CN107246390A - Control method for multi-stage pressure of large helium compressor station - Google Patents

Control method for multi-stage pressure of large helium compressor station Download PDF

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CN107246390A
CN107246390A CN 201710377672 CN201710377672A CN107246390A CN 107246390 A CN107246390 A CN 107246390A CN 201710377672 CN201710377672 CN 201710377672 CN 201710377672 A CN201710377672 A CN 201710377672A CN 107246390 A CN107246390 A CN 107246390A
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pressure
control
valve
lp
bypass valve
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CN 201710377672
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Chinese (zh)
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胡良兵
庄明
余强
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中国科学院合肥物质科学研究院
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C28/26Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00Fluid
    • F04C2210/10Fluid working
    • F04C2210/105Helium (He)

Abstract

The invention discloses a control method for multi-stage pressure of a large helium compressor station. Stabilization for three-stage pressure is taken as a core control target, and with regard to a structure of forming three-stage pressure through two-stage serial connection for main compressor units, a channel is formed between each two pressure pipelines and a bypass valve is arranged in a matching manner for realizing rapid allocation for a helium gas amount in the three-stage pressure, so that the defects of low response speed and high overshoot possibility due to long-time delay of adjustment carried out through only using a compressor energy slide valve are overcome; and control valves are arranged among a gas storage sub-system, a recovery sub-system and a main compressor unit sub-system of the compressor station for realizing allocation for helium gas amount between a three-stage pressure pipeline of a main compressor system and an external sub-system so as to suppress pressure fluctuation caused by unbalance of the gas amount in the system. Coordinated control methods for respective multiple single-variable execution mechanisms for the three-stage pressure are designed separately through decomposing a coupling relationship between each two stages of pressure, and real-time adjustment for the multi-stage pressure of the large helium compressor station is realized in combination with many expert rules and dynamic matching for control parameters.

Description

一种大型氦压缩机站多级压力的控制方法 The method of controlling a large multistage pressure helium compressors station

技术领域 FIELD

[0001] 本发明涉及压缩机站自动控制方法领域,具体是一种大型氨压缩机站多级压力的控制方法。 [0001] The present invention relates to the field of automatic control method for a compressor station, in particular a method for controlling the pressure of a large, multistage compressor stations ammonia.

背景技术 Background technique

[0002] 氦制冷循环过程中所需的高压氦气是由压缩机压缩实现的,压缩机是制冷机系统重要的动力设备。 [0002] The high pressure helium gas required helium refrigeration cycle is compressed by the compressor to achieve, it is important to power plant compressor chiller system. 大型氦制冷机制冷量大、流程复杂,通常需要配备多级不同流量和压比的大型压缩机系统,压缩机系统又可划分为储气、回收、主压缩机组三个子系统。 Helium refrigerator cooling capacity large, complex process, usually with different flow rates and large multi-stage compressor system pressure ratio, compressor system can be divided into gas recovery, the main compressor three subsystems. 储气系统由多个中压筒构成,储气压力介于低压和中压之间;回收系统由悬浮式气柜和回收压缩机构成;主压缩机一般由多台大型螺杆压缩机串并联组成,能量滑阀是螺杆压缩机常用的能量调节装置,可以实现排气量的无极调节。 The system consists of a plurality of gas pressure in the barrel, gas pressure is between low and medium voltage; floating recovery system consists of a compressor and recycle gas tank; primary compressor units generally consist of multiple series-parallel large screw compressors composition energy screw compressor slide valve is commonly used in the energy adjusting device, stepless adjustment of the displacement can be achieved. 稳态运行时,压缩机站为制冷机提供合适排气量, 同时需要保证各级压力稳定在系统所要求的给定值附近,且能够应对负载波动和突发干扰自动调整运行状态,控制效果直接影响制冷机系统的运行效率与安全。 Steady-state operation, the refrigerator compressor stations to provide appropriate displacement, while the need to ensure stable pressure setpoint levels required in the system in the vicinity, and can respond to load fluctuations and automatically adjust the operating state of burst interference, control effect directly affect the efficiency and safety of the chiller system. 目前现有技术中过度依赖压缩机能量滑阀控制,然而能量滑阀难以精确定位,具有不确定性漂移和非线性,串并联结构相对于单极结构存在中压传递延迟环节,因此造成调节长时间滞后且容易引起超调。 Currently the prior art compressor is excessive dependence on energy control slide valve, however, difficult to pinpoint the energy slide valve, having a nonlinear and drift uncertainty, series-parallel configuration with respect to the presence of voltage monopolar configuration link propagation delay, thus causing adjustment length time lag and prone to overshoot. 对于多变量耦合,多工况频繁转换的复杂压缩机站系统,简单的控制规则难以取得好的控制效果,从而造成压力波动较大和系统震荡。 For multivariable coupling conditions plurality complex compressor stations frequent switching system, a simple control law is difficult to obtain good control effect, causing pressure fluctuations and system oscillation.

