Transmission network SFCL configuration method and device

Abstract

The invention discloses a transmission network SFCL configuration method and device. The method comprises the following steps: acquiring basic data of a transmission network; according to the basic data, establishing a power transmission network planning model by taking the minimum SFCL comprehensive configuration cost as a target; constructing a power transmission network operation constraint and an SFCL operation constraint of the power transmission network planning model based on the basic data; solving the power transmission network planning model under the constraints of power transmission network operation constraints and SFCL operation constraints, and generating configuration types and configuration positions of the SFCLs when the SFCL comprehensive configuration cost is minimum; wherein the configuration type of the SFCL comprises a resistance type and an inductance type; and performing SFCL configuration in the power transmission network according to the configuration type of each SFCL and the configuration position of each SFCL.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission network planning, and in particular to a power transmission network SFCL configuration method and device. Background Art

[0002] With the development of the transmission network, in order to meet the future load demand of the power system, the load capacity of the transmission network needs to be expanded. TCSC (Thyristor Controlled Series Capacitors) can be used to improve the transmission capacity of existing lines, voltage stability and ensure the flexible operation of the power system, and is widely used in the transmission network. However, when TCSC is added to the existing transmission network, TCSC will reduce the transmission impedance to increase the short-circuit current of the existing substation, causing the short-circuit current to exceed the limit value and causing a short circuit in the transmission network. To solve the substation short-circuit problem caused by TCSC, the existing method is to upgrade the short-circuit level of substation components, such as substation switchgear, substation transformers and other equipment, but this method of directly upgrading the substation equipment will cause long-term power outages in the transmission network during the upgrade.

[0003] SFCL (Superconducting Fault Current Limiter) can quickly show a large impedance to limit the short-circuit current under fault conditions, so it can be used to effectively suppress the fault current. Configuring SFCL in a transmission network including TCSC can avoid the direct upgrade and transformation of substation equipment, and the short-circuit problem caused by TCSC can be limited by SFCL. Summary of the invention

[0004] The embodiment of the present invention provides a transmission network SFCL configuration method and device, which can effectively solve the problem in the prior art that the substation needs to upgrade the short-circuit current due to the introduction of TCSC in the transmission network, eliminates the need for direct upgrade and modification of substation equipment, and solves the short-circuit problem caused by TCSC by adding SFCL in the transmission network.

[0005] An embodiment of the present invention provides a method for configuring a transmission network SFCL, including:

[0006] Obtaining basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the resistive SFCL in series with each line, the parallel equivalent susceptance range generated by the resistive SFCL in series with each line, and the upper limit of the short-circuit current;

[0007] According to the basic data, a transmission network planning model is constructed with the goal of minimizing the comprehensive configuration cost of SFCL; and based on the basic data, the transmission network operation constraints and SFCL operation constraints of the transmission network planning model are constructed;

[0008] Under the constraints of the transmission network operation constraints and the SFCL operation constraints, the transmission network planning model is solved to generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type;

[0009] The SFCLs are configured in the transmission network according to the configuration type of each SFCL and the configuration location of each SFCL.

[0010] Furthermore, the transmission network planning model is specifically:

[0011]

[0012]

[0013] Among them, C is the transmission network planning model; C I is the investment cost; C OP is the operating cost; LC is a collection of lines; is the investment cost of line l; Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; γ is the investment discount rate; is the TCSC investment cost when the maximum compensation level of line l is q; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 Indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1; The cost of adding a resistive SFCL to the module r on line l; is the cost of adding an inductive SFCL to x modules on line l; e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; e l,r,t-1 Indicates whether line l contains a resistive SFCL on module r at time t-1; f l,x,t Indicates whether line l contains an inductive SFCL on module x at time t; f l,x,t-1 Indicates whether line l contains an inductive SFCL on module x at time t-1; The cost of adding a resistive SFCL to the module r on the generator g; is the cost of adding an inductive SFCL to the x module on the generator g; v g,r,t Indicates whether the module r on the generator g at time t contains a resistive SFCL; v g,r,t-1 Indicates whether the module r on the generator g at time t-1 contains a resistive SFCL; w g,x,t Indicates whether the generator g on the x module at time t contains an inductive SFCL; w g,x,t-1 Indicates whether the x module on the generator g at time t-1 contains an inductive SFCL; is the active output of generator g at time t with demand level d; is the unit operating cost of generator g; τ d is the duration of demand level d; is the power loss when the demand level is d at time t; ψ l,q,t , l,q,t-1 、e l.r.t 、e l,r,t-1 、f l,x,t 、f l,x,t-1 、v g,r,t 、v g,r,t-1 、w g,x,t and w g,x,t-1 All use Boolean values.

