CN112598299B - Combined power supply grid pattern construction method for 750 kilovolt power supply area of load center - Google Patents
Combined power supply grid pattern construction method for 750 kilovolt power supply area of load center Download PDFInfo
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Abstract
A method for constructing a combined power supply grid pattern of a 750 kilovolt power supply area of a load center comprises the steps of constructing a power supply index system of the power supply area; judging whether the combined power supply benefit exists or not according to whether the power supply index system meets the combined power supply benefit threshold of the power supply area or not; selecting a combined power supply area structure mode based on the main transformer scale of the transformer substation; and carrying out comprehensive evaluation on two constraints, namely power transmission capacity constraint and short-circuit current constraint, of the planned combined power supply area: when the two constraints reach standards at the same time, the structure mode of the currently selected combined power supply area is established, and the combined power supply area is successfully constructed; and when one or two of the two indexes are not satisfied, optimizing the target net rack, and finally constructing the combined power supply area satisfying the constraint. The invention forms a proper combined power supply area, thereby effectively improving the power supply reliability of the main grid frame of the load center and the utilization efficiency of the 750 kilovolt transformer substation.
Description
Technical Field
The invention belongs to the field of power grid planning, and particularly relates to a method for constructing a combined power supply grid pattern of a 750 kilovolt power supply area of a load center.
Background
Grid planning is an important component of service power planning and socioeconomic development planning. With the continuous development of the economic society in China, the ultra-high voltage power grid of the load center has formed a larger scale; the load central station sites and corridor resources are increasingly tense, the power grid construction difficulty is increasingly high, and the power grid construction cost is increasingly high; the likelihood of the load center building a supportive conventional power supply is continually decreasing. Under the background, in order to exert the utilization efficiency of the ultra-high voltage power grid to the maximum extent, the economy of power grid construction is improved, the power supply reliability of the main network is improved, the risk of large-area power failure is reduced, the requirements of life and economic and social development of people on power are met, and the mode method and key technology for researching the combined power supply of the load center power grid have important theoretical significance and practical significance in combination with the current situation of the power grid and power grid planning.
At present, a 750 kilovolt power supply area in an ultra-high voltage power grid is powered by an independent operation mode, after a lower 330 kilovolt power grid forms a ring network structure, a single 750 kilovolt transformer substation is used as an upper power supply point to form an independent power supply area, the power supply area and a peripheral 750 kilovolt transformer substation are in ring-opening operation, an electric path is not formed between the two 750 kilovolt power supply areas through the 330 kilovolt power grid, a combined power supply area cannot be built, and the power supply reliability of a load center main grid frame and the utilization efficiency of the 750 kilovolt transformer substation are not high.
Disclosure of Invention
The invention aims to solve the problem that a 750 KV power supply area of a load center cannot supply power jointly in the prior art, and provides a method for constructing a 750 KV power supply area combined power supply grid mode of the load center.
In order to achieve the above purpose, the present invention has the following technical scheme:
a method for constructing a combined power supply grid pattern of a 750 kilovolt power supply area of a load center comprises the following steps:
s1, constructing a power supply index system of a power supply area;
s2, judging whether the combined power supply benefit exists according to whether the power supply index system meets the combined power supply benefit threshold of the power supply area;
s3, selecting a combined power supply area structure mode based on the main transformer scale of the transformer substation;
s4, carrying out comprehensive evaluation on two constraints, namely power transmission capacity constraint and short-circuit current constraint, of the planned combined power supply area: when the two constraints reach standards at the same time, the structure mode of the currently selected combined power supply area is established, and the combined power supply area is successfully constructed; and when one or two of the two indexes are not satisfied, optimizing the target net rack, and finally constructing the combined power supply area satisfying the constraint.
Preferably, the step S1 takes 2-3 target ultra-high voltage power grid 750 kilovolt power supply areas as objects, and takes the transformer substation with the highest voltage level as a mark of the power supply area; the power supply index system of the power supply area is constructed by taking the installed number and single capacity of the main transformer with the highest voltage level, the 330 kilovolt side short-circuit current level of the 750 kilovolt transformer substation, the power-off section capacity of the main transformer, the main power transmission section capacity in the power supply area and the power receiving requirement in the main section as constraint indexes.
