Source-network collaborative planning method and device, storage medium and computer equipment

Abstract

The invention relates to the technical field of power systems, and discloses a source-network collaborative planning method and device, a storage medium and computer equipment. The method comprises the steps of determining planning information of a power grid based on a source network collaborative planning model according to to-be-built information of the power grid; updating the topological structure of the power grid according to the planning information; calculating a short-circuit current of a bus node in the updated topological structure of the power grid, and calculating a short-circuit ratio at a direct-current grid-connected point in grid-connected points corresponding to a generator set in the updated topological structure of the power grid; and according to the short-circuit ratio of the short-circuit current of the bus node to the direct-current grid-connected point, correcting the planning information, and determining target planning information. On the premise of ensuring economical efficiency, the short-circuit current and the short-circuit ratio of the system are ensured to be within allowable ranges by reasonably adjusting lines, the power grid strength is considered while the safety of the short-circuit current of the system is ensured, and the method is more in line with the development trend of a receiving end system in the future.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a source-network collaborative planning method, device, storage medium and computer equipment. Background Art

[0002] Traditional source-grid collaborative planning mainly focuses on the generation, transmission and distribution of electricity to meet the power needs of users while ensuring the economy and reliability of the system. With the development of the economy and the increase in power capacity, the number of transmission lines has increased, the equivalent electrical distance of the transmission system has continued to decrease, and the large-scale grid connection of ultra-high voltage direct current outside the superimposed area has made the short-circuit current and short-circuit ratio of the receiving system increasingly serious. In the relevant technology, there is still a lack of research on considering the short-circuit current and short-circuit ratio constraints of the receiving system in the source-grid collaborative planning. Summary of the invention

[0003] In view of this, the present application provides a source-network collaborative planning method, device, storage medium and computer equipment, which, under the premise of ensuring economy, makes the system short-circuit current and short-circuit ratio within the allowable range, ensures the stable operation of the planned power grid, and improves the effectiveness of the planning.

[0004] According to one aspect of the present application, a source-network collaborative planning method is provided, comprising: determining the planning information of the power grid according to the information of the power grid to be built and based on a source-network collaborative planning model; wherein the source-network collaborative planning model includes a target planning function with the goal of minimizing the total planning cost of the power grid and operating constraints of the power grid; updating the topology of the power grid according to the planning information; calculating the short-circuit current of the bus node in the updated topology of the power grid, and calculating the short-circuit ratio at the DC grid connection point in the grid connection point corresponding to the generator set in the updated topology of the power grid; and correcting the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information.

[0005] According to another aspect of the present application, a source-network collaborative planning device is provided, comprising: a determination module, used to determine the planning information of the power grid according to the information of the power grid to be built and based on a source-network collaborative planning model; wherein the source-network collaborative planning model includes a target planning function with the goal of minimizing the total planning cost of the power grid and operating constraints of the power grid; an update module, used to update the topology of the power grid according to the planning information; a calculation module, used to calculate the short-circuit current of the bus node in the updated topology of the power grid, and calculate the short-circuit ratio at the DC grid connection point in the grid connection point corresponding to the generator set in the updated topology of the power grid; and a correction module, used to correct the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information.

[0006] According to another aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the above-mentioned source network collaborative planning method are implemented.

[0007] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, and the processor implements the steps of the above-mentioned source network collaborative planning method when executing the program.

[0008] By means of the above technical scheme, the present application provides a source-network collaborative planning method, device, storage medium and computer equipment. According to the target planning function with the minimum total planning cost of the power grid as the goal, a source-network collaborative planning model is pre-constructed with the operating constraints of the power grid, and the planning information corresponding to the information to be built of the power grid is obtained based on the source-network collaborative planning model. Further calculate the short-circuit current of each bus node in the power grid planned according to the planning information and the short-circuit ratio at the DC grid connection point in the grid connection point corresponding to the generator set. By correcting the planning information, the system short-circuit current and short-circuit ratio are both within the allowable range, so that under the premise of ensuring economy, the short-circuit current safety and the strength of the power grid are taken into account, the stable operation of the planned power grid is ensured, the effectiveness of the planning is improved, and it is more in line with the development trend of the receiving end system in the future.

[0009] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0011] Figure 1 A schematic diagram of a process flow of a source network collaborative planning method provided in an embodiment of the present application is shown;

[0012] Figure 2 A structural block diagram of a source network collaborative planning device provided in an embodiment of the present application is shown;

[0013] Figure 3 A block diagram of a voltage source converter high voltage direct current transmission based on a constant reactive power constant direct current voltage control method provided in an embodiment of the present application is shown;

[0014] Figure 4 A schematic diagram of a power transmission network test structure provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0015] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0016] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0017] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, or there may be intermediate elements. In addition, the "connection" or "connection" used herein may include wireless connection or wireless fusion. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0018] The source network collaborative planning method provided in the embodiment of the present application can be applied to the terminal, can also be applied to the server, and can also be software running in the terminal or the server. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or a server cluster or distributed system composed of multiple physical servers, and can also be configured as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application that implements the source network collaborative planning method, etc., but is not limited to the above forms.

[0019] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art.

[0020] In this embodiment, a source network collaborative planning method is provided, such as Figure 1 As shown, the method includes:

[0021] Step 101, according to the information of the power grid to be built and based on the source network collaborative planning model, determine the planning information of the power grid.

[0022] Among them, the source-grid collaborative planning model includes the target planning function with the goal of minimizing the total planning cost of the power grid and the operating constraints of the power grid.

[0023] In this embodiment, according to the parameter data of the power grid and the information of the power grid to be built, based on the pre-built source-network collaborative planning model, preliminary planning information of the power grid is obtained to provide a basis for subsequent planning.

[0024] Exemplarily, the information to be built of the power grid may include the type and capacity of the generator set to be built, and which bus nodes of the power grid are incorporated into the UHV DC system, so as to clarify the power supply to be built and the input method of the power supply. The parameter data of the power grid includes at least load data, generator set output data, power supply data, transmission network data, and high-voltage DC data. The load data is the load size of each bus node in the power grid. The output data of the generator set is the active power of wind power, photovoltaic and other generator sets at each moment. The power supply data includes parameters such as the installed capacity of the unit, the upper and lower limits of the output, and the state of the unit. The transmission network data includes parameters such as the transmission network topology, line length, line admittance, and line capacity. The high-voltage DC data includes parameters such as the high-voltage DC topology and control method. In addition, the parameter data of the power grid can be presented in a standard format that can be called by the program to facilitate data calculation.

[0025] Furthermore, according to the parameter data and information to be built of the power grid, the YALMIP toolkit and Gurobi solver are used to solve the source-grid collaborative planning model and obtain the planning information of the power grid, which includes power source planning information, line planning information, generator output, and load planning information.

[0026] Specifically, the power planning information is used to reflect which generators to be built in the to-be-built information need to be planned into the power grid, as well as the grid connection points corresponding to the newly added generators in the power grid, etc. The line planning information is used to reflect which bus nodes in the power grid need new lines, which bus nodes need to disconnect lines, and the number of new lines, the number of disconnected lines, etc. The generator output and load planning information is used to reflect the output and load data of the generators at each moment in typical scenarios.

[0027] In one embodiment, a source-network collaborative planning model is established by considering economic needs and static safety needs. The objective function of the source-network collaborative planning model is to minimize the total planning cost, as shown in formula (1). The total planning cost is the sum of the investment and construction cost and the operating cost. Exemplarily, in this embodiment, the generator set includes a thermal power unit, a wind turbine unit and a photovoltaic unit. The wind turbine unit and the photovoltaic unit can be collectively referred to as a new energy cluster.

[0028] min C overall =C coal +C wind +C pv +C l +C ope (1)

[0029] Among them, C overall is the total planning cost, C coal The construction cost of thermal power units, C wind is the construction cost of wind turbines, C pv is the construction cost of the photovoltaic unit, C l is the line construction cost, C ope For running costs.

[0030] Furthermore, the investment and construction costs in formula (1) are specifically shown in formulas (2)-(5).

[0031]

[0032]

[0033] Among them, C c is the unit capacity investment and construction cost of thermal power units, is the capacity of the thermal power unit to be built, is the decision variable for construction of thermal power units, C is the collection of thermal power units to be built; w is the unit capacity investment and construction cost of wind turbines, is the capacity of the wind turbine to be built, is the decision variable for wind turbine construction. is the set of wind turbines to be built; C pv is the unit capacity investment and construction cost of the photovoltaic unit, is the capacity of the photovoltaic unit to be built, is the decision variable for the construction of photovoltaic units, C is the collection of photovoltaic units to be built; l is the construction cost per unit length of the line, L l is the length of the line to be built, λ l is the line construction decision variable, A collection of lines to be built.

[0034] It should be noted that the decision variables for the construction of thermal power units are Decision variables for wind turbine construction Decision variables for investment and construction of photovoltaic units Line construction decision variable λ l It is the variable that needs to be solved in the model, which is used to obtain the power supply planning information and line planning information.

[0035] Furthermore, the operating cost C in formula (1) ope As shown in formulas (6)-(11).

[0036] C ope =C fuel +C w_cut +C pv_cut +C load_cut +C start (6)

[0037]

[0038]

[0039] Among them, C fuel is the fuel cost, C w_cut is the wind curtailment cost, C pv _ cut is the cost of abandoned light, C load_cut is the load shedding cost, C start is the start-up and shutdown cost of the generator set. f is the unit fuel cost, p g,ρ,t is the active output of generator g at time t in scenario ρ, C wc is the unit wind curtailment cost, is the energy abandonment of generator g at time t in scenario ρ, C pvc is the unit abandoned light cost, C bc is the unit load shedding cost, is the load shedding size of bus node b at time t in scenario ρ, is the decision variable for the generator g to start the action at time t in scenario ρ, is the starting cost of generator set g. is the set of all wind turbines in the grid, is the collection of all photovoltaic units in the grid, is the set of all thermal power units in the power grid, is the set of all bus nodes in the power grid, is a set of typical daily load, wind power output, and photovoltaic output scenarios, and T is a set of moments in each scenario.

[0040] It should be noted that the active output p g,ρ,t , Abandoned energy size Start action decision variable It is the variable that needs to be solved in the model, used to obtain the generator output and load planning information.

[0041] In this embodiment, the source-grid collaborative planning model also includes node power balance constraints, thermal power unit output constraints, thermal power unit start-up and shutdown logic constraints, thermal power unit climbing constraints, load shedding constraints, energy abandonment constraints, system rotating reserve constraints, system total reserve constraints, line flow constraints and other power grid operation constraints to ensure the stable operation of the power grid.

[0042] Specifically, the node power balance constraint is shown in formula (12). The left side of formula (12) is the output of the generator set at the bus node b minus the wind and solar energy abandonment plus the power flow injected into the bus node b. The right side of formula (12) is the load size at the bus node b minus the load shedding size.

[0043]

[0044] in, is the set of all generator sets at bus node b, is the wind turbine set at bus node b, is the photovoltaic unit set at bus node b, is the set of all lines in the power grid, is the busbar node b-line l association matrix element, f l,ρ,t is the power flow size of line l at time t in scenario ρ, d b,ρ,t is the load size at bus node b at time t in scenario ρ.

[0045] The output constraint of thermal power units is shown in formula (13). The first formula in formula (13) is the upper and lower limit constraints of the thermal power unit output, the second formula is the set expression of the thermal power unit, and the third formula is the logical relationship between the thermal power unit operation state decision variable and the thermal power unit investment decision variable.

[0046]

[0047] In the formula, v g,ρ, t is the operating state decision variable of the generator set g at time t in scenario ρ, which is used to indicate whether the generator set is in operating state or stopped state. g,m i n is the minimum output of the generator set, p g,max Maximum output of the generator set.

[0048] The start-up and shutdown logic constraints of thermal power units are shown in formula (14). The first and second formulas in formula (14) are the logic constraints of the decision variables of the start-up and shutdown actions, the third and fourth formulas are the minimum start-up time constraints, and the fifth and sixth formulas are the minimum shutdown time constraints.

[0049]

[0050] Among them, v g,ρ,t-1 is the operating state decision variable of generator set g at time t-1 in scenario ρ, is the shutdown action decision variable of generator set g at time t in scenario ρ, UT g is the minimum startup time, DT g is the minimum downtime, T g,u is the startup duration of the generator set g at the initial moment, T g,d is the shutdown duration of generator set g at the initial moment, T N The total time.

[0051] The climbing constraint of the thermal power unit is shown in formula (15). The first formula in formula (15) is the climbing constraint, and the second formula is the downhill constraint.

[0052]

[0053] Among them, ξ g,up is the maximum climbing power of the generator set g, ξ g,down is the maximum downhill power of generator set g.

[0054] The load shedding constraint is shown in equation (16), and the energy abandonment constraint is shown in equation (17). The two equations in equation (17) are wind and solar energy abandonment constraints, respectively.

[0055]

[0056] Among them, β w is the maximum wind power abandonment coefficient, β pv is the maximum abandoned light power coefficient.

[0057] The system spinning reserve constraint is shown in formula (18). The left side of formula (18) is the sum of the installed capacity of thermal power plants in operation and the predicted output of wind and solar power, and the right side of formula (18) is the required spinning reserve capacity of the system.

[0058]

[0059] Wherein, γ is the spinning reserve coefficient.

[0060] The total reserve constraint of the system is shown in formula (19). The left side of formula (19) is the sum of the installed capacity of all thermal power plants and the reliable capacity of wind and solar power, and the right side of formula (19) is the total reserve capacity required by the system.

[0061]

[0062] Among them, δ is the total reserve coefficient of the system, τ is the wind and solar reliability, τ = 10%, d max For maximum load.

[0063] The line flow constraint is shown in formula (20). The first formula in formula (20) is the flow calculation method, and the second formula is the flow upper and lower limit constraints.

[0064]

[0065] Among them, B l is the line admittance, θ fr(l),ρ,t is the starting phase of line l at time t in scenario ρ, θ to(l),ρ,t is the terminal phase of line l at time t in scenario ρ, F l max The upper limit of the line capacity.

[0066] It should be noted that the running state decision variable v g,ρ,t , start action decision variable Shutdown action decision variables Starting point phase θ fr(l),ρ,t , end point phase θ to(l),ρ,t It is the variable that needs to be solved in the model, used to obtain the generator output and load planning information.

[0067] The solution accuracy of the source network collaborative planning model can be set to 0.5%.

[0068] Step 102: Update the topology of the power grid according to the planning information.

[0069] In this embodiment, the power grid is planned according to the planning information obtained in step 101, and the topology of the power grid is updated according to the planning information to obtain the planned power grid, providing basic data for subsequent calculation of the short-circuit current and short-circuit ratio of the planned power grid.

[0070] Step 103, calculating the short-circuit current of the busbar node in the updated topological structure of the power grid, and calculating the short-circuit ratio at the DC grid connection point in the grid connection points corresponding to the generator sets in the updated topological structure of the power grid.

[0071] In this embodiment, the short-circuit current and the short-circuit ratio of the planned power grid are calculated to provide accurate objects for subsequent verification of whether the short-circuit current and the short-circuit ratio of the system meet the requirements.

[0072] It should be noted that the grid connection point corresponding to the generator set is the physical connection point between the generator set as a power source and the power grid, and the grid connection point corresponding to the generator set determines the channel for the generator set to transmit electric energy to the power grid. Among them, the grid connection points corresponding to the generator set in this embodiment include the new energy cluster grid connection point and the DC grid connection point. The DC grid connection point is the inverter station converter bus of the DC system corresponding to the DC grid connection point. The DC grid connection point includes the line-commutated converter ultra-high voltage DC grid connection point and the voltage source converter ultra-high voltage DC grid connection point.

[0073] Further, as a refinement and extension of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the step of calculating the short-circuit current of the bus node in the topological structure of the updated power grid specifically includes: determining the target self-impedance of the bus node in the updated power grid according to the planning information, the initial self-impedance of the bus node in the power grid before this update, and the mutual impedance between the bus nodes in the power grid before this update; with the short-circuit current of the bus node being less than or equal to the maximum short-circuit current of the bus node as a constraint, determining the short-circuit current of the bus node in the updated power grid according to the target self-impedance of the bus node, the equivalent current at the grid connection point corresponding to the generator set, and the mutual impedance between the grid connection point corresponding to the generator set and the bus node in the updated power grid.

[0074] In this embodiment, the impact of the adjustment of power sources and lines in the comprehensive planning information on the power grid is calculated, and the short-circuit current of each bus node in the power grid planned according to the planning information is recalculated to reflect the most realistic operating status of the planned power grid.

[0075] Specifically, according to the line planning information in the planning information, it can be obtained between which two bus nodes in the power grid a new line is built and between which two bus nodes a line is disconnected.

[0076] For example, if a new line is built between bus nodes k and m in the power grid, it can be regarded as adding an impedance of z between bus nodes k and m. km The change of the line structure in the power grid will cause the impedance matrix to change. Therefore, the self-impedance of each bus node in the power grid after the line structure changes is calculated according to formula (21).

[0077]

[0078] in, is the target self-impedance of busbar node i in the updated power grid, Z ii is the self-impedance of busbar node i in the power grid before this update, Z ik is the mutual impedance between bus node i and bus node k in the power grid before this update, Z im is the mutual impedance between bus node i and bus node m in the power grid before this update, Zkk is the self-impedance of busbar node k in the power grid before this update, Z mm is the self-impedance of busbar node m in the power grid before this update, Z km is the mutual impedance between bus node k and bus node m in the power grid before this update.

[0079] For example, if the line between bus node k and bus node m in the power grid is disconnected, it can be regarded as adding an impedance of -z between bus node k and bus node m. km The change of the line structure in the power grid will cause the impedance matrix to change. Therefore, the self-impedance of each bus node in the power grid after the line structure changes is calculated according to formula (22).

[0080]

[0081] Understandably, Z ii , Z kk , Z mm are diagonal elements in the impedance matrix, Z ik , Z im , Z km They are all non-diagonal elements in the impedance matrix.

[0082] Furthermore, on the basis of considering the change of the grid line structure, the short-circuit current of each bus node in the updated grid is calculated in combination with the impact of the change of the power supply on the grid.

[0083] For example, based on the power planning information in the planning information, it is possible to obtain which generator sets are newly added to the power grid and the input method of the newly added generator sets, thereby obtaining all grid connection points corresponding to the generator sets in the updated power grid.

[0084] For example, the short-circuit current of each bus node in the updated power grid is calculated according to formula (23). In formula (23), the left side is the short-circuit current size considering the line structure, new energy cluster and UHV DC grid connection under the per-unit value, and the right side of the inequality is the maximum allowable short-circuit current.

[0085]

[0086] Among them, I sc(i) is the short-circuit current of busbar node i in the updated power grid, It is a collection of grid connection points for new energy clusters. It is the collection of UHV DC grid connection points for line-commutated converters. is the voltage source converter UHV DC grid connection point set, I Vdc,v is the equivalent current source size at the renewable energy grid connection point v, I Ldc,ois the equivalent current source size at the UHV DC grid connection point o of the line-commutated converter, I Vdc,p is the equivalent current source size at the voltage source converter UHV DC grid connection point p, Z vi , Z oi , Z pi are all elements in the system impedance matrix, Z vi is the mutual impedance between the new energy grid connection point v and the updated busbar node i in the grid, Z oi is the mutual impedance between the line-commutated converter UHV DC grid connection point o and the updated bus node i in the grid, Z pi The mutual impedance between the voltage source converter UHV DC grid connection point p and the bus node i in the updated power grid.

[0087] Furthermore, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiments, in order to fully illustrate the specific implementation process of this embodiment, the source-grid collaborative planning method also includes: if the grid connection point corresponding to the generator set is a preset type of grid connection point, then the equivalent current at the grid connection point corresponding to the newly built unit is determined based on the d-axis current reference value and the q-axis current reference value at the grid connection point corresponding to the generator set.

[0088] Among them, in response to the normal operation instruction of the grid connection point corresponding to the generator set, the d-axis current reference value at the grid connection point corresponding to the generator set is determined according to the rated current at the grid connection point corresponding to the generator set, and the q-axis current reference value at the grid connection point corresponding to the generator set is determined to be 0; in response to the abnormal operation instruction of the grid connection point corresponding to the generator set, the d-axis current reference value and the q-axis current reference value at the grid connection point corresponding to the generator set are determined according to the voltage at the grid connection point corresponding to the generator set.

[0089] In this embodiment, the equivalent current at the DC grid connection point is determined according to the specific type of the DC grid connection point to accurately evaluate the impact of different types of DC grid connection points on the power grid. It should be noted that the preset types of grid connection points are voltage source converter ultra-high voltage DC grid connection points and new energy cluster grid connection points.

[0090] Specifically, the line-commutated converter UHV DC grid connection can be regarded as adding a value of I at the grid connection point o. Ldc,o The equivalent current source size at the voltage source converter UHV DC grid connection point and the new energy cluster grid connection point is affected by the control method, such as Figure 3As shown, taking the constant reactive power constant DC voltage control mode as an example, under normal circumstances, the d-axis and q-axis current reference values ​​at the UHV DC grid-connected point of the voltage source converter or the grid-connected point of the new energy cluster are calculated by voltage and power, and then enter the control of the current inner loop to obtain the gate signal for controlling the converter switch. At this time, the d-axis current reference value at the UHV DC grid-connected point of the voltage source converter or the grid-connected point of the new energy cluster is equal to the rated current, and the q-axis current reference value is 0. After the fault, since the system needs to have a certain low voltage ride-through capability, the outer control loop is not locked at this time, and the inner control loop determines the d-axis and q-axis current reference values ​​at the UHV DC grid-connected point of the voltage source converter or the grid-connected point of the new energy cluster according to the voltage at this time.

[0091] Exemplarily, after a fault, the d-axis current reference value and the q-axis current reference value at the voltage source converter UHV DC grid connection point or the new energy cluster grid connection point are as shown in formula (24).

[0092]

[0093] in, is the q-axis current reference value at the UHV DC grid connection point of the voltage source converter or the grid connection point of the new energy cluster under fault conditions, is the maximum current value at the voltage source converter UHV DC grid connection point or the new energy cluster grid connection point, U T is the voltage at the UHV DC grid connection point of the voltage source converter or the grid connection point of the new energy cluster in the event of a fault. is the d-axis current reference value at the UHV DC grid connection point of the voltage source converter or the grid connection point of the new energy cluster under fault conditions, It is the reference value of the d-axis current at the UHV DC grid-connected point of the voltage source converter or the grid-connected point of the new energy cluster under normal circumstances.

[0094] It is worth mentioning that the control system based on power electronic equipment has fast follow-up performance. Whether in normal or fault conditions, the actual d-axis and q-axis currents at the voltage source converter UHV DC grid connection point or the new energy cluster grid connection point can be made consistent with the d-axis and q-axis current reference values ​​by controlling the inner loop and the outer loop. Therefore, the equivalent current source I Vdc,r As shown in formula (25).

[0095]

[0096] Among them, I Vdc,r is the equivalent current at the voltage source converter UHV DC grid connection point r or the new energy cluster grid connection point r, The d-axis current reference value under normal conditions Or d-axis current reference value in case of fault is the reference value of q-axis current under normal conditions Or q-axis current reference value in case of fault

[0097] Further, as a refinement and extension of the specific implementation methods of the above-mentioned embodiments, in order to fully illustrate the specific implementation process of this embodiment, the step of calculating the short-circuit ratio at the DC grid-connected point in the grid-connected point corresponding to the generator set in the topology structure of the updated power grid specifically includes: determining the correction amount of the Jacobian matrix in the steady-state power flow equation of the AC system connected to the DC grid-connected point according to the type of converter corresponding to the DC grid-connected point and the control method of the converter; determining the multi-input influence factor corresponding to the DC grid-connected point according to the correction amount; determining the short-circuit ratio at the DC grid-connected point according to the multi-input influence factor corresponding to the DC grid-connected point, the rated capacity of the DC system corresponding to the DC grid-connected point, and the short-circuit capacity of the AC system connected to the DC grid-connected point.

