A method and system for absorbing new energy

Abstract

This invention provides a method and system for renewable energy consumption, comprising: inputting the predicted data of total power load, total heat load, and renewable energy unit output of the power system within a statistical period into a pre-constructed renewable energy consumption model to obtain the output of various units; summarizing the output of renewable energy units and combining it with the total power load of the period to determine the renewable energy consumption capacity; wherein, the renewable energy consumption model, considering generator unit operation constraints including conventional unit power output constraints and CHP unit thermoelectric coupling constraints, and power supply system balance constraints, adjusts the output of various units with the goal of minimizing the total system operating cost; through the renewable energy consumption model, the rationality of generator unit operation and the renewable energy consumption capacity are improved, and the impact of heating demand on CHP units and the peak-shaving capacity of the entire power system can be more realistically and accurately reflected, while providing more accurate and reliable analysis results of renewable energy consumption.

Description

Technical Field

[0001] This invention relates to the field of new energy grid connection technology in new energy power generation technology, specifically to a new energy consumption method and system. Background Technology

[0002] Figure 3 This paper presents the impact of renewable energy grid integration on the system from the perspective of power balance. As shown in the figure, electricity load is highly regular, and traditional thermal power units can effectively control their power output to achieve peak shaving. However, the introduction of renewable energy generation, characterized by randomness and intermittency, necessitates frequent adjustments of conventional energy sources to meet load demands through their peak-shaving capabilities. Most renewable energy installations are concentrated in high-latitude regions rich in wind resources. These regions experience a degree of power surplus, and existing thermal power units constitute a large proportion of CHP (Combined Heat and Power) units, lacking flexible traditional units that cannot quickly track the large, high-frequency random fluctuations of renewable energy. Especially during the winter heating season, when heat demand is high, combined heat and power units (CHP) units are largely absent from peak shaving due to heat-driven power generation, leading to a decrease in the system's peak-shaving capacity. Data released by power grids in frigid regions shows that CHP units account for a very high proportion of thermal power units, especially in high-latitude frigid areas. Therefore, the "thermal-electric coupling" of CHP units needs to be considered in the analysis of renewable energy consumption. This coupling relationship varies among different types of combined heat and power units. Summary of the Invention

[0003] Given the large proportion of CHP (Consumer-Powered) units and the poor peak-shaving capacity of the system, the "thermal-electric coupling" problem of CHP units needs to be considered during the renewable energy integration process. This invention provides a renewable energy integration method and system, specifically including:

[0004] The total electrical load, total heat load and output forecast data of the power system for each period within the statistical period are input into the pre-built renewable energy consumption model to obtain the output of various units for each period.

[0005] The output of new energy units at each time period within the cycle is summarized, and combined with the total electrical load of the cycle, the capacity for new energy absorption is determined.

[0006] The new energy consumption model, taking into account the constraints of generator unit operation and power supply system balance, aims to minimize the total system operating cost by adjusting the output of various generator units.

[0007] The generator set operating constraints include the electrical output constraints of conventional units and the thermoelectric coupling constraints of CHP units.

[0008] Preferably, the construction of the new energy consumption model includes:

[0009] To minimize the total operating cost of the system, an objective function is established.

[0010] Based on the characteristics of various generator units, construct generator unit operation constraints for the objective function;

[0011] Based on the characteristics of the power system, power supply system balance constraints are constructed for the objective function;

[0012] The constraints on generator unit operation include: power output constraints of conventional units, power output constraints and thermal output constraints of CHP units, constraints on power changes of conventional and CHP units, and power output constraints of new energy units; the constraints on power supply system balance include: power balance constraints and thermal balance constraints.

[0013] Preferably, the objective function is calculated as follows:

[0014]

[0015] Where z represents the total system operating cost, including fuel consumption costs and start-up and shutdown costs of the units; g1 represents the number of conventional units; g2 represents the number of CHP units; and g represents the total number of conventional and CHP units. Let be the fuel consumption cost of a conventional unit in the t-th time period. Let uc be the fuel consumption cost of the CHP generator set in the t-th time period. g,t DC is the cost of starting up the unit in the t-th time period. g,t This represents the cost of the unit being out of service during the t-th time period.

[0016] Preferably, the fuel consumption cost of the conventional unit in the t-th time period The calculation formula is as follows:

[0017]

[0018] in, This represents the operating status of a conventional generating unit during time period t. The basic cost for starting up the machine. Let be the electrical output of a conventional unit in the t-th time period. This is the fuel consumption cost coefficient for conventional generating units.

[0019] Preferably, the fuel consumption cost of the CHP unit in the t-th time period The calculation formula is as follows:

[0020]

[0021] Among them, u g2,t Let a be the operating status of the CHP unit in the t-th time period. g2The basic cost for starting up the machine. Let be the electrical output of the CHP unit in the t-th time period. Let be the thermal output of the CHP unit in the t-th time period. Due to the electrothermal coupling relationship of the CHP unit, the cost is affected by both electrical output and thermal output. This is the fuel consumption cost factor for the CHP unit.

[0022] Preferably, the electrical output constraint of the conventional unit is as shown in the following formula:

[0023]

[0024] in, Let be the electrical output of a conventional unit in the t-th time period. This represents the lower limit of the electrical output of conventional generating units. This is the upper limit of the electrical output of a conventional generating unit.

[0025] Preferably, the electrical output constraints and thermal output constraints of the CHP unit are as follows:

[0026]

[0027]

[0028] in, Let be the electrical output of the CHP unit in the t-th time period. This represents the lower limit of the electrical output of the CHP unit. This is the upper limit of the electrical output of the CHP unit. Let be the thermal output of the CHP unit in the t-th time period. This represents the lower limit of the thermal output of the CHP unit. This is the upper limit of the thermal output of the CHP unit.

[0029] Preferably, the constraints on the power variations of the conventional unit and the CHP unit are as follows:

[0030] Δp g,t ≤λP g

[0031] Where, Δp g,t Let P be the power variation of the conventional unit and the CHP unit in the t-th time period, λ be the ramp rate of the conventional unit and the CHP unit, and P be the power variation of the conventional unit and the CHP unit in the t-th time period. g This refers to the installed capacity of conventional units and CHP units.

[0032] Preferably, the power output constraint of the new energy unit is as shown in the following formula:

[0033] pw t ≤Pw

[0034] Among them, pw t Let Pw be the electrical output of the new energy unit in the t-th time period, and Pw be the installed capacity of the new energy unit.

[0035] Preferably, the power balance constraint is as shown in the following formula:

[0036]

[0037] Where, p g,t For the electrical output of the conventional unit and the CHP unit in the t-th time period, de t This represents the total electrical load of the power system.

[0038] Preferably, the thermodynamic balance constraint is as shown in the following equation:

[0039]

[0040] in, dh represents the thermal output of the CHP unit in the t-th time period. t This represents the total heat load of the power system.

[0041] Based on the same inventive concept, this invention provides a new energy consumption system, including: a unit output calculation module and an analysis module;

[0042] The unit output calculation module is used to input the total electrical load, total heat load and new energy unit output prediction data of the power system for each time period within the statistical period into the pre-constructed new energy consumption model to obtain the output of various units for each time period;

[0043] The analysis module is used to summarize the output of the new energy units in each period of the cycle, and combine it with the total electrical load of the cycle to determine the absorption capacity of new energy.

[0044] The new energy consumption model, taking into account the constraints of generator unit operation and power supply system balance, aims to minimize the total system operating cost by adjusting the output of various generator units.

[0045] The generator set operating constraints include the electrical output constraints of conventional units and the thermoelectric coupling constraints of CHP units.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] 1. The present invention provides a new energy consumption method comprising: inputting pre-acquired system total electrical load, total thermal load, and new energy unit output prediction data for each time period within a cycle into a pre-constructed new energy consumption model to obtain the output of various units in each time period; based on a certain cycle, summarizing the output of new energy units in each time period within the cycle, and combining it with the system total electrical load of the cycle to determine the new energy consumption capacity within the cycle; wherein, the new energy consumption model, considering generator unit operation constraints and power supply system balance constraints, adjusts the output of various units with the goal of minimizing the total system operating cost; wherein, the generator unit operation constraints, in addition to considering the electrical output constraints of conventional units, take into account the thermoelectric coupling constraints of CHP units; the present invention, through the new energy consumption method, improves the rationality of generator unit operation and the capacity for new energy consumption.

[0048] 2. The renewable energy consumption method provided by this invention not only considers the constraints of power balance, unit characteristics and reserve demand in the power system, but also fully considers the relevant constraints of the heating system, including thermal balance and the "thermal-electric coupling" of CHP units. The renewable energy consumption model can more realistically and accurately reflect the impact of heating demand on the peak-shaving capacity of CHP units and the entire power system, and can provide more accurate and reliable analysis results of renewable energy consumption. Attached Figure Description

[0049] Figure 1 A flowchart of the method provided by the present invention;

[0050] Figure 2 A schematic diagram of the structure of the new energy consumption model provided by this invention;

[0051] Figure 3 A schematic diagram illustrating the impact of renewable energy grid connection on the system from a power balance perspective;

[0052] Figure 4 This is a diagram showing the thermoelectric coupling relationship of a back-pressure CHP unit.

[0053] Figure 5 This is a diagram showing the thermoelectric coupling relationship of an exhaust-type CHP unit. Detailed Implementation

[0054] Example 1:

[0055] This invention discloses a method for renewable energy consumption, combined with Figure 1 The method flowchart is introduced, specifically including:

[0056] Step 1: Input the total electrical load, total heat load and new energy unit output forecast data of the power system for each time period within the statistical period into the pre-built new energy consumption model to obtain the output of various units for each time period;

[0057] Step 2: Summarize the output of the new energy units at each time period within the cycle, and combine it with the total electrical load of the cycle to determine the new energy absorption capacity.

[0058] Step 1 involves inputting the predicted total electrical load, total heat load, and output of renewable energy units for each time period within the statistical period into a pre-built renewable energy consumption model to obtain the output of various units for each time period. Specifically, this includes:

[0059] 1. The construction of the new energy consumption model, its structure is as follows: Figure 2 As shown, it specifically includes:

[0060] (1) Using a day as the cycle and an hour as the time period, the variables such as the start-up mode, unit electrical output, heating unit thermal output and new energy unit output for each time period are optimized. The objective function is established with the goal of minimizing the total system operating cost. The calculation formula of the objective function is as follows:

[0061]

[0062] Where z represents the total system operating cost, including fuel consumption costs and start-up and shutdown costs of the units; g1 represents the number of conventional units; g2 represents the number of CHP units; and g represents the total number of conventional and CHP units, where g = g1 + g2. Let be the fuel consumption cost of a conventional unit in the t-th time period. Let uc be the fuel consumption cost of the CHP generator set in the t-th time period. g,t DC is the cost of starting up the unit in the t-th time period. g,t This represents the cost of the unit being out of service during the t-th time period.

[0063] Fuel consumption cost of conventional units in time period t The calculation formula is as follows:

[0064]

[0065] The fuel cost in the formula consists of two parts: the first part is the constant term in the formula. This represents the operating status of a conventional generating unit in time period t, where 1 indicates the unit is running and 0 indicates it is shut down. This refers to the basic startup cost, meaning the cost incurred as soon as the unit starts generating electricity. This will incur fuel costs; the second part consists of primary and secondary terms. Let be the electrical output of a conventional unit in the t-th time period. This is a proportional coefficient for the fuel consumption costs of conventional generating units. This is represented as the unit output p g1,t The cost of this part is a quadratic function of the transformation, and it changes with the output of the random group.

[0066] Fuel consumption cost of CHP unit in time period t The calculation formula is as follows:

[0067]

[0068] The fuel cost in the formula consists of two parts: power generation fuel cost and heating fuel cost. The power generation fuel cost is the same as that of conventional thermal power units. The first part of the formula is a constant term, u. g2,t This represents the operating status of the CHP unit during time period t, where 1 indicates startup and 0 indicates shutdown. g2 This refers to the basic startup cost, which is the cost incurred as long as the unit starts generating electricity. g2,t =1 will result in fuel costs; the second part consists of linear and quadratic terms. Let be the electrical output of the CHP unit in the t-th time period. This is the proportional coefficient for fuel consumption costs of the CHP unit. This indicates that as the unit outputs... The cost is a quadratic function of the transformation, and this part of the cost changes with the output of the random unit. Heating costs are similar to power generation costs, but due to the thermoelectric coupling relationship of the CHP unit, there is also a portion of the cost affected by both electrical and thermal output. Let be the thermal output of the CHP unit in the t-th time period. This is the proportional coefficient for fuel consumption costs of the CHP unit. This indicates that the heating output is increasing. The cost is a quadratic function of the transformation, and this part changes with the change in the heating volume of the random group. The cost is affected by both electrical output and thermal output due to the electrothermal coupling relationship of the CHP unit.

[0069] As can be seen from equation (1), since new energy sources have no cost, they are not reflected in the objective function.

[0070] (2) Based on the characteristics of various generator units, construct generator unit operation constraints for the objective function, specifically including:

[0071] ①Electrical output constraints of conventional units:

[0072]

[0073] Conventional generator sets only generate electrical power; their electrical output is unrelated to heating. Let be the electrical output of a conventional unit in the t-th time period. This represents the lower limit of the electrical output of conventional generating units. This is the upper limit of the electrical output of a conventional generating unit.

[0074] ② Electrical output constraints and thermal output constraints of the CHP unit:

[0075]

[0076] Unlike conventional units, CHP (Combined Heat and Power) units have a coupled relationship between their electrical and thermal outputs; that is, while generating a certain amount of thermal output, they must also simultaneously generate a certain range of electrical output. Let be the electrical output of the CHP unit in the t-th time period. This represents the lower limit of the electrical output of the CHP unit. This is the upper limit of the electrical output of the CHP unit. Let be the thermal output of the CHP unit in the t-th time period. This represents the lower limit of the thermal output of the CHP unit. This represents the upper limit of the thermal output of the CHP unit. From the above two equations, it can be seen that the upper and lower limits of the electrical output of the CHP unit are functions of the thermal output for the corresponding time period, and the upper and lower limits of the thermal output are functions of the electrical output for the corresponding time period.

[0077] In addition, different CHP units have different thermoelectric coupling relationships, and their power supply... and heating The correlation of output is constrained by the following formula, specifically including:

[0078] The output characteristics of back pressure units are as follows Figure 4 As shown:

[0079]

[0080] Where Cb is the proportionality coefficient.

[0081] The output characteristics of the extraction unit are as follows Figure 5 As shown:

[0082]

[0083] in, Cv represents the installed capacity of the CHP unit, and Cv is the proportional coefficient.

[0084] ③ Constraints on power variation of conventional units and CHP units:

[0085] Δp g,t ≤λP g (8)

[0086] Where, Δp g,t Let P be the power variation of the conventional unit and the CHP unit in the t-th time period, λ be the ramp rate of the conventional unit and the CHP unit, and P be the power variation of the conventional unit and the CHP unit in the t-th time period. g This refers to the installed capacity of conventional units and CHP units.

[0087] ④ Power output constraints of new energy units:

[0088] pw t ≤Pw (9)

[0089] Among them, pw t Let Pw be the electrical output of the new energy unit in the t-th time period, and Pw be the installed capacity of the new energy unit.

[0090] (3) Based on the characteristics of the power system, establish power supply system balance constraints for the objective function, specifically including:

[0091] ① Power balance constraints:

[0092]

[0093] Where, p g,t For the electrical output of the conventional unit and the CHP unit in the t-th time period, de t This represents the total electrical load within the system.

[0094] ②Thermal equilibrium constraints:

[0095]

[0096] in, dh represents the thermal output of the CHP unit in the t-th time period. t This represents the total heat load within the system.

[0097] 2. Input the total electrical load, total heat load, and power output forecast data of the power system for each time period within the statistical period to obtain the power output of various units for each time period, specifically including:

[0098] (1) Input the total electrical load, total heat load, and power output forecast data of the power system for each period within the statistical period into the established new energy consumption model to determine the start-up and shutdown methods of conventional units and CHP units, specifically including:

[0099] ① Determine the start-up and shutdown method of the CHP units according to equations (11) and (3), that is, which CHP units to start first under the premise of meeting the maximum demand of the total heat load of the system and the economic optimization;

[0100] ② Determine the start-up and shutdown methods of conventional units based on the power output forecast data of new energy power plants and formula (4), that is, which conventional units should be started first under the premise of meeting the maximum demand of the total power load of the power system and the economic optimization.

[0101] (2) Based on the start-up and shutdown methods of the conventional and CHP units, adjust the output of various units for each time period, specifically including:

[0102] ① During a certain period, the heating demand is determined according to formula (11). Combined with formulas (6) and (7), the power output of the CHP unit is minimized while satisfying formula (5).

[0103] ②Based on the power output prediction data of the new energy power plant, combined with equation (10), the power output of the traditional unit is determined under the condition of satisfying equation (4). If equation (4) is not satisfied, the power output of the new energy unit needs to be reduced.

[0104] ③ When the system reduces the output of new energy to 0, but still cannot meet any of the constraints in equations (4)-(11), it is necessary to introduce start-up and shutdown costs in conjunction with the latter half of equation (1). When the maximum load demand is not met, it is a shortfall in power generation. In this case, it is necessary to start the unit with the lowest start-up and shutdown costs under the premise of meeting the minimum shortfall. When the minimum load demand is exceeded, it is a surplus power generation. In this case, it is necessary to shut down the unit with the lowest start-up and shutdown costs under the premise of reducing the surplus power generation.

[0105] ④ In the next period, in addition to satisfying the above formula constraints, it is also necessary to introduce the constraints of formulas (8) and (9).

[0106] Step 2: Summarize the output of the renewable energy units at each time period within the stated cycle, and combine this with the total electrical load of the stated cycle to determine the renewable energy absorption capacity, specifically including:

[0107] The output of new energy units is summarized in a daily cycle, from 0:00 to 24:00, and combined with the total power load of the power system on that day to determine the absorption capacity of new energy on that day.

[0108] Example 2:

[0109] Based on the same inventive concept, the present invention also provides a new energy consumption system, including: a unit output calculation module and an analysis module;

[0110] The unit output calculation module is used to input the total electrical load, total heat load and new energy unit output prediction data of the power system for each time period within the statistical period into the pre-constructed new energy consumption model to obtain the output of various units for each time period;

[0111] The analysis module is used to summarize the output of the new energy units in each period of the cycle, and combine it with the total electrical load of the cycle to determine the absorption capacity of new energy.

[0112] The new energy consumption model, taking into account the constraints of generator unit operation and power supply system balance, aims to minimize the total system operating cost by adjusting the output of various generator units.

[0113] The generator set operating constraints include the electrical output constraints of conventional units and the thermoelectric coupling constraints of CHP units.

[0114] The unit output calculation module includes: a model target submodule and a model constraint submodule;

[0115] The model objective submodule is used to establish an objective function with the goal of minimizing the total operating cost of the system.

[0116] The model constraint submodule is used to construct constraints for the objective function.

[0117] The model constraint submodule includes: a generator set operation constraint unit and a power supply system balance constraint unit;

[0118] The generator set operation constraint unit is used to construct generator set operation constraint conditions for the objective function based on the characteristics of different generator sets.