[0003] [0003]

发明内容本发明的目的是提供一种大型氦压缩机站多级压力的控制方法,能够根据负载变化调节运行状态,具有一定的抗干扰能力,抑制系统震荡,实现压缩机站各级压力的自动控制。 SUMMARY OF THE INVENTION The present invention is to provide a large, multistage pressure helium compressors station control method, the load variation can be adjusted according to the operating state, has a certain anti-interference ability, shock suppression system, to achieve the pressure levels in the compressor station automatically control.

[0004] 为了达到上述目的,本发明所采用的技术方案为: 一种大型氦压缩机站多级压力的控制方法,其特征在于:以稳定三级压力为核心控制目标,针对主压缩机组两级串联形成三级压力的结构,在两两压力管路之间设置通路并配以旁通阀实现三级压力内部氦气量的快速调配,以改善单一使用压缩机能量滑阀调节的长时间滞后造成响应速度慢、易超调的缺点;在压缩机站储气、回收、主压缩机组三个子系统之间布置控制阀门,实现主压缩机系统三级压力管路与外部子系统之间的氦气量调配,通过分解各级压力之间的耦合关系,分别设计了三级压力各自的单变量多个执行机构的协调控制策略,其中: 三级压力中低压压力LP控制回路的执行机构是与高压管路相连的旁通阀V1、V2,与回收系统相连的保护阀V3以及低压级螺杆压缩机组C1能量滑阀,其中旁通阀V1 [0004] To achieve the above object, the technical solution employed in the present invention are: a control method of a large-scale multistage pressure helium compressors station, wherein: the core to stabilize the three control target pressure, for two main compressor three pressure stages connected in series forming structure is provided between each two passages and with a bypass pressure line valve to achieve three amount of helium pressure inside the rapid deployment of a single compressor is used to improve the energy time lag adjusting slide valve resulting in slow response, overshoot is easily disadvantage; gas compressor station, recovery, control valves disposed between the main compressor three subsystems to achieve the helium compressor system between the main pressure line and three external subsystem formulations gas by decomposing the coupling between the pressure levels, three were designed pressure of each of the plurality of actuators univariate coordinate control strategies, wherein: three LP pressure in the low pressure loop control of the actuator is a high pressure a bypass conduit connected to the valve V1, V2, V3 and recovery protection valve connected to the system and the low-pressure stage screw compressor spool C1 of energy, wherein the bypass valve V1 、V2、保护阀V3 均由PID控制器控制; 低压压力LP控制策略是以低压压力LP作为单一被控变量:低压压力LP>设定值LP_SP1 时,控制旁通阀VI开度减小,其中LP_SP1为;当旁通阀VI开度低于下限值时,低压级螺杆压缩机组C1能量滑阀执行增载动作;当低压LP〈设定值LP_SP1时,控制旁通阀VI开度增大,当旁通阀VI开度高于上限值时,低压级螺杆压缩机组C1减载;如果低压压力LP继续下降至低压压力LP〈设定值LP_SP2,则控制旁通阀V2打开辅助调节;当低压压力LP>上限值LP_HI时, 控制保护阀V3打开向回收系统泄压; 三级压力中中压压力MP控制回路的执行机构是与高压管路相连的旁通阀V4,与低压管路相连的旁通阀V5,与高压级螺杆压缩机组C2入口相连的旁通阀V6,其中旁通阀V4、V5、V6 均由PID控制器控制; 中压压力MP控制策略是以中压压力MP作为单一被控变量,由旁通阀V4与旁通阀V6 , V2, V3 protection valve by PID controller; low pressure in the low pressure LP LP control strategy is controlled as a single variable: the low pressure LP> set value LP_SP1, VI controls the bypass valve opening degree is reduced, wherein is LP_SP1; VI when the bypass valve opening degree is less than the lower limit, the low-pressure stage screw compressor spool C1 energy carrier by performing the operation; when the low pressure LP <LP_SP1 set value, the bypass control valve opening degree is increased VI when the opening degree of the bypass valve VI than the upper limit, the low-pressure stage screw compressor C1 shedding; if the low pressure continues to drop to a low pressure LP LP <setpoint LP_SP2, the bypass control valve V2 is opened auxiliary regulator; when the upper limit value LP_HI low pressure LP>, control protection relief valve V3 is opened to the collection system; MP three intermediate pressure in the pressure loop control of the actuator bypass valve V4 is connected to the high-pressure pipe, the low-pressure pipe a bypass passage connected to the valve V5, V6 and bypass valve inlet screw compressor C2 is connected to the high pressure stage, wherein the bypass valve V4, V5, V6 PID control by the controller; MP intermediate pressure is the intermediate pressure control strategy MP as a single controlled variable by the bypass valve and the bypass valve V4 V6 行逆向分程控制,旁通阀V4的PID控制器反作用,旁通阀V6的PID控制器正作用,且旁通阀V4与旁通阀V6互锁,只有当其中一个关闭后,才控制另一个进行调节;当MP>上限值MP_HI,控制旁通阀V5打开向低压压力LP管路泄压; 三级压力中高压压力HP控制回路的执行机构是与储气系统相连的收气阀V7、V8,与低压管路相连的旁通阀V2,其中收气阀V7、V8均由PID控制器控制; 高压压力HP的控制策略是:当高压压力HPHP>设定值HP_SP1,控制收气阀V7打开向储气系统收气,当收气阀V7来不及收气,高压压力HP继续升高至高压压力HP>设定值HP_SP2,启动收气阀V8控制;当高压压力HP>上限值HP_HI时,则强制旁通阀V2打开向低压路泄压。 Reverse line split range control, PID controller bypass valve V4 reaction, the positive effect of the bypass valve V6 PID controller bypass valve and bypass valve V6 and V4 interlocking, wherein only when a closed before the other control a regulated; when MP> upper limit MP_HI, the bypass control valve V5 is opened to the low pressure relief line LP; HP three pressure in the high pressure loop control of the actuator is closed and valve V7 is connected to the gas storage system , V8, V2 and the bypass valve is connected to low-pressure line, wherein the closing valves V7, V8 by the PID controller; HP high pressure control strategy is: when the high-pressure HPHP> setpoint HP_SP1, close control valve V7 is opened to the gas getter system, when the gas close valve V7 received too late, the high pressure HP continues to rise to a high pressure HP> setpoint HP_SP2, starts to close the control valve V8; when the pressure on the high pressure HP> limit HP_HI when, the forced bypass valve V2 are opened to the low pressure relief passage.

