CN110350513B - Online strategy fixed value checking method for safety and stability control system - Google Patents
Online strategy fixed value checking method for safety and stability control system Download PDFInfo
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- CN110350513B CN110350513B CN201910473108.5A CN201910473108A CN110350513B CN 110350513 B CN110350513 B CN 110350513B CN 201910473108 A CN201910473108 A CN 201910473108A CN 110350513 B CN110350513 B CN 110350513B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
An online strategy fixed value checking method of a safety and stability control system is characterized in that an offline strategy is formulated by an operator in a considered operation mode, but when certain extreme operation modes occur in an actual power grid, the offline strategy is invalid; the offline strategy is formulated based on certain specific faults, if the power grid has certain multiple successive faults, the strategy table is mismatched, and the power grid is at risk of instability; the off-line strategy is not an optimal fixed value for some operation modes, and over-cut can be caused in actual operation, so that the economic performance is poor; the offline strategy making work is complex, and workers are required to have a rich experience in the processes of analysis, summarization and classification, so that the offline strategy making work faces a great challenge. The method checks the online strategy fixed value for many times from different aspects, improves the reliability of the stability control system for using the online strategy fixed value, and provides technical guarantee for safe and stable operation of the power grid.
Description
Technical Field
The invention belongs to the field of power system automation, and particularly relates to an online strategy fixed value checking method of a safety and stability control system.
Background
The safe and stable control system is a second defense line for guaranteeing safe and stable operation of the power grid, and a control strategy is formulated for some expected faults in a certain operation mode, so that the effective and reliable safe and stable control strategy is the core of the safe and stable control system and is also the guarantee of safe and stable operation of the power grid.
The safety and stability control strategy comprises four types of information including an operation mode, a fault mode, a tide mode and a control measure, and a strategy table with clear logic and easy reading and understanding is formed in a specific format, so that programming of program developers is facilitated. At present, an offline control strategy established in an offline mode is mostly adopted in a control strategy widely used at home and abroad, a mode calculator or a parallel computer performs fault scanning according to an expected fault type under a possible running mode of a research power grid to obtain measures for keeping the power grid safe and stable, and then the calculation results are analyzed, summarized, classified and arranged into a strategy table, and a programmer writes the strategy table into a safe and stable control system. When a certain fault occurs in the power grid, if the offline control strategy of the stable control system is matched with the power grid operation mode, the fault mode and the power flow mode, the stable control system acts to cut off the units or loads, otherwise, the stable control system does not act.
Offline strategies have mainly the following problems:
(1) The offline strategy is formulated by an operator in a considered operation mode, but when certain extreme operation modes of the actual power grid occur, the offline stable control strategy can be invalid;
(2) The offline strategy is formulated based on certain specific faults, if the power grid has certain multiple successive faults, the strategy table is mismatched, and the power grid is at risk of instability;
(3) The off-line strategy is not an optimal fixed value for some operation modes, and over-cut can be caused in actual operation, so that the economic performance is poor;
(4) The offline strategy making work is complex, and workers are required to have a rich experience in the processes of analysis, summarization and classification, so that the offline strategy making work faces a great challenge.
Based on the defects of the offline strategy, an online safe and stable control strategy matched in real time is urgently needed, the requirements of a power grid operation mode, double faults, control cost reduction and worker load reduction are met, and the online safe and stable control strategy is reliably issued to a field stable control system and used as a strategy in the next time period.
Disclosure of Invention
The invention aims to:
aiming at the demand that the on-site stability control system needs to check the effectiveness of the strategy when using the on-line strategy fixed value, the invention provides an on-line strategy fixed value checking method of a safety and stability control system, which aims to solve the following problems:
(1) The offline strategy is formulated by an operator in a considered operation mode, but when certain extreme operation modes of the actual power grid occur, the offline stable control strategy can be invalid;
(2) The offline strategy is formulated based on certain specific faults, if the power grid has certain multiple successive faults, the strategy table is mismatched, and the power grid is at risk of instability;
(3) The off-line strategy is not an optimal fixed value for some operation modes, and over-cut can be caused in actual operation, so that the economic performance is poor;
(4) The offline strategy making work is complex, and workers are required to have a rich experience in the processes of analysis, summarization and classification, so that the offline strategy making work faces a great challenge.
The method of the invention checks the online strategy fixed value of the stability control system for a plurality of times from different aspects, thereby ensuring that the online strategy fixed value received by the stability control system is accurate and effective.
