Electrolytic aluminum industry self-provided power plant scheduling method considering new energy consumption

Abstract

The invention discloses an electrolytic aluminum industry self-provided power plant scheduling method considering new energy consumption, and the method comprises the steps: constructing a power utilization balance constraint and a cogeneration unit constraint based on a total power utilization plan, an industrial steam utilization plan and a power grid power purchase plan of a power utilization enterprise and a first power generation power prediction result predicted in advance, solving a corresponding third power generation power prediction result when the operation cost of the cogeneration unit is minimum, generating an initial power generation plan corresponding to the cogeneration unit, generating an initial power generation plan corresponding to a new energy power generation system, and generating an initial plan of temporary power purchase; adjusting the initial power generation plan of the cogeneration unit and the initial plan of temporary power purchase based on the second power generation power prediction result of the current day and the initial power generation plan of the new energy power generation system to obtain a power generation plan of the current day and a temporary power purchase plan of the current day; on the basis of ensuring stable operation of the self-contained power plant, the regulation effect of the thermal power generating unit in the self-contained power plant is exerted, and the overall operation cost of the self-contained power plant is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of self-provided power plant dispatching, and in particular to a method for dispatching self-provided power plants in the electrolytic aluminum industry taking into account the consumption of new energy. Background Art

[0002] Some companies require more electricity, such as steel, chemical and electrolytic aluminum companies. If all this electricity comes from the power grid system, it may affect the stability of the local power grid and increase the cost of the company. Therefore, companies with more electricity consumption or surplus thermal energy (converting thermal energy into electricity) may build their own power plants.

[0003] The traditional self-provided power plant mainly uses thermal power generation. With the large-scale construction of renewable energy power generation systems, renewable energy power generation systems have become a new type of self-provided power plant. At this time, the power of the self-provided power plant comes from the renewable energy power generation system, the traditional thermal power generation system and the power grid system. Therefore, it is necessary to dispatch the power resources of the self-provided power plant.

[0004] At present, the scheduling method between the power resources of self-contained power plants adopts the safety-constrained unit combination (SCED) and safety-constrained economic dispatch (SCUC) algorithms. This algorithm meets the electricity demand of the enterprise and ensures the safe production of the self-contained power plant, but does not consider the full complementary utilization of multiple energy sources and does not meet the low-cost electricity demand under multiple energy sources. Therefore, the existing scheduling method of power resources of self-contained power plants is difficult to achieve safe and low-cost coordinated management and control of self-contained power plants. Summary of the invention

[0005] In view of this, the present invention provides a method for dispatching self-owned power plants in the electrolytic aluminum industry taking into account the consumption of new energy. The main purpose is to solve the problem that the existing dispatching methods for electricity resources in the self-owned power fields of electrolytic aluminum enterprises are difficult to achieve safe and low-cost collaborative management and control of self-owned power plants.

[0006] According to one aspect of the present application, a method for dispatching a self-provided power plant in the electrolytic aluminum industry taking into account the consumption of new energy is provided, wherein the self-provided power plant includes a cogeneration unit and a new energy power generation system, and the method includes:

[0007] Obtaining the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power grid purchase plan and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes a first power generation forecast result predicted in advance and a second power generation forecast result predicted on the same day, and both the advance forecast and the same day forecast include multiple sampling moments;

[0008] Based on the total electricity consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation power forecast result, constructing a power balance constraint and a cogeneration unit constraint, and solving a third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraint and the cogeneration unit constraint;

[0009] Based on the third power generation prediction result, an initial power generation plan corresponding to the cogeneration unit is generated; based on the first power generation prediction result, an initial power generation plan corresponding to the new energy power generation system is generated; based on the power balance constraint, an initial plan for temporary power purchase is generated;

[0010] Based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan for the cogeneration unit on the same day and the temporary power purchase plan for the same day.

[0011] Optionally, the cogeneration unit constraint includes a heat-to-power constraint and a ramp rate constraint, and based on the total power consumption plan, the industrial steam consumption plan, the power grid power purchase plan and the first power generation power forecast result, constructing a power balance constraint and a cogeneration unit constraint, and solving a third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraint and the cogeneration unit constraint, including:

[0012] Based on the total electricity consumption plan, the power grid power purchase plan and the first power forecast result, constructing the electricity consumption balance constraint condition corresponding to the electricity consuming enterprise at each sampling time;

[0013] Based on the industrial steam plan, construct the heat-to-electricity constraint conditions corresponding to each thermal power unit in the cogeneration unit at each sampling time;

[0014] Based on the rated climbing amount of each thermal power unit, constructing a climbing rate constraint condition of each thermal power unit;

[0015] Taking the minimization of the operation cost of the cogeneration unit as the objective function, the objective function, the power balance constraint, the heat-to-power constraint and the ramp rate constraint are used as a power prediction model for the cogeneration unit;

[0016] The power prediction model is solved to obtain the third power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time.

[0017] Optionally, the generating an initial power generation plan corresponding to the cogeneration unit based on the third power generation prediction result of the cogeneration unit, generating an initial power generation plan corresponding to the new energy power generation system based on the first power generation prediction result, and generating an initial plan for temporary power purchase based on the power balance constraint, includes:

[0018] Based on the third power generation prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time, generating an initial power generation plan corresponding to the cogeneration unit;

[0019] Obtaining a first power generation prediction value corresponding to the new energy power generation system at each sampling time from the first power generation prediction result, and generating an initial power generation plan corresponding to the new energy power generation system;

[0020] According to the power balance constraint, an initial plan for temporary power purchase is generated based on the total power plan, the initial power generation plan corresponding to the cogeneration unit, the initial power generation plan corresponding to the new energy power generation system and the power purchase plan of the power grid.

[0021] Optionally, the power prediction model of the cogeneration unit is:

[0022]

[0023] Among them, F(P1,P2,...,P n ) is the operating cost of the cogeneration unit, B i (P i ) is the i-th thermal power unit when the power generation power is P i The amount of fuel at the time, B i is the coefficient affected by industrial steam consumption, p coal is the fuel price, P Al,t is the total power consumption at time t in the total power consumption plan; P Heat,t is the total power generation of the cogeneration unit at time t; P pv,t is the power generation at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t, minP Heat,i , maxP Heat,i are the upper and lower limits of the power generation of the i-th thermal power unit, P Heat,t,i is the power generation of the i-th thermal power unit at time t, P Heat,t+1,i is the power generation of the i-th thermal power unit at time t+1; Δ i is the rated climbing capacity of the i-th thermal power unit.

[0024] Optionally, adjusting the initial power generation plan of the cogeneration unit and the initial plan of temporary power purchase based on the second power generation power prediction result and the initial power generation plan of the new energy power generation system includes:

[0025] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0026] Based on the second power generation prediction value and the first power generation prediction value at each sampling time in the initial power generation plan of the new energy power generation system, calculating the power generation prediction difference between the current day prediction and the advance prediction;

[0027] If the power generation prediction difference is less than zero, then determining the increased power generation value of each thermal power unit based on the ramp rate of each thermal power unit in the cogeneration unit;

[0028] If the total power generation value increased by all thermal power units is less than the absolute value of the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value increased and the absolute value of the power generation prediction difference.

[0029] Optionally, after calculating the difference between the current day's prediction and the advance prediction of the generated power, the scheduling method further includes:

[0030] If the power generation prediction difference is greater than zero, then based on the ramp rate of each thermal power unit in the cogeneration unit, determining the power generation value to be reduced for each thermal power unit;

[0031] If the total power generation value reduced by all thermal power units is less than the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value reduced and the power generation prediction difference.

[0032] Optionally, obtaining the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day includes:

[0033] Based on the adjusted power generation value of each thermal power unit in the cogeneration unit, modify the initial power generation plan corresponding to the cogeneration unit to obtain the power generation plan of the cogeneration unit for the day;

[0034] Based on the adjustment value of the temporary power purchase amount, modify the initial plan of temporary power purchase to obtain a temporary power purchase plan for the day;

[0035] The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy sources also includes:

[0036] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0037] Based on the second power generation prediction value, the initial power generation plan corresponding to the new energy power generation system is adjusted to obtain the power generation plan of the new energy power generation system for the day.

[0038] According to another aspect of the present application, a self-provided power plant dispatching device for the electrolytic aluminum industry considering the consumption of new energy is provided, wherein the self-provided power plant includes a cogeneration unit and a new energy power generation system, and the device includes:

[0039] A basic data acquisition module is used to obtain the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power grid purchase plan and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes a first power generation forecast result predicted in advance and a second power generation forecast result predicted on the same day, and both the advance forecast and the same day forecast include multiple sampling moments;

[0040] A third power generation prediction module is used to construct power balance constraints and cogeneration unit constraints based on the total power consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation prediction result, and solve the third power generation prediction result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraints and the cogeneration unit constraints;

[0041] an initial plan generating module, configured to generate an initial power generation plan corresponding to the cogeneration unit based on the third power generation prediction result, generate an initial power generation plan corresponding to the new energy power generation system based on the first power generation prediction result, and generate an initial plan for temporary power purchase based on the power balance constraint;

[0042] A plan adjustment module is used to adjust the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase based on the second power generation power prediction result and the initial power generation plan of the new energy power generation system, so as to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day.

[0043] Optionally, the cogeneration unit constraint includes a heat-to-power constraint and a ramp rate constraint, and the third power generation prediction module is further used for:

[0044] Based on the total electricity consumption plan, the power grid power purchase plan and the first power forecast result, constructing the electricity consumption balance constraint condition corresponding to the electricity consuming enterprise at each sampling time;

[0045] Based on the industrial steam plan, construct the heat-to-electricity constraint conditions corresponding to each thermal power unit in the cogeneration unit at each sampling time;

[0046] Based on the rated climbing amount of each thermal power unit, constructing a climbing rate constraint condition of each thermal power unit;

[0047] Taking the minimization of the operation cost of the cogeneration unit as the objective function, the objective function, the power balance constraint, the heat-to-power constraint and the ramp rate constraint are used as a power prediction model for the cogeneration unit;

[0048] The power prediction model is solved to obtain the third power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time.

[0049] Optionally, the initial plan generating module is further used for:

[0050] Based on the third power generation prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time, generating an initial power generation plan corresponding to the cogeneration unit;

[0051] Obtaining a first power generation prediction value corresponding to the new energy power generation system at each sampling time from the first power generation prediction result, and generating an initial power generation plan corresponding to the new energy power generation system;

[0052] According to the power balance constraint, an initial plan for temporary power purchase is generated based on the total power plan, the initial power generation plan corresponding to the cogeneration unit, the initial power generation plan corresponding to the new energy power generation system and the power purchase plan of the power grid.

[0053] Optionally, the power prediction model of the cogeneration unit is:

[0054]

[0055] Among them, F(P1,P2,...,P n ) is the operating cost of the cogeneration unit, B i (P i ) is the i-th thermal power unit when the power generation power is P i The amount of fuel at the time, B i is the coefficient affected by industrial steam consumption, p coal is the fuel price, P Al,t is the total power consumption at time t in the total power consumption plan; P Heat,t is the total power generation of the cogeneration unit at time t; P pv,t is the power generation at time t in the first power generation prediction result of the new energy power generation system; P buy,tis the electric energy purchased from the grid at time t, minP Heat,i , maxP Heat,i are the upper and lower limits of the power generation of the i-th thermal power unit, P Heat,t,i is the power generation of the i-th thermal power unit at time t, P Heat,t+1,i is the power generation of the i-th thermal power unit at time t+1; Δ i is the rated climbing capacity of the i-th thermal power unit.

[0056] Optionally, the plan adjustment module is further used to:

[0057] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0058] Based on the second power generation prediction value and the first power generation prediction value at each sampling time in the initial power generation plan of the new energy power generation system, calculating the power generation prediction difference between the current day prediction and the advance prediction;

[0059] If the power generation prediction difference is less than zero, then determining the increased power generation value of each thermal power unit based on the ramp rate of each thermal power unit in the cogeneration unit;

[0060] If the total power generation value increased by all thermal power units is less than the absolute value of the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value increased and the absolute value of the power generation prediction difference.

[0061] Optionally, the plan adjustment module is further used to:

[0062] If the power generation prediction difference is greater than zero, then based on the ramp rate of each thermal power unit in the cogeneration unit, determining the power generation value to be reduced for each thermal power unit;

[0063] If the total power generation value reduced by all thermal power units is less than the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value reduced and the power generation prediction difference.

[0064] Optionally, the plan adjustment module is further used to:

[0065] Based on the adjusted power generation value of each thermal power unit in the cogeneration unit, modify the initial power generation plan corresponding to the cogeneration unit to obtain the power generation plan of the cogeneration unit for the day;

[0066] Based on the adjustment value of the temporary power purchase amount, modify the initial plan of temporary power purchase to obtain a temporary power purchase plan for the day;

[0067] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0068] Based on the second power generation prediction value, the initial power generation plan corresponding to the new energy power generation system is adjusted to obtain the power generation plan of the new energy power generation system for the day.

[0069] According to another aspect of the present application, a storage medium is provided, in which at least one executable instruction is stored, and the executable instruction enables a processor to execute operations corresponding to the above-mentioned method for dispatching self-contained power plants in the electrolytic aluminum industry taking into account the consumption of new energy.

[0070] According to another aspect of the present application, a computer device is provided, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0071] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the above-mentioned method for dispatching self-provided power plants in the electrolytic aluminum industry taking into account the consumption of new energy.

[0072] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0073] The present application provides a method for dispatching a self-contained power plant in the electrolytic aluminum industry that takes into account the consumption of new energy. The method constructs a power balance constraint and a cogeneration unit constraint based on the total power consumption plan, industrial steam consumption plan, power purchase plan of the power grid and the first power generation power prediction result predicted in advance by the electrolytic aluminum enterprise. Under the power balance constraint and the cogeneration unit constraint, the third power generation power prediction result corresponding to the minimum operating cost of the cogeneration unit is solved to generate an initial power generation plan corresponding to the cogeneration unit, and then generates an initial power generation plan corresponding to the new energy power generation system and an initial plan for temporary power purchase. According to the second power generation power prediction result and the initial power generation plan of the new energy power generation system, the cogeneration unit is dispatched. The initial power generation plan of the unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan for the day and the temporary power purchase plan for the day of the cogeneration unit. The internal power generation plan of the self-owned power plant can be optimized in two stages: the day before and the day after, and the cogeneration unit, new energy power generation system, and temporary power purchase from the power grid can be coordinated to undertake the power supply task. At the same time, the economy of the overall operation of the self-owned power plant is considered to achieve joint decision-making on power generation plans of multiple power sources such as thermal power and new energy. On the basis of ensuring the stable operation of the self-owned power plant, the regulating role of the thermal power units in the self-owned power plant is brought into play, the coordinated operation capability of multiple types of power sources is improved, the overall operating cost of the self-owned power plant is reduced, and a realization method is provided for the compilation of power generation plans of self-owned power plants.

[0074] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0076] Figure 1 A flow chart of a method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy is shown in an embodiment of the present application;

[0077] Figure 2 A thermal power schematic diagram of a self-provided power plant of an electrolytic aluminum plant is shown, which is a method for dispatching a self-provided power plant for an electrolytic aluminum industry taking into account the consumption of new energy, provided in an embodiment of the present application;

[0078] Figure 3 A flow chart of another method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy provided in an embodiment of the present application is shown;

[0079] Figure 4 A structural block diagram of a self-provided power plant dispatching device for the electrolytic aluminum industry taking into account the consumption of new energy is shown in an embodiment of the present application;

[0080] Figure 5 A schematic structural diagram of a computer device provided by an embodiment of the present invention is shown.

[0081] in,

[0082] Figure 4 In: 402-basic data acquisition module; 404-third power generation prediction module; 406-initial plan generation module; 408-plan adjustment module;

[0083] Figure 5 In it: 502 - processor; 504 - communication interface; 506 - memory; 508 - communication bus; 510 - program. DETAILED DESCRIPTION

[0084] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0085] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0086] In view of the problem that the current scheduling method for the power resources of the self-provided power plant of the existing electrolytic aluminum enterprise is difficult to achieve the safe and low-cost coordinated management and control of the self-provided power plant, the embodiment of the present application provides a scheduling method for the self-provided power plant of the electrolytic aluminum industry considering the consumption of new energy. The self-provided power plant includes a cogeneration unit and a new energy power generation system, such as Figure 1 As shown, the method includes:

[0087] 102: Obtain the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power purchase plan of the power grid and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes the first power generation forecast result predicted in advance and the second power generation forecast result predicted on the day, and both the advance forecast and the day forecast include multiple sampling moments;

[0088] 104: Based on the total electricity consumption plan, industrial steam consumption plan, power grid purchase plan and the first power generation power forecast result, construct the power balance constraint and the cogeneration unit constraint. Under the power balance constraint and the cogeneration unit constraint, solve the third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit;

[0089] 106: Based on the third power generation prediction result, generate an initial power generation plan corresponding to the cogeneration unit, based on the first power generation prediction result, generate an initial power generation plan corresponding to the new energy power generation system, and based on the power balance constraint, generate an initial plan for temporary power purchase;

[0090] 108: Based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan for the cogeneration unit on that day and the temporary power purchase plan for the same day.

[0091] Specifically, a microgrid model of the electricity user is constructed. The microgrid model includes electricity load, self-contained power plant and power grid system. The self-contained power plant includes thermal power generation system, new energy power generation system (photovoltaic power generation system, wind power generation system, tidal power generation system, etc.).

[0092] The first power generation prediction result is the power generation prediction value predicted for a certain day in advance for a preset period of time, and the second power generation prediction result is the power generation prediction value predicted for the day corresponding to a certain day. In order to ensure the normal operation of the enterprise, the power consumption balance of the enterprise must be guaranteed. In order to ensure the safe operation of the cogeneration unit, the cogeneration unit constraint must be met. Therefore, based on the total power consumption plan of the power-consuming enterprise, the industrial steam plan, the power purchase plan of the power grid and the first power generation prediction result predicted in advance by the new energy power generation system, the power balance constraint and the cogeneration unit constraint are constructed. Under the power balance constraint and the cogeneration unit constraint, the third power generation prediction result corresponding to the minimum operating cost of the cogeneration unit is solved, and the initial power generation plan corresponding to the cogeneration unit is generated. The new energy power generation system meets the principle of full power generation, so the first power generation prediction result is the power generation prediction value of the new energy power generation system, and the initial power generation plan corresponding to the new energy power generation system is generated according to the power generation prediction value of the new energy power generation system. In order to ensure the balance of the enterprise's electricity consumption, if the power generation forecast value of the new energy power generation system, the power generation forecast value of the cogeneration unit and the medium- and long-term power purchase amount are added together and still cannot meet the enterprise's electricity demand, the temporary power purchase amount is calculated to generate an initial plan for temporary power purchase. According to the second power generation forecast result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day.

[0093] The electricity-consuming enterprise in this application takes the aluminum electrolysis plant as an example, and constructs a microgrid model of the aluminum electrolysis plant. The loads in the microgrid model are the aluminum electrolysis equipment and the plant electricity, and the electricity sources are the power grid system and the self-provided power plant, among which the self-provided power plant includes cogeneration thermal power units and centralized photovoltaic stations.

[0094] Obtain the overall production plan of the aluminum electrolysis plant, the industrial steam plan of the cogeneration unit, the medium- and long-term electricity purchase plan, the short-term power forecast results of the photovoltaic station, and the ultra-short-term power forecast results. The short-term power forecast result of the photovoltaic station is the power generation power predicted a period of time in advance, which is also the first power generation power forecast result in this application. The ultra-short-term is the second power generation power forecast result predicted on the same day, wherein the forecast result includes the power generation power forecast values ​​at multiple sampling times.

[0095] According to the overall production plan of the aluminum smelter, the industrial steam plan of the cogeneration unit, the medium- and long-term electricity purchase plan, and the short-term and ultra-short-term power forecast results of the photovoltaic station, the microgrid model is dispatched in two stages, the day before and the day after. During the dispatching process, priority is given to the consumption of photovoltaic power, and the balance of supply and demand of the microgrid is ensured by adjusting the thermal power units and purchasing electricity from the power grid. During the dispatching process, full consideration is given to the demand for industrial steam, and the adjustable range of the thermal power units is constrained by heat-to-electricity.

[0096] The present application provides a method for dispatching a self-contained power plant in the electrolytic aluminum industry taking into account the consumption of new energy. Compared with the prior art, the method constructs a power balance constraint and a cogeneration unit constraint based on the total power consumption plan, industrial steam consumption plan, power grid power purchase plan and the first power generation power prediction result predicted in advance by the electrolytic aluminum enterprise. Under the power balance constraint and the cogeneration unit constraint, the third power generation power prediction result corresponding to the minimum operating cost of the cogeneration unit is solved, and the initial power generation plan corresponding to the cogeneration unit is generated. Then, the initial power generation plan corresponding to the new energy power generation system and the initial plan for temporary power purchase are generated. According to the second power generation power prediction result and the initial power generation plan of the new energy power generation system, The initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day. The internal power generation plan of the captive power plant can be optimized in two stages: the day before and the day after, and the cogeneration unit, the new energy power generation system, and the temporary power purchase of the power grid can be coordinated to undertake the power supply task. At the same time, the economy of the overall operation of the captive power plant is considered to achieve joint decision-making on power generation plans of multiple power sources such as thermal power and new energy. On the basis of ensuring the stable operation of the captive power plant, the regulating role of the thermal power units in the captive power plant is brought into play, the coordinated operation capability of multiple types of power sources is improved, the overall operating cost of the captive power plant is reduced, and a realization method is provided for the compilation of power generation plans of captive power plants.

[0097] In one embodiment of the present invention, the cogeneration unit constraint includes a heat-to-power constraint and a ramp rate constraint. Based on the total power consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation power forecast result, a power balance constraint and a cogeneration unit constraint are constructed. Under the power balance constraint and the cogeneration unit constraint, the third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit is solved, including:

[0098] Based on the total electricity consumption plan, the power grid purchase plan and the first power forecast results, the corresponding electricity consumption balance constraints of the electricity users at each sampling time are constructed;

[0099] Based on the industrial steam plan, the heat-to-electricity constraint conditions corresponding to each thermal unit in the cogeneration unit at each sampling time are constructed;

[0100] Based on the rated ramp rate of each thermal power unit, the ramp rate constraint condition of each thermal power unit is constructed;

[0101] Taking the minimum operation cost of the cogeneration unit as the objective function, the objective function, power balance constraint, heat-to-power constraint and ramp rate constraint are used as the power prediction model of the cogeneration unit.

[0102] The power prediction model is solved to obtain the third power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time.

[0103] Specifically, a cogeneration unit is a system that can generate heat and convert it into electrical energy when there is excess heat energy. Therefore, the cogeneration unit must meet the heat-to-electricity constraint. To ensure the normal operation of the enterprise, the power balance must be guaranteed. In order to ensure the safe operation of the thermal unit, the thermal unit must meet the ramp rate constraint. Therefore, based on the objective function of minimizing the operating cost of the cogeneration unit, the power balance constraint, the heat-to-electricity constraint, and the ramp rate constraint, a power prediction model for the cogeneration unit is constructed.

[0104] Taking the aluminum smelter as an example, the self-provided power plant includes a cogeneration unit and a photovoltaic station. The cogeneration unit generates heat and electricity. The heat is the hot steam provided for industrial production, and the electricity is the electrical load provided for the operation of the enterprise. Figure 2 As shown. Through the power resource dispatching method of the self-provided power plant, the adjustment space and performance of the unit under various types of working conditions are accurately controlled, the electrolytic aluminum production and industrial steam supply needs are fully considered, the economic analysis of the self-provided power plant as a whole is carried out, and the fuel cost is fully considered. The problems faced by the self-provided power plant dispatching, such as the difficulty in fully complementing and utilizing multiple energy sources, the contradiction between the delivery of new energy and the economic operation of the original cogeneration units, and the complex energy composition types, are solved, and the intelligence and economy of the self-provided power plant dispatching are improved.

[0105] In one embodiment, the power prediction model of the cogeneration unit is:

[0106]

[0107] Among them, F(P1,P2,...,P n ) is the operating cost of the cogeneration unit, B i (P i ) is the i-th thermal power unit when the power generation power is P i The amount of fuel at the time, B i is the coefficient affected by industrial steam consumption, p coal is the fuel price, P Al,t is the total power consumption at time t in the total power consumption plan; P Heat,t is the total power generation of the cogeneration unit at time t; P pv,t is the power generation at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t, minP Heat,i , maxP Heat,i are the upper and lower limits of the power generation of the i-th thermal power unit, P Heat,t,i is the power generation of the i-th thermal power unit at time t, P Heat,t+1,i is the power generation of the i-th thermal power unit at time t+1; Δ iis the rated climbing capacity of the i-th thermal power unit.

[0108] Specifically, the power generation capacity of the cogeneration unit in the power generation plan for the day is obtained through optimization calculation, wherein the objective function to be optimized is:

[0109]

[0110] Where: F(P1,P2,...,P n ) is the operating cost of the heating unit, B i (P i ) is the power of the i-th unit, P i The amount of fuel at the time, B i Coefficient affected by industrial steam consumption; p coal for fuel prices;

[0111] The constraints to be optimized include the system balance constraints and unit constraints of the power users, among which the unit constraints are affected by the industrial steam consumption plan.

[0112] The system balance constraint is the balance of the enterprise's electricity consumption. In other words, the total electricity used by the enterprise during normal operation is equal to the electricity provided. Since the principle of the new energy power generation system is to generate as much as possible, the power generation of the new energy power generation system is its power forecast data:

[0113] Receive the power forecast data predicted in advance in the renewable energy power generation system of the self-provided power plant, and build the power balance constraints of the power users:

[0114] P Al,t =P Heat,t +P pv,t +P buy,t

[0115] Where: P Al,t is the total power consumption (including factory power consumption) at time t in the production plan; P Heat,t is the predicted value of the total power generation of the cogeneration unit at time t; P pv,t is the power generation prediction value at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t in the grid power purchase plan;

[0116]

[0117] Where: P Heat,t,i is the predicted value of power generation of the i-th thermal power unit at time t;

[0118] P buy,t =P buy,plan,t +P buy,temp,t

[0119] Where: P buy,plan,t P is the amount of electricity purchased at time t in the medium- and long-term electricity purchase plan, which is submitted annually and cannot be changed midway; buy,temp,t It is the temporary power purchase amount at time t and can be changed at any time.

[0120] Temporary electricity purchases will increase electricity costs. Therefore, when the electricity produced by cogeneration units, new energy power generation systems, and medium- and long-term electricity purchases can meet the company's electricity needs, temporary electricity purchases will not be considered.

[0121] The unit constraints include unit output constraints and unit ramp rate constraints. The unit output constraints need to meet the thermal power constraints:

[0122] minP Heat,i ≤P Heat,t,i ≤maxP Heat,i

[0123] Where: minP Heat,i , maxP Heat,i are the upper and lower limits of the output of the i-th unit, respectively, where minP Heat,i , maxP Heat,i It is determined by the electric and thermal characteristic curve of the cogeneration unit and affected by the industrial steam consumption.

[0124] The unit ramp rate constraints need to meet:

[0125] -Δ i ≤P Heat,t+1,i -P Heat,t,i ≤Δ i

[0126] Where: P Heat,t+1,i is the predicted power generation value of the i-th unit at time t+1; Δ i is the rated ramp capacity of the i-th unit.

[0127] The power prediction model of the cogeneration unit is solved by using the chaotic particle swarm algorithm;

[0128] The chaotic particle swarm algorithm selects the top 20% of excellent particles for chaotic Logistic mapping based on the traditional particle swarm algorithm.

[0129] Logistic mapping is used as a typical example to illustrate complex chaotic phenomena. Its formula is as follows. When μ=4, it is completely chaotic:

[0130] x(n+1)=μx(n)[1-x(n)]x∈[0,1]

[0131] The chaos mapping operation method is as follows:

[0132]

[0133]

[0134] Where: is the chaotic variable, x j,max 、x j,max is the search boundary of the j-th dimension variable.

[0135] After the excellent particle chaos search is completed, the optimal position of the particle itself and the optimal position of the group are recalculated. Repeat the above process to obtain the optimal solution of the objective function.

[0136] The primary goal of a self-owned power plant is to ensure the production of electrolytic aluminum, with industrial steam supply as a secondary goal. Combined with the overall production plan of the electrolytic aluminum plant, the industrial steam plan of the cogeneration unit, and the medium- and long-term electricity purchase plan, it is further allocated into the day-ahead and intraday power generation plans of each unit and station.

[0137] In one embodiment, based on the third power generation prediction result of the cogeneration unit, an initial power generation plan corresponding to the cogeneration unit is generated, based on the first power generation prediction result, an initial power generation plan corresponding to the new energy power generation system is generated, and based on the power balance constraint, an initial plan for temporary power purchase is generated, including:

[0138] Based on the third power generation power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time, generating an initial power generation plan corresponding to the cogeneration unit;

[0139] Obtaining the first power generation prediction value corresponding to the new energy power generation system at each sampling time from the first power generation prediction result, and generating an initial power generation plan corresponding to the new energy power generation system;

[0140] According to the power balance constraint, an initial plan for temporary power purchase is generated based on the total power plan, the initial power generation plan corresponding to the cogeneration unit, the initial power generation plan corresponding to the new energy power generation system and the power purchase plan of the power grid.

[0141] Specifically, a power prediction model for the cogeneration unit is constructed, and the third power prediction value corresponding to each thermal unit in the cogeneration unit at each sampling time is obtained by solving the power prediction model. According to the third power prediction value corresponding to each thermal unit at each sampling time, the corresponding initial power generation plan of the cogeneration unit is generated. Since the principle of the formulation of the new energy power generation system is to generate as much as possible, the planned power generation of the new energy power generation system is its power prediction data, that is, the first power prediction value corresponding to each sampling time in the first power prediction result. Based on the first power prediction value and its corresponding sampling time, the initial power generation plan corresponding to the new energy power generation system is generated.

[0142] The total electricity consumption of the enterprise is obtained from the total electricity consumption plan. The total electricity consumption of the enterprise is equal to the provided electricity consumption. Therefore, knowing the total electricity consumption of the enterprise, the predicted power generation of the cogeneration unit and the predicted power generation of the new energy power generation system, the power purchase amount of the power grid can be obtained. The power purchase amount of the power grid includes medium- and long-term power purchase and temporary power purchase. Since the medium- and long-term power purchase cannot be changed, the temporary power purchase amount can only be changed at any time.

[0143] P Al,t =P Heat,t +P pv,t +P buy,t

[0144] Where: P Al,t is the total power consumption (including factory power consumption) at time t in the production plan; P Heat,t is the predicted value of the total power generation of the cogeneration unit at time t; P pv,t is the power generation prediction value at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t in the grid power purchase plan;

[0145] P buy,t =P buy,plan,t +P buy,temp,t

[0146] Where: P buy,plan,t P is the amount of electricity purchased at time t in the medium- and long-term electricity purchase plan, which is submitted annually and cannot be changed midway; buy,temp,t is the temporary power purchase amount at time t, which can be changed at any time. Therefore, the initial plan for temporary power purchase is generated based on the temporary power purchase amount.

[0147] In one embodiment, based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan of temporary power purchase are adjusted, including:

[0148] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0149] Based on the second power generation prediction value and the first power generation prediction value at each sampling time in the initial power generation plan of the new energy power generation system, the power generation prediction difference between the current day prediction and the advance prediction is calculated;

[0150] If the power generation prediction difference is less than zero, then the power generation value added by each thermal power unit is determined based on the ramp rate of each thermal power unit in the cogeneration unit;

[0151] If the total increased power generation value of all thermal power units is less than the absolute value of the power generation forecast difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the increased total power generation value and the absolute value of the power generation forecast difference.

[0152] Specifically, for the new energy power generation system, there are some errors between the power generation forecast value obtained some time in advance and the power generation forecast value obtained on the day. Therefore, based on the power generation forecast value obtained on the day, the initial power generation plan of the new energy power generation system is modified to obtain the power generation plan of the new energy power generation system on the day.

[0153] Since there is an error between the forecast value in advance and the forecast value on the day, in order to ensure the balance of electricity consumption of the electricity-consuming enterprises, the error needs to be compensated. When the difference between the forecast power of the day and the forecast power in advance is less than zero, it means that the power generation of the new energy power generation system is less than the expected power generation. First, the power generation of the thermal power unit in the cogeneration unit is used to compensate. Based on the ramp rate limit of each thermal power unit in the cogeneration unit, the power generation that can be increased by each thermal power unit is determined. If the thermal power unit in the cogeneration unit is less or cannot be compensated due to the ramp rate limit, the remaining difference is compensated by purchasing temporary electricity.

[0154]

[0155] Where: is the second power prediction value at time t, P pv,t is the first power generation prediction value at time t.

[0156] For example, taking the photovoltaic station as an example of the new energy power generation system, the photovoltaic station's daily power generation plan is the latest ultra-short-term power forecast data, that is, the power generation forecast value of the day, and the principle of generating as much as possible is adopted. The daily (same day) power generation plan of each photovoltaic station is its latest power forecast data.

[0157] The difference between the photovoltaic station's day-ahead power generation plan and the daily rolling plan is adjusted by the cogeneration units and temporary power purchases from the power grid. The cogeneration units are adjusted first. If the cogeneration units cannot supplement, temporary power purchases are used to adjust.

[0158] In one embodiment, after calculating the difference between the current day's prediction and the advance prediction of the generated power, the scheduling method further includes:

[0159] If the power generation prediction difference is greater than zero, the power generation value to be reduced for each thermal power unit is determined based on the ramp rate of each thermal power unit in the cogeneration unit;

[0160] If the total power generation value reduced by all thermal power units is less than the power generation forecast difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value reduced and the power generation forecast difference.

[0161] Specifically, when the difference between the predicted power generation on the day and the predicted power generation in advance is greater than zero, it means that the new energy power generation system on that day actually generated more power. At this time, the cogeneration unit is required to reduce the load. According to the actual situation, the power generation that can be reduced by each thermal unit in the cogeneration unit is determined. If the total power generation reduced by all thermal units is less than the power generation power forecast difference, it means that the thermal unit cannot be reduced. Then the thermal unit can be reduced as much as possible, and the remaining difference is made up by reducing the temporary purchase of electricity. In other words, when the new energy power generation forecast value on the day is greater than the advance power generation forecast value, it is preferred to reduce the power generation of the thermal power units in the cogeneration unit. If it cannot be made up, it is made up by reducing the temporary purchase of electricity.

[0162] In one embodiment, obtaining the power generation plan of the cogeneration unit on the current day and the temporary power purchase plan on the current day includes:

[0163] Based on the adjusted power generation value of each thermal unit in the cogeneration unit, the initial power generation plan corresponding to the cogeneration unit is modified to obtain the power generation plan of the cogeneration unit on the same day;

[0164] Based on the adjustment value of the temporary power purchase amount, the initial plan of temporary power purchase is modified to obtain the temporary power purchase plan for the day;

[0165] The dispatching method of self-provided power plants in the electrolytic aluminum industry considering the consumption of new energy also includes:

[0166] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0167] Based on the second power generation prediction value, the initial power generation plan corresponding to the new energy power generation system is adjusted to obtain the power generation plan for the new energy power generation system on that day.

[0168] Specifically, the power generation forecast value at time t in the initial power generation plan corresponding to the cogeneration unit is modified to the adjusted power generation forecast value, and the power generation forecast value at each sampling moment is modified accordingly to obtain the power generation plan of the cogeneration unit for the day.

[0169] The temporary electricity purchase value at time t in the initial temporary electricity purchase plan is modified to the adjusted temporary electricity purchase value, and the temporary electricity purchase value at each sampling moment is modified accordingly to obtain the temporary electricity purchase plan for the day.

[0170] The second power generation prediction value corresponding to the new energy power generation system at each sampling moment is obtained from the second power generation prediction result, also called the ultra-short-term power generation prediction value, and the power generation prediction value at time t in the initial power generation plan corresponding to the new energy power generation system is modified to the second power generation prediction value. The power generation prediction value at each sampling moment is modified accordingly to obtain the power generation plan for the new energy power generation system on that day.

[0171] In one embodiment, taking an aluminum smelter as an example, the new energy power generation system takes a photovoltaic power station as an example. The specific process is as follows: Figure 3 As shown:

[0172] Obtain the overall production plan of the aluminum smelter, the industrial steam plan of the cogeneration unit, and the medium- and long-term electricity purchase plan;

[0173] Receive short-term power forecast data of photovoltaic stations in self-provided power plants, and calculate the power generation of cogeneration units and photovoltaic stations at each moment:

[0174] Combine the industrial steam plan with the short-term power forecast data of the photovoltaic station to adjust the power generation of the cogeneration unit and formulate the day-ahead power generation plan of the cogeneration unit and the photovoltaic station;

[0175] The temporary power purchase plan is calculated by referring to the day-ahead power generation plan of the cogeneration unit and photovoltaic station:

[0176] Receive ultra-short-term power forecast data from photovoltaic stations, and optimize and adjust the daily power generation plan and temporary power purchase plan of cogeneration units and photovoltaic stations on a rolling basis;

[0177] The daily rolling power generation plan is sent to the automatic power generation control system to guide the operation of the captive power plant.

[0178] Furthermore, as a response to the above Figure 1 The implementation of the method shown in the figure, the embodiment of the present invention provides a self-provided power plant dispatching device for the electrolytic aluminum industry considering the consumption of new energy, each thermal power unit self-provided power plant includes a cogeneration unit and a new energy power generation system, such as Figure 4 As shown, the device comprises:

[0179] The basic data acquisition module 402 is used to obtain the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power purchase plan of the power grid and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes the first power forecast result predicted in advance and the second power forecast result predicted on the same day, and both the prediction in advance and the prediction on the same day include multiple sampling moments;

[0180] The third power generation prediction module 404 is used to construct power balance constraints and cogeneration unit constraints based on the total power consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation prediction result, and solve the third power generation prediction result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraints and the cogeneration unit constraints;

[0181] An initial plan generating module 406 is used to generate an initial power generation plan corresponding to the cogeneration unit based on the third power generation prediction result, generate an initial power generation plan corresponding to the new energy power generation system based on the first power generation prediction result, and generate an initial plan for temporary power purchase based on the power balance constraint;

[0182] The plan adjustment module 408 is used to adjust the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase based on the second power generation power prediction result and the initial power generation plan of the new energy power generation system, so as to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day.

[0183] The present application provides a self-contained power plant dispatching device for the electrolytic aluminum industry taking into account the consumption of new energy. Compared with the prior art, the device constructs a power balance constraint and a cogeneration unit constraint based on the total power consumption plan, industrial steam consumption plan, power grid power purchase plan and the first power generation power prediction result predicted in advance by the electrolytic aluminum enterprise. Under the power balance constraint and the cogeneration unit constraint, the third power generation power prediction result corresponding to the minimum operating cost of the cogeneration unit is solved, and the initial power generation plan corresponding to the cogeneration unit is generated. The initial power generation plan corresponding to the new energy power generation system and the initial plan for temporary power purchase are then generated. According to the second power generation power prediction result and the initial power generation plan of the new energy power generation system, The initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day. The internal power generation plan of the captive power plant can be optimized in two stages: the day before and the day after, and the cogeneration unit, the new energy power generation system, and the temporary power purchase of the power grid can be coordinated to undertake the power supply task. At the same time, the economy of the overall operation of the captive power plant is considered to achieve joint decision-making on power generation plans of multiple power sources such as thermal power and new energy. On the basis of ensuring the stable operation of the captive power plant, the regulating role of the thermal power units in the captive power plant is brought into play, the coordinated operation capability of multiple types of power sources is improved, the overall operating cost of the captive power plant is reduced, and a realization method is provided for the compilation of power generation plans of captive power plants.

[0184] In one embodiment, the combined heat and power unit constraints include heat-to-power constraints and ramp rate constraints, and the initial plan generation module is further used to:

[0185] Based on the total electricity consumption plan, the power grid purchase plan and the first power forecast results, the corresponding electricity consumption balance constraints of the electricity users at each sampling time are constructed;

[0186] Based on the industrial steam plan, the heat-to-electricity constraint conditions corresponding to each thermal unit in the cogeneration unit at each sampling time are constructed;

[0187] Based on the rated ramp rate of each thermal power unit, the ramp rate constraint condition of each thermal power unit is constructed;

[0188] Taking the minimum operation cost of the cogeneration unit as the objective function, the objective function, power balance constraint, heat-to-power constraint and ramp rate constraint are used as the power prediction model of the cogeneration unit.

[0189] The power prediction model is solved to obtain the third power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time.

[0190] In one embodiment, the initial plan generation module is further used to:

[0191] Based on the third power generation power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time, generating an initial power generation plan corresponding to the cogeneration unit;

[0192] Obtaining the first power generation prediction value corresponding to the new energy power generation system at each sampling time from the first power generation prediction result, and generating an initial power generation plan corresponding to the new energy power generation system;

[0193] According to the power balance constraint, an initial plan for temporary power purchase is generated based on the total power plan, the initial power generation plan corresponding to the cogeneration unit, the initial power generation plan corresponding to the new energy power generation system and the power purchase plan of the power grid.

[0194] In one embodiment, the power prediction model of the cogeneration unit is:

[0195]

[0196] Among them, F(P1,P2,...,P n ) is the operating cost of the cogeneration unit, B i (P i ) is the i-th thermal power unit when the power generation power is P i The amount of fuel at the time, B i is the coefficient affected by industrial steam consumption, p coal is the fuel price, P Al,t is the total power consumption at time t in the total power consumption plan; P Heat,t is the total power generation of the cogeneration unit at time t; P pv,tis the power generation at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t, minP Heat,i , maxP Heat,i are the upper and lower limits of the power generation of the i-th thermal power unit, P Heat,t,i is the power generation of the i-th thermal power unit at time t, P Heat,t+1,i is the power generation of the i-th thermal power unit at time t+1; Δ i is the rated climbing capacity of the i-th thermal power unit.

[0197] In one embodiment, the plan adjustment module is further configured to:

[0198] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0199] Based on the second power generation prediction value and the first power generation prediction value at each sampling time in the initial power generation plan of the new energy power generation system, the power generation prediction difference between the current day prediction and the advance prediction is calculated;

[0200] If the power generation prediction difference is less than zero, then the power generation value added by each thermal power unit is determined based on the ramp rate of each thermal power unit in the cogeneration unit;

[0201] If the total increased power generation value of all thermal power units is less than the absolute value of the power generation forecast difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the increased total power generation value and the absolute value of the power generation forecast difference.

[0202] In one embodiment, the plan adjustment module is further configured to:

[0203] If the power generation prediction difference is greater than zero, the power generation value to be reduced for each thermal power unit is determined based on the ramp rate of each thermal power unit in the cogeneration unit;

[0204] If the total power generation value reduced by all thermal power units is less than the power generation forecast difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value reduced and the power generation forecast difference.

[0205] In one embodiment, the plan adjustment module is further configured to:

[0206] Based on the adjusted power generation value of each thermal unit in the cogeneration unit, the initial power generation plan corresponding to the cogeneration unit is modified to obtain the power generation plan of the cogeneration unit on the same day;

[0207] Based on the adjustment value of the temporary power purchase amount, the initial plan of temporary power purchase is modified to obtain the temporary power purchase plan for the day;

[0208] Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result;

[0209] Based on the second power generation prediction value, the initial power generation plan corresponding to the new energy power generation system is adjusted to obtain the power generation plan for the new energy power generation system on that day.

[0210] According to one embodiment of the present invention, a storage medium is provided, which stores at least one executable instruction. The computer executable instruction can execute the method for dispatching a self-contained power plant for the electrolytic aluminum industry taking into account the consumption of new energy in any of the above method embodiments.

[0211] Figure 5 A schematic diagram of the structure of a computer device provided according to an embodiment of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the computer device.

[0212] like Figure 5 As shown, the computer device may include: a processor (processor) 502 , a communication interface (Communications Interface) 504 , a memory (memory) 506 , and a communication bus 508 .

[0213] The processor 502 , the communication interface 504 , and the memory 506 communicate with each other via a communication bus 508 .

[0214] The communication interface 504 is used to communicate with other devices such as clients or other servers.

[0215] Processor 502 is used to execute program 510, and specifically can execute the relevant steps in the above-mentioned embodiment of the scheduling method of the self-provided power plant of the electrolytic aluminum industry considering the consumption of new energy.

[0216] Specifically, the program 510 may include program codes, which include computer operation instructions.

[0217] The processor 502 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the computer device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0218] The memory 506 is used to store the program 510. The memory 506 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0219] The program 510 may be specifically configured to enable the processor 502 to perform the following operations:

[0220] Obtain the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power purchase plan of the power grid, and the power forecast results of the new energy power generation system. The power forecast results of the new energy power generation system include the first power generation forecast results predicted in advance and the second power generation forecast results predicted on the same day. Both the advance forecast and the same day forecast include multiple sampling moments.

[0221] Based on the total electricity consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation power forecast result, constructing the power balance constraint and the cogeneration unit constraint, and solving the third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraint and the cogeneration unit constraint;

[0222] Based on the third power generation prediction result, an initial power generation plan corresponding to the cogeneration unit is generated; based on the first power generation prediction result, an initial power generation plan corresponding to the new energy power generation system is generated; based on the power balance constraint, an initial plan for temporary power purchase is generated;

[0223] Based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan for the cogeneration unit on the same day and the temporary power purchase plan on the same day.

[0224] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices. In one embodiment, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0225] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A method for dispatching a self-provided power plant in the electrolytic aluminum industry taking into account the consumption of new energy, wherein the self-provided power plant includes a cogeneration unit and a new energy power generation system, characterized in that: include: Obtaining the total electricity consumption plan of the electrolytic aluminum enterprise, the industrial steam consumption plan of the cogeneration unit, the power grid purchase plan and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes a first power generation forecast result predicted in advance and a second power generation forecast result predicted on the same day, and both the advance forecast and the same day forecast include multiple sampling moments; Based on the total electricity consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation power forecast result, constructing a power balance constraint and a cogeneration unit constraint, and solving a third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraint and the cogeneration unit constraint; Based on the third power generation prediction result, an initial power generation plan corresponding to the cogeneration unit is generated; based on the first power generation prediction result, an initial power generation plan corresponding to the new energy power generation system is generated; based on the power balance constraint, an initial plan for temporary power purchase is generated; Based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase are adjusted to obtain the power generation plan for the cogeneration unit on the same day and the temporary power purchase plan for the same day.

