CN115579967A - Large power grid AC/DC multi-section power adjustment method and system - Google Patents
Large power grid AC/DC multi-section power adjustment method and system Download PDFInfo
- Publication number
- CN115579967A CN115579967A CN202211451501.2A CN202211451501A CN115579967A CN 115579967 A CN115579967 A CN 115579967A CN 202211451501 A CN202211451501 A CN 202211451501A CN 115579967 A CN115579967 A CN 115579967A
- Authority
- CN
- China
- Prior art keywords
- section
- power
- generator set
- output
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 97
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000033228 biological regulation Effects 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 16
- 238000012360 testing method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000035945 sensitivity Effects 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012887 quadratic function Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a method and a system for adjusting power of an alternating current and a direct current multi-section of a large power grid, wherein the method comprises the following steps: calculating a power deviation amount based on the section type of the target section, the current power and the target power; when the absolute value of the power deviation is larger than a preset power deviation threshold, determining an adjustable generator set associated with the target section; and determining the output adjustment amount of the adjustable generator set based on the power deviation amount, and adjusting based on the output adjustment amount so as to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power. When the alternating current section is adjusted, the unit groups are firstly used for carrying out coarse adjustment and then fine adjustment, the problem of mutual influence among a plurality of sections can be effectively avoided, the voltage out-of-limit and balancing machine out-of-limit conditions which possibly occur in the adjustment process are comprehensively considered for the direct current section, the adjustment result is enabled to better meet the requirements of practical engineering application, the adjustment speed and efficiency can be greatly improved, the labor is saved, and the workload is reduced.
Description
Technical Field
The invention relates to the technical field of current system simulation, in particular to a method and a system for adjusting alternating current and direct current multi-section power of a large power grid.
Background
The adjustment of the section power of the power grid is an important link in the safety and stability analysis and the arrangement work of the operation mode of the power system. With the rapid development of the alternating-current and direct-current hybrid power grid, the energy transmission change between areas is more severe, and the power flowing through the alternating-current and direct-current sections needs to be continuously adjusted according to the change of the operation mode. The traditional adjusting method mainly depends on a dispatcher to repeatedly adjust the output of a section sending unit and a receiving unit by adopting a trial and error method according to working experience until the power of the section reaches a target value. The adjustment effect varies from person to person, and the accuracy cannot be guaranteed; the adjustment workload is large, and a large amount of manpower and energy are consumed; mutual influence among a plurality of coupling sections is difficult to consider, various constraints such as voltage and a balancing machine cannot be met simultaneously in the adjustment process, and the requirements of diversity and comprehensiveness of operation modes are difficult to meet, so that the accuracy of safety and stability analysis of a power grid is influenced. Therefore, the realization of intelligent adjustment of the section power has important significance for improving the automation level of calculation of the operation mode of the power grid.
At present, the existing section power adjustment method mainly aims at a single section, and mainly adopts methods including a power flow section constraint method, a sensitivity method and an optimization control method. The power flow section constraint method is to expand the conventional power flow calculation method, increase the constraint condition of section power and repeatedly calculate the power flow through multiple iterative adjustments until the section power is close to a target value. The method is simple in principle and easy to implement, but the calculation amount is large, and the calculation speed is difficult to meet the requirement. The sensitivity method is characterized in that a set with large influence on section power is selected to be adjusted by calculating sensitivity indexes, and the adjustment amount is determined by adopting a reverse equivalent pairing principle, so that the sensitivity method can meet engineering requirements in practice. However, the sensitivity index is closely related to the operation mode, the sensitivity is recalculated for different data, and the sensitivity index can only reflect the influence of the unit on a single section, so that the influence on other branches or the limitation on the adjustment direction or priority of the adjustment measures is difficult to be considered, the degree of freedom of the combination of the adjustment measures is reduced, and the optimal solution or even no solution is possibly missed. The optimization control method usually takes the minimum sum of absolute values of the adjustment quantity or the minimum power generation cost represented by a quadratic function as a control target, and adopts optimization algorithms such as nonlinear programming and a dual-source interior point method to solve to obtain the output of each unit.
Therefore, a section power adjusting method which is suitable for a large-scale alternating current-direct current hybrid power grid, comprehensively considers the mutual influence among a plurality of sections and fully utilizes the existing manual experience is urgently needed.
Disclosure of Invention
The invention provides a method and a system for adjusting alternating current and direct current multi-section power of a large power grid, and aims to solve the problem of how to adjust the power of a power grid section.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for adjusting ac/dc multi-section power of a large power grid, the method including:
calculating a power deviation amount based on the section type of the target section, the current power and the target power;
when the absolute value of the power deviation amount is larger than a preset power deviation amount threshold value, determining an adjustable generator set associated with the target section;
and determining an output adjustment amount of an adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power.
Preferably, the calculating the power deviation amount based on the section type of the target section, the current power and the target power includes:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following modes:
wherein ,
is the amount of power deviation;
and
target power of the direct current section and the alternating current section are respectively;
and
the current power of the direct current section and the current power of the alternating current section are respectively;
and
the power of the pole 1 and the power of the pole 2 of the direct current section are respectively.
Preferably, when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold, determining an adjustable generator set associated with the target cross section includes:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus respectively according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraint comprises:
wherein ,
the node type of the generator set;
the active output of the generator set is obtained;
the active output upper limit of the generator set is set;
the lower limit of active output of the generator set.
Preferably, the determining the output adjustment of the adjustable generator set associated with the target fracture surface based on the power deviation amount comprises:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets participating in adjustment is respectively the section sending end and the section receiving end;
generating set with section as sending end
The increased active power of the electric motor is increased,
active power reduced for the section receiving end generator set j;
generating set for transmitting end
The start-stop sign of (1) is set,
a start-stop sign of a receiving end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving end generator set j is obtained;
for the current active power of the sending-end genset i,
the current active power of the receiving end generator set j is obtained;
when the temperature is higher than the set temperature
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein , 
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and is the maximum value of the active power of the receiving end generator set j.
Preferably, wherein the method further comprises: before said calculating the power deviation amount based on the section type of the target section, the current power and the target power,
and traversing all the alternating current sections needing to be adjusted, selecting an adjustable generator set only connected with any one of the alternating current sections for any one of the alternating current sections, and adjusting any one of the alternating current sections based on the adjustable generator set only connected with any one of the alternating current sections.
Preferably, wherein the method further comprises:
when the section type of the target section is a direct current section, judging whether the regulated direct current bus voltage is out of limit or not based on the preset upper and lower limit values of the direct current bus voltage, and obtaining a first judgment result;
when the first judgment result indicates that the voltage of the direct-current bus is out of limit, adjusting reactive compensation equipment associated with the direct-current bus;
judging whether the balancing machine is out of limit or not based on the preset active output limit value of the balancing machine, and obtaining a second judgment result;
when the second determination result indicates that the output of the balancing machine is out of limit, the output of the generator associated with the balancing machine is adjusted.
Preferably, when the first determination result indicates that the voltage of the dc bus is out of limit, adjusting reactive compensation equipment associated with the dc bus includes:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the preset voltage of the direct current bus, the parallel capacitor connected with the direct current bus of any stage and with the branch within the first preset stage is withdrawn, and the parallel reactor connected with the direct current bus of any stage and with the branch within the first preset stage is put in;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the lower limit of the preset voltage of the direct current bus, the shunt reactor connected with the direct current bus of any stage and provided with the branch within the first preset stage is withdrawn, and the shunt capacitor connected with the direct current bus of any stage and provided with the branch within the first preset stage is added.
Preferably, wherein said adjusting the generator output associated with said balancing machine when said second determination indicates a balance machine output overrun comprises:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the balancing machine, inputting a generator set which is connected with a branch within a second preset number of stages of the balancing machine and is in a shutdown state, or increasing the output of the generator set which is connected with the branch within the second preset number of stages of the balancing machine and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set which is connected with the branch within a second preset number and is in the running state.
According to another aspect of the invention, a large power grid alternating current and direct current multi-section power regulation system is provided, and the system comprises:
the power deviation amount calculating unit is used for calculating the power deviation amount based on the section type of the target section, the current power and the target power;
the adjustable generator set determining unit is used for determining an adjustable generator set associated with the target section when the absolute value of the power deviation amount is larger than a preset power deviation amount threshold;
and the adjusting unit is used for determining the output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount so as to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power.
Preferably, the calculating unit of power deviation amount, based on the type of the target cross section, the current power and the target power, calculates power deviation amount, including:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following modes:
wherein ,
is the amount of power deviation;
and
target power of a direct current section and a alternating current section respectively;
and
the current power of the direct current section and the current power of the alternating current section are respectively;
and
the power of the pole 1 and the power of the pole 2 of the direct current section are respectively.
Preferably, the adjustable generator set determining unit, when the absolute value of the power deviation is greater than a preset power deviation threshold, determines an adjustable generator set associated with the target cross section, and includes:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus respectively according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraints include:
wherein ,
the node type of the generator set;
the active output of the generator set is obtained;
the active output upper limit of the generator set is set;
the lower limit of active output of the generator set.
Preferably, the adjusting unit, based on the power deviation amount, determines an output adjustment amount of an adjustable generator set associated with the target fracture surface, and includes:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets participating in adjustment is respectively the section sending end and the section receiving end;
generating set with section as sending end
The increased active power of the electric machine is increased,
active power reduced for the section receiving end generator set j;
for sending end generator set
The start-stop flag of (1) is set,
a start-stop sign of a receiving end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving end generator set j is obtained;
for the current active power of the sending-end genset i,
the current active power of the receiving end generator set j;
when in use
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein , 
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and the maximum value of the active power of the receiving end generator set j.
Preferably, wherein the system further comprises:
and the alternating current section initial adjusting unit is used for traversing all alternating current sections needing to be adjusted before calculating the power deviation amount based on the section type, the current power and the target power of the target section, selecting an adjustable generator set only connected with any one alternating current section for any one alternating current section, and adjusting any one alternating current section based on the adjustable generator set only connected with any one alternating current section.
Preferably, wherein the system further comprises:
a first judgment result obtaining unit, configured to, when the type of the target cross section is a dc cross section, judge whether the regulated dc bus voltage is out of limit based on a preset dc bus voltage upper and lower limit value, and obtain a first judgment result;
the direct-current bus voltage out-of-limit adjusting unit is used for adjusting reactive compensation equipment associated with the direct-current bus when the first judgment result indicates that the direct-current bus voltage is out of limit;
the second judgment result acquisition unit is used for judging whether the balancing machine exceeds the limit or not based on the preset active output limit value of the balancing machine and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the output of the generator associated with the balancing machine when the second judgment result indicates that the output of the balancing machine is out of limit.
Preferably, when the first determination result indicates that the dc bus voltage is out of limit, the dc bus voltage out-of-limit adjusting unit adjusts reactive compensation equipment associated with the dc bus, including:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the voltage of the preset direct current bus, the parallel capacitor connected with the branch circuit of the direct current bus of any stage within the first preset stage is withdrawn, and the parallel reactor connected with the branch circuit of the direct current bus of any stage within the first preset stage is put into the parallel capacitor;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the lower limit of the preset voltage of the direct current bus, the shunt reactor connected with the direct current bus of any stage and provided with the branch within the first preset stage is withdrawn, and the shunt capacitor connected with the direct current bus of any stage and provided with the branch within the first preset stage is added.
Preferably, the balancing machine output out-of-limit adjusting unit, when the second determination result indicates that the balancing machine output is out-of-limit, adjusts the generator output associated with the balancing machine, including:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the preset balancing machine, inputting a generator set which is connected with a branch of the balancing machine within a second preset number of stages and is in a shutdown state, or increasing the output of the generator set which is connected with the branch of the balancing machine within the second preset number of stages and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set which is connected with the branch within a second preset number and is in the running state.
Based on another aspect of the invention, the invention provides a computer readable storage medium, on which a computer program is stored, which program, when executed by a processor, performs the steps of any one of the methods for large grid ac/dc multi-section power regulation.
Based on another aspect of the present invention, the present invention provides an electronic device comprising:
the computer-readable storage medium described above; and
one or more processors to execute the program in the computer-readable storage medium.
The invention provides a method and a system for adjusting power of an alternating current and a direct current multi-section of a large power grid, wherein the method comprises the following steps: calculating a power deviation amount based on the section type of the target section, the current power and the target power; when the absolute value of the power deviation amount is larger than a preset power deviation amount threshold value, determining an adjustable generator set associated with the target section; and determining an output adjustment amount of an adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power. The invention adjusts the power of the alternating current section and the direct current section based on the power deviation amount, firstly carries out rough adjustment through the machine set grouping when the alternating current section is adjusted, and then carries out fine adjustment, thereby effectively avoiding the problem of mutual influence among a plurality of sections.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a method 100 for ac/dc multi-section power regulation of a large power grid according to an embodiment of the present invention;
FIG. 2 is a flow chart of DC multi-section power regulation according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a large power grid ac/dc multi-section power regulation system 300 according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method 100 for ac/dc multi-section power regulation of a large power grid according to an embodiment of the present invention. As shown in fig. 1, the ac/dc multi-section power adjustment method for a large power grid according to the embodiment of the present invention adjusts the power of an ac section and a dc section based on a power deviation amount, and performs coarse adjustment and fine adjustment by using a unit group during ac section adjustment, so as to effectively avoid the problem of mutual influence between a plurality of sections. The method 100 for adjusting the power of the alternating current and direct current multi-section of the large power grid starts from step 101, and calculates a power deviation amount based on the section type of a target section, the current power and the target power in step 101.
Preferably, the calculating the power deviation amount based on the section type of the target section, the current power and the target power includes:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following modes:
wherein ,
is the amount of power deviation;
and
target power of the direct current section and the alternating current section are respectively;
and
the current power of the direct current section and the current power of the alternating current section are respectively;
and
the power of the pole 1 and the power of the pole 2 of the direct current section are respectively.
In the present invention, for any target cross section, when the cross section power is adjusted, the power deviation amount is first calculated from the current power and the target power of the cross section.
Wherein, for the DC cross section, calculating the power deviation amount according to the current power and the target power of the DC cross section
The calculation formula is as follows:
wherein ,
and
the power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively, and if the operation mode is monopolar operation, the corresponding power of the electrode =0;
the current power of the direct current section;
the target power of the direct current section;
the power deviation of the DC section is obtained.
For the alternating current section, calculating the power deviation amount according to the current power and the target power of the alternating current section, wherein the calculation formula is as follows:
wherein ,
the current power of the alternating current section;
target power for alternating current section;
the power deviation of the AC section is shown.
In step 102, when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold value, an adjustable generator set associated with the target cross section is determined.
Preferably, when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold, determining an adjustable generator set associated with the target cross section includes:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraint comprises:
wherein ,
The node type of the generator set;
the active power output of the generator set is obtained;
the active output upper limit of the generator set is set;
the lower limit of active output of the generator set.
In the invention, after the power deviation amount is determined, whether the power deviation amount is an alternating current section or a direct current section, a transmitting end is determined based on the power direction of the section, an adjustable generator set associated with the section is searched from a section transmitting end bus and a receiving end bus respectively according to the electrical distance, and the adjustable generator set meets the following constraint conditions:
wherein ,
the node type of the generator set;
the active power output of the generator set is obtained;
the active power output upper limit of the generator set is set;
the active output lower limit of the generator set is set; wherein, the balance machine, the wind power and the photoelectric machine set without adjusting ability do not participate in the adjustment.
In step 103, determining an output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount so that an absolute value of the power deviation amount is smaller than a preset power deviation amount threshold value, thereby completing adjustment of the section power.
Preferably, the determining, based on the power deviation amount, a power adjustment amount of an adjustable generator set associated with the target fracture surface includes:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets which participate in adjustment of the section sending end and the section receiving end is respectively;
generating set for transmitting end to cross section
The increased active power of the electric machine is increased,
the active power reduced for the section receiving end generator set j;
for sending end generator set
The start-stop sign of (1) is set,
a start-stop sign of a receiving end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving end generator set j is obtained;
is composed ofThe current active power of the sending-end generator set i,
the current active power of the receiving end generator set j is obtained;
when in use
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein , 
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and the maximum value of the active power of the receiving end generator set j.
Preferably, wherein the method further comprises:
when the section type of the target section is a direct current section, judging whether the regulated direct current bus voltage is out of limit or not based on the preset upper and lower limit values of the direct current bus voltage, and obtaining a first judgment result;
when the first judgment result indicates that the voltage of the direct-current bus is out of limit, adjusting reactive compensation equipment associated with the direct-current bus;
judging whether the balancing machine is out of limit or not based on the preset active output limit value of the balancing machine, and obtaining a second judgment result;
when the second determination result indicates that the output of the balancing machine is out of limit, the output of the generator associated with the balancing machine is adjusted.
Preferably, when the first determination result indicates that the voltage of the dc bus is beyond a limit, adjusting the reactive compensation equipment associated with the dc bus includes:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the preset voltage of the direct current bus, the parallel capacitor connected with the direct current bus of any stage and with the branch within the first preset stage is withdrawn, and the parallel reactor connected with the direct current bus of any stage and with the branch within the first preset stage is put in;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the preset lower limit of the voltage of the direct current bus, the shunt reactor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is withdrawn, and the shunt capacitor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is added.
Preferably, wherein said adjusting the generator output associated with said balancing machine when said second determination indicates a balance machine output overrun comprises:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the preset balancing machine, inputting a generator set which is connected with a branch of the balancing machine within a second preset number of stages and is in a shutdown state, or increasing the output of the generator set which is connected with the branch of the balancing machine within the second preset number of stages and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set in the running state, which is connected with the branch within a second preset number, of the balancing machine.
In the invention, the output of the unit is adjusted according to a reverse equivalent pairing principle whether the unit is a direct current section or an alternating current section until the power deviation amount meets a threshold value. The adjustment principle is as follows:
(1) when the temperature is higher than the set temperature
When this is the case, the cross-sectional power needs to be increased. At this time, the sending end increases the output, the receiving end decreases the output, and the power adjustment amounts of the sending end and the receiving end are consistent.
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets which participate in adjustment of the section sending end and the section receiving end is respectively;
generating set with section as sending end
The increased active power of the electric motor is increased,
the active power reduced for the section receiving end generator set j;
generating set for transmitting end
The start-stop sign of (1) is set,
a start-stop sign of a receiving-end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving-end generator set j is obtained;
for the current active power of the sending-end generator set i,
is the current active power of the receiving generator set j.
(2) When in use
When this is the case, the reduction of the cross-sectional power is required. At this time, the sending end reduces the output, the receiving end increases the output, and the power adjustment amount of the sending end and the receiving end is consistent.
wherein , 
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and is the maximum value of the active power of the receiving end generator set j.
Referring to fig. 2, in the present invention, after the adjustment, it is necessary to check whether the dc bus voltages on both sides of the dc cross section are out of limit, and if any dc bus voltage is out of limit, the reactive power compensation equipment near the dc bus is adjusted. The specific process comprises the following steps:
1. and judging whether the direct current bus voltage on two sides of the regulated direct current section exceeds the limit, wherein the judgment standard is as follows:
wherein ,
、 
the upper and lower limit values of the direct current bus voltage are respectively;
、
the voltages of the pole 1 and the pole 2 of the direct current bus are respectively.
2. If the voltage of any direct current bus is higher than the upper limit, the parallel capacitor connected with the direct current bus by the 5-level inner branch is withdrawn, and the parallel reactor connected with the direct current bus by the 5-level inner branch is put in.
3. If the voltage of any direct current bus is lower, the shunt reactor connected with the direct current bus with the branch circuit within 5 levels is withdrawn, and the shunt capacitor connected with the direct current bus with the branch circuit within 5 levels is put into use.
In the invention, whether the adjusted full-network balancing machine exceeds the limit or not needs to be checked, and if the adjusted full-network balancing machine exceeds the limit, the output of the generator near the balancing machine is adjusted. The specific process comprises the following steps:
1. judging whether the active output of the balance machine after adjustment exceeds the limit, wherein the judgment standard is as follows:
wherein , 
to balance the machine forces.
2. And if the output of the balancing machine is higher, putting the shutdown generator connected with the branch with the 5 th level of the balancing machine or increasing the output of the operated generator connected with the branch with the 5 th level of the balancing machine.
3. And if the output of the balancing machine is lower, reducing the output of the operated generator connected with the inner branch of 5 stages of the balancing machine.
In the invention, the direct current multi-section power adjustment process comprises the following steps: firstly, adjusting the output of a generator according to the power deviation value of the current power and the target power of a direct current section; then, checking whether the voltage of the direct current bus is out of limit, and if so, adjusting reactive power compensation equipment nearby the direct current bus; and finally, checking whether the adjusted balancing machine exceeds the limit or not, and if so, adjusting the output of the generator near the balancing machine. And sequentially adjusting according to the sequence of the direct current sections until the direct current sections all reach the target.
Preferably, wherein the method further comprises: before said calculating the power deviation amount based on the section type of the target section, the current power and the target power,
and traversing all the alternating current sections needing to be adjusted, selecting an adjustable generator set only connected with any one of the alternating current sections for any one of the alternating current sections, and adjusting any one of the alternating current sections based on the adjustable generator set only connected with any one of the alternating current sections.
In the invention, when AC multi-section power adjustment is carried out, the power of each section is roughly adjusted in sequence according to the sequence of the sections, and when an adjustable generator set is searched, the generator sets are grouped for reducing the mutual influence among the sections; and then, after all the sections are adjusted, finely adjusting the sections of which the section power cannot reach the target power.
The coarse adjustment refers to traversing all alternating current sections needing to be adjusted, selecting an adjustable generator set only connected with any one alternating current section for any one alternating current section, and adjusting any one alternating current section based on the adjustable generator set only connected with any one alternating current section. The unit grouping principle means that when a generator with an adjustable cross section is searched, the searching range is the unit connected with the cross section and cannot penetrate through other cross sections, so that mutual influence between coupling cross sections is avoided. The combined coarse adjustment and fine adjustment is that after one round of adjustment is performed on all the sections, the adjustment is performed on the sections with smaller deviation between the section power and the target power until the section power reaches the target power value. The fine adjustment process of the ac section is consistent with the adjustment process of the dc section, and will not be described herein.
In the invention, the construction of the section adjustment knowledge graph can be carried out, which means that knowledge in the alternating current-direct current multi-section adjustment process is extracted into nodes and relations in the knowledge graph according to 4 types of power grid states, data characteristics, adjustment rules and adjustment means, the nodes and relations are represented by adopting triples, and the section adjustment knowledge graph is constructed according to a state transfer process.
Wherein, the nodes of the profile adjustment knowledge graph comprise: state nodes, feature nodes, operation nodes, attribute nodes, and the like. For example, the direct current section power adjustment state, the section power deviation amount larger than a threshold value, the adjustable generator set near the section and the active power output of the generator are searched. The relation of the section adjusting knowledge graph comprises the following steps: featured, operated, attributed, etc. The triple knowledge representation mode is that < node, relation and node > is adopted to describe knowledge. For example: the method is characterized in that the direct current section power adjustment state is characterized in that the direct current section power deviation amount is larger than a threshold value >, < the direct current section power adjustment state is operated, an adjustable generator set > near the section is searched, and < the adjustable generator set > has attributes and the active power output of a generator.
The intelligent AC/DC multi-section power adjustment method based on knowledge driving is characterized in that a knowledge graph is matched with a corresponding power grid state according to data characteristics, then paths traversed by various operations between state nodes are searched, and an adjustment strategy is automatically generated, so that intelligent adjustment of AC/DC multi-section power is realized. The specific process is as follows:
1. acquiring knowledge from an alternating current-direct current multi-section power adjustment process, a guide rule specification and manual experience;
2. dividing the acquired knowledge into 4 types of power grid states, data characteristics, adjustment rules and adjustment means;
3. expressing knowledge in the form of < node, relation, node > triplets, and defining different nodes and relations according to different classifications;
4. constructing a knowledge graph according to a state transition process, and matching states based on data characteristics and priorities;
5. determining the adjusting means and the execution sequence of the matched states according to the adjusting rules;
6. after the adjustment is executed, the section power is recalculated according to the new condition, and whether the section power reaches the target value is judged. If so, finishing the adjustment; if not, steps 1-5 are repeated.
The method designs the adjustment process of the target power of the alternating current section, the direct current section, the single section and the multi-section, and adjusts the alternating current section after adjusting the direct current section by defining the priority of the adjustment state, so as to prevent mutual influence in the adjustment process of the alternating current and direct current sections; by means of the adjusting mode combining the unit grouping and the coarse adjustment and the fine adjustment, the problem that the sections are affected mutually among the sections with close coupling relation is effectively solved. An intelligent AC/DC multi-section power adjustment method flow based on knowledge driving is established, a knowledge graph is matched with a corresponding power grid state according to data characteristics, then paths traversed by various operations between state nodes are searched, and an adjustment strategy is automatically generated, so that intelligent adjustment of AC/DC multi-section power is realized.
In the embodiment 1 of the invention, a northeast actual power grid 2179 node system example is adopted for verification, and the method of the invention is applied to the example to intelligently adjust a plurality of direct current sections and alternating current sections through a knowledge graph so as to enable the direct current sections and the alternating current sections to reach the set power target value. The test result verifies the effectiveness of the invention.
1. The section definition and target power setting are shown in tables 1 and 2
TABLE 1 DC section and target Power
| DC section name | Mode of operation | Very 1 target power | Polar 2 target power |
| DC1009 | Bipolar operation | 1000MW | 600MW |
| DC1002 | Unipolar operation | 300MW | 0MW |
TABLE 2 AC Cross section and target Power
| Name of AC section | Number of branches in cross section | Target power of |
| Section | ||
| 1 | 3 | 2500MW |
| Section 2 | 4 | 1200MW |
2. Single test data adjustment flow specification
1 set of test data was selected to explain the adjustment process of the present invention in detail. The DC section DC1009 of the group of test data has the power of 1000MW at the current pole 1 and 1000MW at the pole 2; the DC section DC1002 has a current pole 1 power of 500MW and a pole 2 power of 0MW. The current power of the AC section 1 is 1950.15MW, and the current power of the section 2 is 1600.00MW.
And 2, according to knowledge < direct current section adjustment state, operation exists, direct current section power adjustment > → < direct current section power adjustment, operation exists, direct current section power deviation amount > → < direct current section power adjustment exists, operation exists, the adjustable generator set at the direct current section transmitting and receiving end > → < direct current section power adjustment exists, operation exists, the output of the generator set is adjusted according to output margin > → < direct current section power adjustment exists, operation exists, and the active output of the generator is modified so as to adjust the active output of the generator. The adjustment scheme is shown in table 3:
TABLE 3 DC CROSS-SECTION ADJUSTMENT SCHEME
| Adjusting generator name | Pre-adjustment state | Adjusted state | Active power output before regulation | Adjusted active power output |
| 426 | Operation of | Operation of | 600MW | 200MW |
| 365 | Operation of | Operation of | 800MW | 600MW |
| 382 | Off-stream | Operation of | 0MW | 300MW |
| 377 | Out of service | Operation of | 0MW | 300MW |
And 3, adjusting the voltage of the direct current bus to be 1.0 within a limit range. According to knowledge < the state of the DC section adjustment, if any, performing DC voltage out-of-limit adjustment > → < performing DC voltage out-of-limit adjustment, if any, judging whether the DC voltage is out-of-limit, and then not performing the DC voltage adjustment.
And step 4, adjusting the active power of the balance machine to 349.2MW within a limit range. According to knowledge, namely < the DC section adjustment state, operation exists, the balancer overrun adjustment is carried out > → < the DC voltage overrun adjustment is carried out, and if the operation exists, whether the active output of the balancer is overrun is judged, the balancer overrun adjustment is not carried out.
And 5, recalculating the power of the direct current section, wherein the power of the direct current section reaches a target value, and the adjustment of the direct current section is finished.
And 6, according to knowledge, the AC section adjusting state is characterized in that the difference value between the current power and the target power of the AC section is more than 20MW and the AC section adjusting state has a weight of 1, and the AC section adjusting state is entered.
And 7, according to knowledge < alternating current section adjustment state, operation exists, alternating current section power adjustment > → < alternating current section power adjustment exists, operation exists, alternating current section power deviation amount > → < alternating current section power adjustment exists, operation exists, alternating current section transmitting and receiving end adjustable generator set > → < alternating current section power adjustment exists, operation exists, unit output is adjusted according to output margin > → < alternating current section power adjustment exists, operation exists, generator active output is modified, and generator active output is adjusted. The adjustment scheme is shown in table 4:
TABLE 4 adjustment scheme for AC section
| Adjusting generator name | Pre-adjustment state | Adjusted state | Active power output before regulation | Adjusted active power output |
| 262 | Out of service | Operation of the device | 0MW | 100MW |
| 220 | Out of service | Operation of the device | 0MW | 300MW |
| 199 | Off-stream | Operation of | 0MW | 149.85MW |
| 329 | Operation of the device | Operation of | 360MW | 0MW |
| 330 | Operation of the device | Operation of | 600MW | 410.15MW |
And 8, recalculating the power of the alternating current section, wherein the power of the alternating current section reaches a target value, and finishing the adjustment of the alternating current section.
3. Test data set adjustment effect analysis
In order to verify the effectiveness and the adaptability of the method provided by the invention to power grids with different characteristics, 4417 groups of test data with different section powers are generated to form a test data set by combining the switching conditions of a generator, a load and a capacitance reactor on the basis of the initial power flow. The adjustment results are shown in table 5:
table 5 test data set 1 adjustment results
| Adjusted state | Number of samples |
| All direct current sections reach the target | 4417 |
| Part of the DC cross section reaches the target | 0 |
| All DC sections fail to reach the target | 0 |
| All alternating current sections reach the target | 4415 |
| Part of the AC section reaches the target | 0 |
| All AC sections fail to reach the target | 0 |
| Adjustment of non-convergence | 2 |
| Adjustment success rate | 99.95% |
In embodiment 2 of the present invention, in order to test the effectiveness and adaptability of the method provided by the present invention in a large-scale power grid, a northwest actual power grid 14127 node system example is used for verification. The profile definition and target power setting are shown in tables 6 and 7:
TABLE 6 DC section and target power
| DC section name | Mode of | Pole | 1 target power | Polar 2 target power |
| Direct current in the sky | Bipolar operation | 3500MW | 3500MW |
TABLE 7 AC section and target Power
| Name of AC section | Number of branches in cross section | Target power of cross section |
| Xinjiang delivery | 4 | 3800MW |
| Ganxi Shanxi | 4 | 5500MW |
1332 groups of test data of different section powers are generated by combining the switching conditions of a generator, a load and a capacitance reactor on the basis of the initial tide. The adjustment results are shown in table 8:
table 8 test data set 2 adjustment results
| Adjusted state | Number of samples |
| All direct current sections reach the target | 1332 |
| Part of the direct current section reaches the target | 0 |
| All DC sections fail to reach the target | 0 |
| All alternating current sections reach the target | 1227 |
| Part of the alternating section reaches the target | 0 |
| All AC sections fail to reach the target | 0 |
| Adjustment of non-convergence | 105 |
| Adjustment success rate | 92.12% |
As can be seen from the table, after adjustment, the alternating current and direct current sections achieve 1127 groups of data of the target power, the adjustment success rate is 92.12%, and the engineering and actual requirements are met. The intelligent adjustment time of an average group of test data is 8.288 seconds, compared with a manual adjustment method, the method greatly improves the adjustment speed and efficiency, saves the labor and reduces the workload.
Fig. 3 is a schematic structural diagram of a large power grid ac/dc multi-section power regulation system 300 according to an embodiment of the present invention. As shown in fig. 3, the ac/dc multi-section power regulation system 300 for a large power grid according to an embodiment of the present invention includes: a power deviation amount calculation unit 301, an adjustable generator set determination unit 302 and an adjustment unit 303.
Preferably, the power deviation amount calculating unit 301 is configured to calculate the power deviation amount based on the section type of the target section, the current power, and the target power.
Preferably, the calculating unit 301 of power deviation amount based on the type of the target cross section, the current power and the target power calculates the power deviation amount, and includes:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following method, including:
wherein ,
is the amount of power deviation;
and
target power of a direct current section and a alternating current section respectively;
and
the current power of the direct current section and the current power of the alternating current section are respectively;
and
the power of the pole 1 and the power of the pole 2 of the direct current cross section are respectively.
Preferably, the adjustable generator set determining unit 302 is configured to determine an adjustable generator set associated with the target cross section when the absolute value of the power deviation is greater than a preset power deviation threshold.
Preferably, the determining unit 302 of the adjustable generator set determines the adjustable generator set associated with the target cross section when the absolute value of the power deviation is greater than a preset power deviation threshold, including:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraints include:
wherein ,
the node type of the generator set;
the active power output of the generator set is obtained;
the active output upper limit of the generator set is set;
the lower limit of active output of the generator set.
Preferably, the adjusting unit 303 is configured to determine an output adjustment amount of an adjustable generator set associated with the target cross section based on the power deviation amount, and perform adjustment based on the output adjustment amount, so that an absolute value of the power deviation amount is smaller than a preset power deviation amount threshold, and the adjustment of the cross section power is completed.
Preferably, the adjusting unit 303, determining a power output adjustment amount of the adjustable generator set associated with the target cross section based on the power deviation amount, includes:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets which participate in adjustment of the section sending end and the section receiving end is respectively;
generating set for transmitting end to cross section
The increased active power of the electric motor is increased,
the active power reduced for the section receiving end generator set j;
for sending end generator set
The start-stop sign of (1) is set,
a start-stop sign of a receiving-end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving-end generator set j is obtained;
for the current active power of the sending-end genset i,
the current active power of the receiving end generator set j;
when the temperature is higher than the set temperature
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein , 
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and is the maximum value of the active power of the receiving end generator set j.
Preferably, wherein the system further comprises:
and the alternating current section initial adjusting unit is used for traversing all alternating current sections needing to be adjusted before calculating the power deviation amount based on the section type, the current power and the target power of the target section, selecting an adjustable generator set only connected with any one alternating current section for any one alternating current section, and adjusting any one alternating current section based on the adjustable generator set only connected with any one alternating current section.
Preferably, wherein the system further comprises:
a first judgment result obtaining unit, configured to, when the type of the target cross section is a dc cross section, judge whether the regulated dc bus voltage is out of limit based on a preset dc bus voltage upper and lower limit value, and obtain a first judgment result;
the direct-current bus voltage out-of-limit adjusting unit is used for adjusting reactive compensation equipment associated with the direct-current bus when the first judgment result indicates that the direct-current bus voltage is out of limit;
the second judgment result acquisition unit is used for judging whether the balancing machine is out of limit or not based on the preset active power output limit value of the balancing machine and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the output of the generator related to the balancing machine when the second judgment result indicates that the output of the balancing machine is out of limit.
Preferably, when the first determination result indicates that the dc bus voltage is out of limit, the dc bus voltage out-of-limit adjusting unit adjusts reactive compensation equipment associated with the dc bus, including:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the preset voltage of the direct current bus, the parallel capacitor connected with the direct current bus of any stage and with the branch within the first preset stage is withdrawn, and the parallel reactor connected with the direct current bus of any stage and with the branch within the first preset stage is put in;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the preset lower limit of the voltage of the direct current bus, the shunt reactor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is withdrawn, and the shunt capacitor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is added.
Preferably, the balancing machine output out-of-limit adjusting unit, when the second determination result indicates that the balancing machine output is out-of-limit, adjusts the generator output associated with the balancing machine, including:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the preset balancing machine, inputting a generator set which is connected with a branch of the balancing machine within a second preset number of stages and is in a shutdown state, or increasing the output of the generator set which is connected with the branch of the balancing machine within the second preset number of stages and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set which is connected with the branch within a second preset number and is in the running state.
The ac/dc multi-section power adjustment system 300 of the large power grid according to the embodiment of the present invention corresponds to the ac/dc multi-section power adjustment method 100 of the large power grid according to another embodiment of the present invention, and is not described herein again.
Based on another aspect of the invention, the invention provides a computer readable storage medium, on which a computer program is stored, which program, when executed by a processor, performs the steps of any one of the methods for large grid ac/dc multi-section power regulation.
Based on another aspect of the present invention, the present invention provides an electronic device comprising:
the computer-readable storage medium described above; and
one or more processors to execute the program in the computer-readable storage medium.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (18)
1. A method for adjusting alternating current/direct current multi-section power of a large power grid is characterized by comprising the following steps:
calculating a power deviation amount based on the section type of the target section, the current power and the target power;
when the absolute value of the power deviation amount is larger than a preset power deviation amount threshold value, determining an adjustable generator set associated with the target section;
and determining an output adjustment amount of an adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power.
2. The method of claim 1, wherein calculating the power deviation amount based on the section type of the target section, the current power, and the target power comprises:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following modes:
wherein ,
is the amount of power deviation;
and
target power of a direct current section and a alternating current section respectively;
and
respectively a DC section and an AC sectionThe current power of the face;
and
the power of the pole 1 and the power of the pole 2 of the direct current section are respectively.
3. The method of claim 1, wherein determining an adjustable generator set associated with the target cross-section when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold comprises:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraints include:
wherein ,
the node type of the generator set;
the active power output of the generator set is obtained;
the active output upper limit of the generator set is set;
is a generator setLower limit of work output.
4. The method of claim 1, wherein determining a contribution adjustment for an adjustable generator set associated with the target profile based on the amount of power deviation comprises:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets which participate in adjustment of the section sending end and the section receiving end is respectively;
generating set with section as sending end
The increased active power of the electric motor is increased,
the active power reduced for the section receiving end generator set j;
for sending end generator set
The start-stop flag of (1) is set,
a start-stop sign of a receiving-end generator set j;
is the maximum value of the active power of the sending-end generator set i,
the minimum value of the active power of the receiving-end generator set j is obtained;
for the current active power of the sending-end generator set i,
the current active power of the receiving end generator set j;
when the temperature is higher than the set temperature
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein ,
the active power reduced for the section sending end generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and the maximum value of the active power of the receiving end generator set j.
5. The method of claim 1, further comprising: before said calculating the power deviation amount based on the section type of the target section, the current power and the target power,
and traversing all the alternating current sections needing to be adjusted, selecting an adjustable generator set only connected with any one alternating current section for any one alternating current section, and adjusting any one alternating current section based on the adjustable generator set only connected with any one alternating current section.
6. The method of claim 1, further comprising:
when the section type of the target section is a direct current section, judging whether the regulated direct current bus voltage is out of limit or not based on the preset upper and lower limit values of the direct current bus voltage, and acquiring a first judgment result;
when the first judgment result indicates that the voltage of the direct-current bus is out of limit, adjusting reactive compensation equipment associated with the direct-current bus;
judging whether the balancing machine is out of limit or not based on the preset active output limit value of the balancing machine, and obtaining a second judgment result;
adjusting a generator output associated with the balancing machine when the second determination indicates an out-of-limit balancing machine output.
7. The method of claim 6, wherein when the first determination indicates that the dc bus voltage is out of limit, adjusting reactive compensation equipment associated with the dc bus comprises:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the preset voltage of the direct current bus, the parallel capacitor connected with the direct current bus of any stage and with the branch within the first preset stage is withdrawn, and the parallel reactor connected with the direct current bus of any stage and with the branch within the first preset stage is put in;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the lower limit of the preset voltage of the direct current bus, the shunt reactor connected with the direct current bus of any stage and provided with the branch within the first preset stage is withdrawn, and the shunt capacitor connected with the direct current bus of any stage and provided with the branch within the first preset stage is added.
8. The method of claim 6, wherein the adjusting the generator output associated with the balancing machine when the second determination indicates a balanced machine output overrun comprises:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the balancing machine, inputting a generator set which is connected with a branch within a second preset number of stages of the balancing machine and is in a shutdown state, or increasing the output of the generator set which is connected with the branch within the second preset number of stages of the balancing machine and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set which is connected with the branch within a second preset number and is in the running state.
9. A large power grid alternating current-direct current multi-section power regulation system is characterized by comprising:
the power deviation amount calculating unit is used for calculating the power deviation amount based on the section type of the target section, the current power and the target power;
the adjustable generator set determining unit is used for determining an adjustable generator set associated with the target section when the absolute value of the power deviation amount is larger than a preset power deviation amount threshold;
and the adjusting unit is used for determining the output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount, and adjusting based on the output adjustment amount so as to enable the absolute value of the power deviation amount to be smaller than a preset power deviation amount threshold value, thereby completing the adjustment of the section power.
10. The system according to claim 9, wherein the power deviation amount calculation unit calculates the power deviation amount based on the section type of the target section, the current power, and the target power, and includes:
when the section type is a direct current section, determining the power deviation value by using the following method, including:
when the section type is an alternating current section, determining the power deviation value by using the following modes:
wherein ,
is the amount of power deviation;
and
target power of a direct current section and a alternating current section respectively;
and
the current power of the direct current section and the current power of the alternating current section are respectively;
and
the power of the pole 1 and the power of the pole 2 of the direct current section are respectively.
11. The system of claim 9, wherein the adjustable generator set determining unit determines the adjustable generator set associated with the target cross-section when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold, and comprises:
when the absolute value of the power deviation is larger than a preset power deviation threshold, searching for connected generator sets from a section sending end bus and a section receiving end bus according to the electrical distance;
for any connected generator set, if the any connected generator set meets preset constraints, determining that the any connected generator set is an adjustable generator set associated with the target section;
wherein the preset constraint comprises:
wherein ,
the node type of the generator set;
the active output of the generator set is obtained;
the active output upper limit of the generator set is set;
the lower limit of active output of the generator set.
12. The system of claim 9, wherein the adjustment unit, based on the amount of power deviation, determines an amount of output adjustment for an adjustable generator set associated with the target profile, comprising:
when in use
And then, increasing output at the sending end, reducing output at the receiving end, and determining the output adjustment quantity of the adjustable generator set associated with the target section by using the following method, wherein the method comprises the following steps:
wherein ,
is the amount of power deviation;
is a preset power deviation value threshold value;
、
the power adjusted for the sending end and the receiving end of the section respectively;
、
the number of adjustable generator sets which participate in adjustment of the section sending end and the section receiving end is respectively;
generating set with section as sending end
The increased active power of the electric motor is increased,
the active power reduced for the section receiving end generator set j;
generating set for transmitting end
The start-stop sign of (1) is set,
a start-stop sign of a receiving end generator set j;
is the active power of the generator set i at the sending endBig (a) value of,
the minimum value of the active power of the receiving-end generator set j is obtained;
for the current active power of the sending-end generator set i,
the current active power of the receiving end generator set j is obtained;
when the temperature is higher than the set temperature
And then, the sending end reduces the output, the receiving end increases the output, and the output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, including:
wherein ,
is a cross-section delivery endThe reduced active power of the generator set i,
the active power is increased for the section sending end generator set j;
is the minimum value of the active power of the sending-end generator set i,
and the maximum value of the active power of the receiving end generator set j.
13. The system of claim 9, further comprising:
and the alternating current section initial adjusting unit is used for traversing all alternating current sections needing to be adjusted before calculating the power deviation amount based on the section type, the current power and the target power of the target section, selecting an adjustable generator set only connected with any one alternating current section for any one alternating current section, and adjusting any one alternating current section based on the adjustable generator set only connected with any one alternating current section.
14. The system of claim 9, further comprising:
a first judgment result obtaining unit, configured to, when the type of the target cross section is a dc cross section, judge whether the regulated dc bus voltage is out of limit based on a preset dc bus voltage upper and lower limit value, and obtain a first judgment result;
the direct-current bus voltage out-of-limit adjusting unit is used for adjusting reactive compensation equipment associated with the direct-current bus when the first judgment result indicates that the direct-current bus voltage is out of limit;
the second judgment result acquisition unit is used for judging whether the balancing machine is out of limit or not based on the preset active power output limit value of the balancing machine and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the output of the generator related to the balancing machine when the second judgment result indicates that the output of the balancing machine is out of limit.
15. The system according to claim 14, wherein the dc bus voltage out-of-limit adjusting unit, when the first determination result indicates that the dc bus voltage is out-of-limit, adjusts reactive compensation equipment associated with the dc bus, and comprises:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is greater than the upper limit of the preset voltage of the direct current bus, the parallel capacitor connected with the direct current bus of any stage and with the branch within the first preset stage is withdrawn, and the parallel reactor connected with the direct current bus of any stage and with the branch within the first preset stage is put in;
for any stage, if the second judgment result indicates that the voltage of the direct current bus is smaller than the preset lower limit of the voltage of the direct current bus, the shunt reactor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is withdrawn, and the shunt capacitor connected with the branch circuit of the direct current bus of any stage within the first preset stage number is added.
