CN112508338A - New energy station grid-connected performance comprehensive evaluation system and evaluation method thereof - Google Patents
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Abstract
The invention provides a new energy station grid-connected performance comprehensive evaluation system, belonging to the technical field of power grids, the system comprises a power grid operation data interface for transmitting power grid operation data to a complex power grid working condition simulation module, a new energy station model parameter identification and verification module for performing model verification by using test data, a power grid complex working condition simulation module for developing complex power grid simulation, a power grid regional operation risk judgment module for judging operation risks, a new energy station grouping module for dividing new energy station groups, a support vector machine module for dynamically modeling new energy station grid-connected performance indexes, an index correction module for correcting new energy station grid-connected performance evaluation indexes, a new energy station comprehensive evaluation module for evaluating grid-connected new energy stations, and a new energy station evaluation result display and output module for displaying and outputting evaluation results. In addition, the invention also provides a method for operating the system.
Description
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a new energy station grid-connected performance comprehensive evaluation system and an evaluation method thereof.
Background
The access of large-scale new energy power generation brings challenges to the operation of a power grid, and the test and evaluation of the grid-connected performance of a new energy station before grid connection are important means for guaranteeing the safe and stable operation of the power grid. Due to the limitation of capacity and technology, only tests and field tests can be carried out on the inverter or the power generation unit at the present stage, and the grid connection performance of the new energy power station needs to be solved by means of simulation.
On the other hand, the basis of the evaluation of the grid-connected performance of the new energy station comes from various publicly-published standards, such as GB/T19963 technical Specification for accessing the wind power station into the power system and GB/T19964 technical Specification for accessing the photovoltaic power station into the power system.
However, the establishment of relevant indexes of the new energy power generation grid-connected standard needs to have higher universality and certain timeliness, has no pertinence, and cannot accurately express the actual requirements of different regional power grids on new energy stations. For a power grid dispatching department, the same evaluation index is adopted for all new energy stations in the whole regional power grid, so that the evaluation result does not have reference value, and sometimes even misleading can be carried out on dispatching personnel.
Meanwhile, the development speeds of new energy resources in different areas are different, and the power grid net rack strength degrees of different areas can also be different greatly, so that the requirements for grid connection performance evaluation of new energy station stations at different geographical positions and different time stages are different.
In order to scientifically and comprehensively evaluate the new energy of the new energy station grid-connected new energy, a reasonable index system needs to be established to evaluate the new energy station in different areas.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a new energy station grid-connected performance comprehensive evaluation system; another object of the present invention is to provide an evaluation method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a new energy station grid-connected performance comprehensive evaluation system comprises:
power grid operation data interface: transmitting the power grid operation data to a power grid complex condition simulation module;
the new energy station model parameter identification and verification module comprises: the method comprises the steps of using test data of key equipment of the new energy station as input, identifying parameters of a new energy station model, automatically checking the accuracy of the established new energy station model, and outputting information of the established new energy station model to a power grid complex condition simulation module;
the power grid complex condition simulation module: according to the output of the power grid operation data interface and the new energy station model parameter identification and verification module, simulation is carried out on the complex working condition of the power grid by selecting the set power grid fault, and the result is output to the power grid regional operation risk judgment module;
the power grid regional operation risk judgment module: according to the received power grid complex condition simulation result and the national standard, judging the regional safety risk of the power grid, and outputting the result to a new energy station grouping module;
the new energy station grouping module: according to the received result of the regional operation risk judgment of the power grid, the power grid is automatically divided into regions, new energy stations in the regions are numbered, the operation and test data of the new energy stations are automatically imported into a database, the grouping result is output to a support vector machine module, and meanwhile, data and information interaction support is provided for a grid-connected index performance comprehensive evaluation module;
a support vector machine module: according to the received new energy station grouping module output result, automatically classifying and sequencing new energy station grid-connected quantization indexes in the national standard; according to the received output result of the power grid regional operation risk judgment module, weighting the new energy station grid-connected performance indexes of each region;
an index correction module: carrying out manual correction or self-adaptive correction on the received output result of the support vector machine module, and outputting the result to a grid-connected performance index comprehensive evaluation module;
the grid-connected performance index comprehensive evaluation module comprises: comprehensively evaluating the grid-connected performance of the new energy station according to the received operation and test data of the new energy station and corresponding evaluation indexes, and outputting an evaluation result to an evaluation result output and display module;
an evaluation result output and display module: and displaying the evaluation result of the new energy station, and supporting the user to self-define export of the evaluation result.
Further, the new energy station model parameter identification and verification module establishes a new energy station model framework according to an NB/T31066 wind turbine generator electrical simulation model modeling guide rule and a GB/T32826 photovoltaic power generation system modeling guide rule, identifies model parameters based on test data input, and automatically corrects the accuracy of the model.
Furthermore, the power grid complex condition simulation module constructs a simulation system by reading the information of a power grid net rack, a new energy station, a traditional power supply and a load model from the output data information of the power grid operation data interface and the new energy station model parameter identification and verification module according to user self definition or automatically; and performing electromechanical transient simulation on the running condition of the power grid by selecting the set power grid fault by user definition or automatically.
Furthermore, the regional operation risk of the power grid is judged by setting criteria according to the requirements of stable indexes of voltage, frequency and power angle of the power system in the national standard GB38755 power system safety and stability guide rule, and by scanning the output result of the complex working condition simulation module of the power grid, the regional operation risk of the power grid is identified.
Furthermore, the new energy station grouping module identifies key sections of the power grid according to the received result of the regional operation risk judgment of the power grid, divides different power grid regions in a section cutting mode, and numbers and stores test data of new energy stations in the regions according to the region division result of the power grid.
Further, the support vector machine module outputs a power grid operation state sample (M) according to the new energy station grouping module and the power grid regional operation risk judgment modulei，Ni) Establishing normalized linear classification surfaces
ωTM+b＝0 (I)
Wherein M isiThe power grid is in the ith power grid running state and generally comprises key power supply output, key node voltage, key line tide, power grid frequency/voltage/power angle stability information; n is a radical ofiThe sign of whether the section is a key section or not in the power grid running state is shown, omega is a characteristic distance, and b is a sequencing variable; according to classification interval
To a maximum, the following optimization problem is established:
further, the index correction module supports two modes, one is a user-defined mode, and the other is an index adaptive correction mode.
Furthermore, the index correction module is used for solving the formula (II) in a self-adaptive correction mode, during the solving process, the constraint term is relaxed, and meanwhile, a punishment term is added, wherein the formula (II) is corrected to be
In the formula, xi is a relaxation factor,
is a penalty item; in order to ensure the solving effect of the formula (III) under the nonlinear data, a kernel function is introduced in the solving process.
Further, the grid-connected performance index comprehensive evaluation module: and solving the model established by the support vector machine module corrected by the index correction module, comprehensively evaluating the grid-connected performance of the new energy station and outputting the result to an evaluation result output and display module.
Furthermore, the evaluation method of the new energy field station grid-connected performance comprehensive evaluation system takes the issued new energy station grid-connected quantitative index as a basis, adopts the actual operation data and simulation result of the new energy station and the power grid, calculates the operation risk of the regional power grid, and comprehensively evaluates the new energy station grid-connected performance by establishing a support vector machine model;
further, the evaluation method of the new energy station grid-connected performance comprehensive evaluation system comprises the following steps:
step 1: establishing an electromechanical transient simulation model of the new energy station according to the test data of the key equipment of the new energy station;
step 2: according to the power grid operation data and the established new energy station model, establishing a regional power grid electromechanical transient simulation model containing large-scale new energy power generation;
and step 3: simulating the complex operation condition of the power grid by setting a typical fault, judging the operation risk of the power grid according to the national standard, and determining the key section of the regional power grid;
and 4, step 4: dividing power grid regions according to the key sections of the regional power grid, and grouping the new energy station and storing test data according to the division of the regions;
and 5: establishing a new energy station comprehensive evaluation index support vector machine model suitable for the complex power grid working condition according to the division of the power grid region and the operation risk condition of the power grid in each region;
step 6: correcting the support vector machine model through a user-defined or self-adaptive correction mode; a default adaptive correction mode;
and 7: and the operation and test data of the grouped new energy stations are used as input, and the comprehensive evaluation and sequencing of the grid-connected performance of the new energy stations are realized by solving the support vector machine model, and are output and displayed.
Compared with the prior art, the invention has the beneficial effects that:
1) the universality of related quantitative indexes in the release standard can be considered, and the operation risk of the regional power grid can be considered;
2) the simulation and the measured data are combined to construct the complex power grid working condition which needs to be adapted to the grid-connected operation of the new energy station, so that the bottleneck that only test evaluation can be carried out on a generator set or a unit at the present stage due to the limitation of capacity and technology is overcome;
3) on the basis of the operation data of the new energy station and the regional power grid, the timeliness of the grid-connected performance evaluation index of the new energy station can be guaranteed through rolling simulation analysis, the operation of a power system containing new energy power generation is scientifically guided, and the safe and stable operation of the regional power grid is guaranteed;
4) the sequencing and the correction of the new energy station grid-connected performance evaluation indexes are completed by establishing a support vector machine model, and the method has the characteristics of speed block calculation, high classification accuracy and strong generalization capability, and is simple in program design and easy to implement;
5) the basis of establishing the new energy power station grid-connected performance evaluation index is the public national standard and the judgment result of the regional operation risk of the power grid, so that the actual requirement of safe and stable operation of the power grid can be met, the actual appeal of the operation of the power station can be fully considered, and the coordinated operation of the source network can be effectively supported.
Drawings
Fig. 1 is a schematic diagram of a comprehensive evaluation system for grid-connected performance of a new energy station.
Detailed Description
The technical scheme of the comprehensive evaluation system and the comprehensive evaluation method for the grid-connected performance of the new energy station will be clearly and completely described below with reference to the embodiment and the accompanying drawings. Fig. 1 shows a schematic diagram of a comprehensive evaluation scheme of grid-connected performance of a new energy station.
A new energy station grid-connected performance comprehensive evaluation system comprises a power grid operation data interface, a new energy station model parameter identification and verification module, a power grid complex condition simulation module, a power grid regional operation risk judgment module, a new energy station grouping module, a support vector machine module, an index correction module, a new energy station comprehensive evaluation module and an evaluation result display and output module; the method specifically comprises the following steps:
power grid operation data interface: transmitting the power grid operation data to a power grid complex condition simulation module;
the new energy station model parameter identification and verification module comprises: the method comprises the steps that test data of key equipment of the new energy station are used as input, model parameters of the new energy station are identified, and a result is output to a power grid complex working condition simulation module;
the power grid complex condition simulation module: automatically simulating the complex working condition of the power grid by selecting the set power grid fault, and outputting the result to a power grid regional operation risk judgment module;
the power grid regional operation risk judgment module: according to the national standard, the regional security risk of the power grid is judged, and the result is output to a new energy station grouping module;
the new energy station grouping module: according to the received result of the regional operation risk judgment of the power grid, dividing the power grid into regions, numbering the new energy stations in each divided region, automatically importing the operation and test data of the new energy stations into a database, outputting the grouping result to a support vector machine module, and providing data and information interaction support for a grid-connected index performance comprehensive evaluation module;
a support vector machine module: automatically classifying and sequencing new energy station grid-connected quantitative indexes in the national standard, and weighting new energy station grid-connected performance indexes of each region according to the received output result of the power grid regional operation risk judgment module;
an index correction module: providing two modes of user self-definition and index self-adaptive correction, correcting the received output result of the support vector machine module, and outputting the result to the grid-connected performance index comprehensive evaluation module;
the grid-connected performance index comprehensive evaluation module comprises: comprehensively evaluating the grid-connected performance of the new energy station according to the received operation and test data of the new energy station and corresponding evaluation indexes, and outputting an evaluation result to an evaluation result output and display module;
an evaluation result output and display module: and displaying the evaluation result of the new energy station, and supporting the user to self-define export of the evaluation result.
A user establishes an accurate new energy station equivalent model according to new energy station key equipment test data and a published new energy power generation modeling standard NB/T31066 'wind turbine generator set electrical simulation model modeling guide rule' and GB/T32826 'photovoltaic power generation system modeling guide rule'; and establishing a regional power grid electromechanical transient simulation model according to the power grid operation data, wherein the parameters of the simulation model can be identified and corrected on line through the power grid operation data. The power grid model is established according to relevant requirements, such as DL755 electric power system safety and stability guide rules and GB/T26399 electric power system safety and stability control technology guide rules.
The method is characterized in that faults are set at key nodes of a power grid, multi-working-condition operation conditions of the regional power grid are simulated, and the basis of fault setting and risk judgment is GB38755 electric power system safety and stability guide rule, DL755 electric power system safety and stability guide rule, GB/T26399 electric power system safety and stability control technology guide rule, GB/T31464 electric power grid operation criterion, GB/T19963 technical specification for accessing a wind power plant into an electric power system and GB/T19964 technical specification for accessing a photovoltaic power station into the electric power system. The method comprises the steps of determining a key section of the power grid through judging regional operation risks of the power grid, and then performing regional division on the power grid according to the key section.
According to the division of the power grid region, numbering the operation and test data of the new energy station in the divided region, and writing the new energy station into a database in a classified manner; meanwhile, according to GB38755 electric power system safety and stability guide rules, DL755 electric power system safety and stability guide rules, GB/T26399 electric power system safety and stability control technical guide rules and GB/T31464 electric network operation criteria, grid connection performance indexes in national standard GB/T19963 technical specification of wind power plant access electric power system and GB/T19964 technical specification of photovoltaic power plant access electric power system are weighted, and a normalized linear classification surface is established according to electric network operation state samples (Mi, Ni) output by a new energy field station grouping module and an electric network regional operation risk judgment module
ωTM+b＝0 (I)
Wherein M isiThe power grid is in the ith power grid running state and generally comprises key power supply output, key node voltage, key line tide, power grid frequency/voltage/power angle stability information; n is a radical ofiThe sign of whether the section is a key section or not in the power grid running state is shown, omega is a characteristic distance, and b is a sequencing variable;
according to classification interval
To a maximum, the following optimization problem is established:
the comprehensive evaluation of the grid-connected performance of the new energy station is to solve the formula (II), wherein in the solving process, a constraint item needs to be loosened, and a punishment item needs to be added. For this reason, the formula (II) can be modified to
Where xi is the relaxation factor, yiFor a matrix of correction coefficients, X, for the vibration amplitude of the support vector machine parametersiIs the amplitude of the variable to the support vector machine variable;
is a penalty term, wherein C is a penalty coefficient, and i is the number of new energy stations (1, 2, 3, … …, n).
In order to ensure the solving effect of the formula (III) under the nonlinear data, a kernel function can be considered in the solving process. Before solving, the user can select a custom or system self-adaptive mode to correct the index according to the requirement.
The new energy station grid-connected performance comprehensive evaluation system can also sequence the new energy stations according to the evaluation result and aiming at the requirements of power grid operation and power grid dispatching departments. After the formula (III) is solved, the variable omega is the corresponding sequencing basis.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all 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.
Claims (10)
1. The utility model provides a new forms of energy field station performance integrated evaluation system that is incorporated into power networks which characterized in that, this system includes:
power grid operation data interface: transmitting the power grid operation data to a power grid complex condition simulation module;
the new energy station model parameter identification and verification module comprises: the method comprises the steps of using test data of key equipment of the new energy station as input, identifying parameters of a new energy station model, automatically checking the accuracy of the established new energy station model, and outputting information of the established new energy station model to a power grid complex condition simulation module;
the power grid complex condition simulation module: according to the output of the power grid operation data interface and the new energy station model parameter identification and verification module, simulation is carried out on the complex working condition of the power grid by selecting the set power grid fault, and the result is output to the power grid regional operation risk judgment module;
the power grid regional operation risk judgment module: according to the received power grid complex condition simulation result and the national standard, judging the regional safety risk of the power grid, and outputting the result to a new energy station grouping module;
the new energy station grouping module: according to the received result of the regional operation risk judgment of the power grid, the power grid is automatically divided into regions, new energy stations in the regions are numbered, the operation and test data of the new energy stations are automatically imported into a database, the grouping result is output to a support vector machine module, and meanwhile, data and information interaction support is provided for a grid-connected index performance comprehensive evaluation module;
a support vector machine module: according to the received new energy station grouping module output result, automatically classifying and sequencing new energy station grid-connected quantization indexes in the national standard; according to the received output result of the power grid regional operation risk judgment module, weighting the new energy station grid-connected performance indexes of each region;
an index correction module: carrying out manual correction or self-adaptive correction on the received output result of the support vector machine module, and outputting the result to a grid-connected performance index comprehensive evaluation module;
the grid-connected performance index comprehensive evaluation module comprises: comprehensively evaluating the grid-connected performance of the new energy station according to the received operation and test data of the new energy station and corresponding evaluation indexes, and outputting an evaluation result to an evaluation result output and display module;
an evaluation result output and display module: and displaying the evaluation result of the new energy station, and supporting the user to self-define export of the evaluation result.
2. The comprehensive evaluation system for the grid-connected performance of the new energy station as claimed in claim 1, wherein the new energy station model parameter identification and verification module identifies model parameters based on test data input by establishing a new energy station model framework, and automatically corrects the accuracy of the model.
3. The system for comprehensively evaluating the grid-connected performance of the new energy station according to claim 1, wherein the power grid complex condition simulation module constructs a simulation system by reading information of a power grid network frame, the new energy station, a traditional power supply and a load model from output data information of a power grid operation data interface and a new energy station model parameter identification and verification module according to user definition or automatically; and performing electromechanical transient simulation on the running condition of the power grid by selecting the set power grid fault by user definition or automatically.
4. The system for comprehensively evaluating the grid-connected performance of the new energy station according to claim 1, characterized in that the regional operation risk of the power grid is judged by setting criteria according to the voltage, frequency and power angle stability index requirements of the power system and identifying the regional operation risk of the power grid by scanning the output result of the complex working condition simulation module of the power grid; the new energy station grouping module identifies key sections of the power grid according to the received result of the regional operation risk judgment of the power grid, divides different power grid regions in a section cutting mode, and numbers and stores test data of new energy stations in the regions according to the region division result of the power grid.
5. The system according to claim 1, wherein the support vector machine module is configured to perform comprehensive evaluation on the grid-connection performance of the new energy station according to the grid operation state samples, M, output by the new energy station grouping module and the grid regional operation risk determination modulei，NiEstablishing normalized linear classification surface
ωTM+b＝0 (I)
Wherein M isiThe power grid is in the ith power grid running state and generally comprises key power supply output, key node voltage, key line tide, power grid frequency/voltage/power angle stability information; n is a radical ofiThe sign of whether the section is a key section or not in the power grid running state is shown, omega is a characteristic distance, and b is a sequencing variable; according to classification interval
Maximum, is established asThe following optimization problem:
6. the comprehensive evaluation system for the grid-connected performance of the new energy field station as claimed in claim 1, wherein the index correction module supports two modes, one is a user-defined mode, and the other is an index adaptive correction mode.
7. The system according to claim 1, wherein the index correction module is adapted to solve the formula (II) in a correction mode, and during the solution, the constraint term is relaxed and a penalty term is added, and after the formula (II) is corrected, the formula (II) is
In the formula, xi is a relaxation factor,
is a penalty item; in order to ensure the solving effect of the formula (III) under the nonlinear data, a kernel function is introduced in the solving process.
8. The system according to claim 1, characterized in that the grid-connection performance index comprehensive evaluation module: and solving the model established by the support vector machine module corrected by the index correction module, comprehensively evaluating the grid-connected performance of the new energy station and outputting the result to an evaluation result output and display module.
9. The evaluation method of the new energy field station grid-connected performance comprehensive evaluation system as claimed in any one of claims 1 to 8, characterized in that the new energy field station grid-connected performance is comprehensively evaluated by establishing a support vector machine model by taking issued new energy power station grid-connected quantitative indexes, adopting new energy power station and grid actual operation data and simulation results, taking regional grid operation risks into consideration.
10. The evaluation method of the new energy station grid-connected performance comprehensive evaluation system according to claim 9, characterized by comprising the following steps:
step 1: establishing an electromechanical transient simulation model of the new energy station according to the test data of the key equipment of the new energy station;
step 2: according to the power grid operation data and the established new energy station model, establishing a regional power grid electromechanical transient simulation model containing large-scale new energy power generation;
and step 3: simulating the complex operation condition of the power grid by setting a typical fault, judging the operation risk of the power grid according to the national standard, and determining the key section of the regional power grid;
and 4, step 4: dividing power grid regions according to the key sections of the regional power grid, and grouping the new energy station and storing test data according to the division of the regions;
and 5: establishing a new energy station comprehensive evaluation index support vector machine model suitable for the complex power grid working condition according to the division of the power grid region and the operation risk condition of the power grid in each region;
step 6: correcting the support vector machine model through a user-defined or self-adaptive correction mode; a default adaptive correction mode;
and 7: and the operation and test data of the grouped new energy stations are used as input, and the comprehensive evaluation and sequencing of the grid-connected performance of the new energy stations are realized by solving the support vector machine model, and are output and displayed.
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