A new energy real-time consumption capacity calculation method and system

Abstract

The application provides a new energy real-time consumption capacity calculation method, which comprises the following steps: obtaining power system operation data; bringing the power system operation data into a pre-constructed sending end area new energy real-time consumption model, a receiving end area new energy real-time consumption model and a UHV DC system new energy real-time transmission model respectively to obtain a sending end area new energy real-time consumption capacity, a receiving end area new energy real-time consumption capacity and a UHV DC system new energy real-time transmission capacity; bringing the sending end area new energy real-time consumption capacity, the receiving end area new energy real-time consumption capacity and the UHV DC system new energy real-time transmission capacity into a pre-constructed calculation model to obtain a new energy real-time consumption capacity; and coordinating the sending end area, the receiving end area and the DC system to quickly solve the two-area new energy real-time consumption capacity considering the UHV DC system, so as to provide a data reference for a dispatching institution to optimize a cross-area system power generation and transmission plan and promote the consumption of the two-area surplus new energy power generation.

Description

Technical Field

[0001] The present invention belongs to the fields of sending-end regional power systems, receiving-end regional power systems and ultra-high voltage direct current systems, and relates to a method and system for calculating the real-time absorption capacity of new energy. Background Art

[0002] With the large-scale development of renewable energy in China, some regions are no longer able to fully absorb renewable energy generation solely through local load demand. Using UHV DC lines for cross-regional transmission and absorption is currently a key solution. UHV DC lines connect the power systems of the sending and receiving regions to form a cross-regional system. By coordinating the generation and transmission plans of thermal power units, renewable energy stations, and UHV DC lines in the two regions, they facilitate the transmission and absorption of surplus renewable energy generation in the cross-regional system. Currently, research focuses on optimizing cross-regional system generation and transmission plans on a real-time basis, facilitating the absorption of surplus renewable energy generation in both regions, and rapidly determining the real-time absorption capacity of renewable energy in both regions, taking into account the UHV DC system, to provide data reference for dispatching agencies. Summary of the Invention

[0003] To address the problem that existing regions cannot fully absorb renewable energy generation solely through local load demand, the present invention provides a method and system for calculating the real-time renewable energy absorption capacity. This method coordinates the operation of the transmitting and receiving regions and the DC system to rapidly calculate the real-time renewable energy absorption capacity of the two regions, including the UHVDC system. This method also provides a data reference for dispatching agencies to optimize cross-regional system power generation and transmission plans and promote the absorption of surplus renewable energy generation in the two regions. The specific solution is as follows:

[0004] Obtain power system operation data;

[0005] The power system operation data is respectively introduced into a pre-built real-time new energy consumption model for the sending-end region, a real-time new energy consumption model for the receiving-end region, and a real-time new energy transmission model for the ultra-high voltage direct current system to obtain the real-time new energy consumption capacity for the sending-end region, the real-time new energy consumption capacity for the receiving-end region, and the real-time new energy transmission capacity for the ultra-high voltage direct current system;

[0006] The real-time new energy absorption capacity of the sending-end area, the real-time new energy absorption capacity of the receiving-end area and the real-time new energy transmission capacity of the UHVDC system are brought into a pre-built calculation model to obtain the real-time new energy absorption capacity.

[0007] Preferably, the power system operation data includes: the current dispatching plan of the sending end area, the operating parameters of the thermal power units in the receiving end area, the load demand curve, the power generation plan of the thermal power units, the UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system and the power generation plan of the thermal power units.

[0008] Preferably, the power system operation data is brought into a pre-built real-time new energy consumption model for the sending-end region to obtain the real-time new energy consumption capacity of the sending-end region, including:

[0009] The current sending-end regional dispatch plan, load demand curve and thermal power generation plan are input into the pre-built sending-end regional new energy real-time absorption model to obtain the sending-end regional new energy real-time absorption capacity.

[0010] Preferably, the real-time consumption model of new energy in the sending-end area includes:

[0011] The operating status of the thermal power units in the sending-end area, the generated power of the thermal power units, and the transmission power of the UHVDC lines are used as decision variables of the real-time consumption model of new energy in the sending-end area;

[0012] Taking the maximum consumption of new energy in the sending-end region and the minimum consumption of new energy in the sending-end region as the optimization objectives of the real-time consumption model of new energy in the sending-end region;

[0013] The constraints of the real-time consumption model of new energy in the sending-end area are the power balance constraints of the power system in the sending-end area, the reserve constraints of the power system in the sending-end area, the operation constraints of the thermal power units in the power system in the sending-end area, the initial operation constraints of the thermal power units in the power system in the sending-end area and the transmission constraints of the UHVDC system.

[0014] Preferably, the power system operation data is brought into a pre-built real-time new energy consumption model of the receiving area to obtain the real-time new energy consumption capacity of the receiving area, including:

[0015] The operating parameters, load demand curve and power generation plan of the thermal power units in the receiving area are input into the real-time new energy consumption model of the receiving area to obtain the real-time new energy consumption capacity of the receiving area.

[0016] Preferably, the real-time consumption model of new energy in the receiving area includes:

[0017] The operating status of the thermal power units in the receiving area, the generated power of the thermal power units and the transmission power of the UHVDC line are used as decision variables of the real-time consumption model of new energy in the receiving area;

[0018] Taking the maximum consumption of new energy in the receiving area and the minimum consumption of new energy in the receiving area as the optimization objectives of the real-time consumption model of new energy in the receiving area;

[0019] The constraints of the real-time consumption model of new energy in the receiving area are the power balance constraints of the power system in the receiving area, the reserve constraints of the power system in the receiving area, the operation constraints of the thermal power units in the power system in the receiving area, the initial operation constraints of the thermal power units in the power system in the receiving area and the transmission constraints of the ultra-high voltage direct current system.

