CN112510656A - Method and system for issuing fixed value of protection strategy of power system - Google Patents
Method and system for issuing fixed value of protection strategy of power system Download PDFInfo
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- CN112510656A CN112510656A CN202011195764.2A CN202011195764A CN112510656A CN 112510656 A CN112510656 A CN 112510656A CN 202011195764 A CN202011195764 A CN 202011195764A CN 112510656 A CN112510656 A CN 112510656A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses a method for issuing a protection strategy fixed value of an electric power system, which comprises the following steps that 1) a dispatching end acquires operation mode data (element switching, section power), a direct current control mode, a pressing plate switching state and measured information of a controllable quantity from a system protection device in real time; 2) splicing related information in the measured information obtained by the scheduling end into a real-time operation mode word, and carrying out fixed value online setting calculation according to the power grid model and measured data sent by the device to obtain an online fixed value with the operation mode word; 3) checking the online setting value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, submitting the online setting value to a setting value issuing module if the checking is passed, and returning to the step 2 if the checking is not passed; 4) the online fixed value issuing module and the plant station terminal take the effect of the online fixed value after interactive confirmation, and the reliable issuing of the system protection online strategy fixed value is realized through the triple confirmation of the comparison of the operation mode characters, the check of the online fixed value and the issuing process of the online fixed value.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to a method and a system for confirming a fixed value of a protection strategy of a power system.
Background
The system protection device has a plurality of strategy fixed values, the protection of a receiving end power grid system comprises strategy fixed values such as direct current lifting and pumping cut pump action threshold power, direct current lifting and pumping cut pump action under-cut power, interruptible load action threshold power, interruptible load action under-cut power and the like, and the fixed values on the device are generally written into the device before the system leaves a factory or is in test operation, and are manually modified in actual operation according to operation requirements. In order to ensure stable operation of a power grid, a large margin is generally considered to be reserved for a strategy fixed value set in a system protection strategy, but in some special operation scenes, due to mismatch of a power grid operation mode and an offline typical mode, a risk that a system protection action cannot ensure safe and stable operation still exists, and therefore the system protection fixed value needs to be set on line based on a power grid operation condition and an online strategy of system protection. In order to realize timely and reliable effectiveness of the online fixed value on a system protection device, a system protection online strategy fixed value automatic and reliable issuing method needs to be researched, however, the relevance of the system protection strategy fixed value modification and the operation condition of a power grid is not considered enough in the existing fixed value issuing method, and all verification work is carried out at a plant station side.
Disclosure of Invention
The invention aims to provide a method for confirming a fixed value of a protection strategy of a power system, which can verify the validity of the fixed value according to the running condition of a power grid in the process of sending the fixed value.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, a method for issuing a protection policy fixed value of an electric power system is provided, which includes:
1) real-time acquiring operation mode data (element switching and stopping, section power), a direct current control mode, a pressing plate switching state and controllable amount of measured information from a system protection device;
2) splicing the information related to the fixed value in the obtained actual measurement information into a real-time operation mode word, and carrying out online setting calculation according to the actual measurement data sent by the power grid model and the system protection device to obtain an online fixed value with the operation mode word;
3) checking the online setting value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, submitting the online setting value to a setting value issuing module if the checking is passed, and returning to the step 2 if the checking is not passed;
4) and the online fixed value issuing module and the station terminal take effect after interactive confirmation.
With reference to the first aspect, further, the obtaining of the online fixed value with the operation mode word by performing online setting calculation according to the power grid model and the measured data sent by the system protection device specifically includes:
and combining the power grid model and the measured data sent by the system protection device to generate calculation data for the on-line setting calculation of the fixed value, calculating the on-line fixed value through the calculation data, splicing the information related to the fixed value in the measured information obtained by the scheduling end at the starting moment of calculation into a real-time operation mode word, and associating the real-time operation mode word with the on-line fixed value.
With reference to the first aspect, further, the scheduling end periodically splices the measured information into an operation mode word and compares the operation mode word with an operation mode word used for checking the current online setting value, if the operation mode word and the operation mode word are not consistent, the checking of the online setting value in the step 3) is terminated, the step 2) is returned, and if the operation mode word and the operation mode word are consistent, the next cycle operation mode word comparison is started.
Combining the first aspect, further, splicing the measured information into an operation mode word, and comparing the operation mode word with an operation mode word corresponding to operation mode data used for checking the current online setting value specifically: and comparing the key section power gear, the key element on-off state and the key pressing plate on-off state (namely the section power gear, the element on-off state and the pressing plate on-off state related to constant value calculation) contained in the two operation mode words with the direct current control mode.
With reference to the first aspect, further, the checking the online fixed value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid refers to: aiming at anticipated complex and serious faults covered by a system protection device, searching corresponding system protection measures according to an online fixed value and a candidate control space, judging static overload, voltage out-of-limit and frequency safety of a power grid after the system protection measures are implemented, and checking if the static overload, the voltage out-of-limit and the frequency safety are safe.
With reference to the first aspect, further, the interactive confirmation between the online fixed value issuing module and the plant station end in step 4) specifically includes:
the scheduling end issues the operation mode words and the online fixed values to the plant station end;
the station terminal analyzes the operation mode word, checks whether the operation mode word is matched with the operation mode of the current power grid, returns the received online fixed value and the operation mode word to the dispatching terminal for confirmation if the operation mode word is matched with the operation mode word, and returns a matching failure mark if the operation mode word is not matched with the operation mode word;
the dispatching end analyzes the returned matching information, if the matching fails, the issuing process is ended, if the matching succeeds, consistency judgment is carried out on the online constant value and the operation mode word returned by the plant station end, if the online constant value and the operation mode word are consistent, the online constant value and the operation mode word are continuously issued and take effect, and if the online constant value and the operation mode word are not consistent, the current online constant value and the operation mode word corresponding to the online constant value are issued again to the plant station end;
after the plant terminal receives the online fixed value and the running mode from the dispatching terminal, the plant terminal compares the online fixed value and the running mode with the online fixed value and the running mode issued by the dispatching terminal at the previous time, if the online fixed value and the running mode are consistent, the latest received online fixed value and running mode word are updated into the internal memory of the plant terminal, the effective mark of the online fixed value in the internal memory of the plant terminal is updated to be effective, the successful mark of the effect is returned to the dispatching terminal, and if the online fixed value and the running mode word are not consistent, the effective mark of the failure of the effect is returned to the dispatching terminal;
the dispatching end receives an effective mark returned by the plant station end, and if the effective mark fails, the current online fixed value and the current operation mode word are retransmitted; if the online fixed value and the running mode word are successful, updating the online fixed value and the running mode word stored in the dispatching end, simultaneously calling the online fixed value and the running mode word of the plant station end, carrying out consistency comparison on the online fixed value and the running mode word and the online fixed value and the running mode word which are successfully issued in the previous round, if the online fixed value and the running mode word are consistent, finishing the issuing process, otherwise, returning an issuing failure mark to the plant station end, and re-issuing the online fixed value and the corresponding running mode word;
and after receiving the issuing failure mark, the station terminal updates the effective mark of the online fixed value of the station terminal to be invalid.
In a second aspect, a system for issuing a fixed value of a protection policy of an electric power system is provided, which includes:
an acquisition module: the system comprises a dispatching end, a system protection device and a control end, wherein the dispatching end is used for acquiring operation mode data, a direct current control mode, a pressing plate switching state and actual measurement information of controllable quantity from the system protection device in real time;
a constant value calculation module: the system comprises a dispatching end, a real-time operation mode word and a fixed value online setting calculation device, wherein the dispatching end is used for splicing information related to the fixed value in the obtained actually measured information of the dispatching end into the real-time operation mode word, and the fixed value online setting calculation device is used for performing fixed value online setting calculation according to a power grid model and actually measured data sent by the device to obtain an online fixed value with the operation mode word;
a fixed value checking module: the online setting value checking module is used for checking the online setting value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, and if the check fails, the online setting value checking module is used for checking the online setting value based on the setting value online setting calculation result which is re-performed by the setting value calculation module;
and the fixed value issuing module is used for interacting with the factory station end when the result of the check performed by the fixed value checking module is that the check passes, and enabling the online fixed value to take effect after the interaction confirmation.
Has the advantages that: the method realizes the automatic and reliable issuing of the online strategy fixed value of the system protection through the triple confirmation of the comparison of the operation mode words, the check of the online fixed value and the issuing process of the online fixed value, ensures the timely perception and adjustment of the online fixed value when the operation mode of the power grid changes, improves the automatic management level of the online fixed value of the system protection, and increases the reliability of the issuing confirmation of the fixed value.
Drawings
FIG. 1 is a data interaction diagram of a dispatching end and a plant station end in the present invention;
fig. 2 is a flow chart of system protection policy fixed value issuing confirmation in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The data interaction block diagram of a dispatching end where a system protection device is located and a plant station end in a fixed value issuing process is shown in figure 1, the dispatching end is composed of data acquisition, operation mode comparison, fixed value on-line setting, on-line fixed value check and on-line fixed value issuing functions, the plant station end device acquires measured data and fixed value information and sends the measured data and the fixed value information to the dispatching end, the dispatching end carries out fixed value on-line setting calculation according to the acquired data, and a result is generated and then issued to the plant station end device through on-line fixed value interaction.
The specific issuing process of the invention is shown in fig. 2, and comprises the following steps:
step 1, a dispatching end acquires operation mode data (including element switching and stopping, section power data), a direct current control mode, a pressing plate switching state and controllable amount of actual measurement information in real time from a system protection device of a station end, and the actual measurement information comprises the following table contents:
the above contents form a system protection operation mode word, and in addition, the device also needs to upload other measured data required for online setting value setting, which includes the following contents:
step 2, splicing information related to the fixed value in the measured information obtained by the scheduling end into a real-time operation mode word, and obtaining an online fixed value according to the real-time operation mode word data;
the dispatching end splices and generates real-time operation mode words according to actual measurement information (the section power, the element switching and stopping and the pressing plate state related to the fixed value in the step 1) sent by the device, the operation mode word at each moment corresponds to the operation mode data at the moment, and the calculation data used for fixed value online setting calculation is formed by combining a power grid model and the current operation mode data (including the controllable quantity and the section power sent by the device), meanwhile, the real-time operation mode word at the moment is used as the calculation operation mode word, the moment corresponding to the real-time data is used as the section moment, and the online fixed value setting module periodically carries out system protection strategy fixed value online setting calculation;
step 3, after the online fixed value checking module detects that the online fixed value is generated, the online fixed value setting result is shown in the following table, the online fixed value is checked safely and stably based on the real-time operation mode data of the power grid and the ultra-short term prediction data (the ultra-short term data performs prediction calculation on the related data of the power grid within a short time according to the current fixed value), namely, according to the online fixed value and the candidate control space (the candidate control space: the object set of the actual direct current, the pumped storage, the load control and the like of the system protection) aiming at the anticipated complex serious fault covered by the system protection device, the corresponding protection measures are searched, whether the static overload (calculated according to the operation mode data), the voltage crossing line and the frequency of the power grid are safe or not is judged after the system protection measures are implemented, if the static overload, the voltage crossing line and the frequency are safe, the checking passes, if, if the check fails, entering the step 2) to perform strategy fixed value setting calculation again;
| serial number | On-line fixed value name | Value after setting |
| 1 | Boosting DC and pump action under-cut power | 1600 |
| 2 | Raising DC and pump action threshold power | 3900 |
| 3 | Load action threshold power cut-off | 3700 |
| 4 | Load action under-cut power capable of being cut off | 3700 |
| 5 | DC loss power allowed load shedding threshold | 7800 |
Step 4, the dispatching terminal online fixed value issuing module and the station terminal device realize online fixed value and metering through three times of interactive confirmation
Calculating the reliable issuing and effectiveness of the operation mode words:
the dispatching end issues the section time of the module, calculates the operation mode word and issues the online fixed value to the system protection device;
after the device receives the data, whether the attached operation mode words are matched with the current power grid operation mode is checked, if the matching is successful, the received section time, the operation mode words and the online fixed value are returned to the dispatching end again for consistency confirmation; if the matching fails, a returned matching failure mark is set;
after the scheduling end receives the matching information returned by the device, if the matching is successful, the online fixed value issuing module issues the section time, the operation mode calculation word, the online fixed value and the effective mark again after confirming that the online fixed value to be issued, the operation mode calculation word and the information returned by the device are consistent; if the matching fails, the online fixed value issuing is carried out again;
after the plant station end receives the online fixed value, the operation mode word and the effective mark, the online fixed value and the operation mode word are verified whether to be consistent with the online fixed value and the operation mode word issued in the front or not, if the online fixed value and the operation mode word are consistent, the section time and the effective mark are returned to the dispatching end, the received information is adopted to update the online fixed value and the operation mode word stored in the device, the effective mark of the online fixed value in the device is updated to be effective and used for action logic judgment of the device in an online mode, and after the dispatching end receives the successful mark, the online fixed value and the operation mode word stored in the dispatching end are updated, and log recording is carried out on the operation process; if the two are not consistent, returning the section time and the validation failure mark to the scheduling end, and issuing the online fixed value again;
after the dispatching end receives the successful validation mark returned by the device, the dispatching end actively calls the online fixed value information of the device, the online fixed value information is compared with the online fixed value and the calculation operation mode word which are successfully issued in the previous round, and if the online fixed value and the calculation operation mode word are consistent, the issuing process is ended; otherwise, returning an issuing failure mark to the station end device, and re-performing online fixed value issuing. And after receiving the validation failure mark returned by the device, the scheduling end carries out online fixed value issuing again. And after receiving the issuing failure mark, the plant station end device updates the effective mark of the on-line fixed value in the device to be invalid.