[0119] The operating constraints of the generator sets include: power output constraints of conventional generator sets, power output constraints and thermal output constraints of CHP generator sets, power variation constraints of conventional generator sets and CHP generator sets, and power output constraints of new energy generator sets.

[0120] The power supply system balance constraint unit is used to construct power supply system balance constraint conditions for the objective function based on the constraints in the power system.

[0121] The power supply system balance constraints include: power balance constraints and thermal balance constraints.

[0122] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0123] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0124] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0125] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0126] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A method for absorbing new energy sources, characterized in that, include: The total electrical load, total heat load and output forecast data of the power system for each period within the statistical period are input into the pre-built renewable energy consumption model to obtain the output of various units for each period. The output of new energy units at each time period within the cycle is summarized, and combined with the total electrical load of the cycle, the capacity for new energy absorption is determined. The new energy consumption model, taking into account the constraints of generator unit operation and power supply system balance, aims to minimize the total system operating cost by adjusting the output of various generator units. The generator set operating constraints include the power output constraints of conventional units and the thermoelectric coupling constraints of CHP units; The construction of the new energy consumption model includes: To minimize the total operating cost of the system, an objective function is established. Based on the characteristics of various generator units, construct generator unit operation constraints for the objective function; Based on the characteristics of the power system, power supply system balance constraints are constructed for the objective function; The operating constraints of the generator sets include: power output constraints of conventional units, power output constraints and thermal output constraints of CHP units, constraints on power changes of conventional and CHP units, and power output constraints of new energy units; the power supply system balance constraints include: power balance constraints and thermal balance constraints. The objective function is calculated as follows: Where z represents the total system operating cost, including fuel consumption costs and start-up and shutdown costs of the units; g1 represents the number of conventional units; g2 represents the number of CHP units; and g represents the total number of conventional and CHP units. Let be the fuel consumption cost of a conventional unit in the t-th time period. Let uc be the fuel consumption cost of the CHP generator set in the t-th time period. g,t DC is the cost of starting up the unit in the t-th time period. g,t The cost of the unit being out of service during the t-th time period; The electrical output constraints and thermal output constraints of the CHP unit are shown in the following formulas: in, Let be the electrical output of the CHP unit in the t-th time period. This represents the lower limit of the electrical output of the CHP unit. This is the upper limit of the electrical output of the CHP unit. Let be the thermal output of the CHP unit in the t-th time period. This represents the lower limit of the thermal output of the CHP unit. This is the upper limit of the thermal output of the CHP unit; The fuel consumption cost of the CHP unit in the t-th time period The calculation formula is as follows: Among them, u g2,t Let a be the operating status of the CHP unit in the t-th time period. g2 The basic cost for starting up the machine. Let be the electrical output of the CHP unit in the t-th time period. Let be the thermal output of the CHP unit in the t-th time period. Due to the electrothermal coupling relationship of the CHP unit, the cost is affected by both electrical output and thermal output. This refers to the fuel consumption cost coefficient for the CHP unit. The CHP units include back-pressure units and extraction units; The output characteristics of a back-pressure unit are shown in the following formula: Where Cb is the proportionality coefficient; The output characteristics of the extraction turbine unit are shown in the following formula: in, Cv represents the installed capacity of the CHP unit, and Cv is the proportional coefficient.

2. The method as described in claim 1, characterized in that, The fuel consumption cost of the conventional unit in the t-th time period The calculation formula is as follows: in, This represents the operating status of a conventional generating unit during time period t. The basic cost for starting up the machine. Let be the electrical output of a conventional unit in the t-th time period. This is the fuel consumption cost coefficient for conventional generating units.

3. The method as described in claim 1, characterized in that, The electrical output constraint of the conventional unit is shown in the following formula: in, Let be the electrical output of a conventional unit in the t-th time period. This represents the lower limit of the electrical output of conventional generating units. This is the upper limit of the electrical output of a conventional generating unit.