[0020] Preferably, the power system operation data is brought into a pre-built UHVDC system new energy real-time absorption model to obtain the UHVDC system new energy real-time absorption capacity, including:

[0021] The UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system, and the power generation plan of the thermal power units are input into the UHVDC system new energy real-time transmission model to obtain the UHVDC system new energy real-time transmission capacity.

[0022] Preferably, the UHVDC system new energy real-time transmission model includes:

[0023] The operating status of the thermal power units in the UHVDC system, the generated power of the thermal power units, and the transmission power of the UHVDC line are used as decision variables of the real-time transmission model of new energy in the UHVDC system;

[0024] The optimization objectives of the real-time transmission model of new energy in the UHVDC system are to maximize the real-time transmission power of new energy in the UHVDC system and to minimize the real-time transmission power of new energy in the UHVDC system;

[0025] The constraints of the UHVDC fixed transmission constraint, the operation constraint of the thermal power units in the UHVDC system, and the initial operation constraint of the thermal power units in the UHVDC system are used as the constraint conditions of the UHVDC system new energy real-time transmission model.

[0026] Preferably, the optimization objectives of the UHVDC system new energy real-time transmission model and the UHVDC fixed transmission constraints include:

[0027] The specific formula for optimizing the maximum real-time transmission power of renewable energy in the UHVDC system and the minimum real-time transmission power of renewable energy in the UHVDC system is as follows:

[0028]

[0029]

[0030] Where, T is the length of model simulation time; Pnl t is the transmission power of renewable energy in the UHVDC system during period t;

[0031] The specific formula for the UHVDC fixed transmission constraint is as follows:

[0032]

[0033]

[0034] Where, Fl is the number of thermal power units in the UHVDC system; is the operating status of thermal power unit fl in the UHVDC system at time t; is the power generation power of thermal power unit fl in the UHVDC system at time t; Pl t ,pl t are the transmission power and planned transmission power of the UHVDC system at time t, respectively; They are respectively the downward and upward safety adjustment margins of the UHVDC system at time t based on the transmission plan.

[0035] Preferably, the calculation model includes:

[0036] The power generation of renewable energy in the sending-end region and the power generation of renewable energy in the receiving-end region are used as decision variables of the calculation model;

[0037] When the new energy power generation power in the sending-end region is used as the decision variable of the calculation model, the maximum and minimum values ​​of the new energy power generation power in the sending-end region are used as the optimization targets of the calculation model; when the new energy power generation power in the receiving-end region is used as the decision variable of the calculation model, the maximum and minimum values ​​of the new energy power generation power in the receiving-end region are used as the optimization targets of the calculation model;

[0038] The constraints of the calculation model are the balance constraint of new energy consumption capacity, the real-time consumption interval constraint of new energy in the sending-end area, the real-time consumption interval constraint of new energy in the receiving-end area, and the real-time transmission capacity interval constraint of new energy in the UHVDC system.

[0039] Preferably, the optimization objectives and constraints of the calculation model include:

[0040] The specific formula for optimizing the maximum and minimum values ​​of the new energy power generation in the sending-end region and the maximum and minimum values ​​of the new energy power generation in the receiving-end region is as follows:

[0041]

[0042]

[0043]

[0044]

[0045] Where, T is the length of model simulation time; Pns′ t , Pnr′ t are the renewable energy power generation in the transmitting and receiving areas of the UHVDC system during period t;

[0046] The specific formula for the balance constraint of new energy consumption capacity is as follows:

[0047] Pns t=Pns t +Pnl t

[0048] Pnr t =Pnr t -dPl t

[0049] dPl t =Pl t -pl t

[0050] Where, dPl t is the adjustment amount of the UHVDC system based on the transmission plan at time t;

[0051] The specific formula for the real-time consumption interval constraint of new energy in the sending-end area is as follows:

[0052]

[0053] Where, They are the real-time maximum and minimum absorption capacity of new energy in the sending-end area respectively;

[0054] The specific formula for the real-time consumption interval constraint of new energy in the receiving area is as follows:

[0055] Pnr t max ≥Pnr t ≥Pnr t min

[0056] Where Pnr t max , Pn t min They are the real-time maximum and minimum absorption capacity of new energy in the sending-end area respectively;

[0057] The specific formula for the interval constraint of the real-time transmission capacity of new energy in the UHVDC system is as follows:

[0058]

[0059] Where, They are respectively the real-time maximum and minimum transmission capacities of new energy in the UHVDC system.

[0060] Based on the same concept, the present invention provides a new energy real-time absorption capacity calculation system, including: an acquisition module, a regional absorption module and an absorption capacity module;

[0061] The acquisition module is used to acquire power system operation data;

[0062] The regional absorption module is used to bring the power system operation data into the pre-built real-time absorption model of new energy in the sending-end region, the real-time absorption model of new energy in the receiving-end region, and the real-time transmission model of new energy in the ultra-high voltage direct current system, respectively, to obtain the real-time absorption capacity of new energy in the sending-end region, the real-time absorption capacity of new energy in the receiving-end region, and the real-time transmission capacity of new energy in the ultra-high voltage direct current system;

[0063] The absorption capacity module is used to bring the real-time absorption capacity of new energy in the sending-end area, the real-time absorption capacity of new energy in the receiving-end area and the real-time transmission capacity of new energy in the ultra-high voltage direct current system into a pre-built calculation model to obtain the real-time absorption capacity of new energy.

