CN115579967B - Power adjustment method and system for large power grid AC/DC multi-section - Google Patents
Power adjustment method and system for large power grid AC/DC multi-section Download PDFInfo
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- CN115579967B CN115579967B CN202211451501.2A CN202211451501A CN115579967B CN 115579967 B CN115579967 B CN 115579967B CN 202211451501 A CN202211451501 A CN 202211451501A CN 115579967 B CN115579967 B CN 115579967B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
The invention discloses a power adjustment method and a system for AC/DC multi-section of a large power grid, 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 is larger than a preset power deviation threshold value, determining an adjustable generator set associated with the target section; and determining the output adjustment quantity of the adjustable generator set based on the power deviation quantity, and adjusting based on the output adjustment quantity so that the absolute value of the power deviation quantity is smaller than a preset power deviation quantity threshold value to complete the adjustment of the section power. The invention firstly carries out rough adjustment and then fine adjustment through the component groups when the alternating current section is adjusted, can effectively avoid the problem of mutual influence among a plurality of sections, comprehensively considers the voltage out-of-limit and balance machine out-of-limit conditions possibly occurring in the adjustment process for the direct current section, ensures that the adjustment result meets the requirements of practical engineering application, can greatly improve the adjustment speed and efficiency, saves manpower and lightens the workload.
Description
Technical Field
The invention relates to the technical field of current system simulation, in particular to a method and a system for adjusting power of alternating current and direct current multi-section of a large power grid.
Background
The power grid section power adjustment is an important link in the safety and stability analysis and operation mode arrangement work of the power system. Along with the rapid development of the alternating current-direct current series-parallel connection power grid, the energy transmission change among areas is more severe, and the power flowing through the alternating current section and the direct current section is required 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 force of the section sending and receiving end unit by adopting a trial-and-error method according to working experience until the section power reaches a target value. The adjustment effect varies from person to person and the accuracy cannot be ensured; the adjustment workload is large, and a great deal of manpower and energy are consumed; the mutual influence among a plurality of coupling sections is difficult to consider, and multiple constraints such as voltage, balancing machine can not be satisfied simultaneously in the adjustment process, and the requirement of operation mode diversity and comprehensiveness is difficult to satisfy to influence the accuracy of electric wire netting safety and stability analysis. Therefore, the intelligent adjustment of the section power is of great significance to the improvement of the automation level of the power grid operation mode calculation.
At present, the existing section power adjustment method mainly aims at a single section, and mainly adopts a tidal current section constraint method, a sensitivity class method and an optimal control method. The power flow section constraint method is to expand a conventional power flow calculation method, increase constraint conditions of section power, and repeatedly calculate power flow through repeated iterative adjustment until the section power approaches a target value. The method is simple in principle and easy to implement, but the calculated amount is large, and the calculated speed is difficult to meet the requirement. The sensitivity method is to calculate sensitivity index, select the machine set with big influence on the section power to adjust, and to use the reverse equivalent pairing principle to determine the adjustment amount, which can meet the engineering requirement in practice. However, the sensitivity index is closely related to the operation mode, the sensitivity is to be recalculated for different data, the sensitivity index can only reflect the influence of the unit on a single section, the influence on other branches is difficult to be considered, or the limitation of the adjustment direction or the priority of the adjustment measures leads to the reduction of the degree of freedom of the adjustment measure combination, and the optimal solution may be omitted or even no solution is caused. The optimal control method generally takes the minimum sum of absolute values of adjustment amounts or the minimum generation cost represented by a quadratic function as a control target, and adopts nonlinear programming, an original dual interior point method and other optimization algorithms to solve to obtain the output of each unit.
Therefore, a section power adjusting method which is applicable to a large-scale alternating-current and 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 power of an alternating current/direct current multi-section of a large power grid, which are used for solving the problem of how to adjust the power of the section of the power grid.
In order to solve the above problems, according to an aspect of the present invention, there is provided a power adjustment method for ac/dc multi-section of a large power grid, the method comprising:
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 quantity of the adjustable generator set related to the target section based on the power deviation quantity, and adjusting based on the output adjustment quantity so that the absolute value of the power deviation quantity is smaller than a preset power deviation quantity threshold value to complete the adjustment of the section power.
Preferably, wherein 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 amount by using the following method comprises the following steps:
when the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively;
and />
The current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively.
Preferably, the determining the adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold comprises:
when the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; / >
The upper limit of the active output of the generator set; />
Is the lower limit of the active output of the generator set.
Preferably, wherein the determining the output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount includes:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
The current active power of the receiving-end generator set j;
when (when)
When the power transmission end reduces the power output, the power reception end increases the power output, and the power output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein , 
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum active power of the receiving-end generator set j.
Preferably, wherein the method further comprises: before the calculation of 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 cross sections to be adjusted, selecting an adjustable generator set connected with any one alternating current cross section, and adjusting any one alternating current cross section based on the adjustable generator set connected with any one alternating current cross section.
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 upper limit value and the lower limit value of the preset direct current bus voltage, and acquiring a first judgment result;
when the first judging result indicates that the voltage of the direct current bus is over, reactive power compensation equipment associated with the direct current bus is adjusted;
judging whether the balance machine is out of limit or not based on a preset active force limit value of the balance machine, and acquiring a second judgment result;
And when the second judging result indicates that the output of the balancing machine is beyond, adjusting the output of the generator associated with the balancing machine.
Preferably, when the first judgment result indicates that the voltage of the direct current bus is over the limit, adjusting reactive power compensation equipment associated with the direct current bus comprises:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
and 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
Preferably, the adjusting the generator output associated with the balancing machine when the second determination result indicates that the balancing machine output is beyond the limit includes:
If the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
According to another aspect of the present invention, there is provided a large grid ac/dc multi-section power conditioning system, the system comprising:
a power deviation amount calculation unit for calculating a power deviation amount based on a section type of the target section, the current power, and the target power;
an adjustable generator set determining unit, configured to determine an adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold;
and the adjusting unit is used for determining the output force adjusting quantity of the adjustable generator set related to the target section based on the power deviation quantity and adjusting based on the output force adjusting quantity so that the absolute value of the power deviation quantity is smaller than a preset power deviation quantity threshold value to finish the adjustment of the section power.
Preferably, wherein the power deviation amount calculation unit calculates the power deviation amount based on a section type of the target section, the current power, and the target power, including:
when the section type is a direct current section, determining the power deviation amount by using the following method comprises the following steps:
when the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively;
and />
The current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively.
Preferably, the adjustable generator set determining unit determines an adjustable generator set associated with the target section when the absolute value of the power deviation amount is greater than a preset power deviation amount threshold, including:
when the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; />
The upper limit of the active output of the generator set; />
Is the lower limit of the active output of the generator set.
Preferably, the adjusting unit determines an output adjustment amount of an adjustable generator set associated with the target section based on the power deviation amount, including:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
Is the start of the receiving end generator set jA stop sign; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for >
The current active power of the receiving-end generator set j;
when (when)
When the power transmission end reduces the power output, the power reception end increases the power output, and the power output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps: />
wherein , 
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum 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 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 connected with any one alternating current section.
Preferably, wherein the system further comprises:
the first judgment result acquisition unit is used for judging whether the regulated direct current bus voltage is out of limit or not based on the upper limit value and the lower limit value of the preset direct current bus voltage when the section type of the target section is a direct current section, and acquiring a first judgment result;
The direct current bus voltage out-of-limit adjusting unit is used for adjusting reactive power compensation equipment associated with the direct current bus when the first judging result indicates that the direct current bus voltage is out-of-limit;
the second judgment result acquisition unit is used for judging whether the balance machine is out of limit or not based on a preset balance machine active force limit value, and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the generator output associated with the balancing machine when the second judging result indicates that the balancing machine output is out-of-limit.
Preferably, the dc bus voltage out-of-limit adjustment unit adjusts the reactive compensation device associated with the dc bus when the first determination result indicates that the dc bus voltage is out-of-limit, including:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
and 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
Preferably, the balancing machine output out-of-limit adjustment unit adjusts the generator output associated with the balancing machine when the second determination result indicates that the balancing machine output is out-of-limit, and includes:
if the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
Based on another aspect of the present invention, the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of any one of the large grid ac/dc multi-profile power adjustment methods.
Based on another aspect of the present invention, the present invention provides an electronic device, including:
The computer readable storage medium as described above; and
one or more processors configured to execute the programs in the computer-readable storage medium.
The invention provides a power adjustment method and a system for AC/DC multi-section of a large power grid, 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 is larger than a preset power deviation threshold, determining an adjustable generator set associated with the target section; and determining the output adjustment quantity of the adjustable generator set related to the target section based on the power deviation quantity, and adjusting based on the output adjustment quantity so that the absolute value of the power deviation quantity is smaller than a preset power deviation quantity threshold value to complete 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 component groups when the alternating current section is adjusted, then carries out fine adjustment, can effectively avoid the problem of mutual influence among a plurality of sections, comprehensively considers the voltage out-of-limit and the balance machine out-of-limit conditions possibly occurring in the adjustment process for the direct current section, ensures that the adjustment result meets the requirements of practical engineering application, can greatly improve the adjustment speed and the adjustment efficiency, saves manpower and lightens the workload.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method 100 for regulating power of a large grid AC/DC multi-section according to an embodiment of the invention;
FIG. 2 is a flow chart of DC multi-section power adjustment according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a large grid ac/dc multi-section power conditioning 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 examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the 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, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms 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 adjusting ac/dc multi-section power of a large power grid according to an embodiment of the present invention. As shown in fig. 1, the method for adjusting ac/dc multi-section power of a large power grid according to the embodiment of the present invention adjusts ac section and dc section power based on the power deviation amount, and when the ac section is adjusted, coarse adjustment is performed through component groups, then fine adjustment is performed, so that the problem that a plurality of sections are affected by each other can be effectively avoided, and as for the dc section, voltage out-of-limit and balancing machine out-of-limit conditions possibly occurring in the adjustment process are comprehensively considered, so that the adjustment result more meets the requirements of practical engineering application. The method 100 for adjusting the power of the alternating current and direct current multi-section of the large power grid provided by the embodiment of the invention starts from the step 101, and calculates the power deviation amount based on the section type of the target section, the current power and the target power in the step 101.
Preferably, wherein 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 amount by using the following method comprises the following steps:
when the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively;
and />
The current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively.
In the present invention, when adjusting the power of a cross section for any one of target cross sections, the power deviation amount is calculated first from the current power of the cross section and the target power.
Wherein, for the DC section, the rootCalculating the power deviation according to the current power and the target power of the DC section
The calculation formula is as follows:
wherein ,
and />
The power of the pole 1 and the power of the pole 2 which are respectively direct-current sections, and if the operation mode is monopolar operation, the corresponding pole power=0; />
The current power of the direct current section; />
The target power is the target power of the direct current section; />
Is the power deviation of the DC section.
For an alternating current section, calculating the power deviation according to the current power and the target power of the alternating current section, wherein the calculation formula is as follows:
wherein ,
is of alternating current cross sectionIs a current power of (2); />
The target power of the alternating current section; />
Is the power deviation of the alternating current section.
In step 102, when the absolute value of the power deviation is greater than a preset power deviation threshold, an adjustable generator set associated with the target section is determined.
Preferably, the determining the adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold comprises:
when the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; />
The upper limit of the active output of the generator set; />
Is the lower limit of the 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, the transmitting and receiving end is determined based on the power direction of the section, and the adjustable generator sets associated with the section are searched from the transmitting end of the section and the bus of the receiving end according to the electric distance, wherein the constraint conditions satisfied by the adjustable generator sets are as follows:
wherein ,
the node type of the generator set; / >
Active output of the generator set; />
The upper limit of the active output of the generator set; />
The lower limit of the active output of the generator set; the balancing machine, wind power, photoelectricity and other units without adjusting capability do not participate in adjustment.
In step 103, an output adjustment amount of the adjustable generator set associated with the target section is determined based on the power deviation amount, and adjustment is performed 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, and adjustment of the section power is completed.
Preferably, wherein the determining the output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount includes:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; / >
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
The current active power of the receiving-end generator set j;
when (when)
When the force is reduced by the transmitting end and increased by the receiving end, the following is usedDetermining an output adjustment amount of an adjustable generator set associated with the target section in a manner comprising:
wherein , 
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum 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 upper limit value and the lower limit value of the preset direct current bus voltage, and acquiring a first judgment result;
when the first judging result indicates that the voltage of the direct current bus is over, reactive power compensation equipment associated with the direct current bus is adjusted;
judging whether the balance machine is out of limit or not based on a preset active force limit value of the balance machine, and acquiring a second judgment result;
And when the second judging result indicates that the output of the balancing machine is beyond, adjusting the output of the generator associated with the balancing machine.
Preferably, when the first judgment result indicates that the voltage of the direct current bus is over the limit, adjusting reactive power compensation equipment associated with the direct current bus comprises:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
and 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
Preferably, the adjusting the generator output associated with the balancing machine when the second determination result indicates that the balancing machine output is beyond the limit includes:
If the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
In the invention, the output of the unit is regulated according to the reverse equivalent pairing principle no matter the unit is a direct current section or an alternating current section until the power deviation meets the threshold value. The adjustment principle is as follows:
(1) when (when)
In this case, the cross-sectional power needs to be increased. At this time, the output is increased by the transmitting end, the output is reduced by the receiving end, and the power adjustment quantity of the transmitting end and the receiving end is consistent.
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; / >
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
Is the current active power of the receiving end generator set j.
(2) When (when)
When the cross-sectional power needs to be reduced. At this time, the output force is reduced by the transmitting end, the output force is increased by the receiving end, and the power adjustment quantity of the transmitting end and the receiving end is consistent.
wherein , 
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum active power of the receiving-end generator set j.
