Control method of multi-energy coupling system and multi-energy coupling system

Abstract

The invention relates to the technical field of heating equipment, and discloses a control method of a multi-energy coupling system and the multi-energy coupling system.The method comprises the steps that a reference load is determined based on the size relation of the water supply temperature of a first system relative to the water supply temperature range of a target system; and the actual boiler operation number and / or the actual heat pump operation number are / is adjusted based on the size relation of the average load relative to the reference load and the current boiler operation number and / or the current heat pump operation number. Under the condition that the gas-fired boiler serves as a main heat source for heat supply, the actual operation number of the gas-fired boiler and the actual operation number of heat pumps are adjusted according to the size relation of the first system water supply temperature relative to the target system water supply temperature range and in combination with the current boiler operation number and / or the current heat pump operation number; when the system water supply temperature is adjusted to be within the target system water supply temperature range, the gas-fired boiler is prevented from running in a high-load or low-load mode for a long time, the service life of the gas-fired boiler is prolonged, and the heat supply efficiency of the gas-fired boiler is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and in particular to a control method of a multi-energy coupling system and a multi-energy coupling system. Background Art

[0002] At present, in order to reduce operating costs and energy consumption for commercial heating or central heating, multiple heat pump units can be coupled with multiple gas boilers for heating. When the ambient temperature is low and the water supply temperature is high, the operation of gas boilers is prioritized. However, when gas boilers are used as the main heat source for heating, some boilers often operate at high load or low load for a long time, which affects the heating efficiency and heating effect of gas boilers. Therefore, there is room for improvement. Summary of the invention

[0003] The first technical problem solved by the present invention is to provide a control method for a multi-energy coupling system, which effectively solves the problem of low heating efficiency and poor heating effect of gas boilers.

[0004] The second technical problem solved by the present invention is to provide a multi-energy coupling system, which effectively solves the problem of low heating efficiency and poor heating effect of gas boilers.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A control method for a multi-energy coupling system, the multi-energy coupling system comprising a gas boiler unit and a heat pump unit for heat exchange through a heat exchanger, the gas boiler unit comprising a plurality of gas boilers arranged in parallel, and the heat pump unit comprising a plurality of heat pumps arranged in parallel; the method comprising:

[0007] Obtaining the first system water supply temperature, and determining a reference load corresponding to the gas boiler based on the relationship between the first system water supply temperature and the target system water supply temperature range;

[0008] Based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current boiler operation quantity and / or the current heat pump operation quantity, the actual boiler operation quantity and / or the actual heat pump operation quantity are adjusted.

[0009] Compared with the background technology, the control method of the multi-energy coupling system described in the present invention has the following beneficial effects: when the gas boiler is used as the main heat source for heating, the present invention determines the corresponding reference load according to the size relationship between the first system water supply temperature of the multi-energy coupling system and the target system water supply temperature range, and combines the current boiler operation number and / or the current heat pump operation number as the basis for adjusting the actual operation number of the gas boiler and the heat pump, so that the multi-energy coupling system can adjust the system water supply temperature to within the target system water supply temperature range, while avoiding the gas boiler from being in high load operation or low load operation for a long time, which not only improves the service life of the gas boiler, but also improves the heating efficiency of the gas boiler and enhances the heating effect of the gas boiler.

[0010] In one embodiment, based on obtaining the first system water supply temperature and based on the relationship between the first system water supply temperature and the target system water supply temperature range, determining the reference load corresponding to the gas boiler includes:

[0011] If the first system water supply temperature is within the target system water supply temperature range, the reference load is determined to include a maximum ideal load and a minimum ideal load; the maximum ideal load is the maximum load corresponding to the expected working state of the gas boiler; the minimum ideal load is the minimum load corresponding to the expected working state of the gas boiler;

[0012] If the first system water supply temperature is less than the minimum system water supply temperature corresponding to the target system water supply temperature range, the reference load is determined to be the maximum working load;

[0013] If the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, the reference load is determined to be the minimum working load.

[0014] In one embodiment, if the first system water supply temperature is within the target system water supply temperature range, then based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation includes:

[0015] If the average load is greater than or equal to the maximum ideal load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain an actual number of boilers in operation;

[0016] If the average load is less than the minimum ideal load, and the current number of boilers in operation is greater than the preset number of boilers in operation, the current number of boilers in operation is reduced by a first preset number to obtain the actual number of boilers in operation.

[0017] In one embodiment, if the first system water supply temperature is less than the minimum system water supply temperature corresponding to the target system water supply temperature range, then based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation includes:

[0018] If the average load is greater than or equal to the maximum working load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain an actual number of boilers in operation;

[0019] If the average load is greater than or equal to the maximum working load, the current number of boiler operations is equal to the maximum number of boiler operations, and the current number of heat pump operations is less than the maximum number of heat pump operations, then the current number of heat pump operations is increased by a second preset number to obtain the actual number of heat pump operations.

[0020] In one embodiment, if the first system water supply temperature is less than the minimum system water supply temperature corresponding to the target system water supply temperature range, then based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, before adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation, the method further includes:

[0021] If the current number of boilers in operation is greater than the minimum number of boilers in operation, and the current boiler water supply temperature is greater than or equal to the target boiler water supply temperature, then the target boiler water supply temperature is increased by a first preset temperature;

[0022] If the current number of boilers in operation is greater than the minimum number of boilers in operation, and the current boiler water supply temperature is less than the target boiler water supply temperature, then the relationship between the average load and the maximum workload is determined.

[0023] In one embodiment, if the first system water supply temperature is less than the minimum system water supply temperature corresponding to the target system water supply temperature range, then based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, before adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation, the method further includes:

[0024] If the current number of boilers in operation is equal to the minimum number of boilers in operation, determining a target boiler water supply temperature based on the sum of the first system water supply temperature and the second preset temperature;

[0025] The current boiler operation quantity is increased by a first preset quantity to obtain the actual boiler operation quantity.

[0026] In one embodiment, if the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, then based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation includes:

[0027] If the current heat pump operation quantity is greater than the minimum heat pump operation quantity, the current heat pump operation quantity is reduced by a second preset quantity to obtain the actual heat pump operation quantity;

[0028] If the current number of heat pump operations is equal to the minimum number of heat pump operations, the average load is less than or equal to the minimum workload, and the current number of boiler operations is greater than the minimum number of boiler operations, the current number of boiler operations is reduced by a first preset number to obtain an actual number of boiler operations.

[0029] In one embodiment, if the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, the method further includes:

[0030] If the current number of heat pump operations is equal to the minimum number of heat pump operations, the average load is greater than the minimum working load, and the current number of boiler operations is greater than the minimum number of boiler operations, the target boiler water supply temperature is reduced by a first preset temperature.

[0031] In one embodiment, based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, after adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation, the method further includes:

[0032] Based on the actual number of boilers in operation and the actual number of heat pumps in operation, control the preset operation time of the multi-energy coupling system;

[0033] Obtaining a second system water supply temperature, and determining a reference load based on a magnitude relationship between the second system water supply temperature and a target system water supply temperature range;

[0034] Based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current boiler operation quantity and / or the current heat pump operation quantity, the actual boiler operation quantity and / or the actual heat pump operation quantity are adjusted.

[0035] The above second technical problem is solved by the following technical solution:

[0036] A multi-energy coupling system, comprising:

[0037] Gas boiler units and heat pump units that perform heat exchange through heat exchangers; the gas boiler unit includes multiple gas boilers arranged in parallel; the heat pump unit includes multiple heat pumps arranged in parallel;

[0038] And, a controller, the controller is used to execute any control method of the multi-energy coupling system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a structural schematic diagram of a multi-energy coupling system according to an embodiment of the present invention;

[0041] Figure 2 is a flow chart of a control method for a multi-energy coupling system according to an embodiment of the present invention;

[0042] Figure 3 It is a flow chart of adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation when the water supply temperature of the first system is within the target system water supply temperature range in a control method of a multi-energy coupling system according to an embodiment of the present invention;

[0043] Figure 4 It is a flowchart of a specific embodiment of a control method for a multi-energy coupling system according to an embodiment of the present invention;

[0044] Figure 5 It is a flow chart of adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation when the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range in a control method for a multi-energy coupling system according to an embodiment of the present invention;

[0045] Figure 6 It is a flow chart of adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation when the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range in a control method for a multi-energy coupling system in an embodiment of the present invention;

[0046] Figure 7 It is a flow chart of a control method of an energy coupling system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] As described in the background technology, when gas boilers are used as the main heat source for heating, some boilers often operate at high load or low load for a long time, which affects the heating efficiency and heating effect of the gas boiler. When the gas boiler is operating at high load, the heating efficiency of the gas boiler will decrease and the life of the heat exchanger will also be shortened; when the gas boiler is at low load, the burner flame is very short and unevenly distributed, resulting in reduced flame stability, easy to generate combustion noise, and also shorten the burner life.

[0050] Based on this, an embodiment of the present invention provides a control method for a multi-energy coupling system. When a gas boiler is used as a main heat source for heating, a corresponding reference load is determined according to a size relationship between a first system water supply temperature of the multi-energy coupling system and a target system water supply temperature range, and the current number of boiler operations and / or the current number of heat pump operations are used together as a basis for adjusting the actual number of gas boilers and heat pumps in operation, so that the multi-energy coupling system can adjust the system water supply temperature to within the target system water supply temperature range while avoiding the gas boiler from being in high-load operation or low-load operation for a long time, which not only improves the service life of the gas boiler, but also improves the heating efficiency of the gas boiler and enhances the heating effect of the gas boiler.

[0051] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0052] According to an embodiment of the present invention, on the one hand, a multi-energy coupling system is provided. Figure 1 is a schematic diagram of a multi-energy coupling system according to an embodiment of the present invention. Figure 1As shown, the multi-energy coupling system includes: a gas boiler unit and a heat pump unit for heat exchange through a heat exchanger, and a controller; wherein the gas boiler unit includes a plurality of gas boilers arranged in parallel, and the heat pump unit includes a plurality of heat pumps arranged in parallel. The controller is used to execute the control method of the multi-energy coupling system, so as to control the load of the gas boiler within a reasonable range, avoid the gas boiler from operating at high load or low load, improve the heating efficiency of the gas boiler, and enhance the heating effect of the gas boiler.

[0053] According to an embodiment of the present invention, on the other hand, a control method for a multi-energy coupling system is provided, and the method is applied to the multi-energy coupling system as described above. It should be noted that the method is mainly applied to a boiler-priority working mode, that is, a working mode in which a gas boiler is used for heating first; the working mode can be applied to low ambient temperature or high outlet water temperature, and can also be applied to a situation where the overall operating cost of the heat pump is higher than that of the gas boiler under high electricity price conditions due to the low energy efficiency of the heat pump. Figure 2 is a flow chart of a control method for a multi-energy coupling system according to an embodiment of the present invention. Figure 2 As shown, the method may include the following steps:

[0054] Step 210: Obtain the first system water supply temperature, and determine the reference load corresponding to the gas boiler based on the relationship between the first system water supply temperature and the target system water supply temperature range.

[0055] In the embodiment of the present invention, the first system water supply temperature is the water supply temperature of the current multi-energy coupling system, that is, the water supply temperature outputted by the gas boiler and the heat pump as a whole.

[0056] In the embodiment of the present invention, the target system water supply temperature range is a temperature range based on the target system water supply temperature, and its specific range is a temperature range corresponding to a deviation temperature above and below the target system water supply temperature. The target system water supply temperature is the target water supply temperature set by the user, and the deviation temperature is an acceptable temperature fluctuation value; considering that even if the system outputs stable water supply, the system water supply temperature will still fluctuate within a small range, the target system water supply temperature range is used as a measure to avoid misjudgment of the first system water supply temperature.

[0057] In the embodiment of the present invention, according to the relationship between the water supply temperature of the first system and the water supply temperature range of the target system, the working state of the multi-energy coupling system can be divided into three types, corresponding to different reference loads of gas boilers; at the same time, different working states, or different reference loads, also correspond to different adjustment bases and logics. Therefore, according to the water supply temperature of the current system, different adjustment bases and logics are adopted to adjust the number of gas boilers and heat pumps in operation in the system, adjust the water supply temperature of the system to within the water supply temperature range of the target system, and make the system work stably to meet the heating needs of users and improve the heating comfort of users.

[0058] Specifically, if the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, the working state of the multi-energy coupling system is a low temperature state; if the first system water supply temperature is within the target system water supply temperature range, the working state of the multi-energy coupling system is a stable state; if the first system water supply temperature is higher than the maximum system water supply temperature corresponding to the target system water supply temperature range, the working state of the multi-energy coupling system is a high temperature state.

[0059] In one embodiment, if the first system water supply temperature is within the target system water supply temperature range, that is, the working state of the multi-energy coupling system is stable, the load value or load interval corresponding to the gas boiler when it is running at normal load can be used as a reference load to maintain the average load of the gas boiler within the load interval corresponding to the normal load; wherein the normal load is a load that can ensure the stability of the boiler flame based on information such as user needs, the design of the gas boiler, and historical experience data. Optionally, since the normal load has a boundary load corresponding to low load and high load respectively, two reference loads can be set, corresponding to the boundary load of low load and the boundary load of high load, respectively, so as to limit the average load to the load interval corresponding to the normal load.

[0060] In one embodiment, if the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, that is, the working state of the multi-energy coupling system is a low temperature state, then the load value or load range corresponding to the gas boiler when operating at a low load can be used as a reference load, so that when the average load of the gas boiler falls into the range corresponding to the reference load, the corresponding adjustment basis and logic are adopted to adjust the average load back to the load range corresponding to the normal load.

[0061] In one embodiment, if the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, that is, the working state of the multi-energy coupling system is a high temperature state, then the load value or load range corresponding to the gas boiler when operating at high load can be used as a reference load, so that when the average load of the gas boiler falls into the range corresponding to the reference load, the corresponding adjustment basis and logic are adopted to adjust the average load back to the load range corresponding to the normal load.

[0062] Step 220: Based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, adjust the actual number of boilers in operation and / or the actual number of heat pumps in operation.

[0063] In the embodiment of the present invention, the current average load of the gas boiler refers to the average load of the gas boilers currently in operation in the gas boiler unit, and the gas boilers that are not in operation are not included. The current number of boilers in operation is the current number of gas boilers in operation, and the current number of heat pumps in operation is the current number of heat pumps in operation; the actual number of boilers in operation is the actual number of gas boilers in operation, and the actual number of heat pumps in operation is the actual number of heat pumps in operation, wherein the current number of operations is the number of gas boilers or heat pumps in operation at the current situation; the actual number of operations is the number of gas boilers or heat pumps that actually need to be operated.

[0064] In an embodiment of the present invention, based on the adjustment basis and logic corresponding to the reference load, combined with the size relationship of the average load relative to the reference load and the current number of boilers in operation and / or the current number of heat pumps in operation, an adjustment strategy for the actual number of boilers in operation and / or the actual number of heat pumps in operation is determined. When the average load of the gas boiler is relatively small, the actual number of boilers in operation or the actual number of heat pumps in operation is reduced to increase the average load of the gas boiler. When the average load of the gas boiler is relatively large, the actual number of gas boilers in operation or the actual number of heat pumps in operation is increased to reduce the average load of the gas boiler, thereby stabilizing the average load of the gas boiler within the load range corresponding to the normal load, thereby avoiding the gas boiler from being in high load operation or low load operation.

[0065] In a specific embodiment, in the above step 210, the following loads may be used as reference loads in various working states. It should be noted that only one example of selecting a reference load is shown in this embodiment, and other loads may also be used as reference loads in actual applications, and no specific limitation is made here.

[0066] Specifically, if the water supply temperature of the first system is within the target system water supply temperature range, that is, the working state of the multi-energy coupling system is a stable state, then it can be determined that the reference load includes the maximum ideal load and the minimum ideal load. Among them, the expected working state is a working state corresponding to the flame stability of the gas boiler and the heating efficiency maintained within a higher efficiency range. The maximum ideal load is the maximum load corresponding to the expected working state of the gas boiler, corresponding to the boundary load between normal load and high load; the minimum ideal load is the minimum load corresponding to the expected working state of the gas boiler, corresponding to the boundary load between normal load and low load; optionally, the maximum ideal load can be the rated load of the gas boiler.

[0067] If the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, that is, the working state of the multi-energy coupling system is a low temperature state, then the reference load is determined to be the maximum workload. The specific size of the maximum workload can be adjusted according to user needs.

[0068] If the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, that is, the working state of the multi-energy coupling system is a high temperature state, then the reference load is determined to be the minimum workload. The specific size of the minimum workload can be adjusted according to user needs.

[0069] In a specific embodiment, the maximum ideal load can be selected as a value between 85% and 95%, and the minimum ideal load can be selected as a value between 25% and 35%; the maximum workload can be selected as a value between 95% and 100%, and the minimum workload can be selected as a value between 20% and 35%. It should be noted that the maximum ideal load is generally less than the maximum workload, and the minimum ideal load is generally less than the minimum workload. In a preferred embodiment, the maximum ideal load is less than the maximum workload, and the minimum ideal load is less than the minimum workload.

[0070] In one embodiment, corresponding to the different reference loads obtained in step 210, the basis and logic for adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation in step 220 can be divided into the following situations.

[0071] Specifically, in the first case, the water supply temperature of the first system is within the target system water supply temperature range, and the working state of the multi-energy coupling system is a stable state; at this time, the reference load includes the boundary loads of normal load and high load, normal load and low load, and specifically can include the maximum ideal load and the minimum ideal load. Figure 3 1 is a flow chart of adjusting the actual number of boiler operations and / or the actual number of heat pump operations when the first system water supply temperature is within the target system water supply temperature range in a control method for a multi-energy coupling system according to an embodiment of the present invention, such as Figure 3 As shown, at this time, step 220 includes:

[0072] Step 310: If the average load is greater than or equal to the maximum ideal load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain an actual number of boilers in operation.

[0073] In the embodiment of the present invention, if the average load is greater than or equal to the maximum ideal load, it indicates that the gas boiler is in high load operation at this time, so it is necessary to increase the number of gas boilers to reduce the load of the gas boilers so that the load of the gas boilers returns to the normal load range. At the same time, it is determined whether the number of gas boilers in operation can continue to increase according to the current number of boilers in operation; when the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation, so that the gas boiler unit operates according to the actual number of boilers in operation; when the current number of boilers in operation is equal to the maximum number of boilers in operation, the number of gas boilers in operation cannot be increased further, so the current number of boilers in operation is used as the actual number of boilers in operation.

[0074] Step 320: If the average load is less than the minimum ideal load, and the current number of boilers in operation is greater than the preset number of boilers in operation, the current number of boilers in operation is reduced by a first preset number to obtain the actual number of boilers in operation.

[0075] In the embodiment of the present invention, if the average load is less than the minimum ideal load, it indicates that the gas boiler is in low load operation at this time, so it is necessary to reduce the number of gas boilers to increase the load of the gas boilers so that the load of the gas boilers returns to the normal load range. At the same time, it is determined whether the number of gas boilers in operation can continue to be reduced according to the current number of boilers in operation; since the multi-energy coupling system adopts a boiler priority working mode, at least one gas boiler needs to be operated in the gas boiler unit to ensure that the multi-energy coupling system is in operation, so the preset number of boilers in operation can be set to a value greater than or equal to the first preset number. When the current number of boilers in operation is greater than the preset number of boilers in operation, the current number of boilers in operation is reduced by the first preset number to obtain the actual number of boilers in operation; when the current number of boilers in operation is less than or equal to the preset number of boilers in operation, in order to ensure that the multi-energy coupling system is in operation, the number of gas boilers in operation is not adjusted, that is, the current number of boilers in operation is used as the actual number of boilers in operation.

[0076] In an embodiment of the present invention, if the average load is between the minimum ideal load and the maximum ideal load, it indicates that the gas boiler is in normal load operation at this time, and there is no need to adjust the operating number of the gas boiler or the heat pump, so the current boiler operating number is used as the actual boiler operating number.

[0077] In a specific embodiment, the first preset number may be 1, and the preset boiler operation number is a number greater than or equal to 1, such as 1 or 2.

[0078] In a specific embodiment, Figure 4 FIG. 1 is a flow chart of a specific embodiment of a control method for a multi-energy coupling system according to an embodiment of the present invention. Figure 4 As shown, the target system water supply temperature is T, the deviation temperature is t1, then the target system water supply temperature range is between T-t1 and T+t1; the first system water supply temperature is T1. When the first system water supply temperature T1 is between the target system water supply temperature range T-t1 and T+t1, first determine whether all gas boilers are shut down.

[0079] If all gas boilers are turned off, it means that the multi-energy coupling system is not in the boiler priority working mode at this time. The multi-energy coupling system can meet the water supply temperature requirement by relying on the heat pump unit for heating, so no adjustment is made to the gas boiler; if the gas boiler is turned on, it is further determined whether the average load of the gas boiler is greater than or equal to the maximum ideal load S%.

[0080] If the average load is greater than or equal to the maximum ideal load S%, it is further determined whether all gas boilers are turned on, that is, whether the current number of boilers in operation is less than the maximum number of boilers in operation. If the current number of boilers in operation is less than the maximum number of boilers in operation, an additional gas boiler is turned on, that is, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation; if the current number of boilers in operation is equal to the maximum number of boilers in operation, the status quo is maintained and the operation is continued, that is, the current number of boilers in operation is taken as the actual number of boilers in operation.

[0081] If the average load is less than the maximum ideal load S%, it is further determined whether the average load is less than the minimum ideal load I%. If the average load is less than or equal to the minimum ideal load I%, it is further determined whether the current number of boilers in operation is greater than or equal to 2; if the current number of boilers in operation is greater than or equal to 2, one gas boiler is shut down, that is, the current number of boilers in operation is reduced by a first preset number to obtain the actual number of boilers in operation; if the current number of boilers in operation is less than 2, the status quo is maintained and the operation is continued, that is, the current number of boilers in operation is taken as the actual number of boilers in operation.

[0082] If the average load is greater than the minimum ideal load 1%, the current operation is maintained, that is, the current number of boilers in operation is regarded as the actual number of boilers in operation.

[0083] In the second case, the water supply temperature of the first system is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, and the working state of the multi-energy coupling system is a low temperature state; at this time, the reference load is the load corresponding to the load, specifically, the maximum working load. Figure 51 is a flow chart of adjusting the actual number of boiler operations and / or the actual number of heat pump operations when the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range in a control method for a multi-energy coupling system according to an embodiment of the present invention, such as Figure 5 As shown, at this time, step 220 includes:

[0084] Step 510: If the average load is greater than or equal to the maximum working load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation.

[0085] In the embodiment of the present invention, if the average load is greater than or equal to the maximum working load, it indicates that the gas boiler is in high load operation at this time, so it is necessary to increase the number of gas boilers to reduce the load of the gas boilers so that the load of the gas boilers returns to the normal load range. At the same time, it is determined whether the number of gas boilers in operation can continue to increase according to the current number of boilers in operation; when the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation, so that the gas boiler unit operates according to the actual number of boilers in operation.

[0086] Step 520: If the average load is greater than or equal to the maximum working load, the current boiler operation number is equal to the maximum boiler operation number, and the current heat pump operation number is less than the maximum heat pump operation number, then the current heat pump operation number is increased by a second preset number to obtain the actual heat pump operation number.

[0087] In the embodiment of the present invention, if the average load is greater than or equal to the maximum working load, and the current number of boilers in operation is equal to the maximum number of boilers in operation, it indicates that the current number of gas boilers in operation has reached the upper limit, and at this time the water supply temperature of the first system is still lower than the minimum system water supply temperature, so it is necessary to increase the number of heat pumps in operation to increase the water supply temperature of the multi-energy coupling system. At this time, it is further determined whether the current heat pump unit is turned on, and whether the current number of heat pumps in operation is less than the maximum number of heat pumps in operation; when the current heat pump unit is not turned on and the current number of heat pumps in operation is less than the maximum number of heat pumps in operation, the current number of heat pumps in operation is increased by the second preset number to obtain the actual number of heat pumps in operation.

[0088] In the embodiment of the present invention, if the average load is greater than or equal to the maximum workload, and the current number of boilers in operation is equal to the maximum number of boilers in operation, and the current number of heat pumps in operation is equal to the maximum number of heat pumps in operation, it indicates that all available energy devices in the multi-energy coupling system are already in operation, so the status quo is maintained and the operation continues.

[0089] In the embodiment of the present invention, if the average load is less than the maximum working load, it indicates that the gas boiler is currently operating at normal load, and the average load of the gas boiler can continue to increase, which can also continue to increase the water supply temperature of the multi-energy coupling system, so the status quo is maintained and the operation continues.

[0090] In one embodiment, since the first system water supply temperature is lower than the minimum system water supply temperature in the second case, it is necessary to adjust not only the average load of the gas boiler, but also the water supply temperature of the multi-energy coupling system. Accordingly, before determining the magnitude relationship between the average load and the maximum working load, it is also determined whether the current boiler water supply temperature meets the target boiler water supply temperature. Specifically, depending on whether there is a gas boiler in operation, it is divided into the following two situations:

[0091] In the first case, there are gas boilers running at present, that is, the current number of boilers running is greater than the minimum number of boilers running. At this time, different adjustment strategies are adopted according to the size relationship between the current boiler water supply temperature and the target boiler water supply temperature. Specifically, if the current number of boilers running is greater than the minimum number of boilers running, and the current boiler water supply temperature is greater than or equal to the target boiler water supply temperature, it indicates that the heating demand of the target system water supply temperature cannot be met according to the currently set target boiler water supply temperature, so the target boiler water supply temperature is increased by the first preset temperature; wherein the first preset temperature is a pre-set temperature value for adjusting the target boiler water supply temperature once. If the current number of boilers running is greater than the minimum number of boilers running, and the current boiler water supply temperature is less than the target boiler water supply temperature, it indicates that the heating of the current gas boiler has not yet reached the requirements of the currently set target boiler water supply temperature, and its load needs to continue to increase to increase the current boiler water supply temperature. At this time, the size relationship between the average load and the maximum working load is judged to perform the above steps 510-520 to adjust the number of gas boilers and / or heat pumps running.

[0092] In the second case, all gas boilers are currently shut down, that is, if the current number of boilers in operation is equal to the minimum number of boilers in operation, the target boiler water supply temperature is determined based on the sum of the first system water supply temperature and the second preset temperature; the current number of boilers in operation is increased by the first preset number to obtain the actual number of boilers in operation. This process is actually the process of starting and initializing the gas boiler, that is, starting the gas boiler and setting its corresponding target water supply temperature. Among them, the second preset temperature is the plate exchanger temperature difference; the sum of the first system water supply temperature and the second preset temperature is used as the target boiler water supply temperature, so that the water supply temperature provided by the gas boiler can reach the target system water supply temperature after the plate exchanger.

[0093] In a specific embodiment, the second preset number may be 1; the plate temperature difference, ie, the second preset temperature, may be a temperature value between 5°C and 10°C.

[0094] In a specific embodiment, Figure 4 As shown, when the first system water supply temperature T1 is less than the minimum system water supply temperature T-t1, it is first determined whether all current gas boilers are shut down, that is, whether the current number of boilers in operation is equal to the minimum number of boilers in operation.

[0095] If the current number of operating boilers is equal to the minimum number of operating boilers, that is, whether all current gas boilers are shut down, the sum of the first system water supply temperature T and the plate exchanger temperature difference t3 is used as the target boiler water supply temperature T2, and an additional gas boiler is opened at the same time.

[0096] If the current number of boilers in operation is greater than the minimum number of boilers in operation, that is, there is a gas boiler in operation, then the relationship between the current boiler water supply temperature T3 and the target boiler water supply temperature T2 is further determined. If the current boiler water supply temperature T3 is greater than the target boiler water supply temperature T2, then the first preset temperature t2 is increased based on the current target boiler water supply temperature T2.

[0097] If the current boiler water supply temperature T3 is lower than the target boiler water supply temperature T2, it is further determined whether the average load of the gas boiler is greater than or equal to the maximum workload H%. If the average load is lower than the maximum workload H%, the status quo is maintained and the operation continues.

[0098] If the average load is greater than or equal to the maximum working load H%, it is further determined whether all gas boilers are turned on, that is, whether the current number of boilers in operation is less than the maximum number of boilers in operation. If the current number of boilers in operation is less than the maximum number of boilers in operation, an additional gas boiler is turned on, that is, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation; if the current number of boilers in operation is equal to the maximum number of boilers in operation, it is further determined whether the heat pump unit is turned on.

[0099] If the heat pump unit has not been turned on, turn on the heat pump unit and start the compressor of one heat pump; if the heat pump unit has been turned on, further determine whether the current number of heat pumps in operation is equal to the maximum number of heat pumps in operation. If the current number of heat pumps in operation is less than the maximum number of heat pumps in operation, add a heat pump compressor; if the current number of heat pumps in operation is equal to the maximum number of heat pumps in operation, maintain the status quo and continue to operate.

[0100] In the third case, the water supply temperature of the first system is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, and the working state of the multi-energy coupling system is a high temperature state; at this time, the reference load is the load corresponding to the low load, specifically, the minimum working load. Figure 61 is a flow chart of adjusting the actual number of boiler operations and / or the actual number of heat pump operations when the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range in a control method for a multi-energy coupling system in an embodiment of the present invention, such as Figure 6 As shown, at this time, step 220 includes:

[0101] Step 610: If the current heat pump operating number is greater than the minimum heat pump operating number, the current heat pump operating number is reduced by a second preset number to obtain the actual heat pump operating number.

[0102] In the embodiment of the present invention, if the current number of heat pumps in operation is greater than the minimum number of heat pumps in operation, it indicates that a heat pump is in operation at this time. Since the multi-energy coupling system adopts a boiler-priority working mode, the running heat pump can be turned off first. On the one hand, the excessively high first system water supply temperature is reduced. On the other hand, if the average load of the gas boiler is too low, that is, the average load is less than or equal to the minimum working load, the average load of the gas boiler can be increased to increase the load of the gas boiler and return the load of the gas boiler to the normal load range. Based on this, the current number of heat pumps in operation is reduced by the second preset number at this time to obtain the actual number of heat pumps in operation.

[0103] Step 620: If the current number of heat pump operations is equal to the minimum number of heat pump operations, the average load is less than or equal to the minimum working load, and the current number of boiler operations is greater than the minimum number of boiler operations, then the current number of boiler operations is reduced by a first preset number to obtain the actual number of boiler operations.

[0104] In an embodiment of the present invention, if the current number of heat pumps in operation is equal to the minimum number of heat pumps in operation, the average load is less than or equal to the minimum working load, and the current number of boilers in operation is greater than the minimum number of boilers in operation, it indicates that only the gas boilers are in operation in the multi-energy coupling system at this time, and the current number of boilers in operation is large, resulting in the average load being less than or equal to the minimum working load and the gas boilers being in low-load operation. Therefore, at this time, the current number of boilers in operation can be reduced by a first preset number to obtain the actual number of boilers in operation.

[0105] In the embodiment of the present invention, if the current number of heat pumps in operation is equal to the minimum number of heat pumps in operation, the average load is less than or equal to the minimum working load, and the current number of boilers in operation is equal to the minimum number of boilers in operation, it indicates that all energy devices in the multi-energy coupling system are turned off at this time, and the multi-energy coupling system can also make the first system water supply temperature exceed the maximum system water supply temperature by relying on waste heat heating. Therefore, no adjustment is made to the number of gas boilers and heat pumps in operation, and the status quo is maintained and operation continues.

[0106] In one embodiment, if the current number of heat pump operations is equal to the minimum number of heat pump operations, the average load is greater than the minimum working load, and the current number of boiler operations is greater than the minimum number of boiler operations, it indicates that the gas boiler is in normal load operation at this time and there is no need to adjust the number of gas boiler operations. At this time, the target boiler water supply temperature is reduced by a first preset temperature to reduce the first system water supply temperature.

[0107] In a specific embodiment, Figure 4 As shown, when the first system water supply temperature T1 is greater than the maximum system water supply temperature T+t1, first determine whether all current heat pumps are shut down, that is, determine whether the current number of heat pumps in operation is equal to the minimum number of heat pumps in operation. If the current number of heat pumps in operation is greater than the minimum number of heat pumps in operation, shut down the compressor of one heat pump.

[0108] If the current number of heat pumps in operation is equal to the minimum number of heat pumps in operation, then further determine whether all the current gas boilers are shut down, that is, determine whether the current number of boilers in operation is equal to the minimum number of boilers in operation. If the current number of boilers in operation is equal to the minimum number of boilers in operation, then maintain the status quo and continue to operate. If the current number of boilers in operation is greater than the minimum number of boilers in operation, then further determine whether the average load of the gas boiler is less than or equal to the minimum working load L%.

[0109] If the average load of the gas boiler is less than or equal to the minimum workload L%, one gas boiler is shut down; if the average load of the gas boiler is greater than the minimum workload L%, the first preset temperature t2 is increased based on the current target boiler water supply temperature T2.

[0110] In one embodiment, after the actual number of boilers in operation and / or the actual number of heat pumps are controlled according to the control logic described above, the preset time is continued, and after the water supply temperature of the multi-energy coupling system is stabilized within a certain temperature range, the actual number of boilers in operation and / or the actual number of heat pumps are continued to be controlled according to the control logic described above. Thus, the continuous monitoring and adjustment of the water supply temperature of the multi-energy coupling system and the continuous monitoring and adjustment of the load of the gas boiler are achieved. Specifically, Figure 7 is a flow chart of a control method of an energy coupling system according to an embodiment of the present invention. Figure 7 As shown, after the above step 220, the following steps may also be included:

[0111] Step 710: Based on the actual number of boilers in operation and the actual number of heat pumps in operation, control the multi-energy coupling system to operate for a preset time.

[0112] Step 720: Obtain the second system water supply temperature, and determine the reference load based on the relationship between the second system water supply temperature and the target system water supply temperature range.

[0113] Step 730: Based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, adjust the actual number of boilers in operation and / or the actual number of heat pumps in operation.

[0114] Among them, in step 720, the second system water supply temperature is the water supply temperature of the multi-energy coupling system after step 710, that is, after the actual number of boilers in operation and the actual number of heat pumps in operation are adjusted and run for a preset time, the first system water supply temperature is updated to obtain the second system water supply temperature. Steps 720 to 730 are consistent with the above steps 210 to 220, and are not repeated here.

[0115] The control method of the multi-energy coupling system provided by the embodiment of the present invention determines the corresponding reference load according to the size relationship between the first system water supply temperature of the multi-energy coupling system and the target system water supply temperature range when the gas boiler is used as the main heat source for heating, and combines the current number of boiler operations and / or the current number of heat pump operations as the basis for adjusting the actual number of gas boilers and heat pumps, so that the multi-energy coupling system can adjust the system water supply temperature to within the target system water supply temperature range, while avoiding the gas boiler from being in high-load operation or low-load operation for a long time, which not only improves the service life of the gas boiler, but also improves the heating efficiency of the gas boiler and enhances the heating effect of the gas boiler.

[0116] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The specific contents of the above specific implementations only express several implementations of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A control method for a multi-energy coupling system, characterized in that: The multi-energy coupling system comprises a gas boiler unit and a heat pump unit for heat exchange through a heat exchanger, wherein the gas boiler unit comprises a plurality of gas boilers arranged in parallel, and the heat pump unit comprises a plurality of heat pumps arranged in parallel; the method comprises: Acquire the first system water supply temperature, and determine the reference load corresponding to the gas boiler based on the relationship between the first system water supply temperature and the target system water supply temperature range; Based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, the actual number of boilers in operation and / or the actual number of heat pumps in operation are adjusted.

2. The method according to claim 1, characterized in that The step of determining a reference load corresponding to the gas boiler based on the acquired first system water supply temperature and based on a magnitude relationship between the first system water supply temperature and a target system water supply temperature range includes: If the first system water supply temperature is within the target system water supply temperature range, the reference load is determined to include a maximum ideal load and a minimum ideal load; the maximum ideal load is the maximum load corresponding to the expected working state of the gas boiler; the minimum ideal load is the minimum load corresponding to the expected working state of the gas boiler; If the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, determining the reference load as the maximum workload; If the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, the reference load is determined to be the minimum working load.

3. The method according to claim 2, characterized in that If the first system water supply temperature is within the target system water supply temperature range, then adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation based on the magnitude relationship of the current average load of the gas boiler relative to the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, comprises: If the average load is greater than or equal to the maximum ideal load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation; If the average load is less than the minimum ideal load, and the current number of boilers in operation is greater than the preset number of boilers in operation, the current number of boilers in operation is reduced by the first preset number to obtain the actual number of boilers in operation.

4. The method according to claim 2, characterized in that: If the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, then adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, includes: If the average load is greater than or equal to the maximum working load, and the current number of boilers in operation is less than the maximum number of boilers in operation, the current number of boilers in operation is increased by a first preset number to obtain the actual number of boilers in operation; If the average load is greater than or equal to the maximum working load, the current boiler operating number is equal to the maximum boiler operating number, and the current heat pump operating number is less than the maximum heat pump operating number, then the current heat pump operating number is increased by a second preset number to obtain the actual heat pump operating number.

5. The method according to claim 4, characterized in that If the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, the adjusting of the actual number of boiler operations and / or the actual number of heat pump operations based on the current average load of the gas boiler relative to the reference load, and the current number of boiler operations and / or the current number of heat pump operations also includes: If the current number of boilers in operation is greater than the minimum number of boilers in operation, and the current boiler water supply temperature is greater than or equal to the target boiler water supply temperature, increasing the target boiler water supply temperature by a first preset temperature; If the current number of boilers in operation is greater than the minimum number of boilers in operation, and the current boiler water supply temperature is less than the target boiler water supply temperature, then the magnitude relationship of the average load relative to the maximum workload is determined.

6. The method according to claim 4, characterized in that If the first system water supply temperature is lower than the minimum system water supply temperature corresponding to the target system water supply temperature range, the adjusting of the actual number of boiler operations and / or the actual number of heat pump operations based on the current average load of the gas boiler relative to the reference load, and the current number of boiler operations and / or the current number of heat pump operations also includes: If the current number of boilers in operation is equal to the minimum number of boilers in operation, determining a target boiler water supply temperature based on the sum of the first system water supply temperature and a second preset temperature; The current boiler operation number is increased by the first preset number to obtain the actual boiler operation number.

7. The method according to claim 2, characterized in that If the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, then adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation based on the relationship between the current average load of the gas boiler and the reference load, and the current number of boilers in operation and / or the current number of heat pumps in operation, includes: If the current heat pump operation quantity is greater than the minimum heat pump operation quantity, reducing the current heat pump operation quantity by a second preset quantity to obtain the actual heat pump operation quantity; If the current heat pump operating number is equal to the minimum heat pump operating number, the average load is less than or equal to the minimum working load, and the current boiler operating number is greater than the minimum boiler operating number, then the current boiler operating number is reduced by a first preset number to obtain the actual boiler operating number.

8. The method according to claim 7, characterized in that If the first system water supply temperature is greater than the maximum system water supply temperature corresponding to the target system water supply temperature range, the method further includes: If the current heat pump operation number is equal to the minimum heat pump operation number, the average load is greater than the minimum working load, and the current boiler operation number is greater than the minimum boiler operation number, the target boiler water supply temperature is reduced by a first preset temperature.

9. The method according to any one of claims 1 to 8, characterized in that: After adjusting the actual number of boilers in operation and / or the actual number of heat pumps in operation based on the magnitude relationship between the current average load of the gas boiler and the reference load and the current number of boilers in operation and / or the current number of heat pumps in operation, the method further includes: Based on the actual number of boilers in operation and the actual number of heat pumps in operation, controlling the preset operation time of the multi-energy coupling system; Acquire the second system water supply temperature, and determine the reference load based on the magnitude relationship of the second system water supply temperature relative to the target system water supply temperature range; Based on the magnitude relationship between the current average load of the gas boiler and the reference load, and the current number of boiler operations and / or the current number of heat pump operations, the actual number of boiler operations and / or the actual number of heat pump operations are adjusted.

10. A multi-energy coupling system, characterized in that: include: A gas boiler unit and a heat pump unit that perform heat exchange through a heat exchanger; the gas boiler unit comprises a plurality of gas boilers arranged in parallel; the heat pump unit comprises a plurality of heat pumps arranged in parallel; And, a controller, wherein the controller is used to execute the control method of the multi-energy coupling system as described in any one of claims 1-9.

Images