[0005] 所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:低压压力LP控制策略中,设定值LP_SP1为旁通阀VI的PID控制器的设定值,且旁通阀VI的PID控制器是动态PID控制器,其参数根据系统工况动态调整; 设定值LP_SP2为旁通阀V2的PID控制器的设定值,且旁通阀V2的PID控制器是带有专家规则的PID控制器; 上限值LP_HI为保护阀V3的PID控制器的设定值。 The control method of the multistage pressure [0005] A large helium compressor stations, wherein: the low pressure LP control strategy, the set value for the setting value LP_SP1 bypass valve VI PID controller, and bypass valve VI is a dynamic PID controller PID controller, its parameters dynamically adjusted based on system conditions; LP_SP2 set value to the set value of the bypass valve V2 PID controller, and the bypass valve V2 PID controller is a PID controller with expert rules; upper limit of the PID controller LP_HI protection valve V3 set value.

[0006] 所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:中压压力MP控制策略中,上限值MP_HI为旁通阀V5的PID控制器中设定值。 The control method of the multistage pressure [0006] A large helium compressor stations, wherein: the intermediate pressure MP in the control strategy, the upper limit set value MP_HI bypass valve V5 is a PID controller.

[0007] 所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:高压压力HP的控制策略中,设定值HP_SP1为收气阀V7的PID控制器中设定值,设定值HP_SP2为收气阀V8的PID控制器中设定值,上限值HP_HI为旁通阀V2的PID控制器的极限设定值。 A large, helium compressors station control method according to [0007] of the multistage pressure, characterized in that: the high pressure HP in the control strategy, the set value is close valve V7 HP_SP1 PID controller set value, setting the limit value is set to a value close valve V8 HP_SP2 PID controller set value, the upper limit of the bypass valve V2 HP_HI PID controller.

[0008] 所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:当负载吸气量大于回气量,造成压缩机站系统氦气量减小使得中压压力肥和高压压力HP下降,当中压压力MP〈补气值MP_S且高压压力HP〈补气值即_3时,判断系统进入补气状态,打开与储气系统相连的补气阀V9由低压管路向系统补气; 补气控制的专家规则是:当满足补气条件时,通过设置补气阀V9的PID控制器设定值为LP_SP_S抬升低压压力LP进行补气,低压压力LP升高使得低压级压缩机机组排气量增大导致中压压力MP升高,中压压力MP升高又使得高压级压缩机机组排气量增大导致高压压力HP 升高;当补气条件不满足时,其设定补气阀V9的PID控制器降为LP_SP_D,以此控制补气阀V9 迅速关闭结束补气,其中补气阀V9的PID控制器设定值据负载变化动态给定,当负载吸气速度增大时,通过增大补气阀V9的 A method of controlling multistage pressure [0008] A large of the helium compressor stations, wherein: when the load back to the intake air amount, resulting in reducing the amount of helium gas compressor station system so that the intermediate pressure and high pressure fertilizer HP reduced pressure intermediate pressure MP <qi and the high pressure value HP MP_S <_3 i.e. when the value of qi, qi enters the system determination state, V9 is opened and the gas fill valve system connected to the system by the low-pressure line qi ; qi control expert rules are: when the condition is satisfied qi, fill valve V9 is provided by the PID controller is set to the low pressure LP for lifting LP_SP_S qi, such that the low pressure LP increase low-pressure stage compressor unit increase in displacement results in the intermediate pressure MP rises, the intermediate pressure MP rises so that the high-pressure stage compressor unit and displacement lead to increased high pressure HP increased; qi when the condition is not satisfied, it is set up PID controller valve V9 reduced LP_SP_D, thereby controlling the fill valve V9 qi rapid closure end, wherein the PID controller set point valve V9 complement the data given dynamic load change, the intake velocity is increased when the load when, by increasing the fill valve V9 PID控制器设定值LP_SP_S相应的提升补气速度。 PID controller setpoint LP_SP_S qi corresponding increase speed.

[0009] 所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:控制系统由PLC系统或DCS控制架构实现,现场设备层由测量仪表与执行机构组成,通过I/O卡件与控制层相连,控制层为PLC或DCS的控制卡件;PLC或DCS上位机系统通过控制网络与控制层通信,实现监控信号获取与控制组态下载。 A method of controlling multistage pressure [0009] A large of the helium compressor stations, wherein: the control system control architecture implemented by the PLC or DCS system, the field device level by a composition measuring instruments and actuators, through I / O cards connected to the control layer, the control layer to control a PLC or DCS card member; PLC or DCS control system through the PC communicating with the network control layer, and to achieve control signal obtaining download control configuration.

[0010]本发明的优点是:提供了一种大型氦压缩机站多级压力的控制方法,通过分解耦合关系把多变量控制转换为单一变量控制,针对每一控制变量设计了多执行机构协调控制策略与专家规则,并根据运行状态动态调整控制器参数,克服了简单的控制规则调节大滞后,易超调的缺点,并能够智能应对系统的变工况运行。 [0010] The advantage of the present invention are: to provide a control method of a large, multistage pressure helium compressors stations, a single variable controlled by the decomposition of the coupling relationship is converted into multivariable control, the control variables for each of the multiple actuators designed to coordinate control strategies and expert rules, and dynamically adjusts the controller parameters according to the operating state, to overcome the simple control rules regulating large delay, variable conditions drawback is easy to overshoot, and intelligently respond to system operation.

附图说明 BRIEF DESCRIPTION

[0011]图1为本发明方法实施例一种大型氦螺杆压缩机站流程图。 Large embodiment of a screw compressor stations flowchart helium [0011] Figure 1 is a method of the invention.

