CN109274114B - MIIF analysis method, device, equipment and medium under control of direct current constant current and constant voltage - Google Patents

MIIF analysis method, device, equipment and medium under control of direct current constant current and constant voltage Download PDF

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CN109274114B
CN109274114B CN201811165354.6A CN201811165354A CN109274114B CN 109274114 B CN109274114 B CN 109274114B CN 201811165354 A CN201811165354 A CN 201811165354A CN 109274114 B CN109274114 B CN 109274114B
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direct current
admittance
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converter station
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CN109274114A (en
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张帆
赵利刚
洪潮
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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Research Institute of Southern Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract

The invention discloses a MIIF analysis method under the control of direct current constant current and constant voltage, which comprises the following steps: firstly, according to the running state of each converter station of a power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station; then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system; acquiring an original alternating current node admittance matrix of the power grid system; correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; and calculating the multi-feed-in direct current interaction factor according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the running state of each converter station of the power grid system in the direct current constant current and constant voltage control mode, the dynamic response characteristic of the direct current transmission system can be considered, and the voltage interaction degree between each direct current converter station is further accurately calculated and evaluated.

Description

MIIF analysis method, device, equipment and medium under control of direct current constant current and constant voltage
Technical Field
The invention relates to the technical field of alternating current and direct current transmission, in particular to a MIIF analysis method, a device, equipment and a medium under the control of direct current constant current and constant voltage.
Background
Energy resources in China are distributed extremely unevenly, and important energy bases are mostly distributed in the remote southwest and northwest areas of China and are far away from more developed load center areas in the southeast. In order to make up for a huge electric energy gap, a large amount of electric energy needs to be transmitted to a load center by adopting a long-distance direct current transmission mode, so that a plurality of direct currents are intensively fed into a certain area, such as China east China power grid, south China power grid and the like. The direct current line with the closer electrical distance and the fed-in alternating current power grid form a multi-feed-in alternating current and direct current system (a multi-feed-in system for short). Compared with a single-loop direct current system, the multi-feed-in system has the advantages that the electrical distance between the loop direct current inversion stations is short, obvious interaction exists, the interaction between the direct current systems and the interaction between the alternating current and direct current systems are interwoven, and the steady state and dynamic characteristics of the whole feed-in power grid are greatly influenced.
In order to reasonably and effectively consider the mutual coupling effect between direct current systems in a multi-direct current feed-in system, in 2006, the technical group of international large power grid organization proposes and defines a multi-fed direct current interaction factor (MIIF) index for evaluating the voltage interaction degree between direct current converter stations, and according to the definition of the multi-fed direct current interaction factor, an inductive load is manually connected to a converter bus j to cause about 1% of voltage drop (marked as delta U)j) Resulting in a voltage drop (noted as Δ U) on the commutation bus ii). Voltage influence factor of converter station j on converter station i
Figure GDA0002685159090000011
In this way,
Figure GDA0002685159090000012
putting a small reactance on the converter bus i results in a variation in the voltage of the converter bus i,
Figure GDA0002685159090000013
the small reactance is put into operation to cause the voltage variation of the commutation bus j. Multi-feed interaction factor MIIFjiThe influence of the voltage drop of the converter bus on other converter buses can be quantitatively described. When the distance between two DC buses is long, MIIFji0; MIIF when the distance between two DC buses is closeji1. Thus, MIIFjiThe magnitude of (c) represents the strength of the voltage action between the commutation busbars.
When the inventor carries out the embodiment of the invention, the inventor finds that the MIIF under the constant current and constant voltage control in the prior art ignores the consideration of the operation state of the actual direct current converter station, so that the MIIF is inaccurate in analysis.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an MIIF analysis method under dc constant current and constant voltage control, which considers the operation state of the actual dc converter station to implement MIIF analysis and calculation, and has high accuracy of the analysis result.
In a first aspect, the present invention provides a MIIF analysis method under dc constant current and constant voltage control, including:
according to the running state of each converter station of the power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station;
obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
acquiring an original alternating current node admittance matrix of the power grid system;
correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix;
and calculating the multi-feed-in direct current interaction factor according to the node impedance matrix.
In a first possible implementation manner of the present invention, the obtaining, according to the operating state of each converter station of the power grid system in the dc constant current and constant voltage control mode, an equivalent admittance corresponding to each converter station includes:
and under a direct current constant current and constant voltage control mode, the dynamic characteristics of each converter station of the power grid system under small voltage disturbance are equivalent to admittance so as to obtain the equivalent admittance corresponding to each converter station.
With reference to the first possible implementation manner of the present invention, in a second possible implementation manner of the present invention, in the dc constant current and constant voltage control mode, the equivalence of dynamic characteristics of each converter station of a power grid system under a small voltage disturbance to obtain an equivalent admittance corresponding to each converter station includes:
under the control mode of DC constant current and constant voltage, the DC I is obtaineddWhen const, the direct current voltage U at the rectification sided1＝const；
Acquiring a direct current transmission system steady-state equation of the power grid system;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1And acquiring the equivalent admittance corresponding to each converter station according to const, the direct current transmission system steady state equation and the admittance equation of the power grid system.
With reference to the second possible implementation manner of the present invention, in a third possible implementation manner of the present invention, a small voltage disturbance is added to each of the converter station buses according to the direct current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance corresponding to each converter station, including:
acquiring a steady state equation of a direct current transmission system of the power grid system:
Figure GDA0002685159090000031
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2Is the commutation reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, gamma is the extinction angle of the inversion side, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure GDA0002685159090000032
is the power factor angle of the rectifier side converter valve,
Figure GDA0002685159090000033
The power factor angle of the inverter side converter valve is adopted;
adding a small voltage disturbance to each converter station bus according to the voltageDirect current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance as
Figure GDA0002685159090000041
Wherein B is an intermediate amount,
Figure GDA0002685159090000042
Figure GDA0002685159090000043
is the alternating current flowing out from the inversion side of the direct current system,
Figure GDA0002685159090000044
in order to commutate the bus voltage,
Figure GDA0002685159090000045
for the small change of the alternating current flowing out from the inversion side of the direct current system,
Figure GDA0002685159090000046
is a small change in the commutation bus voltage.
In a fourth possible embodiment of the invention, the dynamical equivalent admittance matrix is an nth order diagonal matrix.
In a fifth possible implementation manner of the first aspect, the modifying the original ac node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix includes:
subtracting the dynamic characteristic equivalent admittance matrix from the original alternating current node admittance matrix to obtain a corrected admittance matrix;
and acquiring a node impedance matrix according to the corrected admittance matrix.
In a second aspect, the present invention provides an MIIF analysis apparatus under dc constant current and constant voltage control, comprising:
the equivalent admittance acquisition module is used for acquiring the equivalent admittance corresponding to each converter station of the power grid system according to the running state of each converter station of the power grid system in a direct current constant voltage control mode;
the admittance matrix obtaining module is used for obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
the alternating current node admittance matrix acquisition module is used for acquiring an original alternating current node admittance matrix of the power grid system;
the impedance matrix obtaining module is used for correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix and obtaining a node impedance matrix;
and the calculation module is used for calculating the multi-feed-in direct current interaction factor according to the node impedance matrix.
In a first possible implementation manner of the second aspect, the equivalent admittance obtaining module includes:
and under a direct current constant current and constant voltage control mode, the dynamic characteristics of each converter station of the power grid system under small voltage disturbance are equivalent to admittance so as to obtain the equivalent admittance corresponding to each converter station.
In a third aspect, an embodiment of the present invention further provides an analysis apparatus for MIIF under constant current and voltage control, which is characterized by comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the processor implements the method for MIIF under direct current and constant voltage control as described above.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the MIIF analysis method under dc constant current and constant voltage control as described above.
One of the above technical solutions has the following advantages: firstly, according to the running state of each converter station of a power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station; then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system; acquiring an original alternating current node admittance matrix of the power grid system; correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; and calculating the multi-feed-in direct current interaction factor according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the running state of each converter station of the power grid system in the direct current constant current and constant voltage control mode, the dynamic response characteristic of the direct current transmission system can be considered, and the voltage interaction degree between each direct current converter station is further accurately calculated and evaluated.
Drawings
Fig. 1 is a schematic flow chart of an MIIF analysis method under the control of dc constant current and constant voltage according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an MIIF analysis apparatus under dc constant current and constant voltage control according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of an analysis apparatus for MIIF under the control of dc constant current and constant voltage according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a MIIF analysis method under the control of dc constant current and constant voltage according to a first embodiment of the present invention includes the following steps:
s11, obtaining equivalent admittances corresponding to the converter stations according to the running states of the converter stations of the power grid system in a direct current constant voltage control mode;
s12, obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
s13, acquiring an original alternating current node admittance matrix of the power grid system;
s14, correcting the original AC node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix;
and S15, calculating the multi-feed direct current interaction factor according to the node impedance matrix.
It should be noted that, in implementing the embodiment of the present invention, when the dc lines of the multi-feeding system are in different control modes, the mutual influence degree of the voltages between the dc systems is very different. In the embodiment of the invention, the mutual influence degree (MIIF) of the voltage between the direct current systems is obtained based on constant current and constant voltage control.
In the embodiment of the present invention, the dc constant current and voltage control mode is that the dc power transmission system operates in a constant current/constant voltage control mode, where the constant current/constant voltage control mode is that the rectification side of the dc power transmission system operates according to a given dc current IorderCommand to make direct current IdIs kept constant, while the DC voltage on the inverting side of the DC power transmission system controls the rectifying side to be maintained at a given voltage UorderThe following steps.
In step S11, according to the operating state of each converter station of the power grid system in the dc constant current and voltage control mode, the equivalent admittance corresponding to each converter station is obtained, and the dynamic response characteristic of the dc transmission system can be accurately and effectively considered by considering the operating state of the actual dc converter station, and the dynamic (impedance) characteristics of the power supply, the load and other elements can also be effectively considered, so that the voltage interaction degree (MIIF) between the dc converter stations can be calculated at one time, and the calculation speed is fast and the accuracy is high.
Further, the obtaining of the equivalent admittance corresponding to each converter station according to the dynamic characteristic of each converter station of the power grid system in the dc constant current and constant voltage control mode includes:
and under a direct current constant current and constant voltage control mode, the dynamic characteristics of each converter station of the power grid system under small voltage disturbance are equivalent to admittance so as to obtain the equivalent admittance corresponding to each converter station.
In the embodiment of the present invention, the dynamic characteristics in the dc power transmission system are equivalent to admittances, so as to obtain equivalent admittances corresponding to the converter stations.
Further, the equating, in the dc constant current and constant voltage control mode, the dynamic characteristics of each converter station of the power grid system under small voltage disturbance as admittance to obtain the equivalent admittance corresponding to each converter station includes:
under the control mode of DC constant current and constant voltage, the DC I is obtaineddWhen const, the direct current voltage U at the rectification sided1Const; where const denotes a determination value, a determination instruction value input by the user.
Acquiring a direct current transmission system steady-state equation of the power grid system;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1And acquiring the equivalent admittance corresponding to each converter station according to const, the direct current transmission system steady state equation and the admittance equation of the power grid system.
In the embodiment of the invention, the direct current I is obtaineddWhen const, the direct current voltage U at the rectification sided1Const; where const denotes a definite value.
Further, a small voltage disturbance is added to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Acquiring the equivalent admittance corresponding to each converter station according to const, a direct current transmission system steady-state equation and an admittance equation of the power grid system, wherein the const comprises:
acquiring a steady state equation of a direct current transmission system of the power grid system:
Figure GDA0002685159090000081
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2Is the commutation reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, gamma is the extinction angle of the inversion side, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure GDA0002685159090000085
is the power factor angle of the rectifier side converter valve,
Figure GDA0002685159090000086
The power factor angle of the inverter side converter valve is adopted;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance as
Figure GDA0002685159090000082
Wherein B is an intermediate amount,
Figure GDA0002685159090000083
Figure GDA0002685159090000084
the alternating current flows out from the inversion side of the direct current system.
Specifically, under the control of direct current constant current/constant voltage, direct current I is obtaineddWhen const, the direct current voltage U at the rectification sided1Const; wherein const represents a determined value, and a steady-state equation of a direct-current transmission system of the power grid system is obtained:
Figure GDA0002685159090000091
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2Is the commutation reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, gamma is the extinction angle of the inversion side, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure GDA0002685159090000098
is the power factor angle of the rectifier side converter valve,
Figure GDA0002685159090000099
The power factor angle of the inverter side converter valve is adopted; adding a voltage small disturbance and an admittance equation to each converter station bus
Figure GDA0002685159090000092
Wherein
Figure GDA0002685159090000093
In order to commutate the bus voltage,
Figure GDA0002685159090000094
is the alternating current flowing out of the direct current system,
Figure GDA0002685159090000095
the apparent power output from the direct current system to the alternating current system is represented, delta represents a small change, superscript represents a conjugate calculation, and in combination with a steady state equation of the direct current transmission system, the following can be obtained: s2＝f(U2) According to said direct current IdThe rectification side direct current voltage U is constd1Const, the steady state equation, andobtaining the equivalent admittance by the admittance equation to obtain delta S for further linearization2＝f'(U2)ΔU2Where f' (U)2) Is f (U)2) The equivalent admittance can be obtained as:
Figure GDA0002685159090000096
wherein B is an intermediate amount,
Figure GDA0002685159090000097
it should be noted that the operation state of each converter station of the power grid system in the dc constant current and constant voltage control mode needs to be obtained first, and then the corresponding equivalent admittance is obtained through calculation.
Further, the dynamic characteristic equivalent admittance matrix is an nth order diagonal matrix.
Further, the modifying the original ac node admittance matrix according to the dynamic characteristic equivalent admittance matrix and obtaining a node impedance matrix includes:
subtracting the dynamic characteristic equivalent admittance matrix from the original alternating current node admittance matrix to obtain a corrected admittance matrix;
and acquiring a node impedance matrix according to the corrected admittance matrix.
Specifically, after obtaining the operation control mode of each return direct current constant voltage, obtaining the operation state of each converter station, and equating the dynamic characteristic of each converter station of the power grid system under small voltage disturbance as admittance, that is, according to the direct current IdThe rectification side direct current voltage U is constd1Acquiring the equivalent admittance, such as Y, corresponding to each converter station according to const, the direct current transmission system steady state equation and the admittance equation of the power grid systemΔ1、YΔ2.....YΔnForming an equivalent additional admittance matrix considering the response characteristic of the small disturbance of the direct current inversion station:
Figure GDA0002685159090000101
YΔthe grid node array is an n-order diagonal array, n is the number of alternating current nodes of the whole power grid system, and i is 1 and 2 … … n; when the node i is a converter bus node of the inverter station, the equivalent admittance can be obtained by the method, otherwise, Y isΔi0. Correcting the original AC node admittance matrix according to the dynamic characteristic equivalent admittance matrix, obtaining a node impedance matrix, and subtracting the dynamic characteristic equivalent admittance matrix from the original AC node admittance matrix to obtain a corrected admittance matrix Ym＝Y-YΔWherein Y is the original AC node admittance matrix, YmObtaining a node impedance matrix Z for the modified admittance matrix according to the modified admittance matrixm＝Ym -1Wherein Z ismIs a node impedance matrix. According to
Figure GDA0002685159090000102
The multi-DC interaction factor of any commutation bus node j and node i can be calculated, wherein ZmjiIs ZmThe j-th row and i-th column of elements, further, dynamic (impedance) characteristics of elements in the power transmission system are considered.
The embodiment has the following beneficial effects:
firstly, according to the running state of each converter station of a power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station; then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system; acquiring an original alternating current node admittance matrix of the power grid system; correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; and calculating the multi-feed-in direct current interaction factor according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the running state of each converter station of the power grid system in the direct current constant current and constant voltage control mode, the dynamic response characteristic of the direct current transmission system can be considered, and the voltage interaction degree between each direct current converter station is further accurately calculated and evaluated.
Example two
Referring to fig. 2, fig. 2 is a schematic structural diagram of an MIIF analysis apparatus under dc constant current and constant voltage control according to a second embodiment of the present invention.
An MIIF analysis device under DC constant current and constant voltage control, comprising:
the equivalent admittance acquiring module 21 is configured to acquire an equivalent admittance corresponding to each converter station of the power grid system according to an operating state of each converter station in a dc constant current and constant voltage control mode;
an admittance matrix obtaining module 22, configured to obtain an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
an ac node admittance matrix obtaining module 23, configured to obtain an original ac node admittance matrix of the power grid system;
an impedance matrix obtaining module 24, configured to modify the original ac node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtain a node impedance matrix;
and the calculating module 25 is configured to calculate a multi-feed dc interaction factor according to the node impedance matrix.
Preferably, the equivalent admittance acquiring module 21 includes:
and the admittance obtaining unit is used for equivalence of dynamic characteristics of each converter station of the power grid system under small voltage disturbance as admittance in a direct current constant current and constant voltage control mode so as to obtain equivalent admittance corresponding to each converter station.
Preferably, the admittance acquiring unit includes:
a DC information acquisition unit for acquiring DC current I in DC constant current and constant voltage control modedWhen const, the direct current voltage U at the rectification sided1＝const；
The steady state equation obtaining unit is used for obtaining a direct current transmission system steady state equation of the power grid system;
an equivalent admittance obtaining unit, configured to add a small voltage disturbance to each bus of the converter station according to the dc current IdThe rectification side direct current voltage U is constd1And acquiring the equivalent admittance corresponding to each converter station according to const, the direct current transmission system steady state equation and the admittance equation of the power grid system.
Preferably, the equivalent admittance acquiring unit includes:
acquiring a steady state equation of a direct current transmission system of the power grid system:
Figure GDA0002685159090000121
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2Is the commutation reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, gamma is the extinction angle of the inversion side, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure GDA0002685159090000125
is the power factor angle of the rectifier side converter valve,
Figure GDA0002685159090000126
The power factor angle of the inverter side converter valve is adopted;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance as
Figure GDA0002685159090000122
Wherein B is an intermediate amount,
Figure GDA0002685159090000123
Figure GDA0002685159090000124
the alternating current flows out from the inversion side of the direct current system.
Further, the dynamic characteristic equivalent admittance matrix is an nth order diagonal matrix.
Further, the impedance matrix obtaining module 24 includes:
subtracting the dynamic characteristic equivalent admittance matrix from the original alternating current node admittance matrix to obtain a corrected admittance matrix;
and acquiring a node impedance matrix according to the corrected admittance matrix.
The embodiment has the following beneficial effects:
firstly, according to the running state of each converter station of a power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station; then obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system; acquiring an original alternating current node admittance matrix of the power grid system; correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix; and calculating the multi-feed-in direct current interaction factor according to the node impedance matrix. When the equivalent admittance corresponding to each converter station is obtained according to the running state of each converter station of the power grid system in the direct current constant current and constant voltage control mode, the dynamic response characteristic of the direct current transmission system can be considered, and the voltage interaction degree between each direct current converter station is further accurately calculated and evaluated.
EXAMPLE III
Referring to fig. 3, fig. 3 is a schematic diagram of an MIIF analyzing apparatus under dc constant current and constant voltage control according to a third embodiment of the present invention, configured to perform an MIIF analyzing method under dc constant current and constant voltage control according to the third embodiment of the present invention, as shown in fig. 3, the MIIF analyzing apparatus under dc constant current and constant voltage control includes: at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, at least one communication bus 12, the communication bus 12 being used to enable connectivity communications between these components. The user interface 13 may optionally include a USB interface, and other standard interfaces, wired interfaces. The network interface 14 may optionally include a Wi-Fi interface as well as other wireless interfaces. The memory 15 may comprise a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 15 may optionally comprise at least one memory device located remotely from the aforementioned processor 11.
In some embodiments, memory 15 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof:
an operating system 151, which contains various system programs for implementing various basic services and for processing hardware-based tasks;
and (5) a procedure 152.
Specifically, the processor 11 is configured to call the program 152 stored in the memory 15 to execute the MIIF analysis method under dc constant current and constant voltage control described in the above embodiments.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor is a control center of the MIIF analysis method under constant current and voltage control, and various interfaces and lines are used to connect the various parts of the MIIF analysis method under constant current and voltage control.
The memory may be used to store the computer program and/or module, and the processor may implement various functions of the electronic device for analysis of MIIF under constant current and voltage control by running or executing the computer program and/or module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, a text conversion function, etc.), and the like; the storage data area may store data (such as audio data, text message data, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The MIIF analysis integrated module under the control of the DC constant current and constant voltage can be stored in a computer readable storage medium if the MIIF analysis integrated module is realized in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. 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 the 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 contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and in a part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are preferred and that acts and simulations are necessarily required in accordance with the invention.

Claims (6)

1. A MIIF analysis method under the control of direct current constant current and constant voltage is characterized by comprising the following steps:
according to the running state of each converter station of the power grid system in a direct current constant current and constant voltage control mode, obtaining the equivalent admittance corresponding to each converter station;
obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
acquiring an original alternating current node admittance matrix of the power grid system;
correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix, and obtaining a node impedance matrix;
calculating a multi-feed-in direct current interaction factor according to the node impedance matrix;
the obtaining of the equivalent admittance corresponding to each converter station according to the operating state of each converter station of the power grid system in the direct current constant current and constant voltage control mode includes:
in a direct current constant current and constant voltage control mode, the dynamic characteristics of each converter station of a power grid system under small voltage disturbance are equivalent to admittance so as to obtain the equivalent admittance corresponding to each converter station;
the method for obtaining the equivalent admittance of each converter station of the power grid system under the condition of small voltage disturbance in the direct current constant voltage control mode comprises the following steps:
under the control mode of DC constant current and constant voltage, the DC I is obtaineddWhen const, the direct current voltage U at the rectification sided1＝const；
Acquiring a direct current transmission system steady-state equation of the power grid system;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Acquiring equivalent admittances corresponding to the converter stations according to const, a direct current transmission system steady state equation and an admittance equation of the power grid system;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Acquiring the equivalent admittance corresponding to each converter station according to const, a direct current transmission system steady-state equation and an admittance equation of the power grid system, wherein the const comprises:
acquiring a steady state equation of a direct current transmission system of the power grid system:
Figure FDA0002685159080000021
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2Is the commutation reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, gamma is the extinction angle of the inversion side, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure FDA0002685159080000028
is the power factor angle of the rectifier side converter valve,
Figure FDA0002685159080000029
The power factor angle of the inverter side converter valve is adopted;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance as
Figure FDA0002685159080000022
Wherein B is an intermediate amount,
Figure FDA0002685159080000023
Figure FDA0002685159080000024
is the alternating current flowing out from the inversion side of the direct current system,
Figure FDA0002685159080000025
in order to commutate the bus voltage,
Figure FDA0002685159080000026
for the small change of the alternating current flowing out from the inversion side of the direct current system,
Figure FDA0002685159080000027
is a small change in the commutation bus voltage.
2. The MIIF analysis method under DC constant current and voltage control according to claim 1, wherein the dynamic equivalent admittance matrix is an n-th order diagonal matrix.
3. The MIIF analysis method under the control of the direct current constant voltage according to claim 1, wherein the correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix and obtaining the node impedance matrix comprises:
subtracting the dynamic characteristic equivalent admittance matrix from the original alternating current node admittance matrix to obtain a corrected admittance matrix;
and acquiring a node impedance matrix according to the corrected admittance matrix.
4. An MIIF analysis device under DC constant current and constant voltage control, comprising:
the equivalent admittance acquisition module is used for acquiring the equivalent admittance corresponding to each converter station of the power grid system according to the running state of each converter station of the power grid system in a direct current constant voltage control mode;
the admittance matrix obtaining module is used for obtaining an n-order dynamic characteristic equivalent admittance matrix according to the equivalent admittance; wherein n is the number of alternating current nodes of the power grid system;
the alternating current node admittance matrix acquisition module is used for acquiring an original alternating current node admittance matrix of the power grid system;
the impedance matrix obtaining module is used for correcting the original alternating current node admittance matrix according to the dynamic characteristic equivalent admittance matrix and obtaining a node impedance matrix;
the calculation module is used for calculating a multi-feed-in direct current interaction factor according to the node impedance matrix;
the equivalent admittance acquiring module includes:
the admittance obtaining unit is used for equating the dynamic characteristics of each converter station of the power grid system under small voltage disturbance as admittance in a direct current constant current and constant voltage control mode so as to obtain equivalent admittance corresponding to each converter station;
the admittance acquiring unit includes:
a DC information acquisition unit for acquiring DC current I in DC constant current and constant voltage control modedWhen const, the direct current voltage U at the rectification sided1＝const；
The steady state equation obtaining unit is used for obtaining a direct current transmission system steady state equation of the power grid system;
an equivalent admittance obtaining unit, configured to add a small voltage disturbance to each bus of the converter station according to the dc current IdThe rectification side direct current voltage U is constd1Acquiring equivalent admittances corresponding to the converter stations according to const, a direct current transmission system steady state equation and an admittance equation of the power grid system;
the equivalent admittance acquiring unit includes:
acquiring a steady state equation of a direct current transmission system of the power grid system:
Figure FDA0002685159080000041
wherein, Ud1For rectifying the DC voltage, U, of the converter station on the side of the pole to groundd2For a direct voltage of pole-to-ground of the converter station on the reverse flow side, N1For the number of 6 pulsating converter valves in each pole of the rectifying side, N2The number of 6 pulsating converter valves in each pole of the reverse flow side is U1For the effective value of the side line voltage of the rectifier side converter transformer valve, U2Is the effective value of the side line voltage of the reverse flow side converter valve, Xr1For commutation reactance of each phase at the commutation side, Xr2The phase-change reactance of each phase on the reverse flow side, alpha is the extinction angle of the rectification side, and gamma is the inverseVariable side extinction angle, IdIs the mean value of DC current, RdIs a single-pole direct-current line resistor,
Figure FDA0002685159080000042
is the power factor angle of the rectifier side converter valve,
Figure FDA0002685159080000043
The power factor angle of the inverter side converter valve is adopted;
adding a small voltage disturbance to each converter station bus according to the direct current IdThe rectification side direct current voltage U is constd1Obtaining the equivalent admittance as
Figure FDA0002685159080000044
Wherein B is an intermediate amount,
Figure FDA0002685159080000045
Figure FDA0002685159080000046
is the alternating current flowing out from the inversion side of the direct current system,
Figure FDA0002685159080000047
in order to commutate the bus voltage,
Figure FDA0002685159080000048
for the small change of the alternating current flowing out from the inversion side of the direct current system,
Figure FDA0002685159080000049
is a small change in the commutation bus voltage.
5. An analysis apparatus for MIIF under dc constant voltage control, comprising a processor, a memory, and an analyzer program stored in the memory and configured to be executed by the processor, the processor implementing the method of MIIF analysis under dc constant voltage control as claimed in any one of claims 1 to 3 when executing the analyzer program.
6. An analyzer-readable storage medium, comprising a stored analyzer program, wherein the analyzer-readable storage medium, when running, controls an apparatus in which the analyzer-readable storage medium is located to perform the MIIF analysis method under dc constant current and voltage control according to any one of claims 1 to 3.
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