CN113642818A - Method and device for evaluating installation scheme of inter-line moisture controller and electronic equipment - Google Patents

Method and device for evaluating installation scheme of inter-line moisture controller and electronic equipment Download PDF

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CN113642818A
CN113642818A CN202010390548.7A CN202010390548A CN113642818A CN 113642818 A CN113642818 A CN 113642818A CN 202010390548 A CN202010390548 A CN 202010390548A CN 113642818 A CN113642818 A CN 113642818A
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冯士睿
李金科
张诗滔
牛涛
王震泉
赵继超
张曼
孙顺祥
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China Energy Engineering Group Jiangsu Power Design Institute Co Ltd
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Abstract

The invention discloses an inter-line tidal current controller installation scheme evaluation method, an inter-line tidal current controller installation scheme evaluation device and electronic equipment, wherein the method comprises the steps of calculating the tidal current distribution of a regional power grid in a normal operation mode, and judging key sections which are possibly installed and lines with heavier loads of the sections; determining a respective main control line and an auxiliary control line for each key section line; establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model; and substituting the capacities of all ends designed by the IPFC into an upper layer model and a lower layer model to solve according to the boundary conditions of system operation to obtain an optimal installation scheme. The method converts the IPFC installation scheme evaluation problem into a hierarchical model optimization solution problem, has simpler and faster calculation, and can provide reference for planning and construction of the power transmission network.

Description

Method and device for evaluating installation scheme of inter-line moisture controller and electronic equipment
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a method and a device for evaluating an installation scheme of an inter-line tidal current controller and electronic equipment.
Background
In actual operation of a power grid, with continuous increase of loads, increasingly complex grid structures and uneven power flow distribution, the grid-connected power grid becomes an important factor for limiting the transmission capacity of the power grid. An Interline Power Flow Controller (IPFC) is a powerful flexible ac power transmission control device, which has the characteristic of directionally controlling power flow, and can 'carry' heavy-load line power flow to light-load lines, so as to realize power exchange between the lines. IPFC not only improves line power, but also dynamically controls the voltage, power angle and impedance of the system.
Currently, only American Marcy substation engineering in the world can operate in an IPFC working state, and other reference IPFC actual engineering cases are few. Therefore, for the installation position and the capacity of the IPFC, the prior art mostly has no excessive engineering experience, more tide transfer amount is taken as an evaluation index, the economy and the reliability cannot be guaranteed, the evaluation basis for the operation capacity of the IPFC is single, and the IPFC is difficult to be used for guiding engineering practice.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an inter-line tidal current controller installation scheme evaluation method, an inter-line tidal current controller installation scheme evaluation device and electronic equipment, which are used for carrying out solution research on key power transmission sections influencing the power supply capacity and the safety and reliability of a power grid, comparing technical economy and comprehensive benefits before and after the application of an IPFC scheme, carrying out comparative analysis on multiple angles of feasibility, total investment, influence on the power grid and the like, and selecting an optimal installation scheme.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides an inter-line tidal current controller installation scheme evaluation method, which comprises the following steps:
screening out key sections of a regional power grid, counting the power flow of each line in each key section, and determining a main control line and an auxiliary control line of each key section;
establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the interline power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and evaluating the installation scheme of the interline power flow controller of each key section based on the interline power flow controller upper-layer power regulation and control optimization model and the interline benefit optimization model.
Further, screening out the key section of the regional power grid includes:
under the normal operation and fault operation modes of the regional power grid, a set of a plurality of lines bearing power exchange between subsystems is a key section.
Further, the statistics of the power flow of each line in each critical section and the determination of the main control line and the auxiliary control line of each critical section include:
calculating the load flow P of the line r in the key sectionr；
Calculating a load flow out-of-limit coefficient of the line according to the load flow of the line and the rated operation capacity of the line:
Figure BDA0002485564060000021
wherein L isrIs the power flow threshold coefficient, P, of the line rr0The rated operation capacity of the line r is shown, and n is the total number of the lines in the key section;
sorting the power flow out-of-limit coefficients of the line from high to low, and selecting LrSelecting L as main control line for line more than 0rThe line corresponding to < 0 is the auxiliary control line.
Further, if LrIf not greater than 0, then L is defined1The corresponding circuit is a main control circuit, and the other circuits are auxiliary control circuits.
Further, according to the capacities of the corresponding ends of the main control line and the auxiliary control line, an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller are established:
Figure BDA0002485564060000031
Figure BDA0002485564060000032
Figure BDA0002485564060000033
Figure BDA0002485564060000034
wherein k is a regulatory ability coefficient, Δ P1xIn order to install the inter-line power flow controller, the main control line x can transfer the power flow, wherein x is 1,2, … m, m is the number of the main control lines, and S is1xInter-line power flow controller capacity, Δ P, for master control line x2jThe tidal current j which can be accepted by the auxiliary control line j after the inter-line tidal current controller is installed is 1,2, … q, q is the number of the auxiliary control lines, and S2jThe capacity of the interline power flow controller of the auxiliary control line j, delta P is the power flow transferred by the system by using the safety and stability control measure when the interline power flow controller is not installed, y is a benefit coefficient, E is economic benefit, Z is reliability benefit, eta1、η2Satisfies η for economic and reliability evaluation of coefficients1+η2α and β are unit capacity construction cost and unit capacity maintenance cost, Eline1xLine cost for IPFC station to Master line x, Eline2jLine cost, W, for line-to-line power flow controller to auxiliary control line jiFor the reliability evaluation rate of substation i, i is 1,2, … z, z is the number of substations, γ1xFor the reliability factor, gamma, of the main control line x2jThe reliability coefficient of the auxiliary control line j.
Further, the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller need to meet boundary conditions:
Figure BDA0002485564060000035
Figure BDA0002485564060000036
wherein the content of the first and second substances,
Figure BDA0002485564060000037
for installing the power flow out-of-limit coefficient, P, of the rear line r of the inter-line power flow controllerr IPFCTau is a preset negative number for the power flow of the line r after the inter-line power flow controller is installed.
Further, the evaluating the installation scheme of the inter-line power flow controller of each key section based on the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller comprises:
calculating the regulation and control capability coefficient and benefit coefficient of each key section;
and determining the installation scheme of the inter-line power flow controller with the maximum sum of the regulation and control capability coefficient and the benefit coefficient as the installation scheme of the optimal inter-line power flow controller of the regional power grid.
Another aspect of the present invention provides an inter-line moisture controller installation scenario evaluation apparatus, including:
the statistical module is used for screening out the key sections of the regional power grid, counting the power flow of each line in each key section, and determining the main control line and the auxiliary control line of each key section;
the optimization module is used for establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and the number of the first and second groups,
and the evaluation module is used for evaluating the installation scheme of the inter-line power flow controller of each key section based on the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller.
The present invention also provides a computer-readable storage medium storing one or more programs that, when executed by an electronic device including a plurality of application programs, cause the electronic device to perform operations comprising:
screening out key sections of a regional power grid, counting the power flow of each line in each key section, and determining a main control line and an auxiliary control line of each key section;
establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the interline power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and evaluating the installation scheme of the interline power flow controller of each key section based on the interline power flow controller upper-layer power regulation and control optimization model and the interline benefit optimization model.
The invention achieves the following beneficial effects: the invention solves the problem of power transfer of a circuit with heavier tide in a key section by analyzing and calculating the regional power grid in a normal operation mode and a safety and stability check mode respectively, provides an IPFC installation capacity method, solves the defect of complicated calculation in the prior art, and can rapidly and effectively program the IPFC on the circuit with the possibly out-of-limit tide in the key section.
Drawings
Fig. 1 is a simplified IPFC block diagram.
Fig. 2 is a flow chart of an evaluation method of an installation scheme of the line-to-line power flow controller.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 is a simplified IPFC structure diagram, where i and k are line numbers, and the VSC1 and the VSC2 form the IPFC.
As shown in fig. 2, an embodiment of the present invention provides a method for evaluating an installation scheme of an inter-line tidal current controller, including the following steps:
the method comprises the following steps: calculating the power grid basic power flow by applying a power flow calculation program according to the power grid power generation, load, grid structure and operation mode data; and screening out the key sections of the area network, counting the power flow of each line in each key section, and determining the main control line and the auxiliary control line of each key section.
Screening out the key section of the area network, specifically:
and under the normal operation and fault operation modes of the regional power grid, the collection of a plurality of lines bearing power exchange between the subsystems is calculated as a key section. Regional grids can present multiple critical sections.
Determining a main control line and an auxiliary control line of each key section, specifically:
under the constraint of the safe and stable guide rule of the power grid operation, calculating the load flow P of the line r in the key sectionrAnd according to the rated operation capacity P of the line rr0And calculating a load flow out-of-limit coefficient of the line:
Figure BDA0002485564060000061
n is the total number of lines in the critical section.
And sequencing the tidal current out-of-limit coefficients of the line from high to low to obtain a line tidal current operation set L:
L＝[L1 L2 … Ln]，
if the element L isrIf > 0, then LrThe corresponding circuits are main control circuits (the number of the main control circuits is more than or equal to 1); l isrThe lines corresponding to less than 0 are auxiliary control lines (the number of the auxiliary control lines is more than or equal to 1).
If L isrIf not greater than 0, then L is defined1The corresponding lines are main control lines (the number of the main control lines is 1), and the rest are auxiliary control lines.
Step two: establishing an IPFC upper-layer power regulation and control optimization model according to the capacities of corresponding ends of the main control circuit and the auxiliary control circuit;
the upper electric power regulation and control optimization model in the key section specifically comprises the following steps:
Figure BDA0002485564060000062
in the formula, k is a regulation capability coefficient, subscript 1x is a main control line x, subscript 2j is an auxiliary control line j, and delta P1xIn order to ensure the transferable tidal volume of the main control line x after the IPFC is installed, x is 1,2, … m, and m is the number of the main control lines; s1xIs the IPFC capacity of master control line x; delta P2jThe tidal volume j which can be accepted by the auxiliary control line j after the IPFC is installed is 1,2, … q, q is the number of the auxiliary control lines, and S2jWhen the capacity of the IPFC of the auxiliary control line j is equal to the capacity of the IPFC, and the delta P is not provided with the IPFC, the system needs to utilize the tidal flow transferred by the safety and stability control measure to ensure the safe and stable operation of the system.
The larger the regulating and controlling capability coefficient k is, the stronger the power flow transfer capability of the IPFC is proved to be, and the better the control effect of the IPFC is.
Step three: establishing an IPFC lower-layer benefit optimization model according to the capacities of corresponding ends of the main control circuit and the auxiliary control circuit;
one of the more important factors for IPFC applications is the reliability and cost of the power electronics, and therefore, the underlying optimization model needs to be built to determine the final capacity.
The lower benefit optimization model is as follows:
Figure BDA0002485564060000071
wherein y is the benefit coefficient, E is the economic benefit, Z is the reliability benefit, eta1、η2For economic and reliability evaluation of the coefficients, eta1+η21. Specifically, the following are shown:
Figure BDA0002485564060000072
Figure BDA0002485564060000073
equation (3) is an economic evaluation function, α and β are unit capacity construction cost and unit capacity maintenance cost, Eline1xLine cost for IPFC station to Master line x, Eline2jThe line cost of the IPFC station to the secondary line j. Equation (4) is a reliability evaluation function for determining z substations in the critical section, where i is 1,2, … z, and WiFor the reliability evaluation rate of substation i (artificially set according to the substation conditions), γ1xFor the reliability factor, gamma, of the main control line x2jThe reliability coefficient of the auxiliary control line j.
