CN113791554B - Valve control system detection device and method for converter valve - Google Patents
Valve control system detection device and method for converter valve Download PDFInfo
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- CN113791554B CN113791554B CN202110984493.7A CN202110984493A CN113791554B CN 113791554 B CN113791554 B CN 113791554B CN 202110984493 A CN202110984493 A CN 202110984493A CN 113791554 B CN113791554 B CN 113791554B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The application relates to a valve control system detection device and method for a converter valve, comprising a logic processing circuit, a VBE state selection switch circuit and a single valve selection switch circuit, wherein the VBE state selection switch circuit and the single valve selection switch circuit are connected with the logic processing circuit, and the logic processing circuit is connected with the valve control system; the logic processing circuit is used for processing the VBE state signal according to the switch state of the VBE state selection switch circuit, obtaining the FCS signal according to the switch state of the single valve selection switch circuit, and outputting the VBE state signal and the FCS signal to the valve control system; the VBE state signal is used for switching the valve control state of the valve control system, the FCS signal is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve, the test efficiency of the thyristor level and the valve control system is greatly improved, the test time is shortened, the test range is enlarged, and the running reliability of core equipment of the converter station is ensured.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a valve control system detection device and method for a converter valve.
Background
With the rapid development of the electric power technology in China, a plurality of ultra-high voltage direct current transmission projects which are built at present enable the efficiency of trans-regional long-distance power transmission and power utilization to be greatly improved. In such extra-high voltage direct current transmission systems, the rectifying and inverting processes are combined in one converter station, and are completed by changing the triggering angle of a high voltage direct current converter valve of a core device, wherein the triggering angle of the converter valve is controlled by switching the valve control states of a valve control system (Valve Base Electronics, VBE) and outputting triggering signals. The valve control system is used as a control center of the operation of the converter valve and plays a role in triggering the converter valve and monitoring the operation state.
At present, valve control state switching and trigger signal output of a valve control system are generally controlled by a pole control background of an extra-high voltage direct current converter station in a software setting mode. However, when the extra-high voltage direct current converter station is overhauled and troubleshooted, the pole control background can automatically switch the valve control state to an undervoltage state, namely, the voltage state of the thyristor of the converter valve is forbidden to be monitored and the triggering instruction outlet of the thyristor is forbidden, so that the overhauling cannot be performed, and the valve control state is required to be manually switched to an unlocking state from the pole control background to carry out overhauling test. However, the software setting rule of the pole control background is complex, the number of corresponding state holes to be adjusted is huge, time is consumed, the error rate is high, serious consequences can be caused if the disconnecting link of the electrified loop is set by mistake, and great potential safety hazards exist.
Disclosure of Invention
Accordingly, it is necessary to provide a valve control system detection device and method for a converter valve, which solve the problem that the valve control state of the valve control system cannot be quickly switched during maintenance.
A valve control system detection device for a converter valve, comprising: the system comprises a logic processing circuit, a VBE state selection switch circuit and a single valve selection switch circuit, wherein the VBE state selection switch circuit and the single valve selection switch circuit are connected with the logic processing circuit, and the logic processing circuit is connected with a valve control system;
the logic processing circuit obtains a VBE state signal according to the switch state processing of the VBE state selection switch circuit, obtains an FCS signal according to the switch state processing of the single valve selection switch circuit, and outputs the VBE state signal and the FCS signal to the valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve.
In one embodiment, the VBE state selection switch circuit includes more than two VBE state selection switches, and each VBE state selection switch is connected to the logic processing circuit.
In one embodiment, the single valve selection switch circuit comprises more than two single valve selection switches, and each single valve selection switch is connected with the logic processing circuit.
In one embodiment, the logic processing circuit includes a logic processing chip that connects the VBE state selection switch circuit, the single valve selection switch circuit, and the valve control system.
In one embodiment, the logic processing chip is an FPGA chip.
