CN110417004B - Extra-high voltage alternating current-direct current sending end power grid multi-source coordination peak shaving potential calculation model - Google Patents
Extra-high voltage alternating current-direct current sending end power grid multi-source coordination peak shaving potential calculation model Download PDFInfo
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- 230000033228 biological regulation Effects 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 3
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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
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a multi-source coordination peak regulation potential calculation model for an extra-high voltage alternating current-direct current transmission end power grid, and belongs to the technical field of dispatching and operation of alternating current-direct current power systems. The method comprises the following steps: calculating the peak regulation potential of the direct-current matching power supply; calculating the peak regulation potential of the multi-source coordinated power supply; calculating the peak regulation potential of the deeply transformed power supply; calculating the load side peak regulation potential; after the peak-shaving potentials are accumulated, the standby capacity is calculated again, and the peak-shaving potential of the system is calculated; the down peak potential of the system was calculated. The invention provides guidance for an actual running alternating current and direct current power system.
Description
Technical Field
The invention belongs to the technical field of extra-high voltage alternating current and direct current power system dispatching operation, and particularly relates to a multi-source coordination peak regulation potential calculation model for an extra-high voltage alternating current and direct current sending end power grid.
Background
The demand of an extra-high voltage alternating current and direct current transmission end power grid on the peak regulation capacity is increased suddenly, and the demand mainly has two reasons: firstly, a part of spare capacity of a system is occupied because a long-distance extra-high voltage direct current line needs to be supplied with power by a relatively stable power curve; and secondly, when the direct current is locked and the power supply is interrupted, the power difference needs to be quickly filled by other forms of power supplies so as to ensure the stable operation of the system, and the peak regulation pressure is increased. Meanwhile, the new energy grid connection has the characteristic of incomplete controllability, and peak load regulation pressure is further aggravated. Therefore, how to mine the peak shaving potential of the system is significant.
At present, no peak regulation potential analysis method for an extra-high voltage alternating current-direct current transmission end power grid exists, multi-source mining is needed, and a peak regulation potential calculation model is established.
Content of patent
The invention aims to simultaneously consider the power supply side and the load side, excavate and calculate the peak shaving potential of the system and provide support for scheduling operation.
In order to achieve the purpose, the invention provides a multi-source coordination peak regulation potential calculation model of an extra-high voltage alternating current-direct current transmission end power grid, which is characterized by comprising the following steps:
step 1: calculating the peak regulation potential of the direct-current matching power supply according to the regulation range of the direct-current matching power supply;
step 2: calculating the peak shaving potential of the multi-source coordination power supply according to the running state of the coordination power supply;
and step 3: calculating the peak regulation potential of the deeply-modified power supply according to the number and the depth of the modified power supplies;
and 4, step 4: after classifying the loads, calculating the load side peak regulation potential;
and 5: calculating the system standby capacity and calculating the peak load regulation potential of the system;
step 6: calculating the system standby capacity and calculating the peak reduction potential of the system;
further, the step 1 of calculating the power supply peak regulation potential for deep reconstruction specifically comprises:
step 11: the number N and the output magnitude G of the direct current matching power supply are counted i And starting mode K i Counting the regulation range of the DC matching power supply [ G ] imin ,G imax ]，
Step 12: computational peak shaver potential FG up And Down-Peak potential FG down ，
Further, the step 2 of calculating the peak shaving potential of the multi-source coordinated power supply specifically comprises:
step 21: counting the number M of the coordinated power supplies and the running state H of the coordinated power supplies i Counting the operating state range of the coordinated power supply [ H ] imin ,H imax ]，
Step 22: calculating the Peak Up potential FH of a coordinated Power supply up And Down-Peak potential FH down ，
Further, the step 3 of calculating the power supply peak regulation potential for deep reconstruction specifically comprises:
step 31: counting the number T of the deeply-improved power supplies and counting the technical output lower limit value H before and after the deep improvement of the power supplies imin And H' imin ，
Step 32: calculating peak reduction potential FA of deeply-transformed power supply down ，
Deep peak regulation transformation specially means that the minimum output of a unit is reduced, so that only the peak regulation potential exists.
Further, the step 4 of calculating the load side peak load regulation potential specifically includes:
step 41: and counting the number and the capacity of the loads with flexible controllable capacity. X, Y and Z represent the number of three types of loads of iron alloy, silicon carbide and aluminum; p XiN ，P YiN ，P ZiN Respectively representing rated capacity of the ith load in the three types of loads; p Xi ，P Yi ，P Zi Respectively representing the production planning capacity of the ith load in the three types of loads,
step 42: for the ferroalloy load, calculating the adjustable range according to the range of 100-120%; for the silicon carbide load, calculating an adjustable range according to the range of 80% -110%; the adjustable range is calculated according to the range of 90-100% for the electrolytic aluminum load,
step 43: calculating the Peak Up potential FL on the load side up And Down-Peak potential FL down ，
Further, the peak-up potential of the computing system in step 5 is specifically:
step 51: statistical system load capacity P L Determining the coefficient alpha%, then loading the reserve capacity P LB ＝α％·P L ，
Step 52: statistical DC transmission capacity P D Determining the coefficient beta%, then the DC spare capacity P DC ＝β％·P D ，
Step 53: after various peak regulation potentials are accumulated, the system standby capacity is calculated, and the peak regulation potential F of the system is calculated up ，
F up ＝FG up +FH up +FL up -P LB -P DC
Further, the down peak potential of the calculation system in step 6 is specifically:
after various peak regulation potentials are accumulated, the system standby capacity is calculated, and the peak regulation potential F of the system is calculated down ，
F down ＝FG down +FH down +FA down +FL down -P LB -P DC
The calculation model provided by the invention comprehensively considers the peak shaving spaces of various peak shaving power supplies and adjustable loads. By means of a multi-source coordination mode and a deep reconstruction mode, the peak regulation potential of the system is improved as much as possible, and stable operation of an extra-high voltage alternating current and direct current transmission end power grid is guaranteed.
Drawings
FIG. 1 is a flow chart of peak shaver potential calculation;
fig. 2 is a schematic diagram of a regional power grid.
Detailed Description
The preferred embodiments will be described in detail below with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Example 1
The invention provides a multi-source coordination peak regulation potential calculation model of an extra-high voltage alternating current-direct current transmission end power grid, which comprises the following steps:
step 1: computational peak shaver potential FG up And Down-Peak potential FG down The specific numerical values of (a) and (b) are shown in formulas (1) and (2), wherein N represents the total number of matched power supplies; k i And G i Respectively showing the starting mode and the active output of the ith station matching power supply, K i 1 represents starting up, 0 represents stopping; g imax And G imin Respectively representing the technical output upper and lower limit values of the ith matched power supply.
And 2, step: computing peak shaving potential FH up And Down Peak potential FH down Such as equations (3) and (4), where M represents the total number of coordinated power sources; h i The active output of the ith coordination power supply is represented; h imax And H imin Respectively representing the technical output upper and lower limit values of the ith station coordination power supply.
And step 3: calculation of Down-Peak-Regulation potential FA down The specific numerical value of (a), such as formula (5), wherein T represents the total number of power supplies that can be deeply retrofitted; h imin And H' imin Respectively representing the technical output lower limit values before and after the ith unit is deeply reformed.
And 4, step 4: computing peak shaver potential FL up And Down-Peak potential FL down Specific numerical values of (a) and (7), wherein X, Y, Z represent the number of the three types of loads of iron alloy, silicon carbide and aluminum; p XiN ，P YiN ，P ZiN Respectively representing rated capacity of the ith load in the three types of loads; p Xi ，P Yi ，P Zi Respectively representing the production planning capacity of the ith load in the three types of loads. Of particular note are: the power is adjusted upwards by the load, which is equivalent to the power is adjusted downwards by the power supply, and the peak reduction potential of the system is corresponded; conversely, a load down adjustment corresponds to a system peak shaving capability.
And 5: computing peak shaver potential F up Specific numerical values, such as formula (8):
F up ＝FG up +FH up +FL up -P LB -P DC (8)
wherein P is LB Indicating load reserve capacity, available system load P L α% of (a).
Step 6: calculation of Down-Peak potential F down Specific numerical values, such as formula (9):
F down ＝FG down +FH down +FA down +FL down -P LB -P DC (9)
wherein P is DC Indicating DC reserve capacity, preferably DC transmission capacity P D Beta% of (c).
A specific flow for calculating the peak shaver potential is shown in fig. 1.
Example 2
Fig. 2 is a schematic diagram of a regional power system including ac and dc, and taking this as an example, the model for calculating the multi-source coordination peak shaving potential of the extra-high voltage ac and dc transmission end power grid provided by the invention includes:
statistical calculation of peak shaver related data information, where P L ＝4600MW，P D 2000MW,% α ═ β ═ 10%, and the rest of the data are shown in table 1:
TABLE 1 summary of raw data required for peak shaving potential calculation
Step 1: FG is calculated according to equations (1) and (2) up ＝35MW，FG down ＝30MW。
Step 2: according to the formulas (3) and (4), FH is calculated up ＝60MW，FH down ＝30MW。
And step 3: calculating FA according to equation (5) down ＝70MW。
And 4, step 4: according to the formulas (6) and (7), FL is calculated up ＝40MW，FL down ＝34MW。
And 5: according to the formula (8), F is calculated up ＝69MW。
Step 6: according to the formula (9), F is calculated down ＝98MW。
The above example analysis shows that: the model can effectively calculate the peak regulation potential of the system, and the comparison shows that the peak regulation potential of the system is obviously increased by regulating the peak regulation capacity of the coordinated power supply and the load, so that guidance is provided for the power grid peak regulation scheduling of the AC/DC system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. A multi-source coordination peak regulation potential calculation method for an extra-high voltage alternating current-direct current transmission end power grid is characterized by comprising the following steps:
step 1: calculating the peak regulation potential of the direct-current matching power supply according to the regulation range of the direct-current matching power supply;
step 2: calculating the peak shaving potential of the multi-source coordination power supply according to the running state of the coordination power supply;
and step 3: calculating the peak regulation potential of the deeply-modified power supply according to the number and the depth of the modified power supplies;
and 4, step 4: classifying the load, and calculating the load side peak regulation potential after classification;
and 5: calculating the spare capacity of the system and the peak load regulation potential of the system;
step 6: calculating the spare capacity of the system and the peak reduction potential of the system;
the method for calculating the peak regulation potential of the direct-current matching power supply in the step 1 comprises the following steps:
step 11: counting the number N and the output G of the DC matching power supply i And starting mode K i Counting the regulation range of the DC matching power supply [ G ] imin ,G imax ]；
Step 12: computational peak shaver potential FG up And lowerPeak regulation potential FG down Wherein, in the step (A),
the method for calculating the peak shaving potential of the multi-source coordinated power supply in the step 2 comprises the following steps:
step 21: counting the number M of the coordinated power supplies and the running state H of the coordinated power supplies i Counting the operating state range of the coordinated power supply [ H ] imin ,H imax ]；
Step 22: calculating the Peak Up potential FH of a coordinated Power supply up And Down Peak potential FH down Wherein, in the step (A),
the method for calculating the power supply peak regulation potential for deep reconstruction in the step 3 comprises the following steps:
step 31: counting the number T of the deeply-improved power supplies and counting the technical output lower limit value H before and after the deep improvement of the power supplies imin And H' imin ；
Step 32: calculating peak reduction potential FA of deeply-transformed power supply down Wherein, in the step (A),
the method for calculating the load side peak regulation potential in the step 4 comprises the following steps:
step 41: counting the number and the capacity of loads with flexible controllable capacity;
step 42: for the ferroalloy load, calculating the adjustable range according to 100-120%; for the silicon carbide load, calculating an adjustable range according to 80-110%; for electrolytic aluminum loads, calculating the adjustable range according to 90-100%;
step 43: calculating the Peak Up potential FL on the load side up And Down-Peak potential FL down ，
X, Y, Z represents the number of three types of loads of ferroalloy, silicon carbide and aluminum respectively; p XiN 、P YiN 、P ZiN Respectively representing rated capacity of the ith load in the three types of loads; p Xi 、P Yi 、P Zi Respectively representing the production planning capacity of the ith load in the three types of loads;
the method for calculating the peak-up potential of the system in the step 5 comprises the following steps:
step 51: statistical system load capacity P L Determining the coefficient alpha%, then loading the reserve capacity P LB ＝α％·P L ；
Step 52: statistical DC transmission capacity P D Determining coefficient beta%, DC reserve capacity P DC ＝β％·P D ；
Step 53: after accumulating all peak-shaving potentials, calculating the spare capacity of the system and calculating the peak-shaving potential F of the system up Wherein, in the process,
F up ＝FG up +FH up +FL up -P LB -P DC ；
the method for calculating the peak reduction potential of the system in the step 6 comprises the following steps:
integrate the various tonesAfter the peak potential, calculating the spare capacity of the system and calculating the down-regulation peak potential F of the system down ，
F down ＝FG down +FH down +FA down +FL down -P LB -P DC 。
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