromagnetic torque, calculating a voltage control value of a voltage control loop of the reactive compensation apparatus by virtue of the electromagnetic torque control value, further calculating conduction angle of a thyristor in the reactive compensation apparatus, and eliminating the electromagnetic torque overshoot phenomenon in a fault restoration period of the squirrel-cage wind driven generator by controlling the conduction of the thyristor. By adopting the electromagnetic torque automatic adjusting controlling method based on the linear prediction improvement, the electromagnetic torque overshoot phenomenon of the squirrel-cage wind driven generator in the fault restoration process can be eliminated.
Description
technical field [0001] The invention belongs to the technical field of wind turbine control, and relates to a control method for eliminating electromagnetic torque overshoot in a squirrel-cage wind turbine with a reactive power compensation device (STATCOM) during fault recovery, in particular to a method for eliminating electromagnetic torque overshoot. Control method of electromagnetic torque overshoot phenomenon of squirrel-cage wind turbine. Background technique [0002] There have been many studies on electromagnetic torque control of variable speed wind turbines (double-fed, permanent magnet). However, there are few studies on the electromagnetic torque control of fixed-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 on the mechanical part of the tran...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
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