In the present invention, as shown in fig. 2, after the adjustment, it is necessary to check whether the dc bus voltage on both sides of the dc section is 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. judging whether the voltage of the direct current buses at two sides of the adjusted direct current section is out of limit or not, wherein the judgment standard is as follows:
wherein ,
、 />
respectively the upper and lower limit values of the voltage of the direct current bus; />
、/>
The voltages of the direct current bus electrode 1 and the direct current bus electrode 2 are respectively.
2. If the voltage of any direct current bus is higher than the upper limit, the parallel capacitor connected with the branch circuit with less than 5 stages of direct current bus is withdrawn, and the parallel reactor connected with the branch circuit with less than 5 stages of direct current bus is put into operation.
3. If the voltage of any direct current bus is lower than the lower limit, the parallel reactor connected with the branch circuit with less than 5 stages of direct current bus is withdrawn, and the parallel capacitor connected with the branch circuit with less than 5 stages of direct current bus is put into.
In the invention, whether the whole-network balancing machine is out of limit after adjustment is checked, and if the whole-network balancing machine is out of limit, the output of a generator near the balancing machine is adjusted. The specific process comprises the following steps:
1. judging whether the active force of the balancing machine exceeds the limit or not after adjustment, wherein the judgment standard is as follows:
wherein , 
is a balance machine output.
2. If the balancing machine output is higher than the upper limit, the shutdown generator connected with the internal branch of 5 stages of the balancing machine is put into operation or the output of the operated generator connected with the internal branch of 5 stages of the balancing machine is increased.
3. If the balancing machine output is lower, the running generator output connected with the balancing machine with the internal branch of 5 stages or less is reduced.
In the invention, the direct current multi-section power adjustment flow comprises: firstly, adjusting the output of a generator according to the power deviation between the current power of a direct-current section and the target power; then, checking whether the voltage of the direct current bus is out of limit, and if so, adjusting reactive compensation equipment near the direct current bus; and finally, checking whether the regulated balancing machine is out of limit, and if so, regulating the output of the generator near the balancing machine. And (5) sequentially adjusting according to the direct current section sequence until all the targets are reached.
Preferably, wherein the method further comprises: before the calculation of 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 cross sections to be adjusted, selecting an adjustable generator set connected with any one alternating current cross section, and adjusting any one alternating current cross section based on the adjustable generator set connected with any one alternating current cross section.
In the invention, when alternating current multi-section power is adjusted, firstly, coarse adjustment is sequentially carried out on the power of each section according to the section sequence, and when an adjustable generator set is searched, the generator sets are grouped for reducing the mutual influence among the sections; and then, when all the sections are adjusted, fine adjustment is carried out on the sections with the section power which does not reach the target power.
The rough adjustment means that all alternating current sections needing to be adjusted are traversed firstly, an adjustable generator set connected with any alternating current section is selected for any alternating current section, and any alternating current section is adjusted based on the adjustable generator set connected with any alternating current section. The principle of group grouping refers to that when a generator with an adjustable section is searched, the searching range is a group connected with the section, and other sections cannot be penetrated through, so that the mutual influence between the coupling sections is avoided. The adjustment mode combining coarse adjustment and fine adjustment refers to that after all sections are adjusted in one round, the sections with smaller deviation between the section power and the target power are adjusted until the section power reaches the target power value. The fine adjustment process of the ac section is identical to the adjustment process of the dc section, and will not be described in detail here.
In the invention, the construction of the section adjustment knowledge graph can be also carried out, namely, the knowledge in the AC/DC multi-section adjustment process is extracted into nodes and relations in the knowledge graph according to the power grid state, the data characteristics, the adjustment rules and the adjustment means 4 types, and the three-way set is used for representing, and the section adjustment knowledge graph is constructed according to the state transition process.
Wherein, the section adjusts the node of the knowledge graph, includes: status nodes, feature nodes, operation nodes, attribute nodes, etc. For example, the DC section power adjusting state, the section power deviation amount is larger than the threshold value, and the adjustable generator set near the section and the active output of the generator are searched. The cross section adjusts the relation of the knowledge graph, comprising: characterized, operational, attributed, etc. The triplet knowledge representation means that the knowledge is described by adopting < nodes, relations and nodes >. For example: the direct-current section power adjustment state is characterized in that the deviation of the direct-current section power is larger than a threshold value >, < the direct-current section power adjustment state is operated, an adjustable generator set near the section is searched for >, < the adjustable generator set is provided with attributes, and the active power output of the generator >.
The knowledge-driven alternating current/direct current multi-section power intelligent adjustment method is characterized in that a knowledge graph is matched with corresponding power grid states according to data characteristics, various operation traversing paths among state nodes are searched, an adjustment strategy is automatically generated, and therefore intelligent adjustment of alternating current/direct current multi-section power is achieved. The specific flow is as follows:
1. acquiring knowledge from alternating current/direct current multi-section power adjustment flow, 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. the knowledge is represented in the form of a triplet of < nodes, relations, nodes > and different nodes and relations are defined according to different classifications;
4. constructing a knowledge graph according to a state transfer process, and matching states based on data characteristics and priorities;
5. determining an adjusting means and an executing sequence according to an adjusting rule for the matched state;
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, ending the adjustment; if not, repeating steps 1-5.
The method designs the adjustment flow of the target power of the alternating current section, the direct current section, the single section and the multiple sections, and the adjustment state priority is defined to firstly adjust the direct current section and then adjust the alternating current section so as to prevent the mutual influence in the adjustment process of the alternating current section and the direct current section; the problem of mutual influence among a plurality of sections is effectively avoided for the sections with close coupling relation by the adjustment mode of combining the component groups and the coarse adjustment and fine adjustment. The intelligent regulation method of the alternating current-direct current multi-section power based on knowledge driving is constructed, the corresponding power grid state is matched by the knowledge graph according to the data characteristics, then various operation traversed paths among the state nodes are searched, and the regulation strategy is automatically generated, so that the intelligent regulation of the alternating current-direct current multi-section power is realized.
In the embodiment 1 of the invention, the verification is performed by adopting an example of 2179 node system of the northeast practical power grid, and the method 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 achieve the set power target value. The test results verify the effectiveness of the present invention.
1. The section definition and target power settings are shown in tables 1 and 2
TABLE 1 DC section and target power
| DC section name | | Pole | 1 target power | Pole 2 target power |
| DC1009 | Bipolar operation | 1000MW | 600MW | |
| DC1002 | Monopolar operation | 300MW | 0MW |
TABLE 2 alternating current section and target power
| Alternating section name | Number of branches on cross section | Cross section |
| Section | ||
| 1 | 3 | 2500MW |
| Section 2 | 4 | 1200MW |
2. Single test data adjustment flow specification
1 group of test data is selected to describe the adjustment flow of the invention in detail. The current pole 1 power of the DC1009 of the DC section of the test data of the group is 1000MW, and the pole 2 power is 1000MW; DC section DC1002 currently has a pole 1 power of 500MW and a pole 2 power of 0MW. The current power of the alternating current section 1 is 1950.15MW and the current power of the alternating current section 2 is 1600.00MW.
Step 2, according to the knowledge < DC section adjustment state, the operation is performed, the DC section power adjustment is performed > → < the DC section power adjustment is performed, the operation is performed, the DC section power deviation amount is calculated > → < the DC section power adjustment is performed, the operation is performed, the DC section transmitting and receiving end adjustable generator set is searched > → < the DC section power adjustment is performed, the operation is performed, the output of the generator set is adjusted according to the output margin > → < the DC section power adjustment is performed, the operation is performed, and the generator active output is modified to adjust the generator active output. The adjustment scheme is shown in table 3:
TABLE 3 DC section adjustment scheme
| Adjusting generator names | State before adjustment | Adjusted state | Active force before adjustment | After adjustment active force |
| 426 | Operation | Operation | 600MW | 200MW |
| 365 | Operation | Operation | 800MW | 600MW |
| 382 | Shutdown of operation | Operation | 0MW | 300MW |
| 377 | Shutdown of operation | Operation | 0MW | 300MW |
And step 3, the regulated DC bus voltage is 1.0, and is within the limit value range. According to the knowledge < DC section adjustment state, there is an operation to perform DC voltage out-of-limit adjustment > → < perform DC voltage out-of-limit adjustment >, there is an operation to determine whether DC voltage is out-of-limit >, and then no DC voltage adjustment is performed.
And step 4, adjusting the active force of the balancing machine to 349.2MW, wherein the active force is within a limit value range. According to the knowledge < DC section adjustment state, there is an operation, the balance machine out-of-limit adjustment > → < DC voltage out-of-limit adjustment is performed, and if the balance machine active force out-of-limit is judged, the balance machine out-of-limit adjustment is not performed.
And step 5, recalculating the direct-current section power, wherein the direct-current section power reaches a target value, and finishing the direct-current section adjustment.
And step 6, according to the knowledge < alternating current section adjustment state, the method is characterized in that the difference value between the current power and the target power of the alternating current section is more than 20MW > and the alternating current section adjustment state is weighted and 1>, and the alternating current section adjustment state is entered.
And 7, according to the knowledge < AC section adjustment state, the operation is performed, the AC section power adjustment is performed > → < AC section power adjustment is performed, the operation is performed, the AC section power deviation amount is calculated > → < AC section power adjustment is performed, the operation is performed, the AC section power adjustment is performed by searching an AC section transmitting and receiving end adjustable generator set > → < AC section power adjustment is performed, the operation is performed, the output of the generator set is adjusted according to the output margin > → < AC section power adjustment is performed, and the generator active output is modified to adjust the generator active output. The adjustment scheme is shown in table 4:
table 4 ac section adjustment scheme
| Adjusting generator names | State before adjustment | Adjusted state | Active force before adjustment | After adjustment active force |
| 262 | Shutdown of operation | Operation | 0MW | 100MW |
| 220 | Shutdown of operation | Operation | 0MW | 300MW |
| 199 | Shutdown of operation | Operation | 0MW | 149.85MW |
| 329 | Operation | Operation | 360MW | 0MW |
| 330 | Operation | Operation | 600MW | 410.15MW |
And 8, recalculating the alternating current section power, wherein the alternating current section power reaches the target value, and the alternating current section adjustment is finished.
3. Test dataset adjustment effect analysis
In order to verify the effectiveness of the method and the adaptability of the method to different characteristic power grids, 4417 groups of test data of different section powers are generated to form a test data set by combining the switching conditions of a generator, a load and a capacitor reactor on the basis of initial power flow. The adjustment results are shown in table 5:
table 5 test dataset 1 adjustment results
| Adjusted state | Number of samples |
| All DC sections reach the target | 4417 |
| Part of the DC section reaches the target | 0 |
| All the DC sections do not reach the target | 0 |
| All alternating current sections reach the target | 4415 |
| Part of the alternating current section reaches the target | 0 |
| All alternating current sections do not reach the target | 0 |
| Adjusting non-convergence | 2 |
| Adjusting success rate | 99.95% |
In the embodiment 2 of the invention, in order to test the effectiveness and the adaptability of the method in a large-scale power grid, the method is verified by adopting a northwest practical power grid 14127 node system example. The profile definition and target power settings are shown in tables 6 and 7:
TABLE 6 DC section and target power
| DC section name | | Pole | 1 target power | Pole 2 target power |
| DC in the sky | Bipolar operation | 3500MW | 3500MW |
TABLE 7 alternating current section and target power
| Alternating section name | Number of branches on cross section | Cross section target power |
| Xinjiang delivery | 4 | 3800MW |
| Sweet Shaan | 4 | 5500MW |
And by combining the switching conditions of the generator, the load and the capacitor reactor on the basis of the initial power flow, 1332 sets of test data of different section powers are generated. The adjustment results are shown in table 8:
table 8 test dataset 2 adjustment results
| Adjusted state | Number of samples |
| All DC sections reach the target | 1332 |
| Part of the DC section reaches the target | 0 |
| All the DC sections do not reach the target | 0 |
| All alternating current sections reach the target | 1227 |
| Part of the alternating current section reaches the target | 0 |
| All alternating current sections do not reach the target | 0 |
| Adjusting non-convergence | 105 |
| Adjusting success rate | 92.12% |
The data of which the alternating current and direct current sections reach the target power after adjustment are 1127 groups, the adjustment success rate is 92.12%, and engineering and actual requirements are met. The intelligent adjustment time for averaging the test data in a group is 8.288 seconds, and compared with a manual adjustment method, the intelligent adjustment method has the advantages that the adjustment speed and efficiency are greatly improved, the manpower is saved, and the workload is reduced.
Fig. 3 is a schematic structural diagram of a large grid ac/dc multi-section power conditioning system 300 according to an embodiment of the present invention. As shown in fig. 3, a power adjustment system 300 for ac/dc multi-section of 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 power deviation amount calculating unit 301 calculates the power deviation amount based on the section type of the target section, the current power, and the target power, including:
when the section type is a direct current section, determining the power deviation amount by using the following method comprises the following steps:
when the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively;
and />
The current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively.
Preferably, the adjustable generator set determining unit 302 is configured to determine an adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold.
Preferably, the adjustable generator set determining unit 302 determines, when the absolute value of the power deviation is greater than a preset power deviation threshold, an adjustable generator set associated with the target section, including:
When the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; />
The upper limit of the active output of the generator set; />
Is the lower limit of the active output of the generator set. />
Preferably, the adjusting unit 303 is configured to determine an output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount, and adjust the output adjustment amount 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, and complete adjustment of the section power.
Preferably, the adjusting unit 303 determines an output adjustment amount of the adjustable generator set associated with the target section based on the power deviation amount, including:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
The current active power of the receiving-end generator set j;
when (when)
When the power transmission end reduces the power output, the power reception end increases the power output, and the power output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein , 
active power reduced for section terminal generator set i, +.>
Increase for section end-feeding generator set jActive power of (2); />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum 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 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 connected with any one alternating current section.
Preferably, wherein the system further comprises:
the first judgment result acquisition unit is used for judging whether the regulated direct current bus voltage is out of limit or not based on the upper limit value and the lower limit value of the preset direct current bus voltage when the section type of the target section is a direct current section, and acquiring a first judgment result;
the direct current bus voltage out-of-limit adjusting unit is used for adjusting reactive power compensation equipment associated with the direct current bus when the first judging result indicates that the direct current bus voltage is out-of-limit;
the second judgment result acquisition unit is used for judging whether the balance machine is out of limit or not based on a preset balance machine active force limit value, and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the generator output associated with the balancing machine when the second judging result indicates that the balancing machine output is out-of-limit.
Preferably, the dc bus voltage out-of-limit adjustment unit adjusts the reactive compensation device associated with the dc bus when the first determination result indicates that the dc bus voltage is out-of-limit, including:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
And 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
Preferably, the balancing machine output out-of-limit adjustment unit adjusts the generator output associated with the balancing machine when the second determination result indicates that the balancing machine output is out-of-limit, and includes:
if the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
The system 300 for adjusting ac/dc multi-section power of a large power grid according to the embodiment of the present invention corresponds to the method 100 for adjusting ac/dc multi-section power of a large power grid according to another embodiment of the present invention, and will not be described herein.
Based on another aspect of the present invention, the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of any one of the large grid ac/dc multi-profile power adjustment methods.
Based on another aspect of the present invention, the present invention provides an electronic device, including:
the computer readable storage medium as described above; and
one or more processors configured to execute the programs in the computer-readable storage medium.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by 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 therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, 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.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (12)
1. The method for adjusting the power of the alternating current and direct current multi-section of the large power grid is characterized by comprising the following steps of:
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;
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 so that the absolute value of the power deviation amount is smaller than a preset power deviation amount threshold value to complete adjustment of section power;
the calculating the power deviation amount based on the section type, the current power and the target power of the target section comprises the following steps:
when the section type is a direct current section, determining the power deviation amount by using the following method comprises the following steps:
when the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively; />
And
the current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively;
And determining an adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold, wherein the adjustable generator set comprises:
when the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; />
The upper limit of the active output of the generator set; />
The lower limit of the active output of the generator set;
wherein the determining, based on the power deviation amount, an output adjustment amount of an adjustable generator set associated with the target section includes:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; / >
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
The current active power of the receiving-end generator set j;
when (when)
At the time of sendingThe end decreasing force and the receiving end increasing force determine the output force adjustment quantity of the adjustable generator set associated with the target section by the following method, comprising:
wherein ,
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum active power of the receiving-end generator set j.
2. The method according to claim 1, wherein the method further comprises: before the calculation of 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 cross sections to be adjusted, selecting an adjustable generator set connected with any one alternating current cross section, and adjusting any one alternating current cross section based on the adjustable generator set connected with any one alternating current cross section.
3. The method according to claim 1, 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 upper limit value and the lower limit value of the preset direct current bus voltage, and acquiring a first judgment result;
when the first judging result indicates that the voltage of the direct current bus is over, reactive power compensation equipment associated with the direct current bus is adjusted;
judging whether the balance machine is out of limit or not based on a preset active force limit value of the balance machine, and acquiring a second judgment result;
and when the second judging result indicates that the output of the balancing machine is beyond, adjusting the output of the generator associated with the balancing machine.
