CN110513767B - Heat supply network hydraulic balance regulation and control method and system based on resistance characteristics of heating power station - Google Patents

Heat supply network hydraulic balance regulation and control method and system based on resistance characteristics of heating power station Download PDF

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CN110513767B
CN110513767B CN201910911096.XA CN201910911096A CN110513767B CN 110513767 B CN110513767 B CN 110513767B CN 201910911096 A CN201910911096 A CN 201910911096A CN 110513767 B CN110513767 B CN 110513767B
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方大俊
周栋
谢金芳
朱浩强
韩三飞
张凯
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Changzhou Engipower Technology Co ltd
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Abstract

The invention belongs to the field of automatic heat supply control, and particularly relates to a heat supply network hydraulic balance control method and system based on the resistance characteristic of a heat station, wherein the heat supply network hydraulic balance control method based on the resistance characteristic of the heat station comprises the following steps: setting a global coordination system; analyzing actual values of the resistance characteristic coefficients of the heating power stations locally; calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and the hydraulic balance of the heat supply network is regulated and controlled on line according to the control strategy and the actual value, so that the hydraulic balance regulation and control based on the resistance characteristic coefficient are realized, and because the resistance characteristic coefficient is not influenced by the coupling of regulation of other heating power stations, the problems of lag and oscillation in the hydraulic balance regulation and control can be effectively avoided, and the quick regulation and control of the hydraulic balance of the heat supply network are realized.

Description

Heat supply network hydraulic balance regulation and control method and system based on resistance characteristics of heating power station
Technical Field
The invention belongs to the field of automatic heat supply control, and particularly relates to a heat supply network hydraulic balance control method and system based on the resistance characteristic of a heating power station.
Background
The central heating system mainly comprises a heat source, a heating station and a heat user, wherein heat produced by the heat source (generally stored by hot water) is transmitted to the heating station through a primary network of the heating system, and then is transmitted to the heat user through a secondary network. The typical control method of the central heating system is as follows: the control strategy of the lower heating power station is sent by the dispatching system of the centralized control center, can be a control strategy which tracks the secondary side water supply temperature, the return water temperature, the average temperature and the like of the heating power station and takes the temperature as feedback, or a control strategy which tracks the primary side flow of the heating power station, and adopts a PID feedback control algorithm to be controlled and executed by a controller of the heating power station. The geographical positions of the heating power stations are dispersed, and the temperature of the heat source side is transmitted to the heating power stations with strong delay effect, so that feedback adjustment is performed according to the temperature as a control parameter, and the hysteresis is high, and the accurate regulation and control of a heat supply network are not facilitated; the control strategy for tracking the flow of the heating power stations is easy to cause frequent fluctuation due to the coupling influence among the heating power stations, and cannot achieve a good control effect.
The hydraulic balance regulation and control process of the centralized heat supply pipe network is essentially to obtain the corresponding flow distribution relation of each heating power station according to the heat demand conversion, and the distribution relation is determined by the resistance characteristic of the pipe network and the resistance characteristic of each heating power station. The flow of the heating power stations is tracked by adopting feedback control, and the heating power stations are influenced by the adjusting actions of other heating power stations due to the coupling effect, so that the balance can be achieved by repeatedly adjusting for many times. And based on the resistance characteristic adjustment, the heating power stations are mutually independent, and if the resistance characteristic matching relationship among the heating power stations can be accurately calculated, the required flow distribution combination can be formed. The resistance characteristic of the heating power station is related to a series of resistance parts such as a dirt separator, a heat exchanger and a valve in the station, and finally reflects the synchronous change of the flow and the pressure difference of the station, so that the resistance characteristic of the heating power station is only related to the valve position (or the water pump frequency) of the adjustable valve in the actual heating process and is not related to the adjustment of other heating power stations.
Therefore, a new method and a system for regulating and controlling the hydraulic balance of the heat supply network based on the resistance characteristic of the heat station are needed to be designed based on the technical problems.
Disclosure of Invention
The invention aims to provide a heat supply network hydraulic balance regulation and control method and system based on the resistance characteristic of a heating power station.
In order to solve the technical problem, the invention provides a heat supply network hydraulic balance regulation and control method based on the resistance characteristic of a heating power station, which is characterized by comprising the following steps of:
setting a global coordination system;
analyzing actual values of the resistance characteristic coefficients of the heating power stations locally;
calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and
and performing online regulation and control on the hydraulic balance of the heat supply network according to the control strategy and the actual value.
Further, the method for setting the global coordination system comprises the following steps: setting a global coordination system at the cloud server end, establishing a thermal hydraulic calculation model consistent with the actual heat supply network structure in the global coordination system, butting upper and lower data of the heat supply network, and performing simulation analysis on the heat supply network, namely
Establishing a virtualized heat supply network structure model and virtual equipment consistent with a physical pipe network structure and physical equipment in a cloud global coordination system to form a thermal hydraulic calculation model, setting corresponding attribute parameters, operation data and working condition parameters for each virtual equipment, enabling the heat supply network structure model to simulate the operation working condition of an actual heat supply network, and calculating the operation characteristic of the equipment, the heat transfer state and flow state of the heat supply network, the pressure distribution of the heat supply network and the resistance characteristic distribution of a heat station.
Further, the method for locally analyzing the actual value of the resistance characteristic coefficient of each thermal power station comprises the following steps:
adding data processing module in each heating station controller to locally analyze and process the operating data of each heating station, and analyzing the actual value of the resistance characteristic coefficient of the heating station at the edge end in real time, that is to say
Calculating the actual value zeta of the resistance characteristic coefficient of each thermal station by the controller of each thermal stationmi；
Figure BDA0002214722100000031
The actual value of all thermal power stations is then ζm＝[ζm1,ζm2,ζm3,...,ζmi,...,ζmn]；
Wherein n is the number of the heat stations of the heat supply network, and i belongs to n;
u is a weather condition parameter;
Figure BDA0002214722100000032
the measured flow of the ith heating power station;
Figure BDA0002214722100000033
and the measured water supply and return pressure difference of the ith heating power station is obtained.
Further, the method for calculating the target value of the resistance characteristic coefficient of each thermal power station through the global coordination system and generating the control strategy comprises the following steps:
calculating the demand load and demand flow of each heating power station through a global coordination system, namely
Figure BDA0002214722100000034
Wherein:
phi is a calculation function of demand load and demand flow;
q is demand load, and is represented by Q ═ Q1,Q2,...,Qi,...,Qn]The unit is GJ/h;
q is the demand flow, and is expressed as q ═ q1,q2,...,qi,...,qn]The unit is t/h;
f is an identification model of the required flow, and the flow rate is determined according to the U in the historical operating condition,
Figure BDA0002214722100000035
Tfobtaining the data training;
Figure BDA0002214722100000036
supplying water temperature for a first-level network of a heating station, wherein the unit is;
Figure BDA0002214722100000037
the temperature of the return water of the secondary network of the heating station is expressed in unit;
Tfis heatThe average indoor temperature of the cell in which the force station is located is given in degrees centigrade.
Further, the method for calculating the target value of the resistance characteristic coefficient of each thermal power station through the global coordination system and generating the control strategy further comprises the following steps:
calculating the required pressure difference Δ p by globally coordinating the system access boundary conditions, i.e.
Δpi＝(Ps,Pr,q,Q,D),i∈n；
Wherein:
calculating a model function for the simulation of a heating system pipe network;
PSfor the pressure of the water supply, denoted Ps＝[Ps1,Ps2,...,Psi,...,Psn]；
PrIs the backwater pressure, denoted as Pr＝[Pr1,Pr2,...,Pri,...,Prn]；
Δ p is the demand pressure difference, expressed as Δ p ═ Δ p1,Δp2,...,Δpi,...,Δpn]；
D is the basic structure data of the heat supply network;
the boundary conditions include: the water supply system comprises a heat source side water supply temperature T, a water supply pressure Ps, a water return pressure Pr and a required flow q.
Further, the method for calculating the target value of the resistance characteristic coefficient of each thermal power station through the global coordination system and generating the control strategy further comprises the following steps:
calculating to obtain a calculation parameter [ q ] of the target resistance characteristic of the ith heating station through a calculation function phi of demand load and demand flow and a simulation calculation model function of a heating system pipe networki,Δpi]；
Calculating a target value of the resistance characteristic coefficient of the ith heat station according to the calculation parameters of the heat station:
Figure BDA0002214722100000041
zetagiAs a control strategy for the thermal stationAnd the control strategy zeta of the whole network heating power station of the physical heating networkgComprises the following steps: zetag＝[ζg1,ζg2,...,ζgi,...,ζgn]。
Further, the method for performing online regulation and control on the hydraulic balance of the heat supply network according to the control strategy and the actual value comprises the following steps:
predicting the required flow q of each heating station when the weather condition parameter is U in real time through a global coordination system, and combining the actually measured flow q of each heating stationmCalculating the hydraulic balance degree of each heating power station;
the hydraulic balance of the ith thermal station is:
Figure BDA0002214722100000051
when theta isiWhen ω is greater, k is k +1, if
Figure BDA0002214722100000052
When the hydraulic balance control system is used, a feedback control strategy is executed, the current hydraulic balance is kept, and the hydraulic balance regulation and control of the heat supply network are realized;
wherein omega is the stability of the hydraulic working condition of a single heating station; k is the number of hydraulic balance thermal force stations under a single working condition, and the initial value is 0; mu is the hydraulic balance degree of the heat supply network under a single working condition; rho is the occupation ratio standard of the hydraulic stable heating station;
when mu is less than rho, the corresponding control strategy is sent to the corresponding heating station through the global coordination system, and the heating station completes the hydraulic balance regulation according to the control strategy so as to realize the hydraulic balance regulation of the heating network, namely
According to the relation between the actual value and the target value of the resistance characteristic coefficient of the thermal power station, the opening degree of a valve of the thermal power station or the frequency of a water pump is adjusted, and the hydraulic balance regulation and control of the thermal power station are realized;
when ζ ismi＞ζgiIncreasing the valve opening degree of the thermal station or increasing the frequency of a water pump, and reducing the actual value of the resistance characteristic coefficient so as to realize hydraulic balance of the thermal station;
when ζ ismi＜ζgiWhile reducing the thermal stationThe opening of the valve or the frequency of the water pump is reduced, and the actual value of the resistance characteristic coefficient is increased, so that the hydraulic balance of the heating power station is realized;
when the actual value ζ of the coefficient of the resistance characteristic of the thermal station imiAnd a target value ζgiWhen the deviation of the second deviation is less than the preset value xi, the formula is satisfied:
Figure BDA0002214722100000053
the hydraulic balance of the thermal power station i is realized.
In another aspect, the present invention further provides a heat supply network hydraulic balance control system based on the resistance characteristics of the heat station, including:
a cloud server and a controller;
the controller is arranged in the heating power station, and the cloud server is connected with the controller;
the cloud server is suitable for setting a global coordination subsystem, calculating a target value of a resistance characteristic coefficient of each heating power station through the global coordination subsystem, and generating a control strategy;
the controller is suitable for analyzing the actual value of the resistance characteristic coefficient of the corresponding heat power station, and controls the hydraulic balance of the heat power station according to the control strategy and the actual value, so that the online regulation and control of the hydraulic balance of the heat supply network are realized.
The invention has the advantages that the invention sets a global coordination system; analyzing actual values of the resistance characteristic coefficients of the heating power stations locally; calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and the hydraulic balance of the heat supply network is regulated and controlled on line according to the control strategy and the actual value, so that the hydraulic balance regulation and control based on the resistance characteristic coefficient are realized, and because the resistance characteristic coefficient is not influenced by the coupling of regulation of other heating power stations, the problems of lag and oscillation in the hydraulic balance regulation and control can be effectively avoided, and the quick regulation and control of the hydraulic balance of the heat supply network are realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for regulating hydraulic balance of a heat supply network based on resistance characteristics of a heat station according to the present invention;
fig. 2 is a schematic block diagram of a cloud server and a heat supply network according to the present invention;
FIG. 3 is a functional block diagram of the global coordination system and thermal station in accordance with the present invention;
FIG. 4 is a control parameter diagram of the global coordination system and the heat network in accordance with the present invention;
FIG. 5 is a line graph of a target value in accordance with the present invention;
FIG. 6 is a schematic diagram of the thermal station controller device regulation feature access global coordination system control parameters in accordance with the present invention;
FIG. 7 is a flow chart of the hydraulic balance control of the thermal station i according to the present invention;
fig. 8 is a schematic block diagram of a thermal network hydraulic balance control system based on thermal station resistance characteristics according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Fig. 1 is a flow chart of a heat supply network hydraulic balance regulation method based on the resistance characteristic of a heat station.
As shown in fig. 1, this embodiment 1 provides a method for regulating and controlling hydraulic balance of a heat supply network based on resistance characteristics of a heat station, which includes: setting a global coordination system; analyzing actual values of the resistance characteristic coefficients of the heating power stations locally; calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and performing online regulation and control of the hydraulic balance of the heat supply network according to the control strategy and the actual value; the heat supply network is calculated and analyzed on line based on the global coordination system, the hydraulic balance regulation and control based on the resistance characteristic coefficient is realized by combining the edge calculation function of a local controller of the heat supply network, the delay and oscillation problems in the hydraulic balance regulation and control can be effectively avoided due to the characteristic that the resistance characteristic coefficient is not influenced by the coupling of regulation of other heating power stations, the quick regulation and control of the hydraulic balance of the heat supply network are realized, and the global coordination system arranged at the cloud end can help heat supply personnel to make a quick decision through the cloud service mode, the enterprise scheduling level is improved, and the decision time of the heat supply network regulation and control is shortened.
Fig. 2 is a schematic block diagram of a cloud server and a heat supply network according to the present invention;
FIG. 3 is a functional block diagram of the global coordination system and thermal station in accordance with the present invention;
fig. 4 is a control parameter diagram of the global coordination system and the heat supply network according to the present invention.
As shown in fig. 2, fig. 3, and fig. 4, in this embodiment, the method for setting the global coordination system includes: the method comprises the steps of arranging a global coordination system at a cloud server end, establishing a thermal hydraulic calculation model (namely establishing a 'digital twin' thermal hydraulic calculation model of the heat supply network) consistent with an actual heat supply network structure in the global coordination system, butting upper and lower data of the heat supply network, and carrying out simulation analysis on the heat supply network, wherein the global coordination system comprises the following steps: the system comprises a graphical interface, a heat distribution network and a heat distribution network, wherein the graphical interface supports that according to the structure of a physical pipe network and physical equipment (a heat source, a heat station, a water pump, a valve, a pipe section, a tee joint, a flowmeter, a pressure gauge, a heat exchanger and the like, the water pump can be a circulating pump, and the valve can be an adjusting valve), a virtualized heat network structure model and virtual equipment which are consistent with the physical pipe network structure and the physical equipment are established in a global coordination system to form a thermodynamic calculation model, and corresponding attribute parameters, operation data and working condition parameters are set for each virtual equipment, so that the heat network structure model can simulate the operation working condition of an actual heat network, and the operation characteristic of the physical equipment, the heat transmission state and flow state of the heat network, the pressure distribution of the heat network and the;
the heat source support setting parameters include but are not limited to water supply flow, water supply temperature, heat supply load, water supply pressure, water return pressure and the like; the parameters of the support setting of the heating power station include but are not limited to water supply flow, resistance characteristics, heating power station load, mark and the like; parameters of the water pump support setting include but are not limited to inlet pressure, outlet pressure, water pump flow, lift, efficiency, frequency, water pump characteristic curve, elevation and the like; the parameters of the valve support setting include, but are not limited to, valve opening, flow, differential pressure, valve type, valve characteristic curve, elevation, etc.; the parameters of the pipe section support setting include, but are not limited to, pipe length, pipe diameter, wall thickness, heat preservation coefficient, resistance correction coefficient, elevation and the like; parameters of tee support setting include but are not limited to elevation, tee type and the like;
under the condition of accessing target working condition parameters (the target working condition parameters of the heat supply system are generally weather working condition parameters, and a global coordination system arranged on a cloud server can be externally connected with the weather working condition parameters through an internet interface), the global coordination system supports forecasting of the demand load of each heating power station, and supports simulation of the operation rule of an actual heating network through simulation calculation and calculation of state parameters of the heating network on the premise of setting boundary conditions; the boundary conditions are calculation input conditions including attribute parameters of a heat source, a heat station, a water pump, a valve, a pipe section and the like on the premise of forming a calculated closed loop, and the calculated state parameters include but are not limited to flow distribution, temperature distribution, pressure distribution of a heat network, flow velocity distribution of the pipe section, section pressure difference distribution, heat station demand load, heat station demand flow and the like; for example: optional boundary condition parameters are: weather condition parameters, temperature of water supplied by a heat source side, water supply pressure and water return pressure; calculating parameters including the demand flow of the heat station, simulating and calculating the pressure difference of the heat station and calculating the resistance characteristic coefficient of the heat station;
the global coordination system can be deployed at a cloud server side and comprises a public cloud and a private cloud, and is based on a cloud computing architecture, a simulation computing and analysis service interface is provided for a heat supply enterprise, and data of a physical heat supply network is butted with data of simulation analysis of an upper cloud; the global coordination system is connected with the central control center heat supply network automatic control system and the lower heating power station (connected through a mobile network), and has the functions of: the method comprises the steps of butting a central control center heat supply network automatic control system, accessing a heat supply enterprise operation database, obtaining a heat supply network model (a virtualized heat supply network structure model with a consistent physical pipe network structure and physical equipment and virtual equipment) of a heat supply enterprise and operation data of a heat supply network, and taking the obtained operation data as an input condition for calculating a resistance characteristic coefficient by a global coordination system, wherein the required operation data of the heat supply system comprises the following steps: heat source supply and return water pressure, heat source supply water temperature and weather condition parameters; based on the weather condition parameters, the flow of the heating power station and the real-time load of the heating power station can be obtained, wherein the real-time load is related to the target working condition and is the required load under the target working condition; and (3) the lower thermal station is connected, and the result calculated by the global coordination system, namely the target value of the resistance characteristic coefficient of each thermal station (namely the control strategy) is sent.
In this embodiment, the method for locally analyzing the actual value of the resistance characteristic coefficient of each thermal power station includes: each heating station controller is additionally provided with a data processing module (the data processing module can comprise a memory and a processor unit), the controller can be used for locally analyzing and processing the operation data of each heating station by adopting a PLC (programmable logic controller), and the actual value of the resistance characteristic coefficient of the heating station, namely the actual value of the resistance characteristic coefficient of the heating station is analyzed in real time at the edge end
Calculating the actual value zeta of the resistance characteristic coefficient of each thermal station by the controller of each thermal stationmi；
Figure BDA0002214722100000101
The actual value of all thermal power stations is then ζm＝[ζm1,ζm2,ζm3,...,ζmi,...,ζmn]；
Wherein n is the number of the heat stations of the heat supply network, and i belongs to n;
u is a weather condition parameter and can be comprehensive measurement data such as outdoor temperature, wind speed, humidity, illumination, wind direction and the like;
Figure BDA0002214722100000102
measured flow (measured station port water supply pressure) for the ith heating station
Figure BDA0002214722100000103
Pressure of return water at station port
Figure BDA0002214722100000104
The difference);
Figure BDA0002214722100000105
and the measured water supply and return pressure difference of the ith heating power station is obtained.
The traditional controller equipment in the heating station is only used for collecting operation data of the heating station and sending the operation data to the centralized control center of a heating enterprise, does not process the data and only plays a role in receiving and sending the data; on this basis, carry out data analysis at heating power station terminal, more clear and definite division of labour between each system, centralized control center autonomous system is responsible for data acquisition and uploads, and high in the clouds global coordination system (setting up the global coordination system at high in the clouds server promptly) is responsible for butt joint centralized control center data and next heating power station, implements the emulation calculation and the parameter of target operating mode and issues, consequently, adds data processing module at the controller of heating power station, and the information that the data processing module of each heating power station need be handled includes: (1) data preprocessing, namely processing the actually measured data by using a data cleaning method, including cleaning and correcting abnormal data and error data and the like; (2) and the access cloud server receives a control strategy (namely a target value of the resistance characteristic coefficient of the heat station) generated by the global coordination system, and the control strategy is used as a target parameter for feedback control of the controller to track. (3) Storing information such as flow, water supply and pressurization, backwater pressure, regulation parameters (valve opening or water pump frequency, hereinafter referred to as "regulation parameters"), cloud platform network information (including cloud server IP and port) and the like of the thermal power station; (4) and reading the measured data (real-time weather condition parameters), calculating the actual value of the resistance characteristic coefficient of each heating station, and guiding the regulation and control of the lower physical equipment according to the target value of the resistance characteristic coefficient of the heating station sent by the cloud server, so that the heating station realizes hydraulic balance.
Fig. 5 is a line graph of the target value according to the present invention.
As shown in fig. 5, in the present embodiment, the method for calculating the target value of the resistance characteristic coefficient of each thermal power station through the global coordination system and generating the control strategy includes: calculating the demand load and demand flow of each heating power station through a global coordination system, namely
Figure BDA0002214722100000111
Wherein:
phi is a calculation function of demand load and demand flow;
q is demand load, and is represented by Q ═ Q1,Q2,...,Qi,...,Qn]The unit is GJ/h;
q is the demand flow, and is expressed as q ═ q1,q2,...,qi,...,qn]The unit is t/h;
f is an identification model of the required flow, and the flow rate is determined according to the U in the historical operating condition,
Figure BDA0002214722100000112
Tfobtaining the data training;
Figure BDA0002214722100000113
supplying water temperature for a first-level network of a heating station, wherein the unit is;
Figure BDA0002214722100000114
the temperature of the return water of the secondary network of the heating station is expressed in unit;
Tfthe average indoor temperature of the district where the heating station is located is given as the unit of ℃.
In this embodiment, the method for calculating the target value of the resistance characteristic coefficient of each thermal power station through the global coordination system and generating the control strategy further includes:
calculating the required pressure difference Δ p by globally coordinating the system access boundary conditions, i.e.
Δpi＝(Ps,Pr,q,Q,D),i∈n；
Wherein:
calculating a model function for the simulation of a heating system pipe network;
PSis the water supply pressure expressed in MPa and is expressed as Ps＝[Ps1,Ps2,...,Psi,...,Psn]；
PrIs the backwater pressure in MPa and is expressed as Pr＝[Pr1,Pr2,...,Pri,...,Prn]；
Δ p is the demand pressure difference, expressed as Δ p ═ Δ p1,Δp2,...,Δpi,...,Δpn]；
D is basic structure data of the heat supply network, and can comprise physical inherent attribute data such as pipe diameter specification, pipe length (pipe length is l, unit is m), heat insulation material, elevation and the like;
the boundary conditions include: temperature T of water supply from heat source side and pressure P of water supplysPressure of return water PrAnd a demand flow q.
In this embodiment, the calculation of the resistance characteristic coefficient of each thermal power station through the global coordination systemThe method of generating a control strategy and generating a target value further comprises: calculating to obtain a calculation parameter [ q ] of the target resistance characteristic of the ith heating station through a calculation function phi of demand load and demand flow and a simulation calculation model function of a heating system pipe networki,Δpi](ii) a Calculating a target value of the resistance characteristic coefficient of the ith heat station according to the calculation parameters of the heat station:
Figure BDA0002214722100000121
zetagiAs the control strategy (controlled variable of each heat power station) of the heat power station, the control strategy ζ of the heat power station of the whole physical heat networkgComprises the following steps: zetag＝[ζg1,ζg2,...,ζgi,...,ζgn](ii) a The coefficients represent the flow distribution relationship between the thermal stations.
Fig. 6 is a schematic diagram of the control parameters of the thermal station controller device for regulating and controlling the access of the characteristic to the global coordination system according to the present invention.
As shown in fig. 6, in this embodiment, the method for performing online regulation and control of hydraulic balance of a heat supply network according to a control strategy and an actual value includes: predicting the required flow q of each heating station when the weather condition parameter is U in real time through a global coordination system, and combining the actually measured flow q of each heating stationmCalculating the hydraulic balance degree of each heating power station; the hydraulic balance of the ith thermal station is:
Figure BDA0002214722100000131
when theta isiWhen ω is greater, k is k +1, if
Figure BDA0002214722100000132
When the system is used, the local heating station executes a feedback control strategy, keeps the current hydraulic balance and realizes the hydraulic balance regulation and control of the heating network;
wherein, omega is the stability of the hydraulic working condition of a single heating station, and the parameter can be set manually; k is the number of hydraulic balance thermal force stations under a single working condition, and the initial value is 0; mu is the hydraulic balance degree of the heat supply network under a single working condition; rho is a hydraulic stability heating station proportion standard, and the parameter can be set manually;
when mu is less than rho, the corresponding control strategy is sent to the corresponding heat station through the global coordination system, the heat station completes hydraulic balance regulation according to the control strategy to realize heat supply network hydraulic balance regulation, namely, the valve opening degree or the water pump frequency of the heat station is regulated (namely, a controller of the heat station controls an execution mechanism) according to the relation between the actual value and the target value of the resistance characteristic coefficient of the heat station, so as to realize the hydraulic balance regulation of the heat station; when ζ ismi＞ζgiWhen the actual value of the resistance characteristic coefficient is reduced to be equal to a target value, the hydraulic balance of the thermal power station achieves the optimal effect, so that the thermal power station realizes the hydraulic balance; when ζ ismi＜ζgiWhen the water flow rate of the heat station is increased, the opening degree of a valve of the heat station is increased, or the frequency of a water pump is increased, and the actual value of the resistance characteristic coefficient is increased (when the actual value of the resistance characteristic coefficient is increased to be equal to a target value, the hydraulic balance of the heat station achieves the optimal effect), so that the heat station achieves the hydraulic balance;
when the actual value ζ of the coefficient of the resistance characteristic of the thermal station imiAnd a target value ζgiWhen the deviation of the second deviation is less than the preset value xi, the formula is satisfied:
Figure BDA0002214722100000141
the hydraulic balance of the thermal power station i is realized.
Example 2
Fig. 7 is a flow chart of hydraulic balance control of the thermal station i according to the present invention.
As shown in fig. 7, in addition to embodiment 1, embodiment 2 will be described by taking the ith thermal station at time t as an example; the global coordination system arranged on the cloud server reads the latest heat supply network structure model of the heat supply enterprise and accesses the weather condition parameter U at the moment tt,
Figure BDA0002214722100000142
TftCalculating the required flow q at the moment t in real time based on the function ftSimultaneously calculating the hydraulic balance degree mu of the heat supply network under a single working condition;
when mu is less than rho, the boundary condition of the T moment, namely the water supply temperature T on the heat source side is accessedtWater supply and return pressure Pst、PrtDemand load QtAnd the required flow qtCalculating a calculation parameter [ q ] of the target resistance characteristic of the ith heating station at the time t based on a simulation calculation model function gamma of a heating system pipe networkti,Δpti]So as to calculate a target value zeta of the resistance characteristic coefficient of the ith thermal stationgiAnd as a control strategy, the control strategy is sent to the ith heating power station by the global coordination system, and the controller of the heating power station controls the execution mechanism to adjust and realize the hydraulic balance regulation of the heating power station according to the relation between the actual value and the target value, namely the controller calculates the actual value zeta of the resistance characteristic coefficient of the heating power station in real timemiAnd automatically following the target value through the opening degree (or water pump frequency) of the regulating valve, and controlling the heating power station regulating and controlling equipment, namely:
when ζ ismi＞ζgiWhen the operation is performed, the opening of the valve of the thermal station is increased or the frequency of the water pump is increased (the operation is selected according to the actual situation of the thermal station, the valve is adjusted when the actuating mechanism of the thermal station is the valve, the water pump is adjusted when the actuating mechanism of the thermal station is the water pump, for example, the opening of the electric regulating valve is adjusted when the actuating mechanism of the thermal station is the electric regulating valve, the thermal station can be called as an electric regulating valve station, the frequency of the booster pump is adjusted when the actuating mechanism of the thermal station is the booster pump, and the thermal station can be called as an electric regulating valve station at this timeBooster pump station), reducing the actual value of the resistance characteristic coefficient (when the actual value of the resistance characteristic coefficient is reduced to be equal to the target value, the hydraulic balance of the thermal station achieves the optimal effect), so that the thermal station achieves the hydraulic balance;
when ζ ismi＜ζgiWhen the water flow reaches the target value, the water flow reaches the optimal effect, and the water flow reaches the target value, so that the water flow is balanced until the moment t + 1;
at the moment of t +1, the global coordination system judges the hydraulic balance condition of the heat supply network again, selects different control strategies and repeatedly executes a heat supply network hydraulic balance regulation and control method based on the resistance characteristic of the heat supply station, so that the online rapid regulation and control of the hydraulic balance of the heat supply network are realized.
Example 3
Fig. 8 is a schematic block diagram of a thermal network hydraulic balance control system based on thermal station resistance characteristics according to the present invention.
As shown in fig. 8, on the basis of the embodiments 1 and 2, the embodiment 3 further provides a heat supply network hydraulic balance regulation and control system based on the resistance characteristics of the heat supply station, including: a cloud server and a controller; the controller is arranged in the heating power station, and the cloud server is connected with the controller; the cloud server is suitable for setting a global coordination subsystem, calculating a target value of a resistance characteristic coefficient of each heating power station through the global coordination subsystem, and generating a control strategy; the controller is suitable for analyzing the actual value of the resistance characteristic coefficient of the corresponding heat power station, and controls the hydraulic balance of the heat power station according to the control strategy and the actual value, so that the online regulation and control of the hydraulic balance of the heat supply network are realized.
The invention has the advantages that the invention sets a global coordination system; analyzing actual values of the resistance characteristic coefficients of the heating power stations locally; calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and the hydraulic balance of the heat supply network is regulated and controlled on line according to the control strategy and the actual value, so that the hydraulic balance regulation and control based on the resistance characteristic coefficient are realized, and because the resistance characteristic coefficient is not influenced by the coupling of regulation of other heating power stations, the problems of lag and oscillation in the hydraulic balance regulation and control can be effectively avoided, and the quick regulation and control of the hydraulic balance of the heat supply network are realized.
In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (5)

1. A heat supply network hydraulic balance regulation and control method based on the resistance characteristic of a heating power station is characterized by comprising the following steps:
setting a global coordination system;
analyzing actual values of the resistance characteristic coefficients of the heating power stations locally;
calculating a target value of the resistance characteristic coefficient of each heating power station through a global coordination system, and generating a control strategy; and
carrying out online regulation and control on the hydraulic balance of the heat supply network according to the control strategy and the actual value;
the method for setting the global coordination system comprises the following steps: setting a global coordination system in the cloud server, establishing a thermal hydraulic calculation model consistent with the actual heat supply network structure in the global coordination system, butting upper and lower data of the heat supply network, and performing simulation analysis on the heat supply network, namely
Establishing a virtualized heat supply network structure model and virtual equipment consistent with a physical pipe network structure and physical equipment in a cloud global coordination system to form a thermal hydraulic calculation model, setting corresponding attribute parameters, operation data and working condition parameters for each virtual equipment, enabling the heat supply network structure model to simulate the operation working condition of an actual heat supply network, and calculating the operation characteristic of the equipment, the heat transfer state and flow state of the heat supply network, the pressure distribution of the heat supply network and the resistance characteristic distribution of a heat station;
the method for locally analyzing the actual value of the resistance characteristic coefficient of each thermal power station comprises the following steps:
adding data processing module in each heating station controller to locally analyze and process the operating data of each heating station, and analyzing the actual value of the resistance characteristic coefficient of the heating station at the edge end in real time, that is to say
Calculating the actual value zeta of the resistance characteristic coefficient of each thermal station by the controller of each thermal stationmi；
Figure FDA0002705445610000011
The actual value of all thermal power stations is then ζm＝[ζm1,ζm2,ζm3,...,ζmi,...,ζmn]；
Wherein n is the number of the heat stations of the heat supply network, and i belongs to n;
u is a weather condition parameter;
Figure FDA0002705445610000012
the measured flow of the ith heating power station;
Figure FDA0002705445610000021
the measured pressure difference of supply water and return water of the ith heating station;
the method for calculating the target value of the resistance characteristic coefficient of each heating power station through the global coordination system and generating the control strategy comprises the following steps:
calculating the demand load and demand flow of each heating power station through a global coordination system, namely
Figure FDA0002705445610000022
Wherein:
phi is a calculation function of demand load and demand flow;
q is demand load, and is represented by Q ═ Q1,Q2,...,Qi,...,Qn]The unit is GJ/h;
q is the demand flow, expressed as q ═ q[q1,q2,...,qi,...,qn]The unit is t/h;
f is an identification model of the required flow, and the flow rate is determined according to the U in the historical operating condition,
Figure FDA0002705445610000023
Tfobtaining the data training;
Figure FDA0002705445610000024
supplying water temperature for a first-level network of a heating station, wherein the unit is;
Figure FDA0002705445610000025
the temperature of the return water of the secondary network of the heating station is expressed in unit;
Tfthe average indoor temperature of the district where the heating station is located is given as the unit of ℃.
2. The method of regulating hydraulic balance in a heat supply network of claim 1,
the method for calculating the target value of the resistance characteristic coefficient of each heating power station through the global coordination system and generating the control strategy further comprises the following steps:
calculating the required pressure difference Δ p by globally coordinating the system access boundary conditions, i.e.
Δpi＝(Ps,Pr,q,Q,D),i∈n；
Wherein:
calculating a model function for the simulation of a heating system pipe network;
PSfor the pressure of the water supply, denoted Ps＝[Ps1,Ps2,...,Psi,...,Psn]；
PrIs the backwater pressure, denoted as Pr＝[Pr1,Pr2,...,Pri,...,Prn]；
Δ p is the demand pressure difference, expressed as Δ p ═ Δ p1,Δp2,...,Δpi,...,Δpn]；
D is the basic structure data of the heat supply network;
the boundary conditions include: temperature T of water supply from heat source side and pressure P of water supplysPressure of return water PrAnd a demand flow q.
3. The method of regulating hydraulic balance in a heat supply network of claim 2,
the method for calculating the target value of the resistance characteristic coefficient of each heating power station through the global coordination system and generating the control strategy further comprises the following steps:
calculating to obtain a calculation parameter [ q ] of the target resistance characteristic of the ith heating station through a calculation function phi of demand load and demand flow and a simulation calculation model function of a heating system pipe networki,Δpi]；
Calculating a target value of the resistance characteristic coefficient of the ith heat station according to the calculation parameters of the heat station:
Figure FDA0002705445610000031
zetagiAs the control strategy of the heating power station, the control strategy zeta of the heating power station of the whole physical heating networkgComprises the following steps: zetag＝[ζg1,ζg2,...,ζgi,...,ζgn]。
4. The method of claim 3, wherein the method comprises the steps of,
the method for carrying out online regulation and control on the hydraulic balance of the heat supply network according to the control strategy and the actual value comprises the following steps:
predicting the required flow q of each heating station when the weather condition parameter is U in real time through a global coordination system, and combining the actually measured flow q of each heating stationmCalculating the hydraulic balance degree of each heating power station;
the hydraulic balance of the ith thermal station is:
Figure FDA0002705445610000032
when theta isiWhen ω is greater, k is k +1, if
Figure FDA0002705445610000033
When the hydraulic balance control system is used, a feedback control strategy is executed, the current hydraulic balance is kept, and the hydraulic balance regulation and control of the heat supply network are realized;
wherein omega is the stability of the hydraulic working condition of a single heating station; k is the number of hydraulic balance thermal force stations under a single working condition, and the initial value is 0; mu is the hydraulic balance degree of the heat supply network under a single working condition; rho is the occupation ratio standard of the hydraulic stable heating station;
when mu is less than rho, the corresponding control strategy is sent to the corresponding heating station through the global coordination system, and the heating station completes the hydraulic balance regulation according to the control strategy so as to realize the hydraulic balance regulation of the heating network, namely
According to the relation between the actual value and the target value of the resistance characteristic coefficient of the thermal power station, the opening degree of a valve of the thermal power station or the frequency of a water pump is adjusted, and the hydraulic balance regulation and control of the thermal power station are realized;
when ζ ismi＞ζgiIncreasing the valve opening degree of the thermal station or increasing the frequency of a water pump, and reducing the actual value of the resistance characteristic coefficient so as to realize hydraulic balance of the thermal station;
when ζ ismi＜ζgiWhen the water pump is started, the opening degree of a valve of the heating power station is reduced or the frequency of the water pump is reduced, and the actual value of the resistance characteristic coefficient is increased, so that the hydraulic balance of the heating power station is realized;
when the actual value ζ of the coefficient of the resistance characteristic of the thermal station imiAnd a target value ζgiWhen the deviation of the second deviation is less than the preset value xi, the formula is satisfied:
Figure FDA0002705445610000041
the hydraulic balance of the thermal power station i is realized.
5. A heat supply network hydraulic balance regulation and control system based on heating power station resistance characteristics is characterized by comprising:
a cloud server and a controller;
the controller is arranged in the heating power station, and the cloud server is connected with the controller;
the cloud server is suitable for setting a global coordination subsystem, calculating a target value of a resistance characteristic coefficient of each heating power station through the global coordination subsystem, and generating a control strategy;
the controller is suitable for analyzing the actual value of the resistance characteristic coefficient of the corresponding heat station, and controlling the hydraulic balance of the heat station according to the control strategy and the actual value, so as to realize the online regulation and control of the hydraulic balance of the heat supply network, namely
The controller is suitable for analyzing actual values of resistance characteristic coefficients of corresponding thermal power stations by adopting the thermal power station resistance characteristic-based thermal power network hydraulic balance regulation and control method according to any one of claims 1 to 4, and controlling the thermal power station hydraulic balance according to a control strategy and the actual values, so as to realize online regulation and control of the thermal power network hydraulic balance.
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