Source-load storage configuration scheme for abundant electrolytic aluminum source network-load storage integrated project park

Abstract

The invention discloses a source-load-storage configuration scheme for an abundant electrolytic aluminum source-network-load-storage integrated project park, and belongs to the technical field of load-storage integration, and the scheme comprises the steps: calculating the total power and operation cost of an abundant electrolytic aluminum load under the condition of considering multiple constraints; the multiple constraints comprise the upper and lower limit constraints of the power of the abundant electrolytic cell series, the load shedding number constraint, the maximum adjustable time constraint of each stage, the start-stop state constraint, the load adjustment minimum interruption time constraint, the load total adjustment time constraint, the load adjustable frequency constraint and the aluminum yield constraint. When the operation cost of the system is calculated, a stochastic programming method is adopted, the weighted average value of multiple scenes is calculated, the operation efficiency of sufficient electrolytic aluminum is effectively improved, and the operation cost is reduced.

Description

Technical Field

[0001] The invention discloses a source-load-storage configuration scheme for an abundant type electrolytic aluminum source-grid-load-storage integrated project park, belonging to the technical field of load-storage integration. Background Art

[0002] Existing technologies rarely study how to consider the power regulation method based on the load characteristics of abundant electrolytic aluminum, establish a demand-side response model for electrolytic aluminum load, and use electrolytic aluminum load to consume new energy output locally and nearby, which is a problem that needs to be solved. In fact, when planning new energy sites in industrial parks, electrolytic aluminum enterprises usually have their own production plans, and participating in demand-side response puts higher requirements on the flexibility of load adjustment. In order to ensure the safe and stable operation of the system, it is necessary to comprehensively consider the coordination and complementarity of conventional unit operation, long-term production plan of electrolytic aluminum and short-term regulation characteristics, so as to effectively cope with the volatility of new energy output. Therefore, it is necessary to establish a demand-side response model for electrolytic aluminum load and apply it to the planning of new energy sites. By taking load regulation operations, electrolytic aluminum enterprises can adjust the size of their actual load according to the needs of the power grid, thereby achieving the purpose of peak shaving and valley filling, smoothing load and new energy output fluctuations. Summary of the invention

[0003] The purpose of the present invention is to provide a source-load-storage configuration plan for an abundant electrolytic aluminum source-grid-load-storage integrated project park, so as to solve the problem in the prior art that the energy configuration of abundant electrolytic aluminum needs to be optimized.

[0004] The source-load-storage configuration plan for the abundant electrolytic aluminum source-grid-load-storage integrated project park calculates the total power and operating cost of the abundant electrolytic aluminum load under the consideration of multiple constraints;

[0005] Total power of sufficient electrolytic aluminum load for:

[0006]

[0007] Where n Al is the number of electrolytic cell series included in the electrolytic aluminum load, is the real-time power of the i-th electrolyzer series;

[0008] Operating cost of sufficient electrolytic aluminum load C Al,s for:

[0009]

[0010] In the formula, c pAL is the cost coefficient of electrolytic aluminum load regulation, is the rated power of the ith electrolyzer series, T is the number of time periods, and t is the tth time period.

[0011] Multiple constraints include upper and lower power limits of the ample electrolytic cell series, load shedding quantity constraints, maximum adjustable time constraints for each stage, start and stop state constraints, minimum interruption time constraints for load regulation, total load regulation time constraints, adjustable number of load constraints and aluminum production constraints.

[0012] The upper and lower limits of the electrolytic cell series power are:

[0013]

[0014] In the formula, is the upper and lower limits of the adjustable power of the i-th electrolyzer series, is the operation state variable;

[0015] The load shedding quantity constraint is:

[0016]

[0017] The maximum adjustable time constraints of each stage are:

[0018]

[0019] t Y,s is the time when the load starts, is the maximum duration of load regulation in the corresponding stage, is the load operation state variable in time period t, Y is the load state, when Y = up, it means the load increases, when Y = down, it means the load decreases, t cut,s is the load shedding start time, is the maximum duration of the load shedding phase, and Δt is the simulation time step.

[0020] The start-stop state constraints are:

[0021]

[0022] In the formula, They are the startup action variables of each adjustment stage of the electrolytic cell series, They are the starting action variables of each adjustment stage of the electrolytic cell series at t=1, is the load operation state variable at t=1, is the stop action variable;

[0023] The minimum interruption time constraint for load regulation is:

[0024]

[0025] In the formula, is the minimum interruption time between the adjustment stages of the electrolyzer series, Indicates whether the electrolytic aluminum load has adopted load regulation operation, which is a 0-1 integer variable. The variable for stopping the action when the load increases, is the load shedding stop action variable, τ s For the period.

[0026] The total load regulation time constraint is:

[0027]

[0028] In the formula, is the load regulation in time period t, It is the maximum value of the total adjustment time of electrolytic aluminum load;

[0029] The load adjustable times are constrained as follows:

[0030]

[0031] Where M max is the maximum adjustable times of the load;

[0032] The aluminum production constraint is:

[0033]

[0034] In the formula, is the output of the aluminum smelter in period t, is a nonlinear function, It is the upper and lower limits of the output of electrolytic aluminum load within a certain period of time.

[0035] System planning and operation model objective function min C total for:

[0036] min C total =C con +C om ;

[0037] In the formula, C total is the total cost of the system, C con is the construction cost of the new energy station in the park, C om The operating cost of the power system of the entire industrial park.

[0038] Construction cost of new energy stations in the park C con for:

[0039]

[0040] In the formula, are the construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. are the unit capacity construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. PV 、n WT are the number of newly built wind power and photovoltaic units in new energy stations, is the rated capacity of the new distribution transformer, are the rated capacities of each photovoltaic cell and each wind turbine respectively, F is the capital recovery coefficient, φ is the discount rate, and L is the service life of the equipment.

[0041] The operating cost of the power system of the entire industrial park is C om Including the operating cost of new energy units C omRE,s 、Operation cost of thermal power unit C G,s , distribution transformer and interconnection line operation and maintenance costs C TL,s , Penalty cost for wind and solar power abandonment C cRE,s 、Operation cost of sufficient electrolytic aluminum load C Al,s 、 Cost of purchasing electricity from external power grid C ex,s , the formula is:

[0042]

[0043] In the formula, p s is the probability corresponding to the sth scene, n s is the total number of scenarios, each scenario refers to a typical day.

[0044] New energy unit operating cost C omRE,s for:

[0045]

[0046] In the formula, are the grid-connected power of the original photovoltaic power station and wind farm in the park in the sth scenario at time period t, are the grid-connected power of the newly built photovoltaic power station and wind farm in period t, are the operating costs per unit output of photovoltaic and wind turbines respectively;

[0047] The operating cost of thermal power units C G,s It is composed of the coal consumption cost, start-up and shutdown cost, and carbon emission penalty cost of thermal power units:

[0048]

[0049] In the formula, a k 、b k 、c k are the operating cost coefficients of the k-th thermal power unit, are the start-up and shutdown costs of the k-th thermal power unit, is the total output of the k-th thermal power unit in period t, is the operating status of the thermal power unit, which is a 0-1 integer variable. It means that the qth unit of the kth type is in the on state during the t period. Indicates that the qth unit of the kth type is in the shutdown state during the t period, n G,k is the number of k-type units, ε is the emission intensity, c tax The carbon tax to be paid per unit of CO2 emissions, Ω G A collection of models of thermal power units.

[0050] Distribution transformer and interconnection line operation and maintenance cost C TL,s for:

[0051]

[0052] In the formula, is the operating capacity of the distribution transformer in period t, The unit capacity operation and maintenance cost of distribution transformers and interconnection lines;

[0053] Penalty cost for wind and solar curtailment C cRE,s for:

[0054]

[0055] In the formula, is the penalty cost coefficient for unit wind and solar power abandonment, are the predicted power of the original photovoltaic power station and wind farm in period t, is the predicted power of the newly built photovoltaic power station and wind farm in period t;

[0056] External power grid purchase cost C ex,s for:

[0057]

[0058] In the formula, c buy The price of electricity purchased from the power grid for the industrial park, The power purchased for the industrial park.

[0059] Compared with the prior art, the present invention has the following beneficial effects: when calculating the operating cost of the system, the present invention adopts a random programming method to calculate the weighted average of multiple scenarios, thereby effectively improving the operating efficiency of abundant electrolytic aluminum and reducing the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 This is the equivalent circuit diagram of the ample type electrolytic aluminum load. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] The source-load-storage configuration plan for the abundant electrolytic aluminum source-grid-load-storage integrated project park calculates the total power and operating cost of the abundant electrolytic aluminum load under the consideration of multiple constraints;

[0063] Total power of sufficient electrolytic aluminum load for:

[0064]

[0065] Where n Al is the number of electrolytic cell series included in the electrolytic aluminum load, is the real-time power of the i-th electrolyzer series;

[0066] Operating cost of sufficient electrolytic aluminum load C Al,s for:

[0067]

[0068] In the formula, c pAL is the cost coefficient of electrolytic aluminum load regulation, is the rated power of the ith electrolyzer series, T is the number of time periods, and t is the tth time period.

[0069] Multiple constraints include upper and lower power limits of the ample electrolytic cell series, load shedding quantity constraints, maximum adjustable time constraints for each stage, start and stop state constraints, minimum interruption time constraints for load regulation, total load regulation time constraints, adjustable number of load constraints and aluminum production constraints.

[0070] The upper and lower limits of the electrolytic cell series power are:

[0071]

[0072] In the formula, is the upper and lower limits of the adjustable power of the i-th electrolyzer series, is the operation state variable;

[0073] The load shedding quantity constraint is:

[0074]

[0075] The maximum adjustable time constraints of each stage are:

[0076]

[0077] t Y,s is the time when the load starts, is the maximum duration of load regulation in the corresponding stage, is the load operation state variable in time period t, Y is the load state, when Y = up, it means the load increases, when Y = down, it means the load decreases, t cut,s is the load shedding start time, is the maximum duration of the load shedding phase, and Δt is the simulation time step.

[0078] The start-stop state constraints are:

[0079]

[0080] In the formula, They are the startup action variables of each adjustment stage of the electrolytic cell series, They are the starting action variables of each adjustment stage of the electrolytic cell series at t=1, is the load operation state variable at t=1, is the stop action variable;

[0081] The minimum interruption time constraint for load regulation is:

[0082]

[0083] In the formula, is the minimum interruption time between the adjustment stages of the electrolyzer series, Indicates whether the electrolytic aluminum load has adopted load regulation operation, which is a 0-1 integer variable. The variable for stopping the action when the load increases, is the load shedding stop action variable, τ s For the period.

[0084] The total load regulation time constraint is:

[0085]

[0086] In the formula, is the load regulation in time period t, It is the maximum value of the total adjustment time of electrolytic aluminum load;

[0087] The load adjustable times are constrained as follows:

[0088]

[0089] Where M max is the maximum adjustable times of the load;

[0090] The aluminum production constraint is:

[0091]

[0092] In the formula, is the output of the aluminum smelter in period t, is a nonlinear function, It is the upper and lower limits of the output of electrolytic aluminum load within a certain period of time.

[0093] System planning and operation model objective function min C total for:

[0094] min C total =C con +C om ;

[0095] In the formula, C total is the total cost of the system, C con is the construction cost of the new energy station in the park, C om The operating cost of the power system of the entire industrial park.

[0096] Construction cost of new energy stations in the park C con for:

[0097]

[0098] In the formula, are the construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. are the unit capacity construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. PV 、n WT are the number of newly built wind power and photovoltaic units in new energy stations, is the rated capacity of the new distribution transformer, are the rated capacities of each photovoltaic cell and each wind turbine respectively, F is the capital recovery coefficient, φ is the discount rate, and L is the service life of the equipment.

[0099] The operating cost of the power system of the entire industrial park is C om Including the operating cost of new energy units C omRE,s 、Operation cost of thermal power unit C G,s , distribution transformer and interconnection line operation and maintenance costs C TL,s , Penalty cost for wind and solar power abandonment C cRE,s 、Operation cost of sufficient electrolytic aluminum load C Al,s 、 Cost of purchasing electricity from external power grid C ex,s , the formula is:

[0100]

[0101] In the formula, p s is the probability corresponding to the sth scene, n s is the total number of scenarios, each scenario refers to a typical day.