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

[0065] 1. A method for calculating the real-time absorption capacity of new energy sources includes: obtaining power system operating data; respectively inputting the power system operating data into a pre-built real-time absorption model for new energy sources in the sending region, a pre-built real-time absorption model for new energy sources in the receiving region, and a pre-built real-time absorption model for new energy sources in the ultra-high voltage direct current (UHVDC) system to obtain the real-time absorption capacity of new energy sources in the sending region, the real-time absorption capacity of new energy sources in the receiving region, and the real-time absorption capacity of new energy sources in the ultra-high voltage direct current (UHVDC) system; and inputting the real-time absorption capacity of new energy sources in the sending region, the real-time absorption capacity of new energy sources in the receiving region, and the real-time absorption capacity of new energy sources in the ultra-high voltage direct current (UHVDC) system into the pre-built calculation model to obtain the real-time absorption capacity of new energy sources. The present invention coordinates the operation of the sending and receiving regions with the DC system to rapidly calculate the real-time absorption capacity of new energy sources in the two regions, taking into account the ultra-high voltage direct current system.

[0066] 2. The present invention provides a method and system for calculating the real-time absorption capacity of new energy, which provides a data reference for dispatching agencies to optimize cross-regional system power generation and transmission plans and promote the absorption of surplus new energy power generation in two regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A flow chart of the method provided by the present invention;

[0068] Figure 2 A cross-region system diagram provided for an embodiment of the present invention;

[0069] Figure 3 A diagram showing the calculation process of the real-time absorption capacity of new energy provided by an embodiment of the present invention;

[0070] Figure 4 This is a system structure diagram provided by the present invention. DETAILED DESCRIPTION

[0071] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0072] Example 1:

[0073] The present invention provides a method for calculating the real-time absorption capacity of new energy. Figure 1 The method provided by the present invention is introduced in the flowchart, and the specific steps are as follows:

[0074] Step 1: Obtain power system operation data;

[0075] Step 2: The power system operation data is respectively introduced into the pre-built real-time new energy consumption model of the sending-end region, the real-time new energy consumption model of the receiving-end region, and the real-time new energy transmission model of the UHVDC system to obtain the real-time new energy consumption capacity of the sending-end region, the real-time new energy consumption capacity of the receiving-end region, and the real-time new energy transmission capacity of the UHVDC system;

[0076] Step 3: The real-time new energy absorption capacity of the sending-end region, the real-time new energy absorption capacity of the receiving-end region, and the real-time new energy transmission capacity of the UHVDC system are input into a pre-built calculation model to obtain the real-time new energy absorption capacity;

[0077] Among them, step 1: obtain power system operation data:

[0078] The present invention relates to a fast calculation strategy for the real-time absorption capacity of new energy, specifically to a phenomenon that a cross-regional system is composed of a sending-end regional power system, a receiving-end regional power system, and a UHVDC system (such as the attached Figure 2 As shown in the figure), a real-time new energy consumption model for the sending-end region, a new energy consumption model for the receiving-end region and a real-time new energy transmission model for the UHVDC system are established to solve the real-time new energy consumption capacity of the sending-end region, the real-time new energy consumption capacity of the receiving-end region and the real-time new energy transmission capacity of the UHVDC system. On this basis, a calculation model for the real-time new energy consumption capacity based on the sending-end and receiving-end regions and the DC system is constructed to quickly solve the real-time new energy consumption capacity of the two regions taking into account the UHVDC system, providing data reference for the dispatching agency to optimize the cross-regional system power transmission plan and promote the consumption of surplus new energy power generation in the two regions. The specific calculation process of the real-time new energy consumption capacity of the two regions taking into account the UHVDC system is shown in the attached figure. Figure 3 shown.

[0079] Step 2: The power system operation data is respectively introduced into the pre-built real-time new energy consumption model of the sending-end region, the real-time new energy consumption model of the receiving-end region, and the real-time new energy transmission model of the UHVDC system to obtain the real-time new energy consumption capacity of the sending-end region, the real-time new energy consumption capacity of the receiving-end region, and the real-time new energy transmission capacity of the UHVDC system:

[0080] Among them, the cross-regional system refers to the UHVDC system and the regional power grids at both ends of the system, which mainly includes thermal power units and new energy equivalent units in the sending and receiving areas, as well as the supporting thermal power units of the UHVDC system, as shown in the attached figure. Figure 2 shown.

[0081] The real-time absorption model for new energy in the sending-end region uses the operating status of thermal power units in the sending-end region, the generated power of thermal power units, and the transmission power of UHVDC lines as decision variables. Combined with the current dispatch plan in the sending-end region, the initial operation constraints of thermal power units and the transmission constraints of UHVDC lines are added to the model. The maximum and minimum absorption of new energy in the sending-end region are respectively taken as the optimization objectives. Under the conditions of satisfying system operation constraints, thermal power unit operation constraints, and grid security constraints, the real-time absorption capacity of new energy in the sending-end region is calculated using mixed integer programming or commercial software.

[0082] The real-time new energy consumption model for the receiving area uses the operating status of the thermal power units in the receiving area, the generated power of the thermal power units, and the transmission power of the UHVDC lines as decision variables. Combined with the current dispatch plan of the receiving area, the initial operating constraints of the thermal power units and the transmission constraints of the UHVDC lines are added to the model. The maximum and minimum new energy consumption in the receiving area are respectively taken as the optimization objectives. Under the conditions of meeting the system operation constraints, the operation constraints of the thermal power units, and the safety constraints of the power grid, the mixed integer programming method or commercial software is used to calculate the real-time new energy consumption capacity of the receiving area.

[0083] The real-time transmission model for renewable energy in UHVDC systems uses the operating status of thermal power units in the UHVDC system, the generated power of thermal power units, and the transmission power of UHVDC lines as decision variables. Combined with the current UHVDC line transmission plan, initial operating constraints for thermal power units and transmission constraints for UHVDC lines are added to the model. The maximum and minimum transmission power of renewable energy in the UHVDC lines are used as optimization objectives, respectively. Under the conditions of satisfying the operating constraints for thermal power units and the fixed transmission constraints for UHVDC, the real-time transmission capacity of renewable energy in the UHVDC system is calculated using mixed integer programming or commercial software.

[0084] Step 3: The real-time new energy absorption capacity of the sending-end region, the real-time new energy absorption capacity of the receiving-end region, and the real-time new energy transmission capacity of the UHVDC system are brought into the pre-built calculation model to obtain the real-time new energy absorption capacity:

[0085] The calculation model for the real-time absorption capacity of new energy based on the sending and receiving end areas and the DC system takes the new energy power generation power of the sending end area and the new energy power generation power of the receiving end area as decision variables. Combined with the real-time absorption capacity of new energy in the sending and receiving end areas, as well as the new energy transmission capacity of the UHVDC system, the model adds the real-time absorption interval constraints of new energy in the sending end area, the real-time absorption interval constraints of new energy in the receiving end area, and the new energy transmission capacity interval constraints of the UHVDC system. The optimization objectives are the maximum and minimum power generation power of new energy in the sending end area and the maximum and minimum power generation power of new energy in the receiving end area, respectively. Under the conditions of meeting the system operation constraints and other conditions, the real-time absorption capacity of new energy in the two areas of the UHVDC system is solved by using the mixed integer programming method or commercial software.

[0086] Example 2:

[0087] The present invention designs a strategy for quickly calculating the real-time absorption capacity of new energy, which specifically includes the following key steps:

[0088] Step 1: Build a real-time renewable energy absorption model for the sending-end region based on the operating parameters of the thermal power units in the sending-end region, the load demand curve, the generation plan of the thermal power units, and the UHVDC transmission plan. Use mixed integer programming or commercial software to solve the model, and calculate the real-time maximum and minimum absorption curves for renewable energy in the sending-end region to obtain the real-time renewable energy absorption capacity in the sending-end region.

[0089] Among them, the real-time consumption model of new energy in the sending-end area takes the operating status of the thermal power units in the sending-end area, the generated power of the thermal power units, and the transmission power of the UHV DC lines as decision variables, and takes the maximum and minimum consumption of new energy in the sending-end area as optimization goals respectively. Under the conditions of meeting the system operation constraints, thermal power unit operation constraints, thermal power unit operation initial constraints, and UHV DC line transmission constraints, the operation of the power system in the sending-end area is simulated in time series to calculate the real-time consumption capacity of new energy in the sending-end area.

[0090] The specific objectives and constraints of the model are as follows:

[0091] (1) Objective function

[0092] In order to calculate the real-time absorption capacity of new energy in the sending-end area, the maximum and minimum real-time absorption capacity of new energy in the sending-end area are taken as optimization targets respectively. The specific formula is as follows:

[0093]

[0094]

[0095] Where, T is the length of model simulation time; Pns t is the power generation of renewable energy in the sending area during period t.

[0096] (2) Constraints

[0097] Considering the actual operation of the sending-end area, the model must meet the following conditions: system operation constraints, thermal power unit operation constraints, thermal power unit initial operation constraints, and UHVDC system transmission constraints. The specific conditions are as follows:

[0098] (1) Power balance constraints of the power system in the sending area

[0099]

[0100] Where Fs is the number of thermal power units in the sending end area; is the operating status of the thermal power unit fs in the sending end area at time t; Pds is the power generation of the thermal power unit fs in the sending end area at time t; t is the power generation demand of the sending area at time t; Pl t is the transmission power of the UHVDC system at time t.

[0101] (2) Power system reserve constraints in the sending area

[0102]

[0103] Where, are the upward and downward climbing powers of the thermal power unit fs in the sending end area respectively; are the maximum and minimum power generation of thermal power units fs in the sending end area; Rus t , Rds t They are the upward and downward spare demands in the sending area respectively.

[0104] (3) Operational constraints of thermal power units in the power system at the sending end

[0105]

[0106]

[0107] (4) Initial operating constraints of thermal power units in the power system at the sending end

[0108]

[0109] Where, are the unit generating power and actual generating power of the thermal power unit fi in the sending end area at the current moment, respectively.

[0110] (5) UHVDC system transmission constraints

[0111]

[0112] Where, Pl t,pl t are the transmission power and planned transmission power of the UHVDC system at time t, respectively; They are respectively the downward and upward safety adjustment margins of the UHVDC system at time t based on the transmission plan.

[0113] Step 2: Build a real-time renewable energy absorption model for the receiving region based on the operating parameters of the thermal power units in the receiving region, load demand curves, generation plans of the thermal power units, and UHVDC system transmission plans. Use mixed integer programming or commercial software to solve the model, and calculate the maximum and minimum real-time absorption curves for renewable energy in the receiving region to determine the real-time absorption capacity of renewable energy in the receiving region.

[0114] Among them, the real-time absorption model of new energy in the receiving area takes the operating status of the thermal power units in the receiving area, the generated power of the thermal power units, and the transmission power of the UHV DC line as decision variables, and takes the maximum and minimum absorption of new energy in the receiving area as optimization goals respectively. Under the conditions of meeting the system operation constraints, the operation constraints of the thermal power units, the initial operation constraints of the thermal power units, the transmission constraints of the UHV DC line, etc., the time series simulation of the operation of the power system in the receiving area is carried out to calculate the real-time absorption capacity of new energy in the receiving area.

[0115] The specific objectives and constraints of the model are as follows:

[0116] (1) Objective function

[0117] In order to calculate the real-time absorption capacity of new energy in the receiving area, the maximum and minimum absorption capacity of new energy in the receiving area are taken as optimization targets respectively. The specific formula is as follows:

[0118]

[0119]

[0120] Where T is the length of model simulation time; Pnr t is the power generation of renewable energy in the receiving area during period t.

