Source network load storage cooperative operation control method and device

Abstract

The invention discloses a source-grid-load-storage cooperative operation control method and device, and belongs to the technical field of source-grid-load-storage cooperative operation control. The method comprises the following specific steps: collecting meteorological data, power grid data, load data and energy storage data; constructing a cooperative operation control model, and taking the minimum value of the operation cost and the operation fluctuation parameter as a target function of the cooperative operation control model; the operation fluctuation parameters comprise overall stability and local stability; solving the objective function through the production constraint function, the power balance constraint function, the photovoltaic operation constraint function and the energy storage constraint function to obtain a cooperative control strategy; and controlling load equipment, energy storage equipment and power grid transaction in the system according to the cooperative control strategy. Meanwhile, the invention discloses a device for executing the method, cooperative control is participated according to the load operation characteristics, the influence of overall fluctuation and local fluctuation caused by intermittent load is considered, and dual-objective optimization of operation cost and stability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of source-grid-load-storage coordinated operation control, and in particular to a source-grid-load-storage coordinated operation control method and device. Background Art

[0002] With increasingly severe environmental issues and concerns about the depletion of traditional fossil fuels, the global energy mix is ​​gradually shifting toward clean energy. Renewable energy sources such as solar and wind power are being connected to the power grid on a large scale. However, their intermittent and volatile nature poses challenges to the stable operation of the grid. For example, photovoltaic power generation can be low or even non-existent on rainy days or at night, and wind power output is also affected by natural conditions such as wind speed. The widespread integration of new elements such as distributed power sources, energy storage, and electric vehicles into the power grid has altered the grid's traditional unidirectional power flow characteristics, making grid operation and control more complex. A search revealed patent publication number CN119675151B, which discloses a robust power system optimization method and apparatus that accounts for meteorological uncertainty. This method derives power optimization strategies from clean energy and load forecasts. Existing technologies typically treat load as an unadjustable variable, ignoring the role of load adjustability in operational control. These methods also focus solely on overall grid stability. However, in actual production processes, the operational characteristics of production equipment can affect grid stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a source-grid-load-storage coordinated operation control method and device to solve the above technical problems.

[0004] To achieve the above objectives, the present invention provides a method for controlling the coordinated operation of a source, grid, load, and storage system, the specific steps of which are as follows:

[0005] Step S1: Collect meteorological data, power grid data, load data and energy storage data;

[0006] Step S2: Constructing a collaborative operation control model, taking the minimum value of the operation cost and the operation fluctuation parameter as the objective function of the collaborative operation control model; the operation fluctuation parameter includes overall stability and local stability;

[0007] Step S3: Solve the objective function through the production constraint function, the power balance constraint function, the photovoltaic operation constraint function and the energy storage constraint function to obtain a coordinated control strategy;

[0008] Step S4: Control the load equipment, energy storage equipment and grid transactions in the system according to the coordinated control strategy.

[0009] Preferably, the load data includes production equipment ledgers and production order quantities, and the load is divided into continuous load, intermittent load, production auxiliary adjustable load, and non-production adjustable load according to the production equipment ledger;

[0010] Meteorological data, including sunshine data, is used to predict photovoltaic power generation.

[0011] Preferably, the objective function of the collaborative operation control model is as follows:

[0012]

[0013] Among them, F is the objective function, min() is the minimum function, α and β are the operating cost weight and operating stability weight respectively, is the photovoltaic operation cost in period T, is the grid operation cost for period T, is the energy storage operation cost in period T, is the revenue from electricity sales in period T; X and x are the overall stability parameter and local stability parameter, respectively; δ and ε are the overall stability weight and local stability weight, respectively.

[0014] Preferably, the calculation formula for photovoltaic operation cost in period T is as follows:

[0015]

[0016] Among them, P t PV is the photovoltaic output power at time t, Δt is the time interval, k is the photovoltaic operation and maintenance cost coefficient, is the annual attenuation coefficient of photovoltaic power generation, g is the proportional coefficient between initial investment and annual power generation;

[0017] The calculation formula for the grid operation cost in period T is as follows:

[0018]

[0019] Among them, P t D is the grid output power at time t, h is the grid operation and maintenance cost coefficient;

[0020] The calculation formula for energy storage operation cost within period T is as follows:

[0021]

[0022] Among them, P t B is the energy storage charging and discharging power at time t, and w is the energy storage operation and maintenance cost coefficient;

[0023] The formula for calculating the revenue from electricity sales within period T is as follows:

[0024]

[0025] Among them, P t d is the power required by the load at time t, et is the grid electricity price at time t, e f and e g They are the peak electricity price and the valley electricity price of the power grid respectively.

[0026] Preferably, the overall stability parameter calculation formula is as follows:

[0027]

[0028] Where μ is the overall stable unit conversion coefficient, P max is the maximum output power of the grid within the period T, and P min is the minimum output power of the grid within the period T. is the average output power of the grid during period T;

[0029] The local stability parameter calculation formula is as follows:

[0030]

[0031] Where ν is the local stability unit conversion coefficient, N is the number of intermittent periods within period T, P max,Δi is the maximum output power of the grid during the Δi-th intermittent period, and P min,Δi is the minimum output power of the grid during the Δi-th intermittent period. is the average output power of the grid during the Δi-th intermittent period.

[0032] Preferably, the production constraint function is as follows:

[0033]

[0034] Among them, P t d，1 、P t d，2 、P t d,3 and P t d,4 are the required powers of continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load at time t, respectively; y is the production order quantity, τ1, τ2, τ3 and τ4 are the continuous load conversion coefficient, intermittent load conversion coefficient, production auxiliary adjustable load conversion coefficient and non-production adjustable load conversion coefficient, respectively; ζ is the redundancy percentage, c is the non-production adjustable load quantity, χ1 and χ2 are the production auxiliary adjustment quantity and non-production adjustment quantity, respectively.

[0035] Preferably, the power balance constraint function is as follows:

[0036] P t d +Ψ B P t B =P tPV +P t D

[0037] Among them, B is the energy storage state coefficient, Ψ B =1, the energy storage state is charging, B =-1, the energy storage state is discharge;

[0038] The photovoltaic operation constraint function is as follows:

[0039] 0≤P t PV ≤P t PV,max

[0040]

[0041] Among them, P t PV,max is the maximum photovoltaic output power; is the photovoltaic conversion efficiency at time t, G(t) is the light intensity at time t, A is the photovoltaic area, and f is the photovoltaic derating factor;

[0042] Preferably, the energy storage constraint function is as follows:

[0043] P t B,min ≤P t B ≤P t B,max

[0044]

[0045] Among them, P t B,min and P t B,max are the minimum power and maximum power of energy storage charging and discharging respectively; and are the energy storage charge states at time t and time t-1 respectively, and are the minimum and maximum values ​​of the energy storage charge state, respectively. is the energy storage charging and discharging power at time t-1, and Δt is the time interval.

[0046] Preferably, the constraint variables are as follows:

[0047] {χ1,χ2,P t D ,Ψ B ,P t B}.

[0048] A device for executing the above-mentioned source-grid-load-storage coordinated operation control method specifically includes the following modules:

[0049] The data acquisition module is used to collect meteorological data, power grid data, load data, and energy storage data, and classify the load data into continuous load, intermittent load, production auxiliary adjustable load, and non-production adjustable load according to the operating characteristics;

[0050] A construction module for constructing a collaborative operation control model with operation cost and operation fluctuation minimum as the objective function;

[0051] The constraint module constructs the production constraint function, power balance constraint function, photovoltaic operation constraint function, and energy storage constraint function, and solves the objective function to obtain the coordinated control strategy;

[0052] The execution control module is used to execute the coordinated control strategy and realize the operation control of the source, grid, load and storage.

[0053] Therefore, the present invention adopts the above-mentioned source-grid-load-storage coordinated operation control method and device, which has the following beneficial effects:

[0054] (1) Participate in collaborative control based on load operation characteristics, divide the load into continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load according to the production equipment ledger, and optimize the production auxiliary adjustment amount and non-production adjustment amount to ensure lower cost operation under the condition of stable operation of the power grid and normal production.

[0055] (2) The impact of overall fluctuations and local fluctuations caused by intermittent loads is taken into account at the same time, achieving dual-objective optimization of operating costs and composite stability.

[0056] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a flow chart of a source-grid-load-storage coordinated operation control method of the present invention. DETAILED DESCRIPTION

[0058] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0060] like Figure 1 As shown, a source-grid-load-storage coordinated operation control method has the following specific steps:

[0061] Step S1: Collect meteorological data, power grid data, load data and energy storage data.

[0062] Meteorological data, including sunshine data, is used to predict photovoltaic power generation. Real-time temperature data can also be collected to correct for the impact of temperature on photovoltaic power generation. Cloud cover data can also be collected to correct sunlight data.

[0063] Load data includes production equipment ledger and production order quantity. According to the production equipment ledger, the load is divided into continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load.

[0064] Continuous load: This load is generated by equipment that requires continuous operation and has a low start-stop frequency. This is typically core production equipment. Examples include blast furnaces in the metallurgical industry, reactors in the chemical industry, and transmission equipment in continuous production lines. These equipment should be clearly marked as "continuous operation" or "24-hour operation" in the production equipment records.

[0065] Intermittent load: Equipment load that starts and stops periodically during the production process, with operating time directly related to the production process. Examples include machine tools, injection molding machines, and packaging equipment. Production equipment records should record "process linkage" or "intermittent operation."

[0066] Production auxiliary adjustable loads: These loads provide auxiliary support for core production equipment and can be adjusted based on demand, offering a certain degree of flexibility. Examples include ventilation systems, cooling water pumps, and lighting equipment. These loads are recorded as "adjustable power" or "on-demand start / stop" in the production equipment ledger.

[0067] Non-production adjustable loads: Loads that are not directly related to the production process and can be flexibly adjusted, mainly for office and living facilities. Examples include air conditioners, water dispensers, and lighting fixtures.

[0068] The load data and energy storage data include their respective operating parameters and fixed parameters, which are conventionally collected data in the prior art and are not listed here.

[0069] Step S2: Construct a collaborative operation control model, with the minimum value of the operation cost and the operation fluctuation parameter as the objective function of the collaborative operation control model; the operation fluctuation parameter includes overall stability and local stability.

[0070] The objective function of the collaborative operation control model is as follows:

[0071]

[0072] Among them, F is the objective function, min() is the minimum function, α and β are the operating cost weight and operating stability weight respectively, is the photovoltaic operation cost in period T, is the grid operation cost for period T, is the energy storage operation cost in period T, is the revenue from electricity sales in period T; X and x are the overall stability parameter and local stability parameter, respectively; δ and ε are the overall stability weight and local stability weight, respectively.

[0073] The calculation formula for photovoltaic operation cost in period T is as follows:

[0074]

[0075] Among them, P t PV is the photovoltaic output power at time t, Δt is the time interval, k is the photovoltaic operation and maintenance cost coefficient, is the annual attenuation coefficient of photovoltaic power generation, g is the proportional coefficient between initial investment and annual power generation;

[0076] The calculation formula for the grid operation cost in period T is as follows:

[0077]

[0078] Among them, P t D is the grid output power at time t, h is the grid operation and maintenance cost coefficient;

[0079] The calculation formula for energy storage operation cost within period T is as follows:

[0080]

[0081] Among them, P t B is the energy storage charging and discharging power at time t, and w is the energy storage operation and maintenance cost coefficient;

[0082] The formula for calculating the revenue from electricity sales within period T is as follows:

[0083]

[0084] Among them, P t d is the power required by the load at time t, e t is the grid electricity price at time t, e f and e g They are the peak electricity price and the valley electricity price of the power grid respectively.

[0085] The overall stability parameter reflects the stability within the cycle. The calculation formula of the overall stability parameter is as follows:

[0086]

[0087] Where μ is the overall stable unit conversion coefficient, P max is the maximum output power of the grid within the period T, and P min is the minimum output power of the grid within the period T. is the average output power of the grid during period T.

[0088] Local stability is affected by intermittent loads and fluctuates when intermittent loads are started. The intermittent period can be set to match the intermittent load. The local stability parameter calculation formula is as follows:

[0089]

[0090] Where ν is the local stability unit conversion coefficient, N is the number of intermittent periods within period T, P max,Δi is the maximum output power of the grid during the Δi-th intermittent period, and P min,Δi is the minimum output power of the grid during the Δi-th intermittent period. is the average output power of the grid during the Δi-th intermittent period.

[0091] Step S3: Solve the objective function through the production constraint function, power balance constraint function, photovoltaic operation constraint function and energy storage constraint function to obtain a coordinated control strategy.

[0092] The production constraint function is as follows:

[0093] P t d =Pt d，1 +P t d，2 +P t d，3 +P t d，4

[0094] P t d，1 =y·τ1·(1+ζ)

[0095] P t d,2 =y·τ2·(1+ζ)

[0096] P t d,3 =y·τ3·(1+ζ)·χ1

[0097] P t d,4 =c·τ4·(1+ζ)·χ2

[0098] Among them, P t d，1 、P t d，2 、P t d,3 and P t d,4 are the required powers of continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load at time t; y is the production order quantity, τ1, τ2, τ3 and τ4 are the continuous load conversion coefficient, intermittent load conversion coefficient, production auxiliary adjustable load conversion coefficient and non-production adjustable load conversion coefficient, respectively, which are set according to their respective load attributes, ζ is the redundancy percentage, c is the non-production adjustable load, χ1 and χ2 are the production auxiliary adjustment amount and non-production adjustment amount, respectively.

