技术领域technical field
本发明涉及发电机组控制技术领域，尤其是一种火电机组宽负荷凝结水节流调频的方法。The invention relates to the technical field of generating set control, in particular to a method for throttling and frequency-regulating wide-load condensate water of thermal power generating sets.
背景技术Background technique
通常，为减少汽轮机调门节流损失，需将高调门维持在较大开度，但该运行方式下的调门向上增裕量小，导致机组一次调频加负荷能力弱，这将直接影响机组响应电网大幅缺额下的深度调频能力。Usually, in order to reduce the throttling loss of the steam turbine valve, it is necessary to maintain the high-speed valve at a large opening, but the upward margin of the valve under this operation mode is small, resulting in a weak capacity of the unit for primary frequency regulation and load, which will directly affect the response of the unit to the power grid. Deep FM capability under large deficit.
凝节水节流调频是一种有效的提升方案，其本质是利用汽轮机蓄热弥补锅炉蓄热调频能力的不足。凝结水节流主要有两种实现方式，一种是利用除氧器水位主阀门进行调节，另一种是利用凝泵变频器指令实现调节，目前工程应用中，会选择其中一种方案，但这会导致某一设备的执行机构频繁动作，加大设备的故障率，而且如果仅靠凝泵变频调节，在低负荷工况下，当凝泵变频器指令降低过多时，直接影响凝结水母管压力和凝结水用户的安全。Condensation-saving, flow-saving, frequency-regulating is an effective improvement scheme, and its essence is to use steam turbine heat storage to make up for the lack of boiler heat-storage and frequency-regulation capabilities. There are two main ways to achieve condensate throttling, one is to use the main valve of the water level of the deaerator to adjust, and the other is to use the command of the condensate pump frequency converter to achieve adjustment. At present, one of the solutions will be selected in engineering applications, but This will lead to frequent actions of the actuator of a certain equipment, increasing the failure rate of the equipment, and if only relying on the frequency conversion adjustment of the condensate pump, under low load conditions, when the command of the condensate pump frequency converter is reduced too much, it will directly affect the condensate jellyfish tube. Pressure and condensate user safety.
发明内容Contents of the invention
本发明要解决的技术问题是提供一种火电机组宽负荷凝结水节流调频的方法，能够解决现有技术的不足，实现机组在AGC宽负荷区间内全程实现凝结水节流变频调节。The technical problem to be solved by the present invention is to provide a method for wide-load condensate throttling and frequency regulation of thermal power units, which can solve the shortcomings of the prior art and realize condensate throttling and frequency conversion regulation of the unit throughout the AGC wide-load range.
为解决上述技术问题，本发明所采取的技术方案如下。In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.
一种火电机组宽负荷凝结水节流调频的方法，在高负荷段且凝泵变频指令未达到下限时，凝结水变频指令减少，凝结水流量降低，汽轮机回热系统抽汽量相应减少，机组负荷上升；当机组处于低负荷段或凝泵变频指令已达到下限时，将除氧器主阀开度减少，凝结水流量降低，汽轮机回热系统抽汽量减少，机组负荷上升，从而实现宽负荷段的凝结水节流一次调频功能。A wide-load condensate throttling and frequency regulation method for thermal power units. In the high-load section and the condensate pump frequency conversion command does not reach the lower limit, the condensate frequency conversion command is reduced, the condensate flow rate is reduced, and the steam extraction volume of the steam turbine reheating system is correspondingly reduced. The load rises; when the unit is in the low load section or the frequency conversion command of the condensate pump has reached the lower limit, the opening of the main valve of the deaerator is reduced, the condensate flow rate is reduced, the steam extraction of the steam turbine recovery system is reduced, and the load of the unit is increased, so as to realize wide Condensate throttling primary frequency regulation function in the load section.