[0121] (2) Constraints

[0122] Considering the actual operating conditions in the receiving area, the model must meet system operation constraints, thermal power unit operation constraints, thermal power unit initial operation constraints, and UHVDC system transmission constraints. The specific conditions are as follows:

[0123] (1) Power balance constraints of the receiving area power system

[0124]

[0125] Where, Fr is the number of thermal power units in the receiving area; is the operating status of the thermal power unit fr in the receiving area at time t; Pdr is the power generation of the thermal power unit fr in the receiving area at time t; t is the power generation demand of the receiving area at time t; Pl t is the transmission power of the UHVDC system at time t.

[0126] (2) Reserve constraints of the receiving area power system

[0127]

[0128] Where, are the upward and downward climbing powers of the thermal power unit fr in the receiving end area respectively; are the maximum and minimum power generation of the thermal power unit fr in the receiving area; Rur t , Rdr t They are the upward and downward backup requirements of the receiving area respectively.

[0129] (3) Operation constraints of thermal power units in the receiving area power system

[0130]

[0131]

[0132] (4) Initial operating constraints of thermal power units in the receiving area power system

[0133]

[0134] Where, are the unit generating power and actual generating power of the thermal power unit fr in the receiving area at the current moment, respectively.

[0135] (5) UHVDC system transmission constraints

[0136]

[0137] Where, Pl t ,pl t are the transmission power and planned transmission power of the UHVDC system at time t, respectively; They are respectively the downward and upward safety adjustment margins of the UHVDC system at time t based on the transmission plan.

[0138] Step 3: Combine the operating parameters of thermal power units in the UHVDC system, the generation plan of thermal power units, the transmission plan of the UHVDC system, and other data to establish a real-time transmission model for renewable energy in the UHVDC system. Use mixed integer programming or commercial software to solve the model, and calculate the maximum and minimum curves of the real-time transmission power of renewable energy in the UHVDC system to obtain the real-time transmission capacity of renewable energy in the UHVDC system.

[0139] Among them, the real-time transmission model of new energy in the UHVDC system uses the operating status of the thermal power units in the UHVDC system, the generated power of the thermal power units, and the transmission power of the UHVDC lines as decision variables, and takes the maximum and minimum real-time transmission power of new energy in the UHVDC system as optimization targets. Under the conditions of satisfying the fixed transmission constraints of UHVDC, the operating constraints of the thermal power units, and the initial operating constraints of the thermal power units, the operation of the UHVDC system is simulated in time series to calculate the real-time transmission capacity of new energy in the UHVDC system.

[0140] The specific objectives and constraints of the model are as follows:

[0141] (1) Objective function

[0142] To calculate the real-time transmission capacity of renewable energy in the UHVDC system, the optimization objectives are to maximize and minimize the real-time transmission power of renewable energy in the UHVDC system. The specific formula is as follows:

[0143]

[0144]

[0145] Where, T is the length of model simulation time; Pnl t is the transmission power of renewable energy in the UHVDC system during period t.

[0146] (2) Constraints

[0147] Considering the actual operation of the UHVDC system, the model must meet the following conditions: UHVDC fixed transmission constraints, thermal power unit operation constraints, and thermal power unit initial operation constraints. The specific contents are as follows:

[0148] (1) UHVDC fixed transmission constraints

[0149]

[0150]

[0151] Where, Fl is the number of thermal power units in the UHVDC system; is the operating status of thermal power unit fl in the UHVDC system at time t; is the power generation power of thermal power unit fl in the UHVDC system at time t; Pl t ,pl t are the transmission power and planned transmission power of the UHVDC system at time t, respectively; They are respectively the downward and upward safety adjustment margins of the UHVDC system at time t based on the transmission plan.

[0152] (2) Operational constraints of thermal power units in UHVDC systems

[0153]

[0154]

[0155] Where, are the upward and downward climbing powers of the thermal power unit fl in the UHVDC system respectively; They are respectively the maximum and minimum generating capacities of the thermal power generating unit fl in the UHVDC system.

[0156] (3) Initial operating constraints of thermal power units in UHVDC systems

[0157]

[0158] Where, are respectively the unit generating power and actual generating power of the UHVDC system thermal power unit fl at the current moment.

[0159] Step 4: Based on the real-time new energy absorption capacity of the sending and receiving areas and the real-time new energy transmission capacity of the UHVDC system, establish a calculation model for the real-time new energy absorption capacity based on the sending and receiving areas and the DC system. Use mixed integer programming or commercial software to solve the model to quickly solve the real-time new energy absorption capacity of the two areas taking into account the UHVDC system.

[0160] Among them, the calculation model of the real-time absorption capacity of new energy based on the sending and receiving end areas and the DC system takes the new energy power generation power of the sending end area and the new energy power generation power of the receiving end area as decision variables, and takes the maximum and minimum new energy power generation power of the sending end area and the maximum and minimum new energy power generation power of the receiving end area as optimization targets respectively. Under the conditions of meeting the real-time absorption interval constraints of new energy in the sending end area, the real-time absorption interval constraints of new energy in the receiving end area, and the interval constraints of new energy transmission capacity of the UHVDC system, the real-time absorption capacity of new energy in the two areas of the UHVDC system is solved online and quickly.

[0161] The specific objectives and constraints of the model are as follows:

[0162] (1) Objective function

[0163] In order to quickly calculate the real-time absorption capacity of renewable energy in the two regions of the UHVDC system, the optimization targets are the maximum and minimum renewable energy power generation in the sending region and the maximum and minimum renewable energy power generation in the receiving region. The specific formula is as follows:

[0164]

[0165]

[0166]

[0167]

[0168] Where T is the length of model simulation time; Pns′ t , Pnr′ t They are respectively the renewable energy power generation power in the transmitting and receiving areas of the UHVDC system during period t.

