CN107133870B - Electric power spot transaction security check method based on 30-second period static analysis - Google Patents
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Abstract
The invention relates to a 30-second period static analysis-based electric power spot transaction security check method, which comprises the steps of firstly, receiving spot transaction data sent by an electric power transaction department by an electric power regulation and control center, carrying out online security analysis data preparation, then carrying out static security analysis by the regulation and control center, and finally, giving an online stability control check result and an auxiliary service strategy of the transaction center by the regulation and control center. The online safety analysis capability of the power grid can be improved, the rapid change of the electric power spot transaction can be effectively coped with, the safe and stable operation guarantee is provided for the development of the electric power market in China, and the coordination and unification of the safe operation of the power grid and the ordered operation of the market are realized.
Description
Technical Field
The invention belongs to the field of intelligent power grid dispatching, and mainly relates to a power spot transaction safety checking method based on 30-second period static analysis.
Background
In the 'twelve-five' period, the national power grid is basically built by taking a 'three-vertical three-horizontal' extra-high voltage power grid as a backbone grid frame, and is an alternating current-direct current parallel-serial large power grid which has the highest voltage level, the largest transmission capacity, the most advanced technical level and the most complex operation characteristics in the world. With the advance of the construction of an extra-high voltage power grid, the application of a large number of power electronic components such as direct current transmission, FACTS and the like, and the large-scale access of wind power and photovoltaic new energy power supplies, the operation pressure caused by the fact that the operation pressure is continuously increased, the safety and stability level is mutually restricted, and the contradiction between the resource optimization utilization and the safety problem is prominent. The traditional method for arranging the operation of the power grid is more and more difficult to adapt to the operation requirement of a future extra-high voltage large power grid, the increasingly complex and changeable operation regulation and the sudden increase of the workload of the arrangement of the power grid operation mode. During the thirteen-five period, cross-district spot transaction of electric power is comprehensively expanded, in order to relieve the problems of water abandonment, wind abandonment, light abandonment and the like, the national power grid sets up a rich renewable energy cross-district spot market rule, and cross-district transaction guided by economic benefits directly causes sudden changes of a receiving end starting mode, trend, static state and transient state stability of the power grid. The cross-provincial intra-day transaction needs to meet the security constraints of a transmitting-receiving end power grid and a cross-provincial passage, the market is clear, the security constraint conditions of the power grid need to be considered in a closed loop mode, therefore, a power dispatching mechanism needs to practically fulfill transaction security check responsibility, implement a transaction plan seriously, guarantee real-time balance and system security, before a transaction scheme is implemented, a power grid dispatching department needs to carry out security check and give an auxiliary service decision, other conditions such as power grid blockage and out-of-limit and the auxiliary service decision are timely returned to a transaction center after the security check, and the transaction center modifies transaction contents according to the suggestions of the dispatching department to complete a transaction process.
This patent improves to the online safety analysis function of D5000 perfects, carries out the electric power spot cargo transaction safety check based on the static safety analysis of 30 seconds period. The online safety analysis capability of the power grid can be improved, the rapid change of the electric power spot transaction can be effectively coped with, the safe and stable operation guarantee is provided for the development of the electric power market in China, and the coordination and unification of the safe operation of the power grid and the ordered operation of the market are realized.
Disclosure of Invention
The purpose of the invention is as follows:
the invention improves the D5000 online safety analysis function, provides a power spot transaction safety check method based on 30-second period static analysis, not only improves the online safety analysis capability of the power grid, but also effectively deals with the rapid change of the power spot transaction, provides safe and stable operation guarantee for the development of the power market in China, and realizes the coordination and unification of the safe operation of the power grid and the ordered operation of the market.
The technical scheme is as follows:
a30-second period static analysis-based electric power spot transaction security check method includes the steps that firstly, an electric power regulation and control center receives spot transaction data sent by an electric power transaction department and performs online security analysis data preparation, then the regulation and control center performs static security analysis, and finally the regulation and control center gives an online stability control check result and an auxiliary service strategy of the transaction center.