[0014] Furthermore, the transmission network operation constraints include: basic operation constraints, node power constraints, node voltage constraints, generator operation constraints and power flow constraints.

[0015] Furthermore, the basic operation constraints are specifically:

[0016]

[0017] ψ l,q,t ≥ψ l,q,t-1 ;

[0018]

[0019] in, Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 It indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1.

[0020] Furthermore, the node power constraint is specifically:

[0021]

[0022] in, is the active output of generator g at time t with demand level d; is the reactive power output of generator g at time t with demand level d; Indicates the position relationship between generator g and node i. The value is 1 when generator g is on node i and 0 when generator g is not on node i. is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the active load from node i to node j when the demand level is d at time t; is the reactive load from node i to node j when the demand level is d at time t.

[0023] Furthermore, the node voltage constraint is specifically:

[0024] V i min ≤V i,d,t ≤V i max ;

[0025]

[0026] Among them, V i min is the lower bound of the voltage amplitude at node i; V i max is the upper limit of the voltage amplitude at node i; V i,d,t is the voltage of node i when the demand level is d at time t; i,d,t is the voltage angle of node i when the demand level is d at time t.

[0027] Furthermore, the generator operation constraints are specifically:

[0028]

[0029] in, is the lower bound of the active power amplitude of generator g; is the upper limit of the active power amplitude of generator g; is the active power amplitude of generator g when the demand level is d at time t; is the lower bound of the reactive power amplitude of generator g; is the upper bound of the reactive power amplitude of generator g; is the reactive power amplitude of generator g when the demand level is d at time t.

[0030] Furthermore, the power flow constraint is specifically:

[0031]

[0032] in, is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the line conductance when the demand level is d at time t during normal operation; V is the line susceptance when the demand level is d at time t during normal operation; i,d,t is the voltage of node i when the demand level is d at time t; V j,d,t is the voltage of node j when the demand level is d at time t; is the dynamic maximum apparent power of line ij at time t; ij,d,t is the voltage angle of line ij when the demand level is d at time t.

[0033] Furthermore, the SFCL operation constraints are specifically:

[0034]

[0035] Among them, e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; Indicates whether line l participates in planning within time t; f l,x,t Indicates whether line l contains an inductive SFCL on x modules at time t; is the parallel equivalent conductance generated by the series resistance SFCL of module r on line l; is the parallel equivalent susceptance generated by the series resistance SFCL of module r on line l; is the parallel equivalent conductance generated by the series inductive SFCL of x modules on line l; is the parallel equivalent susceptance generated by the series inductive SFCL of x modules on line l; Indicates the connection relationship between line l and nodes i and j; is the amount of conductivity increase; is the increase in susceptance; is the conductance of line l; is the susceptance of line l; is the minimum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the minimum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the parallel equivalent conductance added to line ij when line ij is connected in series with SFCL; It is the parallel equivalent susceptance added to line ij when line ij is connected in series with SFCL; is the parallel equivalent conductance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent susceptance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent conductance generated by the resistive SFCL of module r at the generator g; is the parallel equivalent conductance generated by the inductive SFCL of x modules at the generator g; is the short-circuit current of node i when the demand level is d at time t; is Z at time t BUS The diagonal element i of It is the upper limit of short-circuit current.

[0036] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0037] An embodiment of the present invention provides a transmission network SFCL configuration device, including a data acquisition module, a model and constraint condition construction module, a model solving module and a planning module;

[0038] The data acquisition module is used to acquire basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the series resistance SFCL of each line, the parallel equivalent susceptance range generated by the series resistance SFCL of each line, and the upper limit of the short-circuit current;

[0039] The model and constraint condition construction module is used to construct a transmission network planning model based on the basic data with the goal of minimizing the comprehensive configuration cost of SFCL; and to construct the transmission network operation constraints and SFCL operation constraints of the transmission network planning model based on the basic data;

[0040] The model solving module and the planning module are used to solve the transmission network planning model under the constraints of the transmission network operation constraints and the SFCL operation constraints, and generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type; and the SFCL is configured in the transmission network according to the configuration type and configuration position of each SFCL.

[0041] The following beneficial effects are achieved by implementing the present invention:

[0042] The present invention discloses a transmission network SFCL configuration method and device, the method acquires basic data of the transmission network, constructs a transmission network planning model with the goal of minimizing the comprehensive configuration cost of SFCL and the transmission network operation constraints and SFCL operation constraints corresponding to the model through the basic data, and then solves the model under the above-mentioned constraint conditions to generate the configuration type of each SFCL and the configuration position of each SFCL when the comprehensive configuration cost of SFCL is minimized, and then configures the SFCL in the transmission network according to the configuration type of each SFCL and the configuration position of each SFCL, so that the configured transmission network includes SFCL, solves the short circuit problem caused by TCSC by adding SFCL in the transmission network, solves the problem of the prior art that the substation needs to upgrade the short-circuit current due to the introduction of TCSC in the transmission network, avoids the direct upgrade and transformation of the substation equipment, and reduces the problem of long-term power interruption in the process of transmission network upgrade planning. Further, the configuration type of SFCL configuration is considered, so that the configured SFCL is more suitable for the load and power demand of the transmission network. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a flowchart of a method for configuring a transmission network SFCL provided by an embodiment of the present invention.

[0044] Figure 2 4 is a voltage stability margin comparison diagram provided by an embodiment of the present invention.

[0045] Figure 3 It is a structural schematic diagram of a transmission network SFCL configuration device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, an embodiment of the present invention provides a method for configuring a transmission network SFCL, including:

[0048] Step S1: Obtain basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the series resistance SFCL of each line, the parallel equivalent susceptance range generated by the series resistance SFCL of each line, and the upper limit of the short-circuit current;

[0049] Step S2: constructing a transmission network planning model based on the basic data and taking the minimum comprehensive configuration cost of SFCL as the goal; and constructing the transmission network operation constraints and SFCL operation constraints of the transmission network planning model based on the basic data;

[0050] Step S3: Under the constraints of the transmission network operation constraints and the SFCL operation constraints, the transmission network planning model is solved to generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type;

[0051] Step S4: configuring the SFCLs in the transmission network according to the configuration type and the configuration location of each SFCL.

[0052] For step S1, basic data of the transmission network is obtained, including the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the resistive SFCL in series with each line, the parallel equivalent susceptance range generated by the resistive SFCL in series with each line, and the upper limit of the short-circuit current.

[0053] For step S2, based on the basic data obtained in step S1, with the goal of minimizing the comprehensive configuration cost of SFCL, that is, minimizing the comprehensive investment cost and operating cost of the transmission network after adding SFCL, a transmission network planning model is constructed, as well as the transmission network operating constraints and SFCL operating constraints corresponding to the transmission network planning model.

[0054] In a preferred embodiment, the transmission network planning model is specifically:

[0055]

[0056] Among them, C is the transmission network planning model; C I is the investment cost; C OP is the operating cost; LC is a collection of lines; is the investment cost of line l; Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; γ is the investment discount rate; is the TCSC investment cost when the maximum compensation level of line l is q; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 Indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1; The cost of adding a resistive SFCL to the module r on line l; is the cost of adding an inductive SFCL to x modules on line l; e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; e l,r,t-1 Indicates whether line l contains a resistive SFCL on module r at time t-1; f l,x,t Indicates whether line l contains an inductive SFCL on module x at time t; f l,x,t-1 Indicates whether line l contains an inductive SFCL on module x at time t-1; The cost of adding a resistive SFCL to the module r on the generator g; is the cost of adding an inductive SFCL to the x module on the generator g; v g,r,t Indicates whether the module r on the generator g at time t contains a resistive SFCL; v g,r,t-1 Indicates whether the module r on the generator g at time t-1 contains a resistive SFCL; w g,x,t Indicates whether the generator g on the x module at time t contains an inductive SFCL; w g,x,t-1 Indicates whether the x module on the generator g at time t-1 contains an inductive SFCL; is the active output of generator g at time t with demand level d; is the unit operating cost of generator g; τ d is the duration of demand level d; is the power loss when the demand level is d at time t; ψ l,q,t , l,q,t-1 、e l.r.t 、e l,r,t-1 、f l,x,t 、f l,x,t-1 、v g,r,t 、v g,r,t-1 、w g,x,t and w g,x,t-1 All use Boolean values.

[0057] It should be noted that in the above transmission network planning model, ψ l,q,t , l,q,t-1 、e l.r.t 、e l,r,t-1 、f l,x,t 、f l,x,t-1 、v g,r,t 、v g,r,t-1 、w g,x,t and w g,x,t-1 Both use Boolean values; if line l is not involved in the planning at time t, The value is 0. If line l participates in planning at time t, The value is 1; if line l contains a TCSC with a maximum compensation level of q within time t, ψ l,q,t The value is 1; if line l does not contain a TCSC with a maximum compensation level of q within time t, ψ l,q,t The value is 0; line l contains a resistive SFCL on the module t time r, e l.r.t The value is 1; line l does not contain a resistive SFCL on module r at time t, e l.r.t The value is 0; line l contains an inductive SFCL on the x module at time t, fl,x,t The value is 1; line l does not contain an inductive SFCL on the x module at time t, f l,x,t The value is 0; the time generator g on the r module contains a resistive SFCL, v g,r,t The value is 1; the module on the generator g at time t does not contain a resistive SFCL, v g,r,t The value is 0; the generator g on the x module contains the inductive SFCL, w g,x,t The value is 1; the generator g at time t does not contain an inductive SFCL on the x module, w g,x,t The value is 0. In addition, γ、 These cost and expense related parameters are fixed values, such as is the unit operating cost of generator g. For each generator, the operating cost required for generating electricity per unit time is a fixed value, and this objective fixed value is used as the value involved in the calculation. The above lines all refer to the lines that can be planned as candidate lines when planning the transmission network.

[0058] In a preferred embodiment, the transmission network operation constraints include: basic operation constraints, node power constraints, node voltage constraints, generator operation constraints and power flow constraints.

[0059] Specifically, the operation constraints of the transmission network mainly refer to the operation constraints of the transmission network when no new SFCLs are added and only new lines and TCSCs are added.

[0060] In a preferred embodiment, the basic operation constraints are specifically:

[0061]

[0062] ψ l,q,t ≥ψ l,q,t-1 ; (5)

[0063]

[0064] in, Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 It indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1.

[0065] Specifically, if a new line or TCSC is configured in a time period, the constraints of the above formulas (4) and (5) can ensure that the newly added line and TCSC in the subsequent event period are also available in the subsequent time period. The above formula (6) indicates that TCSC is only installed on the selected line, which ensures that only a specific TCSC compensation level is selected in each time interval.

[0066] In a preferred embodiment, the node power constraint is specifically:

[0067]

[0068] in, is the active output of generator g at time t with demand level d; is the reactive power output of generator g at time t with demand level d; Indicates the position relationship between generator g and node i. The value is 1 when generator g is on node i and 0 when generator g is not on node i. is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the active load from node i to node j when the demand level is d at time t; is the reactive load from node i to node j when the demand level is d at time t.

[0069] Specifically, formula (7) represents the active power balance constraint of each node, and formula (8) represents the reactive power balance constraint of each node.

[0070] In a preferred embodiment, the node voltage constraint is specifically:

[0071] V i min ≤V i,d,t ≤V i max ; (9)

[0072]

[0073] Among them, V i min is the lower bound of the voltage amplitude at node i; V i max is the upper limit of the voltage amplitude at node i; V i,d,t is the voltage of node i when the demand level is d at time t; i,d,t is the voltage angle of node i when the demand level is d at time t.

[0074] In a preferred embodiment, the generator operation constraints are specifically:

[0075]

[0076] in, is the lower bound of the active power amplitude of generator g; is the upper limit of the active power amplitude of generator g; is the active power amplitude of generator g when the demand level is d at time t; is the lower bound of the reactive power amplitude of generator g; is the upper bound of the reactive power amplitude of generator g; is the reactive power amplitude of generator g when the demand level is d at time t.

[0077] In a preferred embodiment, the power flow constraint is specifically:

[0078]

[0079] in, is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the line conductance when the demand level is d at time t during normal operation; V is the line susceptance when the demand level is d at time t during normal operation; i,d,t is the voltage of node i when the demand level is d at time t; V j,d,t is the voltage of node j when the demand level is d at time t; is the dynamic maximum apparent power of line ij at time t; ij,d,t is the voltage angle of line ij when the demand level is d at time t.

[0080] In a preferred embodiment, the SFCL operation constraints are specifically:

[0081]

[0082] Among them, e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; Indicates whether line l participates in planning within time t; f l,x,t Indicates whether line l contains an inductive SFCL on x modules at time t; is the parallel equivalent conductance generated by the series resistance SFCL of module r on line l; is the parallel equivalent susceptance generated by the series resistance SFCL of module r on line l; is the parallel equivalent conductance generated by the series inductive SFCL of x modules on line l; is the parallel equivalent susceptance generated by the series inductive SFCL of x modules on line l; Indicates the connection relationship between line l and nodes i and j. It is a Boolean value. If line l connects nodes i and j at the same time, then The value is 1. If line l does not connect nodes i and j at the same time, then The value is 0; is the amount of conductivity increase; is the amount of electrical susceptance increase; is the conductance of line l; is the susceptance of line l; is the minimum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the minimum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the parallel equivalent conductance added to line ij when line ij is connected in series with SFCL; It is the parallel equivalent susceptance added to line ij when line ij is connected in series with SFCL; is the parallel equivalent conductance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent susceptance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent conductance generated by the resistive SFCL of module r at the generator g; is the parallel equivalent conductance generated by the inductive SFCL of x modules at the generator g; is the short-circuit current of node i when the demand level is d at time t; is Z at time t BUS The diagonal element i of It is the upper limit of short-circuit current.

[0083] Specifically, equations (16) and (17) represent the constraints that must be followed when installing resistive SFCLs and inductive SFCLs in the selected lines. Equations (18) and (19) represent the equivalent parallel admittance added to line ij due to line SFCL. Equations (20) and (21) represent the incremental admittance of the transmission line due to the addition of new lines, TCSCs, and SFCLs. Equations (22) and (23) represent the effect of generator SFCL on node self-admittance. Equation (24) represents the use of the updated Z BUS The short-circuit current of all nodes in the transmission network calculated by the diagonal elements must satisfy the constraint of being less than the upper limit of the short-circuit current, so as to achieve the desired effect of the present invention.

[0084] Regarding the transmission network impedance matrix, it is necessary to add that after adding new lines, TCSC and SFCL, the network impedance matrix will change, and the change value of the network impedance matrix needs to be calculated. This is because the present invention connects TCSC / SFCL in series with the existing / new lines, and the components related to the lines are added, which changes the original Z BUS The diagonal elements can be converted into their parallel equivalent admittances. Specifically, in Z BUS Add a diagonal element to the existing line mn Increase Post Z BUS The change in the diagonal element i of for:

[0085]

[0086] in, Represents the diagonal element value of the original impedance matrix at node m; Represents the diagonal element value of the original impedance matrix at node n; To increase Post Z BUS The amount of change in the diagonal element i of ; the superscript L indicates the change due to the addition of line-related components; Indicates that a new component SFCL has been added to the line; Represents Z BUS The original elements ij of (in bold to indicate plural); is the branch impedance between nodes m and n. Define the constant and And sum the parallel admittance of all added components to calculate Z BUS The change of diagonal element i is:

[0087]

[0088] The superscript PLS indicates that the line is connected in series with the SFCL; the superscript PT indicates the effect of the TCSC on the line. In fact, all changes caused by adding new components are incorporated in the above formula and only apply to the original Z BUS element at a time. This one-step Z BUS Update, rather than repeatedly update, reducing the number of constraints in the optimization problem. The above formula is rewritten using the real part and the imaginary part respectively:

[0089]

[0090] in, Its components represent the total parallel conductance and susceptance of the new component.

[0091] After adding the generator SFCL, the network impedance changes as follows:

[0092] The impedance at node m is The series generator SFCL can be expressed as the equivalent parallel admittance As shown below:

[0093]

[0094] in, is the generator impedance; Represents Z BUS The diagonal elements i of The amount of change produced.

[0095] By defining the constant and Formula (29) can be simplified as:

[0096]

[0097] Among them, C i,m and D m Can be obtained from the original Z BUS Calculate it. Rewrite the complex quantity in the above formula using the real and imaginary parts to get:

[0098]

[0099] Based on the above Z BUS The theory of diagonal element changes, based on formulas (27) and (31), shows that after adding new components to the transmission network, namely, adding new lines, TCSCs and SFCLs, Z BUS The diagonal element i changes as follows:

[0100]

[0101]

[0102] Using the updated Z BUS The diagonal elements, i.e., Z at time t BUS The diagonal element i of and the voltage of node i when the time demand level is d can be used to calculate the short-circuit current of node i when the time demand level is d, and then the short-circuit current of all nodes in the transmission network can be obtained. Combined with formula (24), it is determined whether the calculated short-circuit current meets the constraints.

[0103] For step S3, solving the transmission network planning model under all the above constraints, the present invention proposes an improved Benders algorithm to solve the transmission network planning model. First, linearization is performed on the nonlinear constraints corresponding to the model.

[0104] The power flow equation is the variable The impedance matrix change equation is Using the first-order Taylor series expansion, these nonlinear functions are linearized around the base point X0 as follows:

[0105]

[0106] Among them, X 1,0 , X 2,0 are the values ​​of X1 and X2 at the base point X0 respectively; the superscript LN represents the linearized value of the nonlinear function.

[0107] The quadratic constraint linearization results are as follows:

[0108]

[0109] Among them, a k ,b k ,c k is a constant that defines the slope and position of line k. The area a enclosed by these lines k x+b k y≤c k The intersection of r is approximated as the area of ​​the circle, which can be approximated by a number of lines defining a polygon inside the circle at equally spaced points.

[0110] Similarly, the nonlinear equation (9) can be rewritten as the following linear equation:

[0111]

[0112] Furthermore, the present invention proposes a Benders decomposition scheme to minimize the linearization error of the above problem. The master problem (MP) of the decomposition scheme is determined, and this MP is a small MILP problem to determine the investment decision of the second hospital. The transmission network planning model and its corresponding constraints are transformed to obtain the following results:

[0113]

[0114] st(2),(4)-(6),(16)-(17)

[0115] Among them, st represents the constraint that needs to be satisfied, and the number behind it is the corresponding formula.

[0116] Subproblem 1 (SP1) of the Benders decomposition solution is proposed. SP1 is an LP problem as follows:

[0117]

[0118] st(3),(9)-(12),(16)-(23),(32),(35)-(38)

[0119] where Y is a vector of binary variables that obtain their values ​​from MP; SP1 is the dual value.

[0120] Furthermore, subproblem 2 (SP2) of the Benders decomposition solution is proposed. SP2 contains nonlinear functions and is an NLP problem as shown below:

[0122]

[0123] st(3),(13)-(14),(33)-(34),(35)-(40)

[0124] Among them, λ SP2 is the dual value.

[0125] Finally, based on the defined problem, the solvers Gurobi and Conopt are called to solve it respectively, and the configuration type and configuration position of each SFCL are obtained when the comprehensive configuration cost of SFCL is minimized.

[0126] For step S4, it is determined what type of SFCL to configure at what location in the transmission network according to the configuration type and configuration location of each SFCL, thereby reducing the cost of SFCL configuration while ensuring that the short-circuit current problem caused by TCSC is solved.

[0127] Preferably, Figure 2 As shown, it is a schematic diagram comparing the voltage stability margin of the existing transmission network planning scheme (traditional TEP) and the transmission network planning scheme (proposed TEP) proposed in the present invention. It can be seen that the scheme proposed in the present invention has a better effect.

[0128] Based on the above method embodiment, the present invention provides a corresponding device embodiment.