In one embodiment, the valve control system detection device for a converter valve further includes a phase selection switch circuit, the phase selection switch circuit is connected with the logic processing circuit, and the logic processing circuit processes the FCS signal together according to a switching state of the single valve selection switch circuit and a switching state of the phase selection switch circuit.
In one embodiment, the phase selection switch circuit comprises three phase selection switches, and each phase selection switch is connected with the logic processing circuit.
In one embodiment, the valve control system detection device for a converter valve further comprises a level conversion circuit, and the logic processing circuit is connected with the valve control system through the level conversion circuit.
In one embodiment, a method for detecting a valve control system for a converter valve is provided, which is implemented based on the valve control system detection device for a converter valve and includes:
the method comprises the steps of selecting a switch state of a switch circuit according to a VBE state to obtain a VBE state signal;
the FCS signal is obtained according to the switching state processing of the single valve selection switching circuit;
outputting the VBE status signal and the FCS signal to a valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve.
In one embodiment, the processing according to the switching state of the single valve selection switch circuit to obtain the FCS signal includes:
and processing the switching state of the single valve selection switching circuit and the switching state of the phase selection switching circuit together to obtain the FCS signal.
According to the valve control system detection device for the converter valve, the VBE state signal is output through the logic processing circuit to complete the rapid switching of the valve control state, and then the FCS signal is output to control the triggering signal output of the valve control system, so that the triggering function test of the valve control system on the thyristor level in the converter valve is completed, the testing efficiency of the thyristor level and the valve control system is greatly improved, the testing time is shortened, the testing range is enlarged, and the operation reliability of core equipment of a converter station is ensured.
Drawings
FIG. 1 is a system block diagram of a valve control system detection device for a converter valve in an embodiment;
FIG. 2 is a flow chart of a method for detecting a valve control system for a converter valve according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
The converter valve is a core device in a direct current converter station of a direct current transmission system with high voltage and extra-high voltage, a damping loop, a triggering short optical cable, a TVM board card, a large number of thyristor stages and other components are arranged in a valve hall, and a control room comprises a valve control system for triggering and monitoring actions of the thyristor stages and a return optical cable thereof. At present, valve control state switching and trigger signal output of a valve control system are generally controlled by a pole control background of a direct current converter station in a software setting mode.
When the direct current converter station is overhauled or troubleshooted, the pole control background can automatically switch the valve control state to an undervoltage state, namely, the voltage state of the thyristor level is forbidden to be monitored and the trigger signal outlet of the thyristor level is forbidden, so that the overhauling can not be performed, and the valve control state is manually switched to an unlocking state from the pole control background to carry out overhauling test. However, the software setting rule of the pole control background is complex, the number of corresponding state holes to be adjusted is huge, time is consumed, the error rate is high, serious consequences can be caused if the disconnecting link of the electrified loop is set by mistake, and great potential safety hazards exist.
In addition, the maintenance process should perform functional tests on each component in each converter valve as much as possible under the condition of ensuring that the direct current converter station equipment is not affected. In the existing detection equipment, only the components in the valve hall of the converter valve are subjected to functional test, and the functional test of the valve control system and the return optical cable thereof is not involved. In addition, the test efficiency of the existing detection equipment is low to seriously influence the maintenance time of the direct current converter station in the face of a huge number of thyristor-level trigger tests.
Therefore, in one embodiment, a valve control system detection device for a converter valve is provided to replace a pole control background to control valve control state switching and trigger signal output of the valve control system in the maintenance process. As shown in fig. 1, the device according to the present embodiment includes: the logic processing circuit 110, the VBE state selection switch circuit 120 and the single valve selection switch circuit 130 are connected with the logic processing circuit 110, and the logic processing circuit 110 is connected with a valve control system; the logic processing circuit 110 processes the VBE state signal according to the switch state of the VBE state selection switch circuit 120, the logic processing circuit 110 processes the VBE state signal according to the switch state of the single valve selection switch circuit 130 to obtain an FCS signal, and the logic processing circuit 110 outputs the VBE state signal and the FCS signal to the valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve.
