Hybrid pumping and storage short-term scheduling method, device and equipment considering power transmission section capacity limitation and medium

Abstract

The invention relates to the technical field of optimal scheduling of a multi-energy complementary power generation system, in particular to a hybrid pumping and storage short-term scheduling method, device and equipment considering power transmission section capacity limitation and a medium, and the method comprises the steps: building a constraint condition of short-term scheduling considering the power transmission section capacity limitation by taking the minimum total cost of a system as an objective function; the constraint conditions comprise hybrid pumped storage hydraulic power, power and operation constraint; wind and light constraints are abandoned; wind power and photovoltaic output constraint; carrying out transmission capacity limitation constraint on the power transmission section; constructing a short-term scheduling model considering the power transmission section capacity limitation according to the target function and the constraint condition; performing linearization processing on the constraint of the hybrid pumping storage in the constraint condition; and solving the linearized short-term scheduling model to obtain a scheduling result. According to the method, new load characteristics and power transmission capacity limitation of the power transmission section under the power utilization structure change can be fully considered, the power transmission pressure of the power transmission section is reduced, and the effect of better promoting new energy consumption is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optimization scheduling of multi-energy complementary power generation systems, and in particular to a hybrid pumped storage short-term scheduling method, device, equipment and medium taking into account transmission section capacity limitations. Background Art

[0002] With the development of the national economy, the electricity consumption structure has also changed, and the load has shown the characteristics of high load at night and low load during the day. The installed capacity of new energy sources such as wind power and photovoltaics has been continuously increasing, but because the output of wind power and photovoltaics cannot change with the load curve, their uncertainty and randomness have increased the abandonment rate of wind and light. Therefore, the application of flexible power sources and wind power and photovoltaics to complement each other is an effective means to promote the consumption of new energy.

[0003] Hydropower has attracted wide attention due to its flexible regulation and clean and environmentally friendly characteristics. As a new type of hydropower station, the hybrid pumped storage power station has a large power generation capacity and a higher regulation capacity compared to the pumped storage power station. Compared with the cascade hydropower station, it has a new pumped storage function, with low investment and short construction period. Therefore, the hybrid pumped storage power station has a more flexible regulation capacity and a more economical operation mode, and has received more attention.

[0004] In the existing technology, more attention is paid to the complementary operation of cascade hydropower stations and pumped storage power stations with renewable energy, but there is little research on the short-term scheduling of hybrid pumped storage to promote the consumption of renewable energy and reduce the transmission pressure of transmission sections under new load characteristics. Therefore, how to consider the short-term scheduling after the change of power structure, reduce the abandonment rate of wind and solar power, reduce the transmission pressure and system operation cost of the transmission section, and the short-term scheduling method of hybrid pumped storage considering the capacity limitation of the transmission section is an urgent problem to be solved by technicians in this field.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0006] The present invention provides a hybrid pumped storage short-term scheduling method, device, equipment and medium taking into account the transmission section capacity limitation, thereby effectively solving the problems in the background technology.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a hybrid pumped storage short-term scheduling method considering the transmission section capacity limitation, comprising the following steps:

[0008] Taking the minimum total system cost as the objective function, the constraints of short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of transmission section are established. The constraints include: hydraulic, power and operation constraints of hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; transmission capacity limitation constraints of transmission section;

[0009] A wind-solar-hybrid pumped storage short-term dispatch model considering the transmission section capacity limitation is constructed based on the objective function and constraint conditions;

[0010] Linearizing the constraints of the hybrid pumped storage in the constraints;

[0011] The linearized short-term scheduling model is solved to obtain a scheduling result.

[0012] Furthermore, the objective function includes:

[0013]

[0014]

[0015]

[0016] F t wind =C wind ·P t wind,dep Δt;

[0017] F t pv =C pv ·P t pv,dep Δt;

[0018] Where F is the total cost of system operation; T is the number of time periods in a scheduling cycle; F t H is the power generation cost of all conventional hydropower units in the system during period t; F t PS is the operating cost of all pumped storage units in the system during period t; F t wind and F t pv are the penalties for wind and solar abandonment during period t; C H and C PS are the unit power generation costs of conventional hydropower units and pumped storage units respectively; C wind and C pv are the penalty costs for unit wind and solar power abandonment, respectively; G is the number of conventional hydropower units in the hybrid pumped-storage power station; N is the number of pumped-storage units in the hybrid pumped-storage power station; is the power generation of conventional hydropower unit g in period t; and is the generating power and pumping power of pumped storage unit n in period t; P t wind,dep and P t pv,dep is the wind and solar power abandoned in period t; Δt is the scheduling step length, which is 1h.

