A control method for the characteristics of the unit curve transition process in a pumped storage power station
A technology of pumped storage power station and control method, which is applied in the direction of hydroelectric power generation, mechanical equipment, engine components, etc., can solve the problems of small values, increase the difficulty of analysis and control, and affect the efficiency of analysis and control, so as to ensure accuracy and speed, overcome Analyzing the effects of difficulty and poor stability
Active Publication Date: 2021-02-09
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
The Shutter transform method was originally used in the analysis of the transition process of the water pump. Its main purpose is not to solve the interpolation problem, but to solve the difficulties that may arise when the water head fluctuation may cross zero during the transition process of the water pump, and it cannot solve the problem of interpolation distortion well.
The orthogonal interpolation method is to interpolate directly along the direction of the curve orthogonal line in the N11-Q11 full characteristic curve group. This method actually solves the multi-value problem that may occur in the N11 longitudinal or Q11 horizontal interpolation. However, due to the transition process calculation The step size is generally small, and at each time step, it is necessary to perform orthogonal interpolation according to the new guide vane opening to obtain the stable operating point of the unit. Therefore, the use of orthogonal interpolation will greatly increase the difficulty of analysis and control, and serious Impact Analysis Control Efficiency
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[0027] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0028] A method for controlling characteristics of a unit curve transition process in a pumped storage power station, comprising the following steps:
[0029] S1) Partition the hydraulic characteristic curve of the unit
[0030] According to the curvature radius of the curve, the characteristic curve is divided into three different areas: longitudinal interpolation area, orthogonal interpolation area and horizontal interpolation area, and the characteristic curve data of the three partitions are stored for use in characteristic control.
[0031] The method for judging whether the radius of curvature of a point on a curve is large or small is as follows: if the radius of curvature of the point is smaller than the horizontal or vertical distance from the point to the outer curve, it can be judged as a small radius of curvature; if the radius of c...
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The present invention provides a method for controlling characteristics of a unit curve transition process in a pumped-storage power station, comprising the following steps: S1) partitioning the curve; S2) selecting a characteristic control method; S3) performing control estimation of the curve characteristic at a certain moment; S4), Obtain the guide vane opening K1 and guide vane opening change ΔK corresponding to the next moment; S5) make a comprehensive judgment based on the operating condition point P0 and guide vane opening change ΔK at the previous moment. The invention has the advantages of ensuring the accuracy and speed of the transition process control method, being widely used in the design and operation of the pumped storage power station, and better serving the project.
Description
technical field [0001] The invention relates to the engineering technical field of a pumped storage power station, in particular to a method for controlling the characteristics of a unit curve transition process in a pumped storage power station. Background technique [0002] In order to improve the stability of the power grid, pumped storage power stations have been constructed on a large scale in recent years. In the design stage of the pumped storage power station, it is necessary to analyze the transition process to review the operation safety of the power station. A major difficulty in the analysis of the transition process of pumped storage power plants is the control of the curve characteristics of its reversible units. [0003] The hydraulic characteristics of the reversible unit of the pumped storage power station and the mixed flow unit of the conventional hydropower station are very different. For the characteristic curve of the mixed-flow unit, the slope of the...
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IPC IPC(8): F03B15/00F03B15/02F03B13/06
CPCF03B13/06F03B15/00F03B15/02Y02E10/20Y02E60/16
Inventor 李高会张春生侯靖吴旭敏陈益民潘益斌周天驰崔伟杰
Owner POWERCHINA HUADONG ENG COPORATION LTD