New energy power system safety scheduling method and device considering power flow

Abstract

The invention discloses a new energy power system safety scheduling method considering power flow, and relates to the technical field of new energy. Coal consumption cost of a thermal power generating unit and wind and light abandoning cost of new energy power generation are considered for a power system with high-proportion new energy; scheduling the power system to obtain an original scheduling plan of the new energy power station; according to the weight of each new energy power station in the fair scheduling of the power system, redistributing the original scheduling plan of the new energy power station to obtain a fair scheduling plan of the new energy power station; and according to the fair scheduling plan of the new energy power station, comprehensively considering new energy unit constraints and power grid safe and stable operation constraints, and finally determining a safe scheduling plan of the new energy power station. The invention discloses a new energy power system safety scheduling device considering power flow, which can further improve the utilization rate of new energy power generation and guarantee safe and stable operation of a power grid, and has important value for improving new energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a new energy power system safety dispatching method and device taking power flow into consideration. Background Art

[0002] With the transformation of the global energy structure, the proportion of new energy such as wind power and solar energy has increased year by year, and the power system is undergoing profound changes. The traditional power system dispatching method based on fossil energy has been unable to adapt to the challenges brought by the large-scale access of new energy. The intermittent and volatile nature of new energy generation makes it difficult to predict and control the power flow, which has brought great pressure to the safe and stable operation of the power system. At present, most of the research on the dispatching of new energy power systems is considered from a single economic perspective, lacking consideration of the safe operation of the power system and the fair dispatching of new energy. In view of this, in the dispatching of power systems with a high proportion of new energy, how to comprehensively consider dispatching from multiple perspectives such as safety, fairness, and economy to improve the efficient and safe operation of the power system is an issue that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a new energy power system safe dispatching method and device taking into account the power flow. The present invention can not only ensure the safe and stable operation of the power system, but also realize the economically optimized new energy power system safe and economic dispatching method, further improve the utilization rate of new energy, and is of great significance for promoting the transformation of energy structure and promoting the sustainable development of the power industry.

[0004] The present invention adopts the following technical solutions to solve the above technical problems:

[0005] In a first aspect, a new energy power system security dispatching method considering power flow proposed in the present invention includes:

[0006] For power systems with a high proportion of renewable energy, the coal consumption cost of thermal power units and the cost of wind and solar power abandonment of renewable energy power generation are considered, and the power system is dispatched to obtain the original dispatch plan of renewable energy power stations;

[0007] According to the weight of each renewable energy power station in the fair dispatch of the power system, the original dispatch plan of renewable energy power stations is redistributed to obtain a fair dispatch plan for renewable energy power stations;

[0008] According to the fair dispatch plan of new energy power stations, the constraints of new energy units and the safe and stable operation constraints of the power grid are comprehensively considered to finally determine the safe dispatch plan of new energy sites.

[0009] As a further optimization scheme of the new energy power system safety dispatching method considering power flow described in the present invention, the goal of the original dispatching plan of the new energy power station is to minimize the sum of the power generation costs of the power system, and the power generation costs of the power system include the coal consumption cost of the thermal power units, the photovoltaic abandoned light cost and the wind power abandoned wind cost;

[0010] The calculation formula for the coal consumption cost of thermal power units is as follows:

[0011]

[0012] Among them, C TH,t is the coal consumption cost of thermal power units; N TH The number of thermal power units participating in the dispatch in the regional power grid; For a given k TH Output coal consumption cost coefficient of each thermal power unit; is the output of the thermal power unit at time t;

[0013] The calculation formula for the cost of photovoltaic abandonment is as follows:

[0014]

[0015] Among them, C PV,t is the cost of photovoltaic abandonment; N PV is the number of PV power stations participating in the dispatch in the regional power grid; PV is the unit cost of photovoltaic curtailment, λ PV It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing photovoltaic power generation, and the other is the loss of abandoned photovoltaic power generation; α PV is the maximum prediction error coefficient of photovoltaic output, and its value is greater than or equal to 1; For the kth PV The predicted output value of a photovoltaic cell at time t, For the kth PV The dispatch plan value of a photovoltaic at time t;

[0016] The calculation formula for the cost of wind power curtailment is as follows:

[0017]

[0018] Among them, C WT,t is the cost of wind power abandonment; N WT is the number of wind power stations participating in the dispatch in the regional power grid; WT is the unit curtailment cost of wind power, λ WT It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing wind power generation, and the other is the loss of abandoned wind power generation; α WT is the maximum prediction error coefficient of wind power output, and its value is greater than or equal to 1; For the kth WT The output forecast value of a wind farm at time t, For the kth WT The dispatch plan value of a wind farm at time t.