Preferably, in the step S2, when the index system in the single power supply area satisfies any one of the following formulas, it is determined that the power supply area has the benefit of combined power supply:
1)(aS-bL+c(N-1)＜0；
2)M 1 -c(N-1)＜0；
3)M 2 -M 3 ＜0；
wherein a is a power supply output coefficient, b is a load coefficient, and c is a main transformer power factor;
s is a power supply installation machine in a power supply area, and the unit is: MW; l is the load, unit: MW; n is the highest voltage, etcThe number of the stage main transformers; m is M 1 The main transformer is the capability of getting off the net section, unit: MW; m is M 2 The power supply area is mainly provided with power transmission section capacity in units: MW; m is M 3 The unit is the power receiving requirement in the main section: MW.
Preferably, step S3 is performed by taking 750 kv power supply areas of 2-3 target ultra-high voltage power grids as targets, constructing 330 kv connection sections of the power supply areas according to the current net rack of 330 kv in the power supply areas, forming power mutual compensation between the power supply areas, and constructing a combined power supply area.
Preferably, the combined power supply area structure mode in step S3 includes the following three modes:
structure 1: when 2 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has no more than 2 main transformers, and the 750 kilovolt substation B has no more than 3 main transformers, the 750 kilovolt substation A and the 750 kilovolt substation B form a combined power supply area, and the middle part of the 750 kilovolt substation A and the 750 kilovolt substation B are connected through a 330 kilovolt line;
structure 2: when 2 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has 3 main transformers and the 750 kilovolt substation B has 2 main transformers, one main transformer of the 750 kilovolt substation A and 2 main transformers of the 750 kilovolt substation B form a combined power supply area, the middle is connected through a 330 kilovolt line, and the other two main transformers of the 750 kilovolt substation A form an independent power supply area of 750 kilovolts;
structure 3: when 3 750 kv substations form a combined power supply area, wherein, 750 kv substation a has 3 or 4 main transformers, 750 kv substation B has 2 main transformers, 750 kv substation C has two 2 main transformers, then 750 kv substation a is used as an intermediate contact point, 330 kv bus is split to operate, two main transformers and two main transformers of 750 kv substation B form a combined operation power supply area, and the other two or one main transformer and two main transformers of 750 kv substation C form a combined operation power supply area, and the combined operation power supply areas are connected through 330 kv lines.
Preferably, step S3 constructs a 330 kv connection section of the power supply area by two routes: firstly, a plurality of corresponding 330 kilovolt lines are selected to form 330 kilovolt connection sections together, secondly, a certain intermediate transformer substation is used as a junction point of a junction, and 330 kilovolt net racks on two sides of the junction transformer substation respectively form a ring network structure.
Preferably, the power transmission capacity constraint is the mutual power capacity meeting 750 kilovolt power supply interval, and the 330 kilovolt power grid between the 750 kilovolt substations which are jointly powered has the power exchange capacity, so that the comprehensive power supply efficiency is improved, the power exchange requirement under normal conditions is met, and the safe and reliable power supply after the main transformer N-1 of any 750 kilovolt power substation is met.
Preferably, the power transmission capability constraint specifically includes the following two types:
1a) When only 1 main transformer on the side A of the transformer substation exits from operation, the maximum power transmission capacity of the power supply of the connection section can completely meet the load power supply requirement L of the side A A ；
2a) When the 1 main transformer on the side A of the transformer substation exits from running, the maximum power transmission capacity of the power supply of the contact section can meet the load power supply requirement L of the side A A- And L is A- The power supply capacity of the main transformer at the side A is not more than that of the main transformer at the side A.
Preferably, the short-circuit current constraint condition is:
when the short-circuit current at the 330 kilovolt side of the 750 kilovolt transformer substation exceeds 63kA, the method of adding a small neutral reactance and simplifying the 330 kilovolt outgoing line of the 750 kilovolt transformer substation can be adopted for limiting, and if the short-circuit current after measures are still more than 63kA, the 750 kilovolt transformer substation does not have a combined power supply condition;
when the short-circuit current of a certain 330 kilovolt transformer substation in two 750 kilovolt power supply intervals exceeds the switch interruption capacity, the short-circuit current level is reduced by adopting a mode of replacing the switch and adjusting the grid structure, and if the short-circuit current after taking measures still exceeds the switch interruption capacity, the relevant 750 kilovolt transformer substation does not have the combined power supply condition.
