CN112761746A - Auxiliary frequency modulation system and method based on water side flow splitting mode of low-pressure heater - Google Patents

Auxiliary frequency modulation system and method based on water side flow splitting mode of low-pressure heater Download PDF

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CN112761746A
CN112761746A CN202110115802.7A CN202110115802A CN112761746A CN 112761746 A CN112761746 A CN 112761746A CN 202110115802 A CN202110115802 A CN 202110115802A CN 112761746 A CN112761746 A CN 112761746A
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pressure heater
low
valve
water
regulating valve
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刘世雄
王涛
顿小宝
令彤彤
王海涛
高奎
谭祥帅
辛志波
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30—Exhaust heads, chambers, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/003—Arrangements for measuring or testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)

Abstract

一种基于低压加热器水侧分流方式的辅助调频系统及方法，包括凝结水泵，凝结水泵与第一调节阀入口相连通，第一调节阀出口母管分两路：第一路与第一低压加热器水侧入口相连通、第一低压加热器水侧出口与第二低压加热器水侧入口相连通、第二低压加热器水侧出口与第三低压加热器水侧入口相连通、第三低压加热器水侧出口与除氧器入口相连通，第二路与第二调节阀入口相连通，第二调节阀出口与除氧器入口相连通；所述第二调节阀与凝结水调频控制单元输出开度信号相连接。本发明通过快速开启凝结水旁路调节阀控制低压加热器侧凝结水流量，快速响应一次调频的同时维持凝结水总量不变，减少系统扰动的同时达到快速响应一次调频的目的。

Figure 202110115802

An auxiliary frequency regulation system and method based on a water-side split mode of a low-pressure heater, comprising a condensate pump, the condensate pump is connected to the inlet of a first regulating valve, and the outlet of the first regulating valve is divided into two paths: the first path and the first low-pressure The water side inlet of the heater is communicated with, the water side outlet of the first low pressure heater is communicated with the water side inlet of the second low pressure heater, the water side outlet of the second low pressure heater is communicated with the water side inlet of the third low pressure heater, and the third The outlet of the water side of the low-pressure heater is communicated with the inlet of the deaerator, the second path is communicated with the inlet of the second regulating valve, and the outlet of the second regulating valve is communicated with the inlet of the deaerator; the second regulating valve is connected with the condensate water frequency modulation control The unit output opening signal is connected. The invention controls the flow of condensate on the side of the low-pressure heater by rapidly opening the condensate bypass regulating valve, rapidly responds to the primary frequency modulation while maintaining the total amount of condensed water unchanged, reduces system disturbance and achieves the purpose of rapidly responding to the primary frequency modulation.

