Calculation method of output power frequency short-circuit current of hybrid wind farm
A technology of short-circuit current and mixed wind, which is applied in the direction of only measuring current, measuring current/voltage, measuring electrical variables, etc., which can solve the constraints of power system planning and design, fault protection and safety control, and cannot accurately calculate and evaluate the power frequency of wind farms Short-circuit current and other problems to achieve the effect of improving accuracy
Active Publication Date: 2019-02-19
重庆峰极智能科技研究院有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the analysis of the overall transient characteristics of the hybrid wind farm under the parallel operation of multiple machines has not considered the change of the transient characteristics of the single machine caused by the interaction of the units, and the power frequency short-circuit current output by the wind farm cannot be accurately calculated and evaluated, which restricts the power system. Research and implementation of planning and design, fault protection and safety control, etc.
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
[0057] The present invention aims at the hybrid wind farm composed of doubly-fed wind turbines and direct-drive wind turbines, and considers the interaction between doubly-fed wind turbines and direct-drive wind turbines in the hybrid wind farm. The number of wind turbines corrects the short-circuit current output by the double-fed wind turbines in the wind farm, and calculates the power-frequency short-circuit current output by the hybrid wind farm under a symmetrical short-circuit of the grid through the summation of the corrected short-circuit current of a single wind turbine, which can improve the efficiency of large-capacity hybrid wind power. Accuracy of field short-circuit current calculations.
[0058] Specifically, the present invention firstly divides the fault process of the hybrid wind farm into two stages: fault instant and fault continuation. At the moment of fault, the fault calculation power frequency equivalent circuit of the hybrid wind farm before the start ...
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 discloses a hybrid wind power plant output power frequency short-circuit current calculation method. The method includes: dividing a fault process of each set of a hybrid wind power plant into a fault instant stage and a fault sustaining stage; at the instant of fault, setting up a hybrid wind power plant fault power frequency equivalent circuit before fault ride-through control start, and performing solving to obtain terminal voltage of each set at the instant of fault so as to determine fault ride-through control of each set; at the fault sustaining stage, utilizing a correction expression to calculate power frequency short-circuit current of each doubly-fed wind generation set according to fault ride-through control of each set, and calculating power frequency short-circuit current outputted by the hybrid wind power plant according to a constant value of fault current of a direct-driven wind generation set. Through the method, accuracy in short-circuit current calculation of the high-capacity hybrid wind power plant can be improved, the method can be further used for research and implementation of transient analysis, fault protection and control of a large-scale new energy power system.
Description
technical field [0001] The invention relates to power system fault analysis and short-circuit calculation, and specifically refers to a calculation method for outputting power-frequency short-circuit current of a hybrid wind farm composed of double-fed wind turbines and direct-drive wind turbines, belonging to the field of power system analysis. Background technique [0002] Wind power is one of the main power sources for the development of renewable energy in my country, and is considered to be an effective alternative to traditional fossil energy power generation. At present, the annual growth rate of wind power installed capacity exceeds 20%. In some regional power grids, its installed capacity has exceeded 20% of the total system power capacity. Wind power is gradually developing into a mainstream power source in the power grid. Doubly-fed wind turbines and direct-drive wind turbines are the current mainstream models of wind power generation. Compared with traditional fi...
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 Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 欧阳金鑫郑迪唐挺龙毅熊小伏肖超
Owner 重庆峰极智能科技研究院有限公司