Method for participating primary frequency modulation loading function of unit by removing valve at steam side of low-pressure heater
A low-pressure heater and load-loading technology, applied in steam engine installations, machines/engines, mechanical equipment, etc., can solve the problems of lack of power supply load, large throttle throttling loss, increased unit load, etc., to achieve the effect of economical operation
Active Publication Date: 2017-01-11
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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Problems solved by technology
However, since the control door is fully open, that is to say, the means of continuously opening the control door to increase the load of the unit quickly is lost. How to meet the performance requirements of the power grid dispatching for the primary frequency regulation of the unit is a big problem.
Especially in the context of the current UHV power grid and large-scale DC transmission, once the power supply load at the receiving end is lost due to transmission line failure, the frequency of the grid drops rapidly, and the local unit needs to quickly increase the load to achieve the primary frequency regulation function. Therefore, these throttling There is a large contradiction between the economical operation mode of the steam distribution unit and the primary frequency regulation capability
[0004] In order to meet the performance requirements of primary frequency regulation, many domestic units of this type have to close the high-voltage valve and adopt the mode of throttle operation, which sacrifices a large economy, especially under low load, the throttling loss of the valve is even greater
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[0030] For a 1000MW ultra-supercritical steam turbine unit, usually adopts the economic mode of high-pressure valve full-open sliding pressure operation, according to its heat balance diagram, the extraction and storage of low-pressure heaters can be calculated, as shown in Table 1 below.
[0031] Table 1 Theoretical calculation amount of 1000MW unit low pressure heater shedding load increase
[0032]
[0033] It can be seen from Table 1 that under the rated load of the unit, all the low-pressure heaters on the steam side can theoretically increase the output of the unit by 53.5MW, and cutting off #5 and #6 low-pressure heaters can increase the output of the unit by 42.4MW.
[0034] The specific steps to participate in a frequency modulation load by cutting off the low-pressure heater are as follows:
[0035] When the frequency of the power grid drops beyond a certain level, the logic automatically judges the large frequency difference signal and issues an instruction to cu...
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The invention relates to a method for participating a primary frequency modulation loading function of a unit by removing a valve at a steam side of a low-pressure heater. The method is characterized in that a wide-open economic operation mode of a high-pressure control valve is kept; when frequency of a power grid is reduced to a set threshold value, accumulated energy for steam extraction of a low-pressure heater is released by removing the valve at the steam side of the low-pressure heater, so that the primary frequency modulation loading function is realized. Compared with the prior art, the method can realize economic operation and also can meet primary frequency modulation requirements, and is of great significance on a plurality of throttling and steam-distributing units, so that energy conservation and emission reduction of a thermal power generating unit are further promoted.
Description
technical field [0001] The invention relates to the field of automatic control of thermal power generator sets, and is mainly applicable to steam turbine sets with full-circle throttling and steam distribution, and in particular relates to a method for removing the steam side valve of a low-pressure heater from participating in the unit's primary frequency regulation and loading. Background technique [0002] Since electric energy is difficult to store on a large scale, the power grid needs to maintain a balance between power consumption and power generation at all times, and the frequency of the power grid is an important indicator to reflect this situation. When the power consumption load is greater than the power generation load, the grid frequency will drop; conversely, when the power generation load is greater than the power consumption load, the grid frequency will increase. Primary frequency regulation means that the unit directly receives the deviation signal of the ...
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Login to View More IPC IPC(8): F01K7/34F01K7/38
CPCF01K7/345F01K7/38
Inventor 归一数沈丛奇夏杰祝建飞卢宏林王念龙陈欢乐吴周晶
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG