CN113626298B - Multi-terminal direct current limiting online recovery function test method, system, equipment and medium - Google Patents

Multi-terminal direct current limiting online recovery function test method, system, equipment and medium Download PDF

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CN113626298B
CN113626298B CN202110750371.1A CN202110750371A CN113626298B CN 113626298 B CN113626298 B CN 113626298B CN 202110750371 A CN202110750371 A CN 202110750371A CN 113626298 B CN113626298 B CN 113626298B
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current
test
limiting
power
fault
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CN113626298A (en
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曾冠铭
郭琦
李书勇
陈钦磊
罗超
林雪华
刘志江
卢远宏
陈德扬
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
    • G06F11/3457—Performance evaluation by simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/34—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment
    • G06F11/3409—Recording or statistical evaluation of computer activity, e.g. of down time, of input/output operation ; Recording or statistical evaluation of user activity, e.g. usability assessment for performance assessment
    • 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
    • H02H7/268—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 for dc systems
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • General Physics & Mathematics (AREA)
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Abstract

The invention relates to the technical field of electric power, in particular to a method, a system, equipment and a medium for testing the on-line recovery function of multi-terminal direct current limiting, comprising the following steps: setting test parameters of the multi-terminal direct current system on a real-time simulation platform; adopting a forward function verification test and three preventive tests to carry out simulation test on the current-limiting online recovery function to obtain test results corresponding to the tests; and judging whether the current-limiting on-line recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, indicating that the current-limiting on-line recovery function logic is correct. The invention utilizes the forward function verification test and three preventive tests to test the correctness and the validity of the fault pole current-limiting online recovery function after the multi-terminal direct current system with low cost and high efficiency, and further maintains the safe and stable operation of the power grid.

Description

Multi-terminal direct current limiting online recovery function test method, system, equipment and medium
Technical Field
The invention relates to the technical field of electric power, in particular to a method, a system, equipment and a medium for testing a multi-terminal direct current limiting online recovery function.
Background
At the present stage, with the practical application of the ultra-high voltage multi-end hybrid direct current, the grid structure of the power system is further complicated, and the control strategy of the direct current control system is further complicated.
The current multi-terminal direct current engineering is provided with a safety and stability strategy, namely, when a single fault occurs, the fault is coordinated and handled by the safety and stability strategy, however, when a second fault occurs after a first fault occurs, not only is the frequency stability of the system influenced to a certain extent, but also the complexity of the safety and stability strategy is greatly increased, which is not beneficial to the correct execution of the safety and stability strategy, therefore, in order to ensure the correct execution of the safety and stability strategy, the multi-terminal direct current engineering is added with a post-fault pole (a pole with a post-fault) current-limiting online recovery function, but a method capable of effectively testing the current-limiting online recovery function of the multi-terminal direct current engineering is lacked at present.
Disclosure of Invention
The invention provides a method, a system, equipment and a medium for testing the current-limiting online recovery function of a multi-terminal direct current project, and solves the technical problem that the prior art lacks a method capable of effectively testing the current-limiting online recovery function of the multi-terminal direct current project.
In order to solve the technical problems, the invention provides a method, a system, equipment and a medium for testing the on-line recovery function of multi-terminal direct current limiting.
In a first aspect, the present invention provides a method for testing a multi-terminal dc current-limiting online recovery function, which is applied to a multi-terminal dc system, wherein the multi-terminal dc system at least includes three converter stations, and the method includes the following steps:
setting test parameters of the multi-terminal direct current system on a real-time simulation platform;
adopting a forward function verification test and three preventive tests to carry out simulation test on the current-limiting online recovery function to obtain test results corresponding to the tests;
judging whether the current-limiting on-line recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, indicating that the current-limiting on-line recovery function logic is correct; otherwise, the current-limiting online recovery function logic is incorrect;
wherein setting the test parameters comprises: each converter station is put into a current-limiting online recovery function, a test initial state of the multi-terminal direct-current system is set, a current-limiting online recovery power limit value and current-limiting online recovery time are set, and a power-limiting famous value is obtained according to the current-limiting online recovery power limit value;
the three prophylactic tests included:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the power limit nominal value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the nominal power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter when the rear fault pole is a set rear fault pole direct current system is restarted.
In further embodiments, setting the assay initial state comprises: setting the multi-terminal direct current system to be in a bipolar four-converter operation state, a bipolar power control mode and adjusting bipolar direct current power to be a first power value;
the obtaining of the power limit named value according to the current-limiting online recovery power limit value specifically includes: when the multi-terminal direct current system is set to comprise 3 converter stations and is in a bipolar operation mode of one transmitting terminal converter station and two receiving terminal converter stations, if a set fault pole exits from one receiving terminal converter station, a power limit named value is obtained according to the current limit online recovery power limit value and the rated power of the other receiving terminal converter station;
wherein the first power value is greater than the power limit named value.
In further embodiments, the forward functional validation test comprises:
operating the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
setting the fault of the first fault pole direct-current line, and setting the fault station quit of the second fault pole within the current-limiting online recovery time;
after the rear fault pole direct current system is restarted, whether two conditions of a forward function verification test are met is judged: whether the direct current power of the rear fault pole is equal to the power limit named value or not and whether the current-limiting online recovery function is effective or not;
if both conditions of the forward function verification test are met, setting forward action of a frequency limiting function for the transmitting end converter station, and continuously judging whether the direct current power of the rear fault electrode exceeds a power limiting nominal value; otherwise, ending the simulation test;
after the forward action of the frequency limiting function, if the direct current power of the rear fault electrode does not exceed the power limit nominal value, judging that the test result of the forward function verification test is successful, resetting the power limit of the rear fault electrode, and adopting three preventive tests to continuously test the current-limiting online recovery function; if yes, ending the simulation test.
In a further embodiment, recording is used to detect whether the current limit online recovery function is in effect.
In further embodiments, the first prophylactic test comprises:
debugging the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
setting the fault of the direct current line of the first fault pole, and setting the fault station quit of the second fault pole after the current-limiting online recovery time;
after the post fault pole direct current system is restarted, whether two conditions of a first preventive test are met is judged, namely: whether the direct current power of the rear fault pole is equal to a first power value or not and whether the current-limiting online recovery function is ineffective or not;
if the two conditions of the first preventive test are both satisfied, judging that the first preventive test result is successful, and ending the first preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test.
In further embodiments, the second prophylactic test comprises:
debugging the multi-terminal direct current system to the initial test state, setting one pole as a first fault pole and the other pole as a second fault pole, and adjusting the direct current power of the second fault pole to a second power value in a bipolar power control mode;
setting a fault of a direct current line of a fault electrode firstly, and setting the fault of the fault electrode after the current-limiting online recovery time;
after the post fault pole direct current system is restarted, judging whether two conditions of a second preventive test are met: whether the direct current power of the rear fault pole is equal to the second power value or not and whether the current-limiting online recovery function is not effective or not;
if the two conditions of the second preventive test are both satisfied, judging that the second preventive test result is successful, and ending the second preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test;
wherein the second power value is less than the power limit named value.
In further embodiments, the third prophylactic test comprises:
debugging the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
exiting one converter of the post-fault pole, and adjusting the post-fault pole direct-current power to a third power value;
setting the fault of the first fault pole direct-current line, and setting the fault station quit of the second fault pole within the current-limiting online recovery time;
after the rear fault pole direct current system is restarted, whether two conditions of a third preventive test are met is judged: whether the direct current power of the rear fault pole is equal to a third power value or not and whether the current-limiting online recovery function is ineffective or not;
if the two conditions of the third preventive test are both satisfied, judging that the third preventive test result is successful, and ending the third preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test;
when the post-fault pole exits from one receiving end converter station, the third power value is smaller than one half of rated power of the other receiving end converter station.
In a second aspect, the present invention provides a multi-terminal dc current-limiting online recovery function testing system, including:
the parameter acquisition module is used for setting test parameters of the multi-terminal direct current system on a real-time simulation platform;
the simulation test module is used for performing simulation test on the current-limiting online recovery function by adopting a forward functional verification test and three preventive tests to obtain test results corresponding to the tests;
the simulation analysis module is used for judging whether the current-limiting online recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, the current-limiting online recovery function logic is correct; otherwise, the current-limiting online recovery function logic is incorrect;
wherein setting the test parameters comprises: each converter station is put into a current-limiting online recovery function, a test initial state of the multi-terminal direct-current system is set, a current-limiting online recovery power limit value and current-limiting online recovery time are set, and a power-limiting famous value is obtained according to the current-limiting online recovery power limit value;
the three prophylactic tests included:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the power limit nominal value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the named power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter during operation after the set rear fault pole direct current system is restarted.
In a third aspect, the present invention further provides a computer device, including a processor and a memory, where the processor is connected to the memory, the memory is used for storing a computer program, and the processor is used for executing the computer program stored in the memory, so that the computer device executes the steps for implementing the method.
In a fourth aspect, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above method.
The invention provides a method, a system, equipment and a medium for testing a multi-terminal direct current-limiting online recovery function. Compared with the prior art, the method utilizes the forward function verification test and three preventive tests, not only detects the logic of the current-limiting online recovery function, but also detects the misoperation condition of the current-limiting online recovery function, and further improves the accuracy of the simulation test, thereby ensuring the safe operation of the power grid system.
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Fig. 1 is a schematic flow chart of a method for testing a multi-terminal dc current-limiting online recovery function according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a simulation test flow provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of a multi-terminal dc current-limiting online recovery function testing system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
Referring to fig. 1, fig. 1 is a diagram illustrating a method for testing an online recovery function of a multi-terminal dc current-limiting system according to an embodiment of the present invention, where the multi-terminal dc system includes at least three converter stations, and the method includes:
s1, setting test parameters of the multi-terminal direct current system on a real-time simulation platform.
Before a multi-terminal direct current system is subjected to simulation test, test parameters are set through a real-time simulation platform, wherein the simulation test comprises a forward functional verification test and three preventive tests, and the three preventive tests comprise:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the power limit nominal value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the named power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter when the rear fault pole is a set rear fault pole direct current system is restarted.
In this embodiment, the multi-terminal direct current system at least includes three converter stations, and in this embodiment, the multi-terminal direct current system includes three converter stations for exemplary illustration, it should be noted that the three converter stations may be a sending-end converter station, a first receiving-end converter station, and a second receiving-end converter station, or may be a first sending-end converter station, a second sending-end converter station, and a receiving-end converter station, respectively, and a person skilled in the art may select the converter stations according to specific implementation situations; for convenience of description, in this embodiment, the multi-terminal dc system includes three converter stations, and the three converter stations are respectively a sending-end converter station, a first receiving-end converter station, and a second receiving-end converter station, which is exemplified, but the present invention is not limited thereto.
In one embodiment, the test parameters set on the real-time simulation platform include: putting the current-limiting online recovery function into each converter station, setting the test initial state of the multi-terminal direct-current system, and setting the current-limiting online recovery power limit value P 0 And current limit on-line recovery time T 0 And obtaining a power limit named value according to the current limit online recovery power limit value; in this embodiment, the current-limited online recovery function may be switched on and off by a control word.
In an embodiment, the obtaining of the power limit named value according to the current-limiting online recovery power limit value specifically includes: when the multi-terminal direct-current system is set to comprise three converter stations and is in a bipolar operation mode of one transmitting-end converter station and two receiving-end converter stations, if a set fault electrode exits from one of the receiving-end converter stations, a power limit nominal value is obtained according to the current-limiting online recovery power limit value and the rated power of the other receiving-end converter station; such as: if the set fault pole exits from the first receiving end converter station, obtaining a power limit nominal value according to the current limit online recovery power limit value and the rated power of the second receiving end converter station; and if the set fault pole exits from the second receiving end converter station, obtaining a power limit nominal value according to the current limit online recovery power limit value and the rated power of the first receiving end converter station.
In one embodiment, the setting of the initial test state of the multi-terminal dc system includes: setting the multi-terminal direct current system to be in a bipolar four-converter operation state and a bipolar power control mode, and adjusting bipolar direct current power to a first power value; and the first power value is larger than the power limit named value and smaller than the rated power of the other receiving end converter station.
In one embodiment, when the fault pole exits from the first receiving end converter station after the setting, the power limit nominal value restores the power limit value P on line according to the current limit 0 Calculating the rated power of the second receiving end converter station; wherein the current limit recovers the power limit value P online 0 For per unit value, one skilled in the art can adjust the current-limiting online restoration power limit value P according to specific implementation 0 The value is usually 1 or less.
In this embodiment, the calculation formula of the named value of the power limit is:
Q＝P 0 *P N
wherein Q represents a power limit nominal value, P 0 Indicating a current-limited on-line restoration power limit value, P N The rated power of the receiving end converter station is shown, and the current limit is preferentially recovered on line by the embodiment to the power limit value P 0 Set to 0.7.
In this embodiment, the rated power of the receiving end converter station is divided into the following two cases:
i, rated power of the first receiving end converter station is the same as rated power of the second receiving end converter station, and P is at the moment N The rated power of the two receiving end converter stations is the same;
the rated power of the first receiving end converter station is different from that of the second receiving end converter station, and at the moment, the power is different according to the post-fault poleSetting condition, P N Is the rated power of the corresponding receiving end converter station.
It should be noted that when the power ratings of the first receiving end converter station and the second receiving end converter station are different, that is, when the power rating of the first receiving end converter station is
Figure BDA0003144195240000081
Rated power of the second receiving end converter station is
Figure BDA0003144195240000082
Figure BDA0003144195240000083
When the power limit of the first receiving end converter station is not more than the corresponding power limit, namely the power limit is a famous value, namely the power limit of the first receiving end converter station is not more than the corresponding power limit, namely the power limit is a famous value
Figure BDA0003144195240000084
If the monopole of the first receiving end converter station is set as a rear fault pole, the monopole of the second receiving end converter station is set as a first fault pole, after the rear fault pole exits from the first receiving end converter station, the sending end converter station and the second receiving end converter station are restarted, and the power of the second receiving end converter station does not exceed the power limit nominal value of the second receiving end converter station, namely the power of the second receiving end converter station does not exceed the power limit nominal value, namely the power of the second receiving end converter station is limited to the first receiving end converter station
Figure BDA0003144195240000091
It should be noted that, for convenience of description, the following simulation tests are all set to make the post-fault pole exit from the first receiving end converter station, and therefore, in this embodiment, the first power value is larger than the power limit nominal value of the second receiving end converter station and is smaller than the rated power of the second receiving end converter station.
In one embodiment, the current-limiting online recovery time is a time interval of successive faults, and in the time interval, if bipolar successive faults occurThe current-limiting online recovery function takes effect; otherwise, the current limit online recovery function is not effective, for example, the current limit online recovery time T is set 0 When the first fault pole has any fault, in this embodiment, for convenience of description, the first fault pole is set to be a dc line ground fault, and the second fault pole has a fault after 900s, that is, only a single-pole fault occurs during the current-limiting online recovery time, and the current-limiting online recovery function is not active.
And S2, sequentially carrying out simulation test on the current-limiting online recovery function by adopting a forward functional verification test and three preventive tests to obtain test results corresponding to the tests.
In one embodiment, after the test parameters are set by the real-time simulation platform, the forward functional verification test is performed first, and then the three preventative tests are performed, and those skilled in the art can adjust the three preventative tests according to the specific implementation condition, but should ensure that the three preventative tests are after the forward functional verification test.
For convenience of illustration, as shown in fig. 2, the forward functional verification test, the first preventative test, the second preventative test and the third preventative test are performed in sequence in this embodiment, and those skilled in the art can adjust the test sequence of the three preventative tests according to the specific implementation conditions, but should ensure that the three preventative tests follow the forward functional verification test.
In one embodiment, the forward functional verification test specifically includes:
operating the multi-terminal direct current system to a test initial state, and setting one pole as a first fault pole and the other pole as a second fault pole;
setting the fault of the first fault pole direct-current line, and setting the fault station quit of the second fault pole within the current-limiting online recovery time;
after the rear fault pole direct current system is restarted, whether two conditions of a forward function verification test are met is judged: whether the direct current power of the rear fault pole is equal to a preset power limit named value or not; whether the current-limiting online recovery function is in effect;
if both conditions of the forward function verification test are met, setting forward action of a frequency limiting function for the sending-end converter station, and continuously judging whether the direct-current power of the rear fault electrode exceeds a power limiting nominal value; otherwise, ending the simulation test;
after the forward action of the frequency limiting function, if the direct current power of the rear fault electrode does not exceed the nominal value of the power limit, judging that the test of the forward function verification test is successful, resetting the power limit of the rear fault electrode, and sequentially testing the current-limiting online recovery function by adopting three preventive tests;
after the forward action of the frequency limiting function, if the direct current power of the rear fault electrode exceeds the power limiting nominal value, the simulation test is ended, and three preventive tests are not performed any more.
In one embodiment, faults include dc line faults, single valve faults, and pole faults, as well as manual shutdown of a pole or fault exit; in this embodiment, the first failure pole may reach an assigned state according to a control policy set by the dc system, which specifically includes:
if the direct current line is in fault, the whole is restarted; if the valve is a single valve fault, the non-fault valve bank is restarted after the fault valve bank is locked; if the pole is in fault or the pole is manually stopped, at the moment, the three ends are stopped, and the corresponding pole is locked; and if the voltage is manually or in fault, locking the fault station and restarting other transport stations.
It should be noted that, no matter the first fault pole is in any state, the last fault pole is switched to the unipolar current mode to implement the current-limiting online restoration function of the last fault pole, and a person skilled in the art may adjust the fault condition according to the specific implementation situation, and is not limited to the fault condition described in this embodiment.
In one embodiment, whether the current-limiting online recovery function is effective is judged through the function flag bit of the recording, that is: if the current-limiting on-line recovery function is not effective, the function flag bit is 0; if the current-limiting online recovery function is effective, the function flag bit is 1; those skilled in the art can set fault recording and manually trigger recording according to specific implementation conditions.
It should be noted that, in this embodiment, the current-limiting online recovery function is effective and includes two types: one is correct, namely the current-limiting online recovery function is effective and the effect is in accordance with the expectation; the other is error effect, namely the effect is not in accordance with the expectation after the current-limiting online recovery function takes effect; since the function flag bit of the recording is used to detect whether the current-limiting online recovery function is in effect, in an embodiment of the present invention, it is further detected whether the current-limiting online recovery function is in effect correctly by determining whether the dc power of the post-fault pole is equal to a preset nominal power limit value.
In this embodiment, the first power value is greater than a power limit named value of the second receiving-end converter station, and after the post-fault pole dc system is restarted, if the current-limiting online recovery function is correctly effective, the dc power of the post-fault pole is equal to the power limit named value of the second receiving-end converter station, that is, the dc power of the post-fault pole is equal to the power limit named value of the second receiving-end converter station
Figure BDA0003144195240000111
And if the current-limiting online recovery function is in effect, the direct-current power of the rear fault pole is not equal to the power limit named value of the second receiving end converter station.
It should be noted that, because the power of the receiving-end converter station is slightly smaller than the power level of the sending-end converter station due to the loss of the dc system, the power of the sending-end converter station is used as the determination target of the dc power of the post-fault pole in this embodiment; in addition, a person skilled in the art may determine that the dc power of the post-fault pole is equal to the power limit nominal value of the second receiving end converter station according to the actual implementation condition when the dc power of the post-fault pole is determined to be within the range where the power limit nominal value of the second receiving end converter station is reasonable.
In an embodiment, if and only if both the two forward function verification conditions are satisfied, that is, if both the two forward function verification conditions are yes, it is indicated that the current-limiting online recovery function is correctly effective, and the dc power of the post-fault pole is equal to the power-limiting named value of the second receiving-end converter station, at this time, this embodiment puts a frequency-limiting function into the sending-end converter station, and sets an ac system frequency deviation signal in the dc control system, so that the dc power of the post-fault pole is increased, where the specific deviation signal is determined according to the actual condition of each dc system. The method comprises the steps of increasing the direct-current power of a rear fault electrode at a set frequency limit function power regulation rate; in this embodiment, the forward operation of the frequency limitation function is to increase the dc power of the post-fault pole.
In one embodiment, if any one of the two forward function verification conditions is not satisfied, it is determined that the current-limiting online recovery function logic is incorrect, the simulation test is ended, and the following three preventive tests are not performed any more.
It should be noted that, after the post-fault pole retreating station recovers operation, the control mode is switched to the single pole current mode, and before the power limitation is reset, the frequency limitation function does not act in the forward direction.
In this embodiment, after setting a frequency limiting function for a sending-end converter station to perform forward operation, determining whether the dc power of the post-fault pole exceeds a power limit nominal value of a second receiving-end converter station, and if the dc power of the post-fault pole exceeds the power limit nominal value of the second receiving-end converter station, determining that the current-limiting online recovery function logic is incorrect, ending a simulation test, and performing no more three preventive tests; if the current limit is not exceeded, judging that the forward function verification test is successful, resetting the power limit of the rear fault electrode, and sequentially continuing to test the current-limiting online recovery function by using three preventive tests so as to further ensure the comprehensiveness and effectiveness of the current-limiting online recovery function simulation test and ensure that the action condition of the current-limiting online recovery function conforms to the design expectation; in this embodiment, it is determined through wave recording whether the dc power of the rear fault electrode exceeds the power limit value of the second receiving-end converter station for a short time.
In this embodiment, the forward functional verification test is used for verifying the logic of the current-limiting online recovery function, the three preventive tests are used for verifying whether the current-limiting online recovery function is in malfunction, and on the basis of the forward functional verification test, the three error-prevention preventive test tests are performed, so that the comprehensiveness and effectiveness of the current-limiting online recovery function simulation test can be further ensured, and the action condition of the current-limiting online recovery function is ensured to meet the design expectation, thereby avoiding the impact of the malfunction of the current-limiting online recovery function on the power system, and ensuring the safe and stable operation of the power system.
In one embodiment, the first prophylactic test specifically comprises:
and restoring the multi-terminal direct current system to the initial test state.
Setting the fault of the first fault pole DC line and the current-limiting on-line recovery time T 0 And then setting the post fault pole fault station backing.
After the post fault pole direct current system is restarted, whether two conditions of a first preventive test are met is judged, namely: and whether the direct current power of the rear fault pole is equal to the first power value or not and whether the current-limiting online recovery function is ineffective or not are judged.
If the two conditions of the first preventive test are both satisfied, namely when the current-limiting on-line recovery function is not effective and the direct-current power of the post-fault pole is equal to the first power value, the first preventive test is judged to be successful, the first preventive test is ended, and the second preventive test is entered.
If any condition is not met, the current-limiting online recovery function logic is judged to be incorrect, the simulation test is ended, and the rest two preventive tests are not carried out.
In one embodiment, the second prophylactic test specifically comprises:
restoring the multi-terminal direct current system to the initial test state, and adjusting the direct current power of the post fault pole to a second power value in a bipolar power control mode;
setting the fault of the first fault pole DC line and the current-limiting on-line recovery time T 0 Setting a post-fault pole fault station returning;
after the post fault pole direct current system is restarted, whether two conditions of the second preventive test are met is judged: whether the direct current power of the rear fault pole is equal to the second power value or not and whether the current-limiting online recovery function is not effective or not; in this embodiment, the second power value is less than the power limit named value;
if the two conditions of the second preventive test are both satisfied, namely when the current-limiting on-line recovery function is not effective and the direct-current power of the post-fault pole is equal to a second power value, judging that the second preventive test is successful, ending the second preventive test, and entering a third preventive test;
if any condition is not met, the current-limiting online recovery function logic is judged to be incorrect, the simulation test is ended, and the rest two preventive tests are not carried out.
In this embodiment, before a fault occurs, when the unipolar power of the multi-terminal dc system is smaller than the nominal power limit value, the current-limiting online recovery function is disabled, and therefore, when the dc power of the post-fault pole is equal to the second power value and the current-limiting online recovery function is not in effect, it is indicated that the second preventive test is successful; in addition, when the multi-terminal dc system is restored to the initial test state in this embodiment, the first fault pole and the second fault pole have the same power in the bipolar power control mode.
In one embodiment, the third prophylactic test specifically comprises:
restoring the multi-terminal direct current system to the initial test state, exiting one converter of the post-fault pole, and adjusting the direct current power of the post-fault pole to a third power value;
setting the fault of the first fault pole DC line and the current-limiting on-line recovery time T 0 Setting the fault exit station of the rear fault pole;
after the rear fault pole direct current system is restarted, judging whether two conditions of a third preventive test are met: whether the direct current power of the rear fault pole is equal to a third power value or not and whether the current-limiting online recovery function is ineffective or not; when the post-fault pole exits from the first receiving end converter station, the third power value is smaller than one half of rated power of the second receiving end converter station, namely the third power value is smaller than
Figure BDA0003144195240000131
If the two conditions of the third preventive test are both satisfied, namely when the current-limiting on-line recovery function is not effective and the direct-current power of the post-fault pole is equal to a third power value, judging that the third preventive test is successful, and ending the third preventive test;
if any condition is not met, the current-limiting online recovery function logic is judged to be incorrect, the simulation test is ended, and the rest two preventive tests are not carried out.
And if the forward verification function test and the three preventive tests are successful, indicating that the current-limiting on-line recovery function logic is correct, and ending the simulation test.
It should be noted that after exiting one converter of the post-fault pole, the post-fault pole is in a single-converter operation mode; when the rear fault is in a three-terminal single converter operation mode, the current-limiting online recovery function is not enabled.
S3, judging whether the current-limiting on-line recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, indicating that the current-limiting on-line recovery function logic is correct; otherwise, the current-limiting online recovery function logic is incorrect.
In this embodiment, three preventive tests are used for preventing error, and if any one of the preventive tests is absent, the current-limiting online recovery function may be in malfunction, so that the actual power level of the multi-terminal dc system is not consistent with the expected power level, and the generated power difference may cause fluctuations of the power system to different degrees, such as: when the generated power difference is large, a large impact is generated on the power system, and even a system breakdown of the weak alternating current system is caused.
In this embodiment, a method for testing a multi-terminal dc current-limiting online recovery function utilizes a forward functional verification test and three preventive tests to test the current-limiting online recovery function, and further determines whether the current-limiting online recovery function is in false operation or not on the basis of ensuring the logic correctness of the current-limiting online recovery function, thereby greatly improving the comprehensiveness and effectiveness of the whole functional test, ensuring that a stability strategy can be correctly executed under the condition that the safety strategy conforms to the expected working condition, improving the stability of the safe operation of a power grid, and avoiding causing great impact on a power system.
It should be noted that, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation to the implementation process of the embodiment of the present application.
In an embodiment, as shown in fig. 3, a multi-terminal dc current-limiting online recovery function testing system is provided, which is applied to a multi-terminal dc system, where the multi-terminal dc system at least includes three converter stations, and the three converter stations are a sending-end converter station, a first receiving-end converter station, and a second receiving-end converter station, respectively, and the system includes:
a parameter obtaining module 101, configured to set test parameters of the multi-terminal dc system on a real-time simulation platform;
the simulation test module 102 is used for sequentially performing simulation test on the current-limiting online recovery function by adopting a forward functional verification test and three preventive tests to obtain test results corresponding to the tests;
the simulation analysis module 103 is configured to determine whether the current-limiting online recovery function logic is correct according to the test result, and if the test results of the forward function verification test and the three preventative tests are successful, it is determined that the current-limiting online recovery function logic is correct; otherwise, the current-limiting online recovery function logic is incorrect;
wherein setting the test parameters comprises: each converter station is put into a current-limiting online recovery function, a test initial state of the multi-terminal direct-current system is set, a current-limiting online recovery power limit value and current-limiting online recovery time are set, and a power limit nominal value is obtained according to the current-limiting online recovery power limit value.
The three prophylactic tests included:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the nominal power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the named power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter during operation after the set rear fault pole direct current system is restarted.
For specific limitations of a multi-terminal dc current-limiting online recovery function test system, reference may be made to the above limitations of a multi-terminal dc current-limiting online recovery function test method, which is not described herein again. Those of ordinary skill in the art will appreciate that the various modules and steps described in connection with the embodiments disclosed herein may be implemented as hardware, software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The multi-terminal direct current-limiting online recovery function testing system provided by the invention completes the verification of the current-limiting online recovery function through the parameter acquisition module, the simulation testing module and the simulation analysis module, and solves the technical problem that the prior art lacks a method capable of effectively testing the current-limiting online recovery function of multi-terminal direct current engineering; the system provided by the embodiment utilizes four simulation tests, tests the correctness and the effectiveness of the fault pole current limiting online recovery function after the multi-terminal direct-current system at low cost and high efficiency, further maintains the safe and stable operation of the power grid, and simultaneously ensures the correct execution of the stability strategy.
FIG. 4 is a computer device including a memory, a processor, and a transceiver connected via a bus according to an embodiment of the present invention; the memory is used to store a set of computer program instructions and data and may transmit the stored data to the processor, which may execute the program instructions stored by the memory to perform the steps of the above-described method.
Wherein the memory may comprise volatile memory or nonvolatile memory, or may comprise both volatile and nonvolatile memory; the processor may be a central processing unit, a microprocessor, an application specific integrated circuit, a programmable logic device, or a combination thereof. By way of example, and not limitation, the programmable logic device described above may be a complex programmable logic device, a field programmable gate array, general array logic, or any combination thereof.
In addition, the memory may be a physically separate unit or may be integrated with the processor.
It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 4 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or fewer components than shown, or may combine certain components, or have the same arrangement of components.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method.
The embodiment of the invention provides a method, a system, computer equipment and a medium for testing the on-line recovery function of multi-terminal direct current limiting, wherein the method for testing the on-line recovery function of multi-terminal direct current limiting detects and verifies whether the current-limiting on-line recovery function accords with the design expectation or not after a fault pole is withdrawn from a station on line after verification by using a real-time simulation platform, so that the safe and stable operation level of a power grid is improved; in addition, the method provided by the embodiment meets the testing requirement of the multi-terminal direct current system, and is simple in implementation method and convenient to operate.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in or transmitted from a computer-readable storage medium to another computer-readable storage medium, e.g., from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line, or wireless (e.g., infrared, wireless, microwave, etc.) connection.
Those skilled in the art will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and the computer program can include the processes of the embodiments of the methods described above when executed.
The above-mentioned embodiments only express some preferred embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these should be construed as the protection scope of the present application. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.

Claims (10)

1. A multi-terminal direct current limiting online recovery function test method is applied to a multi-terminal direct current system, the multi-terminal direct current system at least comprises three converter stations, and the method is characterized by comprising the following steps:
setting test parameters of the multi-terminal direct current system on a real-time simulation platform;
adopting a forward function verification test and three preventive tests to carry out simulation test on the current-limiting online recovery function to obtain test results corresponding to the tests;
judging whether the current-limiting online recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, indicating that the current-limiting online recovery function logic is correct; otherwise, it shows that the current-limiting on-line recovery function logic is incorrect;
wherein setting the test parameters comprises: each converter station is put into a current-limiting online recovery function, a test initial state of the multi-terminal direct-current system is set, a current-limiting online recovery power limit value and current-limiting online recovery time are set, and a power-limiting famous value is obtained according to the current-limiting online recovery power limit value;
the three prophylactic tests included:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the power limit nominal value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the named power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter when the rear fault pole is a set rear fault pole direct current system is restarted.
2. The method for testing the multi-terminal direct current limiting online recovery function of claim 1, wherein:
setting the test initial state comprises: setting the multi-terminal direct current system to be in a bipolar four-converter operation state, a bipolar power control mode and adjusting bipolar direct current power to be a first power value;
the obtaining of the power limit named value according to the current-limiting online recovery power limit value specifically includes: when the multi-terminal direct current system is set to comprise three converter stations and is in a bipolar operation mode of one transmitting-end converter station and two receiving-end converter stations, if a set fault pole exits from one receiving-end converter station, a power limit named value is obtained according to the current-limiting online recovery power limit value and the rated power of the other receiving-end converter station;
wherein the first power value is greater than the power limit named value.
3. The method for testing the multi-terminal direct current limiting online recovery function of claim 1, wherein the forward function verification test comprises:
operating the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
setting the fault of the first fault pole direct-current line, and setting the fault station quit of the second fault pole within the current-limiting online recovery time;
after the rear fault pole direct current system is restarted, whether two conditions of a forward function verification test are met is judged: whether the direct current power of the rear fault pole is equal to the power limit named value or not and whether the current-limiting online recovery function is effective or not;
if both conditions of the forward function verification test are met, setting forward action of a frequency limiting function for the transmitting end converter station, and continuously judging whether the direct current power of the rear fault electrode exceeds a power limiting nominal value; otherwise, ending the simulation test;
after the forward action of the frequency limiting function, if the direct current power of the rear fault electrode does not exceed the power limit nominal value, judging that the test result of the forward function verification test is successful, resetting the power limit of the rear fault electrode, and adopting three preventive tests to continuously test the current-limiting online recovery function; if yes, ending the simulation test.
4. The method for testing the multi-terminal direct current limiting online recovery function of claim 3, wherein: and detecting whether the current-limiting online recovery function is effective or not by adopting wave recording.
5. The method as claimed in claim 1, wherein the first preventive test comprises:
debugging the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
setting the fault of the direct current line of the first fault pole, and setting the fault station quit of the second fault pole after the current-limiting online recovery time;
after the post fault pole direct current system is restarted, whether two conditions of a first preventive test are met is judged, namely: whether the direct current power of the rear fault pole is equal to a first power value or not and whether the current-limiting online recovery function is ineffective or not;
if the two conditions of the first preventive test are both satisfied, judging that the first preventive test result is successful, and ending the first preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test.
6. The method for testing the multi-terminal direct current limiting online recovery function of claim 1, wherein the second preventive test comprises:
debugging the multi-terminal direct current system to the initial test state, setting one pole as a first fault pole and the other pole as a second fault pole, and adjusting the direct current power of the second fault pole to a second power value in a bipolar power control mode;
setting a fault of a direct current line of a fault electrode firstly, and setting the fault of the fault electrode after the current-limiting online recovery time;
after the post fault pole direct current system is restarted, judging whether two conditions of a second preventive test are met: whether the direct current power of the rear fault pole is equal to the second power value or not and whether the current-limiting online recovery function is not effective or not;
if the two conditions of the second preventive test are both satisfied, judging that the second preventive test result is successful, and ending the second preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test;
wherein the second power value is less than the power limit named value.
7. The method for testing the multi-terminal direct current limiting online recovery function of claim 1, wherein the third preventive test comprises:
debugging the multi-terminal direct current system to the initial test state, and setting one pole as a first fault pole and the other pole as a second fault pole;
exiting one converter of the post-fault pole, and adjusting the post-fault pole direct current power to a third power value;
setting the fault of the direct-current line of the first fault pole, and setting the fault of the later fault pole to quit within the current-limiting online recovery time;
after the rear fault pole direct current system is restarted, whether two conditions of a third preventive test are met is judged: whether the direct current power of the rear fault pole is equal to a third power value or not and whether the current-limiting online recovery function is ineffective or not;
if the two conditions of the third preventive test are both satisfied, judging that the third preventive test result is successful, and ending the third preventive test;
if any condition is not met, judging that the current-limiting online recovery function logic is incorrect, and ending the simulation test;
when the post-fault pole exits from one receiving end converter station, the third power value is smaller than one half of rated power of the other receiving end converter station.
8. A multi-terminal direct current limiting online recovery function test system is characterized by comprising:
the parameter acquisition module is used for setting test parameters of the multi-terminal direct current system on a real-time simulation platform;
the simulation test module is used for performing simulation test on the current-limiting online recovery function by adopting a forward functional verification test and three preventive tests to obtain test results corresponding to the tests;
the simulation analysis module is used for judging whether the current-limiting online recovery function logic is correct or not according to the test result, and if the test results of the forward function verification test and the three preventive tests are successful, the current-limiting online recovery function logic is correct; otherwise, the current-limiting online recovery function logic is incorrect;
wherein setting the test parameters comprises: each converter station is put into a current-limiting online recovery function, a test initial state of the multi-terminal direct-current system is set, a current-limiting online recovery power limit value and current-limiting online recovery time are set, and a power-limiting famous value is obtained according to the current-limiting online recovery power limit value;
the three prophylactic tests included:
the first preventive test is used for testing whether the current-limiting online recovery function exceeds the current-limiting online recovery time and the power of the post-fault pole is higher than the power limit nominal value or not after the set post-fault pole direct-current system is restarted due to faults;
the second preventive test is used for testing whether the current-limiting online recovery function does not exceed the current-limiting online recovery time and the power of the post-fault pole is lower than the named power limit value or not after the set post-fault pole direct-current system is restarted due to faults;
and the third preventive test is used for testing whether the current-limiting online recovery function is in misoperation when the rear fault pole is a single converter during operation after the set rear fault pole direct current system is restarted.
9. A computer device, characterized by: comprising a processor and a memory, the processor being connected to the memory, the memory being adapted to store a computer program, the processor being adapted to execute the computer program stored in the memory to cause the computer device to perform the method of any of claims 1 to 7.
10. A computer-readable storage medium, characterized in that: the computer-readable storage medium has stored thereon a computer program which, when executed, implements the method of any of claims 1 to 7.
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