作为优选，电网频率信号经第一映射函数得到的调频凝结水基准流量，机组功率经第二映射函数得到修正系数，将凝结水基准流量与修正系数经第一乘法器相乘得到调频凝结水量理论值；当凝结水调频激活信号触发时，第一切换器(8)输出值为凝结水理论流量，第一切换器输出值经第一速率限制器与除氧器水位凝泵PID模块输出值经第一减法器相减，即得到凝结水流量凝泵设定值；第一切换器输出值经第二速率限制器和第三映射函数的输出作为凝泵副调PID模块的前馈加快凝结水流量变化速度；当凝结水调频激活信号停止时，第一切换器输出值为第一模块值，第一模块值为0，凝泵调频不再起作用；除氧器水位凝泵PID模块的设定值为除氧器水位凝泵设定值，除氧器水位凝泵PID模块的反馈信号为除氧器实测值，除氧器水位凝泵PID模块的前馈信号为给水流量，除氧器水位凝泵PID模块的输出值为凝泵控制凝结水流量基准值；凝泵副调PID模块的设定值为凝结水流量凝泵设定值，反馈信号为凝结水流量经第一滤波模块的输出值，前馈信号为调频凝结水量理论值限速后的校正值，输出值为凝泵变频器控制指令。As a preference, the grid frequency signal is obtained by the first mapping function to obtain the frequency-modulated condensate reference flow, the unit power is obtained by the second mapping function to obtain the correction coefficient, and the condensate reference flow and the correction coefficient are multiplied by the first multiplier to obtain the frequency-modulated condensate volume theory value; when the condensate frequency modulation activation signal is triggered, the output value of the first switch (8) is the theoretical flow rate of condensate, and the output value of the first switch is passed through the first rate limiter and the output value of the deaerator water level condensate pump PID module. The first subtractor subtracts to obtain the set value of the condensate flow rate of the condensate pump; the output value of the first switcher passes through the second rate limiter and the output of the third mapping function as the feedforward of the PID module of the condensate pump sub-adjustment to speed up the condensate Flow change speed; when the activation signal of condensate frequency modulation stops, the output value of the first switcher is the value of the first module, the value of the first module is 0, and the frequency modulation of the condensate pump no longer works; the setting of the PID module of the deaerator water level condensate pump The value is the set value of the deaerator water level condensate pump, the feedback signal of the deaerator water level condensate pump PID module is the measured value of the deaerator, the feedforward signal of the deaerator water level condensate pump PID module is the feed water flow, and the deaerator water level The output value of the condensate pump PID module is the reference value of the condensate pump control condensate flow; the setting value of the condensate pump sub-adjustment PID module is the set value of the condensate flow condensate pump, and the feedback signal is the output of the condensate flow through the first filter module value, the feedforward signal is the correction value after the theoretical value of the condensed water volume is frequency-regulated and the speed is limited, and the output value is the control command of the condensate pump inverter.
作为优选，调频凝结水量理论值与调频凝结水量变化量记忆值经第二减法器相减得到所需凝结水流量变化量的剩余值；当凝结水调频激活信号和凝泵变频调频达下限信号同时触发时，第二切换器输出值为所需凝结水流量变化量的剩余值，第二切换器输出值经第三速率限制器与主阀主调PID模块输出值经第三减法器相减，即得到凝结水流量主阀设定值；第二切换器输出值经第四速率限制器和第四映射函数的输出作为主阀副调PID模块的前馈加快凝结水流量变化速度；当凝结水调频激活信号或凝泵变频调频达下限信号停止时，第二切换器输出值为第二模块值，第二模块值为0，主阀调频不再起作用；进一步，主阀主调PID模块的设定值为除氧器水位主阀设定值，反馈信号为除氧器水位信号，前馈信号为给水流量，输出值为主阀控制凝结水流量基准值；主阀副调PID模块的设定值为凝结水流量主阀设定值，反馈信号为凝结水流量经第二滤波模块的输出值，前馈信号为调频凝结水量理论值限速后的校正值，输出值为除氧器水位主调节阀指令。As a preference, the theoretical value of the frequency modulation condensate amount and the memory value of the frequency modulation condensate amount change are subtracted by the second subtractor to obtain the remaining value of the required condensate flow change; When triggered, the output value of the second switcher is the residual value of the required condensate flow variation, and the output value of the second switcher is subtracted by the third rate limiter and the output value of the main control PID module of the main valve through the third subtractor. That is, the set value of the condensate flow main valve is obtained; the output value of the second switcher is passed through the fourth rate limiter and the output of the fourth mapping function as the feedforward of the main valve sub-adjustment PID module to accelerate the change speed of the condensate flow; when the condensate When the frequency modulation activation signal or the condensate pump frequency conversion frequency modulation reaches the lower limit signal stops, the output value of the second switcher is the value of the second module, the value of the second module is 0, and the frequency modulation of the main valve will no longer work; further, the setting of the main valve and main modulation PID module The fixed value is the set value of the main valve of the water level of the deaerator, the feedback signal is the water level signal of the deaerator, the feedforward signal is the feed water flow, and the output value is the reference value of the condensate flow controlled by the main valve; The value is the setting value of the condensate flow main valve, the feedback signal is the output value of the condensate flow through the second filter module, the feed-forward signal is the correction value after frequency modulation of the theoretical value of the condensate flow, and the output value is the main value of the deaerator water level. Regulator valve command.
作为优选，凝结水调频投切开关的第一引脚、第二引脚分别送至第一RS触发器的置位端、复位端，用于记忆凝结水调频投切状态；电网频率信号送至低限报警模块，用于判断是否低频差一次调频动作；凝结水调频投切记忆状态信号、低频差一次调频动作信号与一次调频功能已投入信号作相与运算后，送至第二RS触发器的置位端，经第一脉冲模块输出作为凝结水调频激活的主条件I；当主条件I信号消失后，经过第一取非模块、第二脉冲模块并送至第二RS触发器的复位端，用于复位凝结水调频激活的主条件I；5号低加水位信号依次送至第一高低限报警模块、第二取非模块，用于判断5号低加水位是否处于正常状态；6号低加水位信号依次送至第二高低限报警模块、第三取非模块，用于判断6号低加水位是否处于正常状态；除氧器水位信号依次送至第三高低限报警模块、第四取非模块，用于判断除氧器水位是否处于正常状态；凝汽器水位信号依次送至第四高低限报警模块、第五取非模块，用于判断凝汽器水位是否处于正常状态；汽机高调门指令信号送至高限模块，通过检测通过汽轮机开调门向上增负荷的余量是否有限，用于判断汽机高调门是否过大；5号低加水位是否处于正常状态信号、6号低加水位是否处于正常状态信号、除氧器水位是否处于正常状态信号、凝汽器水位是否处于正常状态信号、汽机高调门是否过大信号共五个信号作相与运算作为凝结水调频激活的主条件II；凝结水调频激活的主条件I、主条件II作相与运算得到凝结水调频激活信号，用于判断凝结水调频是否处于激活状态。As a preference, the first pin and the second pin of the condensate water frequency modulation switching switch are respectively sent to the setting terminal and reset terminal of the first RS flip-flop for memorizing the condensate water frequency modulation switching state; the power grid frequency signal is sent to The low-limit alarm module is used to judge whether the low frequency difference primary frequency modulation action; the condensate water frequency modulation switching memory status signal, the low frequency difference primary frequency modulation action signal and the primary frequency modulation function input signal are phased and calculated, and then sent to the second RS trigger The setting terminal of the first pulse module is output as the main condition I for condensate frequency modulation activation; when the main condition I signal disappears, it is sent to the reset terminal of the second RS flip-flop through the first negation module and the second pulse module , which is used to reset the main condition I for condensate water frequency modulation activation; the No. 5 low water level signal is sent to the first high and low limit alarm module and the second negation module in turn to judge whether the No. 5 low water level is in a normal state; No. 6 The low water level signal is sent to the second high and low limit alarm module and the third negation module in order to judge whether the No. 6 low water level is in a normal state; the deaerator water level signal is sent to the third high and low limit alarm module and the fourth The non-taking module is used to judge whether the water level of the deaerator is in a normal state; the water level signal of the condenser is sent to the fourth high and low limit alarm module in turn, and the fifth non-taking module is used to judge whether the water level of the condenser is in a normal state; The command signal of the high-profile door is sent to the high-limit module, and it is used to judge whether the high-profile door of the turbine is too large by detecting whether the margin for increasing the load through the opening of the steam turbine door is limited; whether the low water level of No. Whether it is in a normal state signal, whether the water level of the deaerator is in a normal state signal, whether the condenser water level is in a normal state signal, and whether the high-profile door of the steam turbine is too large, a total of five signals are used as the main condition for the activation of condensate frequency modulation II ; Main condition I and main condition II for activation of condensate frequency modulation are phase-ANDed to obtain a condensate frequency modulation activation signal, which is used to determine whether the condensate frequency modulation is in an active state.
作为优选，低限报警模块的低限报警阈值为49.9Hz。Preferably, the low limit alarm threshold of the low limit alarm module is 49.9 Hz.
作为优选，凝泵变频器控制指令送至第一低限报警模块，用于判断凝泵变频器指令是否已达到低限；机组功率送至第二低限报警模块，用于判断机组是否已达到低限；凝泵变频器指令是否已达到低限信号、机组是否已达到低限信号经相或运算后得到凝结变频调频达低限信号；当凝结变频调频达低限信号触发时，表明凝泵变频器调频已经没有余量了，切换成主阀改变凝结水实现节流调频。Preferably, the control command of the condensate pump inverter is sent to the first lower limit alarm module for judging whether the command of the condensate pump inverter has reached the lower limit; the unit power is sent to the second lower limit alarm module for judging whether the unit has reached the lower limit. Low limit; whether the command of the condensate pump inverter has reached the low limit signal, whether the unit has reached the low limit signal, and the signal of whether the condensate frequency conversion and frequency modulation has reached the low limit is obtained after phase-OR operation; when the condensate frequency conversion and frequency modulation reaches the low limit signal is triggered, it indicates that There is no margin for the frequency modulation of the frequency converter, so switch to the main valve to change the condensed water to realize throttling and frequency modulation.
作为优选，当凝结水调频激活信号触发时，第三切换器输出记忆为该时刻的凝结水流量；当凝结水调频激活信号和凝泵变频调频达下限信号同时满足时，第四切换器输出记忆为当前时刻的凝结水流量；将第三切换器输出和第四切换器输出经第四减法器相减后得到调频凝结水量变化量记忆值。Preferably, when the condensate frequency modulation activation signal is triggered, the output of the third switcher is memorized as the condensate flow rate at that moment; is the condensed water flow rate at the current moment; the output of the third switcher and the output of the fourth switcher are subtracted by the fourth subtractor to obtain the memory value of the frequency modulation condensed water amount variation.
采用上述技术方案所带来的有益效果在于：本发明在高负荷段，主要利用改变凝泵变频器进行调频；当机组负荷过低或凝结水泵指令达到下限时，自动切换到主阀调节凝结水流量，从而实现机组在AGC宽负荷区间内全程实现凝结水节流变频调节。The beneficial effect of adopting the above-mentioned technical solution is that: in the high-load section, the present invention mainly uses the inverter to adjust the frequency of the condensate pump; when the unit load is too low or the condensate pump command reaches the lower limit, it will automatically switch to the main valve to adjust the condensate flow, so that the unit can realize condensate throttling and frequency conversion regulation in the whole process of AGC wide load range.
附图说明Description of drawings
图1是凝泵变频指令运算逻辑图。Figure 1 is the operation logic diagram of the frequency conversion instruction of the condensate pump.