[0012]图2为本发明方法中LP的控制框图。 [0012] FIG 2 is a control block diagram of the method of the invention LP.

[0013]图3为本发明方法中MP的控制框图。 [0013] FIG. 3 is a control block diagram of the method of the present invention MP.

[00M]图4为本发明方法中HP的控制框图。 [00M] FIG. 4 is a control block diagram of the method of the invention HP.

[0015]图5为本发明方法中补气控制原理图。 Method [0015] FIG. 5 of the present invention, control schematic qi.

具体实施方式 detailed description

[0016]如图1所示,一种大型氦压缩机站多级压力的控制方法,针对主压缩机组两级串联形成三级压力的结构,在两两压力管路之间设置通路并配以旁通阀,在压缩机站储气、回收、主压缩机组三个子系统之间布置保护阀与收、补气阀,通过对这些控制阀门与压缩机能量滑阀的控制实现各级压力的调节与系统气量的平衡,达到控制压力稳定的目标。 [0016] 1, the control method for a large multi-stage pressure helium compressor stations for two series to form the main compressor structure three pressure passage is provided between each two of the pressure conduit and with a bypass valve in the gas compressor stations, recovery, protection valve disposed between the main compressor and receiving three subsystems, fill valve, regulating pressure by controlling the levels of the control valves and the compressor energy spool gas balancing system, to control the pressure stabilization target.

[0017]如图2所示,一种大型氦压缩机站多级压力的控制方法,LP的控制策略是:VI受动态PID控制,LP>LP_SP1时,VI开度减小;当低压LP< LP_SP1时,VI开度增大。 [0017] 2, the control method for a large multi-stage pressure helium compressor station, LP control strategy is: VI by dynamic PID control, LP> LP_SP1 time, VI opening is decreased; when the low pressure LP < when LP_SP1, VI opening degree is increased. V2受专家PID控制,如果LP继续下降至LP< LP_SP2,且HP没有超过高限值HP_HI时,则启动V2辅助调节。 V2 by expert PID control, if the LP continues to drop to LP <LP_SP2, and HP does not exceed the height limit HP_HI, then start the auxiliary regulator V2. V3受PID控制,当LP>LP_HI时,控制V3打开向回收系统泄压。 V3 by PID control, when LP> LP_HI, the control V3 to open the relief recovery system. C1能量滑阀受专家规则控制,当VI开度低于下限值时,主调C1能量滑阀增载;当VI开度高于上限值时,主调C1能量滑阀减载。 C1 expert rules energy control spool valve, when the opening degree is less than the lower limit value VI, C1 melody by energy carrier spool; VI when the degree of opening than the upper limit, energy spool C1 melody load shedding. 能量滑阀的位置变化作用于低压级压缩组机使其排气量发生变化,由此进一步调节LP。 Position change of the energy acting on the slide valve low-pressure stage compressor displacement changes a dryer group, whereby further adjustment of LP. [0018]如图3所示,一种大型氦压缩机站多级压力的控制方法,MP的控制策略是:料与¥6 进行逆向分程控制,V4的PID控制器反作用,V6的PID控制器正作用,且V4与V6互锁;V5受PID 控制,PID控制器的设定值为MP_HI。 [0018] 3, the control method for a large multi-stage pressure helium compressor stations, the control strategy is MP: reverse feed and ¥ 6 Split Control, V4 reaction PID controller, PID control and V6 positive effectors, V4 and V6 and interlocked; V5 by PID control, the PID controller is set MP_HI.

[0019]如图4所示,一种大型氦压缩机站多级压力的控制方法,Hp的控制策略是:V2、V7、 VS作为执行机构,其中V7、VS受PID控制,控制器的设定值分别为HP^SPUHP+SP〗^〗既作为旁通阀辅助调节LP,也防止HP超高起到保护阀的作用,当HP>HP_HI时,强制打开V2向低压路泄压,此时V2不做为LP过程的执行机构。 [0019] As shown in FIG. 4, a control method for large-scale multistage pressure helium compressors station, the control strategy of Hp is: V2, V7, VS as the actuator, wherein V7, VS by the PID control, the controller is arranged respectively setting HP ^ SPUHP + SP ^〗〗 auxiliary regulator bypass valve as both the LP, HP ultra prevented effect valve protect, when HP> HP_HI when forcibly opened to the low pressure line drain V2, then V2 is not implementing agencies LP process.

[0020]如图5所示,一种大型氦压缩机站多级压力的控制方法,HP的控制策略是:由MP和HP综合判断系统是否需要补气,当MP<MP_S且HP<HP_S时,判断系统进入补气状态,此时通过设置V9的PID控制器设定值为LP_SP_S抬升LP进行补气,当补气条件不满足时,其设定降为LP 一SP_D,以此控制V9迅速关闭结束补气。 [0020] 5, the control method for a large multi-stage pressure helium compressor station, the control strategy is HP: HP and integrated by the MP system determines whether qi, when MP <MP_S and HP <HP_S , enters the system determination state qi, this time by setting the PID controller set value V9 LP_SP_S LP for lifting qi, qi when the condition is not satisfied, that sets a SP_D LP reduced, thereby quickly controlling V9 Close the end of qi. 1^_8?_3根据负载变化动态给定,当负载吸气速度增大时,通过增大应的提升补气速度。 1 ^ _8? _3 given dynamic load changes when the load intake velocity is increased by increasing the speed of the corresponding lifting qi.

[0021]上述各控制回路由PLC系统或DCS控制架构实现,压力变送器测量气体压力,通过I/O卡件将压力信号输入到控制层,控制层内的PLC或DCS的控制卡件进行相应计算,又通过I/O卡件将获得控制量输出给控制阀门,控制阀门执行控制动作进行调节。 [0021] The control loop is in each PLC or DCS control system architecture implementation, pressure transmitter measuring a gas pressure, through I / O cards the input pressure signal to the control layer, the control of the PLC or DCS control card carries a layer corresponding calculations, also through I / O cards and obtain the control output to the control valve, the control valve performs control operation to be adjusted.

Claims (6)