The higher the benefit coefficient y, the better the project benefit of the IPFC.
Step four: and determining boundary conditions of the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model according to the step one, and evaluating the IPFC installation scheme of each key section based on the capacity of each end of the IPFC in the key section.
Determining the boundary conditions of the model, specifically:
in order to meet the transfer of the circuit with heavier tide, the sum of the capacities of all ends of the auxiliary control circuit is more than or equal to the sum of the capacities of all ends of the main control circuit:
Figure BDA0002485564060000074
after the IPFC transfers the power flow, the power flow out-of-limit coefficient of each line needs to meet the following requirements:
Figure BDA0002485564060000081
in the formula (I), the compound is shown in the specification,
Figure BDA0002485564060000082
for installing the power flow out-of-limit coefficient, P, of the line r after IPFCr IPFCIn order to ensure the power flow of the line r after the IPFC is installed, tau is a negative number so as to ensure that each line in the critical section has certain operation margin.
Evaluating the IPFC installation scheme of each key section specifically comprises the following steps:
and carrying out scheme listing on feasible IPFC drop points and the capacity of each end in the key section, calculating each scheme by using the steps to obtain the evaluation coefficients k and y of the installation scheme of the IPFC of each key section, and finally determining the IPFC installation scheme with the maximum sum of k and y as the optimal IPFC installation scheme of the regional power grid.
In conclusion, the invention formulates a capacity hierarchical optimization design model of each end of the IPFC by selecting the key section main control line and the auxiliary control line in the normal operation mode and the stability checking mode, converts the problem of the power grid access installation capacity of the IPFC into a multi-function optimization solution problem, achieves the effects of simple calculation and high speed, and can provide reference for planning and construction of the power transmission network.
Another aspect of the present invention provides an inter-line moisture controller installation scenario evaluation apparatus, including:
the statistical module is used for screening out the key sections of the regional power grid, counting the power flow of each line in each key section, and determining the main control line and the auxiliary control line of each key section;
the optimization module is used for establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and the number of the first and second groups,
and the evaluation module is used for evaluating the installation scheme of the inter-line power flow controller of each key section based on the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller.
The present invention also provides a computer-readable storage medium storing one or more programs that, when executed by an electronic device including a plurality of application programs, cause the electronic device to perform operations comprising:
screening out key sections of a regional power grid, counting the power flow of each line in each key section, and determining a main control line and an auxiliary control line of each key section;
establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the interline power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and evaluating the installation scheme of the interline power flow controller of each key section based on the interline power flow controller upper-layer power regulation and control optimization model and the interline benefit optimization model.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (9)

1. An inter-line tidal controller installation scheme evaluation method is characterized by comprising the following steps:
screening out key sections of a regional power grid, counting the power flow of each line in each key section, and determining a main control line and an auxiliary control line of each key section;
establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the interline power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and evaluating the installation scheme of the interline power flow controller of each key section based on the interline power flow controller upper-layer power regulation and control optimization model and the interline benefit optimization model.
2. The method for evaluating the installation scheme of the inter-line tidal current controller according to claim 1, wherein the step of screening out the critical section of the regional power grid comprises the following steps:
under the normal operation and fault operation modes of the regional power grid, a set of a plurality of lines bearing power exchange between subsystems is a key section.
3. The method for evaluating the installation scheme of the inter-line tidal flow controller according to claim 1, wherein the step of counting the tidal flow of each line in each critical section and determining the main control line and the auxiliary control line of each critical section comprises the following steps:
calculating the load flow P of the line r in the key sectionr；
Calculating a load flow out-of-limit coefficient of the line according to the load flow of the line and the rated operation capacity of the line:
Figure FDA0002485564050000011
wherein L isrIs the power flow threshold coefficient, P, of the line rr0The rated operation capacity of the line r is shown, and n is the total number of the lines in the key section;
sorting the power flow out-of-limit coefficients of the line from high to low, and selecting LrSelecting L as main control line for line more than 0rThe line corresponding to < 0 is the auxiliary control line.