[0099] The power balance constraint function is as follows:

[0100] P t d +Ψ B P t B =P t PV +P t D

[0101] Among them, B is the energy storage state coefficient, Ψ B =1, the energy storage state is charging, Ψ B =-1, the energy storage state is discharge.

[0102] The photovoltaic operation constraint function is as follows:

[0103] 0≤P t PV ≤P t PV,max

[0104]

[0105] Among them, P t PV,max is the maximum photovoltaic output power; is the photovoltaic conversion efficiency at time t, G(t) is the light intensity at time t, A is the photovoltaic area, and f is the photovoltaic derating factor (affected by temperature, dust, etc.).

[0106] The energy storage constraint function is as follows:

[0107] P t B,min ≤P t B ≤P t B,max

[0108]

[0109] Among them, P t B,min and P t B,max are the minimum power and maximum power of energy storage charging and discharging respectively; and are the energy storage charge states at time t and time t-1 respectively, and are the minimum and maximum values ​​of the energy storage charge state, respectively. is the energy storage charging and discharging power at time t-1, and Δt is the time interval.

[0110] The constraint variables are as follows:

[0111] {χ1,χ2,P t D ,Ψ B ,P t B}.

[0112] Step S4: Control the load equipment, energy storage equipment and grid transactions in the system according to the coordinated control strategy.

[0113] A device for executing the above-mentioned source-grid-load-storage coordinated operation control method specifically includes the following modules:

[0114] The data acquisition module is used to collect meteorological data, power grid data, load data and energy storage data, and divide the load data into continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load according to the operating characteristics.

[0115] The construction module is used to construct a collaborative operation control model with the operation cost and the minimum operation fluctuation as the objective function.

[0116] The constraint module constructs the production constraint function, power balance constraint function, photovoltaic operation constraint function and energy storage constraint function, and solves the objective function to obtain the coordinated control strategy.

[0117] The execution control module is used to execute the coordinated control strategy and realize the operation control of the source, grid, load and storage.

[0118] In order to verify the effectiveness of this embodiment, a simulation test was conducted, and the simulation equipment and meteorological data are shown in Table 1.

[0119] Table 1 Simulation equipment and meteorological data

[0120]

[0121]

[0122] Photovoltaic and load matching scenario (12:00-14:00):

[0123] Photovoltaic output 800kW, continuous load 350kW, intermittent load 110kW, production auxiliary load 100kW, non-production load 40kW

[0124] Surplus power = 800 - (350 + 110 + 100 + 40) = 200 kW → Energy storage charging 200 kW, or selling 200 kW of electricity to the grid;

[0125] Peak load scenario (18:00-20:00):

[0126] PV output 0kW, continuous load 350kW, intermittent load 110kW, production auxiliary load 150kW, non-production load 60kW, total load = 350+110+150+60=670kW, energy storage discharge 150kW, grid power purchase 520kW → trigger objective function optimization, adjust production auxiliary load (such as reducing cooling water pump power to 80kW) and non-production load (turn off air conditioning), and reduce grid power purchase to 450kW.

[0127] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A source-grid-load-storage coordinated operation control method, characterized in that: The specific steps are as follows: Step S1: Collect meteorological data, power grid data, load data and energy storage data; Step S2: Constructing a collaborative operation control model, taking the minimum value of the operation cost and the operation fluctuation parameter as the objective function of the collaborative operation control model; the operation fluctuation parameter includes overall stability and local stability; Step S3: Solve the objective function through the production constraint function, the power balance constraint function, the photovoltaic operation constraint function and the energy storage constraint function to obtain a coordinated control strategy; Step S4: Control the load equipment, energy storage equipment and grid transactions in the system according to the coordinated control strategy.

2. The source-grid-load-storage coordinated operation control method according to claim 1, characterized in that: Load data includes production equipment records and production order quantities. Based on the production equipment records, loads are divided into continuous loads, intermittent loads, production auxiliary adjustable loads, and non-production adjustable loads. Meteorological data, including sunshine data, is used to predict photovoltaic power generation.

3. The source-grid-load-storage coordinated operation control method according to claim 2, characterized in that: The objective function of the collaborative operation control model is as follows: Among them, F is the objective function, min() is the minimum function, α and β are the operating cost weight and operating stability weight respectively, is the photovoltaic operation cost in period T, is the grid operation cost for period T, is the energy storage operation cost in period T, is the revenue from electricity sales in period T; X and x are the overall stability parameter and local stability parameter, respectively; δ and ε are the overall stability weight and local stability weight, respectively.