[0102] New energy unit operating cost C omRE,s for:

[0103]

[0104] In the formula, are the grid-connected power of the original photovoltaic power station and wind farm in the park in the sth scenario at time period t, are the grid-connected power of the newly built photovoltaic power station and wind farm in period t, are the operating costs per unit output of photovoltaic and wind turbines respectively;

[0105] The operating cost of thermal power units C G,s It is composed of the coal consumption cost, start-up and shutdown cost, and carbon emission penalty cost of thermal power units:

[0106]

[0107] In the formula, a k 、b k 、c k are the operating cost coefficients of the k-th thermal power unit, are the start-up and shutdown costs of the k-th thermal power unit, is the total output of the k-th thermal power unit in period t, is the operating status of the thermal power unit, which is a 0-1 integer variable. It means that the qth unit of the kth type is in the on state during the t period. Indicates that the qth unit of the kth type is in the shutdown state during the t period, n G,k is the number of k-type units, ε is the emission intensity, c tax The carbon tax to be paid per unit of CO2 emissions, Ω G A collection of models of thermal power units.

[0108] Distribution transformer and interconnection line operation and maintenance cost C TL,s for:

[0109]

[0110] In the formula, is the operating capacity of the distribution transformer in period t, The unit capacity operation and maintenance cost of distribution transformers and interconnection lines;

[0111] Penalty cost for wind and solar curtailment C cRE,s for:

[0112]

[0113] In the formula, is the penalty cost coefficient for unit wind and solar power abandonment, are the predicted power of the original photovoltaic power station and wind farm in period t, is the predicted power of the newly built photovoltaic power station and wind farm in period t;

[0114] External power grid purchase cost C ex,s for:

[0115]

[0116] In the formula, c buy The price of electricity purchased from the power grid for the industrial park, The power purchased for the industrial park.

[0117] The equivalent circuit of electrolytic aluminum load is as follows Figure 1 As shown, it includes an on-load voltage-changing transformer, a saturated reactor, a rectifier bridge, a resistor and a grounding terminal. The present invention uses the coordination between the new energy station and the thermal power unit to supply power to the electrolytic aluminum load. The power shortage of the park can be purchased from the external power grid. Combined with the real-time power regulation of the electrolytic aluminum enterprise, it can effectively improve the utilization rate of new energy, reduce the output and carbon emissions of the thermal power unit, and improve the environmental benefits of system planning and operation.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features may be replaced by equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park is characterized by: Calculate the total power and operating cost of a surplus aluminum smelter load taking into account multiple constraints; Total power of sufficient electrolytic aluminum load for: Where n Al is the number of electrolytic cell series included in the electrolytic aluminum load, is the real-time power of the i-th electrolyzer series; Operating cost of sufficient electrolytic aluminum load C Al,s for: In the formula, c pAL is the cost coefficient of electrolytic aluminum load regulation, is the rated power of the ith electrolyzer series, T is the number of time periods, and t is the tth time period; The operating costs of ample electrolytic aluminum load include smelting raw material costs and labor and financial costs.

2. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 1 is characterized in that: Multiple constraints include upper and lower power limits of the ample electrolytic cell series, load shedding quantity constraints, maximum adjustable time constraints for each stage, start and stop state constraints, minimum interruption time constraints for load regulation, total load regulation time constraints, adjustable number of load constraints and aluminum production constraints.

3. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 2 is characterized in that: The upper and lower limits of the electrolytic cell series power are: In the formula, is the upper and lower limits of the adjustable power of the i-th electrolyzer series, is the operation state variable; The load shedding quantity constraint is: The maximum adjustable time constraints of each stage are: t Y,s is the time when the load starts, is the maximum duration of load regulation in the corresponding stage, is the load operation state variable in time period t, Y is the load state, when Y = up, it means the load increases, when Y = down, it means the load decreases, t cut,s is the time when load shedding starts, is the maximum duration of the load shedding phase, and Δt is the simulation time step.

4. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 3 is characterized in that: The start-stop state constraints are: In the formula, They are the startup action variables of each adjustment stage of the electrolytic cell series, They are the starting action variables of each adjustment stage of the electrolytic cell series at t=1, is the load operation state variable at t=1, is the stop action variable; The minimum interruption time constraint for load regulation is: In the formula, is the minimum interruption time between the adjustment stages of the electrolyzer series, Indicates whether the electrolytic aluminum load has adopted load regulation operation, which is a 0-1 integer variable. The variable for stopping the action when the load increases. is the load shedding stop action variable, τ s For the period.

5. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 4 is characterized in that: The total load regulation time constraint is: In the formula, is the load regulation in time period t, It is the maximum value of the total adjustment time of electrolytic aluminum load; The load adjustable times are constrained as follows: Where M max is the maximum adjustable times of the load; The aluminum production constraint is: In the formula, is the output of the aluminum smelter in period t, is a nonlinear function, It is the upper and lower limits of the output of electrolytic aluminum load within a certain period of time.

6. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 5 is characterized in that: System planning and operation model objective function min C total for: my C total =C con +C om ; In the formula, C total is the total cost of the system, C con is the construction cost of the new energy station in the park, C om The operating cost of the power system of the entire industrial park.

7. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 6 is characterized in that: Construction cost of new energy stations in the park C con for: In the formula, are the construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. are the unit capacity construction costs of photovoltaic power stations, wind farms, and distribution transformers, respectively. PV 、n WT are the number of newly built wind power and photovoltaic units in new energy stations, is the rated capacity of the new distribution transformer, are the rated capacities of each photovoltaic cell and each wind turbine respectively, F is the capital recovery coefficient, φ is the discount rate, and L is the service life of the equipment.

8. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 7 is characterized in that: The operating cost of the power system of the entire industrial park is C om Including the operating cost of new energy units C omRE,s 、Operation cost of thermal power unit C G,s , distribution transformer and interconnection line operation and maintenance costs C TL,s , Penalty cost for wind and solar power abandonment C cRE,s 、Operation cost of sufficient electrolytic aluminum load C Al,s 、 Cost of purchasing electricity from external power grid C ex,s , the formula is: In the formula, p s is the probability corresponding to the sth scene, n s is the total number of scenarios, each scenario refers to a typical day.

9. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 8 is characterized in that: New energy unit operating cost C omRE,s for: In the formula, are the grid-connected power of the original photovoltaic power station and wind farm in the park in the sth scenario at time period t, are the grid-connected power of the newly built photovoltaic power station and wind farm in period t, are the operating costs per unit output of photovoltaic and wind turbines respectively; The operating cost of thermal power units C G,s It is composed of the coal consumption cost, start-up and shutdown cost, and carbon emission penalty cost of thermal power units: In the formula, a k , b k 、c k are the operating cost coefficients of the k-th thermal power unit, are the start-up and shutdown costs of the k-th thermal power unit, is the total output of the k-th thermal power unit in period t, is the operating status of the thermal power unit, which is a 0-1 integer variable. It means that the qth unit of the kth type is in the on state during the t period. Indicates that the qth unit of the kth type is in the shutdown state during the t period, n G,k is the number of k-type units, ε is the emission intensity, c tas The carbon tax to be paid per unit of CO2 emissions, Ω G A collection of models of thermal power units.

10. The source-load-storage configuration scheme for the abundant electrolytic aluminum source-grid-load-storage integrated project park according to claim 9 is characterized in that: Distribution transformer and interconnection line operation and maintenance cost C TL,s for: In the formula, is the operating capacity of the distribution transformer in period t, The unit capacity operation and maintenance cost of distribution transformers and interconnection lines; Penalty cost for wind and solar curtailment C cRE,s for: In the formula, is the penalty cost coefficient for unit wind and solar power abandonment, are the predicted power of the original photovoltaic power station and wind farm in period t, is the predicted power of the newly built photovoltaic power station and wind farm in period t; External power grid purchase cost C ex,s for: In the formula, c buy The price of electricity purchased from the power grid for the industrial park, The power purchased for the industrial park.

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