[0098] In this embodiment, the short-circuit ratio at each DC grid connection point in the updated power grid is calculated to reflect the voltage support capability of the planned power grid and the capability of maintaining voltage stability in the event of a fault.

[0099] Exemplarily, calculations are performed based on the definition of the multi-infeed short-circuit ratio to evaluate the interaction between the various DC systems in the planned power grid and to quantify the relative strength of the AC system, as shown in equation (26).

[0100]

[0101] Among them, MISCR x is the short-circuit ratio at the DC grid connection point x, is the short-circuit capacity of the AC system connected to the DC grid-connected point x, that is, the short-circuit capacity of the AC system of the inverter station commutation bus of the DC system corresponding to the DC grid-connected point x, is the rated capacity of the DC system corresponding to the DC grid connection point x, is the DC grid-connected point y in the updated power grid except the DC grid-connected point x, F MIIFxy is the multi-infeed impact factor between DC grid connection point x and DC grid connection point y.

[0102] It should be noted that, since the power grid is updated according to the planning information, it is necessary to calculate the multi-feed impact factor of each DC grid connection point in the updated power grid to accurately reflect the interaction between each DC system in the updated power grid.

[0103] Specifically, PQ decoupling is performed on the AC system before updating to obtain the steady-state power flow equation of the AC system before updating, as shown in formula (27).

[0104]

[0105] Among them, ΔP and ΔQ are the correction vectors of the AC bus active power and reactive power respectively; Δδ and ΔU are the correction vectors of the AC bus voltage phase angle and amplitude respectively; J Pδ , J PU , J Qδ , J QU The Jacobian matrix J is divided into 4 corresponding sub-matrices.

[0106] When the DC system sends power to the AC system, the Jacobian matrix J of the AC system needs to be corrected. Since the power delivered by the DC system has nothing to do with the phase angle of the AC system, J Pδ and J Qδ Keep it the same, J PU and J QU After correction, it becomes J' PU and J' QU After correction, the steady-state power flow equation of the multi-infeed system is expressed as:

[0107]

[0108] The power of the converter station is only affected by the voltage amplitude of the converter bus. Therefore, after the DC system is connected, the impact on the Jacobian matrix J is manifested in J PU and J QU If there is a DC grid connection point x, that is, the inverter station commutation bus x, then J PU and J QU The corresponding diagonal elements in (J PU ) xx and (J QU ) xx Modified to:

[0109]

[0110] Where: Q dcx is the reactive power at the DC grid connection point x, that is, the reactive power fed into the AC system by the inverter station commutation bus x, P dcx is the active power at the DC grid connection point x, that is, the active power fed into the AC system by the inverter station commutation bus x, U x is the voltage amplitude at the DC grid-connected point x, that is, the voltage amplitude of the inverter station commutation bus x.

[0111] According to the meaning of the multi-infeed impact factor, that is, the multi-infeed impact factor F MIIFxy It represents the ratio of the voltage drop rate at the DC grid-connected point x to the voltage drop rate at other DC grid-connected points y due to reactive power disturbance. The multi-infeed impact factor can be expressed as:

[0112]

[0113] According to the meaning of the multi-feed influencing factor, if only the reactive power at the DC grid connection point y is changed to make its voltage change, the reactive power at other DC grid connection points w will remain basically unchanged, that is, ΔQ w =0(w=1,2,…,n;w≠y), n is the total number of DC grid-connected points. Therefore, formula (31) can be simplified as:

[0114]

[0115] in, is the matrix J R Find the inverse xy element, is the matrix J R Find the inverse element of yy.

[0116] From the above formula, it can be seen that the multi-input impact factor is related to the Jacobian matrix elements.

[0117] Therefore, we first need to calculate the and That is, the correction amount, and then according to the obtained and The diagonal element J' in the modified Jacobian matrix J is obtained by equations (29) and (30): QU and J' PU , then the multi-infeed impact factor is obtained according to equations (32)-(33), and finally the short-circuit ratio at each DC grid connection point in the updated power grid is obtained according to equation (26).

[0118] Further, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, the step of determining the correction amount of the Jacobian matrix in the steady-state power flow equation of the AC system to which the DC grid-connected point is connected, according to the type of converter corresponding to the DC grid-connected point and the control mode of the converter, specifically includes: if the type of the converter corresponding to the DC grid-connected point is a line-commutated converter, then the correction amount is determined according to the parameter data associated with the converter corresponding to the DC grid-connected point, the DC voltage at the DC grid-connected point, the no-load voltage of the DC side at the DC grid-connected point, and the DC current at the DC grid-connected point; if the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a droop control mode, then the correction amount is determined according to the voltage droop control coefficient of the DC grid-connected point; if the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a mode other than the droop control mode, then the correction amount is determined to be 0.

[0119] In this embodiment, according to different converters corresponding to the DC grid connection points and different control modes of the converters, corresponding correction amounts are calculated in a targeted manner to improve the accuracy of the calculation so as to accurately reflect the performance of the updated power grid.

[0120] For example, for the line-commutated converter ultra-high voltage direct current grid-connected point, if the line-commutated converter adopts a constant current / fixed arc extinction angle control method, the correction amount is calculated according to formula (34).

[0121]

[0122] If the line-commutated converter adopts a constant power / fixed arc extinction angle control method, the correction amount is calculated according to formula (35).

[0123]

[0124] If the line-commutated converter adopts a constant current / constant voltage control method, the correction amount is calculated according to formula (36).