4. The method as described in claim 1, characterized in that, The constraints on the power variations of the conventional units and CHP units are shown in the following formula: Δp g,t ≤λP g Where, Δp g,t Let P be the power variation of the conventional unit and the CHP unit in the t-th time period, λ be the ramp rate of the conventional unit and the CHP unit, and P be the power variation of the conventional unit and the CHP unit in the t-th time period. g This refers to the installed capacity of conventional units and CHP units.

5. The method as described in claim 4, characterized in that, The power output constraint of the new energy unit is shown in the following formula: pw t ≤Pw Among them, pw t Let Pw be the electrical output of the new energy unit in the t-th time period, and Pw be the installed capacity of the new energy unit.

6. The method as described in claim 5, characterized in that, The power balance constraint is shown in the following formula: Where, p g,t For the electrical output of the conventional unit and the CHP unit in the t-th time period, de t This represents the total electrical load of the power system.

7. The method as described in claim 6, characterized in that, The thermodynamic balance constraint is shown in the following equation: in, dh represents the thermal output of the CHP unit during the t-th time period. t This represents the total heat load of the power system.

8. A new energy consumption system, characterized in that, include: Unit output calculation and analysis modules; The unit output calculation module is used to input the total electrical load, total heat load and new energy unit output prediction data of the power system for each time period within the statistical period into the pre-constructed new energy consumption model to obtain the output of various units for each time period; The analysis module is used to summarize the output of the new energy units in each period of the cycle, and combine it with the total electrical load of the cycle to determine the absorption capacity of new energy. The new energy consumption model, taking into account the constraints of generator unit operation and power supply system balance, aims to minimize the total system operating cost by adjusting the output of various generator units. The generator set operating constraints include the power output constraints of conventional units and the thermoelectric coupling constraints of CHP units; The construction of the new energy consumption model includes: To minimize the total operating cost of the system, an objective function is established. Based on the characteristics of various generator units, construct generator unit operation constraints for the objective function; Based on the characteristics of the power system, power supply system balance constraints are constructed for the objective function; The operating constraints of the generator sets include: power output constraints of conventional units, power output constraints and thermal output constraints of CHP units, constraints on power changes of conventional and CHP units, and power output constraints of new energy units; the power supply system balance constraints include: power balance constraints and thermal balance constraints. The objective function is calculated as follows: Where z represents the total system operating cost, including fuel consumption costs and start-up and shutdown costs of the units; g1 represents the number of conventional units; g2 represents the number of CHP units; and g represents the total number of conventional and CHP units. Let be the fuel consumption cost of a conventional unit in the t-th time period. Let uc be the fuel consumption cost of the CHP generator set in the t-th time period. g,t DC is the cost of starting up the unit in the t-th time period. g,t The cost of the unit being out of service during the t-th time period; The electrical output constraints and thermal output constraints of the CHP unit are shown in the following formulas: in, Let be the electrical output of the CHP unit in the t-th time period. This represents the lower limit of the electrical output of the CHP unit. This is the upper limit of the electrical output of the CHP unit. Let be the thermal output of the CHP unit in the t-th time period. This represents the lower limit of the thermal output of the CHP unit. This is the upper limit of the thermal output of the CHP unit; The fuel consumption cost of the CHP unit in the t-th time period The calculation formula is as follows: Among them, u g2,t Let a be the operating status of the CHP unit in the t-th time period. g2 The basic cost for starting up the machine. Let be the electrical output of the CHP unit in the t-th time period. Let be the thermal output of the CHP unit in the t-th time period. Due to the electrothermal coupling relationship of the CHP unit, the cost is affected by both electrical output and thermal output. This refers to the fuel consumption cost coefficient for the CHP unit. The CHP units include back-pressure units and extraction units; The output characteristics of a back-pressure unit are shown in the following formula: Where Cb is the proportionality coefficient; The output characteristics of the extraction turbine unit are shown in the following formula: in, Cv represents the installed capacity of the CHP unit, and Cv is the proportional coefficient.

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