In the above steps, the scheduling end periodically generates a real-time running mode word according to real-time uploading data of the device and compares the real-time running mode word with a calculation running mode word used by an online constant value checking module, if the change of the section power exceeds a specified threshold value or any one of the states of element switching, direct current control mode and pressing plate changes, the current calculation of the online constant value setting module and the online constant value checking module is terminated, a new round of constant value setting calculation is started in the step 2, and if the two are consistent, the mode word comparison in the next period is started;
example 2
The invention also provides a system for confirming the fixed value of the protection strategy of the power system, which comprises the following steps:
an acquisition module: the system comprises a dispatching end, a system protection device and a control end, wherein the dispatching end is used for acquiring operation mode data (element switching and stopping, section power), a direct current control mode, a pressing plate switching state and measured information of controllable quantity from the system protection device in real time;
a constant value calculation module: the system comprises a dispatching end, a real-time operation mode word and a fixed value online setting calculation device, wherein the dispatching end is used for splicing information related to the fixed value in the obtained actually measured information of the dispatching end into the real-time operation mode word, and the fixed value online setting calculation device is used for performing fixed value online setting calculation according to a power grid model and actually measured data sent by the device to obtain an online fixed value with the operation mode word;
a fixed value confirmation module: the system is used for checking the online fixed value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, submitting the online fixed value to a given value issuing module if the check is passed, and recalculating the online fixed value by a fixed value calculating module if the check is not passed;
and the online fixed value issuing module and the station terminal take effect after interactive confirmation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for issuing a fixed value of a protection strategy of an electric power system is characterized by comprising the following steps:
1) the system protection device acquires operation mode data, a direct current control mode, a pressing plate on/off state and measured data of controllable quantity in real time;
2) splicing the information related to the fixed value in the obtained actual measurement information into a real-time operation mode word, and carrying out fixed value online setting calculation according to the actual measurement data sent by the power grid model and the system protection device to obtain an online fixed value with the operation mode word;
3) checking the online setting value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, submitting the online setting value to a setting value issuing module if the checking is passed, and returning to the step 2 if the checking is not passed;
4) and the online fixed value issuing module and the station terminal are confirmed through interaction.
2. The power system protection strategy fixed value issuing method according to claim 1, characterized in that: the method comprises the following steps of carrying out fixed value online setting calculation according to a power grid model and measured data sent by a system protection device to obtain an online fixed value with an attached operation mode character:
and combining the power grid model and the measured data sent by the system protection device to generate calculation data for the on-line setting calculation of the fixed value, calculating the on-line fixed value through the calculation data, splicing information related to the fixed value in the measured data obtained by the scheduling end at the starting moment of calculation into a real-time operation mode word, and associating the real-time operation mode word with the on-line fixed value.
3. The power system protection strategy fixed value issuing method according to claim 1, characterized in that: and the dispatching end periodically splices the measured information into operation mode words and compares the operation mode words with the operation mode words corresponding to the operation mode data used for checking the current online setting value, if the operation mode words are not consistent with the operation mode words, the checking of the online setting value in the step 3) is terminated, the step 2) is returned, and if the operation mode words are consistent with the operation mode words, the next period of operation mode word comparison is carried out.
4. The power system protection strategy fixed value issuing method according to claim 3, characterized in that: splicing the actual measurement information into a real-time operation mode word and comparing the real-time operation mode word with an operation mode word corresponding to operation mode data used for checking the current online setting value, specifically: and comparing the key section power gear, the key element on-off state, the key pressing plate on-off state and the direct current control mode contained in the two operation mode words.
5. The power system protection strategy fixed value issuing method according to claim 1, wherein the checking of the online fixed value based on the power grid real-time operation mode data and the ultra-short-term prediction data is that: aiming at anticipated complex and serious faults covered by a system protection device, searching corresponding system protection measures according to an online fixed value and a candidate control space, judging static overload, voltage out-of-limit and frequency safety of a power grid after the system protection measures are implemented, and checking if the static overload, the voltage out-of-limit and the frequency safety are safe.
6. The power system protection strategy fixed value issuing method according to claim 1, characterized in that: the interactive confirmation of the online fixed value issuing module and the plant station end in the step 4) is specifically as follows:
the scheduling end issues the operation mode words and the online fixed values to the plant station end;
the station terminal analyzes the operation mode word, checks whether the operation mode word is matched with the operation mode of the current power grid, returns the received online fixed value and the operation mode word to the dispatching terminal for confirmation if the operation mode word is matched with the operation mode word, and returns a matching failure mark if the operation mode word is not matched with the operation mode word;
the dispatching end analyzes the returned matching information, if the matching fails, the issuing process is ended, if the matching succeeds, consistency judgment is carried out on the online constant value and the operation mode word returned by the plant station end, if the online constant value and the operation mode word are consistent, the online constant value and the operation mode word are continuously issued and take effect, and if the online constant value and the operation mode word are not consistent, the current online constant value and the operation mode word corresponding to the online constant value are issued again to the plant station end;
after the plant terminal receives the online fixed value and the operation mode word from the dispatching terminal, consistency comparison is carried out between the online fixed value and the operation mode word and the online fixed value and the operation mode word issued by the dispatching terminal at the previous time, if the online fixed value and the operation mode word are consistent, the latest received online fixed value and operation mode word are updated into a memory of the plant terminal, an effective mark of the online fixed value in the memory of the plant terminal is updated to be effective, an effective successful mark is returned to the dispatching terminal, and if the online fixed value and the operation mode word are not consistent, an effective mark of failure in effect is returned to the dispatching terminal;
the dispatching end receives an effective mark returned by the plant station end, and if the effective mark fails, the current online fixed value and the current operation mode word are retransmitted; if the online fixed value and the running mode word are successful, updating the online fixed value and the running mode word stored in the dispatching end, simultaneously calling the online fixed value and the running mode word of the plant station end, carrying out consistency comparison on the online fixed value and the running mode word and the online fixed value and the running mode word which are successfully issued in the previous round, if the online fixed value and the running mode word are consistent, finishing the issuing process, otherwise, returning an issuing failure mark to the plant station end, and re-issuing the online fixed value and the corresponding running mode word;
and after receiving the issuing failure mark, the station terminal updates the effective mark of the online fixed value of the station terminal to be invalid.
7. A power system protection strategy fixed value issuing device is characterized by comprising:
an acquisition module: the system comprises a dispatching end, a system protection device and a control end, wherein the dispatching end is used for acquiring operation mode data, a direct current control mode, a pressing plate switching state and actual measurement information of controllable quantity from the system protection device in real time;
a constant value calculation module: the system comprises a dispatching end, a real-time operation mode word and a fixed value online setting calculation device, wherein the dispatching end is used for splicing information related to the fixed value in the obtained actually measured information of the dispatching end into the real-time operation mode word, and the fixed value online setting calculation device is used for performing fixed value online setting calculation according to a power grid model and actually measured data sent by the device to obtain an online fixed value with the operation mode word;
a fixed value checking module: the online setting value checking module is used for checking the online setting value based on the real-time operation mode data and the ultra-short-term prediction data of the power grid, and if the check fails, the online setting value checking module is used for checking the online setting value based on the setting value online setting calculation result which is re-performed by the setting value calculation module;
and the fixed value issuing module is used for interacting with the factory station end when the result of the check performed by the fixed value checking module is that the check passes, and enabling the online fixed value to take effect after the interaction confirmation.
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