The technical scheme is as follows:
the invention adopts the following technical scheme:
an online strategy fixed value checking method of a safety and stability control system comprises the following steps:
(1) Triggering the online strategy fixed value of the dispatching end, and generating an online strategy fixed value list required by the safety and stability control system;
(2) Checking the online strategy fixed value list generated by calculation by the scheduling end, and determining whether to issue the checked online strategy fixed value list to the safety and stability control system or not and checking the information of the power grid analog quantity collected by the scheduling end, wherein the information checked by the safety and stability control system to the scheduling end;
(3) The scheduling end receives the online strategy fixed value list checked by the safety and stability control system and checks whether the online strategy fixed value list sent by the safety and stability control system is consistent with the fixed value list stored in the buffer zone, so as to generate a new online strategy fixed value list;
(4) Checking whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range, and determining whether to update the newly generated online strategy fixed value list and the checked online strategy fixed value.
(1) Triggering the online strategy fixed value of the scheduling end by the following two modes of a safety and stability control system in the step: after the accident triggering or the period triggering, the online strategy fixed value checking system of the dispatching end calculates corresponding online control strategy fixed values aiming at expected faults or fault sets in a new operation mode formed by the accident triggering or the period triggering, and generates an online strategy fixed value list required by the safety and stability control system.
(2) The method comprises the following steps:
(2.1) checking and calculating whether the format and unit of the online strategy fixed value list generated in the step (1) are completely matched with the format and unit of the fixed value list sent by the stability control, if so, entering the step (2.2); if not, returning to the step (1);
(2.2) the scheduling end online strategy fixed value checking system calculates whether the absolute error between the generated online strategy fixed value and the offline strategy fixed value in the current operation mode is in an allowable range or not, if so, the step (2.3) is carried out; if not, returning to the step (1);
(2.3) the dispatching end transmits the checked online strategy fixed value table and the power grid analog quantity collected by the dispatching end to the safety and stability control system;
(2.4) the dispatching end sends information downwards to the safety and stability control system, and the dispatching end is used for checking whether the relative error between the power grid analog quantity under the dispatching end and the power grid analog quantity collected by the safety and stability control system is within an allowable range or not by the safety and stability control system, if so, the step (3) is carried out; if not, returning to the step (1);
(3) The method comprises the following steps:
(3.1) receiving an online strategy fixed value list checked by the safety and stability control system by the dispatching end;
(3.2) checking whether an online strategy fixed value list sent by the safety and stability control system is consistent with a fixed value list stored in a buffer area or not by a dispatching end, if so, entering a step (3.3); if not, returning to the step (1);
and (3.3) calculating an online strategy control strategy by the online strategy fixed value checking system of the dispatching end again according to the expected faults or fault sets of the current operation mode, and generating a new fixed value list.
(4) The method comprises the following steps:
(4.1) checking (3.3) whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range or not at the dispatching end, if so, entering the step (4.3); if not, returning to the step (1);
and (4.2) the dispatching end sends an update strategy instruction to the safety and stability control system.
The following two steps are performed before step (1) is entered into step (2):
firstly, judging whether a communication channel between a dispatching end and a safety and stability control system is normal, if so, entering a step (II); if not, returning to the step (1);
checking the validity of the state quantity sent by the safety and stability control system at the dispatching end, judging whether the safety and stability control system is normal or not, and if yes, entering the step (2); if not, returning to the step (1).
And (4.2) returning to the step (1) after the step (4.2).
In the second step, the security and stability control system uploading state quantity checked at the dispatching end comprises system abnormality, on-line strategy state and strategy starting.
The accident triggering is the element exit accident; the periodic trigger is measured by taking time as an index, namely, the time interval of the online fixed value calculation of two adjacent times is 10 s-180 s.
When the online strategy fixed value checking method is applied to power transmission network stability control, in the step (2.4), when checking relative errors of power transmission network analog quantity parameters issued by a dispatching end and analog quantity parameters acquired by a safety stability control system at the same place and at the same moment, safety stability characteristics of power transmission networks under different faults are mastered, and some analog quantities capable of reflecting the safety stability characteristics of the power transmission networks under the faults are selected as main checking parameters, and some electric analog quantities relatively weaker in reflecting the stability characteristics of the power transmission networks are selected as secondary checking parameters; the relative error set value of the primary checking parameter is less than 2%, and the relative error set value of the secondary checking parameter is less than 10%.
The system comprises a scheduling end online strategy fixed value triggering module, an online strategy fixed value single check module, a new online strategy fixed value single generation module and an error check module;
the online policy fixed value triggering module triggers the online policy fixed value of the scheduling end and generates an online policy fixed value list required by the safety and stability control system;
the online strategy fixed value list checking module checks the online strategy fixed value list generated by the online strategy fixed value triggering module, determines whether to issue the checked online strategy fixed value list to the safety and stability control system and the power grid analog quantity information collected by the dispatching end, and checks the issued information determined by the safety and stability control system to the dispatching end;
the new online strategy fixed value list generation module receives the online strategy fixed value list checked by the safety and stability control system in the online strategy fixed value list checking module, checks whether the online fixed value list sent by the stability control is consistent with the fixed value list stored in the buffer zone, and generates a new online strategy fixed value list;
and the error checking module checks whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range or not, and decides whether to update the online strategy fixed value list to the checked online strategy fixed value or not.
The advantages and effects are that:
in order to ensure that the stability control system can accurately and reliably receive the online strategy issued by the scheduling end, the communication between the scheduling end and the stability control system is realized, and the online strategy fixed value is checked for many times from different aspects, otherwise, the stability control system adopts the offline strategy fixed value. The method of the application checks the online strategy fixed value at the dispatching end and the stability control system end respectively, ensures that the online strategy fixed value list generated by the communication channel and the dispatching end and the online strategy fixed value list received by the stability control system are accurate and effective, and finally sends the online strategy fixed value list checked by the stability control system to the dispatching end and checks the consistency of the online strategy fixed value list and the fixed value list calculated by the dispatching end again. In the checking process, if a certain condition is not met, the stability control system adopts an offline strategy to fix a value; only when all conditions are satisfied, the stability control system adopts an online strategy fixed value.
In conclusion, the method checks the online strategy fixed value for many times from different aspects, improves the reliability of the stability control system in using the online strategy fixed value, and provides technical guarantee for safe and stable operation of the power grid.
Drawings
FIG. 1 is a schematic diagram of an online policy constant value calculation, generation and check system consisting of a scheduling end and a stability control system;
FIG. 2 is a flow chart of verification of online policy values for a stability control system.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The method is used for checking and updating the on-site stability control system on-line policy fixed value, checking the on-line policy fixed value at a dispatching end and a stability control system end respectively, ensuring that an on-line policy fixed value list generated by a communication channel and the dispatching end and an on-line policy fixed value list received by the stability control system are accurate and effective, and finally sending the on-line policy fixed value list checked by the stability control system to the dispatching end and checking consistency with the fixed value list calculated by the dispatching end again. In the checking process, if a certain condition is not met, the stability control system adopts an offline strategy to fix a value; only when all conditions are satisfied, the stability control system adopts an online strategy fixed value.
FIG. 1 is a schematic diagram of an online policy constant value calculation, generation and check system composed of a scheduling end and a stability control system, wherein the scheduling end calculates a control policy of an expected fault in the operation mode according to online EMS and WAMS data, and after a series of checks, the policy constant value of the stability control system is updated into an online policy constant value issued by scheduling. The communication rule in the invention is about to realize the principles of disclosure, specification, standard and the like, and preferably adopts 103 rule as national standard.
The invention is illustrated by taking a control strategy of a regional power grid for sending + -800 kV extra-high voltage direct current (rated power is 1 ten thousand MW) blocking as an embodiment, and according to an off-line strategy, when the extra-high voltage direct current is blocked, the regional power grid is high-frequency, a cutting machine control measure is needed, and cutting machine power=direct current blocking power (Pd) -reserved power (Pb=2000 MW).
As shown in fig. 2, the specific design steps of each link of the method are as follows:
(1) The stability control system adopts an offline strategy fixed value;
in the embodiment, when the extra-high voltage direct current operation is performed and a locking fault occurs, an off-line strategy is selected as a power grid switching control measure of the transmitting end region, and the reserved power in the control strategy is 2000MW.