[0125]

[0126] Among them, K x is the commutation coefficient of the converter station at the DC grid connection point x, T x is the transformer ratio of the DC grid-connected point x, I dx is the DC current at the DC grid connection point x, is the DC voltage at the DC grid connection point x, U d0x is the no-load voltage of the DC side at the DC grid connection point x, γ x is the arc extinction angle of the inverter station at the DC grid connection point i, R l is the DC line resistance.

[0127] For the voltage source converter UHV DC grid connection point, if the voltage source converter adopts a traditional control method other than the droop control method, such as a constant reactive power and constant DC voltage control method, the correction amount is calculated according to formula (37).

[0128]

[0129] If the voltage source converter adopts droop control, the correction value is calculated according to formula (38).

[0130]

[0131] Among them, D n is the voltage droop control coefficient, and U is the allowable DC voltage variation.

[0132] Step 104, modifying the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point, and determining the target planning information.

[0133] In this embodiment, in the source network planning, the constraints of short-circuit current and short-circuit ratio are considered to ensure the safety and reliability of the planned power grid and improve the effectiveness of the source network planning.

[0134] Further, as a refinement and extension of the specific implementation methods of the above-mentioned embodiment, in order to fully illustrate the specific implementation process of this embodiment, step 104, that is, the step of correcting the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point to determine the target planning information, specifically includes: if the short-circuit current of the bus node or the short-circuit ratio at the DC grid-connected point does not meet the preset conditions, then the line planning information in the planning information is updated, and the updated line planning information is input into the source network collaborative planning model, and the planning information is re-determined until the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions; if the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions, then the planning information corresponding to the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point that meet the preset conditions is determined as the target planning information.

[0135] In this example, the line planning information in the planning information is changed to adjust the line structure in the power grid, thereby changing the impedance matrix of the entire system, thereby adjusting the system short-circuit current and short-circuit ratio so that both the system short-circuit current and short-circuit ratio meet the constraints.

[0136] Exemplarily, the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point are compared with the corresponding conditions in the preset conditions. If the short-circuit current of the bus node or the short-circuit ratio at the DC grid-connected point does not meet the corresponding conditions, the line planning information in the planning information is updated to increase the constraints on the lines in the power grid, and the updated line planning information is input into the source-network collaborative planning model to add line constraints in the source-network collaborative planning model, so that the source-network collaborative planning model regenerates the planning information according to the added line constraints, and iterates in a cycle until the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions.

[0137] Furthermore, if after a certain iteration, in the power grid planned according to the planning information, the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions, then the planning information corresponding to the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point that meets the preset conditions is determined as the target planning information.

[0138] Furthermore, as a refinement and expansion of the specific implementation methods of the above-mentioned embodiments, in order to fully illustrate the specific implementation process of this embodiment, if the short-circuit current of the bus node or the short-circuit ratio at the DC grid-connected point does not meet the preset conditions, the step of updating the line planning information in the planning information specifically includes: if the short-circuit current of the bus node is greater than the first preset threshold, the number of disconnected lines in the line planning information is increased according to the preset number to update the line planning information; if the short-circuit ratio at the DC grid-connected point is less than the second preset threshold, the number of newly created lines in the line planning information is increased according to the preset number to update the line planning information.

[0139] In this example, in order to ensure the safe and stable operation of the planned power grid, the short-circuit current of the bus node in the planned power grid should not be too large, and the short-circuit ratio at the DC grid connection point should not be too small. Therefore, if the short-circuit current and the short-circuit ratio exceed their respective limit ranges, the network structure of the entire system is changed by changing the number of new lines and the number of disconnected lines in the planning information, so that the short-circuit current and the short-circuit ratio are both within the allowable range.

[0140] Exemplarily, if the short-circuit current of the bus node is greater than the first preset threshold, the line break constraint is added, that is, the number of disconnected lines is increased to increase the self-impedance of each bus node, thereby reducing the short-circuit current of each bus node. The line break constraint is added as shown in formula (39).

[0141] If the short-circuit ratio at the DC grid-connected point is less than the second preset threshold, new line constraints are added, that is, the number of new lines is increased to change the Jacobian matrix J. Based on the characteristics of the Jacobian matrix J related to the system admittance, the short-circuit ratio at the DC grid-connected point is increased, as shown in formula (40).

[0142]

[0143] in, is the number of disconnected lines at the e-th loop iteration, is the number of disconnected lines at the e-1th iteration, is the number of newly created lines in the e-th loop iteration, is the number of new lines created at the e-1th iteration.

[0144] It should be noted that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0145] In one embodiment, if Figure 4As shown, the capacity of the thermal power unit to be built is 3405MW, the capacity of the wind power unit to be built is 1200MW, and the capacity of the photovoltaic unit to be built is 1200MW. Busbars 3 and 4 are connected to 100MW of voltage source converter UHV DC, busbar 8 is connected to 200MW of line-commutated converter UHV DC, and the switches are used to connect the UHV DC. Figure 4 The unit capacity investment and construction cost of thermal power units is 5,000,000 yuan / MW, the unit capacity investment and construction cost of wind turbines is 8,000,000 yuan / MW, the unit capacity investment and construction cost of photovoltaic units is 6,000,000 yuan / MW, the unit length investment and construction cost of lines is 6,000,000 yuan / km, the fuel cost is 300 yuan / MWh, the load shedding cost is 25,000 yuan / MWh, and the abandoned energy cost is 300 yuan / MWh. The normalized values ​​of wind and solar output and load on a typical day are shown in Table 1. In this embodiment, the solution results of whether the short-circuit current constraint is taken into account are compared. Scheme 1 does not include the short-circuit current constraint, and Scheme 2 is the source-network collaborative planning method described in this embodiment that includes short-circuit current and short-circuit ratio constraints. The model is solved using the YALMIP toolkit and the Gurobi solver, and the solution accuracy is set to 0.5%. The solution results are shown in Table 2.

[0146] Table 1

[0147]

[0148]

[0149] Table 2

[0150]

[0151] Among them, the over-limit short-circuit current 1 (37 / 35) in Table 2 means that the short-circuit current at bus node 1 is 37kA, the maximum allowable short-circuit current is 35kA, the over-limit short-circuit ratio 1.9 / 2 means that the short-circuit ratio is 1.9, and the lower limit of the short-circuit ratio is 2, and the rest are similar.

