CN-122015166-A - Commercial building key load geothermal refined regulation and control method and system

CN122015166ACN 122015166 ACN122015166 ACN 122015166ACN-122015166-A

Abstract

The invention relates to the field of geothermal regulation and control, in particular to a method and a system for finely regulating and controlling key load geothermal of a commercial building. The method comprises the steps of collecting key parameters such as geothermal recharging temperature, secondary network backwater temperature and heat pump unit load rate in real time, dynamically adjusting geothermal exploitation flow through a closed loop control algorithm based on deviation between recharging temperature and a set value, combining the secondary network backwater temperature and the heat pump load rate, adjusting the heating machine unit to be on, off or maintain operation, and supplementing municipal heat sources when the heat pump output reaches the upper limit and is not matched, and exiting after the load is reduced. According to the scheme, autonomous and flexible adaptation of severe fluctuation heat load of a commercial building is realized, frequent shutdown of a heat pump under a low-load working condition is avoided, geothermal exploitation flow is accurately matched with real-time heat load, geothermal recharging temperature is reduced, and the problems that load fluctuation cannot be handled by traditional regulation and control, the heat pump is stopped, recharging temperature exceeds standard and the like are effectively solved.

Inventors

HU WENJIN
Hou Deren
LIU YANG
WU PEI
ZHANG ZE
ZHU DI
Pei Ziting
FENG ZHAOYUE
ZHANG YUNFEI

Assignees

中国雄安集团智慧能源有限公司

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (10)

1. The method for finely regulating and controlling the geothermal energy of the key load of the commercial building is characterized by comprising the following steps: collecting actual measured values of geothermal recharging temperature, secondary network backwater temperature and operating key parameters of a heat pump unit load rate system in real time; dynamically adjusting geothermal exploitation flow through a closed-loop control algorithm based on the deviation between the actual geothermal recharging temperature measured value and a preset geothermal recharging temperature set value; judging a matching state of total output of the heat pump system and required heat load based on the secondary network backwater temperature and the heat pump unit load rate, and executing machine adding, machine subtracting or maintenance operation of the heat pump unit according to the matching state; And when the total output of the heat pump system reaches the upper limit and is not matched, controlling the municipal heat source to intervene in the supplementary heat, and controlling the municipal heat source to exit when the load is reduced.
2. The method for finely regulating and controlling the geothermal energy of the key load of the commercial building according to claim 1, wherein the step of dynamically regulating the geothermal exploitation flow by the closed-loop control algorithm comprises the following steps: Calculating a deviation E between the geothermal recharging temperature actual measurement PV and the geothermal recharging temperature setpoint SV, wherein the deviation E = SV-PV; Inputting the deviation E into a preset PID control algorithm, and obtaining a frequency control quantity u (k) after proportional, integral and differential operations; And sending a frequency adjustment instruction to the geothermal exploitation variable-frequency water pump according to the frequency control quantity u (k), adjusting the running frequency of the water pump, and changing the geothermal exploitation flow, so that the actual measured value PV of the geothermal recharging temperature approaches to the set value SV of the geothermal recharging temperature, and the geothermal exploitation flow is matched with the real-time thermal load of the commercial building.
3. The method for finely controlling the geothermal energy of the key load of the commercial building according to claim 1, wherein the step of performing the on-machine, off-machine or maintenance operation of the heat pump unit according to the matching state comprises the steps of: When the backwater temperature of the secondary network is lower than a heating temperature set value or the load rate of the heat pump units is higher than a heating load rate set value, and the number of the heat pump units currently running is smaller than the maximum available number, triggering heating operation, and starting a new heat pump unit, a corresponding circulating water pump and an electric valve according to a preset sequence; When the backwater temperature of the secondary network is higher than the set value of the reducing machine temperature, the load rate of the heat pump units is lower than the set value of the reducing machine load rate, and the number of the heat pump units currently running is larger than or equal to one, the reducing machine operation is triggered, one running heat pump unit and auxiliary equipment thereof are stopped according to a preset sequence, the number of the running heat pump units is dynamically regulated, the total output of the heat pump system is matched with the required heat load, and the running of the single heat pump unit in a safe working load interval is maintained.
4. The method for finely regulating and controlling the geothermal energy of the key loads of the commercial building according to claim 3, wherein the preset sequence of the machine adding operation and the machine subtracting operation comprises the sequential logic and interval time control of the start and stop of the equipment; Starting an electric valve of a heat pump unit corresponding to a target heat pump unit, starting a circulating water pump at an evaporation side and a condensation side corresponding to the target heat pump unit after receiving a feedback signal that the valve is in place, delaying for a first preset time, and finally starting the target heat pump unit; the sequence of the machine reduction operation is that the target heat pump unit is stopped firstly, the corresponding evaporating side and condensing side circulating water pumps are stopped after the second preset time is delayed, and the corresponding heat pump unit electric valves of the target heat pump unit are closed finally after the third preset time is delayed.
5. The method for fine control of geothermal critical loads for commercial buildings according to claim 1, further comprising the step of controlling the medium water temperature protectively: Monitoring the intermediate water temperature of the evaporation side of the heat pump unit in real time; when the intermediate water temperature reaches a preset high limit value, closing the primary side electric valve of the geothermal secondary plate and simultaneously fully opening the bypass electric valve of the geothermal secondary plate, and cutting off geothermal water flow passing through the geothermal secondary plate heat exchanger to reduce the intermediate water temperature; When the intermediate water temperature is reduced to a preset low limit value, the primary side electric valve of the geothermal secondary plate exchange is opened, the bypass electric valve of the geothermal secondary plate exchange is closed, heat exchange of the geothermal secondary plate heat exchanger is recovered, the intermediate water temperature is increased, and therefore the intermediate water Wen Duwen is fixed in an allowable range of safe operation of the heat pump unit.
6. The method for finely controlling the geothermal energy of critical loads of commercial buildings according to claim 1, wherein the judgment logic for controlling the intervention and the withdrawal of municipal heat sources comprises the following specific steps: The municipal heat source intervention condition is that the secondary network backwater temperature is lower than an intervention temperature set value, the heat pump unit load rate is higher than an intervention load rate set value, the number of currently operated heat pump units reaches the maximum available number, and when the condition is simultaneously met, the municipal primary network electric regulating valve and the municipal plate exchange circulating pump are controlled to be started; the municipal heat source exit condition is that the secondary network backwater temperature is higher than an exit temperature set value, the heat pump unit load rate is lower than an exit load rate set value, and the number of the heat pump units currently running is greater than or equal to one.
7. The commercial building key load geothermal fine regulation and control system is based on the commercial building key load geothermal fine regulation and control method of any one of claims 1-6, and is characterized by comprising a process subsystem, a perception layer, an execution layer and a control layer; The process subsystem comprises a medium-deep geothermal exploitation recharging subsystem, a high-temperature heat pump heat extraction subsystem and a municipal heat source auxiliary subsystem, wherein the medium-deep geothermal exploitation recharging subsystem is formed by connecting a geothermal exploitation well, a recharging well, a geothermal primary plate heat exchanger and a geothermal secondary plate heat exchanger through pipelines, the high-temperature heat pump heat extraction subsystem is formed by connecting at least two water source heat pump units connected in parallel and corresponding circulating water pumps through pipelines, and the municipal heat source auxiliary subsystem is formed by connecting a municipal primary heat supply network, a municipal plate heat exchanger and a municipal plate exchange circulating pump through pipelines; the sensing layer comprises temperature sensors, pressure transmitters and flow meters which are arranged on key nodes of each process subsystem and are used for collecting key system operation parameters; The execution layer comprises a geothermal exploitation variable-frequency water pump, a plurality of electric valve actuators, a water source heat pump unit controller and a circulating water pump controller; The control layer takes a Programmable Logic Controller (PLC) as a core, the PLC is connected with each controller and the executor of the sensing layer sensor and the execution layer through a communication network, and the control program of the method of any one of claims 1 to 6 is stored and operated in the PLC so as to coordinate and control the operation of the three process subsystems.
8. The system of claim 7, wherein the sensor arranged on the sensing layer comprises a geothermal recharging temperature sensor and a pressure transmitter which are arranged on a geothermal recharging pipeline, a geothermal exploitation temperature sensor, a pressure transmitter and a flowmeter which are arranged on geothermal exploitation pipelines, plate exchange temperature sensors which are arranged at inlets and outlets on two sides of a geothermal primary plate heat exchanger and a geothermal secondary plate heat exchanger, heat pump temperature and pressure sensors which are arranged on the evaporation side and the condensation side of each water source heat pump unit, a secondary network backwater temperature sensor which is arranged on a secondary network backwater main pipe, and municipal plate exchange temperature sensors which are arranged at inlets and outlets on two sides of a municipal plate heat exchanger, so as to jointly form a parameter monitoring network for covering the whole system.
9. The fine geothermal regulation and control system for key loads of commercial buildings according to claim 7, wherein the plurality of electric valve actuators of the actuator layer comprise a geothermal secondary plate exchange primary side electric valve installed on a primary side inlet pipeline of a geothermal secondary plate heat exchanger, a geothermal secondary plate exchange bypass electric valve installed on a bypass pipeline of the geothermal secondary plate heat exchanger, a heat pump unit electric valve installed on an evaporation side inlet pipeline of each water source heat pump unit, a municipal primary network electric regulation valve installed on a municipal primary heat network access pipeline, and branch regulation valves installed on branch pipelines of a secondary network water separator-collector, the geothermal exploitation variable frequency water pump is installed in a geothermal exploitation well, the water source heat pump unit controller is built in each unit, and the circulating water pump controller is matched with each circulating water pump.
10. The commercial building key load geothermal refined regulation system according to claim 7 is characterized in that a Programmable Logic Controller (PLC) of the control layer is integrally connected with equipment of a sensing layer and an execution layer through an industrial Ethernet or a field bus to realize data acquisition and instruction issuing, the PLC is also connected with a human-computer interaction interface (HMI) for displaying real-time operation parameters, equipment states and alarm information of the system and providing setting interfaces of geothermal recharging temperature set values, heating/subtracting machine temperature set values and intervention/withdrawal temperature set value parameters, and a geothermal flow regulation module, a heat pump cooperative regulation module and a municipal heat source regulation module are modularly integrated by a PLC internal program.

Description

Commercial building key load geothermal refined regulation and control method and system Technical Field The invention relates to the field of geothermal regulation and control, in particular to a method and a system for finely regulating and controlling key load geothermal of a commercial building. Background With the improvement of clean energy utilization requirements, the mid-deep geothermal energy becomes an important choice for heat supply of commercial buildings by virtue of the advantages of abundant reserves, environmental protection and high efficiency. However, the heat load for commercial buildings has obvious severe fluctuation characteristics, the load difference between the working day and the night as well as the holiday is obvious, the peak-valley difference is large, the heat utilization period is highly concentrated, and the strict requirement is imposed on the regulation and control capability of the central deep geothermal heat supply system. At present, the mainstream regulation and control mode in the industry still takes traditional manual experience as the main part, and the core relies on the field observation, the history operation experience and the manual operation of operators, and the rough matching of heat supply quantity and load is realized through the cycle of limited data, experience judgment and manual operation. The control mode lacks a quantitative control model and an automatic feedback mechanism, the sensing basis only depends on sensory observation and basic instrument reading, the execution process completely depends on manual valve opening adjustment, equipment start-stop and parameter setting, the feedback closed loop period is as long as 1-3 hours, and the dynamic change of the commercial building heat load cannot be responded in real time. On one hand, the traditional manual regulation and control is difficult to realize the dynamic adaptation of the severe fluctuation heat load of a medium-deep geothermal heat supply system and a commercial building, and the situation that the heat supply quantity is lagged behind the load change often occurs, so that the heat supply comfort is affected due to staged overheat or supercooling; meanwhile, because the exploitation flow regulation of the geothermal well depends on manual judgment, the condition of unmatched exploitation flow and heat load in real time often occurs, and the geothermal recharging temperature is too high, thereby not only wasting geothermal energy, but also possibly causing geological environment problems. Although the existing partial heat regulation platform realizes basic parameter monitoring and simple regulation functions, the scientific research field also develops related intelligent regulation algorithm research, but the general lack of subsystem cooperative coordination capability and large-scale engineering practice verification still cannot solve the core problem of autonomous and flexible regulation under severe fluctuation of heat load of commercial buildings. Disclosure of Invention The invention provides a method and a system for finely regulating and controlling the geothermal energy of key loads of commercial buildings, and aims to solve the problems that the traditional regulating and controlling method cannot cope with the fluctuation of the thermal load of the commercial buildings, the shutdown of a heat pump, the exceeding of recharging temperature and the like. In order to achieve the above purpose, the following technical scheme is adopted. The method for finely regulating and controlling the geothermal energy of the key load of the commercial building comprises the following steps: collecting actual measured values of geothermal recharging temperature, secondary network backwater temperature and operating key parameters of a heat pump unit load rate system in real time; dynamically adjusting geothermal exploitation flow through a closed-loop control algorithm based on the deviation between the actual geothermal recharging temperature measured value and a preset geothermal recharging temperature set value; judging a matching state of total output of the heat pump system and required heat load based on the secondary network backwater temperature and the heat pump unit load rate, and executing machine adding, machine subtracting or maintenance operation of the heat pump unit according to the matching state; And when the total output of the heat pump system reaches the upper limit and is not matched, controlling the municipal heat source to intervene in the supplementary heat, and controlling the municipal heat source to exit when the load is reduced. Optionally, the step of dynamically adjusting the geothermal exploitation flow by a closed loop control algorithm specifically includes: Calculating a deviation E between the geothermal recharging temperature actual measurement PV and the geothermal recharging temperature setpoint SV, wherein the deviation E = SV-PV; Inputting the de