Electricity-heat-steam coupling thermal power generating unit and source load storage resource cooperative control method, system and equipment and storage medium

Abstract

The invention discloses an electricity-heat-steam coupling thermal power generating unit and source load storage resource cooperative control method, system and device and a storage medium, and the method comprises the steps: building an electricity-heat-steam coupling model of a thermal power generating unit at a dispatching master station end AGC, and then carrying out the online calculation of the regulation capability of the thermal power generating unit based on the electricity-heat-steam coupling model. The adjustment range and the control target of the electric-heat-steam coupling thermal power generating unit are optimized in real time, cooperative optimization control of the coupling thermal power generating unit and the source load storage resources is combined, heat supply and steam supply of the thermal power generating unit are guaranteed, meanwhile, the AGC control effect is improved, and the win-win situation of a power grid, a power plant and resident life is achieved.

Description

Technical Field

[0001] This invention relates to the field of active power control in power systems, and more particularly to a method, system, equipment, and storage medium for coordinated control of electric-heat-steam coupled thermal power units and source-load-storage resources. Background Technology

[0002] With the deepening of energy transition and the rapid increase in the proportion of new energy sources, the role of thermal power units is gradually shifting from a single power supply entity to a "ballast" for power system security and a comprehensive regional multi-energy regulation resource. Especially under the multi-energy coupling pattern aimed at clean heating, energy conservation and emission reduction, and flexible regulation, thermal power units often need to coordinate power generation, heating, and steam supply, exhibiting typical electricity-heat-steam coupling characteristics. The operating mechanism lies in the fact that the steam generated after fuel combustion is both the power source for the turbine and an important energy carrier for heating and industrial steam use. Through steam extraction at different pressure levels, thermal power units can simultaneously undertake residential heating and industrial steam supply, but this inevitably affects the unit's electrical power output, forming a complex energy distribution and constraint relationship. It is precisely this natural coupling that makes thermal power units not merely regarded as regulation units of the power grid, but must be incorporated into the comprehensive control framework as an important component of the multi-energy system.

[0003] In recent years, scholars have established more refined unit coupling models based on thermodynamic mechanisms and the law of conservation of energy, quantitatively describing the distribution mechanism of steam at different pressures and its impact on power output. These models not only provide theoretical support for the dynamic operation characteristic analysis of units but also lay the foundation for subsequent optimized scheduling and flexibility enhancement. Based on this, the academic community has proposed various optimized control methods, such as multi-objective optimization strategies, model predictive control methods, and hierarchical and zonal control frameworks, to simultaneously consider the frequency stability of the power system and the temperature and pressure stability of the thermal system. Some studies have even collaboratively modeled electricity, heat, steam, energy storage, and new energy sources to explore new integrated scheduling models at the regional level. Looking to the future, the development trend of electricity-heat-steam coupling control technology exhibits characteristics of intelligence, systematization, and decarbonization.

[0004] The technology of coupled electricity-heat-steam regulation in thermal power units is moving from theoretical research to engineering applications, expanding from single-unit optimization to integrated scheduling of multi-energy systems. Future focus lies in establishing more refined and dynamic coupling models, developing regulation algorithms that balance real-time performance and global optimization, and combining new energy sources, energy storage, and demand response to achieve multi-energy coordinated scheduling, thus constructing a clean and efficient new model for heating and steam supply. Current multi-energy coupled source-grid-load-storage coordinated control systems mainly achieve optimized scheduling at the day-ahead to intraday planning level. At the real-time control level, they primarily rely on scheduling plans or manual setting of unit regulation boundaries by dispatchers, balancing AGC unit regulation capabilities with heating and steam supply guarantee requirements. This approach not only lacks precision in the control process and significantly interferes with dispatchers' daily work, but also fails to accurately grasp the regulation capabilities of thermal power units, affecting the effectiveness of AGC control. Summary of the Invention

[0005] Objective of this invention: The objective of this invention is to provide a method for precise AGC control and regulation of thermal power units, integrating electric-heat-steam coupled thermal power units with source-load-storage resources, while ensuring the supply of heat and steam to the thermal power units. Another objective of this invention is to provide a control system, equipment, and storage medium for electric-heat-steam coupled thermal power units integrating source-load-storage resources.

[0006] Technical solution: The method for coordinated control of electric-heat-steam coupled thermal power units and source-load-storage resources described in this invention includes establishing an electric-heat-steam coupled model of the thermal power unit at the dispatch master station AGC.

[0007] Based on the actual active power, real-time steam supply, real-time heating, and upper and lower limits of output, steam flow rate, and heating temperature of the electric-heat-steam coupled thermal power unit, an active real-time control model for the electric-heat-steam coupled thermal power unit is constructed. The active real-time control model includes AGC regulation capability parameters, heating regulation constraint parameters, and steam supply regulation constraint parameters.

[0008] Based on the heating requirements, current heating status, steam extraction requirements, and current steam extraction status of the thermal power unit in the electric-thermal-steam coupling model, calculate the effective regulation capacity of the heating supply and the effective regulation capacity of the steam supply of the thermal power unit under electric-thermal coupling, respectively.

[0009] The dispatch master station's AGC obtains the advance adjustment demand for thermal power unit output within a preset time period based on the changes in new energy power.

[0010] Based on the grid's demand for renewable energy consumption, electric-heat-steam coupled thermal power units will be jointly used with renewable energy and energy storage regulation resources to participate in real-time peak shaving;

[0011] Based on the grid frequency control requirements, the power-heat-steam coupled thermal power units, energy storage, and conventional hydro-thermal power units will jointly participate in real-time frequency regulation.

[0012] The dispatching master station AGC performs real-time control of the electric-heat-steam coupled thermal power units, monitors the real-time output, heating / steam supply status and grid frequency of the thermal power units, and performs safety control and regulation.

[0013] Furthermore, the effective regulation capability of the thermal power unit's heating supply under electro-thermal coupling is calculated, as follows:

[0014] The boundary function for the feasible region of electro-thermal coupling is

[0015] P e =αQ h +β

[0016] In the formula: P e Where Q is the power generation capacity (in MW), α is the electro-thermal coupling coefficient, and Q is the thermal coupling coefficient. h For heat supply, β is the compensation amount;

[0017] Piecewise linearization of the boundary function of the feasible region of electro-thermal coupling yields the ideal output levels under different heating levels:

[0018] P e-i =α i Q h-i +β i

[0019] In the formula: P e-i Let α be the ideal power generation capacity under the i-th heating level segment. i Let Q be the electro-thermal coupling coefficient for the i-th heating level segment. h-i For the heat supply of the i-th heating level segment, β i This is the compensation amount for the i-th heating level segment;

[0020] Calculate the power generation limit required to meet current heating demands:

[0021]

[0022] In the formula: P e-i-max P represents the maximum power generation output at the i-th heating level. e-i-min Q represents the minimum output at the i-th heating level. h-i-max Q represents the maximum heat output at the i-th heating level. h-i-min Minimum heat supply under the first heating level.

[0023] Furthermore, the effective regulation capability of the gas supply of the thermal power unit under electric-steam coupling is calculated as follows:

[0024] Based on the extraction-back pressure characteristic curve of the thermal power unit, the coupling relationship between power generation and extraction steam in the electric-steam coupled thermal power unit is obtained:

[0025] P = P max -kT

[0026] In the formula: P is the maximum power generation output under extraction conditions, P max K is the rated output of the unit, K is the power generation-steam extraction coefficient, and T is the steam extraction rate.

[0027] Linearizing the extraction-backpressure characteristic curve of the thermal power unit yields the power output adjustment range of the electric-steam coupled thermal power unit under a given extraction level.

[0028]

[0029] In the formula: P i-max P represents the maximum output at the i-th extraction level. i-min T represents the minimum output at the i-th extraction level. i-max T represents the maximum extraction rate at the i-th extraction level. i-min This represents the minimum extraction steam rate at the i-th extraction level.

[0030] Furthermore, the dispatch master station AGC obtains the advance adjustment demand of thermal power unit output within a preset time period based on the changes in new energy power, which is divided into upward adjustment demand and downward adjustment demand.

[0031] When the advance adjustment demand is the upward adjustment demand, the thermal power units that require increased unit output after the heating-steam coupling are selected first. The adjustment demand is allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit does not exceed the upper limit of the adjustable trend range. The remaining part is then allocated to the adjustable load to reduce the power load of the adjustable load and meet the advance control target in the whole.

[0032] When the advance adjustment demand is the downward adjustment demand, the adjustable load that has already reduced its power load is selected first. The power demand of the increased load is restored to the normal power consumption of the adjustable load. The remaining part is then allocated to the thermal power units that require reduced unit output after the heating-steam coupling. The adjustment demand is allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit does not exceed the lower limit of the adjustable trend range, so that the overall adjustable load and coupled thermal power units meet the advance control target.

[0033] Furthermore, based on the grid's demand for renewable energy consumption, power-heat-steam coupled thermal power units will be jointly integrated with renewable energy and energy storage regulation resources to participate in real-time peak shaving, as detailed below:

[0034] Based on the regulation and reserve status of conventional hydropower units, the dispatch master station AGC calculates the regulation demand for power-heat-steam coupled thermal power units and peak-shaving resources such as new energy and energy storage.

[0035] Based on the peak-shaving demand, the heating and steam supply trends of the electric-heat-steam coupled thermal power units and the charging and discharging trends of the energy storage are determined. When the energy storage needs to be charged, it is first used to charge the energy storage to meet the peak-shaving demand, and the remaining portion is allocated to the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand. When the energy storage does not need to be charged, the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand are used first to reduce their output, and the remaining portion is used by the energy storage to reduce its output to meet the grid's peak-shaving demand.

[0036] Furthermore, based on the grid frequency control requirements, the regulation resources of the electric-heat-steam coupled thermal power units, energy storage, and conventional hydro-thermal power units will be jointly used in real-time frequency regulation, as detailed below:

[0037] The AGC at the dispatch master station calculates the current frequency regulation demand of the power grid based on real-time grid frequency, tie-line power, and plans. Based on the grid frequency regulation demand, it determines the direction and urgency of frequency regulation adjustment and optimizes the allocation of various resources.

[0038] When the grid regulation demand is urgent, energy storage and conventional units are called up first for regulation, and the remaining part is undertaken by electric-thermal-steam coupled thermal power units. The remaining regulation demand is allocated among multiple electric-thermal-steam coupled thermal power units using a proportional allocation strategy based on the available regulation range, increasing the probability that the regulation demand can be fully allocated.

[0039] When the grid regulation demand is not urgent, the magnitude and direction of the deviation between the current output of the electric-heat-steam coupled thermal power unit and the ideal output of the heating-steam supply are analyzed. The regulation demand is first used to restore the output of the electric-heat-steam coupled thermal power unit to the ideal output. Then, the regulation demand is allocated to the energy storage units that deviate from the energy storage charging and discharging plan. The remaining part is allocated to the conventional hydro-thermal power units.

[0040] Furthermore, the dispatch master station's AGC performs real-time control of the electric-thermal-steam coupled thermal power units, monitors the real-time output, heating / steam supply status, and grid frequency of the thermal power units, and performs safety control adjustments, as detailed below:

[0041] When the heating temperature of the electric-thermal-steam coupled unit is higher or lower than the temperature threshold range, the AGC at the dispatch master station will urgently adjust the real-time output of the coupled thermal power unit to adjust the output of the coupled unit to the ideal output target as quickly as possible.

[0042] When the steam supply flow rate and steam supply pressure in the electric-thermal-steam coupled thermal power unit are higher or lower than the steam supply threshold range, the dispatch master station AGC will urgently adjust the real-time output of the coupled thermal power unit to adjust the output of the coupled unit to the ideal output target as quickly as possible until the steam supply flow rate and steam supply pressure meet the steam supply requirements.

[0043] When the electric-thermal-steam coupled unit returns to the ideal output target and the grid frequency is in an emergency state, the control command to lock the grid frequency is locked until the grid frequency returns to the normal range.

[0044] The electric-thermal-steam coupled thermal power unit and source-load-storage resource coordinated control system of the present invention includes:

[0045] The coupling model construction module is used to establish the electric-thermal-steam coupling model of the thermal power unit at the AGC of the scheduling master station.

[0046] The control model construction module is used to construct the active real-time control model of the electric-heat-steam coupled thermal power unit based on the actual active power, real-time steam supply, real-time heating, and upper and lower limits of output, steam flow, and heating temperature. The active real-time control model includes AGC regulation capability parameters, heating regulation constraint parameters, and steam supply regulation constraint parameters.

[0047] The calculation module is used to calculate the effective regulation capacity of the heating supply of the thermal power unit under the electric-thermal coupling and the effective regulation capacity of the gas supply of the thermal power unit under the electric-thermal coupling, based on the heating requirements, current heating status, steam extraction requirements and current steam extraction status of the thermal power unit in the electric-thermal-steam coupling model.

[0048] The advance adjustment demand solving module is used to schedule the master station AGC to obtain the advance adjustment demand of thermal power unit output within a preset time period based on the changes in new energy power.

[0049] The peak shaving module is used to combine electric-heat-steam coupled thermal power units with new energy and energy storage regulation resources to participate in real-time peak shaving according to the grid's demand for new energy consumption;

[0050] The frequency regulation module is used to combine the regulation resources of electric-thermal-steam coupled thermal power units with energy storage and conventional hydro-thermal power units to participate in real-time frequency regulation according to the grid frequency control requirements;

[0051] The control and regulation module is used to schedule the master station AGC to perform real-time control of the electric-heat-steam coupled thermal power unit, monitor the real-time output, heating / steam supply status and grid frequency of the thermal power unit, and perform safety control and regulation.