4. The method for evaluating the installation scheme of the inter-line moisture controller according to claim 3, wherein if L is L, L isrIf not greater than 0, then L is defined1The corresponding circuit is a main control circuit, and the other circuits are auxiliary control circuits.
5. The method for evaluating the installation scheme of the inter-line power flow controller according to claim 1, wherein the establishing of an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line comprises the following steps:
Figure FDA0002485564050000021
Figure FDA0002485564050000022
Figure FDA0002485564050000023
Figure FDA0002485564050000024
wherein k is a regulatory ability coefficient, Δ P1xIn order to install the inter-line power flow controller, the main control line x can transfer the power flow, wherein x is 1,2, … m, m is the number of the main control lines, and S is1xInter-line power flow controller capacity, Δ P, for master control line x2jThe tidal current j which can be accepted by the auxiliary control line j after the inter-line tidal current controller is installed is 1,2, … q, q is the number of the auxiliary control lines, and S2jThe capacity of the interline power flow controller of the auxiliary control line j, delta P is the power flow transferred by the system by using the safety and stability control measure when the interline power flow controller is not installed, y is a benefit coefficient, E is economic benefit, Z is reliability benefit, eta1、η2Satisfies η for economic and reliability evaluation of coefficients1+η2α and β are unit capacity construction cost and unit capacity maintenance cost, Eline1xLine cost for IPFC station to Master line x, Eline2jLine cost, W, for line-to-line power flow controller to auxiliary control line jiFor the reliability evaluation rate of substation i, i is 1,2, … z, z is the number of substations, γ1xFor the reliability factor, gamma, of the main control line x2jThe reliability coefficient of the auxiliary control line j.
6. The method for evaluating the installation scheme of the inter-line power flow controller according to claim 5, wherein an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller need to meet boundary conditions:
Figure FDA0002485564050000031
Figure FDA0002485564050000032
wherein the content of the first and second substances,
Figure FDA0002485564050000033
for installing the power flow out-of-limit coefficient, P, of the rear line r of the inter-line power flow controllerr IPFCTau is a preset negative number for the power flow of the line r after the inter-line power flow controller is installed.
7. The method for evaluating the installation scheme of the inter-line power flow controller according to claim 5, wherein the evaluating the installation scheme of the inter-line power flow controller of each critical section based on the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller comprises:
calculating the regulation and control capability coefficient and benefit coefficient of each key section;
and determining the installation scheme of the inter-line power flow controller with the maximum sum of the regulation and control capability coefficient and the benefit coefficient as the installation scheme of the optimal inter-line power flow controller of the regional power grid.
8. An inter-line moisture controller installation scenario evaluation device, comprising:
the statistical module is used for screening out the key sections of the regional power grid, counting the power flow of each line in each key section, and determining the main control line and the auxiliary control line of each key section;
the optimization module is used for establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the inter-line power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and the number of the first and second groups,
and the evaluation module is used for evaluating the installation scheme of the inter-line power flow controller of each key section based on the upper-layer power regulation and control optimization model and the lower-layer benefit optimization model of the inter-line power flow controller.
9. A computer-readable storage medium storing one or more programs which, when executed by an electronic device including a plurality of application programs, cause the electronic device to:
screening out key sections of a regional power grid, counting the power flow of each line in each key section, and determining a main control line and an auxiliary control line of each key section;
establishing an upper-layer power regulation and control optimization model and a lower-layer benefit optimization model of the interline power flow controller according to the capacities of the corresponding ends of the main control line and the auxiliary control line;
and evaluating the installation scheme of the interline power flow controller of each key section based on the interline power flow controller upper-layer power regulation and control optimization model and the interline benefit optimization model.
CN202010390548.7A 2020-05-11 2020-05-11 Method and device for evaluating installation scheme of inter-line moisture controller and electronic equipment Pending CN113642818A (en)

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