The electric power spot transaction security check method based on the 30-second period static analysis specifically comprises the following steps:
(1) the control center receives the spot transaction data
The market is opened every day in spot-shipment trading days across provinces, renewable energy source increment trading is organized in days, 15 minutes is a time period, the time period is divided into five trading sections of 0:15-8:00,8:15-12:00,12:15-16:00,16:15-20:00 and 20:15-24:00 all day, and the market is opened 2 hours before each trading section; in 17:00 days before, a sending provincial dispatching desk organizes provincial renewable energy power generation enterprises to report market bidding prices in the next day, five transaction sections are provided, and the renewable energy power generation enterprises respectively report a single price in each transaction section; the receiving provincial dispatching desk declares daily market bidding prices within the next day, five transaction sections are provided, the renewable energy power generation enterprise respectively declares a single price in each transaction section, and all price information is sealed and stored in the national dispatching center transaction platform;
150 minutes before formal transaction, the national dispatching center verifies that the electricity purchasing price difference of the receiving end and the available transmission capacity of the trans-regional channel are close to the transaction section, and when the electricity purchasing price declared by the receiving end province dispatching is lower than the electricity selling price declared by the sending end province dispatching or the trans-regional channel has no available transmission capacity, the close transaction section does not open the market; 120 minutes before the formal transaction, if the market is opened near the transaction section, the national dispatching center and the branch center issue trans-regional and trans-provincial channel available transmission capacity to the provincial dispatching center; the renewable energy power generation enterprises declare power generation curves of adjacent transaction sections in the day according to the residual power generation capacity in the transaction time period; at the moment, the provincial dispatching D5000 system receives data information such as cross-district available transmission capacity, cross-provincial channel available transmission capacity, power generation curves and quotations issued by national dispatching;
(2) static on-line security check data preparation
In order to realize the automatic use and splicing of online calculation data of different scheduling centers, firstly, the automatic mapping of equipment names and attributes thereof needs to be established; the basic principle is as follows: dynamically forming various equipment mapping tables according to online/offline equipment names, connection relations, numbers, element parameters and manually customized information, supporting many-to-many mapping and supporting mapping among different types of equipment;
under the current power system operation mode, the multi-source data mainly comprises offline data and online data; the online calculation data mainly comprise the power grid structure, equipment parameters and operation information of the power system main network, and can relatively accurately describe the operation state of the power system main network at a certain time; the off-line data comprises a relatively complete typical power grid structure and data of models and parameters of power grid equipment, and is suitable for analyzing the physical characteristics of the power grid in detail and deeply; the online calculation data and the offline data of the power grid are descriptions of the same power system, but due to different carriers and purposes of modeling, relatively independent modeling process and the like, two sets of data describing the power system from different angles are formed;
according to the actual situation and the law of the power grid, the adopted method of the dynamic intelligent mapping strategy is as follows:
1) dynamic equipment mapping with a plant station as a basic mapping unit;
2) the method comprises the following steps of realizing dynamic mapping by adopting a technology named as a core by a standard of a plant station and equipment; the method mainly comprises the steps of dynamically mapping factory station names and equipment names; refer to the following rules:
the plant names are the same or similar; the current online is mainly named by scheduling, and the offline data is named by using a mode;
the serial numbers of the equipment names are the same or similar; the equipment numbers of the scheduling name and the offline name are basically consistent;
the equipment is adjacent to the mapped equipment for dynamic mapping; for the equipment which cannot confirm mapping through the serial number, intelligent matching is carried out through the mapped equipment;
mapping by impedance ratio; for the double-circuit line mapping, because the double-circuit line mapping cannot be accurately mapped, comparison and confirmation are required to be carried out through the damping ratio of an online and offline data source;
3) realizing the complex mapping of equivalent equipment and an equivalent network according to the equivalent attributes of the contact equipment and the equipment; because the offline data is inconsistent with the online computing data modeling, in some cases, the online computing data is not modeled yet; in other cases, the actual system has a plant station which is put into operation in advance, the online calculation data has detailed plant station modeling, and the offline data is relatively simple; under the condition that the online/offline data are inconsistent, a complex mapping relation needs to be established, and accurate and complete representation of online measurement of equivalent equipment and an equivalent power grid in the integrated power flow can be ensured;
(3) static security analysis
Determining whether or not cutting certain elements endangers the safety of the system according to given grid structures, parameters and operating conditions of the generator and load elements and a given cutting scheme;
the main functions of static security analysis include:
n-1 calculation of the whole network, a certain area network or a certain voltage class network and calculation of a specified cutting scheme can be selected;
given the information of the cutting plan, one plan is a certain element in an alternating current line, a transformer, a generator or a load, or any combination of a plurality of elements therein;
based on the load flow calculation, the basic data of the load flow calculation comprises all data based on the load flow and partial data of the generator and a speed regulator thereof;
the content and form of the result output are various; not only can respectively output a plurality of information of each cutting scheme, but also can carry out statistical output in various forms on all the cutting schemes;
the calculation method supports a PQ decomposition method, a Newton method, an optimal multiplier method, a Newton method and a PQ decomposition-to-Newton method;
the static safety analysis calculation is optimized in the aspect of a power flow algorithm, and the optimization method comprises the following steps:
local correction technology of the factor table:
when the structure or parameters of the power network are locally changed, reestablishing the network equation and solving the network equation are low in efficiency, and only the changed part is calculated by adopting a network equation correction solution, so that the speed can be greatly increased;
dynamic network wiring analysis technique
The branch circuit is cut off or put into and the topological structure of the power grid is changed, so that the number of the electric islands is possibly changed, and the range of power redistribution is correspondingly changed; a network wiring analysis method is required for a practical static security analysis system;
when the wiring analysis is carried out on the changed network, the calculation time is reduced by limiting the analysis range, meanwhile, the wiring analysis result before the change is fully utilized in the analysis, and the dynamic network wiring analysis is carried out only on the changed part of the power grid after the fault by utilizing the topological main table and the auxiliary table established under the ground state tide flow, so that the wiring analysis speed can be greatly improved.
(4) On-line checking stability control strategy
The method mainly realizes the checking of the strategy of the stability control device, the system automatically collects the running state, information and EMS real-time data of the safety device, generates a real-time power grid stability calculation data file, an expected fault set and a device fault action stability card, and performs the scanning calculation of the whole network fault by using a static stability analysis program; if a certain fault triggers the device to act, the device is brought into action logic to carry out power grid stability calculation, and the action behavior of the device and the thermal stability level of the power grid after the action are given; if the device correctly acts, the power grid still has an unstable condition, the strategy of the stability control device may have problems, and whether the stability control strategy meets the requirement of the power grid stability in a real-time mode needs to be analyzed, so that the adaptability of the self-installation device strategy serving as a second defense line of the power grid is comprehensively analyzed.
The method for the online checking of the stability control strategy comprises the following steps:
and step one, loading the operation data of the power system and recording the equipment state quantity related to the stability control strategy.
Step two, traversing the entries in the stability control strategy index table, and determining whether four types of conditions contained in the entries are met one by one according to the operation data; according to the uniqueness principle of the stability control strategy, once all the four types of conditions are met, the matching is successful, no further search is needed, and the process goes to the third step;
the principle of uniqueness of the stability control strategy is that when a certain fault occurs in the determined running state of the power system, the stability control system has only one group of stability control actions matched with the stability control system and comprises a no-action strategy;
step three, according to the matching result of the step two, if a matching strategy is not found, mismatch occurs, and early warning needs to be carried out in time; if a matching strategy is found, adding the corresponding stability control action into the transient stability simulation, and if the system is unstable, giving out early warning information;
(5) assisted service decision
The auxiliary service decision is to judge whether fault constraint, mode constraint and power flow constraint conditions are met or not according to the established security control strategy model and the security control online check result and by combining the current power grid actual operation condition aiming at all security control systems and all security control strategies, if the conditions are met, the control strategies, the execution strategies and the control measures are analyzed, the control quantity is distributed until all the control measures meeting the control requirements are obtained, and the action decision suggestion of the security control device under the expected fault is set under the current power grid operation condition.
The advantages and effects are as follows:
the electric power spot transaction safety check method based on 30-second period static analysis has the following advantages and beneficial effects:
according to the invention, the D5000 online security analysis function is improved, and the electric power spot transaction security check based on 30-second period static security analysis is carried out. The online safety analysis capability of the provincial power grid can be improved, the cross-regional spot transaction of electric power with water and wind and light abandonment in a new situation can be effectively dealt with, the reliable sending-out and reliable receiving-in of the power grid can be reasonably checked and audited, the safe and stable operation guarantee is provided for the development of the power market in China, and the coordination and unification of the safe operation of the power grid and the ordered operation of the market are realized.
Drawings
FIG. 1 is a dynamic device name map.
FIG. 2 is a multi-source data map.
FIG. 3 is a schematic diagram of security control strategy checking.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
d5000 is a new generation of intelligent power grid dispatching technology support system basic platform, meets the requirements of a five-level dispatching control system in a 'large operation' system of a national power grid company, and realizes the functions of 'remote retrieval, alarm direct transmission, transverse communication and longitudinal management'. The D5000 system integrates various data such as a scheduling plan, an incoming water condition and meteorological change, integrates scattered data into a large database, and can comprehensively analyze a power grid.
The invention provides an electric power spot transaction security check method based on 30-second period static analysis, which comprises the steps that firstly, an electric power regulation and control center receives spot transaction data sent by an electric power transaction department and performs online security analysis data preparation, then the regulation and control center performs static security analysis, and finally the regulation and control center gives an online stability control check result and an auxiliary service strategy of the transaction center.
The electric power spot transaction security check method based on the 30-second period static analysis specifically comprises the following steps:
(1) the control center receives the spot transaction data
The market is opened every day in spot trading days across provinces, incremental trading of renewable energy sources in days is organized, five trading sections (15 minutes is a time period) are organized in the whole day, wherein the five trading sections are 0:15-8:00,8:15-12:00,12:15-16:00,16:15-20:00 and 20:15-24:00, and the market is opened 2 hours before each trading section. In 17:00 days before, a sending provincial dispatching desk organizes the provincial renewable energy power generation enterprises to report market competitive prices in the next day (five transaction sections, the renewable energy power generation enterprises respectively report a single price in each transaction section); the receiving provincial dispatching desk declares daily market bidding prices (five trading sections, and a single price is respectively reported by renewable energy power generation enterprises in each trading section) in the next day, and all price information is sealed and stored in the national dispatching central trading platform.
And (3) the national dispatching center verifies the price difference of the electricity purchasing price of the receiving end and the available transmission capacity of the cross-regional channel near the transaction section 150 minutes before the formal transaction, and when the electricity purchasing price declared by the provincial dispatching of the receiving end is lower than the price of the electricity selling declared by the provincial dispatching of the sending end or the cross-regional channel has no available transmission capacity, the near transaction section does not open the market. 120 minutes before the formal transaction, if the market is opened near the transaction section, the national dispatching center and the branch center issue trans-regional and trans-provincial channel available transmission capacity to the provincial dispatching center; and the renewable energy power generation enterprises declare power generation curves of adjacent transaction sections in the day according to the residual power generation capacity in the transaction time period. At the moment, the provincial dispatching D5000 system receives data information such as cross-district available transmission capacity, cross-provincial channel available transmission capacity, power generation curves and quotations issued by national dispatching;
(2) static on-line security check data preparation
In order to realize the automatic use and splicing of online computing data of different dispatching centers, automatic mapping of device names and attributes thereof needs to be established first. The basic principle is as follows: dynamically forming various equipment mapping tables according to information such as online/offline equipment names, connection relations, numbers, element parameters, manual customization and the like, supporting many-to-many mapping and mapping between different types of equipment;
for a large trans-regional power grid, due to the fact that the data involving range is wide, the data size is large, the corresponding relation is complex, and the problem of dynamic mapping of power grid equipment is difficult to solve by adopting a traditional manual maintenance method; according to the actual situation and the law of a power grid, the following principle and method are adopted to realize the dynamic intelligent mapping of the power grid equipment;
1) dynamic equipment mapping with a plant station as a basic mapping unit; in the power grid calculation data, the plant stations are positioned in the middle layer of the power grid hierarchical structure, the number of the plant stations is relatively limited, and the plant station mapping among different data is relatively easy to maintain; meanwhile, after the plant station mapping is formed, the formation of the power grid equipment mapping inside/outside the plant is greatly simplified;
2) the method comprises the following steps of realizing dynamic mapping by adopting a technology named as a core by a standard of a plant station and equipment;
3) realizing the complex mapping of equivalent equipment and an equivalent network according to equivalent attributes of contact equipment (lines or transformers) and equipment; because the off-line data is inconsistent with the on-line calculation data modeling, under some conditions, the on-line calculation data only has the equivalent measurement of the station outgoing line; in other cases, the actual system has a plant station which is put into operation in advance, the online calculation data has detailed plant station modeling, and the offline data is relatively simple; under the condition that the online/offline data are inconsistent, a complex mapping relation needs to be established, and accurate and complete representation of online measurement of equivalent equipment and an equivalent power grid in the integrated power flow can be ensured; the mapping relation is shown in FIG. 1;
under the current power system operation mode, the multi-source data mainly comprises offline data and online data; the online calculation data mainly comprise the power grid structure, equipment parameters and operation information of the power system main network, and can relatively accurately describe the operation state of the power system main network at a certain time; the off-line data comprises a relatively complete typical power grid structure and data of models and parameters of power grid equipment, and can be suitable for analyzing the physical characteristics of the power grid in detail and deeply; it can be seen that the online calculation data and the offline data of the power grid are descriptions of the same power system, but due to different modeling carriers and purposes, relatively independent modeling processes and other reasons, two sets of data describing the power system from different angles are formed;
according to the actual situation and the law of a power grid, a basic method of a dynamic intelligent mapping strategy is provided:
1) dynamic equipment mapping with a plant station as a basic mapping unit; in the power grid calculation data, the plant stations are positioned in the middle layer of the power grid hierarchical structure, the number of the plant stations is relatively limited, and the plant station mapping among different data is relatively easy to maintain; meanwhile, after the plant station mapping is formed, the formation of the power grid equipment mapping inside/outside the plant is greatly simplified;
2) the method comprises the following steps of realizing dynamic mapping by adopting a technology named as a core by a standard of a plant station and equipment; the method mainly comprises the steps of carrying out dynamic mapping on a station name, an equipment name and the like; refer to the following rules:
the plant names are the same or similar. Currently, scheduling naming is mainly used on line, and off-line data naming is used, and two plant stations are basically similar to each other in two data naming formats, for example, a scheduling name is national tone, a power plant on the left of three gorges, and an off-line name is three gorges, left of three gorges.
The device name numbers are the same or similar. The numbers of the devices (generators, three windings and the like) with the scheduling names and the off-line names are basically consistent, for example, a power plant No. 1 of the left bank of the three gorges and a power plant No. 1 of the left gorges in the Hubei province;
the equipment is adjacent to the mapped equipment for dynamic mapping; for the equipment which cannot confirm mapping through the serial number, intelligent matching is carried out through the mapped equipment;
mapping by impedance ratio; for the double-circuit line mapping, because the double-circuit line mapping cannot be accurately mapped, comparison and confirmation are required to be carried out through the damping ratio of an online and offline data source;
3) realizing the complex mapping of equivalent equipment and an equivalent network according to equivalent attributes of contact equipment (lines or transformers) and equipment; because the offline data is inconsistent with the online computing data modeling, in some cases, the online computing data is not modeled yet; in other cases, the actual system has a plant station which is put into operation in advance, the online calculation data has detailed plant station modeling, and the offline data is relatively simple; under the condition that the online/offline data are inconsistent, a complex mapping relation needs to be established, and accurate and complete representation of online measurement of equivalent equipment and an equivalent power grid in the integrated power flow can be ensured; the multi-source data mapping is shown in FIG. 2;
(3) static security analysis
Static safety analysis is to determine whether to cut off certain elements endanger the safety of the system (i.e. whether all bus voltages in the system are within the allowed range, the output of all generators in the system are within the allowed range, all lines, transformers in the system are overloaded, etc.) according to the given grid structure, parameters and operating conditions of the elements such as generators, loads, etc. and a given cutting scheme;
the main functions of static security analysis include:
n-1 calculation of the whole network, a certain area network or a certain voltage class network and calculation of a specified cutting scheme can be selected;
the cutting scheme information is given simply, conveniently and flexibly, one scheme can be a certain element in an alternating current line, a transformer, a generator or a load, and can also be any combination of a plurality of elements;
based on the load flow calculation, the basic data of the load flow calculation comprises all data based on the load flow and partial data of the generator and a speed regulator thereof;
the content and form of the result output are various; the method can not only output various information (such as out-of-limit information of various physical quantities) of each cutting scheme respectively, but also output various forms of statistics (such as output according to a physical quantity, a range, a bus, an alternating current line or a transformer) on all cutting schemes;
the calculation method supports PQ decomposition method, Newton method (power formula), optimal multiplier method (nonlinear programming method), Newton method (current formula), PQ decomposition-to-Newton method, and the like;
compared with the traditional static safety analysis, the static safety analysis calculation in the invention is optimized in the aspect of load flow algorithm, and mainly embodied in the following two key technologies:
local correction technique for factor table.
When the structure or parameters of the power network are locally changed, the network equation is reestablished and solved inefficiently, and only the changed part is calculated by adopting the network equation correction solution, so that the speed can be greatly improved. One of the commonly used correction methods is a compensation method, and the other is a factor table correction algorithm. The factor table correction algorithm includes rank factor correction and local factor re-decomposition. The factor table correction algorithm is particularly suitable for permanent occasions when the network changes, such as power flow analysis after faults. The factor table correction algorithm can utilize sparse vector technology, so the calculation amount is quite small. For the condition that the factor table needs to be applied for a plurality of times after the network change, a new factor table can be obtained by the factor table correction algorithm. When the network change causes the order change of the network equation, a corresponding processing method is provided, and the technology speed can be greatly improved by utilizing the sparse vector technology, so that the method can be suitable for static safety analysis under complex faults.
Dynamic network wiring analysis technique
The branch circuit is cut off or put into and the topological structure of the power grid changes, so that the number of the electric islands can change, and the range of power redistribution also changes correspondingly. Network wiring analysis is therefore essential to a practical static security analysis system.
With the enlargement of the scale of the power grid, the number of faults needing to be processed by one-time static safety analysis is huge, and the times of corresponding network wiring analysis are increased. Reducing the time spent in this portion is increasingly important to increase the overall speed of static security analysis. Common network connection analysis methods can be classified into 2 categories: 1) a method based on adjacency and squaring matrices; 2) the method based on the graph search comprises depth priority and breadth priority. The method of class 1 is slow and not suitable for static security analysis; the method of class 2 has developed a local topology method for performing topology analysis only for a part of the power grid including the changed part. When the wiring analysis is carried out on the changed network, the calculation time is reduced by limiting the analysis range, meanwhile, the wiring analysis result before the change is fully utilized in the analysis, and the dynamic network wiring analysis is carried out only on the changed part of the power grid after the fault by utilizing the topological main table and the auxiliary table established under the ground state tide flow, so that the wiring analysis speed can be greatly improved.
(4) On-line checking stability control strategy
The function mainly realizes the checking of the stability control device strategy, the system automatically acquires the running state, information and EMS real-time data of the safety device, generates a real-time power grid stability calculation data file, an expected fault set and a device fault action stability card, and performs the scanning calculation of the whole network faults by using a static stability analysis program. If a certain fault triggers the device to act, the device action logic is incorporated into the device to carry out power grid stability calculation, and the action behavior of the device and the thermal stability level of the power grid after the action are given. If the device correctly acts, the power grid still has an unstable condition, the strategy of the stability control device may have problems, and whether the stability control strategy meets the requirement of the power grid stability in a real-time mode needs to be analyzed, so that the adaptability of the self-installation device strategy serving as a second defense line of the power grid is comprehensively analyzed.
The stability control strategy online checking method mainly comprises the following steps:
and step one, loading the operation data of the power system and recording the equipment state quantity related to the stability control strategy.
And step two, traversing the entries in the stability control strategy index table, and determining whether the four types of conditions contained in the entries are met one by one according to the operating data. According to the uniqueness principle of the stability control strategy, once all the four types of conditions are met, the matching is successful, no further search is needed, and the process goes to the third step.
And the principle of uniqueness of the stability control strategy is that when a certain fault occurs in the determined running state of the power system, the stability control system has and only has one group of stability control actions (including no-action strategies) matched with the stability control system.
Step three, according to the matching result of the step two, if a matching strategy is not found, mismatch occurs, and early warning needs to be carried out in time; if a matching strategy is found, adding the corresponding stability control action into the transient stability simulation, and if the system is unstable, giving out early warning information. The safety control strategy checking principle is shown in FIG. 3.
(5) Assisted service decision
The auxiliary service decision is to judge whether constraint conditions such as fault constraint, mode constraint and power flow constraint are met or not according to the established security control strategy model and the security control online check result and by combining the current power grid actual operation condition aiming at all security control systems and all security control strategies, if the constraint conditions are met, the analysis of the control strategy, the execution strategy and the control measure and the distribution of the control quantity are carried out until all the control measures meeting the control requirement are obtained, and the action decision suggestion of the security control device under the expected fault is given under the current power grid operation condition.
Claims (3)
1. The electric power spot transaction security check method based on 30-second period static analysis is characterized by comprising the following steps: firstly, an electric power regulation and control center receives spot transaction data sent by an electric power transaction department and prepares online safety analysis data, then the regulation and control center carries out static safety analysis, and finally the regulation and control center gives an online stability control check result and an auxiliary service strategy of the transaction center;
wherein, the static security analysis specifically comprises:
preparing static online safety check data:
in order to realize the automatic use and splicing of online calculation data of different scheduling centers, firstly, the automatic mapping of equipment names and attributes thereof needs to be established; the basic principle is as follows: dynamically forming various equipment mapping tables according to online/offline equipment names, connection relations, numbers, element parameters and manually customized information, supporting many-to-many mapping and supporting mapping among different types of equipment;
under the current power system operation mode, the multi-source data mainly comprises offline data and online data; the online calculation data mainly comprise the power grid structure, equipment parameters and operation information of the power system main network, and can relatively accurately describe the operation state of the power system main network at a certain time; the off-line data comprises a relatively complete typical power grid structure and data of models and parameters of power grid equipment, and is suitable for analyzing the physical characteristics of the power grid in detail and deeply; the online calculation data and the offline data of the power grid are descriptions of the same power system, but due to different carriers and purposes of modeling, relatively independent modeling process and the like, two sets of data describing the power system from different angles are formed;
according to the actual situation and the law of the power grid, the adopted method of the dynamic intelligent mapping strategy is as follows:
1) dynamic equipment mapping with a plant station as a basic mapping unit;
2) the method comprises the following steps of realizing dynamic mapping by adopting a technology named as a core by a standard of a plant station and equipment; the method mainly comprises the steps of dynamically mapping factory station names and equipment names; refer to the following rules:
the plant names are the same or similar; the current online is mainly named by scheduling, and the offline data is named by using a mode;
the serial numbers of the equipment names are the same or similar; the equipment numbers of the scheduling name and the offline name are basically consistent;
the equipment is adjacent to the mapped equipment for dynamic mapping; for the equipment which cannot confirm mapping through the serial number, intelligent matching is carried out through the mapped equipment;
mapping by impedance ratio; for the double-circuit line mapping, because the double-circuit line mapping cannot be accurately mapped, comparison and confirmation are required to be carried out through the damping ratio of an online and offline data source;
3) realizing the complex mapping of equivalent equipment and an equivalent network according to the equivalent attributes of the contact equipment and the equipment; because the offline data is inconsistent with the online computing data modeling, in some cases, the online computing data is not modeled yet; in other cases, the actual system has a plant station which is put into operation in advance, the online calculation data has detailed plant station modeling, and the offline data is relatively simple; under the condition that the online/offline data are inconsistent, a complex mapping relation needs to be established, and accurate and complete representation of the online measurement of equivalent equipment and an equivalent power grid in the integrated power flow can be guaranteed.
2. The method for electric power spot transaction security check based on 30-second period static analysis according to claim 1, wherein: the method comprises the following specific steps:
step (1) is performed before the static online security check data is prepared,
(1) the control center receives the spot transaction data
The market is opened every day in spot-shipment trading days across provinces, renewable energy source increment trading is organized in days, 15 minutes is a time period, the time period is divided into five trading sections of 0:15-8:00,8:15-12:00,12:15-16:00,16:15-20:00 and 20:15-24:00 all day, and the market is opened 2 hours before each trading section; in 17:00 days before, a sending provincial dispatching desk organizes provincial renewable energy power generation enterprises to report market bidding prices in the next day, five transaction sections are provided, and the renewable energy power generation enterprises respectively report a single price in each transaction section; the receiving provincial dispatching desk declares daily market bidding prices within the next day, five transaction sections are provided, the renewable energy power generation enterprise respectively declares a single price in each transaction section, and all price information is sealed and stored in the national dispatching center transaction platform;
150 minutes before formal transaction, the national dispatching center verifies that the electricity purchasing price difference of the receiving end and the available transmission capacity of the trans-regional channel are close to the transaction section, and when the electricity purchasing price declared by the receiving end province dispatching is lower than the electricity selling price declared by the sending end province dispatching or the trans-regional channel has no available transmission capacity, the close transaction section does not open the market; 120 minutes before the formal transaction, if the market is opened near the transaction section, the national dispatching center and the branch center issue trans-regional and trans-provincial channel available transmission capacity to the provincial dispatching center; the renewable energy power generation enterprises declare power generation curves of adjacent transaction sections in the day according to the residual power generation capacity in the transaction time period; at the moment, the provincial dispatching D5000 system receives data information such as cross-district available transmission capacity, cross-provincial channel available transmission capacity, power generation curves and quotations issued by national dispatching;