4. A method according to claim 3, wherein adjusting the reactive compensation device associated with the dc bus when the first determination indicates that the dc bus voltage is over-time, comprises:
For any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
and 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
5. The method of claim 3, wherein adjusting the generator output associated with the balancing machine when the second determination indicates that the balancing machine output is over-time, comprises:
if the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
6. A large grid ac/dc multi-section power regulation system, the system comprising:
a power deviation amount calculation unit for calculating a power deviation amount based on a section type of the target section, the current power, and the target power;
an adjustable generator set determining unit, configured to determine an adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold;
the adjusting unit is used for determining the output force adjusting quantity of the adjustable generator set related to the target section based on the power deviation quantity and adjusting the output force adjusting quantity so that the absolute value of the power deviation quantity is smaller than a preset power deviation quantity threshold value to finish the adjustment of the section power;
the power deviation amount calculating unit calculates a power deviation amount based on a section type of a target section, a current power and a target power, and includes:
when the section type is a direct current section, determining the power deviation amount by using the following method comprises the following steps:
When the section type is an alternating current section, determining the power deviation amount by using the following method comprises the following steps:
wherein ,
is the amount of power deviation; />
and />
Target power of the direct current section and the alternating current section respectively; />
And
the current power of the direct current section and the alternating current section respectively; />
and />
The power of the electrode 1 and the power of the electrode 2 of the direct current section are respectively;
the adjustable generator set determining unit determines an adjustable generator set associated with the target section when the absolute value of the power deviation is greater than a preset power deviation threshold, and includes:
when the absolute value of the power deviation is larger than a preset power deviation threshold, respectively searching the connected generator sets from the section sending end bus and the receiving end bus according to the electric distance;
for any connected generator set, if the any connected generator set meets the preset constraint, 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; />
Active output of the generator set; />
The upper limit of the active output of the generator set; />
The lower limit of the active output of the generator set;
Wherein the adjusting unit determines an output adjustment amount of an adjustable generator set associated with the target section based on the power deviation amount, comprising:
when (when)
When the output end increases the output force, the output end decreases the output force, and the output force adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
is the amount of power deviation; />
A preset power deviation amount threshold value; />
、/>
The power adjusted by the section transmitting end and the receiving end respectively; />
、/>
The number of the adjustable generator sets which are respectively the section sending end and the section receiving end and participate in adjustment; />
Generating set for transmitting end of section>
Increased active power, +.>
Active power reduced for the section receiving end generator set j; />
For sending end generator set->
Start-stop sign of->
A start-stop sign of the receiving-end generator set j; />
For the maximum value of the active power of the power generating set i at the power supply end,/->
The active power minimum value of the receiving end generator set j; />
For the current active power of the power-on generator set i, < > for>
The current active power of the receiving-end generator set j;
when (when)
When the power transmission end reduces the power output, the power reception end increases the power output, and the power output adjustment quantity of the adjustable generator set associated with the target section is determined by the following method, which comprises the following steps:
wherein ,
active power reduced for section terminal generator set i, +.>
Active power added for the section transmitting end generator set j; />
For the minimum value of the active power of the power generating set i at the power transmitting end,/-, is given by>
The maximum active power of the receiving-end generator set j.
7. The system of claim 6, 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 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 connected with any one alternating current section.
8. The system of claim 6, wherein the system further comprises:
the first judgment result acquisition unit is used for judging whether the regulated direct current bus voltage is out of limit or not based on the upper limit value and the lower limit value of the preset direct current bus voltage when the section type of the target section is a direct current section, and acquiring a first judgment result;
the direct current bus voltage out-of-limit adjusting unit is used for adjusting reactive power compensation equipment associated with the direct current bus when the first judging result indicates that the direct current bus voltage is out-of-limit;
The second judgment result acquisition unit is used for judging whether the balance machine is out of limit or not based on a preset balance machine active force limit value, and acquiring a second judgment result;
and the balancing machine output out-of-limit adjusting unit is used for adjusting the generator output associated with the balancing machine when the second judging result indicates that the balancing machine output is out-of-limit.
9. The system according to claim 8, wherein the dc bus voltage out-of-limit adjustment unit adjusts the reactive compensation device associated with the dc bus when the first determination result indicates that the dc bus voltage is out-of-limit, comprising:
for any pole, if the second judgment result indicates that the voltage of the direct current bus is larger than the upper limit of the preset direct current bus voltage, a parallel capacitor connected with an internal branch of the first preset series of the direct current bus of any stage is withdrawn, and a parallel reactor connected with the internal branch of the first preset series of the direct current bus of any stage is put into;
and 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 voltage of the preset direct current bus, the parallel reactor connected with the branch circuit of which the direct current bus of any stage has the first preset series is withdrawn, and the parallel capacitor connected with the branch circuit of which the direct current bus of any stage has the first preset series is put into.
10. The system of claim 8, wherein the balancing machine output limit override unit, when the second determination indicates that the balancing machine output limit is exceeded, adjusts a generator output associated with the balancing machine, comprising:
if the first judgment result indicates that the output of the balancing machine is larger than the upper limit of the active output of the preset balancing machine, putting into a generator set in an off-operation state connected with a branch circuit within a second preset level of the balancing machine, or increasing the output of the generator set in an operation state connected with the branch circuit within the second preset level of the balancing machine;
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 an operating state, which is connected with the branch circuit within the second preset series of the balancing machine.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-5.
12. An electronic device, comprising:
the computer readable storage medium recited in claim 11; and
One or more processors configured to execute the programs in the computer-readable storage medium.
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