[0152] It can be seen from Table 2 that the source-network collaborative planning method described in this application ensures that the system short-circuit current and short-circuit ratio are within the allowable range by reasonably building new lines or disconnecting lines while ensuring economy.

[0153] The source-network collaborative planning method, apparatus, storage medium and computer equipment described in the present application take into account both the system short-circuit current and the short-circuit ratio in the source-network collaborative planning model, embed short-circuit current and short-circuit ratio constraints that take into account the impact of structural adjustment, new energy clusters, and ultra-high voltage direct current grid connection, and make the system short-circuit current and short-circuit ratio meet the constraints by disconnecting and adding lines. While ensuring the safety of the system short-circuit current, it takes into account the strength of the power grid, which is more in line with the future development trend of the receiving system.

[0154] Furthermore, if Figure 2 As shown, as a specific implementation of the above-mentioned source network collaborative planning method, an embodiment of the present application provides a source network collaborative planning device 200, which includes: a determination module 201, an update measurement module 202, a calculation module 203 and a correction module 204.

[0155] The determination module 201 is used to determine the planning information of the power grid according to the information of the power grid to be built and based on the source-network collaborative planning model; wherein the source-network collaborative planning model includes a target planning function with the minimum total planning cost of the power grid as the goal and the operation constraints of the power grid;

[0156] An updating module 202, configured to update the topology of the power grid according to the planning information;

[0157] A calculation module 203 is used to calculate the short-circuit current of the bus node in the updated topological structure of the power grid, and calculate the short-circuit ratio at the DC grid connection point in the grid connection point corresponding to the generator set in the updated topological structure of the power grid;

[0158] The correction module 204 is used to correct the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information.

[0159] The correction module 204 is specifically used to update the line planning information in the planning information if the short-circuit current of the bus node or the short-circuit ratio at the DC grid-connected point does not meet the preset conditions, and input the updated line planning information into the source network collaborative planning model to re-determine the planning information until the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions; if the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions, then the planning information corresponding to the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point that meet the preset conditions is determined as the target planning information.

[0160] Correction module 204 is specifically used to increase the number of disconnected lines in the line planning information according to a preset number to update the line planning information if the short-circuit current of the bus node is greater than a first preset threshold value; if the short-circuit ratio at the DC grid connection point is less than a second preset threshold value, increase the number of newly created lines in the line planning information according to a preset number to update the line planning information.

[0161] The calculation module 203 is specifically used to determine the target self-impedance of the bus nodes in the updated power grid according to the planning information, the initial self-impedance of the bus nodes in the power grid before the current update, and the mutual impedance between the bus nodes in the power grid before the current update; and determine the short-circuit current of the bus nodes in the updated power grid according to the target self-impedance of the bus nodes, the equivalent current at the grid connection point corresponding to the generator set, and the mutual impedance between the grid connection point corresponding to the generator set and the bus nodes in the updated power grid, with the short-circuit current of the bus nodes being less than or equal to the maximum short-circuit current of the bus nodes as a constraint.

[0162] In one embodiment, the source network collaborative planning device 200 further includes:

[0163] A judgment module is used to determine the equivalent current at the grid connection point corresponding to the newly built unit according to the d-axis current reference value and the q-axis current reference value at the grid connection point corresponding to the generator set if the grid connection point corresponding to the generator set is a preset type of grid connection point; wherein, in response to the normal operation instruction of the grid connection point corresponding to the generator set, the d-axis current reference value at the grid connection point corresponding to the generator set is determined according to the rated current at the grid connection point corresponding to the generator set, and the q-axis current reference value at the grid connection point corresponding to the generator set is determined to be 0; in response to the abnormal operation instruction of the grid connection point corresponding to the generator set, the d-axis current reference value and the q-axis current reference value at the grid connection point corresponding to the generator set are determined according to the voltage at the grid connection point corresponding to the generator set.

[0164] The calculation module 203 is specifically used to determine the correction amount of the Jacobian matrix in the steady-state power flow equation of the AC system connected to the DC grid-connected point according to the type of the converter corresponding to the DC grid-connected point and the control method of the converter; determine the multi-input influence factor corresponding to the DC grid-connected point according to the correction amount; determine the short-circuit ratio at the DC grid-connected point according to the multi-input influence factor corresponding to the DC grid-connected point, the rated capacity of the DC system corresponding to the DC grid-connected point, and the short-circuit capacity of the AC system connected to the DC grid-connected point.

[0165] The calculation module 203 is specifically used to determine the correction amount according to the parameter data associated with the converter corresponding to the DC grid-connected point, the DC voltage at the DC grid-connected point, the no-load voltage of the DC side at the DC grid-connected point, and the DC current at the DC grid-connected point if the type of the converter corresponding to the DC grid-connected point is a line-commutated converter; if the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a droop control mode, then the correction amount is determined according to the voltage droop control coefficient of the DC grid-connected point; if the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a mode other than the droop control mode, then the correction amount is determined to be 0.

[0166] For the specific limitations of the source network collaborative planning device, please refer to the limitations of the source network collaborative planning method above, which will not be repeated here. Each module in the above-mentioned source network collaborative planning device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0167] Based on the above Figure 1 The method shown in the embodiment of the present application accordingly provides a readable storage medium on which a computer program is stored, and when the program is executed by a processor, the above-mentioned Figure 1 The source network collaborative planning method shown.

[0168] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0169] Based on the above Figure 1 The method shown, and Figure 2 In order to achieve the above-mentioned purpose, the embodiment of the present application further provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a storage medium and a processor; the storage medium is used to store a computer program; the processor is used to execute the computer program to achieve the above-mentioned Figure 1 The source network collaborative planning method shown.

[0170] Optionally, the computer device may further include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a Bluetooth interface, a WI-FI interface), etc.

[0171] Those skilled in the art will appreciate that the computer device structure provided in this embodiment does not limit the computer device, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0172] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages and saves the hardware and software resources of the computer device, and supports the operation of information processing programs and other software and / or programs. The network communication module is used to realize communication between the components inside the storage medium, and communication with other hardware and software in the physical device.

[0173] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform, or the embodiments of the present application can be implemented by hardware.

[0174] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0175] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A source network collaborative planning method, characterized in that: The method comprises: According to the information of the power grid to be built, based on the source-network collaborative planning model, the planning information of the power grid is determined; wherein the source-network collaborative planning model includes a target planning function with the minimum total planning cost of the power grid as the goal, and the operation constraint conditions of the power grid; Updating the topology of the power grid according to the planning information; Calculating the short-circuit current of the busbar node in the updated topological structure of the power grid, and calculating the short-circuit ratio at the DC grid connection point in the grid connection points corresponding to the generator sets in the updated topological structure of the power grid; The planning information is corrected according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information.

2. The source network collaborative planning method according to claim 1, characterized in that: The step of correcting the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information includes: If the short-circuit current of the bus node or the short-circuit ratio at the DC grid connection point does not meet the preset conditions, the line planning information in the planning information is updated, and the updated line planning information is input into the source network collaborative planning model, and the planning information is re-determined until the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point both meet the preset conditions; If the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point both meet the preset conditions, the planning information corresponding to the short-circuit current of the bus node and the short-circuit ratio at the DC grid-connected point that meet the preset conditions is determined as the target planning information.

3. The source network collaborative planning method according to claim 2, characterized in that: If the short-circuit current of the bus node or the short-circuit ratio at the DC grid connection point does not meet the preset condition, updating the line planning information in the planning information includes: If the short-circuit current of the bus node is greater than a first preset threshold, the number of disconnected lines in the line planning information is increased according to a preset number to update the line planning information; If the short-circuit ratio at the DC grid-connected point is less than a second preset threshold, the number of newly created lines in the line planning information is increased according to the preset number to update the line planning information.

4. The source network collaborative planning method according to claim 1, characterized in that: The calculating of the short-circuit current of the bus node in the updated topological structure of the power grid comprises: Determine the target self-impedance of the bus nodes in the power grid after the update according to the planning information, the initial self-impedance of the bus nodes in the power grid before the update, and the mutual impedance between the bus nodes in the power grid before the update; With the short-circuit current of the bus node being less than or equal to the maximum short-circuit current of the bus node as a constraint, the short-circuit current of the bus node in the updated power grid is determined according to the target self-impedance of the bus node, the equivalent current at the grid-connected point corresponding to the generator set, and the mutual impedance between the grid-connected point corresponding to the generator set and the updated bus node in the power grid.

5. The source network collaborative planning method according to claim 4, characterized in that: The method further comprises: If the grid connection point corresponding to the generator set is a preset type of grid connection point, then determining the equivalent current at the grid connection point corresponding to the newly built unit according to the d-axis current reference value and the q-axis current reference value at the grid connection point corresponding to the generator set; In response to a normal operation instruction of the grid connection point corresponding to the generator set, a d-axis current reference value at the grid connection point corresponding to the generator set is determined according to the rated current at the grid connection point corresponding to the generator set, and the q-axis current reference value at the grid connection point corresponding to the generator set is determined to be 0; In response to an abnormal operation instruction of the grid connection point corresponding to the generator set, a d-axis current reference value and a q-axis current reference value at the grid connection point corresponding to the generator set are determined according to the voltage at the grid connection point corresponding to the generator set.

6. The source network collaborative planning method according to claim 1, characterized in that: The calculating of the short-circuit ratio at the DC grid connection point in the grid connection point corresponding to the generator set in the updated topological structure of the power grid includes: Determining a correction amount of a Jacobian matrix in a steady-state power flow equation of an AC system to which the DC grid-connected point is connected, according to a type of a converter corresponding to the DC grid-connected point and a control method of the converter; Determining a multi-feed impact factor corresponding to the DC grid connection point according to the correction amount; The short-circuit ratio at the DC grid connection point is determined according to the multi-feed influence factor corresponding to the DC grid connection point, the rated capacity of the DC system corresponding to the DC grid connection point, and the short-circuit capacity of the AC system connected to the DC grid connection point.

7. The source network collaborative planning method according to claim 6, characterized in that: The method of determining the correction amount of the Jacobian matrix in the steady-state power flow equation of the AC system to which the DC grid-connected point is connected according to the type of the converter corresponding to the DC grid-connected point and the control mode of the converter comprises: If the type of the converter corresponding to the DC grid-connected point is a line-commutated converter, the correction amount is determined according to parameter data associated with the converter corresponding to the DC grid-connected point, the DC voltage at the DC grid-connected point, the DC side no-load voltage at the DC grid-connected point, and the DC current at the DC grid-connected point; If the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a droop control mode, the correction amount is determined according to the voltage droop control coefficient of the DC grid-connected point; If the type of the converter corresponding to the DC grid-connected point is a voltage source converter, and the control mode of the converter is a mode other than the droop control mode, the correction amount is determined to be 0.

8. A source network collaborative planning device, characterized in that: The device comprises: A determination module, configured to determine the planning information of the power grid according to the information of the power grid to be built and based on the source-network collaborative planning model; wherein the source-network collaborative planning model includes a target planning function with the goal of minimizing the total planning cost of the power grid and the operation constraints of the power grid; An updating module, used for updating the topology of the power grid according to the planning information; A calculation module, used to calculate the short-circuit current of the bus node in the updated topological structure of the power grid, and calculate the short-circuit ratio at the DC grid connection point in the grid connection points corresponding to the generator sets in the updated topological structure of the power grid; The correction module is used to correct the planning information according to the short-circuit current of the bus node and the short-circuit ratio at the DC grid connection point to determine the target planning information.

9. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or instruction is executed by a processor, the steps of the source network collaborative planning method according to any one of claims 1 to 7 are implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the program, the source network collaborative planning method according to any one of claims 1 to 7 is implemented.

Images