  1. 1. 一种大型氦压缩机站多级压力的控制方法,其特征在于:以稳定三级压力为核心控制目标,针对主压缩机组两级串联形成三级压力的结构,在两两压力管路之间设置通路并配以旁通阀实现三级压力内部氦气量的快速调配,以改善单一使用压缩机能量滑阀调节的长时间滞后造成响应速度慢、易超调的缺点;在压缩机站储气、回收、主压缩机组三个子系统之间布置控制阀门,实现主压缩机系统三级压力管路与外部子系统之间的氦气量调配, 通过分解各级压力之间的耦合关系,分别设计了三级压力各自的单变量多个执行机构的协调控制策略,其中: 三级压力中低压压力LP控制回路的执行机构是与高压管路相连的旁通阀VI、V2,与回收系统相连的保护阀V3以及低压级螺杆压缩机组C1能量滑阀,其中旁通阀V1、V2、保护阀V3 均由PID控制器控制; 低压压力LP控制策 The method of controlling multistage pressure helium compressors 1. A large-scale stations, wherein: the core to stabilize the three control target pressure, the pressure structure for the three main groups two compressors connected in series is formed, the pressure line twenty-two bypass passage is provided between the valve and with the pressure inside the helium gas amount to achieve three rapid deployment, to improve the use of a single compressor slide valve regulating the energy caused by slow response time lag, overshoot is easily disadvantage; compressor station is disposed between the control gas, recycling, three sub compressor main valve, between the amount of helium to achieve the three main compressor system pressure line with an external subsystem formulations, by decomposition of the coupling between the pressure levels, respectively, design of the three respective single-variable pressure control strategy for a plurality of coordinated actuator, wherein: three pressure in the low pressure loop control of the actuator LP bypass valve is connected to the high pressure line and VI, V2, is connected to the recovery system the protection valve V3 and a low energy level C1 screw compressor slide valve, wherein the bypass valve V1, V2, V3 protection valve by PID controller; low pressure LP control strategy 是以低压压力LP作为单一被控变量:低压压力LP>设定值LP_SP1 时,控制旁通阀VI开度减小,其中LP_SP1为;当旁通阀VI开度低于下限值时,低压级螺杆压缩机组C1能量滑阀执行增载动作;当低压LP〈设定值LP_SP1时,控制旁通阀VI开度增大,当旁通阀VI开度高于上限值时,低压级螺杆压缩机组C1减载;如果低压压力LP继续下降至低压压力LP〈设定值LP_SP2,则控制旁通阀V2打开辅助调节;当低压压力LP>上限值LP_HI时, 控制保护阀V3打开向回收系统泄压; 三级压力中中压压力MP控制回路的执行机构是与高压管路相连的旁通阀V4,与低压管路相连的旁通阀V5,与高压级螺杆压缩机组C2入口相连的旁通阀V6,其中旁通阀V4、V5、V6 均由PID控制器控制; 中压压力mp控制策略是以中压压力mp作为单一被控变量,由旁通阀V4与旁通阀ve进行逆向分程控制,旁通阀V4的PID控制器反作用,旁通阀 Low pressure LP is controlled as a single variable: the low pressure LP> LP_SP1 set value, the control reducing the opening degree of the bypass valve VI, which is LP_SP1; VI when the bypass valve opening degree is less than the lower limit, a low pressure C1-stage screw compressor slide valve performed by energy carrier operation; when the low pressure LP <the set value LP_SP1, VI controls the bypass valve opening degree is increased, when the opening degree of the bypass valve VI than the upper limit, the low-pressure stage screw compressor C1 shedding; if the low pressure continues to drop to a low pressure LP LP <setpoint LP_SP2, the bypass control valve V2 is opened auxiliary regulator; when the low pressure LP> LP_HI upper limit value, the control valve V3 is opened to recover the protection relief system; intermediate pressure actuator control circuit MP three bypass valve and the pressure in the high pressure line is