Compared with the prior art, the invention has the following beneficial effects: by constructing a power supply index system of the power supply area, when the power supply capacity of the 750 kilovolt power supply area for independent power supply meets a threshold value, the power supply system has the combined power supply benefit, namely has the potential of improving the power supply capacity of the existing 750 kilovolt transformer substation and 330 kilovolt grid through constructing the combined power supply area. The invention selects the structure mode of the combined power supply area based on the main transformer scale of the transformer substation, and can adapt to flexible combination among 750 kilovolt power supply areas with different scales. The construction method can evaluate the feasibility of the construction scheme of the 750 kilovolt combined power supply area after evaluating the two dimensions of the power transmission capacity constraint and the short-circuit current level constraint of the 330 kilovolt grid, and finally construct the 330 kilovolt grid between the 750 kilovolt power supply areas. The invention can evaluate the feasibility of the combined power supply of the power supply area according to the current power grid structure, and accurately construct a proper combined power supply area, thereby effectively improving the power supply reliability of the main grid frame of the load center and the utilization efficiency of the 750 kilovolt transformer substation.
Drawings
FIG. 1 is a schematic diagram of a typical structure of combined operation of two 750 KV transformer substations, namely '2+2' or '2+3';
FIG. 2 is a schematic diagram of a typical structure of combined operation of two substations of 2+1+2;
FIG. 3 is a schematic diagram of a typical structure of a combined operation of a '2+1' + '2+2' three 750 KV substation;
FIG. 4 is a schematic diagram of a combined power supply area 1 side main transformer with a 2+1 structure after exiting operation;
FIG. 5 is a schematic diagram of a main transformer at the side of the combined power supply area 1 with a 2+3 or 2+2 structure after the main transformer exits from operation;
fig. 6 is a schematic cross-sectional view of a connection of a plurality of 330 kv lines;
fig. 7 is a schematic diagram of a 330 kv grid structure of a substation as a junction point of a junction.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
A construction method of a combined power supply grid pattern of a 750 kilovolt power supply area of a load center comprises the following steps:
1. establishing a combined power supply index system of a power supply area;
1) And taking 2-3 target ultra-high voltage power grid 750 kilovolt power supply areas as objects, and taking the transformer substation with the highest voltage level as a mark of the power supply area.
2) With the power supply installation S (unit: MW), load L (unit:MW), the number of main transformers N of the highest voltage class, and the single capacity V (unit: MVA), 330 kv side short-circuit current level I of 750 kv substation (unit: kA), main transformer off-grid section capacity M 1 (unit: MW), main power transmission section capacity M in power supply region 2 (unit: MW), main section power receiving requirement M 3 (unit: MW) is used as constraint index, and a research and judgment index system is constructed.
2. Establishing a combined power supply benefit threshold value of a power supply area;
when the index system in the single power supply area meets any one of the following formulas, the power supply area has the benefit of combined power supply, and the effective load supply capacity of a 750 kilovolt transformer substation in the area can be effectively improved on the premise that the 750 kilovolt distribution point is not newly increased by constructing the combined power supply area, the power supply capacity of a 330 kilovolt power transmission line is improved, and land resources of a load center are saved:
1)(aS-bL+c(N-1)＜0，
2)M 1 -c(N-1)＜0，
3)M 2 -M 3 ＜0，
wherein a is a power supply output coefficient, b is a load coefficient, and c is a main transformer power factor.
3. Selecting a typical power supply structure mode of a combined power supply area, as shown in fig. 1, 2 and 3;
three typical combined power supply structures are provided for 2 or 3 750 kilovolt substations to form a combined power supply area.
Structure 1: when 2 750 kv substations form a combined power supply area, wherein the 750 kv substation a has no more than 2 main transformers, and the 750 kv substation B has no more than 3 main transformers. The 750 kilovolt transformer substation A and the 750 kilovolt transformer substation B form a power supply area which operates in a combined mode, and the power supply area are connected through 330 kilovolt lines, namely the power supply area is of a 2+3 or 2+2 structure.
Structure 2: when 2 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has 3 main transformers and the 750 kilovolt substation B has 2 main transformers. One main transformer of the 750 kilovolt transformer substation A and 2 main transformers of the 750 kilovolt transformer substation B form a power supply area which operates in a combined mode, and the two main transformers are connected through a 330 kilovolt line; the other two main transformers of the 750 KV transformer substation A form an independently operated 750 KV power supply area, namely a '2+1+2' structure.
Structure 3: when 3 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has 3 or 4 main transformers, the 750 kilovolt substation B has 2 main transformers, and the 750 kilovolt substation C has two 2 main transformers. The 750 kilovolt transformer substation A is used as an intermediate contact point, 330 kilovolt buses of the 750 kilovolt transformer substation A are split to operate, two main transformers and two main transformers of the 750 kilovolt transformer substation B form a combined operation power supply area, the other two main transformers or one main transformer and the two main transformers of the 750 kilovolt transformer substation C form a combined operation power supply area, and the combined operation power supply areas are connected through 330 kilovolt lines, namely '2+1' + '2+2' or '2+2' + '2+2'.
4. Constructing a net rack of the combined power supply area;
the 750 KV transformer substation in the load center has the advantage of adopting combined power supply, and the power supply reliability and the main transformer utilization efficiency are improved. Based on the scale of the target 750 KV independent power supply area, one structure is selected from the three typical combined power supply structures described in the previous section, and a combined power supply area is constructed, wherein the combined power supply area needs to meet the double constraint of the transmission capacity of a 330 KV power transmission section and short-circuit current.
A. Construction of a 330 kilovolt contact section: the 330 KV connecting section of the combined power supply area can be divided into two structural forms according to section composition, wherein a plurality of 330 KV connecting sections are formed by taking a plurality of 330 KV lines as a base layer; the other is to use a certain intermediate transformer substation as a junction point of a junction, and a 330 kilovolt bus is used as a carrier for tide crossing.
(1) A plurality of 330 kv lines together form a 330 kv link section, as shown in fig. 6;
(2) A certain intermediate transformer substation is used as a junction point of a junction, and 330 kilovolt net racks at two sides of the junction transformer substation respectively form a ring network structure, as shown in fig. 7;
and determining a specific target grid structure of the connection section according to the existing 330 kilovolt main grid structure, load level and distribution, power distribution, short-circuit current and other factors.
B. Carrying out constraint evaluation on transmission capacity of a 330 kilovolt transmission section;
in order to meet the mutual-aid capability of 750 kilovolt power supply intervals, a 330 kilovolt power grid between 750 kilovolt substations which jointly supply power must have certain power exchange capability, and the power exchange requirement under normal conditions is met while the comprehensive power supply efficiency is improved, and the safe and reliable power supply after the main transformer N-1 of any 750 kilovolt transformer station is met. In particular, two cases.
(1) Referring to FIG. 4, for the combined power supply region of the "2+1" structure, first, the section power transmission capability C is connected T (stability limit) should be greater than the tie-section tidal current crossing requirement L T The method comprises the steps of carrying out a first treatment on the surface of the When only 1 main transformer on the side A of the transformer substation exits from operation, the maximum power transmission capacity (thermal stability limit) C of the power supply of the connection section max Should be able to meet the full load power supply requirement L on the A side A (L A ＝L A1 +L A2 +……+L An ) C, i.e max ≥L A 。
(2) Referring to FIG. 5, for the combined power supply region of the "2+3" or "2+2" structure, first, the section power transmission capability C is connected T (stability limit) should be greater than the tie-section tidal current crossing requirement L T The method comprises the steps of carrying out a first treatment on the surface of the When 1 main transformer on the side A of the transformer substation exits from running, the connection section supplies power with the maximum power transmission capacity (thermal stability limit) C max Should be able to meet the a-side load power supply requirement L A- (L A- ＝L A1 +L A2 +……+L An -G A ) C, i.e max ≥L A- And L is A- The power supply capacity of the main transformer at the side A is not more than that of the main transformer at the side A.
C. Carrying out short-circuit current constraint evaluation;
the reliability of the combined power supply is high, but as the load grows, the power grid structure is dense, and the problem of overhigh short-circuit current can occur.
When the short-circuit current at the 330 kilovolt side of the 750 kilovolt transformer substation exceeds 63kA, the method of adding a small neutral reactance and simplifying the 330 kilovolt outgoing line of the 750 kilovolt transformer substation can be adopted for limiting. If the short-circuit current I is taken after measures are taken S Still exceeding 63kA, the 750 kv substation does not have joint power supply conditions.
Some 330 kv of the two 750 kv power supply intervalsWhen the short-circuit current of the transformer substation exceeds the interruption capacity of the switch, the short-circuit current level of the transformer substation needs to be reduced by adopting a mode of replacing the switch and adjusting the grid structure, and if the short-circuit current I after measures are taken P Still exceeds the switch interruption capacity I L The relevant 750 kv substation does not have the joint power supply condition.
