CN113839381A - Joint planning configuration method for flexible alternating current transmission device and power supply and terminal equipment - Google Patents

Joint planning configuration method for flexible alternating current transmission device and power supply and terminal equipment Download PDF

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CN113839381A
CN113839381A CN202110956829.9A CN202110956829A CN113839381A CN 113839381 A CN113839381 A CN 113839381A CN 202110956829 A CN202110956829 A CN 202110956829A CN 113839381 A CN113839381 A CN 113839381A
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袁博
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State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
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Abstract

The invention is suitable for the technical field of power grids, and provides a joint planning configuration method of a flexible alternating-current transmission device and a power supply and terminal equipment, wherein the method comprises the following steps: determining a target function and constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme, and establishing a combined configuration model according to the target function and the constraint conditions; solving the combined configuration model to obtain a plurality of planning configuration schemes; and evaluating the plurality of planning configuration schemes, and taking the planning configuration scheme with the optimal evaluation result as a target planning configuration scheme. The invention comprehensively considers the influence between the power supply planning and the flexible alternating current transmission device configuration, and jointly configures the power supply planning and the flexible alternating current transmission device to obtain the power supply planning scheme and the flexible alternating current transmission device configuration scheme, thereby improving the accuracy of the power supply planning and the flexible alternating current transmission device configuration.

Description

Joint planning configuration method for flexible alternating current transmission device and power supply and terminal equipment
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a joint planning configuration method of a flexible alternating-current power transmission device and a power supply and terminal equipment.
Background
The Flexible Alternating Current Transmission Systems (FACTS) device can quickly and flexibly change the power flow distribution of a power grid, improve the stability of the power grid, effectively improve the Transmission capacity of the power grid, reduce the cost of power Transmission, provide guarantee for developing an intelligent power grid, and has wide market prospect. The power supply planning aims at meeting the power supply of different areas, and is closely related to the power supply and the operation state of a power system. Since the configuration of the flexible ac power transmission device affects the operation state of the power system, the configuration of the flexible ac power transmission device and the power supply planning interact with each other.
In the prior art, the influence between the power supply planning and the flexible alternating-current power transmission device configuration is not considered, and the accuracy of the power supply planning and the configuration of the flexible alternating-current power transmission device is influenced.
Disclosure of Invention
In view of this, embodiments of the present invention provide a joint planning and configuration method for a flexible alternating current power transmission device and a power supply, and a terminal device, so as to solve the problem that in the prior art, mutual influence is not considered in both planning of a power supply and configuration of a flexible alternating current power transmission device, and accuracy is influenced.
A first aspect of an embodiment of the present invention provides a joint planning and configuration method for a flexible alternating current power transmission device and a power supply, including:
acquiring operating parameters of the power system;
establishing an equivalent model of the universal flexible alternating current power transmission device, and determining a decision variable of a configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device; determining decision variables of a power supply planning scheme;
determining a target function and constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme, and establishing a combined configuration model according to the target function and the constraint conditions;
solving the combined configuration model to obtain a plurality of planning configuration schemes;
evaluating the plurality of planning configuration schemes, and taking the planning configuration scheme with the optimal evaluation result as a target planning configuration scheme; the target planning configuration scheme comprises the following steps: a flexible alternating current transmission device configuration scheme and a power supply planning scheme.
A second aspect of the embodiments of the present invention provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method for joint planning and configuring of a flexible ac power transmission device and a power supply according to the first aspect of the embodiments of the present invention.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for joint planning and configuring of a flexible ac power transmission apparatus and a power supply according to the first aspect of the embodiments of the present invention are implemented.
The embodiment of the invention provides a joint planning configuration method of a flexible alternating current transmission device and a power supply and terminal equipment, wherein the method comprises the following steps: determining a target function and constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme, and establishing a combined configuration model according to the target function and the constraint conditions; solving the combined configuration model to obtain a plurality of planning configuration schemes; and evaluating the plurality of planning configuration schemes, and taking the planning configuration scheme with the optimal evaluation result as a target planning configuration scheme. According to the embodiment of the invention, the influence between the power planning and the configuration of the flexible alternating current transmission device is comprehensively considered, the power planning and the configuration of the flexible alternating current transmission device are jointly configured, a power planning scheme and a configuration scheme of the flexible alternating current transmission device are obtained, and the accuracy of the power planning and the configuration of the flexible alternating current transmission device is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an implementation of a joint planning configuration method for a flexible alternating-current power transmission device and a power supply according to an embodiment of the present invention;
FIG. 2 is an equivalent model diagram of a universal flexible AC power transmission device provided by the embodiment of the invention;
fig. 3 is a schematic diagram of a joint planning and configuration device for a flexible ac power transmission device and a power supply according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The reasonable configuration of the flexible alternating-current transmission device and the reasonable planning of the power supply have the effect of being not overlooked for ensuring the reliable and safe operation of the power grid. In the prior art, the configuration of the flexible alternating-current transmission device and the planning of a power supply are carried out separately, and the mutual influence is not considered. However, since the configuration of the flexible ac power transmission device affects the operation state of the power system and thus affects the power supply planning, and the configuration of the flexible ac power transmission device and the power supply planning affect each other, it is not scientific to plan the flexible ac power transmission device and the power supply separately and do not consider the effect of each other.
In order to solve the above problems, the embodiments of the present invention comprehensively consider the influence between power supply planning and flexible ac power transmission device configuration, establish an objective function and a constraint condition covering respective decision variables of the power supply planning and the flexible ac power transmission device configuration, and perform joint configuration on the two to obtain a power supply planning scheme and a flexible ac power transmission device configuration scheme, thereby improving the accuracy and rationality of power supply planning and flexible ac power transmission device configuration.
Referring to fig. 1, an embodiment of the present invention provides a joint planning and configuration method for a flexible ac power transmission device and a power supply, including:
s101: acquiring operating parameters of the power system;
s102: establishing an equivalent model of the universal flexible alternating current power transmission device, and determining a decision variable of a configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device; decision variables for the power planning scheme are determined.
In some embodiments, S102 may include:
s1021: and establishing an equivalent model of the universal flexible alternating current transmission device.
Flexible ac power transmission devices mainly have three types: a parallel flexible AC power transmission device, a series flexible AC power transmission device, and a comprehensive flexible AC power transmission device.
According to the characteristics of the three types of flexible alternating current power transmission devices, a universal equivalent model of the flexible alternating current power transmission device is established. The flexible alternating-current transmission device is configured on a certain section of bus on a certain line, and a and B are two end points of a line k, and refer to fig. 2 specifically.
S1022: and determining a decision variable of the configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device.
Based on the equivalent model of the flexible alternating-current power transmission device, referring to fig. 2, the decision variables to be determined by the flexible alternating-current power transmission device include: qFi、mk、φk、XFk、lkAnd diSee table 1 for details. Wherein Q isFiFor node i, the reactive power source capacity, m, of the flexible AC transmission device is configuredkVoltage amplitude variation ratio for configuring flexible alternating current transmission device on line k(generally m isk＝1)，φkArranging the voltage phase change angle, X, of the flexible AC transmission device on the line kFkConfiguring equivalent reactance of a flexible alternating current transmission device on a line k; zlkIs the equivalent impedance of line k, RLkIs the equivalent resistance, X, of line kLkIs the equivalent reactance of line k, ZLk＝RLk+jXLk；diConfiguring the state variable of the flexible AC transmission device for the node i,/kConfiguring a state variable of the flexible alternating current transmission device on a kth line; d i1 and lkA node i of the kth line is represented by 1, and a flexible alternating-current power transmission device is arranged; di0 and lk0 represents that no flexible alternating current transmission device is arranged at a line k or a node i;
the decision variables of the configuration scheme of the flexible alternating current transmission device meet the following formula:
Figure BDA0003220625040000051
wherein, the capacity Q of the available reactive power sourceFiFlexibly adjusting voltage amplitude U of endpoint AA。
Table 1 decision variable table of flexible ac power transmission device for general use
Figure BDA0003220625040000052
The universal flexible alternating current power transmission device equivalent model provided by the embodiment of the invention is suitable for analytical calculation and mathematical modeling of any single flexible alternating current power transmission device. For example, for a series-type flexible ac power transmission device, the parameter d does not existi，QFi＝0、mk＝1、φk0 corresponds to the disconnection of the parallel side element and the division of X on the series sideFkOther elements outside are short-circuited; for a parallel flexible AC transmission device, the parameter l does not existk，mk＝1、φk＝0、XFk0 corresponds to a short circuit of all the elements on the series side. The same applies toA comprehensive flexible AC transmission device. And switching among different models is not required in the configuration process, and the universality and the uniformity are good.
SDkThe capacity of the flexible alternating current transmission device configured on the kth line is an indispensable parameter when the flexible alternating current transmission device is configured, but is a two-stage technical parameter which can be determined according to QFi、mk、φkAnd XFkThe capacity of the flexible alternating current transmission device does not need to be determined in the configuration process of the flexible alternating current transmission device, and the capacity can be directly determined according to the Q determined in the target planning configuration schemeFi、mk、φkAnd XFkDetermination of four parameters, SDkThe calculation formula of (a) is as follows:
Figure BDA0003220625040000061
from the above, the decision variables of the configuration scheme of the flexible ac power transmission device include six parameters in table 1. At the same time, SDkSeven parameters (Q) are indispensable for the configuration of the flexible AC power transmission device, together with the six parametersFi、mk、φk、XFk、lk、diAnd SDk) And the flexible alternating current transmission devices form a flexible alternating current transmission device configuration scheme together.
S1023: decision variables for the power planning scheme are determined.
Decision variables for the power planning scheme include: the position and capacity (a) of the power supplyi、Pi G) And two parameters form a scheme for power supply planning.
Wherein, the access position aiIndicating whether the node i has a newly-built power supply (i.e. the state variable of the newly-built power supply at the node i), ai1 denotes that there is a new power supply at node i, ai0 means that there is no newly built power supply at node i. Pi GThe active capacity of the newly-built power supply at the node i is a continuous real number larger than 0.
S103: determining a target function and constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme, and establishing a combined configuration model according to the target function and the constraint conditions.
Based on the above analysis, the flexible ac transmission device has 7 parameters configured and 2 parameters of the power supply plan, for a total of 9 parameters (Q)Fi、mk、φk、XFk、lk、di、ai、Pi GAnd SDk) Jointly form a joint configuration scheme (the solving process does not consider SDk). In the embodiment of the invention, the above-mentioned S is usedDkThe other 8 parameters (Q)Fi、mk、φk、XFk、lk、di、ai、Pi G) And as a decision variable, determining a target function and a constraint condition by combining the operation parameters of the power system, establishing a combined configuration model of the power supply and the flexible alternating-current power transmission device, and comprehensively considering the relationship between the power supply and the flexible alternating-current power transmission device.
S104: and solving the combined configuration model to obtain a plurality of planning configuration schemes.
S105: evaluating the plurality of planning configuration schemes, and taking the planning configuration scheme with the optimal evaluation result as a target planning configuration scheme; the target planning configuration scheme comprises the following steps: a flexible alternating current transmission device configuration scheme and a power supply planning scheme.
And solving the combined configuration model by adopting an artificial intelligence algorithm, if the solved result is a plurality of planning schemes, evaluating the plurality of planning schemes by a certain evaluation index, and selecting the optimal planning configuration scheme as a target planning configuration scheme. For example, the evaluation index may be a transmission margin of the power transmission section. And selecting the scheme with the maximum transmission margin of the power transmission section as a target planning configuration scheme.
The embodiment of the invention comprehensively considers the influence between power supply planning and flexible alternating current transmission device configuration, and jointly configures the power supply planning and the flexible alternating current transmission device, thereby improving the accuracy of power supply planning and the configuration of the flexible alternating current transmission device. Meanwhile, the embodiment of the invention can obtain a power supply planning scheme and a configuration scheme of the flexible alternating current transmission device at the same time, and the planning efficiency is higher.
In some embodiments, S103 may include:
s1031: determining a plurality of evaluation indexes of the power system according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme;
s1032: an objective function is determined from the plurality of evaluation indices.
In some embodiments, the plurality of evaluation indicators includes: configuring economic cost, life cycle cost, power flow distribution balance and node voltage deviation;
the objective function may include:
min{λ1δ1(CO+LCC)+λ2(λ3δ3BA+λ4δ4DE)}
λ1+λ2＝1
λ3+λ4＝1
wherein, CO is the configuration economic cost, LCC is the total life cycle cost, BA is the tidal current distribution equilibrium degree, DE is the node voltage deviation degree, lambda1、λ2、λ3、λ4Is a weight coefficient, δ1、δ3、δ4Are normalized coefficients.
In some embodiments, λ1＝λ2＝0.5，λ3＝0.7，λ4＝0.3。
Specifically, each weight coefficient can be set according to the actual application requirement.
In some embodiments, the calculation formula for the configuration economic cost CO may be:
Figure BDA0003220625040000081
the lowest cost is always the main target of various engineering construction in the power system, and is different from the configuration cost of the flexible alternating current power transmission device in the prior art.
The calculation formula of the full life cycle cost LCC can be as follows:
Figure BDA0003220625040000082
Figure BDA0003220625040000083
the lowest cost has also been a major goal of flexible ac power transmission device configurations in power systems. In the prior art, the lowest cost in the configuration process of the flexible alternating-current transmission device only considers the configuration cost, and does not consider the life cycle. The embodiment of the invention constructs the configuration target of the flexible alternating current transmission device from the perspective of the whole life cycle, considers the economy of power maintenance and flexible alternating current transmission device maintenance, and has time comprehensiveness and type comprehensiveness. Meanwhile, the operation benefit of the power system is determined according to the network loss variation of the operation of the power system in the embodiment of the invention
Figure BDA0003220625040000084
The objective function also takes into account the amount of variation in the grid loss of the power system.
Wherein,
Figure BDA0003220625040000085
and Δ PkThe calculation formula of (c) may be:
Figure BDA0003220625040000086
the calculation formula of the power flow distribution balance degree BA can be as follows:
Figure BDA0003220625040000091
BA represents the active power flow distribution equilibrium degree in the power system and represents the fluctuation of actual transmission power compared with average input power.
The calculation formula of the node voltage deviation degree DE may be:
Figure BDA0003220625040000092
wherein, CFkOne-off base cost, C, of configuring a flexible AC transmission device on the kth lineGiOne-time base cost for building a power supply at node i; wherein, CFkAnd CGiThe method mainly comprises the steps of construction land acquisition, construction cost, one-time installation cost and the like, and is a constant determined according to different construction conditions. SDkFor capacity, P, of flexible AC transmission means arranged on the k-th linei GThe active capacity of a power supply is newly built at a node i; c. CFConstruction cost of flexible AC transmission apparatus per unit capacity, cGThe construction cost of a unit capacity power supply; lkFor configuring the state variable of the flexible AC transmission device on the k-th line,/k1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; a isiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built;
Figure BDA0003220625040000093
for the operating and maintenance costs of all flexible ac transmission devices in year y,
Figure BDA0003220625040000094
the operating and maintenance costs of all newly built power supplies in year y,
Figure BDA0003220625040000095
the operation benefit of the power system brought about in the y year; c. CMIs the economic cost per unit grid loss in the power system; y ═1,2, …, Y, Y is the total years of the full life cycle;
Figure BDA0003220625040000096
active power loss, delta P, for the k-th line before the flexible AC transmission meanskThe active power loss of the kth line after the flexible alternating current transmission device is configured; pkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxE () is the mean value of the maximum power of the kth line; k is 1,2, …, and L is the total number of lines in the power system; u shapeiFor configuring the quiescent voltage value, U, of the rear node i of a flexible AC transmission devicei-NNIs the rated voltage value of the node i; i is 1,2, …, N is the total number of nodes in the power system.
The method and the device have the advantages that the economic cost and the whole life cycle cost are configured as economic indexes, the power flow distribution balance degree and the node voltage deviation degree are technical indexes, the economic indexes and the technical indexes are comprehensively considered to determine the objective function according to the influence of power supply planning and flexible alternating current transmission device configuration on the power system, and the objective function is more comprehensive and reasonable.
In some embodiments, the calculation formula of each normalized coefficient may be:
Figure BDA0003220625040000101
Figure BDA0003220625040000102
Figure BDA0003220625040000103
wherein,
Figure BDA0003220625040000104
for the maximum cost budget of a newly built power supply,
Figure BDA0003220625040000105
a maximum cost budget configured for the flexible ac transmission device,
Figure BDA0003220625040000106
for the maximum possible maintenance cost of a newly built power supply,
Figure BDA0003220625040000107
maximum possible maintenance cost for a flexible AC transmission device configuration, cMFor the economic cost of the unit grid loss in the power system,
Figure BDA0003220625040000108
the upper limit value of the total network loss in the power system; l is the total number of lines in the power system; n is the total number of nodes in the power system.
In some embodiments, S103 may further include:
s1033: and determining constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme.
In some embodiments, the constraints may include: the method comprises the following steps of equality constraint of the operation state of the power system, inequality constraint of the operation state of the power system, configuration condition constraint of the flexible alternating-current power transmission device and power supply planning condition constraint.
In some embodiments, the equality constraints on the operating state of the power system may include:
Figure BDA0003220625040000111
wherein, aiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built; pi GThe active capacity of a power supply is newly built at a node i; qi GThe reactive capacity of a power supply is newly built at a node i; pi G0Is at node iWith active capacity of the power supply, Qi G0The reactive capacity of the original power supply at the node i is obtained; pi LFor the active load at node i, Qi LIs the reactive load at node i; qFiConfiguring the reactive power source capacity of the flexible alternating current transmission device for the node i; u shapeiIs the voltage amplitude at node i, UjIs the magnitude of the voltage at node j, θiIs the phase of the voltage at node i, θjIs the voltage phase at node j; diConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device;
Figure BDA0003220625040000112
and
Figure BDA0003220625040000113
respectively a node admittance matrix Y of the power system after the flexible AC power transmission device is configured(HP)Row (i) and column (j)
Figure BDA0003220625040000114
Real and imaginary parts of, i.e.
Figure BDA0003220625040000115
PkActive power, U, after configuring flexible AC transmission means for the kth linekAVoltage amplitude, U, of head end node AkBThe voltage amplitude of the tail node B, thetakAVoltage phase of head end node A, θkBVoltage phase for tail end node B; xFkConfiguring equivalent reactance, X, of flexible AC transmission means on line kLkIs the equivalent reactance of line k, phikConfiguring a voltage phase change angle of a flexible alternating current transmission device on a line k; lkFor configuring the state variable of the flexible AC transmission device on the k-th line,/k1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; k ═1,2, …, L, L is the total number of lines in the power system; 1,2, …, N being the total number of nodes in the power system; j is 1,2, …, N is the total number of nodes in the power system;
wherein, Y(HP)Can be determined according to the general calculation method of the node admittance matrix in the power system in the prior art. But in solving for Y(HP)Considering equivalent reactance X in flexible AC transmission deviceFkProportional to the voltage amplitude mkI.e. Y(HP)＝f(Y,XFk,mk) (ii) a And Y is a node admittance matrix of the original power system.
In the embodiment of the invention, the newly-built power supplies of different nodes are considered in the equation constraint of the operation state of the power system, the newly-built power supplies are not considered in the configuration method of the flexible alternating-current power transmission device in the prior art, and the technical parameters of the newly-built power supplies are also the output parameters of the power supply planning scheme.
Inequality constraints on power system operating conditions may include:
Figure BDA0003220625040000121
wherein, PkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxMaximum power of kth line;
Figure BDA0003220625040000122
for the flow of the kth line after the q-th line fault,
Figure BDA0003220625040000123
is the voltage amplitude at node i after the q-th line fault, Ui-minIs the lower limit of the voltage amplitude at node i, Ui-maxIs the upper limit of the voltage amplitude at node i, Δ PkIn order to configure the active power loss of the kth line after the flexible alternating current transmission device,
Figure BDA0003220625040000124
is the upper limit value of the total network loss in the power system,and epsilon is the reactive power coefficient of the power supply.
All parameters in the inequality constraints of the operating state of the power system provided by the embodiment of the invention are calculated by the power system after power supply planning is considered, and the factors are not considered in the configuration method of the flexible alternating-current power transmission device in the prior art. Meanwhile, the inequality constraint provided by the embodiment of the invention also considers the coefficient relation between the reactive power and the active power of the power output, the maximum constraint of the system active network loss and the like, so that the method is more comprehensive.
The flexible ac power transmission device configuration condition constraints may include:
Figure BDA0003220625040000131
wherein d isiConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device; kA is a head end node of the line k, and kB is a tail end node of the line k; m iskConfiguring a voltage amplitude value change proportion of a flexible alternating current transmission device on a line k; sDkCapacity of flexible AC transmission means arranged for the k-th line, cFThe construction cost of a unit capacity flexible alternating current transmission device;
Figure BDA0003220625040000132
a maximum cost budget configured for the flexible ac transmission device,
Figure BDA0003220625040000133
a maximum possible maintenance cost configured for the flexible ac transmission device;
Figure BDA0003220625040000134
for the operation and maintenance cost of all flexible alternating current transmission devices in the Y year, Y is 1,2, …, and Y is the total year of the whole life cycle;
power supply planning constraints may include:
Figure BDA0003220625040000135
wherein,
Figure BDA0003220625040000136
for the total capacity requirement of the power supply in the power system, cGIn order to reduce the construction cost of a unit capacity power supply,
Figure BDA0003220625040000137
the operating and maintenance costs of all newly built power supplies in year y,
Figure BDA0003220625040000138
for the maximum possible maintenance cost of a newly built power supply,
Figure BDA0003220625040000141
the maximum cost budget of the newly built power supply is obtained. Wherein, ai+diThe {0,1} indicates that a flexible ac power transmission device is arranged at the node i or a newly-built power supply is arranged.
In the embodiment of the invention, the flexible alternating current transmission device is considered in the constraint of power supply planning conditions, the power supply planning is also considered in the constraint of configuration conditions of the flexible alternating current transmission device, the mutual influence between the flexible alternating current transmission device and the power supply planning is comprehensively considered, and the constraint conditions are more comprehensive and accurate.
When calculating each parameter in the objective function and the constraint condition, the most severe operating condition of the power system is usually selected as the basic condition, for example, the predicted operating condition of the power system at the annual maximum load time may be selected.
In some embodiments, S103 may further include:
s1034: and establishing a joint configuration model according to the objective function and the constraint condition.
In the embodiment of the invention, the influence between the configuration of the flexible alternating current power transmission device and the power supply planning is comprehensively considered, the objective function and the constraint condition are established, and the objective function and the constraint condition jointly form a combined configuration model.
Further, due to the connectionThe combined configuration model includes 8 decision variables (Q)Fi、mk、φk、XFk、lk、di、ai、Pi G) Solving the model may result in multiple planning configurations.
Thus, based on the above, in some embodiments, S105 may comprise:
s1051: for each planning configuration scheme, determining the transmission margin of the power transmission section under the planning configuration scheme according to the planning configuration scheme;
s1052: and taking the planning configuration scheme with the maximum transmission margin of the power transmission section as a target planning configuration scheme.
In some embodiments, the calculation formula of the transmission margin of the power transmission section may be:
Figure BDA0003220625040000142
wherein, VrIs the set of all lines in the R-th power transmission section, R is the number of power transmission sections in the power system, R is 1,2, …, R, PqActive power of the q-th line, Pq-maxThe maximum power of the q-th line.
The transmission margin of the power transmission section represents the transmission capability of the section of the power system, is used for evaluating the power transmission capability of a power grid, and is obtained by calculation after a flexible alternating-current power transmission device and a power supply are configured. In the embodiment of the invention, a plurality of schemes can be obtained when the combined configuration model is solved by adopting an artificial intelligence algorithm (such as an ant colony algorithm), and each scheme is evaluated through the transmission margin of a power transmission section to obtain an optimal planning configuration scheme which enables the power transmission capacity of a power grid to be strongest.
Firstly, establishing a universal flexible alternating current power transmission device equivalent model suitable for various flexible alternating current power transmission devices, and determining technical parameters in a combined configuration scheme of power supply planning and flexible alternating current power transmission device configuration based on the equivalent model; then, constructing a technical index and an economic index which can represent the configuration effect of the power supply planning and the flexible alternating-current transmission device, and providing a target function of a combined configuration model; simultaneously, according to a power supply planning scheme, a flexible alternating current transmission device configuration scheme and a logic relation between various indexes of the power system operation after the scheme is implemented, providing a constraint condition of a combined configuration model; and finally, solving a combined configuration model formed by the objective function and the constraint condition through an artificial intelligence algorithm to obtain a plurality of planning configuration schemes, and evaluating and screening the schemes to obtain the target planning configuration scheme. In the embodiment of the invention, the mutual influence between the power supply planning scheme and the flexible alternating current transmission device configuration scheme is considered for the first time, and a combined configuration model integrating the power supply planning scheme and the flexible alternating current transmission device configuration scheme is provided, so that the power supply planning scheme and the flexible alternating current transmission device configuration scheme can be simultaneously obtained, and the scientificity of the respective single scheme in planning is improved; the method comprises the steps of establishing a universal flexible alternating current power transmission device equivalent model suitable for various flexible alternating current power transmission devices, and realizing universal configuration of the various flexible alternating current power transmission devices while considering power supply planning.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Corresponding to the above embodiment, referring to fig. 3, an embodiment of the present invention further provides a joint planning and configuration device for a flexible ac power transmission device and a power supply, including:
a parameter obtaining module 21, configured to obtain an operating parameter of the power system;
the decision variable determining module 22 is used for establishing an equivalent model of the universal flexible alternating current power transmission device and determining a decision variable of a configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device; determining decision variables of a power supply planning scheme;
the joint configuration model establishing module 23 is configured to determine an objective function and a constraint condition according to an operating parameter of the power system, an equivalent model of the universal flexible alternating current power transmission device, a decision variable of a configuration scheme of the flexible alternating current power transmission device, and a decision variable of a power supply planning scheme, and establish a joint configuration model according to the objective function and the constraint condition;
the model solving module 24 is used for solving the combined configuration model to obtain a plurality of planning configuration schemes;
the plan output module 25 is configured to evaluate the multiple planning and configuration schemes, and use the planning and configuration scheme with the optimal evaluation result as a target planning and configuration scheme; the target planning configuration scheme comprises the following steps: a flexible alternating current transmission device configuration scheme and a power supply planning scheme.
In some embodiments, the decision variable determination module 22 may include:
and the equivalent model establishing unit 221 is used for establishing an equivalent model of the universal flexible alternating current power transmission device.
A first decision variable determining unit 222, configured to determine a decision variable of the configuration scheme of the flexible alternating current power transmission apparatus according to the equivalent model of the universal flexible alternating current power transmission apparatus.
A second decision variable determination unit 223, configured to determine a decision variable of the power planning scheme.
In some embodiments, the joint configuration model building module 23 may include:
an evaluation parameter determination unit 231, configured to determine a plurality of evaluation indexes of the power system according to the operation parameters of the power system, the equivalent model of the universal flexible alternating-current power transmission device, the configuration variables of the flexible alternating-current power transmission device, and the power supply planning variables;
an objective function determination unit 232 for determining an objective function according to the plurality of evaluation indexes.
In some embodiments, the plurality of evaluation indicators includes: configuring economic cost, life cycle cost, power flow distribution balance and node voltage deviation;
the objective function may include:
min{λ1δ1(CO+LCC)+λ2(λ3δ3BA+λ4δ4DE)}
λ1+λ2＝1
λ3+λ4＝1
wherein CO is the configuration economyThe LCC is the life cycle cost, BA is the tidal current distribution equilibrium degree, DE is the node voltage deviation degree, lambda1、λ2、λ3、λ4Is a weight coefficient, δ1、δ3、δ4Are normalized coefficients.
In some embodiments, the calculation formula for the configuration economic cost CO may be:
Figure BDA0003220625040000171
the calculation formula of the full life cycle cost LCC can be as follows:
Figure BDA0003220625040000172
Figure BDA0003220625040000173
the calculation formula of the power flow distribution balance degree BA can be as follows:
Figure BDA0003220625040000174
the calculation formula of the node voltage deviation degree DE may be:
Figure BDA0003220625040000175
wherein, CFkOne-off base cost, C, of configuring a flexible AC transmission device on the kth lineGiOne-time base cost for building a power supply at node i; sDkFor capacity, P, of flexible AC transmission means arranged on the k-th linei GThe active capacity of a power supply is newly built at a node i; c. CFConstruction cost of flexible AC transmission apparatus per unit capacity, cGThe construction cost of a unit capacity power supply; lkIs at the same timeConfiguring state variable l of flexible AC transmission device on kth linek1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; a isiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built;
Figure BDA0003220625040000176
for the operating and maintenance costs of all flexible ac transmission devices in year y,
Figure BDA0003220625040000177
the operating and maintenance costs of all newly built power supplies in year y,
Figure BDA0003220625040000178
the operation benefit of the power system brought about in the y year; c. CMIs the economic cost per unit grid loss in the power system; y is 1,2, …, Y is the total years of the life cycle;
Figure BDA0003220625040000179
active power loss, delta P, for the k-th line before the flexible AC transmission meanskThe active power loss of the kth line after the flexible alternating current transmission device is configured; pkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxE () is the mean value of the maximum power of the kth line; k is 1,2, …, and L is the total number of lines in the power system; u shapeiFor configuring the quiescent voltage value, U, of the rear node i of a flexible AC transmission devicei-NNIs the rated voltage value of the node i; i is 1,2, …, N is the total number of nodes in the power system.
In some embodiments, the calculation formula of each normalized coefficient may be:
Figure BDA0003220625040000181
Figure BDA0003220625040000182
Figure BDA0003220625040000183
wherein,
Figure BDA0003220625040000184
for the maximum cost budget of a newly built power supply,
Figure BDA0003220625040000185
a maximum cost budget configured for the flexible ac transmission device,
Figure BDA0003220625040000186
for the maximum possible maintenance cost of a newly built power supply,
Figure BDA0003220625040000187
maximum possible maintenance cost for a flexible AC transmission device configuration, cMFor the economic cost of the unit grid loss in the power system,
Figure BDA0003220625040000188
the upper limit value of the total network loss in the power system; l is the total number of lines in the power system; n is the total number of nodes in the power system.
In some embodiments, the joint configuration model building module 23 may further include:
and a constraint condition determining unit 233, configured to determine a constraint condition according to an operating parameter of the power system, an equivalent model of the universal flexible alternating-current power transmission device, a decision variable of the configuration scheme, and a decision variable of the power planning scheme.
In some embodiments, the constraints may include: the method comprises the following steps of equality constraint of the operation state of the power system, inequality constraint of the operation state of the power system, configuration condition constraint of the flexible alternating-current power transmission device and power supply planning condition constraint.
In some embodiments, the equality constraints on the operating state of the power system may include:
Figure BDA0003220625040000191
wherein, aiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built; pi GThe active capacity of a power supply is newly built at a node i; qi GThe reactive capacity of a power supply is newly built at a node i; pi G0Is the active capacity, Q, of the original power supply at node ii G0The reactive capacity of the original power supply at the node i is obtained; pi LFor the active load at node i, Qi LIs the reactive load at node i; qFiConfiguring the reactive power source capacity of the flexible alternating current transmission device for the node i; u shapeiIs the voltage amplitude at node i, UjIs the magnitude of the voltage at node j, θiIs the phase of the voltage at node i, θjIs the voltage phase at node j; diConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device;
Figure BDA0003220625040000192
and
Figure BDA0003220625040000193
respectively a node admittance matrix Y of the power system after the flexible AC power transmission device is configured(HP)Row (i) and column (j)
Figure BDA0003220625040000194
Real and imaginary parts of, i.e.
Figure BDA0003220625040000195
PkConfiguring flexible services for kth lineActive power after current transmission device, UkAVoltage amplitude, U, of head end node AkBThe voltage amplitude of the tail node B, thetakAVoltage phase of head end node A, θkBVoltage phase for tail end node B; xFkConfiguring equivalent reactance, X, of flexible AC transmission means on line kLkIs the equivalent reactance of line k, phikConfiguring a voltage phase change angle of a flexible alternating current transmission device on a line k; lkFor configuring the state variable of the flexible AC transmission device on the k-th line,/k1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; k is 1,2, …, and L is the total number of lines in the power system; 1,2, …, N being the total number of nodes in the power system; j is 1,2, …, N is the total number of nodes in the power system;
inequality constraints on power system operating conditions may include:
Figure BDA0003220625040000201
wherein, PkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxMaximum power of kth line;
Figure BDA0003220625040000202
for the flow of the kth line after the q-th line fault,
Figure BDA0003220625040000205
is the voltage amplitude at node i after the q-th line fault, Ui-minIs the lower limit of the voltage amplitude at node i, Ui-maxIs the upper limit of the voltage amplitude at node i, Δ PkIn order to configure the active power loss of the kth line after the flexible alternating current transmission device,
Figure BDA0003220625040000203
is the upper limit value of total network loss in the power system, and epsilon is the reactive power output coefficient of the power supply；
The flexible ac power transmission device configuration condition constraints may include:
Figure BDA0003220625040000204
wherein d isiConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device; kA is a head end node of the line k, and kB is a tail end node of the line k; m iskConfiguring a voltage amplitude value change proportion of a flexible alternating current transmission device on a line k; sDkCapacity of flexible AC transmission means arranged for the k-th line, cFThe construction cost of a unit capacity flexible alternating current transmission device;
Figure BDA0003220625040000211
a maximum cost budget configured for the flexible ac transmission device,
Figure BDA0003220625040000212
a maximum possible maintenance cost configured for the flexible ac transmission device;
Figure BDA0003220625040000213
for the operation and maintenance cost of all flexible alternating current transmission devices in the Y year, Y is 1,2, …, and Y is the total year of the whole life cycle;
power supply planning constraints may include:
Figure BDA0003220625040000214
wherein,
Figure BDA0003220625040000215
for the total capacity requirement of the power supply in the power system, cGIn order to reduce the construction cost of a unit capacity power supply,
Figure BDA0003220625040000216
the operating and maintenance costs of all newly built power supplies in year y,
Figure BDA0003220625040000217
for the maximum possible maintenance cost of a newly built power supply,
Figure BDA0003220625040000218
the maximum cost budget of the newly built power supply is obtained.
In some embodiments, the joint configuration model building module 23 may further include:
the model building unit 234 is configured to build a joint configuration model according to the objective function and the constraint condition.
In some embodiments, the recipe output module 25 may include:
a transmission margin evaluation unit 251, configured to determine, for each planning configuration scheme, a transmission margin of a power transmission section under the planning configuration scheme according to the planning configuration scheme;
and an optimal scheme output unit 252, configured to take the planning configuration scheme with the largest transmission margin of the power transmission section as the target planning configuration scheme.
In some embodiments, the calculation formula of the transmission margin of the power transmission section may be:
Figure BDA0003220625040000219
wherein, VrIs the set of all lines in the R-th power transmission section, R is the number of power transmission sections in the power system, R is 1,2, …, R, PqActive power of the q-th line, Pq-maxThe maximum power of the q-th line.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the terminal device is divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 4 of this embodiment includes: one or more processors 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processors 40. The processor 40 executes the computer program 42 to implement the steps in the above-mentioned method for jointly planning and configuring the flexible ac power transmission apparatus and the power supply, such as the steps S101 to S105 shown in fig. 1. Alternatively, the processor 40 executes the computer program 42 to implement the functions of the modules/units in the above-mentioned flexible ac power transmission device and power supply joint planning and configuration device embodiment, for example, the functions of the modules 21 to 25 shown in fig. 3.
Illustratively, the computer program 42 may be divided into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to accomplish the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 42 in the terminal device 4. For example, the computer program 42 may be partitioned into the parameter acquisition module 21, the decision variable determination module 22, the joint configuration model building module 23, the model solving module 24, and the scenario output module 25.
A parameter obtaining module 21, configured to obtain an operating parameter of the power system;
the decision variable determining module 22 is used for establishing an equivalent model of the universal flexible alternating current power transmission device and determining a decision variable of a configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device; determining decision variables of a power supply planning scheme;
the joint configuration model establishing module 23 is configured to determine an objective function and a constraint condition according to an operating parameter of the power system, an equivalent model of the universal flexible alternating current power transmission device, a decision variable of a configuration scheme of the flexible alternating current power transmission device, and a decision variable of a power supply planning scheme, and establish a joint configuration model according to the objective function and the constraint condition;
the model solving module 24 is used for solving the combined configuration model to obtain a plurality of planning configuration schemes;
the plan output module 25 is configured to evaluate the multiple planning and configuration schemes, and use the planning and configuration scheme with the optimal evaluation result as a target planning and configuration scheme; the target planning configuration scheme comprises the following steps: a flexible alternating current transmission device configuration scheme and a power supply planning scheme.
Other modules or units are not described in detail herein.
Terminal device 4 includes, but is not limited to, processor 40, memory 41. Those skilled in the art will appreciate that fig. 4 is only one example of a terminal device and does not constitute a limitation of terminal device 4 and may include more or fewer components than shown, or combine certain components, or different components, e.g., terminal device 4 may also include input devices, output devices, network access devices, buses, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 41 may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory 41 may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory 41 may also include both an internal storage unit of the terminal device and an external storage device. The memory 41 is used for storing the computer program 42 and other programs and data required by the terminal device. The memory 41 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed terminal device and method may be implemented in other ways. For example, the above-described terminal device embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments described above may be implemented by a computer program, which is stored in a computer readable storage medium and used by a processor to implement the steps of the embodiments of the methods described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A joint planning and configuration method for a flexible alternating current transmission device and a power supply is characterized by comprising the following steps:
acquiring operating parameters of the power system; establishing an equivalent model of a universal flexible alternating current power transmission device, and determining a decision variable of a configuration scheme of the flexible alternating current power transmission device according to the equivalent model of the universal flexible alternating current power transmission device; determining decision variables of a power supply planning scheme; determining a target function and a constraint condition according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme, and establishing a combined configuration model according to the target function and the constraint condition; solving the combined configuration model to obtain a plurality of planning configuration schemes; evaluating the plurality of planning configuration schemes, and taking the planning configuration scheme with the optimal evaluation result as a target planning configuration scheme; wherein the target planning configuration scheme comprises: a flexible alternating current transmission device configuration scheme and a power supply planning scheme.
2. The method according to claim 1, wherein the determining an objective function and constraint conditions according to the operating parameters of the power system, the equivalent model of the universal flexible ac power transmission device, the decision variables of the flexible ac power transmission device configuration scheme, and the decision variables of the power supply planning scheme comprises:
determining a plurality of evaluation indexes of the power system according to the operating parameters of the power system, the equivalent model of the universal flexible alternating current transmission device, the decision variables of the configuration scheme of the flexible alternating current transmission device and the decision variables of the power planning scheme;
and determining the objective function according to the plurality of evaluation indexes.
3. The method according to claim 2, wherein the evaluation indicators include: configuring economic cost, life cycle cost, power flow distribution balance and node voltage deviation;
the objective function includes:
min{λ1δ1(CO+LCC)+λ2(λ3δ3BA+λ4δ4DE)}
λ1+λ2＝1
λ3+λ4＝1
wherein CO is the configuration economic cost, LCC is the full life cycle cost, BA is the tidal current distribution equilibrium degree, DE is the node voltage deviation degree, and lambda1、λ2、λ3、λ4Is a weight coefficient, δ1、δ3、δ4Are normalized coefficients.
4. A method for joint planning and configuration of a flexible ac power transmission installation and a power supply according to claim 3, wherein the economic cost CO of configuration is calculated by the formula:
Figure FDA0003220625030000021
the calculation formula of the full life cycle cost LCC is as follows:
Figure FDA0003220625030000022
Figure FDA0003220625030000023
the calculation formula of the power flow distribution balance degree BA is as follows:
Figure FDA0003220625030000024
the calculation formula of the node voltage deviation degree DE is as follows:
Figure FDA0003220625030000025
wherein, CFkOne-off base cost, C, of configuring a flexible AC transmission device on the kth lineGiOne-time base cost for building a power supply at node i; sDkFor capacity, P, of flexible AC transmission means arranged on the k-th linei GThe active capacity of a power supply is newly built at a node i; c. CFConstruction cost of flexible AC transmission apparatus per unit capacity, cGThe construction cost of a unit capacity power supply; lkFor configuring the state variable of the flexible AC transmission device on the k-th line,/k1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; a isiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built;
Figure FDA0003220625030000026
for the operating and maintenance costs of all flexible ac transmission devices in year y,
Figure FDA0003220625030000031
the operating and maintenance costs of all newly built power supplies in year y,
Figure FDA0003220625030000032
the operation benefit of the power system brought about in the y year; c. CMIs the economic cost per unit grid loss in the power system; y is 1,2, …, Y is the total years of the life cycle;
Figure FDA0003220625030000033
active power loss, delta P, for the k-th line before the flexible AC transmission meanskThe active power loss of the kth line after the flexible alternating current transmission device is configured; pkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxE () is the mean value of the maximum power of the kth line; k is 1,2, …, and L is the total number of lines in the power system; u shapeiFor configuring the quiescent voltage value, U, of the rear node i of a flexible AC transmission devicei-NNIs the rated voltage value of the node i; i is 1,2, …, N is the total number of nodes in the power system.
5. A method for joint planning and configuration of a flexible ac power transmission installation and a power supply according to claim 3, wherein the calculation formula of each normalization coefficient is:
Figure FDA0003220625030000034
Figure FDA0003220625030000035
Figure FDA0003220625030000036
wherein,
Figure FDA0003220625030000037
for the maximum cost budget of a newly built power supply,
Figure FDA0003220625030000038
a maximum cost budget configured for the flexible ac transmission device,
Figure FDA0003220625030000039
for the maximum possible maintenance cost of a newly built power supply,
Figure FDA00032206250300000310
maximum possible maintenance cost for a flexible AC transmission device configuration, cMFor the economic cost of the unit grid loss in the power system,
Figure FDA00032206250300000311
the upper limit value of the total network loss in the power system; l is the total number of lines in the power system; n is the total number of nodes in the power system.
6. The method according to claim 1, wherein the constraints include: the method comprises the following steps of equality constraint of the operation state of the power system, inequality constraint of the operation state of the power system, configuration condition constraint of the flexible alternating-current power transmission device and power supply planning condition constraint.
7. The method according to claim 6, wherein the equation constraints on the operating states of the power system comprise:
Figure FDA0003220625030000041
wherein, aiTo newly build a state variable of a power supply at node i, ai1 denotes that a power supply is newly built at the node i, and aiWhen the node i is not newly built, the power supply is not built; pi GThe active capacity of a power supply is newly built at a node i;
Figure FDA0003220625030000042
the reactive capacity of a power supply is newly built at a node i; pi G0Is the active capacity of the original power supply at node i,
Figure FDA0003220625030000043
the reactive capacity of the original power supply at the node i is obtained; pi LFor the active load at the node i,
Figure FDA0003220625030000044
is the reactive load at node i; qFiConfiguring the reactive power source capacity of the flexible alternating current transmission device for the node i; u shapeiIs the voltage amplitude at node i, UjIs the magnitude of the voltage at node j, θiIs the phase of the voltage at node i, θjIs the voltage phase at node j; diConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device;
Figure FDA0003220625030000045
and
Figure FDA0003220625030000046
respectively a node admittance matrix Y of the power system after the flexible AC power transmission device is configured(HP)Row (i) and column (j)
Figure FDA0003220625030000047
Real and imaginary parts of, i.e.
Figure FDA0003220625030000048
PkActive power, U, after configuring flexible AC transmission means for the kth linekAVoltage amplitude, U, of head end node AkBThe voltage amplitude of the tail node B, thetakAVoltage phase of head end node A, θkBVoltage phase for tail end node B; xFkConfiguring equivalent reactance, X, of flexible AC transmission means on line kLkIs the equivalent reactance of line k, phikConfiguring a voltage phase change angle of a flexible alternating current transmission device on a line k; lkFor configuring the state variable of the flexible AC transmission device on the k-th line,/k1 denotes a line k on which a flexible ac power transmission device is disposed, lk0 represents that no flexible alternating current transmission device is arranged on the line k; k is 1,2, …, and L is the total number of lines in the power system; 1,2, …, N being the total number of nodes in the power system; j is 1,2, …, N is the total number of nodes in the power system;
the inequality constraints of the power system operating states include:
Figure FDA0003220625030000051
wherein, PkActive power, P, after the arrangement of flexible AC transmission means for the k-th linek-maxMaximum power of kth line;
Figure FDA0003220625030000052
for the flow of the kth line after the q-th line fault,
Figure FDA0003220625030000053
is the voltage amplitude at node i after the q-th line fault, Ui-minIs the lower limit of the voltage amplitude at node i, Ui-maxIs the upper limit of the voltage amplitude at node i, Δ PkIn order to configure the active power loss of the kth line after the flexible alternating current transmission device,
Figure FDA0003220625030000054
the power supply is an upper limit value of total network loss in the power system, and epsilon is a reactive power output coefficient of the power supply;
the flexible alternating current transmission device configuration condition constraints comprise:
Figure FDA0003220625030000055
wherein d isiConfiguring the state variable of the flexible AC transmission device for node i, diWhere 1 denotes that node i is provided with a flexible ac power transmission device, di0 indicates that the node i is not provided with the flexible alternating current transmission device; kA is a head end node of the line k, and kB is a tail end node of the line k; m iskConfiguring a voltage amplitude value change proportion of a flexible alternating current transmission device on a line k; sDkCapacity of flexible AC transmission means arranged for the k-th line, cFThe construction cost of a unit capacity flexible alternating current transmission device;
Figure FDA0003220625030000056
a maximum cost budget configured for the flexible ac transmission device,
Figure FDA0003220625030000061
a maximum possible maintenance cost configured for the flexible ac transmission device;
Figure FDA0003220625030000062
for the operation and maintenance cost of all flexible alternating current transmission devices in the Y year, Y is 1,2, …, and Y is the total year of the whole life cycle;
the power supply planning condition constraints include:
Figure FDA0003220625030000063
wherein,
Figure FDA0003220625030000064
for the total capacity requirement of the power supply in the power system, cGIn order to reduce the construction cost of a unit capacity power supply,
Figure FDA0003220625030000065
the operating and maintenance costs of all newly built power supplies in year y,
Figure FDA0003220625030000066
for the maximum possible maintenance cost of a newly built power supply,
Figure FDA0003220625030000067
the maximum cost budget of the newly built power supply is obtained.
8. The method according to claim 1, wherein the evaluating the plurality of planning and configuration schemes and using the planning and configuration scheme with the optimal evaluation result as the target planning and configuration scheme comprises:
for each planning configuration scheme, determining the transmission margin of the power transmission section under the planning configuration scheme according to the planning configuration scheme;
and taking the planning configuration scheme with the maximum transmission margin of the power transmission section as the target planning configuration scheme.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the method for joint planning and configuration of a flexible ac power transmission apparatus and a power supply according to any of claims 1 to 8.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of a method for joint planning and configuration of a flexible ac power transmission apparatus according to any one of claims 1 to 8 with a power source.
CN202110956829.9A 2021-08-19 2021-08-19 Joint planning configuration method for flexible alternating current transmission device and power supply and terminal equipment Pending CN113839381A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117728406A (en) * 2024-02-08 2024-03-19 国网天津市电力公司城南供电分公司 Intelligent soft switch and energy storage optimization configuration method for snowflake network structure power grid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117728406A (en) * 2024-02-08 2024-03-19 国网天津市电力公司城南供电分公司 Intelligent soft switch and energy storage optimization configuration method for snowflake network structure power grid
CN117728406B (en) * 2024-02-08 2024-06-21 国网天津市电力公司城南供电分公司 Intelligent soft switch and energy storage optimization configuration method for snowflake network structure power grid

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