connected to V4, V5 and bypass valve low-pressure line is connected, is connected to the high pressure stage screw compressor inlet C2 bypass valve V6, wherein the bypass valve V4, V5, V6 PID control by the controller; intermediate pressure intermediate pressure mp mp control strategy as a single controlled variable is carried out by the bypass valve and the bypass valve V4 ve reverse split-range control, PID controller bypass valve V4 reaction, the bypass valve V6的PID控制器正作用,且旁通阀V4与旁通阀V6互锁,只有当其中一个关闭后,才控制另一个进行调节;当MP>上限值MP_HI,控制旁通阀V5打开向低压压力LP管路泄压; 三级压力中高压压力HP控制回路的执行机构是与储气系统相连的收气阀V7、V8,与低压管路相连的旁通阀V2,其中收气阀V7、V8均由PID控制器控制; 高压压力HP的控制策略是:当高压压力HPHP>设定值HP_SP1,控制收气阀V7打开向储气系统收气,当收气阀V7来不及收气,高压压力HP继续升高至高压压力HP>设定值HP_SP2,启动收气阀V8控制;当高压压力HP>上限值HP_HI时,则强制旁通阀V2打开向低压路泄压。 PID controller is acting V6, V4 and bypass valve V6 and bypass valve interlock, wherein only when a closing only be adjusted to control another; when MP> upper limit MP_HI, the control to open the bypass valve V5 a low pressure relief line LP; HP three pressure in the high pressure loop control of the actuator to close the valve is connected to the system with the gas V7, V8, V2 and the bypass valve is connected to low-pressure line, wherein the closing valve V7 , V8 by the PID controller; HP high pressure control strategy is: when the high-pressure HPHP> setpoint HP_SP1, closing the control valve V7 is opened to the gas getter system, when the gas close valve V7 received too late, the high pressure the pressure continues to rise to a high pressure HP HP> setpoint HP_SP2, starts to close the control valve V8; HP_HI upper limit value when the high pressure HP>, forces the bypass valve V2 are opened to the low pressure relief passage.
  2. 2. 根据权利要求1所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:低压压力LP控制策略中,设定值LP_SP1为旁通阀VI的PID控制器的设定值,且旁通阀VI的PID控制器是动态PID控制器,其参数根据系统工况动态调整; 设定值LP_SP2为旁通阀V2的PID控制器的设定值,且旁通阀V2的PID控制器是带有专家规则的PID控制器; 上限值LP_HI为保护阀V3的PID控制器的设定值。 The control method of the multistage pressure helium compressors 1. A large station as claimed in claim, wherein: the low pressure LP control strategy, the setting value LP_SP1 PID controller is a bypass valve VI value, and the bypass valve VI is a dynamic PID controller PID controller, its parameters dynamically adjusted based on system conditions; setpoint value is set to the bypass valve V2 LP_SP2 PID controller, and a bypass valve V2 PID controller is a PID controller with expert rules; upper limit of the PID controller LP_HI protection valve V3 set value.
  3. 3. 根据权利要求1所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:中压压力MP控制策略中,上限值MP_HI为旁通阀V5的PID控制器中设定值。 The control method of multi-stage pressure in the compressor station 1 a large, helium claim, wherein: the intermediate pressure MP in the control strategy, the upper limit of the bypass valve V5 MP_HI a PID controller is provided Value.