2. The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy as claimed in claim 1, characterized in that: The cogeneration unit constraint includes a heat-to-power constraint and a ramp rate constraint. Based on the total power consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation power forecast result, a power balance constraint and a cogeneration unit constraint are constructed. Under the power balance constraint and the cogeneration unit constraint, a third power generation power forecast result corresponding to the minimum operation cost of the cogeneration unit is solved, including: Based on the total electricity consumption plan, the power grid power purchase plan and the first power forecast result, constructing the electricity consumption balance constraint condition corresponding to the electricity consuming enterprise at each sampling time; Based on the industrial steam plan, construct the heat-to-electricity constraint conditions corresponding to each thermal power unit in the cogeneration unit at each sampling time; Based on the rated climbing amount of each thermal power unit, constructing a climbing rate constraint condition of each thermal power unit; Taking the minimization of the operation cost of the cogeneration unit as the objective function, the objective function, the power balance constraint, the heat-to-power constraint and the ramp rate constraint are used as a power prediction model for the cogeneration unit; The power prediction model is solved to obtain the third power prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time.

3. The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy as claimed in claim 2, characterized in that: The method of generating an initial power generation plan corresponding to the cogeneration unit based on the third power generation prediction result of the cogeneration unit, generating an initial power generation plan corresponding to the new energy power generation system based on the first power generation prediction result, and generating an initial plan for temporary power purchase based on the power balance constraint includes: Based on the third power generation prediction value corresponding to each thermal power unit in the cogeneration unit at each sampling time, generating an initial power generation plan corresponding to the cogeneration unit; Obtaining a first power generation prediction value corresponding to the new energy power generation system at each sampling time from the first power generation prediction result, and generating an initial power generation plan corresponding to the new energy power generation system; According to the power balance constraint, an initial plan for temporary power purchase is generated based on the total power plan, the initial power generation plan corresponding to the cogeneration unit, the initial power generation plan corresponding to the new energy power generation system and the power purchase plan of the power grid.

4. The method for dispatching self-provided power plants for the electrolytic aluminum industry considering the consumption of new energy as described in claim 2, characterized in that: The power prediction model of the cogeneration unit is: s.t.P Al,t =P Heat,t +P pv,t +P buy,t my P Heat,i ≤P Heat,t,i ≤max P Heat,i -D i ≤P Heat,t+1,i -P Heat,t,i ≤Δ i Among them, F(P1,P2,...,P n ) is the operating cost of the cogeneration unit, B i (P i ) is the i-th thermal power unit with power generation power P i The amount of fuel at the time, B i is the coefficient affected by industrial steam consumption, p coal is the fuel price, P Al,t is the total power consumption at time t in the total power consumption plan; P Heat,t is the total power generation of the cogeneration unit at time t; P pv,t is the power generation at time t in the first power generation prediction result of the new energy power generation system; P buy,t is the electric energy purchased from the grid at time t, minP Heat,i , max P Heat,i are the upper and lower limits of the power generation of the i-th thermal power unit, P Heat,t,i is the power generation of the i-th thermal power unit at time t, P Heat,t+1,i is the power generation of the i-th thermal power unit at time t+1; Δ i is the rated climbing capacity of the i-th thermal power unit.

5. The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy as claimed in claim 1, characterized in that: The adjusting, based on the second power generation prediction result and the initial power generation plan of the new energy power generation system, the initial power generation plan of the cogeneration unit and the initial plan of the temporary power purchase comprises: Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result; Based on the second power generation prediction value and the first power generation prediction value at each sampling time in the initial power generation plan of the new energy power generation system, calculating the power generation prediction difference between the current day prediction and the advance prediction; If the power generation prediction difference is less than zero, then determining the increased power generation value of each thermal power unit based on the ramp rate of each thermal power unit in the cogeneration unit; If the total power generation value increased by all thermal power units is less than the absolute value of the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value increased and the absolute value of the power generation prediction difference.

6. The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy as claimed in claim 5, characterized in that: After calculating the difference between the current day's prediction and the advance prediction of the generated power, the scheduling method further includes: If the power generation prediction difference is greater than zero, then based on the ramp rate of each thermal power unit in the cogeneration unit, determining the power generation value to be reduced for each thermal power unit; If the total power generation value reduced by all thermal power units is less than the power generation prediction difference, the temporary power purchase amount in the initial plan of temporary power purchase is adjusted based on the difference between the total power generation value reduced and the power generation prediction difference.

7. The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy as claimed in claim 5 or 6, characterized in that: The obtaining of the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day includes: Based on the adjusted power generation value of each thermal power unit in the cogeneration unit, modify the initial power generation plan corresponding to the cogeneration unit to obtain the power generation plan of the cogeneration unit for the day; Based on the adjustment value of the temporary power purchase amount, modify the initial plan of temporary power purchase to obtain a temporary power purchase plan for the day; The method for dispatching a self-provided power plant for the electrolytic aluminum industry taking into account the consumption of new energy sources also includes: Obtaining a second power generation prediction value corresponding to the new energy power generation system at each sampling time from the second power generation prediction result; Based on the second power generation prediction value, the initial power generation plan corresponding to the new energy power generation system is adjusted to obtain the power generation plan of the new energy power generation system for the day.

8. A self-provided power plant dispatching device for the electrolytic aluminum industry taking into account the consumption of new energy, wherein the self-provided power plant includes a cogeneration unit and a new energy power generation system, characterized in that: include: A basic data acquisition module is used to obtain the total power consumption plan of the power-consuming enterprise, the industrial steam consumption plan of the cogeneration unit, the power purchase plan of the power grid and the power forecast result of the new energy power generation system, wherein the power forecast result of the new energy power generation system includes a first power generation forecast result predicted in advance and a second power generation forecast result predicted on the same day, and both the advance forecast and the same day forecast include multiple sampling moments; A third power generation prediction module is used to construct power balance constraints and cogeneration unit constraints based on the total power consumption plan, the industrial steam consumption plan, the power grid purchase plan and the first power generation prediction result, and solve the third power generation prediction result corresponding to the minimum operation cost of the cogeneration unit under the power balance constraints and the cogeneration unit constraints; an initial plan generating module, configured to generate an initial power generation plan corresponding to the cogeneration unit based on the third power generation prediction result, generate an initial power generation plan corresponding to the new energy power generation system based on the first power generation prediction result, and generate an initial plan for temporary power purchase based on the power balance constraint; A plan adjustment module is used to adjust the initial power generation plan of the cogeneration unit and the initial plan for temporary power purchase based on the second power generation power prediction result and the initial power generation plan of the new energy power generation system, so as to obtain the power generation plan of the cogeneration unit on the same day and the temporary power purchase plan on the same day.

9. A storage medium storing at least one executable instruction, wherein the executable instruction enables a processor to execute operations corresponding to the method for dispatching a self-contained power plant for the electrolytic aluminum industry taking into account new energy consumption as described in any one of claims 1-7.

10. A computer device comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to the method for dispatching a self-contained power plant for the electrolytic aluminum industry considering the consumption of new energy as described in any one of claims 1-7.

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