[0129] like Figure 3 As shown, an embodiment of the present invention provides a transmission network SFCL configuration device, including a data acquisition module, a model and constraint condition construction module, a model solving module and a planning module;

[0130] The data acquisition module is used to acquire basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the series resistance SFCL of each line, the parallel equivalent susceptance range generated by the series resistance SFCL of each line, and the upper limit of the short-circuit current;

[0131] The model and constraint condition construction module is used to construct a transmission network planning model based on the basic data with the goal of minimizing the comprehensive configuration cost of SFCL; and to construct the transmission network operation constraints and SFCL operation constraints of the transmission network planning model based on the basic data;

[0132] The model solving module and the planning module are used to solve the transmission network planning model under the constraints of the transmission network operation constraints and the SFCL operation constraints, and generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type; and the SFCL is configured in the transmission network according to the configuration type and configuration position of each SFCL.

[0133] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0134] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0135] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0136] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0137] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0138] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of each of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium.

[0139] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for configuring a transmission network SFCL, characterized in that: include: Obtaining basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the resistive SFCL in series with each line, the parallel equivalent susceptance range generated by the resistive SFCL in series with each line, and the upper limit of the short-circuit current; According to the basic data, a transmission network planning model is constructed with the goal of minimizing the comprehensive configuration cost of SFCL; and based on the basic data, the transmission network operation constraints and SFCL operation constraints of the transmission network planning model are constructed; Under the constraints of the transmission network operation constraints and the SFCL operation constraints, the transmission network planning model is solved to generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type; The SFCLs are configured in the transmission network according to the configuration type of each SFCL and the configuration location of each SFCL.

2. A method for configuring a transmission network SFCL according to claim 1, characterized in that: The transmission network planning model is specifically: Among them, C is the transmission network planning model; C I is the investment cost; C OP is the operating cost; LC is a collection of lines; is the investment cost of line l; Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; γ is the investment discount rate; is the TCSC investment cost when the maximum compensation level of line l is q; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 Indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1; The cost of adding a resistive SFCL to the module r on line l; is the cost of adding an inductive SFCL to x modules on line l; e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; e l,r,t-1 Indicates whether line l contains a resistive SFCL on module r at time t-1; f l,x,t Indicates whether line l contains an inductive SFCL on module x at time t; f l,x,t-1 Indicates whether line l contains an inductive SFCL on module x at time t-1; The cost of adding a resistive SFCL to the module r on the generator g; is the cost of adding an inductive SFCL to the x module on the generator g; v g,r,t Indicates whether the module r on the generator g at time t contains a resistive SFCL; v g,r,t-1 Indicates whether the module r on the generator g at time t-1 contains a resistive SFCL; w g,x,t Indicates whether the generator g on the x module at time t contains an inductive SFCL; w g,x,t-1 Indicates whether the x module on the generator g at time t-1 contains an inductive SFCL; is the active output of generator g at time t with demand level d; is the unit operating cost of generator g; τ d is the duration of demand level d; is the power loss when the demand level is d at time t; ψ l,q,t , l,q,t-1 、e l.r.t 、e l,r,t-1 、f l,x,t 、f l,x,t-1 、v g,r,t 、v g,r,t-1 、w g,x,t and w g,x,t-1 All use Boolean values.

3. A method for configuring a transmission network SFCL as claimed in claim 2, characterized in that: The transmission network operation constraints include: basic operation constraints, node power constraints, node voltage constraints, generator operation constraints and power flow constraints.

4. A method for configuring a transmission network SFCL as claimed in claim 3, characterized in that: The basic operation constraints are specifically: ψ l,q,t ≥ψ l,q,t-1 ; in, Indicates whether line l participates in planning within time t; Indicates whether line l participates in planning within time t-1; ψ l,q,t Indicates whether line l contains a TCSC with a maximum compensation level of q within time t; ψ l,q,t-1 It indicates whether line l contains a TCSC with a maximum compensation level of q within time t-1.

5. A method for configuring a transmission network SFCL as claimed in claim 4, characterized in that: The node power constraint is specifically: in, is the active output of generator g at time t with demand level d; is the reactive power output of generator g at time t with demand level d; Indicates the position relationship between generator g and node i. The value is 1 when generator g is on node i and 0 when generator g is not on node i. is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the active load from node i to node j when the demand level is d at time t; is the reactive load from node i to node j when the demand level is d at time t.

