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A method for setting the speed unequal rate function of primary frequency modulation

A technology of speed unequal rate and function, applied in the field of rate function setting, can solve problems such as unfavorable power grid frequency stability, reducing unit economy, and increasing the number of inspections.

Active Publication Date: 2017-12-15
STATE GRID CORP OF CHINA +3
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  • Claims
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AI Technical Summary

Problems solved by technology

In the existing typical speed unequal function setting method, this problem is especially obvious in the small fluctuation range of the grid frequency, which is not only not conducive to the stability of the grid frequency, but also increases the possibility of the unit being assessed due to the decline in the primary frequency regulation performance. Thereby reducing the economy of unit operation

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  • A method for setting the speed unequal rate function of primary frequency modulation
  • A method for setting the speed unequal rate function of primary frequency modulation
  • A method for setting the speed unequal rate function of primary frequency modulation

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Taking a 300MW subcritical thermal power unit as the implementation object, set its primary frequency modulation speed unequal rate function according to the method described in the application of the present invention.

[0024] (1) Determine the small fluctuation range of the unit speed

[0025] Take the unit speed signal w within 24 hours of the unit, and count its fluctuation range. The statistical results are: the maximum speed is 3002.9r / min, the minimum is 2997.8r / min, and the maximum speed deviation Δw is calculated max :

[0026]

[0027] (2) Set the speed unequal rate function

[0028] (2.1) Determine the maximum / minimum value of the frequency modulation power increment of the speed uneven rate supplementary function

[0029] The original speed unequal function f(x) of the thermal power unit, see figure 1 , as shown in the followi...

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Abstract

The invention discloses a method for setting a primary frequency modulation rotating speed droop function. The method is characterized by determining a frequency range, regulating a set by different amplitudes at different frequency bands, and changing the output of the primary frequency modulation rotating speed droop function in real time by using primary frequency modulation actuation time in order to reduce primary frequency modulation disturbance amplitude. The method may reinforce the primary frequency modulation performance of the set when power grid frequency fluctuates within a small range, reduces the number of examining times of the set, and improves the operation economical efficiency of the set. The method enables frequency modulation power increments to tend to consistency when the power grid frequency fluctuates within the small range, contributes to oriented and quantitative regulation of the set, and reduces disturbance of rotating speed fluctuation on the set when the primary frequency modulation functions. The method just influences the primary frequency modulation performance of the set when the power grid frequency fluctuates within the small range and the set is still regulated according to an original rotating speed droop function when the power grid frequency fluctuates within a large range. Accordingly, the method cannot enhance the primary frequency modulation disturbance amplitude when the power grid frequency fluctuates within the large range and is beneficial to the stability of the set.

Description

technical field [0001] The invention belongs to the technical field of primary frequency modulation of thermal power units, and in particular relates to a method for setting a speed unequal rate function of primary frequency modulation. Background technique [0002] Grid frequency is one of the key indicators of grid operation, which reflects the balance between the active power of grid-connected units and the load. When the power grid fails and breaks the balance relationship, the actual frequency will deviate from the rated frequency, and in severe cases, it will cause low-frequency load shedding or high-frequency cut-off. In order to maintain a stable frequency, it needs to be controlled as necessary. The control of grid frequency can be formally divided into primary frequency modulation, secondary frequency modulation and tertiary frequency modulation. Among them, the primary frequency regulation mainly achieves the purpose of stabilizing the frequency by quickly adjus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/38
Inventor 盛锴寻新王伯春傅强朱晓星
Owner STATE GRID CORP OF CHINA
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