CN115395515B - Method and system for selecting guaranteed power supply in provincial bottom-protection power grid - Google Patents
Method and system for selecting guaranteed power supply in provincial bottom-protection power grid Download PDFInfo
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/0012—Contingency detection
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a method for selecting a guaranteed power supply in a provincial bottom-guaranteed power grid, which comprises the steps of obtaining data parameters of the power grid to be analyzed; obtaining a system power supply unit set and a corresponding power supply output line length set, and determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply output line length set; constructing a guaranteed power supply selection objective function and corresponding constraint conditions, and solving to obtain a guaranteed power supply selection set; and carrying out system inertia safety analysis by adopting an inertia time constant to finish the selection of a guaranteed power supply in the final provincial bottom-protecting power grid. The invention also discloses a system for realizing the selection method of the guaranteed power supply in the provincial bottom-protecting power grid. The invention can provide basis for constructing the high-proportion new energy power system bottom-protection power grid in extreme weather, ensures the safe and reliable power supply requirement of core users in extreme conditions, and has high reliability, better effect and higher efficiency.
Description
Technical Field
The invention belongs to the field of electric automation, and particularly relates to a method and a system for selecting a guaranteed power supply in a provincial bottom-protection power grid.
Background
Along with the development of economic technology and the improvement of living standard of people, electric energy becomes an indispensable secondary energy source in the production and living of people, and brings endless convenience to the production and living of people. Therefore, ensuring stable and reliable supply of electric energy becomes one of the most important tasks of the electric power system.
The bottom protection power grid is an extreme condition such as extreme weather, severe natural disasters and the like, aims to improve the power supply safety of urban core areas and important users and the quick recovery capacity under severe faults, and selects important sites, key circuits and disaster-resistant guarantee power supplies to conduct differential design construction, so that the formed minimum-scale grid is formed. That is, power can be supplied to core users through disaster-resistant safeguard power supplies and backbone network frames, as well as key communication channels and channels from which important power supplies are sent.
The guaranteed power supply can provide stable and reliable power support for the urban core area under extreme conditions such as extreme weather, severe natural disasters and the like. With the expansion of the scale of the power system and the increase of the power supply types, how to select a guaranteed power supply becomes one of important research targets of the power system.
At present, the selection of the power system guarantee power supply still adopts a simulation selection mode, namely, the power grid simulation, simulation and calculation under a special state are performed through power system simulation software, so that the guarantee power supply is selected. However, this method is time-consuming and laborious, and the selected process cannot be supported by theoretical and scientific analysis, so that the reliability is not high.
Disclosure of Invention
The invention aims to provide a method for selecting a guaranteed power supply in a provincial bottom-guaranteed power grid, which has high reliability, good effect and high efficiency.
The second purpose of the invention is to provide a system for realizing the selection method of the guaranteed power supply in the provincial bottom-protection power grid.
The invention provides a selection method of a guaranteed power supply in a provincial bottom-protecting power grid, which comprises the following steps:
s1, acquiring data parameters of a power grid to be analyzed;
S2, obtaining a system power supply unit set and a corresponding power supply transmission line length set according to the data parameters obtained in the step S1;
s3, determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending line length set according to a guarantee power supply selection principle;
s4, constructing a guarantee power supply selection objective function and corresponding constraint conditions according to the guarantee power supply set and the corresponding candidate power supply sending-out line length set determined in the step S3;
S5, solving the objective function constructed in the step S4 to obtain a guaranteed power supply selection set;
S6, carrying out system inertia safety analysis on the guaranteed power supply selection set obtained in the step S5 by adopting an inertia time constant;
S7, according to the analysis result obtained in the step S6, the selection of the guaranteed power supply in the final provincial bottom-protecting power grid is completed.
The step S2 of obtaining a system power supply unit set and a corresponding power supply sending line length set according to the data parameters obtained in the step S1 specifically comprises the following steps:
Selecting 220 kilovolt and 500 kilovolt voltage level grid-connected thermal power generating units, hydroelectric generating units and gas motor units to obtain a system power supply unit set G which is G= { G 1,G2,...,Gn }, wherein n is the total number of units;
And obtaining the length of the corresponding power supply transmission line of each power supply according to the set G of the system power supply unit, so as to obtain a set L of the corresponding power supply transmission line length as L= { L 1,L2,...,Ln }.
The step S3 of determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending line length set according to a guarantee power supply selection principle specifically includes the following steps:
The following principle is adopted as a guarantee power supply selection principle:
level priority principle: the power supply, the circuit and related equipment ensure the power supply requirement of the core user according to the set level in turn;
the principle of in-situ balancing: the guaranteed power supply is selected nearby, so that self-balancing is realized;
minimum cost principle: selecting short circuits, newly built circuits and large-section wires as power supply paths, selecting stations capable of supplying more users, and guaranteeing the most core transformer substation and user power supply by using the least circuits;
Grid partitioning principle: based on regional power grid division in the provincial power grid, selecting a guarantee power supply in a regional mode; if only one type of unit exists in a certain area or the number of the types of units is less than a set value, the unit selection needs to be comprehensively considered with a power grid of a connected area;
The new energy is not used as a principle of guaranteeing power supply;
Then, respectively sequencing the thermal power units and the hydroelectric units in the selectable guaranteed power supplies to obtain a corresponding candidate guaranteed power supply set and a corresponding candidate power supply sending line length set:
wherein G 1 is a thermal power unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 1 th thermal power unit in a thermal power unit set in an optional guarantee power supply; l 1 is a set of length of a sending-out line corresponding to the thermal power unit in the selectable guaranteed power supply; The length of a sending line corresponding to the N 1 th thermal power unit in the thermal power unit set in the selectable guaranteed power supply is the length of the sending line; g 2 is a hydropower unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 2 th hydroelectric unit in a hydroelectric unit set in an optional guaranteed power supply; The length of the sending-out line corresponding to the N 2 hydropower unit in the hydropower unit set in the optional guaranteed power supply is obtained.
The step S4 of constructing a support power supply selection objective function and corresponding constraint conditions according to the support power supply set and the corresponding candidate power supply sending line length set determined in the step S3 specifically includes the following steps:
the following equation is used as the objective function:
In the middle of The length of a sending-out line corresponding to the (n 1) th thermal power unit in the optional guaranteed power supply is; The length of a sending-out line corresponding to the nth 2 hydroelectric generating set in the optional guaranteed power supply is; Whether the nth 1 thermal power unit is a 0-1 variable of a guaranteed power supply or not, and if the nth 1 thermal power unit is the guaranteed power supply OtherwiseWhether the nth 2 hydroelectric generating set is a 0-1 variable of a guaranteed power supply or not, and if the nth 2 hydroelectric generating set is the guaranteed power supplyOtherwise
The following formula is used as a constraint function:
wherein H thermal is the equivalent inertia time constant of the thermal power guarantee power supply; is the inertia time constant of the nth 1 thermal power generating unit and Wherein the method comprises the steps ofIs the kinetic energy of the nth 1 thermal power generating unit at the rated rotating speed,The capacity of the (n 1) th thermal power unit; h re is a system inertia time constant reference value; p G,thermal,k is the power of the kth thermal power unit; p load,m is the mth core load value; The inertia time constant of the nth 2 hydroelectric generating set; The capacity of the nth 2 hydroelectric generating set; h hydro is the equivalent inertial time constant of the hydropower support power supply; p G,hydro,j is the power of the j-th hydroelectric generating set.
S6, carrying out system inertia safety analysis on the guaranteed power supply selection set obtained in the step S5 by adopting an inertia time constant, wherein the method specifically comprises the following steps of:
calculating an equivalent inertial time constant H sys of the whole system:
If the new energy output is not considered, calculating the equivalent inertia time constant H sys of the whole system as S i is the rated capacity of the ith guaranteed power unit, and H i is the inertia time constant of the ith power unit; the unit comprises a thermal power unit and a hydroelectric unit;
If the new energy output is considered, calculating the equivalent inertia time constant H sys of the whole system as Wherein H s'ys is the equivalent inertial time constant of the system taking the output of the new energy into consideration, andS RES is the accessible capacity of the new energy; η is the permeability of the new energy and
And carrying out system inertia safety analysis by adopting an inertia time constant:
if H sys is more than 4s, the inertia of the system is considered to be sufficient;
If H sys is more than 3s and less than or equal to 4s, the inertia of the system is considered to be general;
if H sys is more than 2s and less than or equal to 3s, the inertia of the system is considered to be lower;
If H sys is less than or equal to 2s, the inertia of the system is considered to be seriously insufficient.
The invention also discloses a system for realizing the selection method of the guaranteed power supply in the provincial level bottom-protecting power grid, which comprises a parameter acquisition module, a power supply unit and line length acquisition module, a bottom-protecting power supply and line length acquisition module, an objective function and constraint condition construction module, a solving module, a system inertia analysis module and a guaranteed power supply selection module; the system comprises a parameter acquisition module, a power supply unit, a line length acquisition module, a bottom protection power supply and line length acquisition module, a target function and constraint condition construction module, a solving module, a system inertia analysis module and a power supply selection guarantee module which are sequentially connected in series; the parameter acquisition module is used for acquiring data parameters of the power grid to be analyzed, and uploading the data to the power supply unit and the line length acquisition module; the power supply unit and line length acquisition module is used for acquiring a system power supply unit set and a corresponding power supply sending line length set according to the received data parameters, and uploading the data to the bottom-protecting power supply and line length acquisition module; the bottom protection power supply and line length acquisition module is used for determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending-out line length set according to received data and a guarantee power supply selection principle, and uploading the data to the objective function and constraint condition construction module; the objective function and constraint condition construction module is used for constructing a guarantee power supply to select an objective function and a corresponding constraint condition according to the received parameters, and uploading the data to the solving module; the solving module is used for solving according to the received data, obtaining a guaranteed power supply selection set and uploading the data to the system inertia analysis module; the system inertia analysis module is used for carrying out system inertia safety analysis by adopting an inertia time constant according to the received data and uploading the data to the guarantee power supply selection module; the guarantee power supply selection module is used for completing the selection of the guarantee power supply in the final provincial level bottom-protection power grid according to the received data.
The invention discloses a method and a system for selecting a guaranteed power supply in a provincial bottom-protecting power grid, which analyze 4 aspects of power supply type, power supply capacity, safe inertia support of a power system and reliable power supply sending-out line, and provides the method and the system for selecting the guaranteed power supply of the bottom-protecting power grid; therefore, the invention can provide basis for constructing the high-proportion new energy power system bottom protection power grid in extreme weather, ensures the safe and reliable power supply requirement of core users in extreme conditions, and has high reliability, better effect and higher efficiency.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of the internal partitioning of the grid in an embodiment of the method of the present invention.
Fig. 3 is a schematic diagram of a functional module of the system according to the present invention.
Detailed Description
The process flow diagram of the present invention is shown in FIG. 1: the invention provides a selection method of a guaranteed power supply in a provincial bottom-protecting power grid, which comprises the following steps:
s1, acquiring data parameters of a power grid to be analyzed;
s2, obtaining a system power supply unit set and a corresponding power supply transmission line length set according to the data parameters obtained in the step S1; the method specifically comprises the following steps:
Selecting 220 kilovolt and 500 kilovolt voltage level grid-connected thermal power generating units, hydroelectric generating units and gas motor units to obtain a system power supply unit set G which is G= { G 1,G2,...,Gn }, wherein n is the total number of units;
according to the set G of the system power supply unit, the length of the corresponding power supply transmission line is obtained, so that the set L of the corresponding power supply transmission line length is L= { L 1,L2,...,Ln };
s3, determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending line length set according to a guarantee power supply selection principle; the method specifically comprises the following steps:
The following principle is adopted as a guarantee power supply selection principle:
level priority principle: the power supply, the circuit and related equipment ensure the power supply requirement of the core user according to the set level in turn;
The principle of in-situ balancing: the guaranteed power supply is selected nearby, so that self-balancing is realized; the power supply selected by each section has island power supply capability, so that stable operation can be kept for a certain period of time in an extreme operation mode, medium hydropower stations can be selected as core power supplies around core users for sections with long power supply paths or unbalanced power supply paths, and the power supply of the core area of the power grid can be updated in time after the planned power supply is put into operation in the later period;
minimum cost principle: selecting short circuits, newly built circuits and large-section wires as power supply paths, selecting stations capable of supplying more users, and guaranteeing the most core transformer substation and user power supply by using the least circuits;
Grid partitioning principle: based on regional power grid division in the provincial power grid, selecting a guarantee power supply in a regional mode; if only one type of unit exists in a certain area or the number of the types of units is less than a set value, the unit selection needs to be comprehensively considered with a power grid of a connected area;
The new energy is not used as a principle of guaranteeing power supply: because of the randomness, volatility and intermittence of the new energy output, the inertia support cannot be provided for the system, the new energy is not considered when a guarantee power supply is selected, and the new energy output can be included in the regional power grid power self-balance analysis;
Then, respectively sequencing the thermal power units and the hydroelectric units in the selectable guaranteed power supplies to obtain a corresponding candidate guaranteed power supply set and a corresponding candidate power supply sending line length set:
wherein G 1 is a thermal power unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 1 th thermal power unit in a thermal power unit set in an optional guarantee power supply; l 1 is a set of length of a sending-out line corresponding to the thermal power unit in the selectable guaranteed power supply; The length of a sending line corresponding to the N 1 th thermal power unit in the thermal power unit set in the selectable guaranteed power supply is the length of the sending line; g 2 is a hydropower unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 2 th hydroelectric unit in a hydroelectric unit set in an optional guaranteed power supply; The length of a sending line corresponding to the N 2 th hydroelectric generating set in the hydroelectric generating set in the optional guaranteed power supply is set; ;
S4, constructing a guarantee power supply selection objective function and corresponding constraint conditions according to the guarantee power supply set and the corresponding candidate power supply sending-out line length set determined in the step S3; the method specifically comprises the following steps:
the following equation is used as the objective function:
In the middle of The length of a sending-out line corresponding to the (n 1) th thermal power unit in the optional guaranteed power supply is; The length of a sending-out line corresponding to the nth 2 hydroelectric generating set in the optional guaranteed power supply is; Whether the nth 1 thermal power unit is a 0-1 variable of a guaranteed power supply or not, and if the nth 1 thermal power unit is the guaranteed power supply OtherwiseWhether the nth 2 hydroelectric generating set is a 0-1 variable of a guaranteed power supply or not, and if the nth 2 hydroelectric generating set is the guaranteed power supplyOtherwise
The following formula is used as a constraint function:
wherein H thermal is the equivalent inertia time constant of the thermal power guarantee power supply; is the inertia time constant of the nth 1 thermal power generating unit and Wherein the method comprises the steps ofIs the kinetic energy of the nth 1 thermal power generating unit at the rated rotating speed,The capacity of the (n 1) th thermal power unit; h re is a system inertia time constant reference value; p G,thermal,k is the power of the kth thermal power unit; p load,m is the mth core load value; The inertia time constant of the nth 2 hydroelectric generating set; The capacity of the nth 2 hydroelectric generating set; h hydro is the equivalent inertial time constant of the hydropower support power supply; p G,hydro,j is the power of the j-th hydroelectric generating set;
S5, solving the objective function constructed in the step S4 to obtain a guaranteed power supply selection set;
s6, carrying out system inertia safety analysis on the guaranteed power supply selection set obtained in the step S5 by adopting an inertia time constant; the method specifically comprises the following steps:
calculating an equivalent inertial time constant H sys of the whole system:
If the new energy output is not considered, calculating the equivalent inertia time constant H sys of the whole system as S i is the rated capacity of the ith guaranteed power unit, and H i is the inertia time constant of the ith power unit; the unit comprises a thermal power unit and a hydroelectric unit;
If the new energy output is considered, calculating the equivalent inertia time constant H sys of the whole system as Wherein H s'ys is the equivalent inertial time constant of the system taking the output of the new energy into consideration, andS RES is the accessible capacity of the new energy; η is the permeability of the new energy and
And carrying out system inertia safety analysis by adopting an inertia time constant:
if H sys is more than 4s, the inertia of the system is considered to be sufficient;
If H sys is more than 3s and less than or equal to 4s, the inertia of the system is considered to be general;
if H sys is more than 2s and less than or equal to 3s, the inertia of the system is considered to be lower;
If H sys is less than or equal to 2s, the inertia of the system is considered to be seriously insufficient;
S7, according to the analysis result obtained in the step S6, the selection of the guaranteed power supply in the final provincial bottom-protecting power grid is completed.
The method of the invention is further described in connection with one embodiment as follows:
taking a certain provincial power grid as an example, the provincial power grid is analyzed to ensure the selection of a power supply and ensure the inertia supporting function of the power supply on the system. The provincial power grid 220 kv and above voltage class comprises a unit, kinetic energy of the unit at rated rotation speed, rated capacity of the unit and inertial time constant of the unit as shown in the following table 1:
table 1 provincial power grid 220 KV and above voltage class unit information schematic table
As can be seen from the table, the voltage level of the provincial power grid is 220 kilovolts and above, 18 thermal power plants are provided, and the capacity of the total assembly machine is 20314.3MW; the total power plant is 20 seats, and the capacity of the total assembly machine is 10495MW.
Based on the core load of the province statistics, and partitioning the province-city, the following results shown in table 2 can be obtained:
Table 2 provincial grid core load and partition schematic table
According to table 2, the provincial grid internal partition diagram is shown in fig. 2. By combining tables 1 and 2, the installed power plant conditions and core load conditions of different partitions can be obtained as shown in the following table 3:
table 3 provincial grid core load and plant partition Condition schematic
According to tables 1,2 and 3, the hydropower is mainly concentrated in the S5 and S6 areas, the S3 and S4 areas are not provided with hydropower plants, and the S6 area is not provided with a thermal power plant. In order to ensure that the equivalent inertia of the system is sufficient, namely the equivalent inertia time constant of the system is more than 4s, and simultaneously the output of the hydroelectric generating set and the thermal power generating set meets the power supply requirement of a core load, the following core power supply selection scheme can be obtained:
(1) The S1 subarea in the system selects 600MW of a 220 kilovolt level unit of a hydropower plant 28, a hydropower plant 33, a thermal power plant 32 and a thermal power plant 21, and the line length is 8.45km, at the moment, the installed capacity of the area is 3250MW, the inertial time constant of the area system is 4.09S, and the sent line length is 101.12km;
(2) The S2 subareas in the system select a hydropower plant 3, a hydropower plant 20 and a thermal power plant 29, the installed capacity of the area is 1360MW, the inertia time constant is 4.13S, and the length of a sending line is 151.14km;
(3) In the system, the section S3 selects a thermal power plant 8 and a thermal power plant 30 at a 220 kilovolt level unit 600MW and the line length is 9.37km, the installed capacity of the area is 1260MW, the inertial time constant of the area system is 4.47S, and the length of the sent line is 17.95km;
(4) In the system, a thermal power plant 11 and a thermal power plant 12 are selected in an S4 partition mode, the installed capacity of the area is 1800MW, the inertial time constant of the area system is 3.55S, and the length of a sending line is 87.2km;
(5) In the system, the section S5 selects 660MW of the thermal power plant 13 at a 220 kilovolt level unit, the line length is 9.381km, the hydropower plant 7, the installed capacity of the area is 840MW, the inertial time constant of the area system is 3.76S, and the length of the sent line is 15.38km;
(6) The S6 subarea in the system selects a hydropower plant 6, a hydropower plant 14 and a hydropower plant 22, the installed capacity of the area is 2062.5MW, the inertial time constant of the area system is 5.86S, and the length of a sending line is 57.95km;
And (3) integrating the analysis of the 6 areas, and obtaining the guaranteed power supply and the minimum power supply sending line length of each area under the condition of meeting the guaranteed power supply selection principle, and meeting the constraint of a provincial power grid and a regional power grid. The equivalent inertia time constant of the whole system is 4.37s, the total capacity of the unit is 10572.5MW, and the hydropower unit 4352.5MW. When the output of new energy sources on the distribution network layer is considered, the equivalent inertia time constant of the system is required to be larger than 4s, the new energy source permeability is 8.47%, and the maximum access capacity of the new energy sources is 978MW.
Fig. 3 is a schematic diagram of a system functional module according to the present invention: the system for realizing the selection method of the guaranteed power supply in the provincial level bottom-protecting power grid comprises a parameter acquisition module, a power supply unit and line length acquisition module, a bottom-protecting power supply and line length acquisition module, an objective function and constraint condition construction module, a solving module, a system inertia analysis module and a guaranteed power supply selection module; the system comprises a parameter acquisition module, a power supply unit, a line length acquisition module, a bottom protection power supply and line length acquisition module, a target function and constraint condition construction module, a solving module, a system inertia analysis module and a power supply selection guarantee module which are sequentially connected in series; the parameter acquisition module is used for acquiring data parameters of the power grid to be analyzed, and uploading the data to the power supply unit and the line length acquisition module; the power supply unit and line length acquisition module is used for acquiring a system power supply unit set and a corresponding power supply sending line length set according to the received data parameters, and uploading the data to the bottom-protecting power supply and line length acquisition module; the bottom protection power supply and line length acquisition module is used for determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending-out line length set according to received data and a guarantee power supply selection principle, and uploading the data to the objective function and constraint condition construction module; the objective function and constraint condition construction module is used for constructing a guarantee power supply to select an objective function and a corresponding constraint condition according to the received parameters, and uploading the data to the solving module; the solving module is used for solving according to the received data, obtaining a guaranteed power supply selection set and uploading the data to the system inertia analysis module; the system inertia analysis module is used for carrying out system inertia safety analysis by adopting an inertia time constant according to the received data and uploading the data to the guarantee power supply selection module; the guarantee power supply selection module is used for completing the selection of the guarantee power supply in the final provincial level bottom-protection power grid according to the received data.
Claims (3)
1. A selection method for a guaranteed power supply in a provincial bottom-guaranteed power grid comprises the following steps:
s1, acquiring data parameters of a power grid to be analyzed;
s2, obtaining a system power supply unit set and a corresponding power supply transmission line length set according to the data parameters obtained in the step S1; the method specifically comprises the following steps:
Selecting 220 kilovolt and 500 kilovolt voltage level grid-connected thermal power generating units, hydroelectric generating units and gas motor units to obtain a system power supply unit set G which is G= { G 1,G2,...,Gn }, wherein n is the total number of units;
according to the set G of the system power supply unit, the length of the corresponding power supply transmission line is obtained, so that the set L of the corresponding power supply transmission line length is L= { L 1,L2,...,Ln };
s3, determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending line length set according to a guarantee power supply selection principle; the method specifically comprises the following steps:
The following principle is adopted as a guarantee power supply selection principle:
level priority principle: the power supply, the circuit and related equipment ensure the power supply requirement of the core user according to the set level in turn;
the principle of in-situ balancing: the guaranteed power supply is selected nearby, so that self-balancing is realized;
minimum cost principle: selecting short circuits, newly built circuits and large-section wires as power supply paths, selecting stations capable of supplying more users, and guaranteeing the most core transformer substation and user power supply by using the least circuits;
Grid partitioning principle: based on regional power grid division in the provincial power grid, selecting a guarantee power supply in a regional mode; if only one type of unit exists in a certain area or the number of the types of units is less than a set value, the unit selection needs to be comprehensively considered with a power grid of a connected area;
The new energy is not used as a principle of guaranteeing power supply;
Then, respectively sequencing the thermal power units and the hydroelectric units in the selectable guaranteed power supplies to obtain a corresponding candidate guaranteed power supply set and a corresponding candidate power supply sending line length set:
wherein G 1 is a thermal power unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 1 th thermal power unit in a thermal power unit set in an optional guarantee power supply; l 1 is a set of length of a sending-out line corresponding to the thermal power unit in the selectable guaranteed power supply; The length of a sending line corresponding to the N 1 th thermal power unit in the thermal power unit set in the selectable guaranteed power supply is the length of the sending line; g 2 is a hydropower unit set in an optional guaranteed power supply; The method is characterized in that the method is an N 2 th hydroelectric unit in a hydroelectric unit set in an optional guaranteed power supply; the length of a sending line corresponding to the N 2 th hydroelectric generating set in the hydroelectric generating set in the optional guaranteed power supply is set;
S4, constructing a guarantee power supply selection objective function and corresponding constraint conditions according to the guarantee power supply set and the corresponding candidate power supply sending-out line length set determined in the step S3; the method specifically comprises the following steps:
the following equation is used as the objective function:
In the middle of The length of a sending-out line corresponding to the (n 1) th thermal power unit in the optional guaranteed power supply is; The length of a sending-out line corresponding to the nth 2 hydroelectric generating set in the optional guaranteed power supply is; Whether the nth 1 thermal power unit is a 0-1 variable of a guaranteed power supply or not, and if the nth 1 thermal power unit is the guaranteed power supply Otherwise Whether the nth 2 hydroelectric generating set is a 0-1 variable of a guaranteed power supply or not, and if the nth 2 hydroelectric generating set is the guaranteed power supplyOtherwise
The following formula is used as a constraint function:
wherein H thermal is the equivalent inertia time constant of the thermal power guarantee power supply; is the inertia time constant of the nth 1 thermal power generating unit and Wherein the method comprises the steps ofIs the kinetic energy of the nth 1 thermal power generating unit at the rated rotating speed,The capacity of the (n 1) th thermal power unit; h re is a system inertia time constant reference value; p G,thermal,k is the power of the kth thermal power unit; p load,m is the mth core load value; The inertia time constant of the nth 2 hydroelectric generating set; The capacity of the nth 2 hydroelectric generating set; h hydro is the equivalent inertial time constant of the hydropower support power supply; p G,hydro,j is the power of the j-th hydroelectric generating set;
S5, solving the objective function constructed in the step S4 to obtain a guaranteed power supply selection set;
S6, carrying out system inertia safety analysis on the guaranteed power supply selection set obtained in the step S5 by adopting an inertia time constant;
S7, according to the analysis result obtained in the step S6, the selection of the guaranteed power supply in the final provincial bottom-protecting power grid is completed.