[0019] As a further optimization scheme of the new energy power system security dispatching method considering power flow described in the present invention, the objective function C of the original dispatching plan of the new energy power station is total The specific formula is as follows:

[0020]

[0021] Wherein, T is the scheduling time period.

[0022] As a further optimization scheme of the safe dispatching method of the new energy power system considering the power flow described in the present invention, according to the weight of each new energy power station in the fair dispatching of the power system, the original dispatching plan of the new energy power station is redistributed to obtain the fair dispatching plan of the new energy power station. The fair dispatching plan of the new energy power station is specifically as follows:

[0023] First, according to the original dispatch plan of the new energy power station and the weight of each new energy power station in the fair dispatch of the power system, the dispatch plan of the power station is preliminarily allocated:

[0024]

[0025] in, The initial fairness allocation plan calculated by the power station according to the weights; For the kth PV The kth photovoltaic WT The weight of a wind farm, is the predicted output value of the power station at time t, is the kth PV The kth photovoltaic WT The initial dispatch plan of wind farms, k PV / WT is the kth PV The kth photovoltaic WT Wind farms, N PV / WT is the number of photovoltaic or wind farms;

[0026] Secondly, the preliminary allocation plan of the power station Output forecast value of the same power station at time t In comparison, the power stations participating in the dispatch at time t are divided into two categories:

[0027] The first category is The dispatch plan finally executed by the power station at this time At the same time, the remaining consumption plan of the power grid for the power station at time t is calculated The specific calculation is:

[0028]

[0029] The second category is At this time, the power plant will be used as an intermediate dispatch plan, and the remaining power generation space of the power plant at time t is calculated. The specific calculation formula is:

[0030]

[0031] According to the number of power stations in the second category, the remaining consumption plans are redistributed according to the weights to obtain the dispatch plan adjustment quota of the power stations in the second category.

[0032]

[0033] Among them, N PV / WT-1 is the number of power stations of the first category after initial allocation, N PV / WT-2 is the number of second-category power stations after initial allocation;

[0034] Calculate the fair dispatch plan finally implemented by the second type of power station The specific calculation formula is:

[0035]

[0036] As a further optimization scheme of the new energy power system safe dispatch method considering power flow described in the present invention, the constraints of the new energy unit constraints and the safe and stable operation constraints of the power grid include:

[0037] AC power flow equation constraints:

[0038]

[0039] Among them, P TH,i,t , P PV,i,t , P WT,i,t and P LD,i,t are the active powers of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; Q TH,i,t , Q PV,i,t , Q WT,i,t and Q LD,i,t are the reactive power of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; G ij , B ij and δ ij are the conductance, reactance and phase angle between the i-th node and the j-th node, respectively, U i,t is the voltage amplitude of the ith node at the tth moment, U j,tis the voltage amplitude of the jth node at time t, n is the total number of nodes in the power system;

[0040] Output constraints of thermal power units:

[0041]

[0042] in, and The kth TH The lower and upper limits of the output of each thermal power unit;

[0043] Thermal power unit ramp rate constraints:

[0044]

[0045] in, and The kth TH Maximum upward and downward climbing power of each thermal power unit, is the output of the thermal power unit at time t-1;

[0046] Output constraints of new energy stations:

[0047]

[0048] Among them, the actual output values ​​of photovoltaic and wind power are not higher than the output forecast values;

[0049] Node voltage safety constraints:

[0050] U i,min ≤U i,t ≤U i,max i=1,2,…N ND

[0051] Among them, U i,min and U i,max are the lower and upper limits of the voltage at the ith node; U i,t is the voltage amplitude of the ith node; N ND is the number of system nodes;

[0052] N-1 safety constraint for node voltage:

[0053]

[0054] Among them, U i,min and U i,max are the lower and upper limits of the voltage at the i-th node respectively; and are the voltage amplitudes of the ith node in the base state and the oth N-1 fault event respectively; N ND is the number of nodes in the power system; N FTis the number of N-1 faults in the power system;

[0055] N-1 safety constraint on line transmission power

[0056]

[0057] Among them, P L,l,t and P L,l,max are respectively the active power and maximum transmission power transmitted by the lth line; and are the active power of the lth line in the base state and the oth N-1th fault event respectively; N L is the number of system branches, U j,t is the voltage amplitude of the jth node.

[0058] In a second aspect, a new energy power system safety dispatching device considering power flow includes:

[0059] The collection module is used to collect all data in the process of new energy power generation dispatching, including the installed capacity, power generation, and fault shutdown data of new energy stations. New energy includes photovoltaic and wind power.

[0060] The constraint module is used to store various constraint conditions in the new energy dispatch process considering the safety of the power system, and store the upper and lower limits of various constraint conditions;

[0061] The calculation module is used to calculate the comprehensive dispatching results of the new energy stations and present the comprehensive dispatching results of the new energy stations in a visual way based on all the data and various constraints in the new energy power generation dispatching process and the fair dispatching plan of the proposed new energy power stations.

[0062] In a third aspect, a computer device comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein when the processor executes the computer program, the steps of the method for safe dispatching of a new energy power system considering power flow as described in the first aspect or any corresponding embodiment thereof are implemented.

[0063] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of a method for safe dispatching of a new energy power system considering power flow as described in the first aspect above or any corresponding embodiment thereof.

[0064] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0065] (1) The present invention first considers the power generation cost of the new power system with a high proportion of new energy, then performs fair dispatch and redistribution of the dispatch plan on the dispatch model, and finally comprehensively considers the constraints of the new energy units and the safe and stable operation constraints of the power grid to determine the final dispatch result of the new energy station, so as to realize the safe and economic dispatch of the new energy power system for the new energy station, making the dispatch result more reliable and comprehensive. In addition, the final dispatch result of the present invention is presented in a numerical way, which is more accurate and intuitive.

[0066] (2) The method of the present invention aims to achieve accurate prediction and regulation of power flow by comprehensively considering the uncertainty of renewable energy generation, the volatility of power load and the physical constraints of the power grid, so as to ensure the safe and stable operation of the power system. At the same time, the method also focuses on economic optimization, by reasonably arranging the power generation output of renewable energy and traditional energy, reducing the system operation cost and improving the overall economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a schematic diagram of the steps of the new energy dispatching control method in the present invention;

[0068] Figure 2 It is a ten-machine 39-node simulation model adopted in the embodiment of the present invention;

[0069] Figure 3 It is a schematic diagram of the structure of the new energy dispatching control device in the present invention;

[0070] Figure 4 It is a schematic diagram of the structure of the computer equipment involved in the new energy dispatching control in the present invention;

[0071] Figure 5 It is a comparison between the scheduling plan of the PV1 station and the power forecast in the embodiment of the new energy scheduling control of the present invention;

[0072] Figure 6 It is a comparison between the dispatching plan of WF1 station and the power forecast in the new energy dispatching control embodiment of the present invention. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0074] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0075] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0076] Reference Figure 1 to Figure 6 , is an embodiment of the present invention, which provides a new energy power system security dispatching method considering power flow, including:

[0077] S101: For power systems with a high proportion of renewable energy, the coal consumption cost of thermal power units and the cost of wind and solar power abandonment of renewable energy power generation are considered, and the power system is dispatched to obtain the original dispatch plan of renewable energy power stations. The goal of the original dispatch plan of renewable energy power stations is to minimize the sum of the power generation costs of the power system:

[0078] The power generation cost of the proposed power system includes the coal consumption cost of thermal power units, the cost of photovoltaic power abandonment, and the cost of wind power abandonment;

[0079] The calculation formula of the coal consumption cost of the thermal power unit is as follows:

[0080]

[0081] Among them, C TH,t is the coal consumption cost of thermal power units; N TH The number of thermal power units participating in the dispatch in the regional power grid; For a given k TH Output coal consumption cost coefficient of each thermal power unit; is the output of the thermal power unit at time t.

[0082] The calculation formula for the cost of photovoltaic abandonment is as follows:

[0083]

[0084] Among them, C PV,t is the cost of photovoltaic abandonment; N PV is the number of PV power stations participating in the dispatch in the regional power grid; PV is the unit cost of photovoltaic curtailment, λ PV It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing photovoltaic power generation, and the other is the loss of abandoned photovoltaic power generation; α PV The maximum prediction error coefficient of photovoltaic output, its value is greater than or equal to 1, the closer it is to 1, the higher the prediction accuracy; For the kth PV The predicted output value of a photovoltaic cell at time t, For the kth PVThe dispatch plan value of a photovoltaic at time t.

[0085] The calculation formula for the cost of wind power curtailment is as follows:

[0086]

[0087] Among them, C WT,t is the cost of wind power abandonment; N WT is the number of wind power stations participating in the dispatch in the regional power grid; WT is the unit curtailment cost of wind power, λ WT It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing wind power generation, and the other is the loss of abandoned wind power generation; α WT is the maximum prediction error coefficient of wind power output, and its value is greater than or equal to 1. The closer it is to 1, the higher the prediction accuracy. For the kth WT The output forecast value of a wind farm at time t, For the kth WT The dispatch plan value of a wind farm at time t

[0088] The objective function C of the original dispatch plan of the new energy power station total The specific formula is as follows:

[0089]

[0090] Wherein, T is the scheduling time period.

[0091] S102: According to the weight of each new energy power station in the fair dispatch of the power system, the original dispatch plan of the new energy power station is redistributed to obtain a fair dispatch plan of the new energy power station:

[0092] Taking into account various indicators such as the equipment characteristics and output characteristics of new energy stations, allocating them according to the weights after fair game weighting can ensure that power stations with superior performance obtain more power generation plans, while power stations with poor performance obtain fewer scheduling plans. In this way, allocating scheduling plans for new energy power stations according to the comprehensive ranking priority can ensure the fairness of power generation space for power stations.

[0093] According to the weight of each new energy power station in the fair dispatch of the power system, the original dispatch plan of the new energy power station is redistributed to obtain the fair dispatch plan of the new energy power station. The specific fair dispatch plan of the new energy power station is as follows:

[0094] First, according to the original dispatch plan of the new energy power station and the weight of each new energy power station in the fair dispatch of the power system, the dispatch plan of the power station is preliminarily allocated:

[0095]

[0096] in, The initial fairness allocation plan calculated by the power station according to the weights; For the kth PV The kth photovoltaic WT The weight of a wind farm, is the predicted output value of the power station at time t, is the kth PV The kth photovoltaic WT The initial dispatch plan of wind farms, k PV / WT is the kth PV The kth photovoltaic WT Wind farms, N PV / WT is the number of photovoltaic or wind farms;

[0097] Secondly, the preliminary allocation plan of the power station The output forecast value of the same power station at time t In comparison, the power stations participating in the dispatch at time t are divided into two categories:

[0098] The first category is The dispatch plan finally executed by the power station at this time At the same time, the remaining consumption plan of the power grid for the power station at time t is calculated The specific calculation is:

[0099]

[0100] The second category is At this time, the power station will be used as an intermediate dispatch plan, and the remaining power generation space of the power station at time t is calculated. The specific calculation formula is:

[0101]

[0102] According to the number of the second type of power stations, the remaining consumption plans are redistributed according to the weights to obtain the dispatch plan adjustment quota of the power stations in the second type.

[0103]

[0104] Among them, N PV / WT-1 is the number of first-class power stations after initial allocation, N PV / WT-2 is the number of second-category power stations after initial allocation;

[0105] Calculate the fair dispatch plan finally implemented by the second type of power station The specific calculation formula is:

[0106]

[0107] S103: Based on the fair dispatch plan of the new energy power station, comprehensively consider the constraints of the new energy units and the safe and stable operation constraints of the power grid, and finally determine the safe dispatch plan of the new energy station, including:

[0108] The constraints of new energy units and safe and stable operation of the power grid include:

[0109] AC power flow equation constraints:

[0110]

[0111] Among them, P TH,i,t , P PV,i,t , P WT,i,t and P LD,i,t are the active powers of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; Q TH,i,t , Q PV,i,t , Q WT,i,t and Q LD,i,t are the reactive power of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; G ij , B ij and δ ij are the conductance, reactance and phase angle between the i-th node and the j-th node, respectively, U i,t is the voltage amplitude of the ith node at the tth moment, U j,t is the voltage amplitude of the jth node at time t, n is the total number of nodes in the power system;

[0112] Output constraints of thermal power units:

[0113]

[0114] in, and The kth TH The lower and upper limits of the output of each thermal power unit;

[0115] Thermal power unit ramp rate constraints:

[0116]

[0117] in, and The kth TH Maximum upward and downward climbing power of each thermal power unit, is the output of the thermal power unit at time t-1;

[0118] Output constraints of new energy stations:

[0119]

[0120] Among them, the actual output values ​​of photovoltaic and wind power are not higher than the output forecast values;

[0121] Node voltage safety constraints:

[0122] U i,min ≤U i,t ≤U i,max i=1,2,…N ND

[0123] Among them, U i,min and U i,max are the lower and upper limits of the voltage at the ith node; U i,t is the voltage amplitude of the ith node; N ND is the number of system nodes;

[0124] N-1 safety constraint for node voltage:

[0125]

[0126] Among them, U i,min and U i,max are the lower and upper limits of the voltage at the i-th node respectively; and are the voltage amplitudes of the ith node in the base state and the oth N-1 fault event respectively; N ND is the number of nodes in the power system; N FT is the number of N-1 faults in the power system;

[0127] N-1 safety constraint on line transmission power

[0128]

[0129] Among them, P L,l,t and P L,l,max are respectively the active power and maximum transmission power transmitted by the lth line; and are the active power of the lth line in the base state and the oth N-1th fault event respectively; N L is the number of system branches, U j,t is the voltage amplitude of the jth node.

[0130] Considering the safety of power system, the new energy dispatching control device includes:

[0131] The collection module collects all data in the process of new energy power generation dispatching, including the installed capacity, power generation, fault shutdown and other data of new energy stations (photovoltaic and wind power);

[0132] The constraint module is used to store various constraint conditions in the new energy dispatch process considering the safety and economy of the power system, and store the upper and lower limits of various constraint conditions;

[0133] The calculation module calculates the comprehensive dispatch results of the new energy station based on all the data in the new energy power generation dispatch process and various constraints, and then comprehensively considers the proposed economic and safe dispatch strategy, calculates the comprehensive dispatch results of the new energy station and presents them in a visual way.

[0134] The results of the comprehensive scheduling part are as follows Figure 5-6 shown.

[0135] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0136] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, the steps of the method for safe scheduling of a new energy power system considering power flow as described in the first aspect above or any corresponding embodiment thereof are implemented.

[0137] An embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the method for safe scheduling of a new energy power system considering power flow as described in the first aspect above or any corresponding embodiment thereof.

[0138] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0139] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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.

[0140] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0142] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0143] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for safe dispatching of a new energy power system considering power flow, characterized in that: include: For power systems with a high proportion of renewable energy, the coal consumption cost of thermal power units and the cost of wind and solar power abandonment of renewable energy power generation are considered, and the power system is dispatched to obtain the original dispatch plan of renewable energy power stations; According to the weight of each renewable energy power station in the fair dispatch of the power system, the original dispatch plan of renewable energy power stations is redistributed to obtain a fair dispatch plan for renewable energy power stations; According to the fair dispatch plan of new energy power stations, the constraints of new energy units and the safe and stable operation constraints of the power grid are comprehensively considered to finally determine the safe dispatch plan of new energy sites.

2. The method for safe dispatching of a new energy power system considering power flow as claimed in claim 1, characterized in that: The goal of the original dispatch plan of the new energy power station is to minimize the sum of the power generation costs of the power system. The power generation costs of the power system include the coal consumption costs of thermal power units, the photovoltaic power abandonment costs, and the wind power abandonment costs. The calculation formula for the coal consumption cost of thermal power units is as follows: Among them, C TH,t is the coal consumption cost of thermal power units; N TH The number of thermal power units participating in the dispatch in the regional power grid; For a given k TH Output coal consumption cost coefficient of each thermal power unit; is the output of the thermal power unit at time t; The calculation formula for the cost of photovoltaic abandonment is as follows: Among them, C PV,t is the cost of photovoltaic abandonment; N PV is the number of PV power stations participating in the dispatch in the regional power grid; PV is the unit cost of photovoltaic curtailment, λ PV It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing photovoltaic power generation, and the other is the loss of abandoned photovoltaic power generation; α PV is the maximum prediction error coefficient of photovoltaic output, and its value is greater than or equal to 1; For the kth PV The predicted output value of a photovoltaic cell at time t, For the kth PV The dispatch plan value of a photovoltaic at time t; The calculation formula for the cost of wind power curtailment is as follows: Among them, C WT,t is the cost of wind power abandonment; N WT is the number of wind power stations participating in the dispatch in the regional power grid; WT is the unit curtailment cost of wind power, λ WT It includes two parts: one is the additional environmental cost caused by coal-fired power generation replacing wind power generation, and the other is the loss of abandoned wind power generation; α WT is the maximum prediction error coefficient of wind power output, and its value is greater than or equal to 1; For the kth WT The output forecast value of a wind farm at time t, For the kth WT The dispatch plan value of a wind farm at time t.

3. The method for safe dispatching of a new energy power system considering power flow as claimed in claim 2, characterized in that: The objective function C of the original dispatch plan of the new energy power station total The specific formula is as follows: Wherein, T is the scheduling time period.

4. The method for safe dispatching of a new energy power system considering power flow as claimed in claim 1, characterized in that: According to the weight of each new energy power station in the fair dispatch of the power system, the original dispatch plan of the new energy power station is redistributed to obtain the fair dispatch plan of the new energy power station. The specific fair dispatch plan of the new energy power station is as follows: First, according to the original dispatch plan of the new energy power station and the weight of each new energy power station in the fair dispatch of the power system, the dispatch plan of the power station is preliminarily allocated: in, The initial fairness allocation plan calculated by the power station according to the weights; For the kth PV The kth photovoltaic WT The weight of a wind farm, is the predicted output value of the power station at time t, is the kth PV The kth photovoltaic WT The initial dispatch plan of wind farms, k PV / WT is the kth PV The kth photovoltaic WT Wind farms, N PV / WT is the number of photovoltaic or wind farms; Secondly, the preliminary allocation plan of the power station The output forecast value of the same power station at time t In comparison, the power stations participating in the dispatch at time t are divided into two categories: The first category is The dispatch plan finally executed by the power station at this time At the same time, the remaining consumption plan of the power grid for the power station at time t is calculated The specific calculation is: The second category is At this time, the power station will be used as an intermediate dispatch plan, and the remaining power generation space of the power station at time t is calculated. The specific calculation formula is: According to the number of the second type of power stations, the remaining consumption plans are redistributed according to the weights to obtain the dispatch plan adjustment quota of the power stations in the second type. Among them, N PV / WT-1 is the number of power stations of the first category after initial allocation, N PV / WT-2 is the number of second-category power stations after initial allocation; Calculate the fair dispatch plan finally implemented by the second type of power station The specific calculation formula is:

5. The method for safe dispatching of a new energy power system considering power flow as claimed in claim 2, characterized in that: The constraints of new energy units and safe and stable operation of the power grid include: AC power flow equation constraints: Among them, P TH,i,t , P PV,i,t , P WT,i,t and P LD,i,t are the active powers of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; Q TH,i,t , Q PV,i,t , Q WT,i,t and Q LD,i,t are the reactive power of thermal power, photovoltaic power, wind power and load of the i-th node at the t-th moment; G ij , B ij and δ ij are the conductance, reactance and phase angle between the i-th node and the j-th node, respectively, U i,t is the voltage amplitude of the ith node at the tth moment, U j,t is the voltage amplitude of the jth node at time t, n is the total number of nodes in the power system; Output constraints of thermal power units: in, and The kth TH The lower and upper limits of the output of each thermal power unit; Thermal power unit ramp rate constraints: in, and The kth TH Maximum upward and downward climbing power of each thermal power unit, is the output of the thermal power unit at time t-1; Output constraints of new energy stations: Among them, the actual output values ​​of photovoltaic and wind power are not higher than the output forecast values; Node voltage safety constraints: U i,min ≤U i,t ≤U i,max i=1,2,…N ND Among them, U i,min and U i,max are the lower and upper limits of the voltage at the ith node; U i,t is the voltage amplitude of the ith node; N ND is the number of system nodes; N-1 safety constraint for node voltage: Among them, U i,min and U i,max are the lower and upper limits of the voltage at the i-th node respectively; and are the voltage amplitudes of the ith node in the base state and the oth N-1 fault event respectively; N ND is the number of nodes in the power system; N FT is the number of N-1 faults in the power system; N-1 safety constraint on line transmission power Among them, P L,l,t and P L,l,max are respectively the active power and maximum transmission power transmitted by the lth line; and are the active power of the lth line in the base state and the oth N-1th fault event respectively; N L is the number of system branches, U j,t is the voltage amplitude of the jth node.

6. A new energy power system safety dispatching device considering power flow, characterized in that: include: The collection module is used to collect all data in the process of new energy power generation dispatching, including the installed capacity, power generation, and fault shutdown data of new energy stations. New energy includes photovoltaic and wind power. The constraint module is used to store various constraint conditions in the new energy dispatch process considering the safety of the power system, and store the upper and lower limits of various constraint conditions; The calculation module is used to calculate the comprehensive dispatching results of the new energy stations and present the comprehensive dispatching results of the new energy stations in a visual way based on all the data and various constraints in the new energy power generation dispatching process and the fair dispatching plan of the proposed new energy power stations.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the computer program, the steps of the method for safe dispatching of a new energy power system considering power flow as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for safe dispatching of a new energy power system considering power flow as described in any one of claims 1 to 5 are implemented.

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