Figure 202110115802

Description

Auxiliary frequency modulation system and method based on water side flow splitting mode of low-pressure heater
Technical Field
The invention relates to the technical field of frequency modulation of power plants, in particular to an auxiliary frequency modulation system and method based on a water side flow splitting mode of a low-pressure heater.
Background
The power grid frequency is one of the main indexes of the power quality and is a mark for measuring whether the generated power and the power load are balanced. With the operation of a power grid entering an extra-high voltage AC-DC hybrid operation state, in recent years, the grid loading amount of new energy power generation increases, the peak-to-valley difference of peak-load regulation operation of the power grid increases year by year, the risk of stabilizing the frequency of the power grid caused by power loss also increases, a higher requirement is provided for the stability of the system frequency, and the thermal power generating unit is still the main force of the power grid for responding to the primary frequency modulation capability. The essence of primary frequency modulation is that the active output of a unit is rapidly changed when the frequency of a power grid is disturbed, the power balance and the frequency stability of the power grid are maintained, when the frequency of the power grid is reduced to exceed a certain dead zone, the load of the unit is increased, so that the frequency of the power grid is increased, otherwise, when the frequency of the power grid is increased to exceed the certain dead zone, the load of the unit is reduced, and the frequency of the power grid is reduced. The supercritical thermal power generating unit usually adopts a sliding pressure operation mode, namely, the opening of a steam turbine is enlarged as much as possible to avoid throttling loss in the steam inlet process, and the problem of insufficient rapid load increasing capability of the steam turbine under large frequency difference is caused by the fact that the opening has no adjustment margin.
The condensed water frequency modulation mode has the characteristics of high speed, small amplitude and temporality, accords with the characteristic of primary frequency modulation, and is a primary frequency modulation method researched in recent years. Most of the existing condensed water frequency modulation adopts throttling frequency modulation, the flow of condensed water is reduced through a water feeding regulating valve of a deaerator, the heat balance of a low-pressure heater is influenced, so that the steam extraction quantity of a steam turbine is changed, and the load of a unit is changed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an auxiliary frequency modulation system and method based on a low-pressure heater water side flow dividing mode.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an auxiliary frequency modulation system based on low pressure feed water heater water side reposition of redundant personnel mode, includes condensate pump 1, and condensate pump 1 is linked together with 7 entrys of first governing valve, and 7 female pipes in first governing valve export divide two the tunnel: the first path is communicated with a water side inlet of a first low-pressure heater 3, a water side outlet of the first low-pressure heater 3 is communicated with a water side inlet of a second low-pressure heater 4, a water side outlet of the second low-pressure heater 4 is communicated with a water side inlet of a third low-pressure heater 5, a water side outlet of the third low-pressure heater 5 is communicated with an inlet of a deaerator 8, the second path is communicated with an inlet of a second regulating valve 10, and an outlet of the second regulating valve 10 is communicated with an inlet of the deaerator 8;
the second regulating valve 10 is connected with an opening signal output by the condensed water frequency regulating control unit 15.
And a first stop valve 2 is arranged between the outlet of the first regulating valve 7 and the water side inlet of the first low-pressure heater 3.
And a second stop valve 6 is arranged between the outlet of the water side of the third low-pressure heater 5 and the inlet of the deaerator 8.
And a third stop valve 9 and a fourth stop valve 11 are arranged in front of and behind the second regulating valve 10, a third stop valve input pipeline is connected to a pipeline between the first regulating valve 7 and the first stop valve 2, and a fourth stop valve 11 output pipeline is connected to a pipeline between the second stop valve 6 and an inlet of the deaerator 8.
The steam side inlet of the first low-pressure heater 3 is communicated with a first steam extraction pipeline 12 of the steam turbine, the steam side inlet of the second low-pressure heater 4 is communicated with a second steam extraction pipeline 13 of the steam turbine, and the steam side inlet of the third low-pressure heater 5 is communicated with a third steam extraction pipeline 14 of the steam turbine.
The condensed water frequency modulation control unit 15 is realized by DCS system control logic.
The condensed water frequency modulation control unit 15 comprises a subtracter 16, a first correction module 17, a second correction module 18 and a multiplier 19;
the subtractor 16 is connected with a rotating speed input signal in an input mode, and the rotating speed input signal is used for calculating the rotating speed deviation of the unit; the output of the subtracter 16 is connected with the input of the first correction block 17, and the subtracter 16 is used for converting the theoretical opening value of the second regulating valve 10 according to the deviation of the rotating speed of the unit; the second correction module 18 inputs and is connected with a unit load input signal, and the unit load input signal is used for correcting the valve opening coefficient according to the unit load; the output of the first correction module 17 and the output of the second correction module 18 are respectively connected with the input of a multiplier 19 and used for calculating the actual opening instruction of the valve, and the multiplier 19 outputs the valve opening instruction to be connected with the second regulating valve 10.
An operation method of an auxiliary frequency modulation system based on a low-pressure heater water side flow dividing mode comprises the following steps;
in the process of the unit running with load, a condensate pump 1 runs, condensate sequentially passes through a first regulating valve 7, a first stop valve 2, a first low-pressure heater 3, a second low-pressure heater 4, a third low-pressure heater 5 and a second stop valve 6 to be fed to a deaerator 8, the steam is pumped to the steam extraction side of the low-pressure heater, a condensate bypass third stop valve 9 and a fourth stop valve 10 are in an open state, and the condensate bypass second regulating valve 10 receives an output instruction of a condensate frequency modulation control unit 15;
when the rotation speed of the unit changes, the rotation speed input signal and the rated rotation speed are calculated through the subtracter 16 to obtain a rotation speed deviation signal, the rotation speed deviation signal is connected to the first correction module 17, and the first correction module 17 calculates the theoretical opening instruction of the second regulating valve 10 according to the rotation speed deviation; meanwhile, a unit load input signal is connected to the second correction module 18, and a valve correction coefficient is calculated through the second correction module 18 according to the actual load interval of the unit; the theoretical instruction signal of the second regulating valve and the valve correction coefficient are connected to the input of the multiplier 19, the opening signal of the second regulating valve 10 is obtained through calculation by the multiplier 19, and the opening of the second regulating valve 10 is rapidly changed; when the frequency of the power grid is reduced to exceed a primary frequency modulation dead zone, the second regulating valve 10 is quickly opened, and the flow of condensate water passing through the low-pressure heater is instantly reduced, so that the steam extraction quantity at the steam side of the low-pressure heater is reduced, the steam quantity of the work of the steam turbine is increased, the load is quickly increased, and the unit can quickly respond to the primary frequency modulation requirement.
The invention has the beneficial effects that:
when the auxiliary frequency modulation system based on the water side flow dividing mode of the low-pressure heater works specifically, when the frequency of a unit is reduced to exceed a frequency modulation dead zone, the condensed water bypass regulating valve is quickly opened according to the relation between the condensed water flow and the frequency modulation load, so that the condensed water amount on the side of the low-pressure heater is reduced, the steam extraction amount of a steam turbine is reduced, the working steam amount of the steam turbine is increased, the total amount of the condensed water is kept unchanged while the steam turbine regulating valve is in an economic operation mode, and severe disturbance to other systems is reduced. The invention has the characteristics of high frequency modulation rate, high economy and small interference to a system.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The system comprises a condensate pump 1, a first stop valve 2, a first low-pressure heater 3, a second low-pressure heater 4, a third low-pressure heater 5, a second stop valve 6, a first regulating valve 7, a deaerator 8, a third stop valve 9, a second regulating valve 10, a fourth stop valve 11, a first steam extraction pipeline 12, a second steam extraction pipeline 13, a third steam extraction pipeline 14, a condensate frequency modulation control unit 15, a subtracter 16, a first correction module 17, a second correction module 18 and a multiplier 19.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the auxiliary frequency modulation system and method based on the low-pressure heater water side flow splitting mode according to the present invention includes a condensate pump 1, a first low-pressure heater 3, a second low-pressure heater 4, a third low-pressure heater 5, a first regulating valve 7, a deaerator 8, a second regulating valve 10, and a condensate frequency modulation control unit 15;
condensate pump 1 is linked together with 7 entrances of first governing valve, and 7 female pipes in export of first governing valve divide two the tunnel: the first path is communicated with a water side inlet of a first low-pressure heater 3, a water side outlet of the first low-pressure heater 3 is communicated with a water side inlet of a second low-pressure heater 4, a water side outlet of the second low-pressure heater 4 is communicated with a water side inlet of a third low-pressure heater 5, a water side outlet of the third low-pressure heater 5 is communicated with an inlet of a deaerator 8, the second path is communicated with an inlet of a second regulating valve 10, and an outlet of the second regulating valve 10 is communicated with an inlet of the deaerator 8; the condensed water frequency modulation control unit 15 outputs an opening degree signal to be connected to the second regulating valve 10.
