A method based on water side bypass cutting high pressure heater to participate in unit primary frequency regulation
A high-voltage heater and high-voltage door-adjusting technology, which is applied to machines/engines, lighting and heating equipment, preheating, etc., can solve the problems of lack of power supply load, increased unit load, and large valve throttling loss, and achieve economical operation. Effect
Active Publication Date: 2019-04-26
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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Problems solved by technology
However, since the control door is fully open, that is, it loses the ability to continue to open the control door to increase the load of the unit quickly. How to meet the performance requirements of the power grid dispatching for the unit's primary frequency regulation 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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[0031] For a certain 1000MW ultra-supercritical steam turbine unit, usually adopts the economic mode of high-pressure valve full-open sliding pressure operation, and according to its heat balance diagram, the extracted steam energy storage of the high-pressure heater can be calculated, as shown in Table 1 below.
[0032] Table 1 Theoretical calculation amount of 1000MW unit high pressure heater shedding load increase
[0033]
[0034] It can be seen from Table 1 that under the rated load of the unit, cutting off all the high-pressure heaters can theoretically increase the output of the unit by 131.5MW. The 1000MW adopts the double-column arrangement of high-pressure heaters, and only the A-column high-pressure heaters can be removed, so that the output can be increased by half under the rated load theoretically, that is, an increase of 75.7MW.
[0035] The specific steps for removing the high-pressure heaters in column A to participate in a frequency modulation load through...
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The invention relates to a method for removing a high-pressure heater based on a waterside bypass to participate in primary frequency modulation of a unit. According to the method, an economical operating mode of full opening of a high-pressure control valve is kept, the high-pressure heater is rapidly removed by the aid of the waterside bypass of the high-pressure heater when grid frequency is reduced to a set threshold value, so that stored energy of steam extraction of the high-pressure heater is released, a function of rapid loading through primary frequency modulation is realized. Compared with the prior art, the method can realize economical operation and meet the requirement for the primary frequency modulation, has great significance for a large number of throttling steam distribution units, and can further promote energy conservation and emission reduction of a thermal power generating unit.
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 to a method based on water-side bypass cutting high-pressure heaters to participate in the primary frequency regulation of the set. 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 grid frequency, and ac...
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IPC IPC(8): F22D5/26F01K7/34F01K7/38
CPCF01K7/345F01K7/38F22D5/26
Inventor 姚峻祝建飞李晓峰归一数沈建峰程际云王煦毛哲峰
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG