CN116105461A - Control system and control method of energy power station - Google Patents
Control system and control method of energy power station Download PDFInfo
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- CN116105461A CN116105461A CN202310179887.4A CN202310179887A CN116105461A CN 116105461 A CN116105461 A CN 116105461A CN 202310179887 A CN202310179887 A CN 202310179887A CN 116105461 A CN116105461 A CN 116105461A
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
Abstract
The invention relates to the technical field of energy power stations, and provides a control system and a control method of an energy power station, wherein the control system comprises the following steps: at least two refrigerating hosts with frequency modulation function, a chilled water liquid inlet pipe, a chilled water liquid outlet pipe, a cooling device and a control device, wherein the control device is electrically connected with the first temperature sensor, the second temperature sensor and the refrigerating hosts, and controls the running frequency of the refrigerating hosts and/or the running number of the refrigerating hosts by receiving information monitored by the first temperature sensor and the second temperature sensor. According to the invention, the first temperature sensor and the second temperature sensor are respectively arranged on the chilled water inlet pipe and the chilled water outlet pipe in a corresponding manner and are used for monitoring the chilled water inlet temperature and the chilled water outlet temperature, and the control device receives the inlet temperature and the outlet temperature data and controls the running frequency and/or the running number of the refrigeration host according to the data, so that the energy power station can realize the purpose of energy-saving running under the condition of ensuring stable running.
Description
Technical Field
The invention relates to the technical field of energy power stations, in particular to a control system and a control method of an energy power station.
Background
Along with the progress of industrialization and township, more and more reconstruction and expansion plants and public buildings are built, and in order to create a comfortable environment, the energy source power station is required to supply corresponding energy, and the energy saving requirement is higher and higher nowadays, so that the adoption of a set of simplified automatic control system is particularly important. In the prior art, the control logic for the energy power station is simple, and the aim of saving energy is difficult to realize at the same time under the condition of ensuring the stable operation of the system.
In order to meet the aim of high-efficiency energy-saving operation of the energy power station at present, adjustment and control are needed according to the energy utilization rate of different time periods, so that the stable operation of the system is ensured, and the aim of energy saving is achieved.
Disclosure of Invention
The invention provides a control system and a control method of an energy power station, which are used for solving the defect that the energy power station in the prior art is difficult to realize energy saving under the condition of ensuring stable operation.
The invention provides a control system of an energy power station, which comprises:
at least two refrigeration hosts with frequency modulation function, wherein a first heat exchange pipeline and a second heat exchange pipeline are arranged in the refrigeration hosts, and the first heat exchange pipeline is thermally coupled with the second heat exchange pipeline;
the chilled water inlet pipe is connected with the first heat exchange pipeline of the refrigeration host, and a first temperature sensor is arranged on the chilled water inlet pipe;
the chilled water outlet pipe is connected with the first heat exchange pipeline of the refrigeration host, and a second temperature sensor is arranged on the chilled water outlet pipe;
the second heat exchange pipeline is connected with the cooling device;
the control device is electrically connected with the first temperature sensor, the second temperature sensor and the refrigeration host, and correspondingly controls the operation frequency of the refrigeration host and/or controls the operation number of the refrigeration host by receiving information monitored by the first temperature sensor and the second temperature sensor.
According to the control system of the energy power station that this application provided, chilled water feed pipe includes:
the chilled water inlet branch pipe is connected with a first heat exchange pipeline of the refrigeration host through a pipeline system, and a first water pump is arranged on the chilled water inlet branch pipe;
the chilled water inlet main pipe is connected with the chilled water inlet branch pipe, and the first temperature sensor is arranged on the chilled water inlet main pipe.
According to the control system of the energy power station that this application provided, the chilled water drain pipe includes:
the chilled water liquid outlet branch pipes are connected with the first heat exchange pipelines of the refrigeration host in one-to-one correspondence, the second temperature sensor is arranged on the chilled water liquid outlet branch pipes, and the chilled water liquid outlet branch pipes are also provided with first valves;
the chilled water outlet main pipe is connected with the chilled water outlet branch pipe and the pipeline system.
According to the control system of the energy power station provided by the application, the control system further comprises: the bypass loop is connected between the chilled water inlet main pipe and the chilled water outlet main pipe, and a bypass valve is arranged on the bypass loop.
According to the control system of the energy power station that this application provided, still include the cooling water feed liquor pipe, the cooling water feed liquor pipe includes:
the cooling water inlet branch pipe is connected with a second heat exchange pipeline of the refrigeration host through a pipeline system, and a second water pump is arranged on the cooling water inlet branch pipe;
and the cooling water inlet main pipe is connected between the cooling water inlet branch pipe and the cooling device.
According to the control system of the energy power station that this application provided, still include the cooling water drain pipe, the cooling water drain pipe includes:
the cooling water outlet branch pipes are connected with the second heat exchange pipeline of the refrigeration host in one-to-one correspondence, and a second valve is arranged on the cooling water outlet branch pipes;
the cooling water outlet main pipe is connected among the cooling water outlet branch pipe, the pipeline system and the cooling device.
According to the control system of the energy power station provided by the application, the control system further comprises:
the third valve is arranged on the chilled water inlet branch pipe;
the fourth valve is arranged on the chilled water outlet branch pipe;
and the fifth valve is arranged on the bypass loop.
According to the control system of the energy power station provided by the application, the control system further comprises:
the sixth valve is arranged on the cooling water inlet branch pipe;
the seventh valve is arranged on the cooling water outlet branch pipe;
the eighth valve is arranged at the inlet of the cooling device;
and the ninth valve is arranged at the outlet of the cooling device.
The application also provides a control method of the energy power station, and the control method of the control system of the energy power station provided by the application comprises the following steps:
s1, setting a first preset temperature value and a second preset temperature value;
s2, monitoring a first temperature value through a second temperature sensor, comparing the first temperature value with a first preset temperature value, and judging whether the energy power station has a fault or not according to the relation between the first temperature value and the first preset temperature value;
and S3, if the energy power station has no fault after the judgment of the step S2, monitoring a second temperature value through the first temperature sensor, comparing the second temperature value with a second preset temperature value, and adjusting the operation frequency of the refrigeration host and/or adjusting the number of the operation hosts according to the magnitude relation between the second temperature value and the second temperature preset value.
According to a control method of an energy power station provided in the present application,
in step S2, judging whether the energy power station has a fault according to the relation between the first temperature value and the first preset temperature value, which specifically includes:
if the first temperature value is equal to the first preset temperature value, jumping to the step S3;
if the first temperature value is not equal to the first preset temperature value, the energy power station fails and needs to be maintained;
in step S3, according to the magnitude relation between the second temperature value and the second temperature preset value, the operation frequency of the refrigeration host and/or the number of operation hosts and the number of operation devices of the cooling device are adjusted, which specifically includes:
if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed;
if the value of the second temperature value is smaller than the second temperature preset value, gradually reducing the running frequency of the refrigeration host until the value of the second temperature value is equal to the value of the second temperature preset value; if the operating frequency of the refrigerating host is reduced, the value of the second temperature value is continuously smaller than the second temperature preset value, opening a bypass valve between the chilled water inlet pipe and the chilled water outlet pipe, and gradually opening the opening of the bypass valve until the value of the second temperature value is equal to the value of the second temperature preset value; if the bypass valve is completely opened, the value of the second temperature value is continuously smaller than the second temperature preset value, and the refrigerating host machine is stopped until the value of the second temperature value is equal to the value of the second temperature preset value;
if the value of the second temperature value is larger than the second temperature preset value, the number of operation of the refrigeration host is increased, and after the operation is set for a time, the magnitude relation between the second temperature value and the second temperature preset value is compared; if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed; if the value of the second temperature value is larger than the second temperature preset value, the energy power station is unreasonable in design and needs to be redesigned; and if the value of the second temperature value is smaller than the second temperature preset value, gradually reducing the operating frequency of one of the refrigeration hosts until the value of the second temperature value is equal to the value of the second temperature preset value.
According to the control system and the control method of the energy power station, the first temperature sensor and the second temperature sensor are respectively arranged on the chilled water liquid inlet pipe and the chilled water liquid outlet pipe in a corresponding mode and are used for monitoring the chilled water liquid inlet temperature and the chilled water liquid return temperature, and the control device receives the liquid inlet temperature and the chilled water liquid return temperature data and controls the running frequency and/or the running number of the refrigerating host according to the data, so that the energy power station can realize the purpose of energy-saving running under the condition of guaranteeing stable running.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control system for an energy power station according to the present invention;
FIG. 2 is a schematic diagram of a chilled water system in a control system of an energy power station according to the present invention;
FIG. 3 is a schematic diagram of a cooling water system in the control system of the energy power station according to the present invention
Fig. 4 is a schematic flow chart of a control method of an energy power station provided by the invention.
Reference numerals:
1: a refrigeration host; 21: chilled water inlet branch pipes; 22: a chilled water feed main pipe; 23: a chilled water outlet manifold; 24: a chilled water outlet main pipe; 31: a cooling water inlet branch pipe; 32: a cooling water inlet main pipe; 33: a cooling water outlet branch pipe; 34: a cooling water outlet main pipe; 41: a first temperature sensor; 42: a second temperature sensor; 5: a cooling device; 51: a liquid level sensor; 6: a bypass circuit; 61: a bypass valve; 71: a first valve; 72: a second valve; 73: a third valve; 74: a fourth valve; 75: a fifth valve; 76: a sixth valve; 77: a seventh valve; 78: an eighth valve; 79: a ninth valve; 81: a first water pump; 82: a second water pump; 91: a first pressure sensor; 92: a second pressure sensor; 10: a pipeline system; 11: a flow meter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A control system of an energy power station of the present invention is described below with reference to fig. 1 to 3. The control system of the energy power station comprises: at least two refrigerating hosts 1 with frequency modulation function, a chilled water liquid inlet pipe, a chilled water liquid outlet pipe, a cooling water liquid inlet pipe, a cooling water liquid outlet pipe, a cooling device 5 and a control device. The liquid inlet and outlet directions of the chilled water and the liquid inlet and outlet directions of the cooling water are both defined by taking the refrigerating host 1 as a reference, the chilled water outlet pipe is used for being supplied into the terminal air conditioning system, and the chilled water inlet pipe is used for receiving a medium flowing out of the terminal air conditioning system. Specifically, as shown in fig. 2 and 3, the present control system includes a chilled water system and a cooling water system.
The refrigeration host 1 is internally provided with a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is thermally coupled with the second heat exchange pipeline, and in the refrigeration host 1, the cold quantity input through the second heat exchange pipeline exchanges heat with a medium in the first heat exchange pipeline to provide the cold quantity.
The chilled water liquid inlet pipe is connected with a first heat exchange pipeline of the refrigeration host 1, a circulating medium enters the refrigeration host 1 through the chilled water liquid inlet pipe and exchanges heat with the medium in the second heat exchange pipeline through the first heat exchange pipeline, and a first temperature sensor 41 is arranged on the chilled water liquid inlet pipe to monitor the temperature of an input medium, and the monitored Wen Duming is named as a second temperature value.
The chilled water liquid outlet pipe is connected with a first heat exchange pipeline of the refrigeration host 1, after heat exchange, the circulating medium is discharged from the refrigeration host 1 through the chilled water liquid outlet pipe, and a second temperature sensor 42 is arranged on the chilled water liquid outlet pipe to monitor the temperature of the output medium, and the monitored temperature is named as a first temperature value.
The second heat exchange pipeline is connected with the cooling device 5, specifically, a cooling water inlet pipe and a cooling water outlet pipe are arranged between the second heat exchange pipeline and the cooling device 5: one end of a cooling water liquid inlet pipe is connected with a second heat exchange pipeline of the refrigeration host 1, one end of a cooling water liquid outlet pipe is connected with the second heat exchange pipeline of the refrigeration host 1, and the other end of the cooling water liquid inlet pipe and the other end of the cooling water liquid outlet pipe are respectively connected with the cooling device 5. In this embodiment, the cooling device 5 adopts a cooling tower equipped with a liquid level sensor 51, and the medium in the cooling tower is conveyed to the second heat exchange pipeline of the refrigeration host 1 through a cooling water inlet pipe, exchanges heat with the medium in the first heat exchange pipeline, and is discharged from the second heat exchange pipeline of the refrigeration host 1 through a cooling water outlet pipe. Part or all of the medium discharged from the cooling water outlet pipe can continuously flow back to the cooling tower for recycling.
The control device is electrically connected with the first temperature sensor 41, the second temperature sensor 42 and the refrigeration host 1, and correspondingly controls the operation frequency of the refrigeration host 1 and/or controls the operation number of the refrigeration host 1 by receiving information monitored by the first temperature sensor 41 and the second temperature sensor 42. The liquid inlet temperature and the liquid return temperature of the refrigeration host 1 are monitored through the first temperature sensor 41 and the second temperature sensor 42, the monitored temperatures are compared with preset temperatures, and the operation frequency of the refrigeration host 1 and/or the number of operation of the refrigeration host 1 are controlled according to the comparison results, so that the purpose of saving energy is achieved while the stable operation of the energy power station is ensured. Further, in order to ensure that the refrigeration host 1 can obtain sufficient cooling capacity from the cooling tower, the regulation of the cooling tower should be synchronized with the regulation of the refrigeration host 1, for example: if the number of the operation units of the refrigeration host 1 is increased or the operation frequency is increased, more cooling capacity is needed, and the operation can be realized by increasing the number of the operation units of the cooling tower or increasing the operation frequency of the cooling tower; conversely, if the operating frequency of the cooling main unit 1 is reduced, less cooling capacity is required, and the purpose of energy saving can be achieved by reducing the operating frequency of the cooling tower. In summary, the cooling capacity of the cooling tower should be matched to the cooling capacity required by the refrigeration host 1.
According to the control system of the energy power station, the first temperature sensor 41 and the second temperature sensor 42 are respectively arranged on the chilled water inlet pipe and the chilled water outlet pipe in a corresponding mode and are used for monitoring the chilled water inlet temperature and the chilled water outlet temperature, and the control device receives the inlet temperature and the outlet temperature data and controls the running frequency and/or the running number of the refrigerating host 1 according to the data, so that the energy power station can realize the purpose of energy-saving running under the condition of guaranteeing stable running.
In one embodiment of the present invention, a chilled water feed line comprises: a chilled water feed branch pipe 21 and a chilled water feed main pipe 22. The chilled water inlet branch pipe 21 is connected with a first heat exchange pipeline of the refrigeration host 1 through a pipeline system 10, and a first water pump 81 is arranged on the chilled water inlet branch pipe 21; the main chilled water feed pipe 22 is connected to the chilled water feed branch pipe 21, and the first temperature sensor 41 is provided on the main chilled water feed pipe 22. Specifically, the incoming flow of the chilled water inlet main pipe 22 is accessed by the terminal air conditioning system, the inlet temperature is measured by the first temperature sensor 41, and the medium enters each chilled water inlet branch pipe 21 through the chilled water inlet main pipe 22, is pumped into the pipeline system 10 by the first water pump 81, then enters the first heat exchange pipeline of the refrigeration host 1, and exchanges heat with the medium in the second heat exchange pipeline. Further, when adjusting the operation frequency of the refrigeration host 1 and/or adjusting the number of operations of the refrigeration host 1, the operation frequency of the first water pump 81 and/or the number of operations of the first water pump 81 should be adjusted synchronously to meet the requirement of liquid inlet adjustment.
In one embodiment of the invention, a chilled water outflow tube comprises: a chilled water outlet branch pipe 23 and a chilled water outlet main pipe 24. Wherein, the chilled water liquid outlet branch pipes 23 are connected with the first heat exchange pipeline of the refrigeration host 1 in a one-to-one correspondence manner, the second temperature sensor 42 is arranged on the chilled water liquid outlet branch pipes 23, and the chilled water liquid outlet branch pipes 23 are also provided with a first valve 71; the chilled water liquid outlet main 24 is connected to the chilled water liquid outlet branch 23 and the pipe system 10. Specifically, after the medium in the first heat exchange pipeline is subjected to heat exchange, the medium is discharged through the chilled water outlet branch pipe 23, the liquid temperature measured by the second temperature sensor 42 and the liquid outlet amount regulated by the first valve 71 are converged with the medium in the pipeline system 10, and then the medium is introduced into the chilled water outlet main pipe 24 and flows back to the terminal air conditioning system.
In one embodiment of the present invention, the control system of the energy power station further includes: the bypass circuit 6, the bypass circuit 6 is connected between the chilled water inlet main pipe 22 and the chilled water outlet main pipe 24, the bypass circuit 6 is provided with a bypass valve 61, and a part of medium in the chilled water inlet main pipe 22 can be directly returned to the chilled water outlet main pipe 24 by opening the bypass valve 61, and the part of medium is not cooled by the refrigeration host 1. Further, a temperature sensor, a first pressure sensor 91 and a flowmeter 11 are arranged at the inlet of the chilled water liquid inlet main pipe 22, and a second pressure sensor 92 is arranged at the outlet of the chilled water liquid outlet main pipe 24 so as to monitor medium liquid inlet and liquid outlet and give guidance to the opening adjustment of the bypass valve 61.
In one embodiment of the present invention, a cooling water inlet pipe includes: a cooling water inlet branch pipe 31 and a cooling water inlet main pipe 32. The cooling water inlet branch pipe 31 is connected with a second heat exchange pipeline of the refrigeration host 1 through the pipeline system 10, and a second water pump 82 is arranged on the cooling water inlet branch pipe 31; the cooling water inlet main pipe 32 is connected between the cooling water inlet branch pipe 31 and the cooling device 5. Specifically, the refrigerant medium output by the cooling tower passes through the main cooling water inlet pipe 32, the pipeline system 10 and each cooling water inlet branch pipe 31, and is pumped into the second heat exchange pipeline of the refrigeration host 1 by the second water pump 82 to exchange heat with the medium in the first heat exchange pipeline.
In one embodiment of the present invention, the cooling water outlet pipe includes: a cooling water outlet branch pipe 33 and a cooling water outlet main pipe 34. The cooling water outlet branch pipes 33 are connected with the second heat exchange pipeline of the refrigeration host 1 in a one-to-one correspondence manner, and the cooling water outlet branch pipes 33 are provided with second valves 72; the cooling water outlet main pipe 34 is connected between the cooling water outlet branch pipe 33, the pipe system 10 and the cooling device 5. Specifically, the medium after heat exchange is discharged through the second heat exchange pipeline of the refrigeration host 1, and the flow of the medium is controlled by the second valve 72 through the cooling water outlet branch pipe 33, and then flows through the cooling water outlet main pipe 34 after being combined with the medium in the pipeline system 10, and part (or all) of the medium flows back to the cooling tower.
In one embodiment of the present invention, the control system of the energy power station further includes: third valve 73, fourth valve 74, fifth valve 75, sixth valve 76, seventh valve 77, eighth valve 78, and ninth valve 79. Wherein the third valve 73 is arranged on the chilled water inlet branch pipe 21; the fourth valve 74 is arranged on the chilled water outlet branch pipe 23; a fifth valve 75 is provided on the bypass circuit 6; the sixth valve 76 is arranged on the cooling water inlet branch pipe 31; the seventh valve 77 is arranged on the cooling water outlet branch pipe 33; the eighth valve 78 is arranged at the inlet of the cooling device 5; a ninth valve 79, the ninth valve 79 being provided at the outlet of the cooling device 5. In this embodiment, the valves are all valve assemblies, and the valve assemblies are closed to disconnect the pipelines when the first valve 71, the second valve 72 or other components in the pipelines need to be replaced, so as to avoid medium outflow.
A control method of an energy power station according to the present invention, which is a control method of a control system of an energy power station according to the above-described embodiment, will be described below with reference to fig. 4. The control method comprises the following steps:
s1, setting a first preset temperature value and a second preset temperature value;
s2, monitoring a first temperature value through a second temperature sensor 42, comparing the first temperature value with a first preset temperature value, and judging whether the energy power station has a fault or not according to the relation between the first temperature value and the first preset temperature value;
and S3, if the energy power station has no fault after the judgment of the step S2, the second temperature value is monitored through the first temperature sensor 41 and is compared with a second preset temperature value, and the operation frequency of the refrigeration host 1 and/or the number of operation hosts of the refrigeration host 1 are/is adjusted according to the magnitude relation between the second temperature value and the second preset temperature value.
Further, in step S2, whether the energy power station has a fault is determined according to the relationship between the first temperature value and the first preset temperature value, which specifically includes:
if the first temperature value is equal to the first preset temperature value, jumping to the step S3;
if the first temperature value is not equal to the first preset temperature value, the energy power station fails and needs to be maintained;
in step S3, according to the magnitude relation between the second temperature value and the second temperature preset value, the operation frequency of the refrigeration host 1 is adjusted and/or the number of operation of the refrigeration host 1 and the number of operation of the cooling device 5 are adjusted, which specifically includes:
if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed;
if the value of the second temperature value is smaller than the second temperature preset value, gradually reducing the operating frequency of the refrigeration host 1 until the value of the second temperature value is equal to the value of the second temperature preset value; if the value of the second temperature value is continuously smaller than the second temperature preset value after the operation frequency of the refrigeration host 1 is reduced, opening a bypass valve 61 between the chilled water liquid inlet pipe and the chilled water liquid outlet pipe, and gradually opening the opening of the bypass valve 61 until the value of the second temperature value is equal to the value of the second temperature preset value; if the bypass valve 61 is fully opened, the value of the second temperature value is continuously smaller than the second temperature preset value, and the refrigeration host 1 is stopped until the value of the second temperature value is equal to the value of the second temperature preset value;
if the value of the second temperature value is larger than the second temperature preset value, the number of operation of the refrigeration host 1 is increased, and after the operation is set for a time, the magnitude relation between the second temperature value and the second temperature preset value is compared; if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed; if the value of the second temperature value is larger than the second temperature preset value, the energy power station is unreasonable in design and needs to be redesigned; if the value of the second temperature value is smaller than the second temperature preset value, the operating frequency of one of the refrigeration hosts 1 is gradually reduced until the value of the second temperature value is equal to the value of the second temperature preset value.
The following is a specific example:
the complete control logic can be obtained and is determined by the point position to be controlled, so that a specific point position table can be obtained according to various devices, and the point position table is as follows:
note that: DI is digital input, DO is digital output, AI is analog input, AO is analog output.
Assume that there is one energy power station, as illustrated in fig. 1: there are 2 main refrigerating machines, 2 first water pumps, 2 second water pumps, 2 cooling towers forming a cooling tower group, and the liquid supply and return temperature of 7 ℃/12 ℃ needs to be provided for the tail end stably. The starting sequence is that a first valve/a second valve is started, a cooling tower fan 1 is started, a second water pump 1 is started, a first water pump 1 is started, a refrigerating host is started, after the refrigerating host is operated for 1 hour, whether a second temperature sensor is 7 ℃ or not is firstly observed, if not, whether the temperature of a branch is not enough to meet the requirement needs to be observed, fault repair is needed, if yes, whether the temperature of the first temperature sensor is 12 ℃ or not is then observed again, if yes, the system is stably operated without adjustment, and if not, the refrigerating host is divided into two conditions, wherein one condition is higher than 12 ℃ and the other condition is lower than 12 ℃.
The first condition (the first temperature sensor is higher than 12 ℃) indicates that the end load is higher than the cooling capacity provided by the unit, so that the unit needs to be subjected to machine adding operation, meanwhile, the number and frequency of the water pumps are also adjusted, the actual sequence is to increase the numbers of the refrigerating host and the water pumps to 2, the temperature of the first temperature sensor of the system is observed after the operation is carried out for 1 hour, whether the temperature meets the requirement of 12 ℃, and if so, the system is stably operated. If it is not 12 ℃, two cases need to be considered: if the temperature is higher than 12 ℃, the system is unreasonable in design and needs to be redesigned; if the temperature is less than 12 ℃, the refrigerating capacity required by the system exceeds the refrigerating capacity required by the tail end, the refrigerating capacity of the main machine needs to be regulated, the general adopted sequence is to operate a refrigerating main machine at low frequency, firstly, the load is reduced to 75 percent, and then, the operating frequency of the water pump is regulated according to the actual water quantity to meet the load requirement of the refrigerating main machine. The specific sequence is to reduce the cooling capacity of a refrigeration host to 75% -reduce the operation frequency of a water pump. If not, the process continues to be reduced to 50% and 25%. If the frequency is adjusted to 25%, the requirements can be met, and then the cold energy of two refrigeration hosts of the system is adjusted and uniformly distributed to each refrigeration host, so that the system can operate more efficiently.
In the second case (the first temperature sensor is lower than 12 ℃), the running load of the refrigeration host needs to be reduced, the running frequency of the water pump is adjusted, and the running sequence can run with reference to the first case, namely, the running sequence is gradually adjusted to 75% -50% -25%. However, if the temperature is adjusted to 25%, the system still is lower than the requirement of 12 ℃, namely the opening of the bypass valve is required to be adjusted, the opening is adjusted according to the lowest opening, after the operation is carried out for 30 minutes, whether the actual liquid inlet temperature can meet the requirement is checked, if not, the opening is continuously increased until the valve is fully opened; if the system feed liquid temperature requirement is still not met. The refrigerating host machine is required to be shut down for operation, and the refrigerating host machine is started up again when the subsequent liquid inlet temperature meets the requirement, so that the refrigerating host machine is operated in a circulating and reciprocating mode.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A control system for an energy power station, comprising:
at least two refrigeration hosts with frequency modulation function, wherein a first heat exchange pipeline and a second heat exchange pipeline are arranged in the refrigeration hosts, and the first heat exchange pipeline is thermally coupled with the second heat exchange pipeline;
the chilled water inlet pipe is connected with the first heat exchange pipeline of the refrigeration host, and a first temperature sensor is arranged on the chilled water inlet pipe;
the chilled water outlet pipe is connected with the first heat exchange pipeline of the refrigeration host, and a second temperature sensor is arranged on the chilled water outlet pipe;
the second heat exchange pipeline is connected with the cooling device;
the control device is electrically connected with the first temperature sensor, the second temperature sensor and the refrigeration host, and correspondingly controls the operation frequency of the refrigeration host and/or controls the operation number of the refrigeration host by receiving information monitored by the first temperature sensor and the second temperature sensor.
2. The control system of an energy power station of claim 1, wherein the chilled water feed line comprises:
the chilled water inlet branch pipe is connected with a first heat exchange pipeline of the refrigeration host through a pipeline system, and a first water pump is arranged on the chilled water inlet branch pipe;
the chilled water inlet main pipe is connected with the chilled water inlet branch pipe, and the first temperature sensor is arranged on the chilled water inlet main pipe.
3. The control system of an energy power station of claim 2, wherein the chilled water outlet pipe comprises:
the chilled water liquid outlet branch pipes are connected with the first heat exchange pipelines of the refrigeration host in one-to-one correspondence, the second temperature sensor is arranged on the chilled water liquid outlet branch pipes, and the chilled water liquid outlet branch pipes are also provided with first valves;
the chilled water outlet main pipe is connected with the chilled water outlet branch pipe and the pipeline system.
4. The control system of an energy power station of claim 3, further comprising: the bypass loop is connected between the chilled water inlet main pipe and the chilled water outlet main pipe, and a bypass valve is arranged on the bypass loop.
5. The control system of an energy power station of claim 1, further comprising a cooling water inlet pipe comprising:
the cooling water inlet branch pipe is connected with a second heat exchange pipeline of the refrigeration host through a pipeline system, and a second water pump is arranged on the cooling water inlet branch pipe;
and the cooling water inlet main pipe is connected between the cooling water inlet branch pipe and the cooling device.
6. The energy power station control system of claim 5, further comprising a cooling water outlet pipe, the cooling water outlet pipe comprising:
the cooling water outlet branch pipes are connected with the second heat exchange pipeline of the refrigeration host in one-to-one correspondence, and a second valve is arranged on the cooling water outlet branch pipes;
the cooling water outlet main pipe is connected among the cooling water outlet branch pipe, the pipeline system and the cooling device.
7. The control system of an energy power station of claim 4, further comprising:
the third valve is arranged on the chilled water inlet branch pipe;
the fourth valve is arranged on the chilled water outlet branch pipe;
and the fifth valve is arranged on the bypass loop.
8. The control system of an energy power station of claim 6, further comprising:
the sixth valve is arranged on the cooling water inlet branch pipe;
the seventh valve is arranged on the cooling water outlet branch pipe;
the eighth valve is arranged at the inlet of the cooling device;
and the ninth valve is arranged at the outlet of the cooling device.
9. A control method of an energy power station, characterized by a control method of a control system of the energy power station according to any one of claims 1 to 8, comprising:
s1, setting a first preset temperature value and a second preset temperature value;
s2, monitoring a first temperature value through a second temperature sensor, comparing the first temperature value with a first preset temperature value, and judging whether the energy power station has a fault or not according to the relation between the first temperature value and the first preset temperature value;
and S3, if the energy power station has no fault after the judgment of the step S2, monitoring a second temperature value through the first temperature sensor, comparing the second temperature value with a second preset temperature value, and adjusting the operation frequency of the refrigeration host and/or adjusting the number of the operation hosts according to the magnitude relation between the second temperature value and the second temperature preset value.
10. The method for controlling an energy power station according to claim 9, wherein,
in step S2, judging whether the energy power station has a fault according to the relation between the first temperature value and the first preset temperature value, which specifically includes:
if the first temperature value is equal to the first preset temperature value, jumping to the step S3;
if the first temperature value is not equal to the first preset temperature value, the energy power station fails and needs to be maintained;
in step S3, according to the magnitude relation between the second temperature value and the second temperature preset value, the operation frequency of the refrigeration host and/or the number of operation hosts and the number of operation devices of the cooling device are adjusted, which specifically includes:
if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed;
if the value of the second temperature value is smaller than the second temperature preset value, gradually reducing the running frequency of the refrigeration host until the value of the second temperature value is equal to the value of the second temperature preset value; if the operating frequency of the refrigerating host is reduced, the value of the second temperature value is continuously smaller than the second temperature preset value, opening a bypass valve between the chilled water inlet pipe and the chilled water outlet pipe, and gradually opening the opening of the bypass valve until the value of the second temperature value is equal to the value of the second temperature preset value; if the bypass valve is completely opened, the value of the second temperature value is continuously smaller than the second temperature preset value, and the refrigerating host machine is stopped until the value of the second temperature value is equal to the value of the second temperature preset value;
if the value of the second temperature value is larger than the second temperature preset value, the number of operation of the refrigeration host is increased, and after the operation is set for a time, the magnitude relation between the second temperature value and the second temperature preset value is compared; if the second temperature value is equal to the value of the second temperature preset value, the energy power station meets the requirement, and adjustment is not needed; if the value of the second temperature value is larger than the second temperature preset value, the energy power station is unreasonable in design and needs to be redesigned; and if the value of the second temperature value is smaller than the second temperature preset value, gradually reducing the operating frequency of one of the refrigeration hosts until the value of the second temperature value is equal to the value of the second temperature preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310179887.4A CN116105461A (en) | 2023-02-28 | 2023-02-28 | Control system and control method of energy power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310179887.4A CN116105461A (en) | 2023-02-28 | 2023-02-28 | Control system and control method of energy power station |
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| Publication Number | Publication Date |
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| CN116105461A true CN116105461A (en) | 2023-05-12 |
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| CN202310179887.4A Pending CN116105461A (en) | 2023-02-28 | 2023-02-28 | Control system and control method of energy power station |
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| Country | Link |
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| CN (1) | CN116105461A (en) |
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