图2是除氧器水位主阀指令运算逻辑图。Fig. 2 is a logic diagram of the instruction operation logic of the water level main valve of the deaerator.
图3是凝结水调频激活逻辑图。Figure 3 is a logic diagram for condensing water frequency modulation activation.
图4是凝泵变频调频达下限逻辑图。Fig. 4 is the logic diagram of frequency conversion and frequency modulation of the condensate pump reaching the lower limit.
图5是调频凝结水变化量记忆值逻辑图。Figure 5 is a logic diagram of the memory value of frequency modulation condensate change.
具体实施方式Detailed ways
参照图1-5，本发明的实施例用上海汽轮机有限公司生产的N1000-26.25/600/600(TC4F)型、超超临界、一次中间再热、单轴、四缸四排汽、凝汽式汽轮机组。With reference to Fig. 1-5, the embodiment of the present invention uses the N1000-26.25/600/600 (TC4F) type produced by Shanghai Steam Turbine Co., Ltd., ultra-supercritical, one intermediate reheating, single shaft, four-cylinder four-exhaust steam, condensed steam steam turbine unit.
一种火电机组宽负荷凝结水节流调频的方法，其特征在于：在高负荷段且凝泵变频指令未达到下限时，凝结水变频指令减少，凝结水流量降低，汽轮机回热系统抽汽量相应减少，机组负荷上升；当机组处于低负荷段或凝泵变频指令已达到下限时，将除氧器主阀开度减少，凝结水流量降低，汽轮机回热系统抽汽量减少，机组负荷上升，从而实现宽负荷段的凝结水节流一次调频功能。A wide-load condensate throttling and frequency-regulating method for thermal power units, characterized in that: in the high-load section and the condensate pump frequency conversion command does not reach the lower limit, the condensate frequency conversion command is reduced, the condensate flow rate is reduced, and the steam extraction volume of the steam turbine reheating system is reduced. When the unit is in the low load section or the frequency conversion command of the condensate pump has reached the lower limit, the opening of the main valve of the deaerator is reduced, the condensate flow rate is reduced, the steam extraction of the steam turbine recovery system is reduced, and the load of the unit is increased. , so as to realize the primary frequency regulation function of condensate water throttling in wide load section.
电网频率信号1经第一映射函数2得到的调频凝结水基准流量，机组功率3经第二映射函数4得到修正系数，将凝结水基准流量与修正系数经第一乘法器5相乘得到调频凝结水量理论值6；当凝结水调频激活7信号触发时，第一切换器8输出值为凝结水理论流量6，第一切换器8输出值经第一速率限制器10与除氧器水位凝泵PID模块17输出值经第一减法器12相减，即得到凝结水流量凝泵设定值；第一切换器8输出值经第二速率限制器11和第三映射函数13的输出作为凝泵副调PID模块20的前馈加快凝结水流量变化速度；当凝结水调频激活信号7停止时，第一切换器8输出值为第一模块9值，第一模块9值为0，凝泵调频不再起作用；除氧器水位凝泵PID模块17的设定值为除氧器水位凝泵设定值14，除氧器水位凝泵PID模块17的反馈信号为除氧器实测值15，除氧器水位凝泵PID模块17的前馈信号为给水流量16，除氧器水位凝泵PID模块17的输出值为凝泵控制凝结水流量基准值；凝泵副调PID模块20的设定值为凝结水流量凝泵设定值，反馈信号为凝结水流量18经第一滤波模块19的输出值，前馈信号为调频凝结水量理论值限速后的校正值，输出值为凝泵变频器控制指令21。The grid frequency signal 1 is obtained through the first mapping function 2 to obtain the frequency modulation condensate reference flow, and the unit power 3 is obtained through the second mapping function 4 to obtain the correction coefficient, and the condensate reference flow and the correction coefficient are multiplied by the first multiplier 5 to obtain the frequency modulation condensation The theoretical value of water volume is 6; when the condensate frequency modulation activation 7 signal is triggered, the output value of the first switcher 8 is the theoretical flow rate of condensate water 6, and the output value of the first switcher 8 passes through the first rate limiter 10 and the deaerator water level condensate pump The output value of the PID module 17 is subtracted by the first subtractor 12 to obtain the set value of the condensate flow condensate pump; the output value of the first switcher 8 is output by the second rate limiter 11 and the third mapping function 13 as the condensate pump The feed-forward of the sub-adjustment PID module 20 accelerates the change speed of the condensate flow; when the condensate frequency modulation activation signal 7 stops, the output value of the first switcher 8 is the value of the first module 9, the value of the first module 9 is 