A high energy consumption enterprise self-provided power plant power generation and power utilization joint optimization method and system

Abstract

The application discloses a kind of high energy consumption enterprise self-provided power plant generation power combined optimization method and system, and the operation cost parameters of each kind of generator set of self-provided power plant generation side are obtained by EMS system collection typical high energy consumption enterprise self-provided power plant generation power historical data;Analysis high energy consumption enterprise self-provided power plant under the guidance of price signal generation sensitivity and load transfer sensitivity;Different generator output constraint, thermal power coupling constraint are considered respectively, and the production relationship between each kind of transferable load, adjusting characteristic, analysis high energy consumption enterprise self-provided power plant under the guidance of price signal generation cost, transferable load, net electricity fee, and form high energy consumption enterprise self-provided power plant generation power combined optimization model.The application can be widely applied to high energy consumption enterprise optimization resource allocation and load demand management technical field;Optimize the generation production strategy of high energy consumption enterprise self-provided power plant, effectively reduce enterprise electricity cost, to guide big industrial user generation production dispatching has guiding significance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy optimization scheduling of self-provided power plant of high energy consumption enterprise, and particularly relates to a method and system for combined optimization of power generation and power consumption of self-provided power plant of high energy consumption enterprise. BACKGROUND

[0002] With the rapid development of social economy, the demand for electricity increases sharply, and the power supply is often in a relatively tense state. At the same time, electric energy is an essential energy in the production process of high energy consumption enterprises. In order to improve the comprehensive utilization efficiency of energy and reduce the cost of electricity, many high energy consumption enterprises have built self-provided power plants with their own load. The electric energy required in the production process of high energy consumption enterprises is supplied by the power grid and the self-provided power plant at the same time. High energy consumption enterprises reduce the cost of electricity by building self-provided power plants, which plays a good role in energy saving, environmental protection and improving economic benefits.

[0003] The self-provided power plant of high energy consumption enterprise is generally equipped with coal-fired units, cogeneration units and resource comprehensive utilization units. The coal-fired unit has very effective adjustable characteristics in the production mode of material determining electricity; the cogeneration unit has the production mode of heat determining electricity, and can adjust the power generation according to the different units, and at the same time, the waste gas and waste heat resources are fed back to the surrounding users for heating; the resource comprehensive utilization unit utilizes the waste gas generated in the production process of high energy consumption enterprises for secondary utilization, effectively improving the energy utilization rate. The power consumption side of high energy consumption enterprises has different production equipment according to the different production processes of the industry, but the load of the power consumption side of high energy consumption enterprises can be adjusted while meeting the requirements of production process. The load adjustment of high energy consumption enterprises can reduce the dependence on external power grid, reduce the cost of electricity, and at the same time, alleviate the tension of local power grid.

[0004] According to the characteristics of power generation and power consumption of self-provided power plant of high energy consumption enterprise, the price-based demand response project is often used for industrial users. Among them, the most commonly used is time-of-use electricity price, which gives different electricity prices in different time periods to guide enterprises to generate electricity and adjust load, so as to promote large industrial users to make reasonable power generation plan and load adjustment, and promote the power grid to complete the peak clipping and valley filling work. Therefore, how to reasonably utilize the price signal under the existing economic mechanism to adjust the power generation and power consumption strategy of high energy consumption enterprise, promote the enterprise to make reasonable power generation plan and load scheduling arrangement, so that the high energy consumption enterprise meets the minimum operation cost at the same time, and explores the adjustment potential of high energy consumption enterprise to promote the power grid to complete the peak clipping and valley filling work has become a problem to be solved urgently. SUMMARY

[0005] In order to solve the problems of the existing economic mechanism under the existing technology, the power signal adjusts the power generation and consumption adjustment strategy of the self-provided power plant of the high energy consumption enterprise, promotes the enterprise to arrange the reasonable power generation plan and load scheduling, so that the high energy consumption enterprise meets the minimum operation cost, and the adjustment potential of the high energy consumption enterprise is explored to promote the power grid to complete the peak clipping and valley filling work, the present application provides a kind of high energy consumption enterprise self-provided power plant power generation and consumption combined optimization method, including:

[0006] The power generation and consumption cost and load condition of the high energy consumption enterprise self-provided power plant in each period are obtained;

[0007] The power generation and consumption cost and load condition are brought into the pre-established power generation and consumption combined optimization model for solving, and the power generation and consumption combined optimization operation method of the high energy consumption enterprise self-provided power plant is obtained;

[0008] Wherein the power generation and consumption cost includes: power purchase price, on-grid price and power generation output curve;The load condition includes: basic load and transferable load power;

[0009] The power generation and consumption combined optimization model takes the minimum operation cost of the high energy consumption enterprise self-provided power plant as the target, and considers the power generation sensitivity and load transfer sensitivity under the guidance of price signal to construct.

[0010] Preferably, the power generation and consumption cost and load condition of the high energy consumption enterprise self-provided power plant in each period are obtained, including:

[0011] The on-grid price, power purchase price and power generation cost of the high energy consumption enterprise self-provided power plant in different time are obtained:

[0012] The historical power generation output curve of the coal-fired unit, cogeneration unit and resource comprehensive utilization unit of the high energy consumption enterprise self-provided power plant, and the maximum active power, minimum active power, maximum load increase speed and maximum load decrease rate are obtained through the EMS system:

[0013] The power, operation time, maximum adjustable time basic data of the basic load and adjustable load of the high energy consumption enterprise self-provided power plant in each period are obtained through the EMS system.

[0014] Preferably, the construction of the power generation and consumption combined optimization model includes:

[0015] The power generation cost is determined based on the upper and lower limit constraints of power generation power output, generator climbing constraints and generator thermal coupling constraints of the high energy consumption enterprise self-provided power plant;

[0016] The power generation sensitivity and load transfer sensitivity of the high energy consumption enterprise self-provided power plant in each period are determined based on the power generation and consumption cost;

[0017] Based on the sensitivity of adjustable load, the load transfer cost is determined under the conditions of meeting adjustable load operation time constraint, load production time constraint, adjustable load transfer power constraint and power balance constraint of the high energy consumption enterprise self-provided power plant;

[0018] According to the generation sensitivity of the high energy consumption enterprise self-provided power plant and the load transfer sensitivity in each period, the exchange power of the high energy consumption enterprise self-provided power plant and the power grid is determined, and the net electricity fee of the high energy consumption enterprise self-provided power plant is analyzed;

[0019] The generation and consumption joint optimization model is constructed with the generation cost, load transfer cost and net electricity fee as constraint conditions and the minimum operation cost of the high energy consumption enterprise self-provided power plant as target.

[0020] Preferably, the determination of the generation sensitivity of the high energy consumption enterprise self-provided power plant in each period and the load transfer sensitivity comprises:

[0021] Based on the relationship among the power purchase price, generation cost and grid-connected price of the high energy consumption enterprise self-provided power plant in each period, the generation sensitivity in each period and the electricity price corresponding to the load at each time point are determined respectively:

[0022] Based on the generation sensitivity in each period, the load transfer sensitivity in each period is determined.

[0023] Preferably, the generation sensitivity calculation formula in each period is as follows:

[0024]

[0025] wherein, is the optimal generation power; is the power purchase price, grid-connected price and unit generation cost price in the kth period respectively; L k is the minimum generation power, maximum generation power and total load power of the enterprise in the kth period respectively;

[0026] The electricity price corresponding to the load at the kth time point is calculated as follows:

[0027]

[0028] wherein, ω k is the electricity price corresponding to the load of the enterprise at the kth time point; is the power purchase price, unit generation cost price and grid-connected price of the enterprise at the kth time point respectively.

[0029] Preferably, the generation cost calculation formula is as follows:

[0030]

[0031] wherein, min Ccost For the generation cost, K is the total scheduling period within a day, i, j, u are the number of coal-fired units, combined heat and power units, and resource comprehensive utilization units respectively, a i , b i , c i are the generation cost coefficients of coal-fired units, P i,k is the power output of the i-th coal-fired unit at k time, b r , c r are the generation cost coefficients of resource comprehensive utilization units, is the power output of the r-th resource comprehensive utilization unit at k time, a j , b j , c j are the generation cost coefficients of combined heat and power units, d j , f j , is the heating cost coefficient of the j-th combined heat and power unit, are the electric power and average thermal power of the combined heat and power unit respectively.

[0032] Preferably, the transferable load operation duration constraint calculation formula is as follows:

[0033]

[0034] Wherein, S r,k is the transferable load operation duration of load r at k time; T r,n is the rated operation duration of load r, t r,min , t r,max are the earliest start time and the latest end time of the transferable load respectively, S r,k is the running state variable of load r at k time;

[0035] The continuity transferable load production timing constraint calculation formula is as follows:

[0036]

[0037] Wherein, S r,k , S r,t , S r,t+1 are the running state variables of the transferable load r at k time, t time and t+1 time respectively;

[0038] The pre-load constraint calculation formula is as follows:

[0039]

[0040] Wherein, load r is the pre-load of load j, and only when load j completes operation, load r can start operation, S r,k , Sj,t respectively are the operating state variables of the load r and the load j;

[0041] The strong correlation load constraint calculation formula is as follows:

[0042]

[0043] Wherein, the load r and the load j have strong correlation, the load j starts running immediately after the load r works, S j,k , S j,t respectively are the operating state variables of the load j at the k time and the t time, S r,t-1 is the operating state variable of the load r at the t-1 time:

[0044] The transfer load power constraint calculation formula is as follows:

[0045]

[0046] Wherein, respectively represent the enterprise total maximum power generation in the k period and the maximum power purchase of the enterprise in the period, l r,k , respectively are the basic load and the transferable load power at the k time, N is the total transferable load quantity at the k time, S r,k is the operating state variable of the transferable load r at the k time:

[0047] The power balance constraint calculation formula is as follows:

[0048]

[0049] Wherein, P k , E k respectively represent the enterprise total power generation in the k period and the power purchase, l r,k , respectively are the basic load and the transferable load power at the k time, N is the total transferable load quantity at the k time, S r,k is the operating state variable of the transferable load r at the k time.

[0050] Preferably, the load transfer cost calculation formula is as follows:

[0051]

[0052] Wherein, is the load r transfer cost, represents the unit time cost of the load r respectively backward and forward transfer, S r , s r respectively represent the original planned start time and the start time after transfer of the load r, The regulation cost of the load r.

[0053] Preferably, the net electricity fee is calculated as follows:

[0054]

[0055] Wherein, B k is the net electricity fee of the enterprise in the kth period; is the electricity purchase price and the grid-connected electricity price in the kth period; P k , L k are the total power generation and the total load of the enterprise in the period, respectively.

[0056] Preferably, the minimum operation cost is calculated as follows:

[0057]

[0058] Wherein, F is the operation cost, N is the number of transferable load, K is the total scheduling period in a day, I and J are the number of coal-fired units and cogeneration units, respectively, B k , C i (P i,k ), are the transferable load cost, the net electricity fee, the coal-fired unit power generation cost and the cogeneration unit power generation cost, respectively.

[0059] Based on the same inventive concept, the application further provides a high-energy-consumption enterprise self-provided power plant generation and consumption joint optimization system, comprising:

[0060] An acquisition module is configured to acquire the generation and consumption cost and the load condition of the high-energy-consumption enterprise self-provided power plant in each period;

[0061] An optimization solution module is configured to bring the generation and consumption cost and the load condition into a pre-established generation and consumption joint optimization model to obtain a generation and consumption joint optimization operation method of the high-energy-consumption enterprise self-provided power plant.

[0062] Wherein, the generation and consumption cost comprises the electricity purchase price, the grid-connected electricity price, the power generation cost and the power generation output curve; and the load condition comprises the basic load and the transferable load power.

[0063] The generation and consumption joint optimization model takes the minimum operation cost of the high-energy-consumption enterprise self-provided power plant as the target and is constructed by considering the power generation sensitivity and the load transfer sensitivity under the guidance of the price signal.

[0064] Compared with the prior art, the application has the following beneficial effects:

[0065] The application provides a high-energy-consumption enterprise self-provided power plant generation and power utilization joint optimization method and system, which comprises the following steps: obtaining generation and power utilization costs and load conditions of the high-energy-consumption enterprise self-provided power plant in each period; bringing the generation and power utilization costs and the load conditions into a pre-established generation and power utilization joint optimization model to obtain a high-energy-consumption enterprise self-provided power plant generation and power utilization joint optimization operation method; wherein the generation and power utilization costs comprise a power purchase price, a grid-connected power price, a generation cost and a generation output curve; the load conditions comprise a basic load and a transferable load power; the generation and power utilization joint optimization model is constructed by taking the minimum operation cost of the high-energy-consumption enterprise self-provided power plant as the target and considering generation sensitivity and load transfer sensitivity under the guiding action of a price signal; the application establishes a high-energy-consumption enterprise self-provided power plant generation and power utilization joint optimization model, studies generation and power utilization strategies of the high-energy-consumption enterprise self-provided power plant under different price signals, can provide effective reference for the power grid when a price-based demand response mechanism is formulated, better explores the regulation potential of the high-energy-consumption enterprise self-provided power plant, and enables the given price signal to better play a role in peak load shifting, thereby improving the stability of power grid operation.

[0066] The technical scheme provided by the application studies generation strategies and power utilization strategies of the high-energy-consumption enterprise self-provided power plant under a price signal, can provide effective reference for generation output planning and load transfer of the high-energy-consumption enterprise self-provided power plant; meanwhile, a generation and power utilization joint optimization operation model of the high-energy-consumption enterprise self-provided power plant with the minimum operation cost as the target is established, which can ensure that the enterprise reduces the power utilization cost as much as possible while not affecting the normal production planning of the enterprise; by responding to the guidance of the price signal of the power grid, the generation planning and load transfer production planning of the high-energy-consumption enterprise self-provided power plant are adjusted, the interactivity of the high-energy-consumption enterprise and the power grid is improved, the reliability of power utilization of the high-energy-consumption enterprise is promoted, and the safety of production operation is ensured. The application has guiding significance for guiding orderly power utilization of the high-energy-consumption enterprise self-provided power plant.

[0067] The relationship among the generation cost, the grid-connected power price and the power purchase price of the self-provided power plant in each period can determine the optimal generation planning of the self-provided power plant; the load power utilization cost in each period is studied, the sensitivity of load transfer is studied, and a minimum operation cost model with three targets of the generation cost, the load transfer cost and the net power cost of the self-provided power plant is established by considering the load transfer cost. The generation output strategy and the load transfer strategy of the self-provided power plant are obtained. The unreasonable power utilization of the current self-provided power plant is optimized; and the generation and power utilization behavior of the self-provided power plant can be studied, the designated power price of the micro-grid is provided with support; the power grid can also change the grid-connected power price in the peak period to promote the generation and power utilization adjustment of the self-provided power plant and promote the power grid to complete the peak load shifting work. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 A high-energy-consumption enterprise self-provided power plant generation and power utilization joint optimization method flow chart is provided for the application.

[0069] Figure 2 A flowchart for solving the specific implementation scheme provided in Example 1;

[0070] Figure 3 This is a structural block diagram of a combined power generation and consumption optimization system for a self-owned power plant of a high-energy-consuming enterprise provided by the present invention. DETAILED DESCRIPTION

[0071] In order to better understand the present invention, the present invention is further described below with reference to the accompanying drawings and examples.