(2) When the running mode of the power grid changes (the element exits or the power flow greatly changes) or the time interval between two adjacent online fixed value calculation is more than 10s, the online strategy fixed value calculation system of the dispatching end calculates a corresponding online control strategy fixed value aiming at an expected fault or a fault set in a new running mode, and generates a fixed value list required by the stability control system;
in the embodiment, when the regional power grid changes the operation mode of the regional power grid due to a certain reason (such as climate change or low carbon emission or other direct current not allowing modulation, etc.), the online strategy fixed value calculation system of the dispatching end calculates a new control strategy aiming at the extra-high voltage direct current blocking fault in the operation mode, the reserved power in the new control strategy is 2500MW, a fixed value list format which can be identified by the stability control device is generated, and the generated online strategy fixed value list is shown in the table below.
| Sequence number | Constant value name | Setting range | Setting value | Unit (B) |
| 1 | Reserve power | 0～10000 | 2500 | MW |
(3) Judging whether the communication channel between the scheduling end and the stability control system is normal? If yes, go to step (4); if not, returning to the step (1);
in the embodiment, the stability control system sends a heartbeat message control word (set to 1) to the dispatching center every 1s, and if the dispatching center cannot receive the heartbeat message control word for 4 times continuously (namely within 4 s), the communication channel is abnormal; if the dispatch center can continuously receive the heartbeat message control word, the communication channel is normal.
(4) Checking the validity of the state quantity (such as system abnormality, online policy state, policy start, etc.) sent by the stability control system at the scheduling end, and judging whether the stability control system is normal? If yes, go to step (5); if not, returning to the step (1);
in the embodiment, the stability control system sends a device abnormality control word to the scheduling end, and if the device abnormality control word is 1, the stability control system is abnormal; if the device abnormality control word is 0, the stability control system is normal.
(5) Check the format and unit of the online policy constant value list generated by calculation and the format and unit of the steady control upper sending constant value list at the dispatching end are completely matched? If yes, go to step (6); if not, returning to the step (1);
in an embodiment, the stability control system sends an offline fixed value list shown in the following table to the scheduling end, and the scheduling end checks whether the generated fixed value list is consistent with the sent fixed value list unit, whether the set value is within the set range, and whether the names and the number of the fixed value list are consistent?
| Sequence number | Constant value name | Setting range | Setting value | Unit (B) |
| 1 | Reserve power | 0～10000 | MW |
(6) The scheduling end online policy constant value calculation system calculates whether the absolute error between the generated online policy constant value and the offline policy constant value in the current operation mode is within the allowable range? If yes, go to step (7); if not, returning to the step (1);
in an embodiment, the reserve power error is set to 800MW, if the absolute error in the reserve power and offline policy settings is less than 800? If yes, go to step (7); if not, returning to the step (1);
(7) The dispatching end transmits the checked online strategy fixed value table and the power grid analog quantity collected by the dispatching end to the stability control system;
in an embodiment, the scheduling end transmits an online strategy fixed value list and a power grid analog quantity to the stability control system, and the power grid analog quantity is shown in the table below.
| Sequence number | Name of the name | Numerical value | Unit (B) |
| 1 | Frequency of inversion side | 49.98 | Hz |
| 2 | Polar 1 output power | 5005 | MW |
| 3 | Polar 2 output power | 5000 | MW |
| 4 | Voltage of bus on inversion side | 501 | kV |
| 5 | Wind farm collecting station 1 output power | 345 | MW |
| 6 | Output power of wind power plant collecting station 2 | 280 | MW |
| 7 | Wind farm collector 3 output power | 360 | MW |
| 8 | The hydropower station 1 sends out the output power of the line | 450 | MW |
| 9 | The hydropower station 2 sends out the output power of the line | 400 | MW |
| 10 | The hydropower station 3 sends out the output power of the line | 380 | MW |
| 11 | Output power of output line of thermal power plant 1 | 620 | MW |
| 12 | Output power of outgoing line of thermal power plant 2 | 590 | MW |
| 13 | Output power of outgoing line of thermal power plant 3 | 610 | MW |
(8) After the stability control system receives the information issued by the dispatching end, checking whether the relative error between the power generation network analog quantity under the dispatching end and the power grid analog quantity acquired by the stability control device is within the allowable range? If yes, go to step (9); if not, returning to the step (1);
in the embodiment, the frequency stability problem is mainly caused by direct current blocking, so that the frequency of a power grid, the direct current transmission power and the voltage of an inversion side bus can be used as main checking parameters, the output of a wind power plant, a hydropower station and a thermal power plant is used as secondary checking parameters, the relative error of the main checking parameters is within 2%, and the relative error of the secondary checking parameters is within 10%.
(9) The stability control system sends the checked online strategy fixed value list to the scheduling end again;
in the embodiment, the stability control system sends the checked online strategy fixed value list to the scheduling end again;
(10) In the embodiment, checking whether the online fixed value list sent on the stability control at the scheduling end is consistent with the fixed value list stored in the buffer region? If yes, go to step (11); if not, return to step (1)
(11) The online strategy fixed value calculation system of the scheduling end calculates a corresponding online strategy control strategy again according to the expected faults or fault sets of the current operation mode, and generates a new fixed value list;
in the embodiment, the scheduling end online policy constant value computing system computes the reserved power for the direct current locking fault again according to the current operation mode, and generates a new constant value list again, see the table below
| Sequence number | Constant value name | Setting range | Setting value | Unit (B) |
| 1 | Reserve power | 0～10000 | 2502 | MW |
(12) In the embodiment, checking whether the relative error between the newly generated online strategy fixed value list and the online strategy fixed value list sent by the stability control system is within the allowable range (the set relative error is less than 0.1%)? If yes, go to step (13); if not, returning to the step (1);
(13) In the embodiment, a scheduling end sends a finer strategy instruction control word 1 to a stability control system;
(14) Updating the fixed value of the stability control device into the checked on-line strategy fixed value;
(15) Returning to step (2), in an embodiment, waiting for the next online policy calculation.
In this embodiment, the system is in an offline policy constant value mode, the power grid operation mode changes, and the scheduling end automatically calculates and generates a new online policy constant value and checks the corresponding online policy constant value. If the new online strategy control strategy fixed value passes the inspection, the strategy fixed value in the stability control system is updated to the online strategy fixed value, otherwise, the offline strategy fixed value is adopted.
Correspondingly, the invention also provides an online strategy fixed value checking system of the safety and stability control system, which can execute the method of the embodiment to achieve the same effect, and comprises a scheduling end online strategy fixed value triggering module, an online strategy fixed value single checking module, a new online strategy fixed value single generating module and an error checking module;
the online policy fixed value triggering module triggers the online policy fixed value of the scheduling end and generates an online policy fixed value list required by the safety and stability control system;
the online strategy fixed value list checking module checks the online strategy fixed value list generated by the online strategy fixed value triggering module, determines whether to issue the checked online strategy fixed value list to the safety and stability control system and the power grid analog quantity information collected by the dispatching end, and checks the issued information determined by the safety and stability control system to the dispatching end;
the new online strategy fixed value list generation module receives the online strategy fixed value list checked by the safety and stability control system in the online strategy fixed value list checking module, checks whether the online fixed value list sent by the stability control is consistent with the fixed value list stored in the buffer zone, and generates a new online strategy fixed value list;
and the error checking module checks whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range or not, and decides whether to update the online strategy fixed value list to the checked online strategy fixed value or not.
The above embodiment is used for explaining that the method of the invention performs validity check on the on-line strategy fixed value received by the on-site stability control system by combining with the current operation mode through the on-line strategy fixed value check, thereby improving the reliability and accuracy of the stability control system using the on-line strategy fixed value.
Claims (7)
1. An online strategy fixed value checking method of a safety and stability control system is characterized in that: the method comprises the following steps:
(1) Triggering the online strategy fixed value of the dispatching end, and generating an online strategy fixed value list required by the safety and stability control system;
(2) Checking the online strategy fixed value list generated by calculation by the scheduling end, and determining whether to issue the checked online strategy fixed value list to the safety and stability control system or not and checking the information of the power grid analog quantity collected by the scheduling end, wherein the information checked by the safety and stability control system to the scheduling end;
(3) The scheduling end receives the online strategy fixed value list checked by the safety and stability control system and checks whether the online strategy fixed value list sent by the safety and stability control system is consistent with the fixed value list stored in the buffer zone, so as to generate a new online strategy fixed value list;
(4) Checking whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range, and determining whether to update the newly generated online strategy fixed value list and the checked online strategy fixed value;
in the step (1), the online strategy fixed value of the scheduling end is triggered by the following two modes of a safety and stability control system: after the accident triggering or the period triggering, the online strategy fixed value checking system at the dispatching end calculates corresponding online control strategy fixed values aiming at expected faults or fault sets in a new operation mode formed by the accident triggering or the period triggering, and generates an online strategy fixed value list required by the safety and stability control system;
in the step (2):
(2.1) checking and calculating whether the format and unit of the online strategy fixed value list generated in the step (1) are completely matched with the format and unit of the fixed value list sent by the stability control, if so, entering the step (2.2); if not, returning to the step (1);