[0052] The computer device of this invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above method.

[0053] The computer-readable storage medium of the present invention stores a computer program thereon, which, when executed by a processor, implements the steps of the above-described method.

[0054] Beneficial effects: Compared with the prior art, the significant advantages of this invention are: This invention establishes an electric-heat-steam coupling model at the dispatch master station AGC, proposes an online calculation method for the regulation capacity of thermal power units based on the electric-heat-steam coupling model, optimizes the regulation range and control target of conventional thermal power units in real time, and combines the coordinated control of thermal power units with source-load-storage resources to improve the coordinated control capability of the power grid source-grid-load-storage. While ensuring the supply of heat and steam to thermal power units, it optimizes the control effect of AGC, supports the safe consumption of new energy, and achieves a win-win situation for the power grid, power plants and residents. Detailed Implementation

[0055] The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources described in this invention includes:

[0056] (1) Construct Automatic Generation Control (AGC) function in the provincial dispatch center (hereinafter referred to as the provincial dispatch). Establish frequency and tie-line control areas in the AGC system. The control objectives of the frequency and tie-line control areas are to maintain the frequency of the power grid within the control range, or to maintain the power exchange between this control area and other adjacent control areas at a given planned value, or to satisfy both of the above control objectives simultaneously.

[0057] (2) Establish conventional hydropower and thermal power unit control objects in AGC, and also establish virtual machine groups of different types of resources such as source, load and storage. The overall idea is to convert the aggregated load-side resources into an equivalent load-side type virtual regulation object to participate in grid regulation and control; and to use grid-side energy storage as a new type of adjustable object to participate in grid regulation and control. For conventional hydropower, thermal power, energy storage and adjustable load control objects, the existing control model and control parameters are used for modeling.

[0058] (3) For electric-thermal-steam coupled thermal power units, the main aspects of establishing model information for coupled thermal power units include:

[0059] (31) Physical attribute information of electric-heat-steam coupled thermal power units: including equipment name, rated heating capacity, maximum heating capacity, minimum heating capacity, maximum steam pressure, minimum steam pressure, steam flow rate, highest heating temperature, lowest heating temperature, etc.

[0060] (32) Measurement data of electric-heat-steam coupled thermal power unit model: including real-time power generation active power, real-time heating capacity, heating pressure, steam pressure, steam temperature, real-time upward / downward adjustment limit of thermal power, allowable heating range, allowable steam range, etc.

[0061] (4) After the main station AGC accesses the real-time measurement data of the electric-heat-steam coupled thermal power unit, based on the actual active power value, real-time steam supply, real-time heating and output upper and lower limits, steam flow upper and lower limits, heating temperature upper and lower limits, etc. collected in the above steps, the active real-time control model of the electric-heat-steam coupled thermal power unit is constructed, which is divided into AGC regulation capability parameters, heating regulation constraint parameters and steam supply regulation constraint parameters.

[0062] (41) The AGC regulation capability parameter model of the electric-heat-steam coupled thermal power unit control model includes: the rated regulation capability of thermal power, the current upper limit of regulation of thermal power unit, the current lower limit of regulation of thermal power unit, the current output and heating ratio coefficient, and the current output and steam ratio coefficient.

[0063] (42) The heating regulation constraint parameters of the control model of the electric-heat-steam coupled thermal power unit include: the highest heating temperature, the lowest heating temperature, the current heating temperature, and the correlation coefficient between heating temperature and output.

[0064] (43) The steam supply regulation constraint parameters of the control model of the electric-heat-steam coupled thermal power unit include: the maximum steam supply flow rate, the minimum heating flow rate, the current steam supply flow rate, and the correlation coefficient between the steam supply flow rate and the output.

[0065] (5) For thermal power units with electro-thermal coupling, the effective adjustment range of the thermal power unit under electro-thermal coupling is calculated in real time based on the heating requirements and current heating situation of the thermal power unit. The calculation method is as follows:

[0066] (51) According to the boundary function of the feasible region of electro-thermal coupling, as shown in equation (1):

[0067] P e =αQ h +β (1)

[0068] In the formula: P e Where Q is the power generation capacity (in MW), α is the electro-thermal coupling coefficient (MWh / GJ), and Q is the thermal coupling coefficient. h β represents the heat supply (GJ / h) and the compensation amount (MW).

[0069] (52) Based on the piecewise linearization of the feasible domain boundary function of the electro-thermal coupling, the ideal output levels under different heating levels are obtained as shown in Equation (2):

[0070] P e-i =α i Q h-i +β i (2)

[0071] In the formula: P e-i Let α be the ideal power generation capacity (in MW) under the i-th heating level segment. iLet Q be the electro-thermal coupling coefficient (MWh / GJ) for the i-th heating level segment. h-i β represents the heat supply for the i-th heating level segment. i This is the compensation amount for the i-th heating level segment.

[0072] (53) After piecewise linearization based on the boundary function of the feasible region of electro-thermal coupling, the power generation limit requirement to meet the current heating requirements can be calculated according to the reasonable range of heat supply. The calculation method is as follows:

[0073]

[0074] In the formula: P e-i-max P represents the maximum power generation output at the i-th heating level. e-i-min Q represents the minimum output at the i-th heating level. h-i-max Q represents the maximum heat output at the i-th heating level. h-i-min Minimum heat supply under the first heating level.

[0075] (6) For electric-steam coupled thermal power units, the effective adjustment range of the thermal power unit under electric-steam coupling is calculated in real time based on the extraction steam requirements and current extraction steam conditions. The calculation method is as follows:

[0076] (61) Based on the extraction-back pressure characteristic curve of the thermal power unit, the power generation and extraction coupling relationship of the electric-steam coupled thermal power unit is obtained, as shown in equation (4):

[0077] P = P max -kT (4)

[0078] In the formula: P is the maximum power generation output under extraction conditions, P max K represents the rated output of the unit, K is the power generation-extraction coefficient (MWh / t), and T is the extraction steam rate (t / h).

[0079] (62) Linearize the extraction-back pressure characteristic curve of the thermal power unit to obtain the power output adjustment range of the electric-steam coupled thermal power unit under a given extraction level. The calculation method is shown in Equation (5):

[0080]

[0081] In the formula: P i-max P represents the maximum output at the i-th extraction level. i-min T represents the minimum output at the i-th extraction level. i-max T represents the maximum extraction rate at the i-th extraction level. i-min This represents the minimum extraction steam rate at the i-th extraction level.

[0082] (7) For thermal power units that supply both heat and steam, the adjustment range that the unit can meet the requirements of heat supply and steam supply needs to be calculated according to equations (3) and (5) respectively, and the intersection is taken to obtain the final adjustment range that can participate in the AGC control of the main station. If the intersection is an empty set, the unit adjustment status is determined to be abnormal, an abnormal alarm is issued and the plant terminal is notified to exit AGC control.

[0083] (8) After obtaining the method for calculating the adjustable capacity of the electric-heat-steam coupled thermal power unit, the adjustable trend range after the heating-steam coupling in the next 5 minutes to one hour can be calculated according to the heating-steam supply plan of the electric-heat-steam coupled thermal power unit. Based on this adjustable trend range, the electric-heat-steam coupled thermal power unit can participate in different control scenarios as needed.

[0084] (9) Based on the rapid ramp-up demand of new energy sources in the power grid, power-heat-steam coupled thermal power units can be jointly involved in advanced control with adjustable load resources. The specific strategies are as follows:

[0085] (91) The main station AGC obtains the unit output advance adjustment demand for the next 5-15 minutes based on the rapid change of new energy power, which is divided into upward adjustment demand and downward adjustment demand.

[0086] (92) If it is an upward adjustment demand, prioritize thermal power units that require increased unit output after heating-steam coupling. The adjustment demand is allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit does not exceed the upper limit of the adjustable trend range. The remaining part is then allocated to the adjustable load to reduce the power load of the adjustable load and meet the overall advanced control target.

[0087] (93) If it is a downward adjustment demand, priority should be given to the adjustable load that has already reduced its power load. The power demand of the increased load should be restored to the normal power demand of the adjustable load. The remaining part should be allocated to the thermal power units that require reduced unit output after the heating-steam coupling. The adjustment demand should be allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit should not exceed the lower limit of the adjustable trend range, so as to make the overall adjustable load and coupled thermal power units meet the advanced control target as much as possible.

[0088] (10) Based on the grid's demand for renewable energy consumption, power-heat-steam coupled thermal power units can also be combined with renewable energy, energy storage and other regulating resources to participate in real-time peak shaving. The specific strategies are as follows:

[0089] (101) The main station AGC first calculates the regulation demand of the electric-heat-steam coupled thermal power unit and peak-shaving resources such as new energy and energy storage based on the regulation and standby status of conventional hydro-thermal power units.

[0090] (102) Based on the obtained peak-shaving demand, determine the heating and steam supply trends of the electric-heat-steam coupled thermal power units, as well as the charging and discharging trends of the energy storage. If the energy storage needs to be charged, prioritize the charging of the energy storage to meet the peak-shaving demand, and allocate the remaining portion to the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand (i.e., require reduced output). If the energy storage does not need to be charged, prioritize the reduction of output of the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand (i.e. require reduced output), and allocate the remaining portion to the energy storage to reduce output to meet the grid peak-shaving demand.

[0091] (11) Based on the grid frequency control requirements, the electric-heat-steam coupled thermal power units can also be combined with energy storage, conventional hydro-thermal units and other regulation resources to participate in real-time frequency regulation. The main station AGC calculates the current frequency regulation requirements of the grid in real time based on the grid frequency, tie line power and plan. Based on the grid frequency regulation requirements, the regulation direction and urgency of the frequency regulation requirements are then determined to optimize the allocation of various resources:

[0092] (111) If the grid regulation demand is urgent, then energy storage and conventional units should be used for regulation first, and the remaining part should be undertaken by electric-heat-steam coupled thermal power units. The remaining regulation demand should be allocated among multiple electric-heat-steam coupled thermal power units using the available regulation range ratio allocation strategy to ensure that the regulation demand can be fully allocated.

[0093] (112) If the grid regulation demand is not large, first analyze the magnitude and direction of the deviation between the current output of the electric-heat-steam coupled thermal power unit and the ideal output of the heating-steam supply. Prioritize the use of regulation demand to restore the output of the electric-heat-steam coupled thermal power unit to the ideal output. Then allocate the regulation demand to the energy storage unit that deviates from the energy storage charging and discharging plan, and allocate the remaining part to the conventional hydro-thermal power unit.

[0094] (12) When the main station AGC performs real-time control on the electric-heat-steam coupled thermal power unit, it simultaneously monitors the real-time output, heating and steam supply status of the corresponding thermal power unit and the grid frequency operation for safety control and adjustment. The specific strategies are as follows:

[0095] (121) If the heating temperature of the electric-heat-steam coupling unit is too high or too low, the main station AGC will urgently adjust the real-time output of the coupling thermal power unit to adjust the output of the coupling unit to the ideal output target at the fastest rate.

[0096] (122) If the steam supply flow rate and steam supply pressure in the electric-heat-steam coupled thermal power unit are too high or too low, the main station AGC will urgently adjust the real-time output of the coupled thermal power unit to adjust the output of the coupled unit to the ideal output target at the fastest rate until the steam supply flow rate and steam supply pressure meet the steam supply requirements.

[0097] (123) When the electric-thermal-steam coupled unit returns to the ideal output target, if the grid frequency is in an emergency state, the control command that further deteriorates the grid frequency will be automatically blocked until the grid frequency returns to the normal range.

[0098] The electric-thermal-steam coupled thermal power unit and source-load-storage resource coordinated control system of the present invention includes:

[0099] The coupling model construction module is used to establish the electric-thermal-steam coupling model of the thermal power unit at the AGC of the scheduling master station.

[0100] The control model construction module is used to construct the active real-time control model of the electric-heat-steam coupled thermal power unit based on the actual active power, real-time steam supply, real-time heating, and upper and lower limits of output, steam flow, and heating temperature. The active real-time control model includes AGC regulation capability parameters, heating regulation constraint parameters, and steam supply regulation constraint parameters.

[0101] The calculation module is used to calculate the effective regulation capacity of the heating supply of the thermal power unit under the electric-thermal coupling and the effective regulation capacity of the gas supply of the thermal power unit under the electric-thermal coupling, based on the heating requirements, current heating status, steam extraction requirements and current steam extraction status of the thermal power unit in the electric-thermal-steam coupling model.

[0102] The advance adjustment demand solving module is used to schedule the master station AGC to obtain the advance adjustment demand of thermal power unit output within a preset time period based on the changes in new energy power.

[0103] The peak shaving module is used to combine electric-heat-steam coupled thermal power units with new energy and energy storage regulation resources to participate in real-time peak shaving according to the grid's demand for new energy consumption;

[0104] The frequency regulation module is used to combine the regulation resources of electric-thermal-steam coupled thermal power units with energy storage and conventional hydro-thermal power units to participate in real-time frequency regulation according to the grid frequency control requirements;

[0105] The control and regulation module is used to schedule the master station AGC to perform real-time control of the electric-heat-steam coupled thermal power unit, monitor the real-time output, heating / steam supply status and grid frequency of the thermal power unit, and perform safety control and regulation.

[0106] The computer device of this invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above method.

[0107] The computer-readable storage medium of the present invention stores a computer program thereon, which, when executed by a processor, implements the steps of the above-described method.