  4. 4. 根据权利要求1所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:高压压力HP的控制策略中,设定值HP_SP1为收气阀V7的PID控制器中设定值,设定值HP_SP2为收气阀V8的PID控制器中设定值,上限值HP_HI为旁通阀V2的PID控制器的极限设定值。 The control method of the multistage pressure helium compressors 1. A large station as claimed in claim wherein: the control strategy of the high pressure HP, the setpoint HP_SP1 to close valve V7 is provided a PID controller value is set to a value close valve V8 HP_SP2 PID controller set value, the upper limit value is set as the limit HP_HI bypass valve V2 PID controller.
  5. 5. 根据权利要求1所述的一种大型氦压缩机站多级压力的控制方法,其特征在于:当负载吸气量大于回气量,造成压缩机站系统氦气量减小使得中压压力MP和高压压力HP下降, 当中压压力MP〈补气值MP_S且高压压力HP〈补气值即_8时,判断系统进入补气状态,打开与储气系统相连的补气阀V9由低压管路向系统补气; 补气控制的专家规则是:当满足补气条件时,通过设置补气阀V9的PID控制器设定值为LP_SP_S抬升低压压力LP进行补气,低压压力LP升高使得低压级压缩机机组排气量增大导致中压压力MP升高,中压压力MP升高又使得高压级压缩机机组排气量增大导致高压压力HP 升高;当补气条件不满足时,其设定补气阀V9的PID控制器降为LP_SP_D,以此控制补气阀V9 迅速关闭结束补气,其中补气阀V9的PID控制器设定值据负载变化动态给定,当负载吸气速度增大时,通过增 The control method of the multistage pressure helium compressors station A large claim, wherein: when the load back to the intake air amount, resulting in reducing the amount of helium gas compressor station system so that the intermediate pressure MP HP and high pressure drop, pressure in intermediate pressure MP <qi MP_S value and the high pressure HP <_8 i.e. when the value of qi, qi enters the system determination state, open the gas fill valve V9 is connected to the system by the low pressure conduit system qi; qi control expert rule is: when the conditions are satisfied qi, fill valve V9 is provided by the PID controller is set to the low pressure LP for lifting LP_SP_S qi, such that the low pressure LP elevated pressure stage displacement compressor unit results in increase in the intermediate pressure MP rises, and the intermediate pressure MP rises so that the high-pressure stage compressor unit results in increased displacement high pressure HP increased; when the condition is not satisfied qi which setting a PID controller fill valve V9 reduced LP_SP_D, thereby controlling the fill valve V9 qi rapid closure end, wherein the PID controller set point valve V9 complement the data given dynamic load change, when the load intake when the speed increases, by increasing 补气阀V9的PID控制器设定值LP_SP_S相应的提升补气速度。 Fill valve V9 PID controller set point speed corresponding increase qi LP_SP_S.
  6. 6. 根据权利要求1所述的一种大型氮压缩机站多级压力的控制方法,其特征在于:控制系统由PLC系统或DCS控制架构实现,现场设备层由测量仪表与执行机构组成,通过I/O卡件与控制层相连,控制层为PLC或DCS的控制卡件;PLC或DCS上位机系统通过控制网络与控制层通信,实现监控信号获取与控制组态下载。 The control method of multi-stage pressure of the compressor 1. A station as claimed in claim large nitrogen, wherein: the control system is controlled by a PLC or DCS system architecture implementation, the field device level by the measuring instruments and actuators consisting, by I / O cards is connected to the control layer, the control layer to control a PLC or DCS card member; PLC or DCS control system through the PC communicating with the network control layer, and to achieve control signal obtaining download control configuration.
CN 201710377672 2017-05-25 2017-05-25 Control method for multi-stage pressure of large helium compressor station CN107246390A (en)

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