Primary frequency modulation test method under megawatt unit rated load condition

Abstract

The invention relates to a primary frequency modulation test method under a megawatt unit rated load condition. The method comprises the steps of optimizing the value of the opening overlapping degree of a gulp valve under a total flow characteristic curve, and setting the opening degree of the gulp valve below 8%, so as to guarantee that the gulp valve cannot be automatically closed when the load is reduced after the gulp valve is opened in advance. The primary frequency modulation test comprises the steps that when the opening degree of a gulp valve is set to be 8%, the unit reaches the rated load and the position of a high control valve is 31%, a primary frequency modulation test button is put in, the rotating speed is set to be 2994 r/min, when the load of the unit reaches 103% of the rated load, after keeping for 1 minute, the rotating speed is restored to be 3000 r/min, the primary frequency modulation test button is quitted, and the test is completed. By optimizing the control strategy of the gulp valve, the valve design of a 1000MW ultra-supercritical intermediate reheating four-cylinder four-exhaust condensing steam turbine can participate in the adjustment of the primary frequency modulation of the unit; the high valve opening degree of the unit under the rated load is reduced, so that the adjusting margin under the rated load is increased, and meanwhile, the flow inflection point of a valve characteristic curve is effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a primary frequency regulation test method under the rated load working condition of one million units. Background technique [0002] When the units are connected to the grid, the frequency of the power grid is affected by the change of the external load. At this time, the regulation system of each unit participates in the adjustment function, changing the load carried by each unit to balance it with the external load. At the same time, try our best To reduce the change of grid frequency, this process is a frequency regulation. [0003] According to the national standard of the People's Republic of China GB / T 30370-2013 "Guidelines for Primary Frequency Regulation Test and Performance Acceptance of Thermal Power Generating Units": Units operating at rated loads should participate in primary frequency regulation, and the maximum frequency regulation lo...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a one-time frequency modulation test method under the rated load condition of one million units, aiming at supplementing air for SAIC N1000-28/600/620 type 1000MW ultra-supercritical intermediate reheating four-cylinder four-exhaust steam condensing steam turbine The valve design is unreasonable, and the throttling characteristics are poor. Participating in the adjustment of the unit will easily cause the vibration of the unit to increase, endangering the safety of the unit. For the poor or no throttling characteristics of the air supply valve, it is impossible to participate in the

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