In summary, the short-circuit current constraint conditions are:
I S ∨I P ＜63，I P ＜I L
when the short-circuit current level of the 750 kilovolt transformer substation and the 330 kilovolt transformer substation in the power supply area meets the constraint, the 750 kilovolt power supply area has the condition of combined power supply.
D. Establishing a combined power supply area;
and constructing a combined power supply area according to the selected typical structure, and carrying out 330 kilovolt power transmission capacity and short circuit current constraint evaluation on the combined power supply area. If the combined power supply area can not meet the constraint at the same time, the 330 kilovolt connection section is optimally adjusted to form a closed loop feedback flow, and the optimization is continuously carried out. Until 2 constraints of the 330 kilovolt transmission section and the short-circuit current are met at the same time.
Examples
The invention discloses a construction method of a combined power supply grid pattern of a 750 kilovolt power supply area of a load center, which comprises the following steps:
1) And constructing an index system based on the main transformer capacity, the number of main transformers, the power transmission capacity of a 330 kilovolt lower network section, the load demand and the parameters of a power installation in a power supply area, evaluating an independent power supply area of 750 kilovolts, and evaluating whether the independent power supply area has the combined power supply necessity and benefit.
2) And aiming at a target 750 kilovolt power supply area with combined power supply requirements and benefits, evaluating the main transformer scale and 330 kilovolt grid structure of the target 750 kilovolt power supply area and the peripheral 750 kilovolt power supply area, and selecting a structural mode matched with the main transformer scale and 330 kilovolt grid structure in three typical combined power supply structures.
3) According to the characteristic of the existing 330 KV grid structure in the junction area, corresponding 330 KV lines are selected to jointly form 330 KV junction sections, and a certain intermediate transformer substation is used as a junction point, wherein 330 KV grid structures on two sides of the junction transformer substation respectively form a ring network structure.
4) And evaluating the combined power supply area to be built based on two constraint conditions of the 330 kilovolt connection section power transmission capacity constraint and the short circuit power level constraint.
5) If the double constraint is met, the 750 kilovolt combined power supply area is successfully constructed. If some or all constraint conditions are not met, continuously optimizing a 330 kilovolt connection section construction mode and optimizing and adjusting a local 330 kilovolt grid structure mode according to the selected combined power supply typical structure mode until double constraints of power transmission section capacity and short circuit power level are met. A 750 kv combined power supply region was constructed.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (5)
1. A method for constructing a combined power supply grid pattern of a 750 kilovolt power supply area of a load center is characterized by comprising the following steps:
s1, constructing a power supply index system of a power supply area;
s2, judging whether the combined power supply benefit exists according to whether the power supply index system meets the combined power supply benefit threshold of the power supply area;
s3, selecting a combined power supply area structure mode based on the main transformer scale of the transformer substation;
s4, carrying out comprehensive evaluation on two constraints, namely power transmission capacity constraint and short-circuit current constraint, of the planned combined power supply area: when the two constraints reach standards at the same time, the structure mode of the currently selected combined power supply area is established, and the combined power supply area is successfully constructed; when one or two of the two indexes are not satisfied, optimizing the target net rack, and finally constructing a combined power supply area satisfying the constraint;
step S1 is to take 2-3 target ultra-high voltage power grid 750 kilovolt power supply areas as objects, and take the transformer substation with the highest voltage level as a mark of the power supply area; constructing a power supply index system of a power supply area by taking a power supply installation machine, a load, the number and single capacity of main transformers with the highest voltage level in the power supply area, a 330 kilovolt side short-circuit current level of a 750 kilovolt transformer substation, a main transformer off-grid section capacity, a main power transmission section capacity in the power supply area and a power receiving requirement in the main section as constraint indexes;
step S2 judges that the power supply area has the benefit of combined power supply when the index system in the single power supply area meets any one of the following formulas:
1)(aS-bL+c(N-1)＜0；
2)M 1 -c(N-1)＜0；
3)M 2 -M 3 ＜0；
wherein a is a power supply output coefficient, b is a load coefficient, and c is a main transformer power factor;
s is a power supply installation machine in a power supply area, and the unit is: MW; l is the load, unit: MW; n is the number of main transformers with the highest voltage level; m is M 1 The main transformer is the capability of getting off the net section, unit: MW; m is M 2 The power supply area is mainly provided with power transmission section capacity in units: MW; m is M 3 The unit is the power receiving requirement in the main section: MW;
step S3 is to take 750 kilovolt power supply areas of 2-3 target ultra-high voltage power grids as objects, and according to the current net rack of 330 kilovolts in the power supply areas, constructing 330 kilovolt connection sections of the power supply areas, forming power mutual compensation between the power supply areas, and constructing a combined power supply area;
the combined power supply area structure mode described in step S3 includes the following three modes:
structure 1: when 2 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has no more than 2 main transformers, and the 750 kilovolt substation B has no more than 3 main transformers, the 750 kilovolt substation A and the 750 kilovolt substation B form a combined power supply area, and the middle part of the 750 kilovolt substation A and the 750 kilovolt substation B are connected through a 330 kilovolt line;
structure 2: when 2 750 kilovolt substations form a combined power supply area, wherein the 750 kilovolt substation A has 3 main transformers and the 750 kilovolt substation B has 2 main transformers, one main transformer of the 750 kilovolt substation A and 2 main transformers of the 750 kilovolt substation B form a combined power supply area, the middle is connected through a 330 kilovolt line, and the other two main transformers of the 750 kilovolt substation A form an independent power supply area of 750 kilovolts;
structure 3: when 3 750 kv substations form a combined power supply area, wherein, 750 kv substation a has 3 or 4 main transformers, 750 kv substation B has 2 main transformers, 750 kv substation C has two 2 main transformers, then 750 kv substation a is used as an intermediate contact point, 330 kv bus is split to operate, two main transformers and two main transformers of 750 kv substation B form a combined operation power supply area, and the other two or one main transformer and two main transformers of 750 kv substation C form a combined operation power supply area, and the combined operation power supply areas are connected through 330 kv lines.
2. The method for constructing a combined power supply grid pattern for a 750 kv power supply area of a load center according to claim 1, wherein the step S3 constructs a 330 kv connection section of the power supply area by two ways: firstly, a plurality of corresponding 330 kilovolt lines are selected to form 330 kilovolt connection sections together, secondly, a certain intermediate transformer substation is used as a junction point of a junction, and 330 kilovolt net racks on two sides of the junction transformer substation respectively form a ring network structure.
3. The method for constructing the combined power supply grid pattern of the 750 kilovolt power supply area of the load center according to claim 1, wherein the power transmission capacity constraint is that the mutual power capacity of the 750 kilovolt power supply area is met, the power exchange capacity of a 330 kilovolt power grid between the 750 kilovolt power substations which are combined to supply power is achieved, the comprehensive power supply efficiency is improved, meanwhile, the power exchange requirement under normal conditions is met, and the safe and reliable power supply after the main transformer N-1 of any 750 kilovolt power substation is met.
4. The method for constructing a combined power grid pattern for 750 kv power supply area of load center according to claim 3, wherein the power transmission capacity constraint specifically comprises the following two types:
1a) When only 1 main transformer on the side A of the transformer substation exits from operation, the maximum power transmission capacity of the power supply of the connection section can completely meet the load power supply requirement L of the side A A ；
2a) When the 1 main transformer on the side A of the transformer substation exits from running, the maximum power transmission capacity of the power supply of the contact section can meet the load power supply requirement L of the side A A- And L is A- The power supply capacity of the main transformer at the side A is not more than that of the main transformer at the side A.
5. The method for constructing the combined power supply grid pattern for the 750 kilovolt power supply area of the load center according to claim 1, wherein the short-circuit current constraint condition is as follows:
when the short-circuit current at the 330 kilovolt side of the 750 kilovolt transformer substation exceeds 63kA, the method of adding a small neutral reactance and simplifying the 330 kilovolt outgoing line of the 750 kilovolt transformer substation can be adopted for limiting, and if the short-circuit current after measures are still more than 63kA, the 750 kilovolt transformer substation does not have a combined power supply condition;
when the short-circuit current of a certain 330 kilovolt transformer substation in two 750 kilovolt power supply intervals exceeds the switch interruption capacity, the short-circuit current level is reduced by adopting a mode of replacing the switch and adjusting the grid structure, and if the short-circuit current after taking measures still exceeds the switch interruption capacity, the relevant 750 kilovolt transformer substation does not have the combined power supply condition.
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