Primary frequency regulation load increase method of participation units through cutting low-pressure heaters from water side
A low-pressure heater and load-adding technology, which is applied in the direction of feed water heaters, machines/engines, lighting and heating equipment, etc., can solve problems such as lack of power supply load, increase unit load, and large loss of throttling, so as to achieve economical operation Effect
Active Publication Date: 2017-02-01
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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[0035] 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.
[0036] Table 1 Theoretical calculation amount of 1000MW unit low pressure heater shedding load increase
[0037]
[0038] 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 when the load is 500MW, the output of the unit can be increased by 20.3MW.
[0039] The specific steps to participate in a frequency modulation load by cutting off the water side of the low-pressure heater are as follows:
[0040] When the frequency of the power grid drops beyond a certain level, the logic automatically judges the large frequency difference signal, and issues a command to cut...
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The invention relates to a primary frequency regulation load increase method of participation units through cutting low-pressure heaters from the water side. The method is characterized in that the economic operation manner of opening all high-pressure control valves is maintained, when the grid frequency decreases to a threshold value, the low-pressure heaters are cut from the water side through closing a water inlet valve of the low-pressure heaters, the stored energy of steam extraction of the low-pressure heaters is released, and the function of load increase through primary frequency regulation is achieved. Compared with the prior art, the method has the advantages that economic operation is achieved, the requirement on primary frequency regulation can be met, the method has important meaning for a plurality of throttle steam distribution units, and energy conservation and emission reduction of a thermal power unit are further facilitated.
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 cutting off the water side of a low-pressure heater to participate in the primary frequency regulation and loading 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 gri...
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IPC IPC(8): F01K7/34F01K7/38F22D1/32F22B35/00
CPCF01K7/345F01K7/38F22B35/00F22D1/325
Inventor 祝建飞姚峻归一数曹卫峰沈建峰朱宇新邱寅祺陈梁
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG