A method and system for optimizing control of a thermal energy storage frequency regulation system and medium

Abstract

The present application relates to the technical field of energy control, and particularly relates to a kind of storage No. heat pump energy storage frequency modulation optimization control method, system and medium, method includes: the establishment of the electric-thermal coupling model of the heat pump energy storage thermal-electric conversion relationship of the dynamic of power system frequency, the temperature dynamic of heating system and storage No.;Frequency deviation signal and temperature state information are acquired, and the temperature characteristic quantity of whole network is determined;Frequency deviation signal and the temperature characteristic quantity of whole network are used as collaborative control input, and the frequency modulation power of storage No. heat pump energy storage and the compensation power of traditional heat source are determined;According to electric-thermal coupling model, frequency modulation power and compensation power, the collaborative power distribution without prior information is carried out;Based on the allocation result, storage No. heat pump energy storage and traditional heat source are controlled to run, so that storage No. heat pump energy storage system participates in frequency modulation and maintains stable operation of heating. Through the present application, the problem that existing heat pump energy storage system lacks electric-thermal coupling global collaborative control when participating in grid frequency modulation and is difficult to realize stable and economic optimal frequency modulation is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of energy control technology, and in particular to a method, system and medium for frequency regulation optimization control of energy storage heat pumps. Background Technology

[0002] As new energy power generation continues to be integrated into the power system, the supporting capacity of traditional synchronous generator units is gradually weakening, and the stability of the power grid frequency places higher demands on the flexible adjustment of resources. Heat pump energy storage systems can use heat pumps to convert electrical energy into heat energy and store it through heat storage devices and heating networks. When needed, they can participate in power grid frequency regulation by adjusting the power consumption of the heat pump, while relying on the thermal inertia of the heating system to maintain the heating quality on the user side. Therefore, they have the potential to be used as a load-side frequency regulation resource.

[0003] In existing technologies, heat pumps and heating systems are mostly used for economical heating dispatch, renewable energy consumption, or local load regulation. The control process typically focuses on the individual optimization of the power or heating system. Some schemes rely on load disturbance measurements, local temperature signals, or preset steady-state operating points to achieve power allocation, making it difficult to fully reflect the coupling relationship between changes in heat pump power consumption and the dynamic temperature of the heating network. When heat pump energy storage systems participate in grid frequency regulation, rapid changes in heat pump power consumption will cause synchronous changes in heating power, thus affecting the thermal balance of the heating network. Without global coordinated control addressing the dynamic electro-thermal coupling, it is easy to lead to unreasonable allocation of frequency regulation power and heat source compensation power, resulting in transient imbalances in the heating system, insufficient control stability, and reduced operational economy. Therefore, when existing heat pump energy storage systems participate in grid frequency regulation, it is urgent to solve the problem of difficulty in achieving stable and economically optimal frequency regulation due to the lack of global coordinated control of electro-thermal coupling.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a method, system, and medium for frequency regulation optimization control of energy storage heat pumps, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for frequency regulation optimization control of energy storage in a heat pump, the method comprising: An electrothermal coupling model is established to characterize the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the heat pump energy storage unit. The frequency deviation signal of the power system and the temperature status information of the heating system are acquired, and the temperature characterization quantity of the entire heating system is determined based on the temperature status information. Using the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs, the frequency regulation power of the storage heat pump energy storage unit and the compensation power of the traditional heat source are determined. Based on the electrothermal coupling model, the frequency modulation power, and the compensation power, a collaborative power allocation without prior information is performed between the energy storage unit of the heat pump and the conventional heat source. Based on the results of the coordinated power allocation, the operation of the Chunuo heat pump energy storage unit and the conventional heat source is controlled, so that the Chunuo heat pump energy storage system participates in the frequency regulation of the power system and maintains the stable operation of the heating system.

[0007] Furthermore, an electrothermal coupling model is established, including: Based on the inertia of the bus unit, bus damping, bus frequency deviation, generator power deviation, power consumption deviation of the heat pump energy storage unit, conventional load deviation, and power transmission between buses, a frequency dynamic sub-model of the power system is established. Based on the heating network volume parameters, heating network topology coupling parameters, heating pipeline temperature deviation, heating node temperature deviation, traditional heat source heat power deviation, storage heat pump energy storage unit heating power deviation, and heat load deviation, a temperature dynamic sub-model of the heating system is established. Based on the performance coefficient of the heat pump energy storage unit, a thermoelectric conversion sub-model between the power consumption and heating power of the heat pump energy storage unit is established. The frequency dynamic sub-model, the temperature dynamic sub-model, and the thermoelectric conversion sub-model are coupled to obtain the electrothermal coupling model.

[0008] Furthermore, based on the temperature status information, the temperature characterization parameters of the entire heating system network are determined, including: Obtain temperature deviation information of heating pipes and heating nodes in the heating system, and obtain the volume parameters corresponding to the heating pipes and heating nodes; The temperature weighting of the heating system is determined based on the temperature deviation information and the volume parameters. The temperature-weighted values ​​are aggregated across the entire network, and the aggregated results are normalized based on the total volume of the heating system to obtain the temperature characterization values ​​of the entire heating system network. The temperature characteristics of the entire heating system are output as a global feedback signal to the control links of the Chunuo heat pump energy storage unit and the traditional heat source, so that the Chunuo heat pump energy storage unit and the traditional heat source can be controlled collaboratively based on the same global feedback signal.

[0009] Further, determining the frequency regulation power of the heat pump energy storage unit and the compensation power of the conventional heat source includes: The frequency deviation signal of the power system is collected through the distribution network bus and the frequency deviation signal is input into the heat pump dual-mode controller. The average temperature of the entire heating system is obtained through the network-wide temperature calculation module, and the average temperature of the entire heating system is input into the heat pump dual-mode controller and the traditional heat source control link. The frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in either frequency-sensitive load mode or converter linkage mode. The compensation power of the traditional heat source is generated based on the temperature characteristics of the entire heating system network, so that the traditional heat source can compensate for the heat power imbalance caused by the participation of the heat pump energy storage unit in frequency regulation. The heat storage device buffers the energy fluctuations in heating power caused by the adjustment of electrical power consumption in the heat pump energy storage unit.

[0010] Furthermore, the frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in frequency-sensitive load mode, including: The power consumption deviation of the heat pump energy storage unit is determined based on the frequency deviation signal and the heat pump power adjustment coefficient. The power consumption deviation is used as the frequency regulation power of the Chunuo heat pump energy storage unit, so that the power consumption of the Chunuo heat pump energy storage unit follows the frequency deviation signal. The heating power deviation of the heat pump energy storage unit is determined based on the power consumption deviation and the thermoelectric conversion relationship of the heat pump energy storage unit. The power consumption deviation is used to participate in the rapid frequency support of the power system, and the heating power deviation is used to maintain the thermal power balance of the heating system.

[0011] Furthermore, the frequency regulation power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in inverter linkage mode, including: Based on the temperature characterization of the entire heating system and the temperature feedback coefficient, determine the frequency control quantity of the heat pump energy storage unit. Based on the frequency control quantity and the electrothermal coupling model, the power consumption deviation and heating power deviation of the heat pump energy storage unit are determined. The power consumption deviation, generator power deviation, and conventional load deviation shall satisfy the power balance constraints. The heating power deviation, the traditional heat source heat power deviation, and the heat load deviation shall satisfy the heating power balance constraint. Under the constraints of power balance and heating power balance, the generator, the heat pump energy storage unit, and the conventional heat source are jointly allocated power.

[0012] Furthermore, the collaborative power allocation between the heat pump energy storage unit and the conventional heat source without prior information includes: Without acquiring load disturbance measurements and without presetting a steady-state equilibrium point, the generator frequency regulation control quantity is determined based on the frequency deviation signal, the generator time constant, and the reciprocal of the power generation cost coefficient. Without obtaining load disturbance measurements and without presetting a steady-state equilibrium point, the compensation power of the traditional heat source is determined based on the temperature characterization of the entire heating system, the time constant of the traditional heat source, and the reciprocal of the heating cost coefficient. According to the electrothermal coupling model, the frequency regulation control quantity of the generator, the frequency regulation power of the Cunuo heat pump energy storage unit, and the compensation power of the traditional heat source are incorporated into the optimization objective that includes power generation cost, heating cost, and Cunuo heat pump energy storage unit operating cost. Based on the optimization objective, the power balance constraint, the heating power balance constraint, and the thermoelectric conversion relationship, the result of the coordinated power allocation is obtained.

[0013] Furthermore, controlling the operation of the heat pump energy storage unit and the conventional heat source according to the result of the coordinated power allocation includes: The generator dynamics in the power system and the traditional heat source dynamics in the heating system are respectively represented as input strictly passive systems; By integrating the strictly passive input system into the electrothermal coupling model, a unified control framework compatible with high-order nonlinear dynamics is formed. Under the unified control framework, the frequency modulation power and the compensation power are updated in real time according to the cooperative control input; The operation of the Chunuo heat pump energy storage unit and the conventional heat source is controlled according to the real-time updated frequency regulation power and the compensation power, so that the Chunuo heat pump energy storage system maintains global asymptotic stability when participating in the power system frequency regulation.

[0014] A frequency regulation and optimization control system for energy storage heat pumps, the system comprising: The electrothermal coupling modeling module establishes an electrothermal coupling model that characterizes the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the energy storage unit of the heat pump. The temperature characterization determination module acquires the frequency deviation signal of the power system and the temperature status information of the heating system, and determines the temperature characterization quantity of the entire heating system network based on the temperature status information. The frequency regulation compensation determination module uses the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs to determine the frequency regulation power of the Chunuo heat pump energy storage unit and the compensation power of the traditional heat source. The no-priority allocation module performs collaborative power allocation between the Chunuo heat pump energy storage unit and the traditional heat source without prior information, based on the electrothermal coupling model, frequency modulation power, and compensation power. The stable operation control module controls the operation of the Chunuo heat pump energy storage unit and the traditional heat source based on the results of coordinated power allocation, enabling the Chunuo heat pump energy storage system to participate in power system frequency regulation and maintain the stable operation of the heating system.

[0015] A computer-readable storage medium stores a computer program, the computer program including program instructions that, when executed by a processor, can implement the aforementioned energy storage frequency regulation optimization control method for heat pumps.

[0016] The technical solution of this invention can achieve the following technical effects: By establishing an electrothermal coupling model of the relationship between power system frequency dynamics, heating system temperature dynamics, and the thermoelectric conversion of heat pump energy storage, and using frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs, the heat pump frequency regulation power and the traditional heat source compensation power are determined. Under the conditions of no load disturbance measurement and no preset steady-state equilibrium point, collaborative power allocation is carried out, which effectively solves the problem that existing heat pump energy storage systems lack global collaborative control oriented to electrothermal coupling dynamics when participating in grid frequency regulation, making it difficult to achieve safe, stable, and economically optimal frequency regulation.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating a frequency regulation optimization control method for a heat pump energy storage system. Figure 2 A schematic diagram of the overall architecture for the Chunuo heat pump energy storage system to participate in grid frequency regulation; Figure 3 This is a block diagram of the coupled dynamic model of the power system and the thermal system. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Example 1; like Figure 1 As shown, this application provides a frequency regulation optimization control method for energy storage heat pumps, the method comprising: S10: Establish an electrothermal coupling model characterizing the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the heat pump energy storage unit. S20: Acquire the frequency deviation signal of the power system and the temperature status information of the heating system, and determine the temperature characterization quantity of the entire heating system network based on the temperature status information; S30: Using the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs, determine the frequency regulation power of the Chunuo heat pump energy storage unit and the compensation power of the traditional heat source. S40: Based on the electrothermal coupling model, frequency modulation power, and compensation power, perform collaborative power allocation between the Chunuo heat pump energy storage unit and the traditional heat source without prior information; S50: Based on the results of coordinated power allocation, control the operation of the Chunuo heat pump energy storage unit and the traditional heat source, so that the Chunuo heat pump energy storage system can participate in the frequency regulation of the power system and maintain the stable operation of the heating system.

[0023] Specifically, this embodiment provides a control and power distribution method for a Chunuo heat pump energy storage system to participate in grid frequency regulation. The Chunuo heat pump energy storage system includes a Chunuo heat pump energy storage unit, a heat storage device, a heating system, a conventional heat source, and a coordinating controller. The Chunuo heat pump energy storage unit is connected to the load side of the power system and participates in the frequency regulation of the power system by changing the power consumption. At the same time, it supplies heat to the heating system through heating power. The conventional heat source is used to compensate for the heat power deviation in the heating system. During implementation, an electrothermal coupling model is first established to characterize the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the Chunuo heat pump energy storage unit. Specifically, based on the frequency deviation, generator power variation, conventional load variation, power consumption variation of the Chunuo heat pump energy storage unit, and power exchange relationship between buses in the power system, the frequency dynamic relationship of the power system is established; based on the pipe temperature, node temperature, heat load, heat power of traditional heat sources, and heating power of the Chunuo heat pump energy storage unit in the heating system, the temperature dynamic relationship of the heating system is established; based on the performance coefficient of the Chunuo heat pump energy storage unit, the thermoelectric conversion relationship between the power consumption and heating power of the Chunuo heat pump energy storage unit is established, thus obtaining an electrothermal coupling model that can simultaneously reflect the frequency variation on the power side and the temperature variation on the heating side. Subsequently, the frequency deviation signal of the power system and the temperature status information of the heating system are collected. The frequency deviation signal can be obtained by the frequency measurement device at the distribution network bus. The temperature status information can include the temperature of the heating pipeline, the temperature of the heating node, or temperature deviation information that can characterize the thermal status of the heating system. The co-controller determines the temperature characterization of the entire heating system based on the temperature status information. The temperature characterization of the entire heating system is used to reflect the overall thermal status of the heating system, rather than just the temperature status of local measuring points. Subsequently, using the frequency deviation signal and the temperature characterization of the entire heating system as inputs for coordinated control, the frequency regulation power of the Chunuo heat pump energy storage unit and the compensation power of the traditional heat source are determined. Specifically, when a frequency deviation occurs in the power system, the coordinated controller determines the power consumption that the Chunuo heat pump energy storage unit needs to adjust based on the frequency deviation signal, enabling the Chunuo heat pump energy storage unit to participate in grid frequency regulation as an adjustable load. At the same time, the coordinated controller determines the compensation power of the traditional heat source based on the temperature characterization of the entire heating system, enabling the traditional heat source to compensate for the changes in heating power caused by the adjustment of power consumption of the Chunuo heat pump energy storage unit. Then, based on the electrothermal coupling model, frequency regulation power, and compensation power, a collaborative power allocation without prior information is performed between the Chunuo heat pump energy storage unit and the traditional heat source. Specifically, the collaborative controller does not need to obtain the load disturbance in advance, nor does it need to preset the steady-state equilibrium point. Instead, it dynamically determines the power allocation relationship between the Chunuo heat pump energy storage unit and the traditional heat source based on the real-time frequency deviation signal, the temperature characterization of the entire heating system, and the electrothermal coupling model. This ensures that the Chunuo heat pump energy storage unit meets the frequency regulation requirements of the power system and that the traditional heat source maintains the thermal power balance of the heating system. Finally, the operation of the Chunuo heat pump energy storage unit and the traditional heat source is controlled based on the results of the coordinated power allocation. Specifically, the coordinated controller sends a power consumption adjustment command to the Chunuo heat pump energy storage unit, causing the Chunuo heat pump energy storage unit to change its power consumption to participate in the power system frequency regulation. At the same time, the coordinated controller sends a heat power compensation command to the traditional heat source, causing the traditional heat source to compensate for the heat power imbalance caused by the Chunuo heat pump energy storage unit's participation in frequency regulation. Thus, the Chunuo heat pump energy storage system can maintain the stable operation of the heating system while participating in the power system frequency regulation, avoiding temperature imbalance in the heating system caused by rapid adjustment of heat pump power.

[0024] The technical solution of this invention establishes an electrothermal coupling model of the relationship between the power system frequency dynamics, the heating system temperature dynamics, and the thermoelectric conversion of the heat pump energy storage. Using the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs, the heat pump frequency regulation power and the traditional heat source compensation power are determined. Collaborative power allocation is carried out under the conditions of no load disturbance measurement and no preset steady-state equilibrium point. This effectively solves the problem that existing heat pump energy storage systems lack global collaborative control oriented to electrothermal coupling dynamics when participating in grid frequency regulation, which makes it difficult to achieve safe, stable, and economically optimal frequency regulation.

[0025] Furthermore, establishing an electrothermal coupling model includes: A frequency dynamic sub-model of the power system is established based on the inertia of the bus unit, bus damping, bus frequency deviation, generator power deviation, power consumption deviation of the heat pump energy storage unit, conventional load deviation, and power transmission between buses. Based on the heating network volume parameters, heating network topology coupling parameters, heating pipeline temperature deviation, heating node temperature deviation, traditional heat source heat power deviation, storage heat pump energy storage unit heating power deviation, and heat load deviation, a temperature dynamic sub-model of the heating system is established. Based on the performance coefficient of the Chunuo heat pump energy storage unit, a thermoelectric conversion sub-model between the power consumption and heating power of the Chunuo heat pump energy storage unit is established. By coupling the frequency dynamics sub-model, the temperature dynamics sub-model, and the thermoelectric conversion sub-model, an electrothermal coupling model is obtained.

[0026] Furthermore, based on temperature status information, determine the temperature characteristics of the entire heating system network, including: Obtain temperature deviation information of heating pipes and heating nodes in the heating system, and obtain the corresponding volume parameters of heating pipes and heating nodes; The temperature weighting of the heating system is determined based on temperature deviation information and volume parameters. The temperature-weighted values ​​are aggregated across the entire network, and the aggregated results are normalized based on the total volume of the heating system to obtain the temperature characterization values ​​of the entire heating system network. The temperature characteristics of the entire heating system are output as a global feedback signal to the control links of the Chunuo heat pump energy storage unit and the traditional heat source, so that the Chunuo heat pump energy storage unit and the traditional heat source can be controlled collaboratively based on the same global feedback signal.

[0027] Furthermore, determining the frequency regulation power of the heat pump energy storage unit and the compensation power of the traditional heat source includes: The frequency deviation signal of the power system is collected through the distribution network bus and input into the heat pump dual-mode controller. The average temperature of the entire heating system is obtained through the network-wide temperature calculation module, and the average temperature of the entire heating system is input into the heat pump dual-mode controller and the traditional heat source control link. The frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in either frequency-sensitive load mode or converter linkage mode. The compensation power of the traditional heat source is generated based on the temperature characteristics of the entire heating system network, so that the traditional heat source can compensate for the heat power imbalance caused by the participation of the heat pump energy storage unit in frequency regulation. The heat storage device buffers the energy fluctuations in heating power caused by the adjustment of electrical power consumption in the heat pump energy storage unit.