[0169] (2) Constraints

[0170] Considering the actual operation of the cross-regional system, the model must meet the following conditions: the balance constraint of new energy consumption capacity, the real-time consumption interval constraint of new energy in the sending region, the real-time consumption interval constraint of new energy in the receiving region, and the new energy transmission capacity interval constraint of the UHVDC system. The specific contents are as follows:

[0171] (1) Balance constraints on new energy consumption capacity

[0172] Pns′ t =Pns t +Pnl t (28)

[0173] Pnr′ t =Pnr t -dPl t (29)

[0174] dPl t =Pl t -pl t (30)

[0175] Where, dPl t is the adjustment amount of the UHVDC system based on the transmission plan at time t.

[0176] (2) Constraints on the real-time consumption range of new energy in the sending area

[0177]

[0178] Where, They are respectively the real-time maximum and minimum absorption capacities of new energy in the sending area.

[0179] (3) Constraints on the real-time consumption range of new energy in the receiving area

[0180] Pnr t max ≥Pnr t ≥Pnr t min (32)

[0181] Where Pnr t max , Pnr t min They are respectively the real-time maximum and minimum absorption capacities of new energy in the sending area.

[0182] (4) Interval constraints on the real-time transmission capacity of new energy in UHVDC systems

[0183]

[0184] Where, They are respectively the real-time maximum and minimum transmission capacities of new energy in the UHVDC system.

[0185] Example 3:

[0186] Based on the same concept, the present invention provides a new energy real-time absorption capacity calculation system, combined with Figure 4 The system structure diagram provided by the present invention is introduced, and the specific steps are as follows:

[0187] A new energy real-time absorption capacity calculation system includes: an acquisition module, a regional absorption module and an absorption capacity module;

[0188] The acquisition module is used to acquire power system operation data;

[0189] The regional absorption module is used to bring the power system operation data into the pre-built real-time absorption model of new energy in the sending-end region, the real-time absorption model of new energy in the receiving-end region, and the real-time transmission model of new energy in the ultra-high voltage direct current system, respectively, to obtain the real-time absorption capacity of new energy in the sending-end region, the real-time absorption capacity of new energy in the receiving-end region, and the real-time transmission capacity of new energy in the ultra-high voltage direct current system;

[0190] The absorption capacity module is used to bring the real-time absorption capacity of new energy in the sending-end area, the real-time absorption capacity of new energy in the receiving-end area and the real-time transmission capacity of new energy in the ultra-high voltage direct current system into a pre-built calculation model to obtain the real-time absorption capacity of new energy.

[0191] The regional consumption module includes: a sending-end regional submodule, a receiving-end regional submodule and a UHVDC system submodule;

[0192] The sending-end region submodule is used to bring the power system operation data into a pre-built sending-end region new energy real-time absorption model to obtain the sending-end region new energy real-time absorption capacity;

[0193] The receiving region submodule is configured to bring the power system operation data into a pre-built receiving region new energy real-time absorption model to obtain the receiving region new energy real-time absorption capacity;

[0194] The UHVDC system submodule is used to bring the power system operation data into a pre-built UHVDC system new energy real-time absorption model to obtain the UHVDC system new energy real-time absorption capacity.

[0195] The sending-end region submodule includes: a sending-end input unit, a sending-end decision variable unit, a sending-end optimization target unit, and a sending-end constraint condition unit;

[0196] The sending-end input unit is used to input the current sending-end regional dispatch plan, load demand curve and thermal power generation plan into a pre-built sending-end regional new energy real-time consumption model to obtain the sending-end regional new energy real-time consumption capacity;

[0197] The sending-end decision variable unit is used to use the operating status of the thermal power units in the sending-end area, the generated power of the thermal power units, and the transmission power of the UHVDC line as decision variables of the real-time new energy consumption model in the sending-end area;

[0198] The sending-end optimization target unit is used to take the maximum new energy consumption in the sending-end region and the minimum new energy consumption in the sending-end region as the optimization target of the real-time new energy consumption model in the sending-end region;

[0199] The sending-end constraint condition unit is used to use the power balance constraint of the sending-end regional power system, the backup constraint of the sending-end regional power system, the operation constraint of the thermal power unit in the sending-end regional power system, the initial operation constraint of the thermal power unit in the sending-end regional power system and the ultra-high voltage direct current system transmission constraint as the constraint conditions of the real-time consumption model of new energy in the sending-end region.

[0200] The receiving end region submodule includes: a receiving end input unit, a receiving end decision variable unit, a receiving end optimization target unit and a receiving end constraint condition unit;

[0201] The receiving-end input unit is used to input the operating parameters, load demand curve and power generation plan of the thermal power units in the receiving-end region into the real-time new energy consumption model of the receiving-end region to obtain the real-time new energy consumption capacity of the receiving-end region;

[0202] The receiving-end decision variable unit is configured to use the operating status of the thermal power units in the receiving-end region, the generated power of the thermal power units, and the transmission power of the UHVDC line as decision variables of the real-time new energy consumption model in the receiving-end region;

[0203] The receiving-end optimization target unit is configured to take the maximum and minimum new energy consumption in the receiving-end region as the optimization targets of the real-time new energy consumption model in the receiving-end region;

[0204] The receiving-end constraint condition unit is used to use the power balance constraint of the receiving-end area power system, the backup constraint of the receiving-end area power system, the operation constraint of the thermal power unit in the receiving-end area power system, the initial operation constraint of the thermal power unit in the receiving-end area power system and the ultra-high voltage direct current system transmission constraint as the constraint conditions of the real-time consumption model of new energy in the receiving area.