A first stop valve 2 is arranged between the outlet of the first regulating valve 1 and the first low-pressure heater 3.
A second stop valve 6 is arranged between the outlet of the third low-pressure heater 5 and the deaerator 8.
And a third stop valve 9 and a fourth stop valve 11 are arranged in front of and behind the second regulating valve 10, a third stop valve input pipeline is connected to a pipeline between the first regulating valve 7 and the first stop valve 2, and a fourth stop valve 11 output pipeline is connected to a pipeline between the second stop valve 6 and an inlet of the deaerator 8.
The steam turbine further comprises a first steam extraction pipeline 12 of the steam turbine, a second steam extraction pipeline 13 of the steam turbine and a third steam extraction pipeline 14 of the steam turbine, wherein the first steam extraction pipeline 12 of the steam turbine is communicated with a steam side inlet of the first low-pressure heater 3, the second steam extraction pipeline 13 of the steam turbine is communicated with a steam side inlet of the second low-pressure heater 4, and the third steam extraction pipeline 14 of the steam turbine is communicated with a steam side inlet of the third low-pressure heater 5.
The condensed water frequency modulation control unit 15 includes a subtracter 16, a first correction module 17, a second correction module 18, and a multiplier 19.
The rotating speed input signal and the rated rotating speed are connected with the input of the subtracter 16 and used for calculating the rotating speed deviation of the unit; the output of the subtracter 16 is connected with the input of the first correction block 17 and used for converting the theoretical opening value of the second regulating valve 10 according to the deviation of the rotating speed of the unit; the unit load input signal is connected with the input of the second correction module 18 and used for correcting the valve opening coefficient according to the unit load; the output of the first correction module 17 and the output of the second correction module 18 are respectively connected with the input of a multiplier 19 and used for calculating the actual opening instruction of the valve; the multiplier 19 outputs a valve opening command to be connected to the second regulator valve 10.
An auxiliary frequency modulation method based on a water side flow splitting mode of a low-pressure heater comprises the following steps:
when the unit normally operates with a load, the condensate pump 1 operates, condensate water sequentially passes through the first regulating valve 7, the first stop valve 2, the first low-pressure heater 3, the second low-pressure heater 4, the third low-pressure heater 5 and the second stop valve 6 to be fed to the deaerator, the low-pressure heater is pumped on the steam extraction side, the condensate water bypass third stop valve 9 and the fourth stop valve 10 are in an open state, and the condensate water bypass second regulating valve 10 receives an output instruction of the condensate water frequency modulation control unit 15;
when the rotation speed of the unit changes, the rotation speed input signal and the rated rotation speed are calculated through the subtracter 16 to obtain a rotation speed deviation signal, the rotation speed deviation signal is connected to the first correction module 17, and the first correction module 17 calculates the theoretical opening instruction of the second regulating valve 10 according to the rotation speed deviation; meanwhile, a unit load input signal is connected to the second correction module 18, and a valve correction coefficient is calculated through the second correction module 18 according to the actual load interval of the unit; the theoretical command signal of the second regulating valve and the valve correction coefficient are connected to the input of the multiplier 19, the opening signal of the second regulating valve 10 is obtained through calculation by the multiplier 19, and the opening of the second regulating valve 10 is rapidly changed. When the frequency of the power grid is reduced to exceed a primary frequency modulation dead zone, the second regulating valve 10 is quickly opened, and the flow of condensate water passing through the low-pressure heater is instantly reduced, so that the steam extraction quantity at the steam side of the low-pressure heater is reduced, the steam quantity of the work of the steam turbine is increased, the load is quickly increased, and the unit can quickly respond to the primary frequency modulation requirement.
In addition, during actual operation, the total condensate water flow is adjusted through the first adjusting valve 7, the condensate water flow entering the heater is adjusted through the second adjusting valve 10, the first adjusting valve 7 can be basically kept unchanged during primary frequency modulation action, the liquid level of the deaerator and the condensate pump outlet force are kept unchanged, and system disturbance is reduced.
In addition, the first shut-off valve 2 and the second shut-off valve 6 can be opened during the commissioning of the group and closed during the removal of the low-pressure heater.
In addition, the third stop valve 9 and the fourth stop valve 11 can be opened when the unit normally operates and closed when the second regulating valve 10 fails, and the function of on-line isolation and maintenance of the regulating valves is achieved.

Claims (8)

1.一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，包括凝结水泵(1)，凝结水泵(1)与第一调节阀(7)入口相连通，第一调节阀(7)出口母管分两路：第一路与第一低压加热器(3)水侧入口相连通、第一低压加热器(3)水侧出口与第二低压加热器(4)水侧入口相连通、第二低压加热器(4)水侧出口与第三低压加热器(5)水侧入口相连通、第三低压加热器(5)水侧出口与除氧器(8)入口相连通，第二路与第二调节阀(10)入口相连通，第二调节阀(10)出口与除氧器(8)入口相连通；1. An auxiliary frequency regulation system based on a low-pressure heater water-side split mode, characterized in that it comprises a condensate pump (1), the condensate pump (1) is communicated with the inlet of the first regulating valve (7), and the first regulating valve ( 7) The outlet main pipe is divided into two paths: the first path is connected with the water side inlet of the first low pressure heater (3), the water side outlet of the first low pressure heater (3) and the water side inlet of the second low pressure heater (4) The water side outlet of the second low pressure heater (4) is communicated with the water side inlet of the third low pressure heater (5), and the water side outlet of the third low pressure heater (5) is communicated with the inlet of the deaerator (8). , the second path is communicated with the inlet of the second regulating valve (10), and the outlet of the second regulating valve (10) is communicated with the inlet of the deaerator (8); 所述第二调节阀(10)与凝结水调频控制单元(15)输出开度信号相连接。The second regulating valve (10) is connected with the output opening signal of the condensate water frequency modulation control unit (15). 2.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述第一调节阀(7)出口与第一低压加热器(3)水侧入口之间设置有第一截止阀(2)。2. The auxiliary frequency modulation system based on the water-side split mode of the low-pressure heater according to claim 1, wherein the outlet of the first regulating valve (7) and the water-side inlet of the first low-pressure heater (3) A first shut-off valve (2) is arranged therebetween. 3.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述第三低压加热器(5)水侧出口与除氧器(8)入口之间设置有第二截止阀(6)。3. The auxiliary frequency modulation system based on the water-side split mode of the low-pressure heater according to claim 1, wherein the third low-pressure heater (5) is between the water-side outlet and the deaerator (8) inlet. A second shut-off valve (6) is arranged between them. 4.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述第二调节阀(10)前后设置有第三截止阀(9)和第四截止阀(11)，第三截止阀输入管道连接至第一调节阀(7)和第一截止阀(2)之间管道，第四截止阀(11)输出管道连接至第二截止阀(6)与除氧器(8)入口之间管道。4. An auxiliary frequency regulation system based on a water-side split mode of a low-pressure heater according to claim 1, wherein the second regulating valve (10) is provided with a third shut-off valve (9) and a fourth The cut-off valve (11), the input pipeline of the third cut-off valve is connected to the pipeline between the first regulating valve (7) and the first cut-off valve (2), and the output pipeline of the fourth cut-off valve (11) is connected to the second cut-off valve (6) ) and the inlet of the deaerator (8). 5.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述第一低压加热器(3)汽侧入口连通汽机第一抽汽管道(12)，所述第二低压加热器(4)汽侧入口连通汽机第二抽汽管道(13)，所述第三低压加热器(5)汽侧入口连通汽机第三抽汽管道(14)。5. The auxiliary frequency regulation system based on the water-side split mode of the low-pressure heater according to claim 1, wherein the steam-side inlet of the first low-pressure heater (3) is connected to the first steam extraction pipeline (12) of the steam turbine. ), the steam side inlet of the second low pressure heater (4) is connected to the second steam extraction pipeline (13) of the turbine, and the steam side inlet of the third low pressure heater (5) is connected to the third steam extraction pipeline (14) of the turbine. 6.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述凝结水调频控制单元(15)由DCS系统控制逻辑实现。6 . The auxiliary frequency regulation system based on the water-side split mode of the low-pressure heater according to claim 1 , wherein the condensate water frequency regulation control unit ( 15 ) is realized by a DCS system control logic. 7 . 7.