CN1158504C - 用于控制拥有变速驱动器的制冷器系统中压缩机的方法 - Google Patents
用于控制拥有变速驱动器的制冷器系统中压缩机的方法 Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0201—Current
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0213—Pulses per unit of time (pulse motor)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
本发明仅仅在从零到标准点条件的相应容量范围里使用变速驱动器,并且如果在比额定点电流高的相应条件,VSD断开并且压缩机直接连接在线路上。此方法允许使用尺寸稍小的VSD。同时,如果同一机器上有许多压缩机运行,仅仅只需要一个VSD。VSD驱动第一压缩机从零速度到与线路频率相应的速度。控制器接着切换第一压缩机直接到线路(DOL)并且从第一压缩机断开VSD。VSD接着可以驱动第二压缩机。这个流程可以在多个压缩机间重复。
Description
(1)技术领域
本发明适用于冷却器领域,具体涉及对多个冷却压缩机应用变速驱动器。
(2)背景技术
一个简化的典型空调器或者制冷循环包含转移热量给制冷剂,泵送制冷剂到一个能够散热的地方,并从制冷剂散发热量。制冷剂是一种流体,它可以在低温和低压下通过蒸发吸取热量并且在稍高温度和压强下通过冷凝散发热量。在一个封闭式系统中,制冷剂循环回流到传递给它热量的地方。在一个机械系统中,压缩机将冷却剂从低温低压的流体转变成高温高压的流体。在压缩机转变制冷剂后,使用冷凝器在循环的冷凝阶段通过降温液化流体(气体)。在运行中,来自压缩机热的排放气体(制冷剂蒸汽)进入顶端的冷凝蛇形管,当热量转移到外界时,气体冷凝成液体。制冷剂接着经过一个计量设备,例如膨胀阀,在这里制冷剂在进入蒸发器之前被转变成低温低压的流体。
变速驱动器(VSD)是一个电子设备,它连接在电源线和能够改变电源电压和频率的设备之间。当应用于制冷剂压缩机时,VSD允许持续改变压缩机的速度,利于平稳操作并且有较好的局部加载性能。VSD的造价相对较高,为了在冷却器市场上使用这项技术,这是一个必须解决的重大问题。VSD的费用与已分配器流成比例,这又是压缩机容量和工作条件的函数。为了覆盖VSD驱动压缩机的整个应用范围,必须选择能够提供与最大荷载条件(例如,高冷凝温度和高吸力)相应的电流的VSD。在实际中,每年只有几天压缩机在这种情况下工作。于是存在着一个用这样的方法控制VSD的需要,即实现一台VSD与多台压缩机联合。
(3)发明内容
简言之,本发明仅仅在从零到标准点条件的相应容量范围里使用变速驱动器,并且如果在比额定点电流高的相应条件,VSD断开连接并且压缩机直接连接在线。此方法允许使用尺寸稍小的VSD。同时,如果同一机器上有许多压缩机运行,仅仅只需要一个VSD。VSD驱动第一压缩机从零速度到与线路频率相应的速度。控制器接着切换第一压缩机直接到线路,并且将VSD从第一压缩机断开。VSD然后用于驱动第二台压缩机这个流程可以在多个压缩机间重复。
根据本发明的一个实施例,控制拥有可变速驱动器的制冷器的压缩机中的至少一个的方法包含步骤:(a)检查系统是否需要附加的压缩机容量;(b)如果系统需要附加的压缩机容量,确保至少一个压缩机是从可变速驱动器运行;(c)监视变速驱动器的电流;(d)如果电流大于最大电流的指定的百分比,关闭系统中的电子膨胀阀一指定量;(e)如果电流小于或等于最大电流的指定的百分比,增加变速驱动器的频率一指定量;(f)检查系统需要的附加压缩机容量是否由步骤(e)满足;(g)检查变速驱动器的频率是否与供给变速驱动器的线路电源的频率相同,并且如果不同,再次执行步骤(c)到(f);并且(h)将至少一个压缩机从变速驱动器换接到直接在线。
根据本发明的一个实施例,控制拥有变速驱动器的制冷器系统的至少一个压缩机的装置着检查系统是否需要额外的压缩机容量的装置;如果系统需要额外的压缩机容量,保证至少一个压缩机从变速驱动器运转的装置。监视变速驱动器的电流;如果电流大于最大电流的指定的百分比,关闭系统中的电子膨胀阀的指定量的装置;如果电流小于或等于最大电流的指定的百分比,增加变速驱动器的频率一指定量的装置;检查系统满足增加变速驱动器频率是否需要附加的压缩机容量的装置;检查变速驱动器的频率是否与供给变速驱动器的线路电源的频率相同;如果变速驱动器的频率与线路电源频率相同,转变变速驱动器的至少一个压缩机直接到线路上的装置。
(4)附图说明
图1显示了根据现有技术,与多个压缩机相连的变速驱动器(VSD)。
图2显示了压缩机的运行包络。
图3显示了实现本发明的一个基本控制方法。
(5)具体实施方式
根据图1,一个变速驱动器10可以驱动同一台机器上的若干个压缩机12,14,16。压缩机可以与电源线18(60或者50赫兹)或者VSD 10相连。VSD 10驱动一压缩机马达以达到它的同步速度,接着切换压缩机马达至直接在线(DOL)。即,切换器20,22,和24分别在VSD 10和电源线18之间切换压缩机12,14,16。这个方法并不新颖并且已经在不同的行业使用。