[0019] Furthermore, among the constraints, the hydraulic constraints of the hybrid pumped storage include:

[0020] Power station reservoir water quantity constraints:

[0021] V t =V t-1 +3600Δt(I t -Q t );

[0022]

[0023] Where V t I is the reservoir capacity of the hybrid pumped storage power station at the end of period t; t is the natural runoff water volume of the reservoir during period t; Q t is the outflow of the hybrid pumped-storage power station during period t, which is composed of the power generation flow of the conventional units and the power generation and pumping flow of the pumped-storage units; is the power generation flow of the conventional unit g during period t; is the power generation flow of pumped storage unit n during period t; is the pumping flow of pumped storage unit n during period t;

[0024] Power station water level and reservoir capacity control constraints:

[0025] Z min ≤Z t ≤Z max ;

[0026] V min ≤V t ≤V max ;

[0027] Z0=Z begin , Z T =Z end ;

[0028] V0=V begin , V T =V end ;

[0029] In the formula, Z t is the water level in front of the power station at the end of time period t; Z max and Zmin are the upper and lower limits of the water level of the power station; V max and V min are the upper and lower limits of the power station’s storage capacity; Z0 and Z T are the actual water levels of the power station at the beginning and end of the dispatch period respectively; Z begin and Z end are the initial and final control water levels of the power station; V0 and V T are the actual storage capacity of the power station at the beginning and end of the dispatch period respectively; V begin and V end are the initial and final target storage capacities of the power station respectively;

[0030] Water level-reservoir capacity relationship constraints:

[0031] Z t =f ZV (V t );

[0032] In the formula, f ZV (·) is the functional relationship between the water level in front of the dam and the reservoir capacity;

[0033] Constraints on unit power generation and pumping flow:

[0034]

[0035] In the formula, is a 0-1 variable indicating the working state of the conventional unit g during period t. If the unit is in the startup state, it is 1; otherwise, if it is in the shutdown state, it is 0. and They are 0-1 variables of the working state of pumped storage unit n in period t. If it is 1, it is in power generation or pumping state, otherwise it is in shutdown state, and it is 0; and They are the upper and lower limits of the power generation flow of conventional unit g respectively; and They are the upper and lower limits of the power generation flow of pumped storage unit n respectively; and are the upper and lower limits of pumping flow rate of pumped storage unit n respectively.

[0036] Furthermore, among the constraints, the power constraints of the hybrid pumped storage include:

[0037] Unit power generation and pumping power constraints:

[0038]

[0039]

[0040]

[0041] In the formula, is the power generation efficiency of the conventional unit g; is the power generation efficiency of pumped storage unit n; is the pumping efficiency of pumped storage unit n;

[0042] Output constraints of conventional hydropower units:

[0043]

[0044] In the formula, and They are the upper and lower limits of the power generation of conventional unit g respectively;

[0045] Output constraints of pumped storage units:

[0046]

[0047] In the formula, and are the upper and lower limits of the power generation capacity of pumped storage unit n respectively; and They are the upper and lower limits of the pumping power of pumped storage unit n respectively.

[0048] Furthermore, among the constraints, the operation constraints of the hybrid pumped storage include:

[0049] Unit start and stop status constraints:

[0050]

[0051]

[0052] Unit start-up and shutdown operation constraints:

[0053]

[0054]

[0055] Among them, u g,t and v g,t They are 0-1 variables indicating whether the unit g is turned on or off during period t. If it is 1, it means that the unit is turned on or off, otherwise it is 0.

[0056] Minimum start and stop duration constraints for the unit:

[0057]

[0058] Among them, T g on and T g off is the minimum start and stop time of unit g.

[0059] Furthermore, the wind power abandonment and solar power abandonment constraints in the constraint conditions include:

[0060]

[0061]

[0062] In the formula, and are the abandoned wind and abandoned optical powers of node a in period t, respectively; and are the outputs of the wind farm and photovoltaic power station at node a during period t respectively.

[0063] Furthermore, the wind power and photovoltaic output constraints in the constraints include:

[0064]

[0065]

[0066]

[0067]

[0068] In the formula, and are the wind power and photovoltaic grid-connected power at node a during period t respectively.

[0069] Furthermore, in the constraints, the transmission section capacity limitation constraint includes:

[0070] -P branch ≤P trans ≤P branch ;

[0071]

[0072]

[0073] Where P trans is the transmission power of the transmission section; P branch The upper limit of transmission capacity of the transmission section; The power of node a during period t is input, including the output of photovoltaic, wind power and hybrid pumped storage power station; is the load of node a during period t; P ab,t is the power transmitted from node a to node b during period t; is the power input to node a of the hybrid pumped storage power station during period t.

[0074] Furthermore, solving the linearized short-term scheduling model includes:

[0075] The short-term scheduling model is solved by calling the CPLEX solver using Yalmip to obtain the output of conventional units in the hybrid pumped-storage power station, the output of pumped-storage units in the hybrid pumped-storage power station and the transmission power of the transmission section.

[0076] The present invention also includes a hybrid pumped storage short-term dispatching device taking into account the transmission section capacity limitation, using the above method, the device includes:

[0077] The target constraint unit is used to establish the constraint conditions for the short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of the transmission section with the lowest total system cost as the objective function. The constraint conditions include: hydraulic, power and operation constraints of the hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; transmission capacity limitation constraints of the transmission section;

[0078] A modeling unit, used for constructing a wind-solar-hybrid pumped storage short-term dispatching model considering the transmission section capacity limitation based on the objective function and constraint conditions;

[0079] A linearization unit, used for linearizing the constraints of the hybrid pumped storage in the constraints;

[0080] The solving unit is used to solve the linearized short-term scheduling model to obtain a scheduling result.

[0081] The present invention also includes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described above is implemented.

[0082] The present invention also includes a storage medium on which a computer program is stored. When the computer program is executed by a processor, the method described above is implemented.

[0083] The beneficial effects of the present invention are as follows: taking minimizing the total system cost as the objective function, taking the hydraulic, electrical, and operational constraints of the hybrid pumped storage, the wind and solar power abandonment constraints, the wind power and photovoltaic output constraints, and the transmission section capacity limitation constraints as constraint conditions, a wind-solar-hybrid pumped storage short-term scheduling model considering the transmission section capacity limitation is established, and finally the model is solved to obtain the optimized scheduling result, which can fully consider the new load characteristics and the transmission capacity limitation of the transmission section under the change of the power consumption structure. Compared with the traditional hydro-wind-solar complementary system, it can reduce the transmission pressure of the transmission section, reduce the system operation cost, and better promote the effect of new energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0085] Figure 1 is a flow chart of the method in Example 1;

[0086] Figure 2 It is a structural schematic diagram of the device in Example 1;

[0087] Figure 3 It is a structural diagram of each node in the example of embodiment 2;

[0088] Figure 4 is a per unit value curve diagram of the load in Example 2;

[0089] Figure 5 This is a graph showing the output results of conventional hydropower in a hybrid pumped storage power station in Example 2;

[0090] Figure 6 This is a diagram showing the output results of the pumped storage in the hybrid pumped storage power station in Example 2;

[0091] Figure 7 This is a diagram showing the power transmission result of the power transmission section in Example 2;

[0092] Figure 8 This is the grid-connected power result diagram of the photovoltaic power station at node c in Example 2;

[0093] Fig. 9 This is the grid-connected power result diagram of the wind farm at node a in Example 2.

[0094] Fig.10 It is a schematic diagram of the structure of the computer device of the present invention. DETAILED DESCRIPTION

[0095] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0096] like Figure 1 As shown: A hybrid pumped storage short-term scheduling method considering transmission section capacity limitation includes the following steps:

[0097] Taking the minimum total system cost as the objective function, the constraints for the short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of the transmission section are established. The constraints include: hydraulic, power and operation constraints of the hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; transmission capacity limitation constraints of the transmission section;

[0098] A wind-solar-hybrid pumped storage short-term dispatch model considering the transmission section capacity limitation is constructed based on the objective function and constraint conditions.

[0099] Linearize the constraints of hybrid pumped storage in the constraints;

[0100] The linearized short-term scheduling model is solved to obtain the scheduling result.

[0101] Taking minimizing the total system cost as the objective function, and taking the hydraulic, electrical, and operation constraints of hybrid pumped storage, wind and solar abandonment constraints, wind power and photovoltaic output constraints, and transmission section capacity limitation constraints as constraints, a wind-solar-hybrid pumped storage short-term scheduling model considering the transmission section capacity limitation is established. Finally, the model is solved to obtain the optimized scheduling result, which can fully consider the new load characteristics and transmission capacity limitations of the transmission section under the changes in the power consumption structure. Compared with the traditional hydro-wind-solar complementary system, it can reduce the transmission pressure of the transmission section, reduce the system operation cost, and better promote the effect of new energy consumption.

[0102] In this embodiment, the objective function includes:

[0103]

[0104]

[0105]

[0106]

[0107]

[0108] Where F is the total cost of system operation; T is the number of time periods in a scheduling cycle; F t H is the power generation cost of all conventional hydropower units in the system during period t; F t PS is the operating cost of all pumped storage units in the system during period t; F t wind and F t pv are the penalties for wind and solar abandonment during period t; C H and C PS are the unit power generation costs of conventional hydropower units and pumped storage units respectively; C wind and Cpv are the penalty costs for unit wind and solar power abandonment, respectively; G is the number of conventional hydropower units in the hybrid pumped-storage power station; N is the number of pumped-storage units in the hybrid pumped-storage power station; is the power generation of conventional hydropower unit g in period t; and is the generating power and pumping power of pumped storage unit n in period t; P t wind,dep and P t pv,dep is the wind and solar power abandoned in period t; Δt is the scheduling step length, which is 1h.

[0109] Among the constraints, the hydraulic constraints of hybrid pumped storage include:

[0110] Power station reservoir water quantity constraints:

[0111] V t =V t-1 +3600Δt(I t -Q t );

[0112]

[0113] Where V t I is the reservoir capacity of the hybrid pumped storage power station at the end of period t; t is the natural runoff water volume of the reservoir during period t; Q t is the outflow of the hybrid pumped-storage power station during period t, which is composed of the power generation flow of the conventional units and the power generation and pumping flow of the pumped-storage units; is the power generation flow of the conventional unit g during period t; is the power generation flow of pumped storage unit n during period t; is the pumping flow of pumped storage unit n during period t;

[0114] Power station water level and reservoir capacity control constraints:

[0115] Z min ≤Z t ≤Z max ;

[0116] V min ≤V t ≤V max ;

[0117] Z0=Z begin , Z T =Z end ;

[0118] V0=V begin , V T =V end ;

[0119] In the formula, Z t is the water level in front of the power station at the end of time period t; Z max and Z min are the upper and lower limits of the water level of the power station; V max and V min are the upper and lower limits of the power station’s storage capacity; Z0 and Z T are the actual water levels of the power station at the beginning and end of the dispatch period respectively; Z begin and Z end are the initial and final control water levels of the power station; V0 and V T are the actual storage capacity of the power station at the beginning and end of the dispatch period respectively; V begin and V end are the initial and final target storage capacities of the power station respectively;

[0120] Water level-reservoir capacity relationship constraints:

[0121] Z t =f ZV (V t );

[0122] In the formula, f ZV (·) is the functional relationship between the water level in front of the dam and the reservoir capacity;

[0123] Constraints on unit power generation and pumping flow:

[0124]

[0125]

[0126]

[0127] In the formula, is a 0-1 variable indicating the working state of the conventional unit g during period t. If the unit is in the startup state, it is 1; otherwise, if it is in the shutdown state, it is 0. and They are 0-1 variables of the working state of pumped storage unit n in period t. If it is 1, it is in power generation or pumping state, otherwise it is in shutdown state, and it is 0; and They are the upper and lower limits of the power generation flow of conventional unit g respectively; and They are the upper and lower limits of the power generation flow of pumped storage unit n respectively; and are the upper and lower limits of pumping flow rate of pumped storage unit n respectively.

[0128] Among the constraints, the power constraints of hybrid pumped storage include:

[0129] Constraints on unit power generation and pumping power:

[0130]

[0131]

[0132]

[0133] In the formula, is the power generation efficiency of the conventional unit g; is the power generation efficiency of pumped storage unit n; is the pumping efficiency of pumped storage unit n;

[0134] Output constraints of conventional hydropower units:

[0135]

[0136] In the formula, and They are the upper and lower limits of the power generation of conventional unit g respectively;

[0137] Output constraints of pumped storage units:

[0138]

[0139]

[0140] In the formula, and are the upper and lower limits of the power generation capacity of pumped storage unit n respectively; and They are the upper and lower limits of the pumping power of pumped storage unit n respectively.

[0141] The operating constraints of hybrid pumped storage include:

[0142] Unit start and stop status constraints:

[0143]

[0144]

[0145] Unit start-up and shutdown operation constraints:

[0146] u g,t +v g,t ≤1;

[0147]

[0148] Among them, u g,t and v g,t They are 0-1 variables indicating whether the unit g is turned on or off during period t. If it is 1, it means that the unit is turned on or off, otherwise it is 0.

[0149] Minimum start and stop duration constraints for the unit:

[0150]

[0151] in, and is the minimum start and stop time of unit g.

[0152] The constraints for abandoning wind and solar power include:

[0153]

[0154]

[0155] In the formula, and are the abandoned wind and abandoned optical powers of node a in period t, respectively; and are the outputs of the wind farm and photovoltaic power station at node a during period t respectively.

[0156] The wind power and photovoltaic output constraints in the constraints include:

[0157]

[0158]

[0159]

[0160]

[0161] In the formula, and are the wind power and photovoltaic grid-connected power at node a during period t respectively.

[0162] Among the constraints, the transmission section capacity restriction constraints include:

[0163] -P branch ≤P trans ≤P branch ;

[0164]

[0165]

[0166] Where P trans is the transmission power of the transmission section; P branch The upper limit of transmission capacity of the transmission section; The power of node a during period t is input, including the output of photovoltaic, wind power and hybrid pumped storage power station; is the load of node a during period t; P ab,t is the power transmitted from node a to node b during period t; is the power input to node a of the hybrid pumped storage power station during period t.

[0167] Among them, solving the linearized short-term scheduling model includes:

[0168] Yalmip is used to call the CPLEX solver to solve the short-term scheduling model, and the output of conventional units in the hybrid pumped-storage power station, the output of pumped-storage units in the hybrid pumped-storage power station and the transmission power of the transmission section are obtained.

[0169] like Figure 2 As shown, this embodiment also includes a hybrid pumped storage short-term scheduling device that takes into account the transmission section capacity limitation. Using the above method, the device includes:

[0170] The target constraint unit is used to establish the constraint conditions for the short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of the transmission section with the lowest total system cost as the objective function. The constraints include: hydraulic, power and operation constraints of the hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; and transmission capacity limitation constraints of the transmission section.

[0171] A modeling unit, which is used to construct a wind-solar-hybrid pumped storage short-term dispatching model taking into account the capacity limitation of the transmission section based on the objective function and constraint conditions;

[0172] A linearization unit is used to perform linearization processing on the constraints of the hybrid pumped storage in the constraint conditions;

[0173] The solving unit is used to solve the linearized short-term scheduling model to obtain the scheduling result.

[0174] Embodiment 2:

[0175] In order to demonstrate the effectiveness of the wind-solar-hybrid pumped storage short-term scheduling method provided by the present invention that takes into account the transmission section capacity limitation and the changes in the electricity consumption structure, it is described below in combination with specific application scenarios.

[0176] like Figure 3 As shown, this embodiment includes six photovoltaic power stations and one wind farm, and a hybrid pumped storage power station, which includes six conventional hydropower units and six pumped storage units. The load per unit value is as follows: Figure 4 shown.

[0177] Output of a wind farm:

[0178] [0.8996;0.4591;0.5774;0.7818;0.7325;0.6321;0.5276;0.4251;0.2265;0.1049;0.0116;0.0460;0 .0104;0.0481;0.0531;0.0556;0.2198;0.2837;0.4936;0.5015;0.3857;0.6831;1;0.8399]*150(MW);

[0179] Output of a photovoltaic power station:

[0180] [0;0;0;0;0;0;0.0269;0.0705;0.1686;0.3981;0.3682;0.7827;1;0.9990;0.9051;0.7433;0.4570;0.2537;0.0628;0;0;0;0;0]*150(MW);

[0181] First, the objective function of wind-solar-hybrid pumped storage short-term dispatch considering the transmission section capacity limitation is established as follows:

[0182]

[0183]

[0184]

[0185] F t wind =C wind ·P t wind,dep Δt;

[0186] F t pv =C pv ·P t pv,dep Δt;

[0187] Among them, F is the total cost of system operation; T is the number of time periods in a scheduling cycle; F t H is the power generation cost of all cascade hydropower units in the system during period t; F t PS is the operating cost of all pumped storage units in the system during period t; F t wind and F t pv are the penalties for wind and solar abandonment during period t; C H and C PS are the unit power generation costs of conventional hydropower units and pumped storage units respectively; Cwind and C pv are the penalty costs for unit wind and solar power abandonment, respectively; G is the number of conventional hydropower units in the hybrid pumped-storage power station; N is the number of pumped-storage units in the hybrid pumped-storage power station; is the power generation of conventional hydropower unit g in period t; and is the generating power and pumping power of pumped storage unit n in period t; P t wind,dep and P t pv,dep is the wind and solar power abandoned in period t; Δt is the scheduling step length, which is 1h.

[0188] Then, the hydraulic constraints of hybrid pumped storage are established, including the water volume constraint of power station reservoir, the water level and storage capacity control constraint of power station, the water level-storage capacity relationship constraint, and the power generation and pumping flow constraint of the unit:

[0189] 1) Power station reservoir water volume constraints:

[0190] V t =V t-1 +3600Δt(I t -Q t );

[0191]

[0192] Among them, V t I is the reservoir capacity of the hybrid pumped storage power station at the end of period t; t is the natural runoff water volume of the reservoir during period t; Q t is the outflow of the hybrid pumped-storage power station during period t, which is composed of the power generation flow of the conventional units and the pumped-storage units and the pumping flow of the pumped-storage units; is the power generation flow of the conventional unit g during period t; is the power generation flow of pumped storage unit n during period t; is the pumping flow of pumped storage unit n during period t;

[0193] 2) Power station water level and reservoir capacity control constraints:

[0194] Z min ≤Z t ≤Z max ;

[0195] V min ≤V t ≤V max ;

[0196] Z0=Z begin , Z T =Z end ;

[0197] V0=V begin , V T =V end ;

[0198] Among them, Z t is the water level in front of the power station at the end of time period t; Z max and Z min are the upper and lower limits of the water level of the power station; Z0 and Z T are the actual water levels of the power station at the beginning and end of the dispatch period respectively; Z begin and Z end They are the initial and final control water levels of the power station respectively. max and V min are the upper and lower limits of the power station’s storage capacity; V0 and V T are the storage capacity of the power station at the beginning and end of the dispatch period respectively; V begin and V end are the initial and final target storage capacities of the power station respectively;

[0199] 3) Water level-reservoir capacity relationship constraints:

[0200] Z t =f ZV (V t );

[0201] Among them, f ZV (·) is the functional relationship between the water level in front of the dam and the reservoir capacity;

[0202] 4) Constraints on unit power generation and pumping flow:

[0203]

[0204]

[0205]

[0206] in, is a 0-1 variable indicating the working state of the conventional unit g during period t. If the unit is in the startup state, it is 1; otherwise, if it is in the shutdown state, it is 0. and They are 0-1 variables of the working state of the nth pumped storage unit in period t. If it is 1, it is in the power generation or pumping state, otherwise it is in the shutdown state, and it is 0; and They are the upper and lower limits of the power generation flow of conventional unit g respectively; and They are the upper and lower limits of the power generation flow of pumped storage unit n respectively; and are the upper and lower limits of pumping flow rate of pumped storage unit n respectively.

[0207] The parameters of the hybrid pumped storage power station are shown in Table 1:

[0208] Table 1 Parameters of hybrid pumped storage power station

[0209]

[0210] Then, the power-related constraints of the hybrid pumped storage power station are established, including the unit power generation and pumping power constraints, the conventional hydropower unit output constraints, and the pumped storage unit output constraints:

[0211] 1) Constraints on unit power generation and pumping power:

[0212]

[0213]

[0214]

[0215] in, is the power generation efficiency of the conventional unit g; is the power generation efficiency of pumped storage unit n; is the pumping efficiency of pumped storage unit n;

[0216] 2) Output constraints of conventional hydropower units:

[0217]

[0218] in, and P g,min They are the upper and lower limits of the power generation of conventional unit g respectively;

[0219] 3) Output constraints of pumped storage units:

[0220]

[0221]

[0222] in, and are the upper and lower limits of the power generation capacity of pumped storage unit n respectively; and They are the upper and lower limits of the pumping power of pumped storage unit n respectively.

[0223] The parameters of conventional hydropower units are shown in Table 2:

[0224] Table 2 Parameters of conventional hydropower units

[0225]

[0226] The parameters of the pumped storage unit are shown in Table 3:

[0227] Table 3 Pumped storage unit parameters

[0228]

[0229] Then, the operation-related constraints of the hybrid pumped storage power station are established, including the unit start-up and shutdown state constraints, the unit start-up and shutdown operation constraints, and the unit minimum start-up and shutdown duration constraints:

[0230] 1) Constraints on the start and stop status of the unit:

[0231]

[0232]

[0233] 2) Unit start-up and shutdown operation constraints:

[0234] u g,t +v g,t ≤1;

[0235]

[0236] Among them, u g,t and v g,t They are 0-1 variables indicating whether the unit g is turned on or off during period t. If it is 1, it means that the unit is turned on or off, otherwise it is 0.

[0237] 3) Minimum start and stop duration constraints of the unit:

[0238]

[0239] in, and is the minimum start and stop time of unit g.

[0240] Then establish wind and solar abandonment constraints:

[0241]

[0242]

[0243] in, and are the abandoned wind and abandoned optical powers of node a in period t, respectively; and are the outputs of the wind farm and photovoltaic power station at node a during period t respectively.

[0244] Then establish wind power and photovoltaic output constraints:

[0245]

[0246]

[0247]

[0248]

[0249] in, and are the wind power and photovoltaic grid-connected power at node a during period t respectively.

[0250] Then, establish the transmission section capacity limit constraint:

[0251] -P branch ≤P trans ≤P branch ;

[0252]

[0253]

[0254] Among them, P trans is the transmission power of the transmission section; P branch The upper limit of transmission capacity of the transmission section; The power of node a during period t is input, including the output of photovoltaic, wind power and hybrid pumped storage power station; Enter the load of node a for period t; P ab,t is the power transmitted from node a to node b during period t; is the power input to node a of the hybrid pumped storage power station during period t.

[0255] Finally, Yalmip is used to call the CPLEX solver to solve the wind-solar-hybrid pumped storage short-term scheduling model considering the transmission section capacity limitation and the change of power consumption structure, and the short-term scheduling scheme of the wind-solar-hybrid pumped storage system considering the transmission section capacity limitation is obtained. Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The output results of conventional hydropower and pumped storage in hybrid pumped-storage power stations, the transmission power results of transmission sections, the grid-connected photovoltaic power consumption results, and the grid-connected wind power consumption results are shown respectively.

[0256] The scheme in this embodiment proves that under full consideration of the new load characteristics under the changes in the electricity consumption structure and the transmission capacity limitations of the transmission section, compared with the traditional hydro-wind-solar complementary system, it can reduce the transmission pressure of the transmission section, reduce the system operating cost, and better promote the effect of new energy consumption.

[0257] See also Fig.10A computer device 400 provided in an embodiment of the present application includes: a processor 410 and a memory 420, wherein the memory 420 stores a computer program executable by the processor 410, and when the computer program is executed by the processor 410, the above method is executed.

[0258] The embodiment of the present application further provides a storage medium 430 on which a computer program is stored. When the computer program is run by the processor 410, the above method is executed.

[0259] Among them, the storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable red-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, disk or optical disk.

[0260] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0261] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0262] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0263] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0264] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0265] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0266] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0267] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hybrid pumped storage short-term dispatching method considering transmission section capacity limitation, characterized in that: The steps include: Taking the minimum total system cost as the objective function, the constraints of short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of transmission section are established. The constraints include: hydraulic, power and operation constraints of hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; transmission capacity limitation constraints of transmission section; A wind-solar-hybrid pumped storage short-term dispatch model considering the transmission section capacity limitation is constructed based on the objective function and constraint conditions; Linearizing the constraints of the hybrid pumped storage in the constraints; The linearized short-term scheduling model is solved to obtain a scheduling result.

2. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: The objective function includes: F t wind =C wind ·P t wind,dep ·Δt; F t pv =C pv ·P t pv,dep ·Δt; Where F is the total cost of system operation; T is the number of time periods in a scheduling cycle; F t H is the power generation cost of all conventional hydropower units in the system during period t; F t PS is the operating cost of all pumped storage units in the system during period t; F t wind and F t pv are the penalties for wind and solar abandonment during period t; C H and C PS are the unit power generation costs of conventional hydropower units and pumped storage units respectively; C wind and C pv are the penalty costs for unit wind and solar power abandonment, respectively; G is the number of conventional hydropower units in the hybrid pumped-storage power station; N is the number of pumped-storage units in the hybrid pumped-storage power station; is the power generation of conventional hydropower unit g in period t; and is the generating power and pumping power of pumped storage unit n in period t; P t wind,dep and P t pv,dep is the wind and solar power abandoned in period t; Δt is the scheduling step length, which is 1h.

3. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: Among the constraints, the hydraulic constraints of hybrid pumped storage include: Power station reservoir water quantity constraints: V t =V t-1 +3600Δt(I t -Q t ); Where V t I is the reservoir capacity of the hybrid pumped storage power station at the end of period t; t is the natural runoff water volume of the reservoir during period t; Q t is the outflow of the hybrid pumped-storage power station during period t, which is composed of the power generation flow of the conventional units and the power generation and pumping flow of the pumped-storage units; is the power generation flow of the conventional unit g during period t; is the power generation flow of pumped storage unit n during period t; is the pumping flow of pumped storage unit n during period t; Power station water level and reservoir capacity control constraints: WITH min ≤Z t ≤Z max ; In min ≤V t ≤V max ; Z0=Z begin ,WITH T =Z end ; V0=V begin ,V T =V end ; In the formula, Z t is the water level in front of the power station at the end of time period t; Z max and Z min are the upper and lower limits of the water level of the power station; V max and V min are the upper and lower limits of the power station’s storage capacity; Z0 and Z T are the actual water levels of the power station at the beginning and end of the dispatch period respectively; Z begin and Z end are the initial and final control water levels of the power station; V0 and V T are the actual storage capacity of the power station at the beginning and end of the dispatch period respectively; V begin and V end are the initial and final target storage capacities of the power station respectively; Water level-reservoir capacity relationship constraints: With t =f ZV (In t ); In the formula, f ZV (·) is the functional relationship between the water level in front of the dam and the reservoir capacity; Constraints on unit power generation and pumping flow: In the formula, is a 0-1 variable indicating the working state of the conventional unit g during period t. If the unit is in the startup state, it is 1; otherwise, if it is in the shutdown state, it is 0. and They are 0-1 variables of the working state of pumped storage unit n in period t. If it is 1, it is in power generation or pumping state, otherwise it is in shutdown state, and it is 0; and They are the upper and lower limits of the power generation flow of conventional unit g respectively; and They are the upper and lower limits of the power generation flow of pumped storage unit n respectively; and are the upper and lower limits of pumping flow rate of pumped storage unit n respectively.

4. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: Among the constraints, the power constraints of the hybrid pumped storage include: Constraints on unit power generation and pumping power: In the formula, is the power generation efficiency of the conventional unit g; is the power generation efficiency of pumped storage unit n; is the pumping efficiency of pumped storage unit n; Output constraints of conventional hydropower units: In the formula, and They are the upper and lower limits of the power generation of conventional unit g respectively; Output constraints of pumped storage units: In the formula, and are the upper and lower limits of the power generation capacity of pumped storage unit n respectively; and They are the upper and lower limits of the pumping power of pumped storage unit n respectively.

5. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: Among the constraints, the operation constraints of the hybrid pumped storage system include: Unit start and stop status constraints: Unit start-up and shutdown operation constraints: u g,t +v g,t ≤1; Among them, u g,t and v g,t They are 0-1 variables indicating whether the unit g is turned on or off during period t. If it is 1, it means that the unit is turned on or off, otherwise it is 0. Minimum start and stop duration constraints for the unit: in, and is the minimum start and stop time of unit g.

6. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: The constraints for abandoning wind and solar power include: In the formula, and are the abandoned wind and abandoned optical powers of node a in period t, respectively; and are the outputs of the wind farm and photovoltaic power station at node a during period t respectively.

7. The hybrid pumped storage short-term dispatching method considering transmission section capacity limitation according to claim 6 is characterized in that: The wind power and photovoltaic output constraints in the constraints include: In the formula, and are the wind power and photovoltaic grid-connected power at node a during period t respectively.

8. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: Among the constraints, the transmission section capacity limitation constraints include: -P branch ≤P trans ≤P branch ; Where P trans is the transmission power of the transmission section; P branch The upper limit of transmission capacity of the transmission section; The power of node a during period t is input, including the output of photovoltaic, wind power and hybrid pumped storage power station; is the load of node a during period t; P ab,t is the power transmitted from node a to node b during period t; is the power input to node a of the hybrid pumped storage power station during period t.

9. The hybrid pumped storage short-term scheduling method considering transmission section capacity limitation according to claim 1 is characterized in that: The solving of the linearized short-term scheduling model includes: The short-term scheduling model is solved by calling the CPLEX solver using Yalmip to obtain the output of conventional units in the hybrid pumped-storage power station, the output of pumped-storage units in the hybrid pumped-storage power station and the transmission power of the transmission section.

10. A hybrid pumped storage short-term dispatching device considering the transmission section capacity limitation, characterized in that: Using the method according to any one of claims 1 to 9, the device comprises: The target constraint unit is used to establish the constraint conditions for the short-term dispatch of wind-solar-hybrid pumped storage considering the capacity limitation of the transmission section with the lowest total system cost as the objective function. The constraint conditions include: hydraulic, power and operation constraints of the hybrid pumped storage; wind and solar abandonment constraints; wind power and photovoltaic output constraints; transmission capacity limitation constraints of the transmission section; A modeling unit, used for constructing a wind-solar-hybrid pumped storage short-term dispatching model considering the transmission section capacity limitation based on the objective function and constraint conditions; A linearization unit, used for linearizing the constraints of the hybrid pumped storage in the constraints; The solving unit is used to solve the linearized short-term scheduling model to obtain a scheduling result.

11. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

12. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 9 is implemented.

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