16. The system of claim 14, wherein the balancing machine out-of-limit adjustment unit, when the second determination indicates a balancing machine out-of-limit, adjusts the generator out-of-output associated with the balancing machine, comprising:
if the first judgment result indicates that the output of the balancing machine is greater than the upper limit of the active output of the preset balancing machine, inputting a generator set which is connected with a branch of the balancing machine within a second preset number of stages and is in a shutdown state, or increasing the output of the generator set which is connected with the branch of the balancing machine within the second preset number of stages and is in an operating state;
and if the first judgment result indicates that the output of the balancing machine is smaller than the lower limit of the active output of the preset balancing machine, reducing the output of the generator set which is connected with the branch within a second preset number and is in the running state.
17. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
18. An electronic device, comprising:
the computer-readable storage medium recited in claim 17; and
one or more processors to execute the program in the computer-readable storage medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211451501.2A CN115579967B (en) | 2022-11-21 | 2022-11-21 | Power adjustment method and system for large power grid AC/DC multi-section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211451501.2A CN115579967B (en) | 2022-11-21 | 2022-11-21 | Power adjustment method and system for large power grid AC/DC multi-section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115579967A true CN115579967A (en) | 2023-01-06 |
| CN115579967B CN115579967B (en) | 2023-04-28 |
Family
ID=84589324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211451501.2A Active CN115579967B (en) | 2022-11-21 | 2022-11-21 | Power adjustment method and system for large power grid AC/DC multi-section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115579967B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018049737A1 (en) * | 2016-09-18 | 2018-03-22 | 国电南瑞科技股份有限公司 | Safe correction calculation method based on partition load control |
| CN109873428A (en) * | 2019-04-10 | 2019-06-11 | 国家电网公司华中分部 | A kind of more method for controlling section power and system towards bulk power grid |
| CN111900767A (en) * | 2020-03-25 | 2020-11-06 | 中国电力科学研究院有限公司 | Method and system for controlling multi-section active power flow of power system |
| CN112332408A (en) * | 2020-10-22 | 2021-02-05 | 云南电网有限责任公司 | Power transmission section tide adjusting method and device for power system |
| CN113890041A (en) * | 2021-12-03 | 2022-01-04 | 中国电力科学研究院有限公司 | Method and device for automatically adjusting power flow of power grid operation mode |
-
2022
- 2022-11-21 CN CN202211451501.2A patent/CN115579967B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018049737A1 (en) * | 2016-09-18 | 2018-03-22 | 国电南瑞科技股份有限公司 | Safe correction calculation method based on partition load control |
| CN109873428A (en) * | 2019-04-10 | 2019-06-11 | 国家电网公司华中分部 | A kind of more method for controlling section power and system towards bulk power grid |
| CN111900767A (en) * | 2020-03-25 | 2020-11-06 | 中国电力科学研究院有限公司 | Method and system for controlling multi-section active power flow of power system |
| CN112332408A (en) * | 2020-10-22 | 2021-02-05 | 云南电网有限责任公司 | Power transmission section tide adjusting method and device for power system |
| CN113890041A (en) * | 2021-12-03 | 2022-01-04 | 中国电力科学研究院有限公司 | Method and device for automatically adjusting power flow of power grid operation mode |
Non-Patent Citations (3)
| Title |
|---|
| 丁平等: "大型互联电网多断面功率约束潮流算法", 《中国电机工程学报》 * |
| 徐正清等: "基于灵敏度及粒子群算法的输电断面功率越限控制方法对比研究", 《电力系统保护与控制》 * |
| 辛阔等: "南方电网交流输电断面极限控制难点与对策", 《南方电网技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115579967B (en) | 2023-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Vazquez et al. | A fully decentralized adaptive droop optimization strategy for power loss minimization in microgrids with PV-BESS | |
| CN109524979B (en) | Alternating current-direct current interconnected power grid continuous power flow model containing VSC-MTDC | |
| CN109842122B (en) | Low-voltage treatment method for low-voltage transformer area | |
| CN110198044B (en) | LCC-HVDC commutation failure immunity evaluation method and system considering transmission power limit | |
| CN109638822B (en) | Load recovery strategy online formulation method and system considering transient and static constraints | |
| CN115579967B (en) | Power adjustment method and system for large power grid AC/DC multi-section | |
| CN111244944B (en) | Method for evaluating reliability of alternating current-direct current power distribution network based on influence increment | |
| CN111355241A (en) | Alternating current-direct current hybrid micro-grid droop coefficient selection method based on tidal current feasible region | |
| CN113890039B (en) | Multi-terminal flexible direct-current power distribution network power flow scheduling optimization method | |
| CN110994621B (en) | Power grid active power flow adjusting method and device based on improved direct current power flow algorithm | |
| CN110751328A (en) | High-proportion renewable energy power grid adaptive planning method based on joint weighted entropy | |
| CN113725910B (en) | Stability analysis and quantitative evaluation method for wind power plant grid-connected system | |
| CN108390388A (en) | Eliminate the aid decision computational methods of THE UPFC near region apparatus overload | |
| CN113722881B (en) | Generator phase advance limit calculation method, equipment and medium based on parameter identification | |
| CN115940280A (en) | Distributed phase modulator configuration method and system of high-proportion new energy delivery system | |
| CN116470522B (en) | Control parameter identification method and device for SVG universal electromagnetic transient model | |
| CN111368489B (en) | Test sequence modeling method and device for multi-terminal direct current transmission system | |
| CN111030119B (en) | Power grid reactive power flow adjusting method and device based on improved direct current flow algorithm | |
| CN110707762A (en) | Multi-energy complementary alternating current-direct current hybrid micro-grid load flow feasible region calculation method | |
| CN113809779B (en) | Stability inspection method for wind farm when connected into flexible direct system | |
| CN113241792B (en) | Method and device for planning grid-connected machine type of power electronic power supply | |
| CN113688537B (en) | Distribution network relay protection parameter extraction method based on ENTSILDig software | |
| Du et al. | Three-phase Power Flow Calculation and Static Voltage Stability Analysis of Low Voltage Distribution Network | |
| Yi et al. | Automatic Parameter Optimization Based on High-Efficiency Simulation Model of Regional Energy Router | |
| Lu et al. | A fast power flow algorithm for islanded AC/DC microgrids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |