CN111030109B - Network-constrained power grid reserve capacity deduction calculation method and related device - Google Patents
Network-constrained power grid reserve capacity deduction calculation method and related device Download PDFInfo
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Abstract
The application discloses a network constrained power grid reserve capacity deduction calculation method and a related device, wherein the method comprises the following steps: arranging all the units in an ascending order according to the sensitivity; calculating the load flow value of the network section of each unit under the first maximum adjustable output; sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value; when the total tidal current value obtained by accumulation is larger than a threshold value, stopping the accumulation of the tidal current value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain a limited unit; and accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section. The method and the device solve the technical problems that the existing research on the reserve capacity under network constraint is difficult to reduce and quantify the reserve capacity of the system, and scientific and accurate description cannot be formed, so that the method and the device cannot be well applied to the actual power grid reserve regulation optimization process.
Description
Technical Field
The application relates to the technical field of power grid reserve capacity, in particular to a network-constrained power grid reserve capacity deduction calculation method and a related device.
Background
With the gradual improvement of power grid construction, the control principle of a power system is more and more, the control requirement is higher and more, so that the limitation received by the power system is more and more, and the contradiction between the standby capacity deduction caused by the operation standby requirement of the power system and the limitation of various factors is more and more obvious, wherein the standby capacity of the power system is particularly influenced by network constraint, so that the evaluation of the standby capacity of the power system and the regulation capacity of power grid standby by calculating the reduction of the standby capacity under the network constraint are extremely important, while the existing research on the standby capacity under the network constraint is difficult to quantize the reduction of the standby capacity of the system, cannot form scientific and accurate description, and cannot be well applied to the actual regulation and optimization process of the power grid standby.
Disclosure of Invention
The application provides a network-constrained power grid reserve capacity deduction calculation method and a related device, which are used for solving the technical problem that the existing research on reserve capacity under network constraint is difficult to quantize the reserve capacity of a system in a deduction mode, and scientific and accurate description cannot be formed, so that the method cannot be well applied to the actual power grid reserve regulation and optimization process.
In view of the above, a first aspect of the present application provides a network-constrained grid reserve capacity deduction calculation method, including:
arranging all the units in an ascending order according to the sensitivity;
calculating the load flow value of the network section of each unit under the first maximum adjustable output;
comparing the tidal current value of the network section with a threshold value in sequence, and if the tidal current value is smaller than the threshold value, accumulating the tidal current value in sequence;
when the total power flow value obtained by accumulation is larger than the threshold value, stopping the power flow value accumulation, and recording the position of the last unit participating in the power flow value accumulation to obtain a limited unit, wherein the limited unit is all units behind the unit position;
and accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
Preferably, the sorting all the units in ascending order according to the sensitivity further includes:
and correcting the first maximum adjustable output of each unit according to unit faults, heat supply limitation of the cogeneration unit and water head limitation of the hydroelectric generating unit.
Preferably, the maximum adjustable output of each unit is corrected according to unit faults, heat supply limitation of the cogeneration unit and water head limitation of the hydroelectric unit, and the method further comprises the following steps:
and calculating the first maximum adjustable output of each unit of the plant station.
Preferably, the number of said network sections is at least one.
Preferably, the total tidal current value is calculated according to a preset formula, wherein the preset formula is as follows:
wherein EjThe total tidal current value of the jth network section, i is the unit number, l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
A second aspect of the present application provides a network constrained grid reserve capacity deduction calculation apparatus, comprising:
the sorting module is used for carrying out ascending sorting on all the units according to the sensitivity;
the load flow calculation module is used for calculating the load flow value of the network section of each unit under the first maximum adjustable output;
the power flow accumulation module is used for sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value;
the limited selection module is used for stopping the accumulation of the tidal current value when the total tidal current value obtained by accumulation is larger than the threshold value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain a limited unit, wherein the limited unit is all units behind the unit position;
and the limited calculation module is used for accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
Preferably, the method further comprises the following steps:
and the correction module is used for correcting the first maximum adjustable output of each unit according to unit faults, heat supply limitation of the cogeneration unit and water head limitation of the hydroelectric generating unit.
Preferably, the method further comprises the following steps:
and the preparation module is used for calculating the first maximum adjustable output of each unit of the plant station.
Preferably, the power flow accumulation module includes: a calculation module;
the calculation module is used for calculating the total tidal current value according to a preset formula, wherein the preset formula is as follows:
wherein EjThe total tidal current value of the jth network section, i is the unit number, l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
A third aspect of the present application provides a network constrained grid backup capacity deduction computing device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any of the network constrained grid reserve capacity deduction calculation methods provided in the first aspect according to instructions in the program code.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a network-constrained power grid reserve capacity deduction calculation method, which comprises the following steps: arranging all the units in an ascending order according to the sensitivity; calculating the load flow value of the network section of each unit under the first maximum adjustable output; sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value; when the total tidal current value obtained by accumulation is larger than a threshold value, stopping the accumulation of the tidal current value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain a limited unit, wherein the limited unit is all units behind the unit position; and accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
In the network-constrained power grid reserve capacity deduction calculation method provided by the application, all the units in a plant station are arranged in an ascending order according to the sensitivity of the units, the unit which is selected and calculated at first is the unit with the lowest sensitivity, the tidal current value calculation is sequentially carried out according to the order, but the tidal current value calculation of each time is carried out when the output of the unit is adjusted to be the maximum, if the tidal current value obtained under the constraint does not reach the threshold value of the network section limit, the network section is not limited, the tidal current value of the network section of the next unit can be calculated, the tidal current value and the total tidal current value are accumulated to obtain the total tidal current value, the total tidal current value does not exceed the threshold value, the tidal current calculation is carried out downwards continuously, the total tidal current value exceeds the threshold value, the limitation of the network section reaches, the unit is taken as the criterion, the following unit is the limited unit of the network section, and the maximum adjustable output of each limited unit is different from, and then accumulating the difference values of all the limited units to obtain the limited capacity of the network section, wherein the limited capacity is the reserve capacity reduction of the power system under the network constraint, and the reserve capacity reduction is quantized on a microscopic angle, so that the actual reserve capacity of the power system is evaluated, and a support is provided for optimizing a regulation scheme of the reserve of the power grid on a macroscopic angle. Therefore, the network-constrained power grid reserve capacity deduction calculation method solves the technical problem that the reserve capacity of a system is difficult to decrement and quantify in the conventional research of the reserve capacity under network constraint, and scientific and accurate description cannot be formed, so that the method cannot be well applied to the actual power grid reserve regulation and optimization process.
Drawings
Fig. 1 is a schematic flowchart of a first embodiment of a network-constrained power grid reserve capacity deduction calculation method provided in the present application;
fig. 2 is a schematic flowchart of a second embodiment of a network-constrained power grid reserve capacity deduction calculation method provided in the present application;
fig. 3 is a schematic structural diagram of an embodiment of a network-constrained grid reserve capacity deduction calculation apparatus provided in the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1, a first embodiment of a network-constrained grid reserve capacity deduction calculation method provided by the present application includes:
and 101, performing ascending arrangement on all the units according to the sensitivity.
It should be noted that all units of the plant have sensitivity coefficients, so all units can be arranged from small to large according to the sensitivity, so that the unit which is selected first and participates in the calculation is the unit with the minimum sensitivity.
And 102, calculating the tidal current value of the network section of each unit under the first maximum adjustable output.
And 103, sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value.
And step 104, when the total tidal current value obtained by accumulation is larger than a threshold value, stopping the accumulation of the tidal current value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain the limited unit.
Wherein, the limited unit is all units behind the unit position.
It should be noted that after all the units are arranged in ascending order according to the sensitivity, each unit has an original output and a maximum adjustable output, and when a tidal current value of a network section is calculated, the output of the current unit needs to be adjusted to the maximum value; calculating the tidal current value of the network section under the maximum adjustable output of the first unit from the first unit, if the tidal current value is smaller than a preset section limit value, namely a threshold value, calculating the tidal current value of the network section under the maximum adjustable output of the unit with the second smallest sequencing sensitivity, adding the tidal current value with the tidal current value obtained for the first time, comparing the threshold value, and if the tidal current value exceeds the threshold value, indicating that the network section exceeds the limit, reaching the limit, and stopping calculation; and if the current value is still smaller than the threshold value, continuing to select the set with higher sensitivity until the accumulated total current value is larger than the threshold value. And when the limit is reached, recording the units participating in the tidal current value accumulation at the moment, wherein all the units in the unit belong to the limited units according to the sequence.
And 105, accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
It should be noted that when the network section reaches the limit, it is indicated that all the units with higher sensitivity behind the limit are limited units of the network section, while the units in the previous accumulation process are units within the limit of the network section, the maximum adjustable output of each limited unit is different from the initial output, and then the difference is accumulated to obtain the limited capacity of the currently researched network section, that is, the deduction value of the reserve capacity of the power system under the network constraint.