2. The method for selecting the guaranteed power supply in the provincial bottom-protecting power grid according to claim 1, wherein the step S6 is characterized in that the step S6 is performed on the guaranteed power supply selection set obtained in the step S5, and the inertial time constant is adopted to perform system inertia safety analysis, and the method specifically comprises the following steps:
calculating an equivalent inertial time constant H sys of the whole system:
If the new energy output is not considered, calculating the equivalent inertia time constant H sys of the whole system as S i is the rated capacity of the ith guaranteed power unit, and H i is the inertia time constant of the ith power unit; the unit comprises a thermal power unit and a hydroelectric unit;
If the new energy output is considered, calculating the equivalent inertia time constant H sys of the whole system as Wherein H s'ys is the equivalent inertial time constant of the system taking the output of the new energy into consideration, andS RES is the accessible capacity of the new energy; η is the permeability of the new energy and
And carrying out system inertia safety analysis by adopting an inertia time constant:
if H sys is more than 4s, the inertia of the system is considered to be sufficient;
If H sys is more than 3s and less than or equal to 4s, the inertia of the system is considered to be general;
if H sys is more than 2s and less than or equal to 3s, the inertia of the system is considered to be lower;
If H sys is less than or equal to 2s, the inertia of the system is considered to be seriously insufficient.
3. The system for realizing the selection method of the guaranteed power supply in the provincial level bottom-protected power grid as claimed in claim 1 or 2 is characterized by comprising a parameter acquisition module, a power supply unit and line length acquisition module, a bottom-protected power supply and line length acquisition module, an objective function and constraint condition construction module, a solving module, a system inertia analysis module and a guaranteed power supply selection module; the system comprises a parameter acquisition module, a power supply unit, a line length acquisition module, a bottom protection power supply and line length acquisition module, a target function and constraint condition construction module, a solving module, a system inertia analysis module and a power supply selection guarantee module which are sequentially connected in series; the parameter acquisition module is used for acquiring data parameters of the power grid to be analyzed, and uploading the data to the power supply unit and the line length acquisition module; the power supply unit and line length acquisition module is used for acquiring a system power supply unit set and a corresponding power supply sending line length set according to the received data parameters, and uploading the data to the bottom-protecting power supply and line length acquisition module; the bottom protection power supply and line length acquisition module is used for determining a corresponding candidate guarantee power supply set and a corresponding candidate power supply sending-out line length set according to received data and a guarantee power supply selection principle, and uploading the data to the objective function and constraint condition construction module; the objective function and constraint condition construction module is used for constructing a guarantee power supply to select an objective function and a corresponding constraint condition according to the received parameters, and uploading the data to the solving module; the solving module is used for solving according to the received data, obtaining a guaranteed power supply selection set and uploading the data to the system inertia analysis module; the system inertia analysis module is used for carrying out system inertia safety analysis by adopting an inertia time constant according to the received data and uploading the data to the guarantee power supply selection module; the guarantee power supply selection module is used for completing the selection of the guarantee power supply in the final provincial level bottom-protection power grid according to the received data.
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