0, and the frequency of the condensate pump is adjusted No longer works; the set value of the deaerator water level condensate pump PID module 17 is set value of the deaerator water level condensate pump set value 14, the feedback signal of the deaerator water level condensate pump PID module 17 is the deaerator measured value 15, except The feed-forward signal of the oxygenator water level condensate pump PID module 17 is the feed water flow rate 16, the output value of the deaerator water level condensate pump PID module 17 is the reference value of the condensate pump control condensate flow rate; the set value of the condensate pump auxiliary adjustment PID module 20 is the set value of the condensate flow rate of the condensate pump, the feedback signal is the output value of the condensate flow rate 18 through the first filter module 19, the feed-forward signal is the correction value after frequency modulation of the theoretical value of the condensate amount and the speed limit, and the output value is the inverter of the condensate pump Control instruction 21.
调频凝结水量理论值6与调频凝结水量变化量记忆值22经第二减法器23相减得到所需凝结水流量变化量的剩余值；当凝结水调频激活信号7和凝泵变频调频达下限信号24同时触发时，第二切换器25输出值为所需凝结水流量变化量的剩余值，第二切换器25输出值经第三速率限制器27与主阀主调PID模块32输出值经第三减法器29相减，即得到凝结水流量主阀设定值；第二切换器25输出值经第四速率限制器28和第四映射函数30的输出作为主阀副调PID模块34的前馈加快凝结水流量变化速度；当凝结水调频激活信号(7)或凝泵变频调频达下限信号24停止时，第二切换器25输出值为第二模块26值，第二模块26值为0，主阀调频不再起作用；进一步，主阀主调PID模块32的设定值为除氧器水位主阀设定值31，反馈信号为除氧器水位信号15，前馈信号为给水流量16，输出值为主阀控制凝结水流量基准值；主阀副调PID模块34的设定值为凝结水流量主阀设定值，反馈信号为凝结水流量18经第二滤波模块33的输出值，前馈信号为调频凝结水量理论值限速后的校正值，输出值为除氧器水位主调节阀指令35。The theoretical value 6 of frequency-modulated condensate volume and the memory value 22 of frequency-modulated condensate volume change are subtracted by the second subtractor 23 to obtain the remaining value of the required condensate flow volume change; 24 are triggered at the same time, the output value of the second switcher 25 is the residual value of the required condensate flow variation, and the output value of the second switcher 25 is passed through the third rate limiter 27 and the output value of the main valve main adjustment PID module 32 through the first The three subtractors 29 subtract each other to obtain the set value of the condensate flow main valve; the output value of the second switcher 25 passes through the output of the fourth rate limiter 28 and the fourth mapping function 30 as the front of the main valve auxiliary adjustment PID module 34 Feedback speeds up the changing speed of the condensed water flow; when the condensed water frequency modulation activation signal (7) or the condensate pump frequency conversion frequency modulation reaches the lower limit signal 24 stops, the output value of the second switcher 25 is the value of the second module 26, and the value of the second module 26 is 0 , the frequency modulation of the main valve no longer works; further, the setting value of the main valve main tuning PID module 32 is the setting value of the main valve of the deaerator water level 31, the feedback signal is the water level signal of the deaerator 15, and the feedforward signal is the water flow rate 16 , the output value is the main valve control condensate flow reference value; the set value of the main valve auxiliary regulator PID module 34 is the set value of the condensate flow main valve, and the feedback signal is the output value of the condensate flow 18 through the second filter module 33 , the feed-forward signal is the correction value after the theoretical value of the condensed water volume is frequency-regulated and the speed is limited, and the output value is the command 35 for the main regulating valve of the water level of the deaerator.