In the network-constrained power grid reserve capacity deduction calculation method provided by the application, all the units in a plant station are arranged in an ascending order according to the sensitivity of the units, the unit which is selected and calculated at first is the unit with the lowest sensitivity, the tidal current value calculation is sequentially carried out according to the order, but the tidal current value calculation of each time is carried out when the output of the unit is adjusted to be the maximum, if the tidal current value obtained under the constraint does not reach the threshold value of the network section limit, the network section is not limited, the tidal current value of the network section of the next unit can be calculated, the tidal current value and the total tidal current value are accumulated to obtain the total tidal current value, the total tidal current value does not exceed the threshold value, the tidal current calculation is carried out downwards continuously, the total tidal current value exceeds the threshold value, the limitation of the network section reaches, the unit is taken as the criterion, the following unit is the limited unit of the network section, and the maximum adjustable output of each limited unit is different from, and then accumulating the difference values of all the limited units to obtain the limited capacity of the network section, wherein the limited capacity is the reserve capacity reduction of the power system under the network constraint, and the reserve capacity reduction is quantized on a microscopic angle, so that the actual reserve capacity of the power system is evaluated, and a support is provided for optimizing a regulation scheme of the reserve of the power grid on a macroscopic angle. Therefore, the network-constrained power grid reserve capacity deduction calculation method solves the technical problem that the reserve capacity of a system is difficult to decrement and quantify in the conventional research of the reserve capacity under network constraint, and scientific and accurate description cannot be formed, so that the method cannot be well applied to the actual power grid reserve regulation and optimization process.
For easy understanding, please refer to fig. 2, an embodiment two of a network-constrained grid reserve capacity deduction calculation method is provided in the embodiment of the present application, including:
It should be noted that the adjustable output refers to a residual power generation output value of the unit, i.e., a power generation margin, and is an important index for measuring the residual power generation capacity of the grid-connected unit, and the maximum adjustable output of all units in the plant is counted and calculated, so that subsequent calculation is facilitated.
It should be noted that the maximum adjustable output is generally obtained by a difference between the unit capacity and the real-time output, but the maximum adjustable output of the unit in practice is affected by many factors, such as unit faults, limitation of heat supply of the cogeneration unit, limitation of water head of the hydroelectric generating unit, and the like, wherein the unit faults mainly include high unit output limit and low unit output limit; under the influence of the factors, the maximum adjustable output is generally not the difference between the simple unit capacity and the real-time output, and the maximum adjustable output obtained by correcting statistics and calculating according to the factors is a process of reducing the maximum adjustable output and is also a process closest to the actual maximum adjustable output of the unit.
And step 203, performing ascending arrangement on all the units according to the sensitivity.
It should be noted that all units of the plant have sensitivity coefficients, so all units can be arranged from small to large according to the sensitivity, so that the unit which is selected first and participates in the calculation is the unit with the minimum sensitivity.
And 204, calculating the tidal current value of the network section of each unit under the first maximum adjustable output.
And step 205, sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value.
And step 206, when the total tidal current value obtained by accumulation is larger than the threshold value, stopping the accumulation of the tidal current value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain the limited unit.
Wherein, the limited unit is all units behind the unit position.
And step 207, accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
It should be noted that after all the units G are arranged in ascending order according to the sensitivity B, each unit has an original output D and a maximum adjustable output C, and when calculating the tidal current value of the network section a, the output of the current unit needs to be adjusted to the maximum value; calculating the tidal current value of the network section under the maximum adjustable output of the first unit from the first unit, if the tidal current value is smaller than a preset section limit value, namely a threshold value, calculating the tidal current value of the network section under the maximum adjustable output of the unit with the second smallest sequencing sensitivity, adding the tidal current value with the tidal current value obtained for the first time, comparing the threshold value, and if the tidal current value exceeds the threshold value, indicating that the network section exceeds the limit, reaching the limit, and stopping calculation; and if the current value is still smaller than the preset value, continuing to select the unit with higher sensitivity until the accumulated total tidal current value E is larger than the threshold value.
With A1、A2……AnRepresenting n network sections with respective threshold values of F1、F2……FmThe thresholds correspond to the network sections one by one, and the sensitivities of m units are marked as B from small to large1、B2……BmAnd the corresponding maximum adjustable output of the unit is recorded as C1、C2……CmThe unit is marked G1、G2……GmWith a network section A1For example, the total tidal current value is calculated according to a preset formula, wherein the preset formula is as follows:
wherein E is1The total tidal current value of the first network section, i is the unit number, l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
When E is1＞F1If, the current value of i is recorded, denoted by l, then Gl……GmAll units are network sections A1Limited unit, network section A1Is expressed as
The network section A obtained above1Limited capacity, networkThe number of the sections is at least one, and by the method, the limited capacity of all the network sections can be obtained when the number of the network sections is n. When the network section reaches the limit, the limited capacity indicates that all the units with higher sensitivity behind the limit are limited units of the network section, the units in the previous accumulation process are units within the limit of the network section, the maximum adjustable output and the initial output of each limited unit are different, and the difference is accumulated to obtain the limited capacity of the currently researched network section, namely the deduction value of the reserve capacity of the power system under the network constraint.
For ease of understanding, please refer to fig. 3, an embodiment of a network constrained grid reserve capacity deduction computing device is also provided herein, comprising:
the sorting module 301 is configured to sort all the units in ascending order according to the sensitivity;
the load flow calculation module 302 is used for calculating the load flow value of the network section of each unit under the first maximum adjustable output;
the power flow accumulation module 303 is configured to sequentially compare power flow values of the network section with a threshold, and if the power flow values are smaller than the threshold, sequentially accumulate the power flow values;
the limited selection module 304 is used for stopping the accumulation of the tidal current value when the total tidal current value obtained by accumulation is larger than a threshold value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain a limited unit, wherein the limited unit is all units behind the unit position;
and the limited calculation module 305 is configured to add up the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
The power flow accumulation module 303 includes a calculation module 3031, configured to calculate a total power flow value according to a preset formula, where the preset formula is:
wherein EjI is the total tidal current value of the jth network sectionNumber l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
Further, the network constrained spare capacity reduction computing device provided by the present application may further include: and the correcting module 306 is used for correcting the first maximum adjustable output of each unit according to the unit faults, the heat supply limit of the cogeneration unit and the water head limit of the hydroelectric generating unit.
Further, the network constrained spare capacity reduction computing device provided by the present application may further include: the preparation module 307 is configured to calculate a first maximum adjustable output of each unit of the plant.
To facilitate understanding, the present application provides a network constrained grid reserve capacity deduction computing device, characterized in that the device comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute any of the network constrained grid reserve capacity deduction calculation methods in the network constrained reserve capacity deduction calculation embodiment according to instructions in the program code.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A network constrained grid reserve capacity deduction calculation method is characterized by comprising the following steps:
arranging all the units in an ascending order according to the sensitivity;
calculating the load flow value of the network section of each unit under the first maximum adjustable output;
comparing the tidal current value of the network section with a threshold value in sequence, and if the tidal current value is smaller than the threshold value, accumulating the tidal current value in sequence;
when the total power flow value obtained by accumulation is larger than the threshold value, stopping the power flow value accumulation, and recording the position of the last unit participating in the power flow value accumulation to obtain a limited unit, wherein the limited unit is all units behind the unit position;
and accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
2. The network constrained grid reserve capacity deduction calculation method of claim 1, wherein the sorting of all the units in ascending order according to sensitivity further comprises:
and correcting the first maximum adjustable output of each unit according to unit faults, heat supply limitation of the cogeneration unit and water head limitation of the hydroelectric generating unit.
3. The network constrained grid reserve capacity deduction calculation method of claim 2, wherein said correcting said first maximum adjustable contribution of each unit based on unit faults, cogeneration unit heating limits, and hydro-electric unit head limits further comprises:
and calculating the first maximum adjustable output of each unit of the plant station.
4. The network constrained grid reserve capacity deduction calculation method of claim 1, wherein the number of network sections is at least one.
5. The network constrained grid reserve capacity deduction calculation method of claim 1, wherein the total tidal current value is calculated according to a preset formula, the preset formula being:
wherein EjThe total tidal current value of the jth network section, i is the unit number, l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
6. A network constrained spare capacity reduction computing device, comprising:
the sorting module is used for carrying out ascending sorting on all the units according to the sensitivity;
the load flow calculation module is used for calculating the load flow value of the network section of each unit under the first maximum adjustable output;
the power flow accumulation module is used for sequentially comparing the power flow value of the network section with a threshold value, and if the power flow value is smaller than the threshold value, sequentially accumulating the power flow value;
the limited selection module is used for stopping the accumulation of the tidal current value when the total tidal current value obtained by accumulation is larger than the threshold value, and recording the position of the last unit participating in the accumulation of the tidal current value to obtain a limited unit, wherein the limited unit is all units behind the unit position;
and the limited calculation module is used for accumulating the difference between the second maximum adjustable output of each limited unit and the original output of the limited unit to obtain the limited capacity of the network section.
7. The network constrained spare capacity reduction computing device of claim 6, further comprising:
and the correction module is used for correcting the first maximum adjustable output of each unit according to unit faults, heat supply limitation of the cogeneration unit and water head limitation of the hydroelectric generating unit.
8. The network constrained spare capacity reduction computing device of claim 6, further comprising:
and the preparation module is used for calculating the first maximum adjustable output of each unit of the plant station.
9. The network constrained reserve capacity deduction calculation device of claim 6, wherein said power flow accumulation module comprises: a calculation module;
the calculation module is used for calculating the total tidal current value according to a preset formula, wherein the preset formula is as follows:
wherein EjThe total tidal current value of the jth network section, i is the unit number, l is the unit number when the total tidal current value is greater than the threshold value, BiSensitivity of the ith unit, CiIs the maximum adjustable output of the ith unit, DiThe original output of the ith unit.
10. A network constrained spare capacity reduction computing device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the network constrained grid reserve capacity deduction calculation method of any of claims 1-5 according to instructions in the program code.
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