根据权利要求1所述的一种基于低压加热器水侧分流方式的辅助调频系统，其特征在于，所述凝结水调频控制单元(15)包括减法器(16)、第一修正模块(17)、第二修正模块(18)、乘法器(19)；7. An auxiliary frequency regulation system based on a water-side split mode of a low-pressure heater according to claim 1, wherein the condensate water frequency regulation control unit (15) comprises a subtractor (16), a first correction module ( 17), a second correction module (18), a multiplier (19); 所述减法器(16)输入连接转速输入信号，转速输入信号用于计算机组转速偏差；减法器(16)输出与第一修正块(17)输入相连接，减法器(16)用于根据机组转速偏差折算第二调节阀(10)理论开度值；所述第二修正模块(18)输入连接机组负荷输入信号，机组负荷输入信号用于根据机组负荷修正阀门开度系数；所述第一修正模块(17)输出和第二修正模块(18)输出分别与乘法器(19)输入相连接，用于计算阀门实际开度指令，乘法器(19)输出阀门开度指令与第二调节阀(10)相连接。The input of the subtractor (16) is connected to the rotational speed input signal, and the rotational speed input signal is used to calculate the rotational speed deviation of the group; the output of the subtractor (16) is connected to the input of the first correction block (17), and the subtractor (16) is used to calculate the rotational speed deviation of the group. The rotational speed deviation is converted into the theoretical opening value of the second regulating valve (10); the second correction module (18) inputs the input signal of the unit load, and the unit load input signal is used to correct the valve opening coefficient according to the unit load; the first The output of the correction module (17) and the output of the second correction module (18) are respectively connected with the input of the multiplier (19) for calculating the actual valve opening command, and the multiplier (19) outputs the valve opening command and the second regulating valve (10) Connected. 8.基于权利要求1-7所述的一种基于低压加热器水侧分流方式的辅助调频系统的运行方法，其特征在于，包括以下步骤；8. The operation method of an auxiliary frequency regulation system based on a water-side split mode of a low-pressure heater according to claims 1-7, characterized in that, comprising the following steps; 机组带负荷运行过程中，凝结水泵(1)运行，凝结水依次经过第一调节阀(7)、第一截止阀(2)、第一低压加热器(3)、第二低压加热器(4)、第三低压加热器(5)、第二截止阀(6)上水至除氧器(8)，低压加热器抽汽侧抽汽投入，凝结水旁路第三截止阀(9)、第四截止阀(10)打开状态，凝结水旁路第二调节阀(10)接收凝结水调频控制单元(15)输出指令；During the operation of the unit under load, the condensate pump (1) runs, and the condensate passes through the first regulating valve (7), the first shut-off valve (2), the first low-pressure heater (3), and the second low-pressure heater (4) in sequence. ), the third low-pressure heater (5), the second cut-off valve (6) is fed to the deaerator (8), the steam extraction side of the low-pressure heater is put in, and the condensate bypasses the third cut-off valve (9), The fourth shut-off valve (10) is in an open state, and the condensate bypass second regulating valve (10) receives an output command from the condensate frequency modulation control unit (15); 当机组转速变化时，转速输入信号与额定转速通过减法器(16)计算得到转速偏差信号，转速偏差信号连接至第一修正模块(17)，第一修正模块(17)根据转速偏差计算第二调节阀(10)理论开度指令；同时机组负荷输入信号连接至第二修正模块(18)，根据机组实际负荷区间，通过第二修正模块(18)计算阀门修正系数；第二调节阀理论指令信号与阀门修正系数连接至乘法器(19)输入，通过乘法器(19)计算得到第二调节阀(10)开度信号，并快速改变第二调节阀(10)开度；当电网频率下降超过一次调频死区时，通过第二调节阀(10)快速开启，瞬间减少通过低压加热器的凝结水流量，从而低压加热器汽侧抽汽量减少，增量了汽轮机做功的蒸汽量实现快速增加负荷，使机组能够快速响应一次调频要求。When the rotational speed of the unit changes, the rotational speed input signal and the rated rotational speed are calculated by the subtractor (16) to obtain the rotational speed deviation signal, and the rotational speed deviation signal is connected to the first correction module (17), and the first correction module (17) calculates the second Theoretical opening degree command of the regulating valve (10); meanwhile, the unit load input signal is connected to the second correction module (18), and the valve correction coefficient is calculated by the second correction module (18) according to the actual load interval of the unit; the second regulating valve theoretical command The signal and the valve correction coefficient are connected to the input of the multiplier (19), and the opening signal of the second regulating valve (10) is obtained through the multiplier (19) calculation, and the opening of the second regulating valve (10) is rapidly changed; when the grid frequency drops When the dead zone of the primary frequency regulation is exceeded, the second regulating valve (10) is quickly opened to instantly reduce the flow of condensate water passing through the low-pressure heater, thereby reducing the steam extraction volume of the low-pressure heater, and increasing the steam volume of the turbine for work. Increase the load so that the unit can quickly respond to the primary frequency regulation request.
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