[0072] Example 1

[0073] like Figure 1 As shown, the present invention provides a method for optimizing power generation and consumption of a typical high-energy-consuming enterprise's self-owned power plant based on price signal guidance, comprising the following steps:

[0074] Step 1: Obtain the electricity generation and consumption costs and load conditions of the self-owned power plants of high-energy-consuming enterprises in each time period; the electricity generation and consumption costs include: electricity purchase price, grid-connected electricity price and power generation output curve; the load conditions include: base load and transferable load power;

[0075] Step 2: Bring the power generation and consumption costs and load conditions into a pre-established power generation and consumption joint optimization model for solution, and obtain the power generation and consumption joint optimization operation method of the self-owned power plant of the high-energy-consuming enterprise; the power generation and consumption joint optimization model is constructed with the minimum operating cost of the self-owned power plant of the high-energy-consuming enterprise as the goal, considering the power generation sensitivity and load transfer sensitivity under the guidance of price signals.

[0076] The specific steps of this embodiment are:

[0077] S1: Obtain the electricity purchase price, grid-connected electricity price, power generation cost, and power output curve of the self-owned power plants of high-energy-consuming enterprises in each period; the base load and transferable load power in each period; S2: Analyze the power generation sensitivity and load transfer sensitivity of the self-owned power plants of high-energy-consuming enterprises under the guidance of price signals;

[0078] S3: Establish a joint optimization model for power generation and consumption of self-owned power plants of high-energy-consuming enterprises guided by price signals;

[0079] S4: Use the GUROBI software package in MATLAB to solve the power generation and consumption operation strategy of the self-owned power plant of high-energy-consuming enterprises.

[0080] like Figure 2 As shown, in step S1 of this embodiment, the power purchase price, grid-connected power price, power generation cost and power generation output curve of the self-owned power plant of the high-energy-consuming enterprise in each time period are obtained; the specific steps of the base load and transferable load power in each time period are as follows:

[0081] S1-1: Obtain the online electricity price, electricity purchase price and power generation cost of the high energy consumption enterprise self-provided power plant at different time.

[0082] S1-2: Obtain the power generation output curve of the coal-fired unit, combined heat and power unit and resource comprehensive utilization unit of the high energy consumption enterprise self-provided power plant, as well as the maximum active power, minimum active power, maximum load increase speed and maximum load decrease speed through EMS.

[0083] S1-3: Obtain the power, operation time and maximum adjustable time basic data of the basic load and adjustable load of the high energy consumption enterprise self-provided power plant at each time period through EMS.

[0084] The specific steps of analyzing the power generation sensitivity and load transfer sensitivity of the high energy consumption enterprise self-provided power plant under the guidance of the price signal in step S2 of the embodiment are as follows:

[0085] S2-1: Determine the relationship among the electricity purchase price, power generation cost and online electricity price of the high energy consumption enterprise self-provided power plant at each time period, and analyze the power generation sensitivity of the high energy consumption enterprise self-provided power plant:

[0086]

[0087] wherein, are the electricity purchase price, online electricity price and power generation cost in the kth time period, respectively; L k , are the minimum power generation power, maximum power generation power, total load power and optimal power generation power of the enterprise in the kth time period, respectively:

[0088] S2-2: Based on the power generation sensitivity of the high energy consumption enterprise self-provided power plant at each time period, analyze the adjustable load sensitivity:

[0089] The output of the power generation unit is determined by the size relationship among the power generation cost, online electricity price and electricity purchase price, and under the satisfaction of the related output constraints. Therefore, under the guidance of the real-time electricity price or time-of-use electricity price, the self-provided power plant will adjust the sensitivity according to the price relationship among the three. The unit cost of the load power in the current time period can be determined by the relationship among the power generation cost, online electricity price and electricity purchase price. Further, through the guidance of the price signal, the power consumption behavior of the self-provided power plant is changed. The adjustable load is adjusted according to the change of the price. For example: any two dispatching time periods k' and k", if the transferable load can be transferred from the time period with a larger ω k to the time period with a smaller ω k , the power consumption cost of the enterprise will be reduced, and vice versa. The calculation of ω k is as follows:

[0090]

[0091] Among them, ω k is the electricity price corresponding to the enterprise's load at the kth moment.

[0092] In step S3 of this embodiment, the specific steps for analyzing and establishing a power generation and consumption joint optimization model for a self-owned power plant of a high-energy-consuming enterprise under the guidance of price signals are as follows:

[0093] S3-1: Analyze the power generation cost of a self-owned power plant of a high-energy-consuming enterprise under the conditions of meeting the upper and lower limits of power output, generator ramping constraints, and generator thermal coupling constraints:

[0094]

[0095] Among them, K is the total dispatch period in a day, I, J, and u are the number of coal-fired units, cogeneration units, and resource comprehensive utilization units, respectively. i 、b i 、c i are the power generation cost coefficients of coal-fired units, P i,k is the power output of the i-th coal-fired unit at time k, b r 、c r are the power generation cost coefficients of resource comprehensive utilization units, For comprehensive resource utilization, the power output of unit r at time k, a j 、b j 、c j are the power generation cost coefficients of the cogeneration unit, d j 、f j 、h j is the heating cost coefficient of the jth cogeneration unit, They are the electric power and average thermal power of the cogeneration unit respectively:

[0096] Upper and lower limits of power generation:

[0097]

[0098] in, are the minimum power generation, maximum power generation, and real-time power generation of the jth cogeneration unit, P i,min 、P i,max 、P i are the minimum power generation, maximum power generation, and real-time power generation of the i-th coal-fired unit respectively:

[0099] Climbing constraints:

[0100]

[0101] Among them, D i,down 、D i,up 、Dj,down , D j,down are the downward and upward ramp rates of coal-fired units and cogeneration units, respectively, P i,k , P i,(k-1) , are the power outputs of the i-th coal-fired unit and the j-th cogeneration unit at time k and k-1, respectively:

[0102] Thermal-electric coupling constraints:

[0103]

[0104] where P CHP , H CHP are the power generation and heat generation of the cogeneration unit, respectively, are the maximum and minimum power generation of the unit in the pure condensing condition; c v , c m are the intake and back pressure of the unit:

[0105] S3-2: Based on the sensitivity of adjustable load, analyze the load transfer cost of self-provided power plant of high energy-consuming enterprises under the constraints of adjustable load operation time, production time sequence between loads, adjustable load transfer power, and power balance:

[0106]

[0107] where, represent the unit time cost of load r respectively transferred backward and forward, S r , s r represent the planned start time and the start time after transfer of load r, represents the adjustment cost of load r:

[0108] Transferable load operation time constraint:

[0109]

[0110] where T r,n is the rated operation time of load r, t r,min , t r,max are the earliest start time and the latest end time of the transferable load, S r,k is the operation state 0, 1 variable of load r at time k, operation is 1 and stop is 0:

[0111] Continuous transferable load production time sequence constraint:

[0112]

[0113] where S r,k , Sr,t , S r,t+1 respectively are the operating state variables of the transferable load r at the kth moment, t moment, t+1 moment:

[0114] Preceding load constraint:

[0115]

[0116] Wherein, the load r is the preceding load of the load j, only when the load j completes operation, the load r can start operation, S r,k , S j,t respectively are the operating state variables of the load r and the load j:

[0117] Strong correlation load constraint:

[0118]

[0119] Wherein, the load r and the load j have strong correlation, the load j starts operation immediately after the load r works, S j,k , S j,t respectively are the operating state variables of the load j at k moment and t moment, S r,t-1 is the operating state variable of the load r at t-1 moment:

[0120] Transferable load power constraint:

[0121]

[0122] Wherein, respectively represent the total maximum power generation of the enterprise in the k period and the maximum power purchase of the enterprise in the period, l r,k , respectively are the basic load and the transferable load power at the kth moment, N is the total transferable load quantity at the kth moment, S r,k is the operating state variable of the transferable load r at the kth moment:

[0123] Power balance constraint:

[0124]

[0125] Wherein, P k , E k respectively represent the total power generation of the enterprise in the k period and the power purchase, l r,k , respectively are the basic load and the transferable load power at the kth moment, N is the total transferable load quantity at the kth moment, S r,k is the operating state variable of the transferable load r at the kth moment;

[0126] S3-3: According to the high energy consumption enterprise self-provided power plant power generation sensitivity and the load transfer sensitivity in each period, the exchange power of the high energy consumption enterprise self-provided power plant and the power grid is determined, and the net electricity fee of the high energy consumption enterprise self-provided power plant is analyzed:

[0127]

[0128] Wherein, B k is the net electricity fee of the enterprise in the k period; is the electricity purchase price and the on-grid electricity price in the k period; P k , L k are the total power generation and the total load of the enterprise in the period respectively:

[0129] S3-4: According to the power generation cost, the load transfer cost and the net electricity fee of the high energy consumption enterprise self-provided power plant, a joint optimization model of power generation and power utilization of the high energy consumption enterprise self-provided power plant is constructed, which meets the above constraints and takes the minimum operation cost as the target:

[0130]

[0131] Wherein, N is the number of transferable loads, K is the total scheduling period in a day, I and J are the number of coal-fired units and cogeneration units respectively, B k , C i (P i,k ), are the transferable load cost, the net electricity fee, the coal-fired unit power generation cost and the cogeneration unit power generation cost respectively:

[0132] The constraint conditions are composed of the power generation cost constraint condition of the high energy consumption enterprise self-provided power plant, the load transfer constraint condition and the net electricity fee constraint condition.

[0133] The specific steps of solving the power generation and utilization operation strategy of the high energy consumption enterprise self-provided power plant by using the GUROBI software package in MATLAB in step S4 of the embodiment are as follows:

[0134] S4-1: Read the basic power generation equipment and power utilization equipment parameters, the scheduling period, the power generation cost coefficient, the load transfer cost coefficient and other basic data:

[0135] S4-2: Linearize and input the power generation constraint condition, the load transfer constraint condition and the like:

[0136] S4-3: Call the mixed integer nonlinear programming software to solve the power generation strategy and the load transfer strategy of the joint optimization model of the high energy consumption enterprise self-provided power plant:

[0137] S4-4: End.

[0138] The embodiment takes a steel industry self-provided power plant as an example, and calculates the power generation and power consumption strategy and operation cost of the steel enterprise self-provided power plant under two kinds of on-grid power prices in peak period respectively; the power consumption cost and peak load shifting of the steel enterprise under the guidance of two kinds of price signals are compared, and the results are shown in Table 1.

[0139] Table 1 power consumption cost and peak load shifting of steel enterprise under different on-grid power prices

[0140]

[0141] After changing the on-grid power price in peak period, the steel enterprise self-provided power plant shifts the load for production, the total power consumption does not change, the power generation side increases the peak period unit output, and the total power generation of the self-provided power plant is increased. At the same time, the dispatching of the transferable load promotes the power grid to complete the peak load shifting work, and the increase of the on-grid power of the generator set in the peak period also promotes the safe and stable operation of the power grid.

[0142] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above-mentioned embodiments, and in various high energy consumption enterprise self-provided power plants and various price signals, the optimal power generation and power consumption regulation strategy of the high energy consumption enterprise in the minimum operation cost mode can be obtained.

[0143] Embodiment 2

[0144] Based on the same inventive concept, the application further provides a high energy consumption enterprise self-provided power plant power generation and power consumption joint optimization system, as shown in Figure 3 , comprising:

[0145] An acquisition module is configured to acquire the power generation and power consumption cost and load condition of the high energy consumption enterprise self-provided power plant in each period;

[0146] An optimization solving module is configured to establish a power generation and power consumption sensitivity model of the high energy consumption enterprise self-provided power plant, and bring the power generation and power consumption cost and load condition into a pre-established power generation and power consumption joint optimization model for solving, so as to obtain a power generation and power consumption joint optimization operation method of the high energy consumption enterprise self-provided power plant;

[0147] The sensitivity model comprises: a power generation sensitivity model construction of the high energy consumption enterprise self-provided power plant under the guidance of power generation and power consumption cost, and a load transfer sensitivity model construction;

[0148] The power generation and power consumption joint optimization model comprises: a high energy consumption enterprise self-provided power plant power generation and power consumption joint optimization model constructed with the minimum operation cost of the high energy consumption enterprise self-provided power plant as a target.

[0149] The acquisition module comprises: a power generation and power consumption price information acquisition unit and a power generation and power consumption load information acquisition unit;

[0150] The power generation and power consumption price information acquisition unit is configured to acquire a power purchase price, a grid feed-in price, and a unit power generation cost.

[0151] The power generation and power consumption load information acquisition unit is configured to acquire a basic load and a transferable load power.

[0152] The optimization solving module includes a power generation and power consumption sensitivity analysis unit and a power generation and power consumption joint optimization model construction and solving unit.

[0153] The power generation and power consumption sensitivity analysis unit is configured to determine, based on a relationship between a power purchase price, a power generation cost, and a grid feed-in price of a self-provided power plant of a high energy consumption enterprise in each time period, a power generation sensitivity of each time period and a power consumption price corresponding to a load at each time; and determine, based on the power generation sensitivity of each time period, a load transfer sensitivity of each time period.

[0154] The power generation and power consumption joint optimization model construction and solving unit includes a model construction subunit and a calculation subunit.

[0155] The model construction subunit is configured to:

[0156] The power generation cost is determined based on a constraint condition that the self-provided power plant of the high energy consumption enterprise meets a power output upper and lower limit constraint, a generator set climbing constraint, and a thermal power coupling constraint.

[0157] The power generation sensitivity of the self-provided power plant of the high energy consumption enterprise and the load transfer sensitivity in each time period are determined based on a power generation and power consumption cost.

[0158] The load transfer cost is determined based on the sensitivity of the adjustable load, considering a constraint condition that the self-provided power plant of the high energy consumption enterprise meets an adjustable load operation duration constraint, a load production timing constraint, an adjustable load transfer power constraint, and a power balance constraint.

[0159] The exchange power of the self-provided power plant of the high energy consumption enterprise and the power grid is determined according to the power generation sensitivity of the self-provided power plant of the high energy consumption enterprise and the load transfer sensitivity in each time period, and the net electricity fee of the self-provided power plant of the high energy consumption enterprise is analyzed; a power generation and power consumption joint optimization model is constructed with the power generation cost, the load transfer cost, and the net electricity fee as constraint conditions and with a minimum operation cost of the self-provided power plant of the high energy consumption enterprise as a target.

[0160] The calculation subunit is configured to: perform optimization solving on the power generation and power consumption joint optimization model constructed by the model construction subunit according to data acquired by the acquisition module to obtain a power generation and power consumption joint optimization operation strategy of the self-provided power plant.

[0161] The power generation and power consumption joint optimization operation strategy includes a power generation strategy, a load transfer strategy, and a net electricity fee transaction strategy.

[0162] It should be noted that the objective function, constraint condition, and calculation method used in the model constructed by the embodiment can refer to those of Embodiment 1, which will not be repeated here.

[0163] Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0164] Those skilled in the art should clearly understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0165] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more flows and / or blocks.

[0166] These computer program instructions can also be stored in a computer readable storage medium that can direct the computer or other programmable data processing devices to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including an instruction apparatus that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more flows and / or blocks.

[0167] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable data processing device to produce a computer implemented process, so that the instructions executed on the computer or other programmable data processing device provide a process for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that carries out the functions specified in one or more flows and / or blocks.

[0168] The above merely illustrates the embodiments of the present application, but should not be taken as limitations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall into the protection scope of the present application.