[0205] The UHVDC system submodule includes: a UHVDC system input unit, a UHVDC system decision variable unit, a UHVDC system optimization target unit, and a UHVDC system constraint condition unit;

[0206] The UHVDC system input unit is configured to input the UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system, and the thermal power unit generation plan into the UHVDC system new energy real-time transmission model to obtain the UHVDC system new energy real-time transmission capacity;

[0207] The UHVDC system decision variable unit is configured to use the operating status of the UHVDC system thermal power generation unit, the generated power of the thermal power generation unit, and the UHVDC line transmission power as decision variables of the UHVDC system new energy real-time transmission model;

[0208] The UHVDC system optimization target unit is configured to maximize the real-time transmission power of renewable energy in the UHVDC system and minimize the real-time transmission power of renewable energy in the UHVDC system as optimization targets for the UHVDC system's real-time transmission model of renewable energy;

[0209] The UHVDC system constraint condition unit is used to use the UHVDC fixed transmission constraint, the operation constraint of the thermal power unit in the UHVDC system, and the initial operation constraint of the thermal power unit in the UHVDC system as the constraint conditions of the UHVDC system new energy real-time transmission model.

[0210] The absorption capacity module includes: a calculation model decision variable submodule, a calculation model optimization target submodule and a calculation model constraint condition submodule;

[0211] The calculation model decision variable submodule is used to use the new energy power generation power in the sending-end area and the new energy power generation power in the receiving-end area as the decision variables of the calculation model;

[0212] The calculation model optimization target submodule is used to use the maximum and minimum values ​​of the new energy power generation in the sending-end area as the optimization target of the calculation model when the new energy power generation in the sending-end area is used as the decision variable of the calculation model, and to use the maximum and minimum values ​​of the new energy power generation in the receiving-end area as the optimization target of the calculation model when the new energy power generation in the receiving-end area is used as the decision variable of the calculation model;

[0213] The calculation model constraint condition submodule is used to use the new energy consumption capacity balance constraint, the new energy real-time consumption interval constraint of the sending end area, the new energy real-time consumption interval constraint of the receiving end area and the new energy real-time transmission capacity interval constraint of the ultra-high voltage direct current system as the constraint conditions of the calculation model.

[0214] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0215] The present application is described with reference to the 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 process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0216] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0217] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0218] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for calculating the real-time absorption capacity of new energy, characterized in that: include: Obtain power system operation data; The power system operation data is respectively introduced into a pre-built real-time new energy consumption model for the sending-end region, a real-time new energy consumption model for the receiving-end region, and a real-time new energy transmission model for the ultra-high voltage direct current system to obtain the real-time new energy consumption capacity for the sending-end region, the real-time new energy consumption capacity for the receiving-end region, and the real-time new energy transmission capacity for the ultra-high voltage direct current system; The real-time new energy absorption capacity of the sending-end region, the real-time new energy absorption capacity of the receiving-end region, and the real-time new energy transmission capacity of the UHVDC system are brought into a pre-built calculation model to obtain the real-time new energy absorption capacity; The power system operation data is introduced into a pre-built UHVDC system new energy real-time absorption model to obtain the UHVDC system new energy real-time absorption capacity, including: Inputting the UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system, and the thermal power unit generation plan into the UHVDC system new energy real-time transmission model to obtain the UHVDC system new energy real-time transmission capacity; The UHVDC system new energy real-time transmission model includes: The operating status of the thermal power units in the UHVDC system, the generated power of the thermal power units, and the transmission power of the UHVDC line are used as decision variables of the real-time transmission model of new energy in the UHVDC system; The optimization objectives of the real-time transmission model of new energy in the UHVDC system are to maximize the real-time transmission power of new energy in the UHVDC system and to minimize the real-time transmission power of new energy in the UHVDC system; The constraints of the UHVDC fixed transmission constraint, the operation constraint of the thermal power units in the UHVDC system, and the initial operation constraint of the thermal power units in the UHVDC system are used as the constraint conditions of the UHVDC system new energy real-time transmission model.

2. A method for calculating the real-time absorption capacity of new energy according to claim 1, characterized in that: The power system operation data includes: the current dispatch plan in the sending-end area, the operating parameters of the thermal power units in the receiving-end area, the load demand curve, the power generation plan of the thermal power units, the UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system, and the power generation plan of the thermal power units.

3. A method for calculating the real-time absorption capacity of new energy according to claim 1 or 2, characterized in that: The power system operation data is brought into the pre-built real-time new energy consumption model of the sending-end area to obtain the real-time new energy consumption capacity of the sending-end area, including: The current sending-end regional dispatch plan, load demand curve and thermal power generation plan are input into the pre-built sending-end regional new energy real-time absorption model to obtain the sending-end regional new energy real-time absorption capacity.

4. A method for calculating the real-time absorption capacity of new energy according to claim 3, characterized in that: The real-time consumption model of new energy in the sending-end area includes: The operating status of the thermal power units in the sending-end area, the generated power of the thermal power units, and the transmission power of the UHVDC lines are used as decision variables of the real-time consumption model of new energy in the sending-end area; Taking the maximum consumption of new energy in the sending-end region and the minimum consumption of new energy in the sending-end region as the optimization objectives of the real-time consumption model of new energy in the sending-end region; The constraints of the real-time consumption model of new energy in the sending-end area are the power balance constraints of the power system in the sending-end area, the reserve constraints of the power system in the sending-end area, the operation constraints of the thermal power units in the power system in the sending-end area, the initial operation constraints of the thermal power units in the power system in the sending-end area and the transmission constraints of the UHVDC system.

5. A method for calculating the real-time absorption capacity of new energy according to claim 1 or 2, characterized in that: The power system operation data is brought into the pre-built real-time new energy consumption model of the receiving area to obtain the real-time new energy consumption capacity of the receiving area, including: The operating parameters, load demand curve and power generation plan of the thermal power units in the receiving area are input into the real-time new energy consumption model of the receiving area to obtain the real-time new energy consumption capacity of the receiving area.

