CN-122015212-A - Dual-energy coupled cross-region collaborative cooling and heating system and flexible control method

CN122015212ACN 122015212 ACN122015212 ACN 122015212ACN-122015212-A

Abstract

The invention relates to the technical field of heating ventilation air conditioning and regional energy systems, in particular to a dual-energy-coupled cross-region collaborative cooling and heating system and a flexible control method; the system comprises a heat pump unit serving two independent areas, an electrode boiler auxiliary heat source unit, a variable-frequency circulating water system, a valve system and a flexible control system, wherein part of heat pump units are designed to be capable of being switched in a cross-region mode, energy complementation between the two areas is achieved, and the flexible control method comprises five levels, namely, self-adaptive variable-frequency adjustment of a single heat pump based on load and temperature deviation, time sequence cooperative operation of a plurality of heat pumps and circulating pumps in the areas, dual-energy coupling and intelligent switching of the heat pumps and the electrode boilers based on environmental temperature and heat pump energy efficiency, and cross-region cooperative energy supply scheduling follows the principle of priority and cross-region complementation of the area and a safe redundancy and fault rapid switching mechanism under abnormal conditions. According to the invention, the energy efficiency optimization and the load balancing of the energy supply system are realized through intelligent prediction, dynamic matching and multi-energy coordination.

Inventors

JIANG HAIFENG
WANG ZONGLIN
WANG LIGANG
LIU JIYANG
WANG HONGYAN

Assignees

北京锦华综合能源有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (9)

1. A dual-energy coupled cross-region collaborative cooling and heating flexible control method is characterized by comprising the following specific implementation steps: S1, based on the instantaneous power of each heat pump unit and the deviation between the indoor temperature of a service area and a set value, the rotation speed of a compressor of each heat pump unit is regulated in stages, high-frequency operation is adopted when the load ascends, medium-low frequency operation is adopted when the load is stable, the deep energy-saving mode can be entered when the load is continuous and stable, the frequency is gradually reduced to stop when the load descends, and the rotation speed compensation is carried out according to the extreme environmental temperature in winter and summer; S2, taking the total load change rate of the area exceeding the set amplitude as a trigger signal, and cooperatively controlling the start and stop of a plurality of heat pumps in the area and the speed regulation of the circulating pump, wherein the circulating pump carries out closed-loop regulation based on the pressure difference and the flow of water supply and return and is cooperated with the regulation maintaining time sequence of the heat pump, and the method comprises the steps of advancing the speed of the circulating pump before the speed of the compressor of the heat pump is increased, delaying the speed of the circulating pump after the speed of the compressor of the heat pump is reduced, and maintaining the speed of the circulating pump to be stable during the acceleration and deceleration of the heat pump; S3, under a heat supply mode, the heat pump is used as a main heat source in a slight low-temperature section and the boiler is used for peak shaving, and the boiler is used as a main heat source in a deep low-temperature section and the heat pump is used for low-load bottom protection operation; S4, according to the principle of regional priority and regional supplement, triggering regional support only after all available heat pumps in the region are fully loaded, and switching the switchable heat pump in the other region into a demand region pipe network through valve switching of a circulation system, and uniformly scheduling the demand region; S5, in a cooling mode, when a single heat pump fails, the rotation speed of compressors of other units in a zone is preferentially increased, when the power is insufficient, cross-zone coordination is triggered, in a heating mode, when the single heat pump fails, the power of other units in the zone is preferentially increased, when the power is insufficient, cross-zone coordination is triggered, or boilers are started, when the cross-zone coordination fails, the rotation speed of compressors of local units is increased, the boilers are ready for replenishment, and when the single boiler fails, the other boiler is started to run in a full load mode, and the heating intensity of a non-core zone is adjusted.
2. The dual-energy coupled cross-zone collaborative cooling and heating flexible control method according to claim 1, wherein in step S1, the staged adjustment specifically comprises: When the instantaneous load rate exceeds 60% or the indoor temperature deviation is more than or equal to 2 ℃, controlling the compressor to start at a rated rotation speed of 80-100%; When the instantaneous load rate is stable in the interval of 30-50%, controlling the compressor to operate at the rated rotation speed of 30-50%, and entering a deep energy-saving mode after the state is continuously set for a time, and further regulating the rotation speed to the rated rotation speed of 25-35%; in the refrigerating mode, when the instantaneous load rate is lower than 20% or the indoor temperature is lower than the set value of 1 ℃, the rotating speed of the compressor is gradually reduced to 20-30% of the rated rotating speed, and refrigerating is stopped after the low load state lasts for a set time, and in the heating mode, when the instantaneous load rate is lower than 20% or the indoor temperature is higher than the set value of 1 ℃, the rotating speed of the compressor is gradually reduced to 20-30% of the rated rotating speed, and heating is stopped after the low load state lasts for the set time.
3. The flexible control method for cross-region collaborative cooling and heating by dual-energy coupling according to claim 2, wherein in step S2, the time sequence collaboration is specifically: When the control system instructs a certain heat pump to increase the rotation speed of the compressor, ten seconds in advance sends a speed increasing instruction to a circulating pump put into operation in the area; when the control system instructs a certain heat pump to reduce the rotation speed of the compressor, delaying for ten seconds to send a speed reducing instruction to a circulating pump put into operation in the area; And in a key transition period of starting or stopping the heat pump unit, maintaining the current rotating speed of the circulating pump which is put into operation unchanged, and readjusting the pump speed after the heat pump operates stably.
4. A dual-energy coupled cross-zone co-cooling and heating flexible control method according to claim 3, wherein in step S3, the segmentation operation is as follows: When the ambient temperature is in the range of-5 ℃ to 5 ℃ and the average energy efficiency ratio of the heat pump is more than or equal to 2.0, controlling the heat pump to bear 80% to 90% of design heat load, and the boiler to bear peak regulation load; When the ambient temperature is less than or equal to minus 20 ℃, the heat pump is controlled to maintain 10 to 20 percent of rated output operation, and the boiler bears 80 to 90 percent of main heat supply load.
5. The method for flexibly controlling cross-zone co-cooling and heating by dual-energy coupling according to claim 4, wherein in step S4, the following conditions are simultaneously satisfied when the cross-zone support is triggered: a continuous load gap exists in the demand area; The switchable heat pump of the supporting area still has residual available capacity after meeting the own load demand of the supporting area; the above conditions are continuously established for more than five minutes.
6. The method for flexibly controlling cross-region collaborative cooling and heating according to claim 5, wherein in step S5, the processing when a single heat pump fails further comprises: and immediately closing the water inlet and outlet valves of the fault unit to isolate the fault unit from the circulating water system.
7. The dual-energy coupled cross-zone collaborative cooling and heating flexible control method according to claim 1, wherein step S3 further comprises an anti-freezing protection strategy: when the ambient temperature is less than or equal to minus 20 ℃, at least one electrode boiler is forced to keep 15-20% of the minimum output operation, so that the hot water continuously circulates in the pipe network.
8. The dual-energy coupled cross-zone collaborative cooling and heating flexible control method according to claim 1, wherein step S2 further comprises a system energy-saving optimization strategy: automatically reducing a target differential pressure set value of the circulating system and relaxing the minimum rotation speed limit of the circulating pump in a preset low-load period; when the total load rate of the area is continuously lower than a set threshold value and no rising trend is predicted, the control system enters a sleep mode, the circulating pump maintains the minimum circulating flow at an extremely low rotating speed, and all the heat pump units are stopped or standby.
9. A dual-energy coupled cross-zone co-cooling and heating system for executing the dual-energy coupled cross-zone co-cooling and heating flexible control method according to any one of claims 1 to 8, comprising: The heat pump unit comprises at least two local heat pump units and a switchable heat pump unit which are arranged in a first area, and at least two local heat pump units and a switchable heat pump unit which are arranged in a second area, wherein the switchable heat pump unit can be switched into a pipe network of another area through a valve; the auxiliary heat source unit of the electrode boiler comprises at least two electrode boilers, and is connected to a water supply and return header pipe of the first area and the second area through a pipe network formed by a plurality of electric switching valves; The variable-frequency circulating water system comprises a plurality of variable-frequency circulating pumps respectively arranged in a first area and a second area, and variable-frequency hot water circulating pumps which are independently configured for the electrode boiler units; the valve system comprises an electric switch valve arranged at an inlet and an outlet of each heat pump unit, a main valve arranged on a water supply and return main pipe of each region, a cooperative switching valve for realizing switching of pipelines of the switchable heat pump units, and a boiler switching valve for guiding the flow direction of hot water of a boiler; The flexible control system is configured to execute a control method and comprises a data acquisition and monitoring module for data acquisition and monitoring, a load prediction module for load prediction, a device capability calculation and matching module for device capability calculation and matching, a cooperative control algorithm module for executing a cooperative control algorithm and a safety protection and fault processing module for safety protection and fault processing.

Description

Dual-energy coupled cross-region collaborative cooling and heating system and flexible control method Technical Field The invention relates to the technical field of heating ventilation and air conditioning and regional energy systems, in particular to a dual-energy-coupling cross-region collaborative cooling and heating system and a flexible control method. Background The energy consumption of China building operation is 21.7% of the total social energy consumption, wherein the heating ventilation air conditioning system accounts for more than 60% (2024 is used for building data), the air source heat pump can heat in winter and cool in summer, has high energy efficiency ratio (COP), becomes a clean energy technology which is mainly popularized by the national 'double carbon' strategy, but due to the problem of low-temperature performance attenuation, the energy supply capacity and efficiency are reduced in extremely low-temperature weather, the conventional air source heat pump equipment is difficult to be applied to occasions with high energy supply safety coefficient requirements (such as hospitals), if the energy supply power is increased or the low-temperature air source heat pump is adopted, the investment is increased, and the application is limited to a certain extent. When one energy station supplies energy to a plurality of areas at the same time and the energy supply load curves of different areas are different, a cross-region cooperation mode can be considered, the cross-region cooperation has the advantages of load balance allocation, equipment resource utilization maximization and the like, the space barrier is broken, the energy efficiency optimization of reliable energy supply and full-time period is finally achieved through upgrading from 'passive response' to 'active adaptation', and the energy supply scheme can be optimized through the cross-region cooperation, so that initial investment cost is reduced. The public building load fluctuation of hospitals, commercial complexes and the like is large, cross-region coordination can stabilize peak load (for example, another region unit is called when a single region load suddenly increases), equipment waste of a large maraca trolley is avoided, double-energy coupling (heat pump and boiler) in extreme weather is avoided, the problem of low-temperature energy efficiency attenuation of a traditional heat pump system is solved, the heating ventilation air conditioning system with double-energy coupling and cross-region coordination has the characteristics of maximized equipment utilization (construction investment cost reduction), optimized running cost, improved system stability and flexibility, high system upgrading flexibility and the like, and the double-reduction of cost (construction and running) and carbon emission can be realized while the cooling and heating requirements of all regional systems of a large building group are met. Disclosure of Invention The invention aims at solving the problems in the background technology and provides a dual-energy coupled cross-region collaborative cooling and heating system and a flexible control method. The technical scheme of the invention is that the dual-energy coupling cross-region collaborative cooling and heating flexible control method comprises the following specific implementation steps: S1, based on the instantaneous power of each heat pump unit and the deviation between the indoor temperature of a service area and a set value, the rotation speed of a compressor of each heat pump is regulated in stages, high-frequency operation is adopted when the load ascends, medium-low-frequency operation is adopted when the load is stable, the deep energy-saving mode can be entered when the load is continuous and stable, the frequency is gradually reduced to stop when the load descends, and the rotation speed compensation is carried out according to the extreme environmental temperature in winter and summer; S2, taking the change of the total load rate of the area exceeding the set amplitude as a trigger signal, and cooperatively controlling the start and stop of a plurality of heat pumps and the speed regulation of the circulating pump in the area, wherein the circulating pump carries out closed-loop regulation based on the pressure difference and the flow of water supply and return and is cooperated with the regulation maintaining time sequence of the heat pump, and the method comprises the steps of advancing the speed of the circulating pump before the speed of the compressor of the heat pump is increased, delaying the speed of the circulating pump after the speed of the compressor of the heat pump is reduced, and maintaining the speed of the circulating pump to be stable during the acceleration and deceleration of the heat pump; S3, under a heat supply mode, the heat pump is used as a main heat source in a slight low-temperature section and the boiler is used for peak shaving, and the boiler is used a