4. The source-grid-load-storage coordinated operation control method according to claim 3, characterized in that: The calculation formula for photovoltaic operation cost in period T is as follows: Among them, P t PV is the photovoltaic output power at time t, Δt is the time interval, k is the photovoltaic operation and maintenance cost coefficient, is the annual attenuation coefficient of photovoltaic power generation, g is the proportional coefficient between initial investment and annual power generation; The calculation formula for the grid operation cost in period T is as follows: Among them, P t D is the grid output power at time t, h is the grid operation and maintenance cost coefficient; The calculation formula for energy storage operation cost within period T is as follows: Among them, P t B is the energy storage charging and discharging power at time t, and w is the energy storage operation and maintenance cost coefficient; The formula for calculating the revenue from electricity sales within period T is as follows: Among them, P t d is the power required by the load at time t, e t is the grid electricity price at time t, e f and e g They are the peak electricity price and the valley electricity price of the power grid respectively.

5. The source-grid-load-storage coordinated operation control method according to claim 4, characterized in that: The overall stability parameter calculation formula is as follows: Where μ is the overall stable unit conversion coefficient, Pmax is the maximum output power of the grid within the period T, and Pmin is the minimum output power of the grid within the period T. is the average output power of the grid during period T; The local stability parameter calculation formula is as follows: Where ν is the local stable unit conversion coefficient, N is the number of intermittent periods within period T, Pmax,Δi is the maximum output power of the grid during the Δi-th intermittent period, and Pmin,Δi is the minimum output power of the grid during the Δi-th intermittent period. is the average output power of the grid during the Δi-th intermittent period.

6. The source-grid-load-storage coordinated operation control method according to claim 5, characterized in that: The production constraint function is as follows: P t d =P t d，1 +P t d，2 +P t d，3 +P t d，4 P t d，1 =y·τ1·(1+ζ) P t d,2 =y·τ2·(1+ζ) P t d,3 =y·τ3·(1+ζ)·χ1 P t d,4 =c·τ4·(1+ζ)·χ2 Among them, P t d，1 、P t d，2 、P t d,3 and P t d,4 are the required powers of continuous load, intermittent load, production auxiliary adjustable load and non-production adjustable load at time t, respectively; y is the production order quantity, τ1, τ2, τ3 and τ4 are the continuous load conversion coefficient, intermittent load conversion coefficient, production auxiliary adjustable load conversion coefficient and non-production adjustable load conversion coefficient, respectively; ζ is the redundancy percentage, c is the non-production adjustable load quantity, χ1 and χ2 are the production auxiliary adjustment quantity and non-production adjustment quantity, respectively.

7. The source-grid-load-storage coordinated operation control method according to claim 6, characterized in that: The power balance constraint function is as follows: P t d +Ψ B P t B =P t PV +P t D Among them, B is the energy storage state coefficient, Ψ B =1, the energy storage state is charging, Ψ B =-1, the energy storage state is discharge; The photovoltaic operation constraint function is as follows: 0≤P t PV ≤P t PV,max Among them, P t PV,max is the maximum photovoltaic output power; is the photovoltaic conversion efficiency at time t, G(t) is the light intensity at time t, A is the photovoltaic area, and f is the photovoltaic derating factor.

8. The source-grid-load-storage coordinated operation control method according to claim 7, characterized in that: The energy storage constraint function is as follows: P t B,min ≤P t B ≤P t B,max Among them, P t B,min and P t B,max are the minimum power and maximum power of energy storage charging and discharging respectively; and are the energy storage charge states at time t and time t-1 respectively, and are the minimum and maximum values ​​of the energy storage charge state, respectively. is the energy storage charging and discharging power at time t-1, and Δt is the time interval.

9. The source-grid-load-storage coordinated operation control method according to claim 8, characterized in that: The constraint variables are as follows:

10. A device for executing the source-grid-load-storage coordinated operation control method according to claim 9, characterized in that: Specifically, it includes the following modules: The data acquisition module is used to collect meteorological data, power grid data, load data, and energy storage data, and classify the load data into continuous load, intermittent load, production auxiliary adjustable load, and non-production adjustable load according to the operating characteristics; A construction module for constructing a collaborative operation control model with operation cost and operation fluctuation minimum as the objective function; The constraint module constructs the production constraint function, power balance constraint function, photovoltaic operation constraint function, and energy storage constraint function, and solves the objective function to obtain the coordinated control strategy; The execution control module is used to execute the coordinated control strategy and realize the operation control of the source, grid, load and storage.

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