step (3) is performed after the static online security check data preparation,
(3) static security analysis
Determining whether or not cutting certain elements endangers the safety of the system according to given grid structures, parameters and operating conditions of the generator and load elements and a given cutting scheme;
the main functions of static security analysis include:
n-1 calculation of the whole network, a certain area network or a certain voltage class network and calculation of a specified cutting scheme can be selected;
given the information of the cutting plan, one plan is a certain element in an alternating current line, a transformer, a generator or a load, or any combination of a plurality of elements therein;
based on the load flow calculation, the basic data of the load flow calculation comprises all data based on the load flow and partial data of the generator and a speed regulator thereof;
the content and form of the result output are various; not only can respectively output a plurality of information of each cutting scheme, but also can carry out statistical output in various forms on all the cutting schemes;
the calculation method supports a PQ decomposition method, a Newton method, an optimal multiplier method, a Newton method and a PQ decomposition-to-Newton method;
the static safety analysis calculation is optimized in the aspect of a power flow algorithm, and the optimization method comprises the following steps:
local correction technology of the factor table:
when the structure or parameters of the power network are locally changed, reestablishing the network equation and solving the network equation are low in efficiency, and only the changed part is calculated by adopting a network equation correction solution, so that the speed can be greatly increased;
dynamic network wiring analysis technique
The branch circuit is cut off or put into and the topological structure of the power grid is changed, so that the number of the electric islands is possibly changed, and the range of power redistribution is correspondingly changed; a network wiring analysis method is required for a practical static security analysis system;
when the wiring analysis is carried out on the changed network, the calculation time is reduced by limiting the analysis range, meanwhile, the wiring analysis result before the change is fully utilized in the analysis, and the dynamic network wiring analysis is carried out only on the changed part of the power grid after the fault by utilizing the topological main table and the auxiliary table established under the ground state tide flow, so that the wiring analysis speed can be greatly improved;
(4) on-line checking stability control strategy
The method mainly realizes the checking of the strategy of the stability control device, the system automatically collects the running state, information and EMS real-time data of the safety device, generates a real-time power grid stability calculation data file, an expected fault set and a device fault action stability card, and performs the scanning calculation of the whole network fault by using a static stability analysis program; if a certain fault triggers the device to act, the device is brought into action logic to carry out power grid stability calculation, and the action behavior of the device and the thermal stability level of the power grid after the action are given; if the device correctly acts and the power grid still has an unstable condition, the strategy of the stability control device may have problems, and whether the stability control strategy meets the requirement of the power grid stability in a real-time mode needs to be analyzed, so that the adaptability of the strategy of the self-installation device serving as a second defense line of the power grid is comprehensively analyzed;
(5) assisted service decision
The auxiliary service decision is to judge whether fault constraint, mode constraint and power flow constraint conditions are met or not according to the established security control strategy model and the security control online check result and by combining the current power grid actual operation condition aiming at all security control systems and all security control strategies, if the conditions are met, the control strategies, the execution strategies and the control measures are analyzed, the control quantity is distributed until all the control measures meeting the control requirements are obtained, and the action decision suggestion of the security control device under the expected fault is set under the current power grid operation condition.
3. The method for electric power spot transaction security check based on 30-second period static analysis according to claim 2, wherein: in the step (4), the stability control strategy online checking method comprises the following steps:
loading operation data of a power system, and recording equipment state quantity related to a stability control strategy;
step two, traversing the entries in the stability control strategy index table, and determining whether four types of conditions contained in the entries are met one by one according to the operation data; according to the uniqueness principle of the stability control strategy, once all the four types of conditions are met, the matching is successful, no further search is needed, and the process goes to the third step;
the principle of uniqueness of the stability control strategy is that when a certain fault occurs in the determined running state of the power system, the stability control system has only one group of stability control actions matched with the stability control system and comprises a no-action strategy;
step three, according to the matching result of the step two, if a matching strategy is not found, mismatch occurs, and early warning needs to be carried out in time; if a matching strategy is found, adding the corresponding stability control action into the transient stability simulation, and if the system is unstable, giving out early warning information.
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