Claims

1. A high energy consumption enterprise self-provided power plant power generation and power utilization combined optimization method, characterized in that, The application relates to a high-energy-consumption enterprise self-provided power plant joint optimization method. The method comprises the following steps: The power generation and consumption cost and the load condition of the high-energy-consumption enterprise self-provided power plant in each period are acquired; The power generation and consumption cost and the load condition are brought into a pre-established power generation and consumption joint optimization model to obtain the high-energy-consumption enterprise self-provided power plant power generation and consumption joint optimization operation method; The power generation and consumption cost comprises a power purchase price, a grid-connected power price and a power generation output curve; and the load condition comprises basic load and transferable load power; The power generation and consumption joint optimization model takes the minimum operation cost of the high-energy-consumption enterprise self-provided power plant as a target, and is constructed by considering power generation sensitivity and load transfer sensitivity under the guiding action of a price signal; The construction of the power generation and consumption joint optimization model comprises the following steps: The power generation cost of the high-energy-consumption enterprise self-provided power plant is determined based on the conditions of satisfying power generation power output upper and lower limit constraints, generator set climbing constraints and thermal power coupling constraints of the generator set; The power generation sensitivity of the high-energy-consumption enterprise self-provided power plant and the load transfer sensitivity in each period are determined based on the power generation and consumption cost; The load transfer cost of the high-energy-consumption enterprise self-provided power plant is determined based on the sensitivity of adjustable load, by considering the conditions of satisfying adjustable load operation time length constraints, load production time sequence constraints, adjustable load transfer power constraints and power balance constraints; The exchange power of the high-energy-consumption enterprise self-provided power plant and the power grid is determined according to the power generation sensitivity of the high-energy-consumption enterprise self-provided power plant and the load transfer sensitivity in each period, and the net electricity fee of the high-energy-consumption enterprise self-provided power plant is analyzed; The power generation and consumption joint optimization model is constructed by taking the power generation cost, the load transfer cost and the net electricity fee as constraint conditions and taking the minimum operation cost of the high-energy-consumption enterprise self-provided power plant as a target; wherein, is the cost of load r shifting, denotes the cost per unit time of load r shifting backward and forward respectively, S r , s r denote the original planned start time and the shifted start time of load r respectively, denotes the regulation cost of load r; The calculation formula of the load transfer cost is as follows: Wherein, S r,k is the load r in the k moment can transfer load operation duration; T r,n is the rated operation duration of load r, t r,min , r,max respectively, the earliest start time and the latest end time of the transferable load, S r,k is the load r in the k moment operation state variable; The calculation formula of the adjustable load operation time length constraint is as follows: wherein S r,k , S r,t , S r,t+1 are the operating state variables of the transferable load r at the kth moment, the tth moment, and the t+1th moment, respectively. The calculation formula of the continuous adjustable load production time sequence constraint is as follows: Wherein, the load r is the pre-load of the load j, and the load r can only start running when the load j finishes running, S r,k , S j,t are the running state variables of the load r and the load j, respectively. The calculation formula of the front load constraint is as follows: Wherein, the load r and the load j exist strong correlation, the load j starts running immediately after the load r work ends, S j,k , S j,t Respectively, the running state variable of the load j at k time and t time, S r,t-1 The running state variable of the load r at t-1 time: The calculation formula of the strong correlation load constraint is as follows: wherein, respectively represent the total maximum power generation of the enterprise and the maximum power purchase of the enterprise in the period, l r,k , respectively represent the basic load and the transferable load power at the kth moment, N is the total number of transferable loads at the kth moment, S r,k is the running state variable of the transferable load r at the kth moment: The calculation formula of the transfer load power constraint is as follows: where P k , E k represent the total power generation and power purchase of the enterprise at time k, respectively, l r,k , are the basic load and transferable load power at time k, respectively, N is the total number of transferable loads at time k, and S r,k is the running state variable of transferable load r at time k.

2. The optimization method of claim 1, wherein, The calculation formula of the power balance constraint is as follows: The acquisition of the power generation and consumption cost and the load condition of the high-energy-consumption enterprise self-provided power plant in each period comprises the following steps: The grid-connected power price, the power purchase price and the power generation cost of the high-energy-consumption enterprise self-provided power plant in different time periods are acquired; The historical power generation output curve, the maximum active power output, the minimum active power output, the maximum load increase speed and the maximum load decrease speed of the coal-fired generator set, the cogeneration unit and the resource comprehensive utilization unit of the high-energy-consumption enterprise self-provided power plant are acquired through an EMS system; 3. The optimization method of claim 1, wherein, The power, the operation time length and the maximum adjustable time basic data of the basic load and the adjustable load of the high-energy-consumption enterprise self-provided power plant in each period are acquired through the EMS system. The determination of the power generation sensitivity and the load transfer sensitivity of the high-energy-consumption enterprise self-provided power plant in each period comprises the following steps: The power generation sensitivity in each period and the electricity price corresponding to the load in each time period are respectively determined based on the relationship among the power purchase price, the power generation cost and the grid-connected power price of the high-energy-consumption enterprise self-provided power plant in each period; 4. The optimization method of claim 3, wherein, The load transfer sensitivity in each period is determined based on the power generation sensitivity in each period. wherein, is the optimal power generation; respectively are the electricity purchase price, the grid electricity price, and the unit power generation cost price in the kth period; L k respectively are the minimum power generation, the maximum power generation, and the total load power of the enterprise in the kth period. The calculation formula of the power generation sensitivity in each period is as follows: ω k is the electricity price corresponding to the load of the enterprise at the kth moment; is the electricity purchase price, unit power generation cost price, and grid-connected electricity price of the enterprise at the kth moment, respectively.

5. The optimization method of claim 1, wherein, The calculation formula of the electricity price corresponding to the load in the kth time period is as follows: The calculation formula of the power generation cost is as follows: min C = min (C1, C2, C3) cost is the generation cost, K is the total scheduling period in a day, i, j, u are the number of coal-fired units, combined heat and power units and resource comprehensive utilization units respectively, a i , b i , c i are the generation cost coefficients of coal-fired units, P i,k is the generation output of the ith coal-fired unit at time k, b r , c r are the generation cost coefficients of resource comprehensive utilization units, is the generation output of the rth resource comprehensive utilization unit at time k, a j , b j , c j are the generation cost coefficients of combined heat and power units, d j , f j , h j are the heat supply cost coefficients of the jth combined heat and power unit, are the electric power and average heat power of the combined heat and power unit respectively.

6. The optimization method of claim 1, wherein, The calculation formula of the net electricity cost is as follows: Wherein, B k is the net electricity fee of the enterprise in the kth period; is the electricity purchase price and grid-connected electricity price in the kth period; P k , L k are the total power generation and total load of the enterprise in the period, respectively.

7. The optimization method of claim 3, wherein, The calculation formula of the minimum operation cost is as follows: Wherein, F is the operation cost, N is the number of transferable load, K is the total scheduling period in a day, I, J are the number of coal-fired units and cogeneration units respectively, B k , C i (P i,k ), are the transferable load cost, net electricity cost, coal-fired unit power generation cost, and cogeneration unit power generation cost respectively.

8. A high energy consumption enterprise self-provided power plant generation and power utilization combined optimization system, characterized in that, The method comprises the steps of: An acquisition module is configured to acquire the power generation and consumption cost and load condition of the high energy consumption enterprise self-provided power plant in each time period; An optimization solving module is configured to bring the power generation and consumption cost and load condition into a pre-established power generation and consumption joint optimization model for solving, so as to obtain the power generation and consumption joint optimization operation method of the high energy consumption enterprise self-provided power plant; The power generation and consumption cost comprises a power purchase price, a grid-connected price and a power generation output curve, and the load condition comprises a basic load and a transferable load power; The power generation and consumption joint optimization model is constructed by taking the minimum operation cost of the high energy consumption enterprise self-provided power plant as a target and considering the power generation sensitivity and load transfer sensitivity under the guiding action of a price signal; The construction of the power generation and consumption joint optimization model comprises: The power generation cost is determined based on the high energy consumption enterprise self-provided power plant satisfying the upper and lower limit constraints of power generation power output, the climbing constraints of a generator unit and the thermal-electric coupling constraints of the generator unit; The power generation sensitivity of the high energy consumption enterprise self-provided power plant and the load transfer sensitivity in each time period are determined based on the power generation and consumption cost; The load transfer cost is determined based on the sensitivity of adjustable load, the operation time length constraints of the adjustable load, the production time sequence constraints between loads, the transferable load transfer power constraints and the power balance constraints of the high energy consumption enterprise self-provided power plant being satisfied; The exchange power of the high energy consumption enterprise self-provided power plant and the power grid is determined according to the power generation sensitivity of the high energy consumption enterprise self-provided power plant and the load transfer sensitivity in each time period, and the net electricity cost of the high energy consumption enterprise self-provided power plant is analyzed; The power generation and consumption joint optimization model is constructed by taking the minimum operation cost of the high energy consumption enterprise self-provided power plant as a target and taking the power generation cost, the load transfer cost and the net electricity cost as constraint conditions; The calculation formula of the load transfer cost is as follows: wherein, is the cost of load r shifting, denotes the cost per unit time of load r shifting backward and forward, respectively, r , s r denote the original planned start time and the shifted start time of load r, respectively, denotes the regulation cost of load r; The calculation formula of the transferable load operation time length constraint is as follows: wherein S r,k is the transferable load operation duration of the load r at the kth moment; T r,n is the rated operation duration of the load r, t r,min , r,max are the earliest start time and the latest end time of the transferable load, respectively, S r,k is the operation state variable of the load r at the kth moment; The calculation formula of the continuous transferable load production time sequence constraint is as follows: wherein S r,k , S r,t , S r,t+1 are the operating state variables of the transferable load r at the kth moment, the tth moment, and the t+1th moment, respectively. The calculation formula of the front load constraint is as follows: Wherein, the load r is the pre-load of the load j, and the load r can only start running when the load j finishes running, S r,k , S j,t are the running state variables of the load r and the load j, respectively. The calculation formula of the strongly correlated load constraint is as follows: Wherein, the load r and the load j exist strong correlation, the load j starts running immediately after the load r work ends, S j,k , S j,t Respectively, the running state variable of the load j at k time and t time, S r,t-1 The running state variable of the load r at t-1 time: The calculation formula of the transferable load power constraint is as follows: wherein, respectively represent the total maximum power generation of the enterprise and the maximum power purchase of the enterprise in the period k, l r,k , respectively represent the basic load and the transferable load power at the kth moment, N is the total number of transferable loads at the kth moment, S r,k is the running state variable of the transferable load r at the kth moment: The calculation formula of the power balance constraint is as follows: where P k , E k represent the total power generation and power purchase of the enterprise at time k, respectively, l r,k , are the basic load and transferable load power at time k, respectively, N is the total number of transferable loads at time k, and S r,k is the operating state variable of transferable load r at time k.

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