Priority adjusting method and system for primary frequency modulation of unit plant
A technology of unit unit and adjustment method, applied in control/adjustment system, general control system, computer control, etc., can solve the problems of slow response of secondary frequency modulation, attenuation of secondary frequency modulation, non-directional adjustment, etc., to maintain stable and safe operation , reduce the time, avoid the effect of decay
Active Publication Date: 2014-05-07
STATE GRID CORP OF CHINA +1
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Problems solved by technology
The current control scheme does not consider the priority adjustment of the primary frequency regulation, and at the same time, due to the lag of the secondary frequency regulation, it will lead to different adjustments between the primary frequency regulation and the secondary frequency regulation. At this time, the first frequency regulation immediately acts to generate a command to reduce the load of the unit, but due to the slow response of the second frequency regulation, the unit load command generated by the second frequency regulation is still increasing at this time, which will cause the actual operation of the first frequency regulation. attenuated by the second FM and vice versa
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[0030] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0031] Such as figure 1 As shown, a method for priority adjustment of primary frequency regulation of a unit unit includes:
[0032] (1) When the load command increases, if the frequency regulation action is a positive adjustment, the load command will not be blocked, and the real-time load command will be output; if the frequency regulation action is a negative regulation, the load command will be blocked, and the current load command will be maintained. The amount of action is adjusted, and the load command does not affect it.
[0033] (2) When the load command decreases, if the frequency regulation action is a negative regulation, the load command will not be blocked, and the real-time load command will be output; if the frequency regulation action is a positive regulation, the load command will be blocked, and the current load command will be maintained,...
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The invention discloses a priority adjusting method and system for primary frequency modulation of a unit plant. The method comprises the steps that when a load command is increased, if the primary frequency modulation motion is positive adjustment, the load command is not locked, and a real-time load command is output; if the primary frequency modulation motion is negative adjustment, the load command is locked, and the current load command is kept; when the load command is decreased, if the primary frequency modulation motion is negative adjustment, the load command is not locked, and the real-time load command is output; if the primary frequency modulation motion is positive adjustment, the load command is locked, and a the current load command is kept. The method and system have the advantages that in grid frequency fluctuations, primary frequency modulation adjustment is preferentially carried out, the motion amplitude of the primary frequency modulation is stabilized, the phenomenon that due to the fact that the load command of a unit is different from that of the primary frequency modulation, attenuation happens to the real motion amplitude of the primary frequency modulation is avoided, the time for stabilizing the power grid frequency can be reduced, and stable and safe running of the power grid is maintained.
Description
technical field [0001] The invention relates to the field of unit unit unit frequency regulation, in particular to a method and system for unit unit unit unit unit frequency regulation priority adjustment method and system. Background technique [0002] The primary frequency regulation of the unit unit is calculated by directly collecting the frequency deviation of the power grid or the generator speed deviation. It is caused by the change of ACE (area control deviation), and its working mode is power closed loop. In a coordinated-controlled thermal power generation unit, the response time of the primary frequency regulation is within 3 seconds. Due to the time limit of the energy conversion process, the response of the secondary frequency regulation to the system load change is much slower than that of the primary regulation. Its response time generally takes 1 to 2 minutes. [0003] Due to the difference in characteristics between the primary frequency modulation and the...
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IPC IPC(8): G05B19/042
Inventor 庞向坤孟祥荣韩英昆于庆斌高嵩李克雷林波
Owner STATE GRID CORP OF CHINA