CN109002030B - Flexible direct current protection test method based on FT3 message switching value position acquisition - Google Patents
Flexible direct current protection test method based on FT3 message switching value position acquisition Download PDFInfo
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- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
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Abstract
The invention discloses a flexible direct current protection test method based on FT3 message switching value position collection, wherein a FT3 message protocol database is formed by acquiring FT3 message protocols of different flexible direct current converter stations, a test system detects and collects FT3 data messages such as tripping outlet and the like sent by a flexible direct current protection device in real time, the detected FT3 message searches a corresponding protocol from the FT3 database according to the LD name of the detected FT3 message, the actual state of the corresponding outlet position in the FT3 message is analyzed according to the protocol, and a closed-loop overhaul test of the field protection logic of the flexible direct current protection device converter station is realized by adopting a closed-loop mode of a test system for sending FT3 message sampling signals and stoping FT3 tripping signals to the outside. According to the invention, the protection logic and protection fixed value closed loop test of the flexible direct current protection device is completed by collecting and analyzing the FT3 message-based tripping outlet, so that the problem that the flexible direct current control protection device cannot carry out the protection logic and protection fixed value overhaul and verification on the site of the converter station is solved.
Description
Technical Field
The invention relates to the field of testing of control protection devices of flexible direct current converter stations, in particular to a flexible direct current protection testing method based on FT3 message switching value position acquisition.
Background
At present, with the great promotion of environmental management work, the solar energy and wind energy clean energy are more and more favored by people. However, the influence of natural factors such as limited climate environment, wind power, photovoltaic power generation and instability thereof are extremely unfavorable for large-area grid connection. The flexible direct current transmission can accurately control the active power flow through dynamic compensation of reactive power, and provides technical guarantee for grid-connected transmission of wind power and photovoltaic power generation.
In China, a power grid enterprise represented by a southern power grid company builds a world first multi-terminal flexible direct current transmission demonstration project in 2013, namely a southern Australian +/-160 kV multi-terminal flexible direct current transmission project. The most important link technology of flexible direct current transmission is the construction of an alternating current-direct current conversion, i.e. a converter station, as shown in fig. 4, and the control core of the converter station is a flexible direct current control protection device. The switching value of the protection outlet of the flexible direct current protection device mainly comprises two types, namely hard contact switching value, the type is consistent with the type of the switching value of the alternating current power transmission substation, and the type of the switching value is digital message switching value taking FT3 messages as transmission media, and the type of the switching value has high transmission speed and has no related application in the alternating current power transmission substation.
The use of hard contacts or GOOSE trip signals for the associated protection logic service of protection devices has been very widely used in ac substations. And related test equipment or technology does not exist for performing related logic overhaul on the protection device by adopting FT3 message switching value acquisition. At present, the related overhaul verification of the domestic flexible direct current transmission engineering is mainly finished through laboratory simulation tests of scientific research institutions such as electric departments, and the like, and the non-related portable testing equipment is used for finishing the tasks such as the fixed inspection and the debugging of the flexible direct current protection device. On one hand, because the application of the digital FT3 message in the alternating-current transformer substation is limited, the construction application of the flexible direct-current transmission is still in an exploration stage, and related testing means are still in a development and research stage; on the other hand, because the flexible direct current digital FT3 message protocol is not standardized, the message acquisition and analysis have a certain technical difficulty.
Disclosure of Invention
The invention mainly aims to provide a flexible direct current protection test system based on FT3 message switching value position acquisition, which aims to overcome the problems.
In order to achieve the above purpose, the invention provides a flexible direct current protection test method based on FT3 message switching value position acquisition, which comprises the following steps:
s10, selecting a flexible direct current converter station FT3 protocol corresponding to the current test in the flexible direct current protection device;
s20, testing FT3 messages of analog voltage and current sampling of a system and FT3 messages of a switching value position of an operating state to a flexible direct current protection device;
s30, judging whether the voltage and current sampled by the flexible direct current protection device and the state of the switching value are normal or not according to the input voltage and current and the FT3 message of the switching position of the running state;
s40, if the test system is judged to be normal in S30, the test system outputs simulated flexible direct current faults to the flexible direct current protection device; if the judgment of S30 is negative, returning to S10;
s50, analyzing and detecting whether a tripping outlet in a switching value position in an acquisition FT3 message of the flexible direct current protection device is shifted or not in real time;
if the shift occurs in S60, the protection logic is normal, and the fault current output is stopped.
Preferably, the step of analyzing the FT3 packet in real time and acquiring the switch value position in S50 includes:
s501, acquiring FT3 message protocol;
s502, forming an FT3 message protocol database according to the acquired FT3 message protocol;
s503, the test system detects the position of the FT3 tripping outlet;
s504, matching is carried out on the FT3 protocol database according to the name of the logic device in the FT3 message;
s505, if the matching is successful, acquiring the trip outlet position of the flexible straight protection device FT 3; if the match fails to be made,
returning to S502, and updating the FT3 message protocol database.
Preferably, the step S60 further includes:
s70 records the output position fault current output time point T1, fault current stop output time point T2 and protection action output time |T2-T1|.
Preferably, the step S60 further includes: if there is no displacement, the process returns to S40.
Preferably, if the valve direct current protection test is performed, the flexible direct current protection test system simulates the valve direct current protection action equation as follows:
Max(I dP,I dN)>I_set
the method comprises the steps of simulating positive current I dP overcurrent, setting positive current output to be 1.2 times of the overcurrent threshold, setting a switching value outlet of a direct current overcurrent protection action blocking converter valve and an immediate tripping converter switch, changing the blocking converter valve switch from a split position to a combined position when the direct current overcurrent protection action is performed, acquiring a flexible direct current protection outlet FT3 message by utilizing a FT3 message detection and analysis function, immediately stopping fault current output when the FT3 message is detected and analyzed to correspond to the outlet position change, and simultaneously recording fault current output time T1 and fault current stop output time T2, wherein |T2-T1| is protection action outlet time.
The invention completes the system for testing the protection logic and the protection fixed value closed loop of the flexible direct current protection device by collecting and analyzing the trip outlet based on the FT3 message, and solves the problem that the flexible direct current control protection device cannot carry out the protection logic and the protection fixed value maintenance and verification on the site of the converter station.
Compared with the prior art, the invention has the beneficial effects that:
1. forming a flexible direct current protection device FT3 protocol data template library, realizing real-time acquisition and analysis of FT3 messages, and providing technical support for testing the flexible direct current protection device;
2. the FT3 message data can be acquired in real time and the message analysis is carried out according to the FT3 protocol data simulation library, so that the method has a certain help to locate the failure of interconnection and intercommunication of the FT3 messages between the flexible direct current protection devices, and the safety and reliability of the flexible direct current protection devices in field operation of the converter station are improved;
3. the real-time detection and analysis of the FT3 tripping outlet solves the current situation that the flexible direct current protection device cannot be debugged singly, realizes the automatic test of the flexible direct current protection device by simulating protection data sampling and detecting and analyzing the closed loop mode of the FT3 tripping outlet, and has a certain pushing effect on the development of a portable flexible direct current protection device testing instrument and the field overhaul test of the flexible direct current protection device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a flexible direct current protection test method based on FT3 message switching value position acquisition;
FIG. 2 is a flow chart of FT3 message collection and analysis according to the present invention;
FIG. 3 is a circuit diagram of FT3 message detection and analysis according to the present invention;
figure 4 is a schematic block diagram of a prior art flexible dc protection testing method,
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
As shown in fig. 1-2, the flexible direct current protection testing method based on FT3 message switching value position acquisition provided by the invention comprises the following steps:
s10, selecting a flexible direct current converter station FT3 protocol corresponding to the current test in the flexible direct current protection device;
s20, testing FT3 messages of the analog voltage and current sampling of the system and FT3 messages of the switching value position of the running state to a flexible direct current protection device;
s30, judging whether the voltage and current sampled by the flexible direct current protection device and the state of the switching value are normal or not according to the input voltage and current and the FT3 message of the switching position of the running state;
s40, if the test system is judged to be normal in S30, the test system outputs simulated flexible direct current faults to the flexible direct current protection device; if the judgment of S30 is negative, returning to S10;
s50, analyzing and detecting whether a tripping outlet in a switching value position in an acquisition FT3 message of the flexible direct current protection device is shifted or not in real time;
if the shift occurs in S60, the protection logic is normal, and the fault current output is stopped.
Preferably, the step of analyzing the FT3 packet in real time and acquiring the switch value position in S50 includes:
s501, acquiring FT3 message protocol;
s502, forming an FT3 message protocol database according to the acquired FT3 message protocol;
s503, the test system detects the position of the FT3 tripping outlet;
s504, matching is carried out on the FT3 protocol database according to the name of the logic device in the FT3 message;
s505, if the matching is successful, acquiring the trip outlet position of the flexible straight protection device FT 3; if the match fails to be made,
returning to S502, and updating the FT3 message protocol database.
Preferably, the step S60 further includes:
s70 records the output position fault current output time point T1, fault current stop output time point T2 and protection action output time |T2-T1|.
Preferably, the step S60 further includes: if there is no displacement, the process returns to S40.
Preferably, if the valve direct current protection test is performed, the flexible direct current protection test system simulates the valve direct current protection action equation as follows:
Max(I dP,I dN)>I_set
the method comprises the steps of simulating positive current I dP overcurrent, setting positive current output to be 1.2 times of the overcurrent threshold, setting a switching value outlet of a direct current overcurrent protection action blocking converter valve and an immediate tripping converter switch, changing the blocking converter valve switch from a split position to a combined position when the direct current overcurrent protection action is performed, acquiring a flexible direct current protection outlet FT3 message by utilizing a FT3 message detection and analysis function, immediately stopping fault current output when the FT3 message is detected and analyzed to correspond to the outlet position change, and simultaneously recording fault current output time T1 and fault current stop output time T2, wherein |T2-T1| is protection action outlet time.
In the examples of the present invention, the present invention is further illustrated:
1. FT3 message detection and analysis
And acquiring FT3 message communication protocols among different protection devices of the flexible direct current converter station, and manufacturing an FT3 protocol data template library through a relevant configuration tool, wherein the FT3 protocol data template library comprises various types of FT3 message communication protocols of the whole flexible direct current converter station. The testing system collects FT3 messages sent by the flexible direct current protection equipment through the optical fiber module, and separates out the logical equipment names of the FT3 messages. Each FT3 message has a unique logic device name, a corresponding FT3 protocol is automatically positioned in the FT3 protocol data template base through the logic device name, and the switching positions of different switching value channels are judged and analyzed according to the corresponding protocol. Only the acquired FT3 message is consistent with the FT3 protocol template library, the FT3 message can be correctly analyzed, and the FT3 message is the basis for ensuring FT3 data interconnection between the flexible direct current protection devices.
2. FT3 message detection circuit
As shown in FIG. 2, the FT3 message detection circuit adopts an AFBR-2418TZ light receiving module of Avago company, namely the number XS1. The power supply module is powered by a 3.3V power supply, and an LC filter circuit is adopted for eliminating harmonic interference. When the XS1 light receiving module receives the FT3 message, the digital signal of the FT3 message is converted into a weak signal high-low level through an internal circuit, the weak signal high-low level is connected to a I O N pin of the FPGA chip through a DO output pin, and the FT3 message is analyzed in real time through the FPGA chip.
3. Flexible direct current protection test based on FT3 switch position acquisition
The principle of protection sampling and monomer debugging of the flexible direct current protection device is shown in figure 1. The flexible direct current protection device collects voltage and current signals of the FT3 digital message and switching value position signals of the digital FT3 message. When the test system carries out single protection logic and protection fixed value maintenance test on the flexible direct current protection device, firstly, normal voltage and current signals and switch position signals are simulated, the flexible direct current protection device is ensured to sample normally, and the FT3 protocol in the FT3 protocol template library is verified to be consistent with the protocol adopted by the flexible direct current protection device. Then simulating a flexible direct current fault, taking valve direct current overcurrent protection as an example, and protecting an action equation:
Max(I dP,I dN)>I_set
wherein, I dP is the positive current, I dN is the negative current, and i_set is the overcurrent protection threshold.
The overcurrent of the positive current I dP is simulated, the output of the positive current is set to be 1.2 times of an overcurrent threshold value, and the direct current overcurrent protection action, the switching value outlets of the blocking converter valve and the immediate jump converter switch are adopted. When the direct current protection acts, the 'blocking converter valve' switch is changed from the split position to the closed position, the FT3 message detection and analysis function is utilized to obtain the flexible direct current protection outlet FT3 message, when the FT3 message is detected and analyzed to change the corresponding outlet position, the fault current output is immediately stopped, and meanwhile, the fault current output time T1 and the fault current stop output time T2 are recorded, wherein T2-T1 is the protection action outlet time. The overhaul and verification work of the protection logic, the protection fixed value and the protection outlet time of the flexible direct current protection device converter station on site is realized by utilizing the FT3 message switching value position acquisition and analysis, and the reliable operation of the flexible direct current converter station is greatly ensured.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (5)
1. A flexible direct current protection test method based on FT3 message switching value position acquisition is characterized by comprising the following steps:
s10, selecting a flexible direct current converter station FT3 protocol corresponding to the current test in the flexible direct current protection device;
s20, testing FT3 messages of the analog voltage and current sampling of the system and FT3 messages of the switching value position of the running state to a flexible direct current protection device;
s30, judging whether the voltage and current sampled by the flexible direct current protection device and the state of the switching value are normal or not according to the input voltage and current and the FT3 message of the switching position of the running state;
s40, if the test system is judged to be normal in S30, the test system outputs simulated flexible direct current faults to the flexible direct current protection device; if the judgment of S30 is negative, returning to S10;
s50, analyzing and detecting whether a tripping outlet in a switching value position in an acquisition FT3 message of the flexible direct current protection device is shifted or not in real time;
if the shift occurs in S60, the protection logic is normal, and the fault current output is stopped.
2. The flexible direct current protection test method based on FT3 message switching value position collection as claimed in claim 1, wherein the step of analyzing FT3 messages in real time and acquiring switching value positions in S50 comprises the steps of:
s501, acquiring FT3 message protocol;
s502, forming an FT3 message protocol database according to the acquired FT3 message protocol;
s503, the test system detects the position of the FT3 tripping outlet;
s504, matching is carried out on the FT3 protocol database according to the name of the logic device in the FT3 message;
s505, if the matching is successful, acquiring the trip outlet position of the flexible straight protection device FT 3; if the match fails to be made,
returning to S502, and updating the FT3 message protocol database.
3. The flexible dc protection testing method based on FT3 message switching value location acquisition of claim 1, wherein the step S60 further includes:
s70 records the output position fault current output time point T1, fault current stop output time point T2 and protection action output time |T2-T1|.
4. The flexible dc protection testing method based on FT3 message switching value location acquisition of claim 1, wherein S60 further includes: if there is no displacement, the process returns to S40.
5. The flexible direct current protection testing method based on FT3 message switching value position acquisition according to claim 1, wherein if the valve direct current protection test is performed, the flexible direct current protection testing system simulates a valve direct current protection action equation as follows:
Max(IdP,IdN)>I_set
the method comprises the steps of setting an output of positive current as 1.2 times of an overcurrent threshold value, setting a switching value outlet of a direct current overcurrent protection action blocking converter valve and an immediate tripping converter switch, changing the blocking converter valve switch from a split position to a closed position when the direct current overcurrent protection action is performed, acquiring a flexible direct current protection outlet FT3 message by utilizing a FT3 message detection and analysis function, immediately stopping fault current output when the FT3 message detection and analysis detects the corresponding outlet position change, and simultaneously recording a fault current output time T1 and a fault current stop output time T2, wherein |T2-T1| is protection action outlet time.
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| CN112491610B (en) * | 2020-11-25 | 2023-06-20 | 云南电网有限责任公司电力科学研究院 | FT3 message anomaly simulation test method for direct current protection |
| CN114371641B (en) * | 2021-12-02 | 2024-04-26 | 浙江省送变电工程有限公司 | Portable quick switch debugging device |
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