CN113191675B - Multi-direct-current-sending-end power grid planning scheme adaptability evaluation method and system - Google Patents
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Abstract
The invention discloses a method and a system for evaluating the adaptability of a multi-direct-current transmission-end power grid planning scheme, which relate to the technical field of power system safety, and have the technical scheme key points that: calculating to obtain a first parameter in system strength adaptability parameters according to network basic information; selecting operation mode information to perform load flow calculation to obtain a second parameter of the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter; performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter; and comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters to obtain an adaptability evaluation result. According to the invention, multiple influence factors are considered, comprehensive evaluation is carried out from the perspective of the overall adaptability of the grid structure, and the adaptability of the power grid at the sending end to support large-scale direct current delivery can be effectively reflected.
Description
Technical Field
The invention relates to the technical field of power system safety, in particular to a method and a system for evaluating the adaptability of a multi-direct-current transmission end power grid planning scheme.
Background
Because the energy resources and the power demand in China have the characteristic of reverse distribution, the west-east power transmission becomes a strategic measure for realizing the optimal allocation of the energy resources. In order to meet the urgent need of long-distance, large-capacity and trans-regional delivery of hydropower resources in western regions, the construction of a multi-loop ultrahigh-voltage large-capacity direct-current transmission channel becomes a key way for solving the problem. With the gradual expansion of the scale of extra-high voltage direct current transmission, the grid pattern, the operation form and the stability characteristics of a multi-direct current transmission end grid are deeply changed, the contradiction of strong direct current and weak alternating current is prominent, the complexity and the vulnerability of an alternating current and direct current hybrid grid structure are continuously increased, and the grid adaptability faces new challenges.
The existing ultra-high voltage direct current operation practice shows that: the strength of the AC network frame must reach a certain level, and the scale of the AC network frame must be matched with the DC capacity so as to bear the huge power impact caused by the large-capacity DC fault disturbance. Therefore, the key point for solving the problem of strong direct current and weak direct current is to strengthen the coordinated development of the backbone grid frame of the alternating current power grid and high-capacity direct current power transmission, match the backbone grid frame with the direct current capacity and scale, construct a grid frame with coordinated alternating current and direct current, and realize the comprehensive optimization and upgrade of the grid structure.
And the construction of a strong direct-current and strong alternating-current grid frame with alternating-current and direct-current coordination requires careful evaluation of the adaptability of the multi-transmission-end direct-current power grid planning scheme. Therefore, how to research and design a method and a system for evaluating the adaptability of a multi-direct-current-transmission-end power grid planning scheme is a problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and a system for evaluating the adaptability of a multi-direct-current-sending-end power grid planning scheme, and provide reference data for power grid planning and decision-making personnel to construct a strong direct-current strong alternating-current grid frame with alternating current and direct current coordination.
The technical purpose of the invention is realized by the following technical scheme:
in a first aspect, a method for evaluating the adaptability of a multi-direct-current transmission-end power grid planning scheme is provided, which comprises the following steps:
constructing an adaptability evaluation parameter model of a multi-direct-current transmission end power grid;
acquiring network basic information of a target planning scheme, and calculating to obtain a first parameter in system strength adaptability parameters according to the network basic information;
selecting operation mode information in the target planning scheme to perform load flow calculation to obtain a second parameter of the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter;
performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter;
and comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result.
Further, the calculation process of the economic development adaptability parameter specifically includes:
acquiring regional economic development strategy information related to a target planning scheme;
and carrying out load flow calculation according to the regional economic development strategy information to obtain economic development adaptability parameters consisting of power balance coefficients and network loss coefficients.
Further, the calculation process of the power balance coefficient specifically includes:
wherein λ represents a power balance coefficient; d represents a power supply amount, a transformation capacity, or a power generation amount; s represents the power demand;
the calculation process of the network loss coefficient specifically comprises the following steps:
wherein α represents a network loss coefficient; pLOSSRepresenting line loss active power; pGRepresenting the active power output of the generator.
Further, the calculation process of the energy structure adaptive parameter specifically includes:
acquiring reasonable energy development scale information and energy optimization configuration information of a target planning scheme;
and performing load flow calculation according to the reasonable energy development scale information and the energy optimization configuration information to obtain an energy structure adaptability parameter consisting of the clean energy ratio and the clean energy trans-regional consumption ratio.
Further, the calculation process of the clean energy ratio specifically comprises the following steps:
wherein, F represents the proportion of clean energy; c represents the installed capacity of clean energy such as hydropower, light energy, wind energy and the like; z represents total installed capacity;
the calculation process of the cross-region consumption ratio of the clean energy is specifically as follows:
in the formula: p' represents the clean energy trans-regional consumption ratio; y is1Representing the capacity of the receiving end power grid for consuming clean energy; y is2And the total power generation amount of the clean energy is shown.
Further, the system strength adaptability parameter is composed of a first parameter and a second parameter;
the calculation process of the first parameter is as follows: acquiring associated information of a direct current line and a hydropower channel in a network, and calculating to obtain a direct current matching line power supply capacity ratio and a hydropower channel power supply capacity ratio according to the associated information; acquiring system startup and shutdown information under different operation modes, and calculating to obtain system equivalent inertia under different operation modes according to the system startup and shutdown information;
the calculation process of the second parameter is as follows: and obtaining a typical operation mode in the operation mode information, and carrying out load flow calculation to obtain a multi-direct-current sending short circuit ratio and an important section load flow rate.
Further, the calculation process of the power supply capacity ratio of the direct current matching line specifically includes:
wherein R isdRepresenting the power supply capacity ratio of the direct current matching line; sl,iExpressed as the maximum transmission capacity of the 500kV line connected to the dc converter station; m represents the number of 500kV lines connected with the direct current converter station; sdRepresenting rated transmission capacity of the direct current converter station;
the calculation process of the power supply capacity ratio of the hydroelectric channel specifically comprises the following steps:
wherein R iswRepresenting the proportion of the power supply capacity of the hydropower channel; s. thew,iExpressed as the maximum capacity of delivery of the hydroelectric channel outlet; m is the number of hydroelectric channel lines; sp,jRepresenting the capacity of the hydroelectric generating set; n is the total number of water installations on the channel;
the calculation process of the equivalent inertia of the system specifically comprises the following steps:
wherein HsRepresenting the equivalent inertia of the system; h isJRepresenting the inertia time constant of the unit; sNRepresenting a rated capacity of the generator set;
the calculation process of the multi-direct-current sending short-circuit ratio specifically comprises the following steps:
wherein S isaciIndicating i-th return DC line rectificationShort circuit capacity of the side bus; pdi、PdjRespectively representing the active power transmitted by the ith and jth return direct current lines; delta Ui、ΔUjRespectively showing voltage variation of a rectifying side bus i and a rectifying side bus j after the rectifying side bus i is put into a small-capacity three-phase symmetrical reactor or capacitor; m is a group ofiIndicating the multi-DC sending short-circuit ratio corresponding to the ith return DC line;
the important section tidal current load rate is the ratio of the actual active power flow to the rated active power flow on the section; the higher the section tidal current load rate is, the closer the line on the section is to the transmission limit is.
Further, the calculation process of the safety and stability adaptive parameter specifically includes:
calculating the N-1 passing rate, the maximum power angle difference of the generator after the alternating current fault and the maximum voltage deviation of the bus after the alternating current fault according to the matched alternating current line fault mode;
calculating the power flow transfer rate of an important section after the fault, the maximum power angle difference of a generator after the fault, the maximum voltage deviation of a bus after the fault, the transient extreme value frequency of a system after the fault and the quasi-steady-state frequency of the system after the fault according to the matched direct-current line fault mode;
and carrying out three-phase short-circuit current verification on the buses to obtain the short-circuit current of each three-phase bus.
Further, the calculation process of the N-1 passage rate specifically includes:
wherein alpha represents the passing rate of the equipment power flow N-1; n is a radical ofpThe system can recover the power loss load to supply power through the switching operation after the single fault occurs to the same voltage class and the same type of elements, and ensure the total number of safety conditions of the system without element overload when the normal continuous power supply is performed to the user; n is a radical oftThe total number of elements of the same voltage class and the same type is represented;
the calculation process of the maximum power angle difference of the generator after the fault is specifically as follows:
δ＝max|δi-δj|
wherein, deltai、δjAnd respectively representing the power angles of the ith generator and the jth generator after the fault.
In a second aspect, a system for evaluating the adaptability of a multi-dc-transmission-end power grid planning scheme is provided, which includes:
the model construction module is used for constructing an adaptability evaluation parameter model of the multi-direct-current transmission end power grid;
the network information calculation module is used for acquiring network basic information of the target planning scheme and calculating to obtain a first parameter in the system strength adaptability parameters according to the network basic information;
the power flow calculation module is used for selecting the operation mode information in the target planning scheme to carry out power flow calculation to obtain a second parameter in the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter;
the simulation module is used for performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter;
and the evaluation module is used for comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result.
Compared with the prior art, the invention has the following beneficial effects:
starting from the concept of adaptability, a comprehensive adaptability evaluation parameter model of the multi-DC transmitting-end power grid is constructed based on the adaptability to economic development, the adaptability to energy structures, the adaptability to system strength and the adaptability to safety and stability. The model comprehensively evaluates from the perspective of the overall adaptability of the grid structure by considering multiple influence factors, can effectively reflect the adaptability of a sending-end power grid to supporting large-scale direct current delivery, and provides a reference basis for power grid planning and decision-making personnel to construct a strong direct current and strong alternating current grid structure with alternating current and direct current coordination.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart in an embodiment of the invention;
FIG. 2 is a system architecture diagram in an embodiment of the present invention;
fig. 3 shows two planning schemes for an extra-high voltage alternating-current grid of a provincial power grid in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1: as shown in fig. 1, the method for evaluating the adaptability of a multi-dc-transmission-end power grid planning scheme includes the following steps:
s1: constructing an adaptability evaluation parameter model of a multi-direct-current transmission end power grid;
s2: acquiring network basic information of a target planning scheme, and calculating to obtain a first parameter in system strength adaptability parameters according to the network basic information;
s3: selecting operation mode information in the target planning scheme to perform load flow calculation to obtain a second parameter of the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter;
s4: performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter;
s5: and comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result.
The invention provides a relevant parameter electric power balance coefficient and a network loss coefficient for evaluating the economic development adaptability of a multi-direct-current transmission end power grid based on regional economic development. The calculation process of the economic development adaptability parameters specifically comprises the following steps: acquiring regional economic development strategy information related to a target planning scheme; and carrying out load flow calculation according to the regional economic development strategy information to obtain economic development adaptability parameters consisting of power balance coefficients and network loss coefficients.
The calculation process of the power balance coefficient specifically comprises the following steps:
wherein λ represents a power balance coefficient; d represents a power supply amount, a transformation capacity, or a power generation amount; s represents the power demand.
The calculation process of the network loss coefficient specifically comprises the following steps:
wherein α represents a network loss coefficient; pLOSSRepresenting line loss active power; pGRepresenting the active power output of the generator.
The invention mainly evaluates the reasonable development scale of energy and realizes the optimal configuration of the energy, and the improvement of the proportion of new energy in a power supply structure is also a problem to be considered for power grid construction in order to ensure the energy safety and solve the environmental protection problem. The calculation process of the adaptive parameters of the energy structure specifically comprises the following steps: acquiring reasonable energy development scale information and energy optimization configuration information of a target planning scheme; and performing load flow calculation according to the reasonable energy development scale information and the energy optimization configuration information to obtain an energy structure adaptability parameter consisting of the clean energy ratio and the clean energy trans-regional consumption ratio.
The calculation process of the clean energy ratio specifically comprises the following steps:
wherein, F represents the ratio of clean energy; c represents the installed capacity of clean energy such as hydropower, light energy, wind energy and the like; z represents the total installed capacity.
The method has the advantages that the optimized configuration of the clean energy across areas can be effectively improved by building a large power grid, the capacity of the large power grid for optimally configuring the clean energy can be well reflected by the specific absorption proportion of the clean energy across areas, and the calculation process of the specific absorption proportion of the clean energy across areas specifically comprises the following steps:
in the formula: p' represents the clean energy trans-regional consumption ratio; y is1Representing the capacity of the receiving end power grid for consuming clean energy; y is2And the total power generation amount of the clean energy is shown.
The strength of the alternating current system directly affects the stable operation state of the high-voltage direct current system, and the dynamic performance and fault recovery characteristics when a fault occurs. The system strength adaptability parameter is composed of a first parameter and a second parameter.
The first parameter is calculated as follows: acquiring associated information of a direct current line and a hydropower channel in a network, and calculating to obtain a direct current matching line power supply capacity ratio and a hydropower channel power supply capacity ratio according to the associated information; and obtaining system startup and shutdown information under different operation modes, and calculating to obtain system equivalent inertia under different operation modes according to the system startup and shutdown information.
The second parameter is calculated as follows: and obtaining a typical operation mode in the operation mode information, and carrying out load flow calculation to obtain a multi-direct-current output short circuit ratio and an important section load flow rate.
The power supply capacity matching adaptation degree of the direct current matching lines can reflect the coordination adaptation degree of the power supply capacity of each direct current line, and the calculation process of the power supply capacity matching of the direct current matching lines specifically comprises the following steps:
wherein R isdRepresenting the power supply capacity ratio of the direct current matching line; sl,iIs shown connected to the dc converter stationThe maximum transmission capacity of a 500kV line; m represents the number of 500kV lines connected with the direct current converter station; sdIndicating the rated transport capacity of the dc converter station.
The matching adaptation degree of the power supply capacity of the hydropower channel can reflect the coordination adaptation condition of the power supply capacity of the provincial hydropower channel and the provincial hydropower power supply, and has important reference significance for the provincial hydropower outward delivery. The calculation process of the hydropower channel power supply capacity ratio is specifically as follows:
wherein R iswRepresenting the proportion of the power supply capacity of the hydropower channel; sw,iExpressed as the maximum capacity of delivery of the hydroelectric channel outlet; m is the number of hydroelectric channel lines; sp,jRepresenting the capacity of the hydroelectric generating set; n is the total number of water installations on the channel.
The calculation process of the equivalent inertia of the system specifically comprises the following steps:
wherein HsRepresenting the equivalent inertia of the system; h isJRepresenting the inertia time constant of the unit; sNIndicating the rated capacity of the generator set.
The multi-direct-current-output short-circuit ratio is used for reflecting the voltage supporting capacity of a power grid at a transmitting end to multi-output direct currents, and the calculation process of the multi-direct-current-output short-circuit ratio is as follows:
wherein S isaciThe short-circuit capacity of the i-th return direct-current line rectification side bus is shown; pdi、PdjRespectively representing the active power transmitted by the ith and jth return direct current lines; delta Ui、ΔUjRespectively shows the sum of the position of a rectifying side bus i after the rectifying side bus i is put into a small-capacity three-phase symmetrical reactor or capacitorThe voltage variation at the bus j on the rectification side; miIndicating the multi-dc output short-circuit ratio corresponding to the i-th dc return line.
The important section tidal current load rate is the ratio of the actual active power flow to the rated active power flow on the section; the higher the section tidal current load rate is, the closer the line on the section is to the transmission limit, and the safety and stability of the system can be reduced by the excessively high section tidal current load rate.
Power grid accidents occur at times due to the influence of the power system itself and external disturbances. This not only causes the economic benefits of the electric power company to be lost, but also has a serious impact on the electric power consumers and the whole society. Therefore, safety is one of the most important attributes of an electric power system. The calculation process of the safety and stability adaptability parameters specifically comprises the following steps: calculating the N-1 passing rate, the maximum power angle difference of the generator after the alternating current fault and the maximum voltage deviation of the bus after the alternating current fault according to the matched alternating current line fault mode; calculating the power flow transfer rate of an important section after the fault, the maximum power angle difference of a generator after the fault, the maximum voltage deviation of a bus after the fault, the transient extreme value frequency of a system after the fault and the quasi-steady-state frequency of the system after the fault according to the matched direct-current line fault mode; and carrying out three-phase short-circuit current verification on the buses to obtain the short-circuit current of each three-phase bus.
The N-1 passing rate is the integral quantitative description of whether the normal continuous power supply capacity of a user can be maintained when a certain important element is lost to a power grid. The calculation process of the N-1 passing rate specifically comprises the following steps:
wherein alpha represents the passing rate of the equipment power flow N-1; n is a radical ofpThe method has the advantages that the power loss load can be recovered to supply power through the switch operation after the same voltage class and the same type of elements have single faults, and the total number of safety conditions of the system without element overload during normal and continuous power supply of users is ensured; n is a radical oftRepresenting the same voltage class and the total number of elements of the same type.
The flow transfer rate of the important section after the fault can be expressed as the ratio of the variation of the flow on the important section after the fault occurs to the original flow of the section. The smaller the power flow transfer rate on an important section after a certain fault occurs, the smaller the impact influence of the fault on the system is, and the higher the safe and stable operation level of the system is.
The calculation process of the maximum power angle difference of the generator after the fault is specifically as follows:
δ＝max|δi-δj|
wherein, deltai、δjRespectively showing the power angles of the ith and jth generators after the fault.
Example 2: the system for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme, as shown in fig. 2, comprises a model construction module, a network information calculation module, a load flow calculation module, a simulation module and an evaluation module. The model construction module is used for constructing an adaptability evaluation parameter model of the multi-direct-current transmission end power grid; the network information calculation module is used for acquiring network basic information of the target planning scheme and calculating to obtain a first parameter in the system strength adaptability parameters according to the network basic information; the power flow calculation module is used for selecting the operation mode information in the target planning scheme to carry out power flow calculation to obtain a second parameter in the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter; the simulation module is used for performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter; and the evaluation module is used for comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result.
Example 3: as shown in fig. 3, two planning schemes A, B for an extra-high voltage ac grid of a provincial power grid are further target planning schemes. The step S2 is performed on the target planning scheme, and the result of obtaining the system strength adaptability partial index is shown in table 1.
TABLE 1
Equivalent inertia of system in large and small running modes
Unit: second of
The step S3 is performed on the target planning scheme, and the partial index result is shown in table 2.
TABLE 2
Coefficient of power balance
Unit: thousands volt-ampere and thousands watt
| Mode of operation | Variable capacitance | Internal load saving | Power delivered from | Coefficient of power balance | Reference value |
| Elegant style | 34082 | 6650 | 6634.3 | 2.57 | ＞1.1 |
| Withered square formula | 32010 | 6439.4 | 2880 | 3.43 | ＞1.2 |
Loss of system condition
Unit: thousands of kilowatts and thousands of volt-amperes
Multiple DC output short circuit ratio
Unit: MW, MVA
The step S4 is performed on the target planning scheme to obtain partial index results as shown in table 3, and finally the scheme a and the scheme B obtained according to various adaptive indexes are substantially the same in terms of economic development adaptability, energy structure adaptability and system strength adaptability, while the scheme a is significantly better than the scheme B in terms of safety and stability adaptability. The adaptive evaluation parameter model may be evaluated and analyzed in various ways, such as a weight ratio analysis.
TABLE 3
System frequency extreme value and quasi-steady-state frequency after direct-current lockout fault
Unit: thousands kilowatt and Hertz
Large square type AC fault stability calculation result
Torpedo mode 500kV bus three-phase short-circuit fault short-circuit current interval distribution
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme is characterized by comprising the following steps of:
constructing an adaptability evaluation parameter model of a multi-direct-current transmission end power grid;
acquiring network basic information of a target planning scheme, and calculating to obtain a first parameter in system strength adaptability parameters according to the network basic information;
selecting operation mode information in the target planning scheme to perform load flow calculation to obtain a second parameter of an economic development adaptability parameter, an energy structure adaptability parameter and a system strength adaptability parameter;
performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter;
comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result;
the system strength adaptability parameter consists of a first parameter and a second parameter;
the calculation process of the first parameter is as follows: acquiring associated information of a direct current line and a hydropower channel in a network, and calculating to obtain a direct current matching line power supply capacity ratio and a hydropower channel power supply capacity ratio according to the associated information; acquiring system startup and shutdown information in different operation modes, and calculating to obtain system equivalent inertia in different operation modes according to the system startup and shutdown information;
the calculation process of the second parameter is as follows: obtaining a typical operation mode in the operation mode information, and carrying out load flow calculation to obtain a multi-direct-current sending short circuit ratio and an important section load flow rate;
the calculation process of the power supply capacity ratio of the direct current matching line specifically comprises the following steps:
wherein R isdThe power supply capacity ratio of the direct current matching line is represented; sl,iExpressed as the maximum transmission capacity of the 500kV line connected to the dc converter station; m represents the number of 500kV lines connected with the direct current converter station; sdRepresenting rated transmission capacity of the direct current converter station;
the calculation process of the hydropower channel power supply capacity ratio is specifically as follows:
wherein R iswRepresenting the proportion of the power supply capacity of the hydropower channel; sw,iExpressed as the maximum capacity of delivery of the hydroelectric channel outlet; m is the number of hydroelectric channel lines; sp,jRepresenting the capacity of the hydroelectric generating set; n is the total number of water installations on the channel;
the calculation process of the equivalent inertia of the system specifically comprises the following steps:
wherein HsRepresenting the equivalent inertia of the system; h is a total ofJRepresenting the inertia time constant of the unit; sNRepresenting a rated capacity of the generator set;
the calculation process of the multi-direct-current sending short-circuit ratio specifically comprises the following steps:
wherein S isaciThe short-circuit capacity of the i-th return direct-current line rectification side bus is shown; pdi、PdjRespectively representing the active power transmitted by the ith and jth return direct current lines; delta Ui、ΔUjRespectively representing voltage variation of a rectifying side bus i and voltage variation of a rectifying side bus j after the rectifying side bus i is put into a small-capacity three-phase symmetrical reactor or capacitor; miIndicating the multi-DC sending short-circuit ratio corresponding to the ith return DC line;
the important section power flow load rate is the ratio of the actual active power flow and the rated active power flow on the section; the higher the section tidal current load rate is, the closer the line on the section is to the transmission limit is.
2. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme according to claim 1, wherein the calculation process of the economic development adaptability parameters specifically comprises the following steps:
acquiring regional economic development strategy information related to a target planning scheme;
and carrying out load flow calculation according to the regional economic development strategy information to obtain economic development adaptability parameters consisting of power balance coefficients and network loss coefficients.
3. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme according to claim 2, wherein the calculation process of the power balance coefficient specifically comprises the following steps:
wherein λ represents a power balance coefficient; d represents a power supply amount, a transformation capacity, or a power generation amount; s represents the power demand;
the calculation process of the network loss coefficient specifically comprises the following steps:
wherein α represents a network loss coefficient; pLOSSRepresenting line loss active power; pGRepresenting the active power output of the generator.
4. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme according to claim 1, wherein the calculation process of the energy structure adaptability parameters specifically comprises the following steps:
acquiring reasonable energy development scale information and energy optimization configuration information of a target planning scheme;
and performing load flow calculation according to the reasonable energy development scale information and the energy optimization configuration information to obtain an energy structure adaptability parameter consisting of the clean energy ratio and the clean energy trans-regional consumption ratio.
5. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme according to claim 4, wherein the calculation process of the clean energy ratio specifically comprises the following steps:
wherein, F represents the proportion of clean energy; c represents the installed capacity of the clean energy of water, electricity, light energy and wind energy; z represents total installed capacity;
the calculation process of the cross-region consumption ratio of the clean energy is specifically as follows:
in the formula: p' represents the clean energy trans-regional consumption ratio; y is1Representing the capacity of the receiving end power grid for consuming clean energy; y is2And the total power generation amount of the clean energy is shown.
6. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme according to any one of claims 1 to 5, wherein the calculation process of the safety and stability adaptability parameters specifically comprises the following steps:
calculating the N-1 passing rate, the maximum power angle difference of the generator after the alternating current fault and the maximum voltage deviation of the bus after the alternating current fault according to the matched alternating current line fault mode;
calculating the power flow transfer rate of an important section after the fault, the maximum power angle difference of a generator after the fault, the maximum voltage deviation of a bus after the fault, the transient extreme value frequency of a system after the fault and the quasi-steady-state frequency of the system after the fault according to the matched direct-current line fault mode;
and carrying out three-phase short-circuit current verification on the buses to obtain the short-circuit current of each three-phase bus.
7. The method for evaluating the adaptability of the multi-direct-current-transmission-end power grid planning scheme as claimed in claim 6, wherein the calculation process of the N-1 passing rate specifically comprises the following steps:
wherein alpha represents the passing rate of the equipment power flow N-1; n is a radical ofpThe method has the advantages that the power loss load can be recovered to supply power through the switch operation after the same voltage class and the same type of elements have single faults, and the total number of safety conditions of the system without element overload during normal and continuous power supply of users is ensured; n is a radical oftThe total number of elements of the same voltage class and the same type is represented;
the calculation process of the maximum power angle difference of the generator after the fault is specifically as follows:
δ＝max|δi-δj|
wherein, deltai、δjRespectively showing the power angles of the ith and jth generators after the fault.
8. The multi-direct-current-sending-end power grid planning scheme adaptability evaluation system is characterized by comprising the following steps:
the model construction module is used for constructing an adaptability evaluation parameter model of the multi-direct-current transmission end power grid;
the network information calculation module is used for acquiring network basic information of the target planning scheme and calculating to obtain a first parameter in the system strength adaptability parameters according to the network basic information;
the power flow calculation module is used for selecting the operation mode information in the target planning scheme to carry out power flow calculation to obtain a second parameter in the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability parameter;
the simulation module is used for performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safety and stability adaptability parameter;
the evaluation module is used for comprehensively evaluating the economic development adaptability parameters, the energy structure adaptability parameters, the system strength adaptability parameters and the safety and stability adaptability parameters through the adaptability evaluation parameter model to obtain an adaptability evaluation result;
the system strength adaptability parameter consists of a first parameter and a second parameter;
the calculation process of the first parameter is as follows: acquiring associated information of a direct current line and a hydropower channel in a network, and calculating to obtain a direct current matching line power supply capacity ratio and a hydropower channel power supply capacity ratio according to the associated information; acquiring system startup and shutdown information under different operation modes, and calculating to obtain system equivalent inertia under different operation modes according to the system startup and shutdown information;
the calculation process of the second parameter is as follows: obtaining a typical operation mode in the operation mode information, and carrying out load flow calculation to obtain a multi-direct-current sending short circuit ratio and an important section load flow rate;
the calculation process of the power supply capacity ratio of the direct current matching line specifically comprises the following steps:
wherein R isdIndicating dc supplyElectric energy power proportioning; sl,iExpressed as the maximum transmission capacity of the 500kV line connected to the dc converter station; m represents the number of 500kV lines connected with the direct current converter station; sdRepresenting rated transmission capacity of the direct current converter station;
the calculation process of the hydropower channel power supply capacity ratio is specifically as follows:
wherein R iswRepresenting the proportion of the power supply capacity of the hydropower channel; sw,iExpressed as the maximum capacity of delivery of the hydroelectric channel outlet; m is the number of hydroelectric channel lines; sp,jRepresenting the capacity of the hydroelectric generating set; n is the total number of water installations on the channel;
the calculation process of the equivalent inertia of the system specifically comprises the following steps:
wherein HsRepresenting the equivalent inertia of the system; h isJRepresenting the inertia time constant of the unit; s. theNRepresenting a rated capacity of the generator set;
the calculation process of the multi-direct-current sending short-circuit ratio specifically comprises the following steps:
wherein S isaciThe short-circuit capacity of the ith return direct-current line rectifying side bus is represented; pdi、PdjRespectively representing the active power transmitted by the ith and jth return direct current lines; delta Ui、ΔUjRespectively showing voltage variation of a rectifying side bus i and a rectifying side bus j after the rectifying side bus i is put into a small-capacity three-phase symmetrical reactor or capacitor; miIndicating the multi-DC sending short-circuit ratio corresponding to the ith return DC line;
the important section tidal current load rate is the ratio of the actual active power flow to the rated active power flow on the section; the higher the load rate of the section tide is, the closer the line on the section is to the transmission limit.
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