6. A method for configuring a transmission network SFCL as claimed in claim 5, characterized in that: The node voltage constraint is specifically: in, is the lower bound of the voltage amplitude at node i; is the upper limit of the voltage amplitude at node i; V i,d,t is the voltage of node i when the demand level is d at time t; i,d,t is the voltage angle of node i when the demand level is d at time t.

7. A method for configuring a transmission network SFCL according to claim 6, characterized in that: The generator operation constraints are specifically: in, is the lower bound of the active power amplitude of generator g; is the upper limit of the active power amplitude of generator g; is the active power amplitude of generator g when the demand level is d at time t; is the lower bound of the reactive power amplitude of generator g; is the upper bound of the reactive power amplitude of generator g; is the reactive power amplitude of generator g when the demand level is d at time t.

8. A method for configuring a transmission network SFCL as claimed in claim 7, characterized in that: The power flow constraints are specifically: in, is the active power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the reactive power flowing through the existing lines and lines from node i to node j when the demand level is d at time t; is the line conductance when the demand level is d at time t during normal operation; V is the line susceptance when the demand level is d at time t during normal operation; i,d,t is the voltage of node i when the demand level is d at time t; V j,d,t is the voltage of node j when the demand level is d at time t; is the dynamic maximum apparent power of line ij at time t; ij,d,t is the voltage angle of line ij when the demand level is d at time t.

9. A method for configuring a transmission network SFCL as claimed in claim 8, characterized in that: The SFCL operation constraints are specifically: Among them, e l.r.t Indicates whether line l contains a resistive SFCL on module r at time t; Indicates whether line l participates in planning within time t; f l,x,t Indicates whether line l contains an inductive SFCL on x modules at time t; is the parallel equivalent conductance generated by the series resistance SFCL of module r on line l; is the parallel equivalent susceptance generated by the series resistance SFCL of module r on line l; is the parallel equivalent conductance generated by the series inductive SFCL of x modules on line l; is the parallel equivalent susceptance generated by the series inductive SFCL of x modules on line l; Indicates the connection relationship between line l and nodes i and j; is the amount of conductivity increase; is the amount of electrical susceptance increase; is the conductance of line l; is the susceptance of line l; is the minimum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the minimum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent conductance generated by the TCSC at the maximum compensation level q of line l; is the maximum parallel equivalent susceptance generated by the TCSC at the maximum compensation level q of line l; is the parallel equivalent conductance added to line ij when line ij is connected in series with SFCL; It is the parallel equivalent susceptance added to line ij when line ij is connected in series with SFCL; is the parallel equivalent conductance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent susceptance added at node i when the generator is connected in series with the SFCL; is the parallel equivalent conductance generated by the resistive SFCL of module r at the generator g; is the parallel equivalent conductance generated by the inductive SFCL of x modules at the generator g; is the short-circuit current of node i when the demand level is d at time t; is Z at time t BUS The diagonal element i of It is the upper limit of short-circuit current.

10. A transmission network SFCL configuration device, characterized in that: include: Data acquisition module, model and constraint building module, model solving module and planning module; The data acquisition module is used to acquire basic data of the transmission network; wherein the basic data includes: the cost of adding a resistive SFCL on the transmission line, the cost of adding an inductive SFCL on the transmission line, the cost of adding a resistive SFCL on the generator, the cost of adding an inductive SFCL on the generator, the position relationship between the generator and the node, the node voltage amplitude range, the generator active power amplitude range, the generator reactive power amplitude range, the dynamic maximum apparent power of each line, the conductance of each line, the susceptance of each line, the parallel equivalent conductance range generated by the series resistance SFCL of each line, the parallel equivalent susceptance range generated by the series resistance SFCL of each line, and the upper limit of the short-circuit current; The model and constraint condition construction module is used to construct a transmission network planning model based on the basic data with the goal of minimizing the comprehensive configuration cost of SFCL; and to construct the transmission network operation constraints and SFCL operation constraints of the transmission network planning model based on the basic data; The model solving module and the planning module are used to solve the transmission network planning model under the constraints of the transmission network operation constraints and the SFCL operation constraints, and generate the configuration type and configuration position of each SFCL when the comprehensive configuration cost of the SFCL is minimized; wherein the configuration type of the SFCL includes: resistive type and inductive type; and the SFCL is configured in the transmission network according to the configuration type and configuration position of each SFCL.

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