[0028] Furthermore, the frequency-regulating power generated by the heat pump dual-mode controller in frequency-sensitive load mode for the energy storage unit of the heat pump includes: The power consumption deviation of the Chunuo heat pump energy storage unit is determined based on the frequency deviation signal and the heat pump power regulation coefficient. The power consumption deviation is used as the frequency regulation power of the Chunuo heat pump energy storage unit, so that the power consumption of the Chunuo heat pump energy storage unit follows the frequency deviation signal. The heating power deviation of the Chunuo heat pump energy storage unit is determined based on the power consumption deviation and the thermoelectric conversion relationship of the Chunuo heat pump energy storage unit. Based on the deviation of power consumption, it participates in the rapid frequency support of the power system, and based on the deviation of heating power, it maintains the thermal power balance of the heating system.

[0029] Furthermore, the frequency-regulating power generated by the heat pump dual-mode controller in inverter linkage mode for the energy storage unit of the heat pump includes: Based on the temperature characteristics and temperature feedback coefficient of the entire heating system network, determine the frequency control quantity of the Chunuo heat pump energy storage unit; Based on the frequency control quantity and the electrothermal coupling model, the power consumption deviation and heating power deviation of the Chunuo heat pump energy storage unit are determined. The power balance constraint is satisfied by using power deviation, generator power deviation and conventional load deviation; To ensure that the deviation in heating power, the deviation in heat power from traditional heat sources, and the deviation in heat load meet the heating power balance constraints; Under the constraints of power balance and heating power balance, a joint power allocation is carried out among the generator, the heat pump energy storage unit, and the traditional heat source.

[0030] Furthermore, the collaborative power allocation between the heat pump energy storage unit and the traditional heat source without prior information includes: Without obtaining load disturbance measurements and without presetting a steady-state equilibrium point, the generator frequency regulation control quantity is determined based on the frequency deviation signal, the generator time constant, and the reciprocal of the generation cost coefficient. Without obtaining load disturbance measurements and without presetting a steady-state equilibrium point, the compensation power of the traditional heat source is determined based on the temperature characterization of the entire heating system, the time constant of the traditional heat source, and the reciprocal of the heating cost coefficient. Based on the electrothermal coupling model, the frequency regulation control quantity of the generator, the frequency regulation power of the Cunuo heat pump energy storage unit, and the compensation power of the traditional heat source are incorporated into the optimization objective, which includes the power generation cost, heating cost, and operating cost of the Cunuo heat pump energy storage unit. Based on the optimization objective, power balance constraints, heating power balance constraints, and thermoelectric conversion relationships, the results of coordinated power allocation are obtained.

[0031] Furthermore, controlling the operation of the heat pump energy storage unit and the conventional heat source according to the results of coordinated power allocation includes: The dynamics of generators in the power system and the dynamics of traditional heat sources in the heating system are respectively represented as strictly passive input systems; By integrating the strictly passive input system into the electrothermal coupling model, a unified control framework compatible with high-order nonlinear dynamics is formed. Under the unified control framework, the frequency modulation power and compensation power are updated in real time based on the collaborative control input; The operation of the Chunuo heat pump energy storage unit and the traditional heat source is controlled according to the real-time updated frequency regulation power and compensation power, so that the Chunuo heat pump energy storage system can maintain global asymptotic stability when participating in power system frequency regulation.

[0032] As a preferred embodiment of the above embodiments, the present invention is used for primary frequency regulation of low-inertia power systems, enabling the energy storage system of the heat pump to participate safely, stably, and optimally in grid frequency regulation on the load side, while ensuring the heating quality for users and achieving coordinated optimization of electric and thermal multi-energy flows: such as Figure 2 and Figure 3 As shown, Figure 2This diagram illustrates the overall architecture of the Chunuo heat pump energy storage system participating in primary frequency regulation of the power grid. It mainly includes: a large power grid system, a distribution network bus, a dual-mode heat pump controller, a Chunuo heat pump unit, a thermal storage device, a district heating network, traditional heat sources, and a network-wide average temperature calculation module. The large power grid outputs a frequency deviation signal ω, which is collected by the distribution network bus and sent to the dual-mode heat pump controller. The controller drives the Chunuo heat pump to adjust the power consumption and heating power, while the thermal storage device performs energy buffering. The district heating network ensures heating for users, and the network-wide average temperature calculation module outputs a global temperature signal T, which, in conjunction with traditional heat sources, achieves stable electrothermal control. Figure 3 This is a block diagram of a dynamic model of the coupling of a power system and a thermal system. The left side is the dynamic module of the power system, which establishes the dynamic relationship between unit inertia, damping, frequency deviation, power generation, heat pump power consumption, and conventional load. The middle part is the thermoelectric coupling link of the heat pump, which realizes the mapping between electrical power and thermal power through the heating power output (COP) that the heat pump can output per unit of electrical power consumed. The right side is the dynamic module of the thermal system, which establishes the dynamic relationship between heating network temperature, traditional heat sources, heat pump heating power, and heat load, and fully describes the operating mechanism of the electro-thermal coupling system. (1) System modeling: 1) Dynamic model of power system; Bus frequency dynamics: ; In the formula busbar Unit inertia busbar Damping coefficient, busbar Frequency deviation, busbar The first derivative of frequency deviation with respect to time For generator power deviation, For the deviation in electrical power consumption of heat pump energy storage, This is a normal load deviation. This refers to the power transmitted between bus i and j; Dynamic model of thermal system; Heating network temperature dynamics: ; In the formula This is the volume matrix of the heating network pipes and nodes. This represents the temperature deviation vector of the heating pipeline. This is the first derivative of the temperature deviation vector of the heating pipeline with respect to time. The first derivative of the temperature deviation vector at the heating node with respect to time. This represents the temperature deviation vector at the heating node. This is the topology coupling matrix of the heating network. This is due to the deviation in heat power from a conventional heat source. For the deviation in heat pump heating power, This is the heat load deviation vector; 3) Thermoelectric coupling relationship of heat pump; ; In the formula The coefficient of performance (COP) of a heat pump is a storage heat pump (usually a constant). The heating power of the heat pump is j. The power consumption of the heat pump is j; Core control mechanism; Define the weighted average temperature of the heating system as the global control signal: ; by As a global control signal, it uniformly drives the traditional heat source to compensate for the thermal power imbalance caused by the frequency regulation of the heat pump energy storage, achieving synchronous coordination across the entire network; among which The average temperature of the entire heating network. For the total thermal energy stored in the system, This refers to the total volume of the heating system. Generator and heat source control law; Generator frequency control: ; Traditional heat source control: ; In the formula It is a time constant. , which is the reciprocal of the power generation cost coefficient. This is the reciprocal of the heating cost coefficient, achieving optimal allocation based on cost. Let be the active power deviation of the j-th generator. This is the first derivative of the active power deviation with respect to time. Let the thermal power deviation of the j-th traditional heat source be . This is the first derivative of the thermal power deviation with respect to time. (4) Two modes of heat pump participation in frequency regulation; Mode 1: Frequency-sensitive load mode (fast frequency adjustment): The heat pump power directly follows the bus frequency deviation: ; in, For the deviation of electrical power used in heat pump energy storage; Let be the frequency response coefficient of the j-th heat pump energy storage unit under frequency-sensitive load mode; Let be the frequency deviation of the j-th bus; its characteristics are the fastest response, direct following of the frequency deviation, optimal allocation between the power grid and the heating network, and suitability for rapid support; Mode 2: Inverter linkage mode (globally optimal); The frequency of a heat pump is determined by the average temperature. ; Power balance constraints: ; in, The frequency deviation of the j-th bus; The average temperature of the entire heating network; This refers to the power transmitted between bus i and j; This refers to the power transmitted between bus j and k; its characteristics include achieving optimal power-heat distribution across the entire power and heat network, optimal economic efficiency, more stable transients, and suitability for long-term optimal scheduling. (5) High-order dynamic compatibility extension; The generator / traditional heat source is represented as a strictly passive input system, which is compatible with high-order nonlinear dynamics and ensures that the system remains stable and optimally distributed under high-order dynamics. Power-side generating units: ; Heat source on the thermal side: ; In the formula, Let j be the state variable of the j-th power-side unit. The first derivative of the power unit's state variables with respect to time; Let j be the state dynamic function of the j-th power-side unit; The output function of the j-th power-side unit; The frequency deviation of the j-th bus; Let be the active power deviation of the j-th generator; Let j be the state variable of the j-th heat source on the thermal side. This is the first derivative of the state variables of the heat source on the thermal side with respect to time. Let be the state dynamic function of the j-th heat source on the thermal side; Let j be the output function of the heat source on the thermal side; It serves as a measure of the temperature across the entire heating network. The thermal power deviation of the j-th conventional heat source; the subscript e indicates the power side, h indicates the heat side, j indicates the number of the corresponding unit or heat source, the superscript s indicates the system state variable, and the superscript G indicates the conventional generator or conventional heat source; (6) Optimality conditions (steady-state equivalent optimization); Mode 1, Power-side optimization: ; Mode 1, Thermal Optimization: ; Mode 2, Electric-Heat Joint Optimization: ; in, This is the generator power deviation vector; The power deviation vector of the energy storage unit of the heat pump; This is the normal load power deviation vector; This is the vector of power load disturbance or power load demand deviation. This is a matrix of power generation cost coefficients; This is a matrix of heating cost coefficients; Cost coefficient matrix for adjusting power consumption of the Chunuo heat pump energy storage unit; This is the cost coefficient matrix for conventional load adjustment; Let be the temperature feedback coefficient of the j-th heat pump energy storage unit; Let be the thermoelectric conversion coefficient of the j-th heat pump energy storage unit.

[0033] Example 2; Based on the same inventive concept as the frequency regulation optimization control method for a heat pump energy storage system described in the foregoing embodiments, this invention also provides a frequency regulation optimization control system for a heat pump energy storage system, the system comprising: The electrothermal coupling modeling module establishes an electrothermal coupling model that characterizes the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the energy storage unit of the heat pump. The temperature characterization determination module acquires the frequency deviation signal of the power system and the temperature status information of the heating system, and determines the temperature characterization quantity of the entire heating system network based on the temperature status information. The frequency regulation compensation determination module uses the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs to determine the frequency regulation power of the Chunuo heat pump energy storage unit and the compensation power of the traditional heat source. The no-priority allocation module performs collaborative power allocation between the Chunuo heat pump energy storage unit and the traditional heat source without prior information, based on the electrothermal coupling model, frequency modulation power, and compensation power. The stable operation control module controls the operation of the Chunuo heat pump energy storage unit and the traditional heat source based on the results of coordinated power allocation, enabling the Chunuo heat pump energy storage system to participate in power system frequency regulation and maintain the stable operation of the heating system.

[0034] The system described above in this invention can effectively realize a frequency regulation optimization control method for energy storage heat pumps, and the technical effects it can achieve are as described in the above embodiments, which will not be repeated here.

[0035] Example 3; Based on the same inventive concept as the frequency regulation optimization control method for energy storage of a heat pump in the foregoing embodiments, the present invention also provides a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, can realize the frequency regulation optimization control method for energy storage of a heat pump.

[0036] Although this application has been described in conjunction with specific features and embodiments, it is apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and accompanying drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application is intended to include such modifications and modifications.

Claims

1. A frequency regulation optimization control method for energy storage heat pumps, characterized in that, The method includes: An electrothermal coupling model is established to characterize the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the heat pump energy storage unit. The frequency deviation signal of the power system and the temperature status information of the heating system are acquired, and the temperature characterization quantity of the entire heating system is determined based on the temperature status information. Using the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs, the frequency regulation power of the storage heat pump energy storage unit and the compensation power of the traditional heat source are determined. Based on the electrothermal coupling model, the frequency modulation power, and the compensation power, a collaborative power allocation without prior information is performed between the energy storage unit of the heat pump and the conventional heat source. Based on the results of the coordinated power allocation, the operation of the Chunuo heat pump energy storage unit and the conventional heat source is controlled, so that the Chunuo heat pump energy storage system participates in the frequency regulation of the power system and maintains the stable operation of the heating system.

2. The energy storage frequency regulation optimization control method for a heat pump according to claim 1, characterized in that, Establish an electrothermal coupling model, including: Based on the inertia of the bus unit, bus damping, bus frequency deviation, generator power deviation, power consumption deviation of the heat pump energy storage unit, conventional load deviation, and power transmission between buses, a frequency dynamic sub-model of the power system is established. Based on the heating network volume parameters, heating network topology coupling parameters, heating pipeline temperature deviation, heating node temperature deviation, traditional heat source heat power deviation, storage heat pump energy storage unit heating power deviation, and heat load deviation, a temperature dynamic sub-model of the heating system is established. Based on the performance coefficient of the heat pump energy storage unit, a thermoelectric conversion sub-model between the power consumption and heating power of the heat pump energy storage unit is established. The frequency dynamic sub-model, the temperature dynamic sub-model, and the thermoelectric conversion sub-model are coupled to obtain the electrothermal coupling model.

3. The energy storage frequency regulation optimization control method for a heat pump according to claim 1, characterized in that, Based on the temperature status information, determine the temperature characteristics of the entire heating system network, including: Obtain temperature deviation information of heating pipes and heating nodes in the heating system, and obtain the volume parameters corresponding to the heating pipes and heating nodes; The temperature weighting of the heating system is determined based on the temperature deviation information and the volume parameters. The temperature-weighted values ​​are aggregated across the entire network, and the aggregated results are normalized based on the total volume of the heating system to obtain the temperature characterization values ​​of the entire heating system network. The temperature characteristics of the entire heating system are output as a global feedback signal to the control links of the Chunuo heat pump energy storage unit and the traditional heat source, so that the Chunuo heat pump energy storage unit and the traditional heat source can be controlled collaboratively based on the same global feedback signal.

4. The energy storage frequency regulation optimization control method for a heat pump according to claim 1, characterized in that, Determining the frequency regulation power of the heat pump energy storage unit and the compensation power of the conventional heat source includes: The frequency deviation signal of the power system is collected through the distribution network bus and the frequency deviation signal is input into the heat pump dual-mode controller. The average temperature of the entire heating system is obtained through the network-wide temperature calculation module, and the average temperature of the entire heating system is input into the heat pump dual-mode controller and the traditional heat source control link. The frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in either frequency-sensitive load mode or converter linkage mode. The compensation power of the traditional heat source is generated based on the temperature characteristics of the entire heating system network, so that the traditional heat source can compensate for the heat power imbalance caused by the participation of the heat pump energy storage unit in frequency regulation. The heat storage device buffers the energy fluctuations in heating power caused by the adjustment of electrical power consumption in the heat pump energy storage unit.