凝结水调频投切开关36的第一引脚PK1、第二引脚PK2分别送至第一RS触发器37的置位端、复位端，用于记忆凝结水调频投切状态；电网频率信号1送至低限报警模块39，用于判断是否低频差一次调频动作；凝结水调频投切记忆状态信号、低频差一次调频动作信号与一次调频功能已投入信号38作相与运算后，送至第二RS触发器40的置位端，经第一脉冲模块41输出作为凝结水调频激活的主条件I；当主条件I信号消失后，经过第一取非模块42、第二脉冲模块43并送至第二RS触发器40的复位端，用于复位凝结水调频激活的主条件I；5号低加水位信号44依次送至第一高低限报警模块45、第二取非模块46，用于判断5号低加水位是否处于正常状态；6号低加水位信号47依次送至第二高低限报警模块48、第三取非模块49，用于判断6号低加水位是否处于正常状态；除氧器水位信号15依次送至第三高低限报警模块50、第四取非模块51，用于判断除氧器水位是否处于正常状态；凝汽器水位信号52依次送至第四高低限报警模块53、第五取非模块54，用于判断凝汽器水位是否处于正常状态；汽机高调门指令信号55送至高限模块56，通过检测通过汽轮机开调门向上增负荷的余量是否有限，用于判断汽机高调门是否过大；5号低加水位是否处于正常状态信号、6号低加水位是否处于正常状态信号、除氧器水位是否处于正常状态信号、凝汽器水位是否处于正常状态信号、汽机高调门是否过大信号共五个信号作相与运算作为凝结水调频激活的主条件II；凝结水调频激活的主条件I、主条件II作相与运算得到凝结水调频激活信号7，用于判断凝结水调频是否处于激活状态。The first pin PK1 and the second pin PK2 of the condensate water frequency modulation switching switch 36 are respectively sent to the setting terminal and the reset terminal of the first RS flip-flop 37 for memorizing the condensate water frequency modulation switching state; the grid frequency signal 1 sent to the lower limit alarm module 39 for judging whether the low-frequency difference primary frequency modulation action; the condensed water frequency modulation switching memory status signal, the low-frequency difference primary frequency modulation action signal and the primary frequency modulation function input signal 38 are phased and calculated, and then sent to the first The setting end of the two RS flip-flops 40 is output through the first pulse module 41 as the main condition I for condensed water frequency modulation activation; when the main condition I signal disappears, it passes through the first negation module 42 and the second pulse module 43 and sends it to The reset terminal of the second RS flip-flop 40 is used to reset the main condition I of condensed water frequency modulation activation; No. 5 low water level signal 44 is sent to the first high and low limit alarm module 45 and the second negation module 46 successively for judging Whether the No. 5 low water level is in a normal state; the No. 6 low water level signal 47 is sent to the second high and low limit alarm module 48 and the third negation module 49 in order to judge whether the No. 6 low water level is in a normal state; The water level signal 15 of the condenser is sent to the third high and low limit alarm module 50 and the fourth negation module 51 successively, for judging whether the water level of the deaerator is in a normal state; the condenser water level signal 52 is sent to the fourth high and low limit alarm module 53 successively , The fifth negation module 54 is used to judge whether the water level of the condenser is in a normal state; the steam turbine high-adjustment door command signal 55 is sent to the high-limit module 56, and whether the margin of increasing load upwards through the steam turbine opening adjustment door is limited by detection is used for judging Whether the high-profile door of the steam turbine is too large; whether the No. 5 low-fill water level is in a normal state signal, whether the No. 6 low-fill water level is in a normal state signal, whether the deaerator water level is in a normal state signal, whether the condenser water level is in a normal state signal, steam turbine Whether the high-profile door is too large or not, a total of five signals are used as the main condition II for condensate frequency modulation activation; the main condition I and main condition II for condensate water frequency modulation activation are phased and calculated to obtain the condensate frequency modulation activation signal 7, which is used for Determine whether the condensate frequency modulation is activated.