本发明的起因是在传统方法中VSD容量对应于最大输入功率的容量。而本发明将VSD用至优化点,如果系统需要稍高的输入功率,则切换到DOL。在VSD和DOL之间换接存在问题,特别是当许多压缩机在同一个电路里并行运行时电机输入功率(和电源)随着释放压力的增加在增加,在大多数情况下,对于吸入至力初然。
理解压缩机输入功率是两个参数(释放压力和吸入压力)的函数很重要。从而,对于给定的释放压力,如果吸入压力减小,压缩机的输入功率减小。释放压力依赖运行条件,例如,对于一个气冷式冷却器,如果环境温度变高,释放压力也变高;但吸入压力依赖蒸发器里的条件。通常,如果我们想减小输入功率,我们可以对冷凝器压力或吸入压力作用。实际上,对于给定的系统,我们不能对释放压力作任何改动。可以关闭系统的膨胀阀减小吸入压力。如果我们关闭一个电子膨胀阀(EXV),蒸发器的性能受到影响,并且吸入压力减小了。尽管这种情况在通常的运行中不适合,它在VSD和DOL之间转换的短时间里是可行的。
参考图2,显示了压缩机的运行包络30。x轴是饱和吸入温度(SST),象征吸入压力。y轴是饱和冷凝温度(SCT),象征释放压力。星号32对应于标准运行条件并且在此特殊条件下选中提供100%容量的VSD。在假定的情况下,外面的温度比标准温度高,并且离开的水温度也较高。这样影响了运行环境,并且需要从星号32移动到星号34。转换的问题是在星号34,需要的输入功率比VSD能够提供的功率高(I>100%)。
然而,对应于星号32的VSD提供的频率可以比电源线频率(美国为60Hz)低。VSD与DOL之间的转换仅当VSD频率与线路频率相等时可以实现。从而,移动运行环境从星号32到星号34,使用了下面的方法。系统控制器关闭了EXV,它减小了单元容量和吸入压力,从而减小了输入电流。接着,由于输入功率与频率成比例,VSD频率增加了。运行条件从星号32移动到星号36,这使VSD和DOL之间的转换成为可能。位于星号36的运行点影响了单元的性能,但仅仅是瞬时的方式。一旦从VSD到DOL的转换完成并且压缩机马达是DOL,EXV开启并且系统恢复标准的EXV控制,EXV优化了单元的效率。压缩机现在可以运行到DOL方式下的极端条件并且如果需要,VSD可以开始驱动另一个压缩机。
参考图3,显示了实现本发明的一个基本控制方法。流程在第40步开始,此时已经决定了是否需要额外的容量。如果不需要,流程在第99步停止。如果需要额外容量,系统在第42步检查来判断是否所有的压缩机已经运行DOL。如果是好,流程终止。如果不是,第44步检查是否一个压缩机已由VSD运行。如果不是,该压缩机在第46步开始。接着,在第48步,检查VSD电流是否接近VSD电流最大值。这个例子中,检查VSD电流是否小于VSD最大电流的99%,但是可以使用其他的范围。如果不能,EXV关闭最小数目,这里在第50步显示为1%,并且再次检查了VSD电流。如果VSD电流比VSD最大电流的99%大或者相等,VSD频率增加最小限度,这里显示的为1%,从而增加了输入功率。可以根据系统调整EXV和VSD频率的精确改变。
在第54步,系统检查是否满足了额外的容量。如果满足了,流程停止。如果没有,检查VSD频率是否到达线路频率。如果没有到达,流程返回到第48步。如果VSD频率已经达到线路频率,系统在第58步转换压缩机到DOL。转换之后,在第60步检查,EXV位置是否已经优化,如果是的,过程停止,否则,EXV位置在第62步最优化。如果系统需要额外的容量,流程就会开始。
Claims (6)
1.一种用于控制拥有变速驱动器的制冷器系统中至少一个压缩机的方法,其特征在于,包含以下步骤:
a)检查所述系统是否需要额外的压缩机容量;
b)如果所述系统需要附加的压缩机容量,确保所述至少一个压缩机正在以变速驱动器为动力而运行;
c)监视所述变速驱动器的电流;
d)如果所述电流大于最大电流的某个指定百分比,在所述系统中关闭电子膨胀阀某一指定量;
e)如果所述电流小于或等于所述最大电流的所述指定百分比,对所述变速驱动器的频率增加某一指定量;
f)检查所述系统需要的所述附加压缩机容量是否由步骤(e)满足;
g)检查所述变速驱动器的所述频率是否与供给所述变速驱动器的线路电能频率相同,并且如果不同,再次执行步骤(c)到(f);并且
h)将所述至少一个压缩机从变速驱动器换接到直接在线。
2.如权利要求1所述的方法,其特征在于,在换接的步骤之后,还包括优化所述的电子膨胀阀之位置的步骤。
3.如权利要求1所述的方法,其特征在于,所述的最大电流的指定百分比是99%。
4.如权利要求3所述的方法,其特征在于,用于关闭所述电子膨胀阀的指定量是1%。
5.如权利要求4所述的方法,其特征在于,用于增加所述频率的指定量是1%。
6.如权利要求1所述的方法,其特征在于,所述至少一个压缩机包含至少第一和第二压缩机,所述第一压缩机是直接在线运行,所述确保步骤包含下述步骤,即检查所述第一和第二压缩机是否直接在线运行,并且如果不是,开始将所述第二压缩机以所述变速驱动器为动力而运行。
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Application Number | Priority Date | Filing Date | Title |
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US09/652,341 US6370888B1 (en) | 2000-08-31 | 2000-08-31 | Method for controlling variable speed drive with chiller equipped with multiple compressors |
US09/652,341 | 2000-08-31 |
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US (1) | US6370888B1 (zh) |
EP (1) | EP1184631B1 (zh) |
JP (1) | JP3948919B2 (zh) |
CN (1) | CN1158504C (zh) |
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Cited By (2)
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CN101095019B (zh) * | 2005-01-03 | 2010-05-12 | 阿塞里克股份有限公司 | 冷却设备和控制方法 |
CN102812247A (zh) * | 2010-01-11 | 2012-12-05 | 英瑞杰汽车系统研究公司 | 用于调节scr系统的泵的方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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AU2002236748A1 (en) * | 2002-01-11 | 2004-02-16 | Carrier Corporation | Variable speed control of multiple compressors |
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- 2001-08-03 DE DE60123719T patent/DE60123719T2/de not_active Expired - Lifetime
- 2001-08-03 ES ES01202944T patent/ES2270952T3/es not_active Expired - Lifetime
- 2001-08-03 EP EP01202944A patent/EP1184631B1/en not_active Expired - Lifetime
- 2001-08-31 JP JP2001263553A patent/JP3948919B2/ja not_active Expired - Fee Related
- 2001-08-31 CN CNB011312653A patent/CN1158504C/zh not_active Expired - Fee Related
- 2001-08-31 BR BR0103839-7A patent/BR0103839A/pt not_active IP Right Cessation
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CN101095019B (zh) * | 2005-01-03 | 2010-05-12 | 阿塞里克股份有限公司 | 冷却设备和控制方法 |
CN102812247A (zh) * | 2010-01-11 | 2012-12-05 | 英瑞杰汽车系统研究公司 | 用于调节scr系统的泵的方法 |
CN102812247B (zh) * | 2010-01-11 | 2015-07-29 | 英瑞杰汽车系统研究公司 | 用于调节scr系统的泵的方法 |
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EP1184631B1 (en) | 2006-10-11 |
US6370888B1 (en) | 2002-04-16 |
BR0103839A (pt) | 2002-06-04 |
EP1184631A1 (en) | 2002-03-06 |
DE60123719T2 (de) | 2007-10-04 |
JP3948919B2 (ja) | 2007-07-25 |
ES2270952T3 (es) | 2007-04-16 |
CN1340683A (zh) | 2002-03-20 |
DE60123719D1 (de) | 2006-11-23 |
JP2002130148A (ja) | 2002-05-09 |
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