(2.2) the scheduling end online strategy fixed value checking system calculates whether the absolute error between the generated online strategy fixed value and the offline strategy fixed value in the current operation mode is in an allowable range or not, if so, the step (2.3) is carried out; if not, returning to the step (1);
(2.3) the dispatching end transmits the checked online strategy fixed value table and the power grid analog quantity collected by the dispatching end to the safety and stability control system;
(2.4) the dispatching end sends information downwards to the safety and stability control system, and the dispatching end is used for checking whether the relative error between the power grid analog quantity under the dispatching end and the power grid analog quantity collected by the safety and stability control system is within an allowable range or not by the safety and stability control system, if so, the step (3) is carried out; if not, returning to the step (1);
in the step (3):
(3.1) receiving an online strategy fixed value list checked by the safety and stability control system by the dispatching end;
(3.2) checking whether an online strategy fixed value list sent by the safety and stability control system is consistent with a fixed value list stored in a buffer area or not by a dispatching end, if so, entering a step (3.3); if not, returning to the step (1);
(3.3) calculating an online strategy control strategy again by the online strategy fixed value checking system of the dispatching end according to the expected faults or fault sets of the current operation mode, and generating a new fixed value list;
in the step (4):
(4.1) checking (3.3) whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range or not at the dispatching end, if so, entering the step (4.3); if not, returning to the step (1);
and (4.2) the dispatching end sends an update strategy instruction to the safety and stability control system.
2. The method for checking the online policy setting of the safety and stability control system according to claim 1, wherein the method comprises the following steps: the following two steps are performed before step (1) is performed in step (2):
firstly, judging whether a communication channel between a dispatching end and a safety and stability control system is normal, if so, entering a step (II); if not, returning to the step (1);
checking the validity of the state quantity sent by the safety and stability control system at the dispatching end, judging whether the safety and stability control system is normal or not, and if yes, entering the step (2); if not, returning to the step (1).
3. The method for checking the online policy setting of the safety and stability control system according to claim 2, wherein the method comprises the following steps: after step (4.2), returning to step (one).
4. The method for checking the online policy setting of the safety and stability control system according to claim 2, wherein the method comprises the following steps: in the second step, the security and stability control system uploading state quantity checked at the dispatching end comprises system abnormality, on-line strategy state and strategy starting.
5. The method for checking the online policy setting of the safety and stability control system according to claim 1, wherein the method comprises the following steps: the accident triggering is the element exit accident; the periodic trigger is measured by taking time as an index, namely, the time interval of the online fixed value calculation of two adjacent times is 10 s-180 s.
6. The method for checking the online policy setting of the safety and stability control system according to claim 1, wherein the method comprises the following steps: when the online strategy fixed value checking method is applied to power transmission network stability control, in the step (2.4), when checking relative errors of power transmission network analog quantity parameters issued by a dispatching end and analog quantity parameters acquired by a safety stability control system at the same place and at the same moment, safety stability characteristics of power transmission networks under different faults are mastered, and some analog quantities capable of reflecting the safety stability characteristics of the power transmission networks under the faults are selected as main checking parameters, and some electric analog quantities relatively weaker in reflecting the stability characteristics of the power transmission networks are selected as secondary checking parameters; the relative error set value of the primary checking parameter is less than 2%, and the relative error set value of the secondary checking parameter is less than 10%.
7. A system employing the safety and stability control system on-line policy decision check method of claim 1, wherein: the system comprises a scheduling end online strategy fixed value triggering module, an online strategy fixed value single check module, a new online strategy fixed value single generation module and an error check module;
the online policy fixed value triggering module triggers the online policy fixed value of the scheduling end and generates an online policy fixed value list required by the safety and stability control system;
the online strategy fixed value list checking module checks the online strategy fixed value list generated by the online strategy fixed value triggering module, determines whether to issue the checked online strategy fixed value list to the safety and stability control system and the power grid analog quantity information collected by the dispatching end, and checks the issued information determined by the safety and stability control system to the dispatching end;
the new online strategy fixed value list generation module receives the online strategy fixed value list checked by the safety and stability control system in the online strategy fixed value list checking module, checks whether the online fixed value list sent by the stability control is consistent with the fixed value list stored in the buffer zone, and generates a new online strategy fixed value list;
and the error checking module checks whether the error of the newly generated online strategy fixed value list and the online strategy fixed value list sent by the safety and stability control system is in an allowable range or not, and decides whether to update the online strategy fixed value list to the checked online strategy fixed value or not.
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