Claims

1. A method for coordinated control of an electric-thermal-steam coupled thermal power unit and source-load-storage resources, characterized in that, include A coupling model of the electric-thermal-steam power unit is established at the AGC terminal of the dispatch master station; Based on the actual active power, real-time steam supply, real-time heating, and upper and lower limits of output, steam flow rate, and heating temperature of the electric-heat-steam coupled thermal power unit, an active real-time control model for the electric-heat-steam coupled thermal power unit is constructed. The active real-time control model includes AGC regulation capability parameters, heating regulation constraint parameters, and steam supply regulation constraint parameters. Based on the heating requirements, current heating status, steam extraction requirements, and current steam extraction status of the thermal power unit in the electric-thermal-steam coupling model, calculate the effective regulation capacity of the heating supply and the effective regulation capacity of the steam supply of the thermal power unit under electric-thermal coupling, respectively. The dispatch master station's AGC obtains the advance adjustment demand for thermal power unit output within a preset time period based on the changes in new energy power. Based on the grid's demand for renewable energy consumption, electric-heat-steam coupled thermal power units will be jointly used with renewable energy and energy storage regulation resources to participate in real-time peak shaving; Based on the grid frequency control requirements, the power-heat-steam coupled thermal power units, energy storage, and conventional hydro-thermal power units will jointly participate in real-time frequency regulation. The dispatching master station AGC performs real-time control of the electric-heat-steam coupled thermal power units, monitors the real-time output, heating / steam supply status and grid frequency of the thermal power units, and performs safety control and regulation.

2. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, The effective regulation capability of thermal power units under electro-thermal coupling is calculated as follows: The boundary function for the feasible region of electro-thermal coupling is P e =αQ h +β In the formula: P e Where Q is the power generation capacity (in MW), α is the electro-thermal coupling coefficient, and Q is the thermal coupling coefficient. h For heat supply, β is the compensation amount; Piecewise linearization of the boundary function of the feasible region of electro-thermal coupling yields the ideal output levels under different heating levels: P e-i =a i Q h-i +b i In the formula: P e-i Let α be the ideal power generation capacity under the i-th heating level segment. i Let Q be the electro-thermal coupling coefficient for the i-th heating level segment. h-i For the heat supply of the i-th heating level segment, β i This is the compensation amount for the i-th heating level segment; Calculate the power generation limit required to meet current heating demands: In the formula: P e-i-max P represents the maximum power generation output at the i-th heating level. e-i-min Q represents the minimum output at the i-th heating level. h-i-max Q represents the maximum heat output at the i-th heating level. h-i-min Minimum heat supply under the first heating level.

3. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, The effective regulation capability of the gas supply of a thermal power unit under electric-steam coupling is calculated as follows: Based on the extraction-back pressure characteristic curve of the thermal power unit, the coupling relationship between power generation and extraction steam in the electric-steam coupled thermal power unit is obtained: P=P max -kT In the formula: P is the maximum power generation output under extraction conditions, P max K is the rated output of the unit, K is the power generation-steam extraction coefficient, and T is the steam extraction rate. Linearizing the extraction-backpressure characteristic curve of the thermal power unit yields the power output adjustment range of the electric-steam coupled thermal power unit under a given extraction level. In the formula: P i-max P represents the maximum output at the i-th extraction level. i-min T represents the minimum output at the i-th extraction level. i-max T represents the maximum extraction rate at the i-th extraction level. i-min This represents the minimum extraction steam rate at the i-th extraction level.

4. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, Based on the changes in new energy power, the dispatch master station AGC obtains the advance adjustment demand of thermal power unit output within a preset time period in the future, which is divided into upward adjustment demand and downward adjustment demand. When the advance adjustment demand is the upward adjustment demand, the thermal power units that require increased unit output after the heating-steam coupling are selected first. The adjustment demand is allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit does not exceed the upper limit of the adjustable trend range. The remaining part is then allocated to the adjustable load to reduce the power load of the adjustable load and meet the advance control target in the whole. When the advance adjustment demand is the downward adjustment demand, the adjustable load that has already reduced its power load is selected first. The power demand of the increased load is restored to the normal power consumption of the adjustable load. The remaining part is then allocated to the thermal power units that require reduced unit output after the heating-steam coupling. The adjustment demand is allocated according to the proportion of the center point of the adjustable trend range. The total allocation of each coupled unit does not exceed the lower limit of the adjustable trend range, so that the overall adjustable load and coupled thermal power units meet the advance control target.

5. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, Based on the grid's demand for renewable energy consumption, power-heat-steam coupled thermal power units will be jointly used with renewable energy and energy storage regulation resources to participate in real-time peak shaving, as detailed below: Based on the regulation and reserve status of conventional hydropower units, the dispatch master station AGC calculates the regulation demand for power-heat-steam coupled thermal power units and peak-shaving resources such as new energy and energy storage. Based on the peak-shaving demand, the heating and steam supply trends of the electric-heat-steam coupled thermal power units and the charging and discharging trends of the energy storage are determined. When the energy storage needs to be charged, it is first used to charge the energy storage to meet the peak-shaving demand, and the remaining portion is allocated to the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand. When the energy storage does not need to be charged, the electric-heat-steam coupled thermal power units whose heating and steam supply trends meet the peak-shaving demand are used first to reduce their output, and the remaining portion is used by the energy storage to reduce its output to meet the grid's peak-shaving demand.

6. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, Based on the grid frequency control requirements, the regulation resources of electric-thermal-steam coupled thermal power units, energy storage, and conventional hydro-thermal units will be jointly used in real-time frequency regulation, as detailed below: The AGC at the dispatch master station calculates the current frequency regulation demand of the power grid based on real-time grid frequency, tie-line power, and plans. Based on the grid frequency regulation demand, it determines the direction and urgency of frequency regulation adjustment and optimizes the allocation of various resources. When the grid regulation demand is urgent, energy storage and conventional units are called up first for regulation, and the remaining part is undertaken by electric-thermal-steam coupled thermal power units. The remaining regulation demand is allocated among multiple electric-thermal-steam coupled thermal power units using a proportional allocation strategy based on the available regulation range, increasing the probability that the regulation demand can be fully allocated. When the grid regulation demand is not urgent, the magnitude and direction of the deviation between the current output of the electric-heat-steam coupled thermal power unit and the ideal output of the heating-steam supply are analyzed. The regulation demand is first used to restore the output of the electric-heat-steam coupled thermal power unit to the ideal output. Then, the regulation demand is allocated to the energy storage units that deviate from the energy storage charging and discharging plan. The remaining part is allocated to the conventional hydro-thermal power units.

7. The method for coordinated control of electric-thermal-steam coupled thermal power units and source-load-storage resources according to claim 1, characterized in that, The dispatch master station's AGC performs real-time control of the electric-thermal-steam coupled thermal power units, monitors the real-time output, heating / steam supply status, and grid frequency of the units, and performs safety control adjustments, as detailed below: When the heating temperature of the electric-thermal-steam coupled unit is higher or lower than the temperature threshold range, the AGC at the dispatch master station will urgently adjust the real-time output of the coupled thermal power unit to adjust the output of the coupled unit to the ideal output target as quickly as possible. When the steam supply flow rate and steam supply pressure in the electric-thermal-steam coupled thermal power unit are higher or lower than the steam supply threshold range, the dispatch master station AGC will urgently adjust the real-time output of the coupled thermal power unit to adjust the output of the coupled unit to the ideal output target as quickly as possible until the steam supply flow rate and steam supply pressure meet the steam supply requirements. When the electric-thermal-steam coupled unit returns to the ideal output target and the grid frequency is in an emergency state, the control command to lock the grid frequency is locked until the grid frequency returns to the normal range.

8. A coordinated control system for an electric-thermal-steam coupled thermal power unit and source-load-storage resources, characterized in that, include The coupling model construction module is used to establish the electric-thermal-steam coupling model of the thermal power unit at the AGC of the scheduling master station. The control model construction module is used to construct the active real-time control model of the electric-heat-steam coupled thermal power unit based on the actual active power, real-time steam supply, real-time heating, and upper and lower limits of output, steam flow, and heating temperature. The active real-time control model includes AGC regulation capability parameters, heating regulation constraint parameters, and steam supply regulation constraint parameters. The calculation module is used to calculate the effective regulation capacity of the heating supply of the thermal power unit under the electric-thermal coupling and the effective regulation capacity of the gas supply of the thermal power unit under the electric-thermal coupling, based on the heating requirements, current heating status, steam extraction requirements and current steam extraction status of the thermal power unit in the electric-thermal-steam coupling model. The advance adjustment demand solving module is used to schedule the master station AGC to obtain the advance adjustment demand of thermal power unit output within a preset time period based on the changes in new energy power. The peak shaving module is used to combine electric-heat-steam coupled thermal power units with new energy and energy storage regulation resources to participate in real-time peak shaving according to the grid's demand for new energy consumption; The frequency regulation module is used to combine the regulation resources of electric-thermal-steam coupled thermal power units with energy storage and conventional hydro-thermal power units to participate in real-time frequency regulation according to the grid frequency control requirements; The control and regulation module is used to schedule the master station AGC to perform real-time control of the electric-heat-steam coupled thermal power unit, monitor the real-time output, heating / steam supply status and grid frequency of the thermal power unit, and perform safety control and regulation.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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