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Primary frequency modulation dynamic regulation method and device based on AGC reverse regulation

A reverse adjustment and dynamic adjustment technology, applied in the direction of single-net parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of insufficient action range, long blocking time, low load adjustment rate, etc., and improve the action qualification rate. , to ensure the frequency stability, to ensure the effect of economic benefits

Active Publication Date: 2019-06-21
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of not considering the reverse regulation in non-AGC mode is that when the unit is running in non-AGC mode, its load command value changes relatively smoothly, and the unit load adjustment rate is low, which has little impact on primary frequency regulation
[0005] In actual operation, some regional power grids require that when the grid frequency exceeds the dead zone ±0.033Hz but does not reach the limit of ±0.1Hz, it will be included in the assessment management. The index is not up to the standard; at the same time, if the frequency exceeds the limit value, the blocking time is too long, which may cause an excessive deviation between the load command of the unit and the actual power, affect the AGC assessment index value, and is not conducive to the safe and stable operation of the unit
In addition, due to the insufficient range of a frequency regulation compensation action, the frequency fluctuation of the power grid will increase, and the time for the power grid frequency to recover and stabilize will be prolonged.
Therefore, under the existing AGC and primary frequency regulation control mode of the unit, the impact of AGC and primary frequency regulation on the load of the unit has not been analyzed and adjusted in a targeted manner. The actual economic benefits of the power plant, on the other hand, the insufficient action range of the unit's primary frequency regulation is not conducive to the stability of the grid frequency

Method used

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  • Primary frequency modulation dynamic regulation method and device based on AGC reverse regulation
  • Primary frequency modulation dynamic regulation method and device based on AGC reverse regulation
  • Primary frequency modulation dynamic regulation method and device based on AGC reverse regulation

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Embodiment 1

[0042] see Figure 4 , Figure 4 It is a flow chart of a dynamic adjustment method for primary frequency modulation considering AGC reverse adjustment provided by the embodiment of the present application.

[0043] First, monitor whether the frequency fluctuation of the power grid exceeds the limit. If it is in the limit state, judge whether the unit is in the AGC dynamic adjustment process. If it is in the dynamic adjustment process, judge whether there is AGC and primary frequency regulation reverse adjustment at this time. In the working condition, according to the AGC and the time point of the primary frequency regulation action, the difference compensation adjustment calculation is performed on the primary frequency regulation compensation amount, and the load increment required for the difference compensation adjustment is superimposed on the original primary frequency regulation compensation amount to calculate the unit load target value dynamic compensation adjustment...

Embodiment 2

[0051] The present application also provides a primary frequency modulation dynamic compensation adjustment device based on performance index evaluation, see figure 2 , figure 2 It is a schematic structural diagram of a primary frequency modulation dynamic adjustment device considering AGC reverse adjustment provided by the embodiment of the present application.

[0052] The device includes: a first subtractor module, a second subtractor module, a third subtractor module, a first pure hysteresis module, a second pure hysteresis module, a first high and low limit alarm module, a second high and low limit alarm module, a timer module, comparator module, first multiplier module, second multiplier module, first analog selector module, second analog selector module, first logical AND module, second logical AND module, logical OR module, etc. .

[0053] The load command value after the rate limit is sent to the first input terminal X1 of the first subtractor module DEV1 all the ...

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Abstract

The invention discloses a primary frequency modulation dynamic regulation method and device based on AGC reverse regulation. When the frequency fluctuation of a power grid exceeds a limit, according to whether a unit is in an AGC dynamic regulation process or not, whether AGC and primary frequency modulation reverse regulation exists or not is judged, and if a reverse regulation condition exists,difference compensation regulation calculation is carried out on a primary frequency modulation compensation amount according to a time point of an AGC and primary frequency modulation action; a loadincrement of required difference compensation regulation is superposed to the original primary frequency modulation compensation amount; and dynamic compensation regulation of a target value of a loadof the unit is carried out. The range of the primary frequency modulation action can be effectively ensured to meet the requirement of power grid frequency compensation; the accuracy of primary frequency modulation response of dispatching in the thermal power unit is improved; the action percent of pass is improved; and the frequency fluctuation of a power grid system is reduced.

Description

technical field [0001] The invention relates to the field of network source coordination of thermal power units, in particular to a dynamic adjustment method and device for primary frequency modulation considering AGC reverse adjustment. Background technique [0002] With the grid connection of new energy, load growth and the continuous increase of the scale of the power grid, as well as the increase in the installed capacity of the power industry in my country and the increase in the peak-to-valley load difference on the power side, in order to ensure the safe and stable operation of the power grid, all large-scale thermal power units require Putting in the AGC function requires the unit to be able to quickly, accurately and stably respond to changes in load commands issued by the power grid. At the same time, primary frequency regulation requires the unit to have the ability to respond to grid frequency changes after being connected to the grid. Since the frequency adjustm...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/48
Inventor 李军杨朋威王昕钱文晓王晓涛孟祥荣陈肖璐高嵩庞向坤张用李娜佟新元孙晓达王达郑婷婷
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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