低限报警模块39的低限报警阈值为49.9Hz。The low limit alarm threshold of the low limit alarm module 39 is 49.9 Hz.
凝泵变频器控制指令21送至第一低限报警模块57，用于判断凝泵变频器指令是否已达到低限；机组功率3送至第二低限报警模块58，用于判断机组是否已达到低限；凝泵变频器指令是否已达到低限信号、机组是否已达到低限信号经相或运算后得到凝结变频调频达低限信号；当凝结变频调频达低限信号触发时，表明凝泵变频器调频已经没有余量了，切换成主阀改变凝结水实现节流调频。The condensate pump inverter control command 21 is sent to the first lower limit alarm module 57 for judging whether the condensate pump inverter command has reached the lower limit; the unit power 3 is sent to the second lower limit alarm module 58 for judging whether the unit has reached the lower limit; Reach the lower limit; the signal of whether the inverter command of the condensate pump has reached the lower limit and whether the unit has reached the lower limit signal is obtained after the phase-OR operation; There is no margin for frequency modulation of the pump inverter, so switch to the main valve to change the condensed water to achieve throttling and frequency modulation.
当凝结水调频激活信号7触发时，第三切换器61输出记忆为该时刻的凝结水流量59；当凝结水调频激活信号7和凝泵变频调频达下限信号24同时满足时，第四切换器60输出记忆为当前时刻的凝结水流量59；将第三切换器61输出和第四切换器60输出经第四减法器62相减后得到调频凝结水量变化量记忆值22。When the condensate frequency modulation activation signal 7 is triggered, the third switch 61 outputs the condensate flow rate 59 stored as the moment; The output of 60 is stored as the condensate flow 59 at the current moment; the output of the third switch 61 and the output of the fourth switch 60 are subtracted by the fourth subtractor 62 to obtain the memory value 22 of frequency modulation condensate change.
上述描述仅作为本发明可实施的技术方案提出，不作为对其技术方案本身的单一限制条件。The above description is only proposed as an implementable technical solution of the present invention, and not as a single restriction on the technical solution itself.
| Application Number | Priority Date | Filing Date | Title |
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| CN201711084262.0ACN107905852B (en) | 2017-11-02 | 2017-11-02 | A method for wide-load condensate throttling and frequency regulation of thermal power units |
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| CN201711084262.0ACN107905852B (en) | 2017-11-02 | 2017-11-02 | A method for wide-load condensate throttling and frequency regulation of thermal power units |
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| CN107905852Atrue CN107905852A (en) | 2018-04-13 |
| CN107905852B CN107905852B (en) | 2021-06-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711084262.0AActiveCN107905852B (en) | 2017-11-02 | 2017-11-02 | A method for wide-load condensate throttling and frequency regulation of thermal power units |
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| CN (1) | CN107905852B (en) |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information | Address after:230601 Ziyun Road 299, Hefei Economic and Technological Development Zone, Anhui Province Applicant after:Power Science Research Institute of Anhui Electric Power Co., Ltd. Applicant after:State Grid Corporation of China Applicant after:Anhui Electric Power Co., Ltd. Address before:230601 Ziyun Road 299, Hefei Economic Development Zone, Anhui Province Applicant before:Electric Power Research Institute of State Grid Anhui Electric Power Company Applicant before:State Grid Corporation of China Applicant before:State Grid Anhui Electric Power Company | |
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