5. The energy storage frequency regulation optimization control method for a heat pump according to claim 4, characterized in that, The frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in frequency-sensitive load mode, including: The power consumption deviation of the heat pump energy storage unit is determined based on the frequency deviation signal and the heat pump power adjustment coefficient. The power consumption deviation is used as the frequency regulation power of the Chunuo heat pump energy storage unit, so that the power consumption of the Chunuo heat pump energy storage unit follows the frequency deviation signal. The heating power deviation of the heat pump energy storage unit is determined based on the power consumption deviation and the thermoelectric conversion relationship of the heat pump energy storage unit. The power consumption deviation is used to participate in the rapid frequency support of the power system, and the heating power deviation is used to maintain the thermal power balance of the heating system.

6. The frequency regulation optimization control method for energy storage heat pumps according to claim 4, characterized in that, The frequency-regulating power of the heat pump energy storage unit is generated by the heat pump dual-mode controller in inverter linkage mode, including: Based on the temperature characterization of the entire heating system and the temperature feedback coefficient, determine the frequency control quantity of the heat pump energy storage unit. Based on the frequency control quantity and the electrothermal coupling model, the power consumption deviation and heating power deviation of the heat pump energy storage unit are determined. The power consumption deviation, generator power deviation, and conventional load deviation shall satisfy the power balance constraints. The heating power deviation, the traditional heat source heat power deviation, and the heat load deviation shall satisfy the heating power balance constraint. Under the constraints of power balance and heating power balance, the generator, the heat pump energy storage unit, and the conventional heat source are jointly allocated power.

7. The energy storage frequency regulation optimization control method for a heat pump according to claim 1, characterized in that, The collaborative power allocation between the heat pump energy storage unit and the conventional heat source without prior information includes: Without acquiring load disturbance measurements and without presetting a steady-state equilibrium point, the generator frequency regulation control quantity is determined based on the frequency deviation signal, the generator time constant, and the reciprocal of the power generation cost coefficient. Without obtaining load disturbance measurements and without presetting a steady-state equilibrium point, the compensation power of the traditional heat source is determined based on the temperature characterization of the entire heating system, the time constant of the traditional heat source, and the reciprocal of the heating cost coefficient. According to the electrothermal coupling model, the frequency regulation control quantity of the generator, the frequency regulation power of the Cunuo heat pump energy storage unit, and the compensation power of the traditional heat source are incorporated into the optimization objective that includes power generation cost, heating cost, and Cunuo heat pump energy storage unit operating cost. Based on the optimization objective, the power balance constraint, the heating power balance constraint, and the thermoelectric conversion relationship, the result of the coordinated power allocation is obtained.

8. The energy storage frequency regulation optimization control method for a heat pump according to claim 1, characterized in that, Controlling the operation of the heat pump energy storage unit and the conventional heat source according to the result of the coordinated power allocation includes: The generator dynamics in the power system and the traditional heat source dynamics in the heating system are respectively represented as input strictly passive systems; By integrating the strictly passive input system into the electrothermal coupling model, a unified control framework compatible with high-order nonlinear dynamics is formed. Under the unified control framework, the frequency modulation power and the compensation power are updated in real time according to the cooperative control input; The operation of the Chunuo heat pump energy storage unit and the conventional heat source is controlled according to the real-time updated frequency regulation power and the compensation power, so that the Chunuo heat pump energy storage system maintains global asymptotic stability when participating in the power system frequency regulation.

9. A frequency regulation and optimization control system for energy storage heat pumps, characterized in that, The system includes: The electrothermal coupling modeling module establishes an electrothermal coupling model that characterizes the frequency dynamics of the power system, the temperature dynamics of the heating system, and the thermoelectric conversion relationship of the energy storage unit of the heat pump. The temperature characterization determination module acquires the frequency deviation signal of the power system and the temperature status information of the heating system, and determines the temperature characterization quantity of the entire heating system network based on the temperature status information. The frequency regulation compensation determination module uses the frequency deviation signal and the temperature characterization of the entire heating system as collaborative control inputs to determine the frequency regulation power of the Chunuo heat pump energy storage unit and the compensation power of the traditional heat source. The no-priority allocation module performs collaborative power allocation between the Chunuo heat pump energy storage unit and the traditional heat source without prior information, based on the electrothermal coupling model, frequency modulation power, and compensation power. The stable operation control module controls the operation of the Chunuo heat pump energy storage unit and the traditional heat source based on the results of coordinated power allocation, enabling the Chunuo heat pump energy storage system to participate in power system frequency regulation and maintain the stable operation of the heating system.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which includes program instructions that, when executed by a processor, can implement the energy storage frequency regulation optimization control method for the heat pump as described in any one of claims 1-8.

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