6. A method for calculating the real-time absorption capacity of new energy according to claim 5, characterized in that: The real-time consumption model of new energy in the receiving area includes: The operating status of the thermal power units in the receiving area, the generated power of the thermal power units and the transmission power of the UHVDC line are used as decision variables of the real-time consumption model of new energy in the receiving area; Taking the maximum consumption of new energy in the receiving area and the minimum consumption of new energy in the receiving area as the optimization objectives of the real-time consumption model of new energy in the receiving area; The constraints of the real-time consumption model of new energy in the receiving area are the power balance constraints of the power system in the receiving area, the reserve constraints of the power system in the receiving area, the operation constraints of the thermal power units in the power system in the receiving area, the initial operation constraints of the thermal power units in the power system in the receiving area and the transmission constraints of the ultra-high voltage direct current system.

7. The method for calculating the real-time absorption capacity of new energy according to claim 1, characterized in that: The optimization objectives of the UHVDC system's new energy real-time transmission model and the UHVDC fixed transmission constraints include: The specific formula for optimizing the maximum real-time transmission power of renewable energy in the UHVDC system and the minimum real-time transmission power of renewable energy in the UHVDC system is as follows: Where, T is the length of model simulation time; Pnl t is the transmission power of renewable energy in the UHVDC system during period t; The specific formula for the UHVDC fixed transmission constraint is as follows: Where, Fl is the number of thermal power units in the UHVDC system; is the operating status of thermal power unit fl in the UHVDC system at time t; is the power generation power of thermal power unit fl in the UHVDC system at time t; Pl t ,pl t are the transmission power and planned transmission power of the UHVDC system at time t, respectively; They are respectively the downward and upward safety adjustment margins of the UHVDC system at time t based on the transmission plan.

8. The method for calculating the real-time absorption capacity of new energy according to claim 1, wherein: The calculation model includes: The power generation of renewable energy in the sending-end region and the power generation of renewable energy in the receiving-end region are used as decision variables of the calculation model; When the new energy power generation power in the sending-end region is used as the decision variable of the calculation model, the maximum and minimum values ​​of the new energy power generation power in the sending-end region are used as the optimization targets of the calculation model; when the new energy power generation power in the receiving-end region is used as the decision variable of the calculation model, the maximum and minimum values ​​of the new energy power generation power in the receiving-end region are used as the optimization targets of the calculation model; The constraints of the calculation model are the balance constraint of new energy consumption capacity, the real-time consumption interval constraint of new energy in the sending-end area, the real-time consumption interval constraint of new energy in the receiving-end area, and the real-time transmission capacity interval constraint of new energy in the UHVDC system.

9. A method for calculating the real-time absorption capacity of new energy according to claim 7 or 8, characterized in that: The optimization objectives and constraints of the computational model include: The specific formula for optimizing the maximum and minimum values ​​of the new energy power generation in the sending-end region and the maximum and minimum values ​​of the new energy power generation in the receiving-end region is as follows: Where, T is the length of model simulation time; Pns t ',Pnr t ' are the renewable energy power generation in the transmitting and receiving areas of the UHVDC system during period t; The specific formula for the balance constraint of new energy consumption capacity is as follows: Pns t '=Pns t +Pnl t Pnr t '=Pnr t -dPl t dPl t =Pl t -pl t Where, dPl t is the adjustment amount of the UHVDC system based on the transmission plan at time t; The specific formula for the real-time consumption interval constraint of new energy in the sending-end area is as follows: Where, They are the real-time maximum and minimum absorption capacity of new energy in the sending-end area respectively; The specific formula for the real-time consumption interval constraint of new energy in the receiving area is as follows: Pnr t max ≥Pnr t ≥Pnr t min Where, Pnr t max ,Pnr t min They are the real-time maximum and minimum absorption capacity of new energy in the sending-end area respectively; The specific formula for the interval constraint of the real-time transmission capacity of new energy in the UHVDC system is as follows: Where, They are respectively the real-time maximum and minimum transmission capacities of new energy in the UHVDC system.

10. A new energy real-time absorption capacity calculation system, characterized in that: include: Acquisition module, regional consumption module and consumption capacity module; The acquisition module is used to acquire power system operation data; The regional absorption module is used to bring the power system operation data into the pre-built real-time absorption model of new energy in the sending-end region, the real-time absorption model of new energy in the receiving-end region, and the real-time transmission model of new energy in the ultra-high voltage direct current system, respectively, to obtain the real-time absorption capacity of new energy in the sending-end region, the real-time absorption capacity of new energy in the receiving-end region, and the real-time transmission capacity of new energy in the ultra-high voltage direct current system; The absorption capacity module is used to bring the real-time absorption capacity of new energy in the sending-end area, the real-time absorption capacity of new energy in the receiving-end area, and the real-time transmission capacity of new energy in the UHVDC system into a pre-built calculation model to obtain the real-time absorption capacity of new energy; The regional consumption module also includes: a UHVDC system submodule; The UHVDC system submodule includes: a UHVDC system input unit, a UHVDC system decision variable unit, a UHVDC system optimization target unit, and a UHVDC system constraint condition unit; The UHVDC system input unit is configured to input the UHVDC system transmission plan, the operating parameters of the thermal power units in the UHVDC system, and the thermal power unit generation plan into the UHVDC system new energy real-time transmission model to obtain the UHVDC system new energy real-time transmission capacity; The UHVDC system decision variable unit is configured to use the operating status of the UHVDC system thermal power generation unit, the generated power of the thermal power generation unit, and the UHVDC line transmission power as decision variables of the UHVDC system new energy real-time transmission model; The UHVDC system optimization target unit is configured to maximize the real-time transmission power of renewable energy in the UHVDC system and minimize the real-time transmission power of renewable energy in the UHVDC system as optimization targets for the UHVDC system's real-time transmission model of renewable energy; The UHVDC system constraint condition unit is used to use the UHVDC fixed transmission constraint, the operation constraint of the thermal power unit in the UHVDC system, and the initial operation constraint of the thermal power unit in the UHVDC system as the constraint conditions of the UHVDC system new energy real-time transmission model.

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