Specifically, the valve control system of the converter valve comprises a main control unit (Microcontroller module), a light emitting unit (Lightemitter module) and a light receiving unit (Lightreceiver module). The main control unit is used for receiving the control of the pole control background to finish switching the valve control state and outputting a trigger signal, the light emitting unit is used for outputting the trigger signal to a thyristor stage in a valve hall of the converter valve through an optical cable, and the light receiving unit is used for receiving a voltage return signal from the thyristor stage sent back by the TVM board card through a return optical cable and then transmitting the voltage return signal to the valve control system to finish the task of triggering and monitoring the thyristor stage. It will be appreciated that the logic processing circuit 110 is configured to connect to a master control unit of the valve control system and control the switching of the valve control states and the output of the trigger signals of the valve control system.
In one aspect, the logic processing circuit 110 processes the VBE state of the VBE state selection switch circuit 120 to obtain a VBE state signal, and then sends the VBE state signal to a main control unit of the valve control system, where the main control unit completes the valve control state switching according to the VBE state signal. It is understood that different VBE status signals correspond to different valve control states of the valve control system. In the current converter valve of the direct current transmission system, the valve control state of the valve control system mainly comprises four types: an undervoltage state (underwriter_voltage), a blocked state (Block), an unblocked state (Deblock), and a cast bypass pair state (by_pass). Correspondingly, the VBE status signal also includes an undervoltage status signal, a locked status signal, an unlocked status signal, and a cast bypass pair status signal. Wherein the VBE state signal is determined by the switch state of the VBE state selection switch circuit 120, it is understood that the switch state of the VBE state selection switch circuit 120 also includes an undervoltage switch state, a latch switch state, an unlock switch state, and a bypass switch state. When overhauling or troubleshooting is performed, the VBE state selection switch circuit 120 is only required to be switched to a corresponding switch state, and a VBE state signal is output to the main control unit of the valve control system, so that the valve control state switching of the valve control system can be correspondingly completed.
On the other hand, the logic processing circuit 110 processes the switching state of the single valve selection switching circuit 130 to obtain a FCS (FieldBus Contorl Syestem) signal, and then sends the FCS signal to the main control unit of the valve control system, and the main control unit outputs a trigger signal to the thyristor stage through the optical transmitting unit according to the FCS signal, so as to complete the trigger function test of the thyristor stage of the converter valve. In general, the converter valve is formed by connecting two three-phase rectifier bridges in parallel, and each bridge arm of the rectifier bridges is formed by connecting a plurality of thyristor stages in series. Then, when the trigger function test of the corresponding thyristor stage is completed, the trigger signal needs to be correspondingly output according to the position of the thyristor stage, correspondingly, the FCS signal also needs to include the position information of the corresponding thyristor stage, and the single-valve selection switch circuit 130 also needs to perform the switch state after setting according to the corresponding position. In addition, the FCS signal output by the logic processing circuit 110 is a periodic pulse signal, and the main control unit of the valve control system outputs a trigger signal to the thyristor stage at the rising edge time of the FCS signal, so as to complete the trigger function test of the thyristor stage of the converter valve.
It can be understood that, when overhauling or troubleshooting is performed, the switch state of the VBE state selection switch circuit 120 is set to the unlock switch state, and the logic processing circuit 110 outputs a VBE state signal that is an unlock state signal according to the switch state of the VBE state selection switch circuit 120, so that the valve control system of the converter valve is switched from the undervoltage state to the unlock state, and the trigger signal of the thyristor stage can be normally output. And setting the single valve selection switch circuit 130 corresponding to the position of the thyristor stage according to the overhaul or fault investigation requirement, processing the FCS signal obtained by the logic processing circuit 110 according to the switch state of the single valve selection switch circuit 130, and sending the FCS signal to a valve control system, and outputting a trigger signal by a main control unit at the rising edge moment of the FCS signal to complete the thyristor stage trigger function test of the corresponding position. Then, when the main control unit detects the voltage return signal of the thyristor level returned by the return optical cable, the thyristor level trigger function at the corresponding position is proved to be normal.
In one embodiment, the VBE state selection switch circuit 120 and the single valve selection switch circuit 130 both output switch states according to a predetermined switch state table. The preset switch state table of the valve control states characterizes the switch states of the VBE state selection switch circuits 120 corresponding to all valve control states, and the preset switch state table of the trigger signals characterizes the switch states of the single valve selection switch circuits 130 corresponding to all positions when the thyristor stages are triggered. In this embodiment, for all the situations to be tested, a preset switch state table is correspondingly provided, so that the maintenance process becomes simple, the efficiency is improved, and the maintenance process can be completed without professional personnel.
According to the valve control system detection device for the converter valve, the VBE state signal is output through the logic processing circuit 110 to complete the rapid switching of the valve control state, then the FCS signal is output to control the triggering signal output of the valve control system, so that the triggering function test of the valve control system on the thyristor level in the converter valve is completed, the testing efficiency of the thyristor level and the valve control system is greatly improved, the testing time is shortened, the testing range is enlarged, and the operation reliability of core equipment of a converter station is ensured.
In one embodiment, as shown in FIG. 1, VBE state selection switch circuit 120 includes more than two VBE state selection switches, each VBE state selection switch being connected to logic processing circuit 110.
Specifically, the switching state of the VBE state selection switch circuit 120 is determined by the switching state of each VBE state selection switch. The number of VBE state selection switches is not unique, and may be determined according to the structure of the main control unit in the valve control system during actual use. For example, since the valve control system in the present embodiment determines the valve control state after logic processing by the 7-way polar control signal output by the polar control background, the number of VBE state selection switches is also set to 7. The 7 VBE state selection switches are all connected to the logic processing circuit 110, and the logic processing circuit 110 obtains a VBE state signal according to the switch states of the 7 VBE state selection switches. The following table shows a preset switch state table of the corresponding valve control state:
wherein, the pole control signal corresponds to the switch state of 7 VBE state selection switches, 1 represents setting, 0 represents unsetting, and x represents being capable of being at any position. It will be appreciated that when the valve control state needs to be adjusted to the unlock state, the second VBE state selection switch, the fourth VBE state selection switch and the sixth VBE state selection switch are set.
In this embodiment, the quick switching of the valve control state is completed by correspondingly setting the VBE state selection switch according to the preset switch state table and then outputting the VBE state signal.
In one embodiment, as shown in FIG. 1, the single valve selector switch circuit 130 includes more than two single valve selector switches, each of which is coupled to the logic processing circuit 110.
Specifically, the on-off state of the single-valve selection switch circuit 130 is determined by the on-off state of each single-valve selection switch. The number of the single valve selection switches is not unique, and can be determined according to the number of converter valve bridge arms in actual use. For example, in this embodiment, the converter valve formed by connecting two three-phase rectifier bridges in parallel generally has 12 bridge arms, the specific triangle bridge includes D1 to D6 bridge arms, and the star bridge includes Y1 to Y6 bridge arms. Each bridge arm is formed by connecting a plurality of thyristor stages in series (taking 500kVz direct-current transmission engineering as an example, one bridge arm is formed by connecting 78 thyristor stages in series). Since the thyristor stages on each bridge arm are all simultaneously conductive, it can be appreciated that the opposite bridge arms on the rectifier bridge are simultaneously conductive during operation. Therefore, the number of the corresponding single-valve selection switches can be consistent with that of the bridge arms, one single-valve selection switch can set the thyristor level on one bridge arm, and then trigger test of the thyristor level to be tested is realized by setting the corresponding single-valve selection switches of the opposite bridge arms at the same time. Of course, the number of the single-valve selection switches can be half of the number of the bridge arms, and one single-valve selection switch can be set relative to the thyristor stage on the bridge arm to realize the trigger test of the thyristor stage to be tested.
In this embodiment, the number of single-valve selector switches is 12, which is consistent with the number of bridge arms. The 12 single valve selection switches are all connected with the logic processing circuit 110, and the logic processing circuit 110 obtains an FCS signal according to the switching states of the 12 single valve selection switches. The following table shows a preset switch state table of the corresponding trigger signal, and when the thyristor level on the Y1 bridge arm needs to be tested, the Y1 single valve selection switch and the Y4 single valve selection switch need to be set at the same time, and the following steps are repeated.
In the embodiment, the triggering of the thyristor level at the target position is completed by correspondingly setting the single valve selection switch according to the preset switch state table and then outputting the FCS signal, so that the testing efficiency of the thyristor level is greatly improved, and the testing time is shortened.
In one embodiment, the logic processing circuit 110 includes a logic processing chip that is coupled to the VBE state selector switch circuit 122, the single valve selector switch circuit 130, and the valve control system.
Specifically, the logic processing chip in the logic processing circuit 110 performs internal logic processing to output a VBE state signal according to the received switch state of the 7-way VBE state selection switch, and then sends the VBE state signal to the valve control system for switching the valve control state. In addition, the logic processing chip in the logic processing circuit 110 performs internal logic processing to output an FCS signal to the valve control system for outputting a trigger signal to the converter valve according to the switching state of the 12-way single-valve selection switch. The FCS signal output by the logic processing chip is a periodic pulse signal, and the pulse width and period are not unique, and in this embodiment, the pulse width of the FCS signal is 6.67ms, and the period is 20ms. In one embodiment, the logic processing chip is a FPGA (Field Programmable Gate Array) chip. Specifically, the type of the FPGA chip used is not unique, and in this embodiment, the type used is XC2C256-7VQ100I. The FPGA chip can effectively adopt devices such as a gate circuit and the like to solve the logic operation process in the scheme, and has high integration level.
In one embodiment, as shown in fig. 1, the valve control system detection device for a converter valve further includes a phase selection switch circuit 140, where the phase selection switch circuit 140 is connected to the logic processing circuit 110, and the logic processing circuit 110 processes the FCS signal according to the switching state of the single valve selection switch circuit 130 and the switching state of the phase selection switch circuit 140.
Specifically, the valve control system is generally arranged in a VBE control room of the converter station, often far away from a valve hall where the converter valve is located, and it is quite possible that power sources adopted by the valve control system and the valve hall are output from different secondary sides of a transformer in the converter station, so that the problem that the phase of the power source of a thyristor stage on the converter valve in the valve hall is asynchronous is caused. When the trigger test of the thyristor stage is performed, the phase selection switch circuit 140 adjusts the phase of the FCS signal output by the logic processing circuit 110 according to the switching state of the single valve selection switch circuit 130, so that the valve control system can send a trigger signal to the thyristor stage to be tested at a proper time according to the FCS signal after receiving the phase adjustment, and the trigger test of the thyristor stage is completed.
In one embodiment, phase selection switch circuit 140 includes three phase selection switches, each phase selection switch coupled to logic processing circuit 110. Specifically, in general ac power sources, each of the ac power sources includes A, B and C phases, and correspondingly, the phase selection switch circuit 140 includes a first phase selection switch, a second phase selection switch, and a third phase selection switch. The first phase selection switch, the second phase selection switch and the third phase selection switch are all connected with the logic processing circuit 110, and when the first phase selection switch is set, the logic processing circuit 110 delays the phase of the output FCS signal by 30 degrees; when the second phase selection switch is set, the logic processing circuit 110 delays the phase of the output FCS signal by 150 °; when the third phase selection switch is set, the logic processing circuit 110 delays the phase of the output FCS signal by 270 °.
In this embodiment, the phase selection switch circuit is used to perform phase adjustment on the output FCS signal, so as to ensure that the trigger test can be accurately completed when the voltage of the thyristor stage is in any phase.
In one embodiment, as shown in fig. 1, the valve control system detection device for a converter valve further includes a level shifter 150, and the logic processing circuit 110 is connected to the valve control system through the level shifter 150. Specifically, the level conversion circuit 150 includes a level conversion chip, and the VBE state signal and the FCS signal of the low amplitude voltage output by the logic processing circuit 110 are boosted by the level conversion chip and then output to the main control unit of the valve control system. For example, in this embodiment, the level conversion chip boosts the VBE state signal and the FCS signal of 3.3V to 24V and outputs the boosted signals to the main control unit of the valve control system. In addition, the type of the level shift chip is not unique, and may be any level shift function, and in this embodiment, the type of the level shift chip used is a UC2709DW chip.
In one embodiment, the valve control system detection device for a converter valve includes a panel and a base, each VBE state selection switch, each single valve selection switch and each phase selection switch are all disposed on the panel, the logic processing circuit and the level conversion circuit are all disposed in the base, the logic processing circuit is connected to each VBE state selection switch, each single valve selection switch and each phase selection switch on the panel, and the logic processing circuit is further connected to the valve control system through the level conversion circuit. In addition, the panel is also provided with a preset switch state table of a valve control state and a preset switch state table of a trigger signal, and the specific setting mode is not only that an electronic screen is arranged on the panel for displaying, the electronic screen can be printed on paper to be attached to the panel, or the electronic screen can be directly carved on the panel, and the electronic screen is not limited. Specifically, each VBE state selection switch, each single valve selection switch and each phase selection switch are all manual switching devices, and when overhauling, operation and maintenance personnel can manually set the selection switches according to a preset switch state table arranged on a panel, so that the switching of the valve control state of the valve control system and the trigger test of the thyristor level are realized. The corresponding operation can be completed without professional knowledge support, so that the test efficiency of the thyristor level and the valve control system is greatly improved, the test time is shortened, the test range is enlarged, and the running reliability of core equipment of the converter station is ensured.
In one embodiment, as shown in fig. 2, a method for detecting a valve control system for a converter valve is provided, which is implemented based on the above-mentioned valve control system detection device for a converter valve, and includes steps S110 to S130.
Step S110: and processing the switch state of the switch circuit according to the VBE state to obtain a VBE state signal.
Specifically, in the current converter valve of the dc power transmission system, the valve control states of the valve control system mainly include four types: an undervoltage state (underwriter_voltage), a blocked state (Block), an unblocked state (Deblock), and a cast bypass pair state (by_pass). Correspondingly, the VBE status signal also includes an undervoltage status signal, a locked status signal, an unlocked status signal, and a cast bypass pair status signal. The VBE state signal is determined by a switch state of the VBE state selection switch circuit, and it is understood that the switch state of the VBE state selection switch circuit also includes an undervoltage switch state, a latch switch state, an unlock switch state, and a bypass switch state. When overhauling or troubleshooting is performed, the VBE state selection switch circuit is switched to the corresponding switch state, and a VBE state signal is output to the main control unit of the valve control system, so that the valve control state switching of the valve control system can be correspondingly completed. The VBE state selection switch circuit can complete the operation by setting the VBE state selection switch circuit correspondingly according to a preset switch state table of the valve control state.
Step S120: and processing according to the switching state of the single valve selection switching circuit to obtain the FCS signal.
Specifically, the logic processing circuit processes and obtains the FCS signal according to the switch state of the single valve selection switch circuit. In general, the converter valve is formed by connecting two three-phase rectifier bridges in parallel, and each bridge arm of the rectifier bridges is formed by connecting a plurality of thyristor stages in series. When the trigger function test of the corresponding thyristor stage is completed, the trigger signal needs to be correspondingly output according to the position of the thyristor stage, correspondingly, the FCS signal also needs to contain the position information of the corresponding thyristor stage, and the single-valve selection switch circuit also needs to be in a switch state after being set according to the corresponding position. In addition, the FCS signal output by the logic processing circuit is a periodic pulse signal, and the main control unit of the valve control system outputs a trigger signal to the thyristor stage at the rising edge moment of the FCS signal to complete the trigger function test of the thyristor stage of the converter valve.
Step S130: outputting the VBE status signal and the FCS signal to a valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve.
Specifically, the logic processing circuit outputs a VBE state signal which is an unlocking state signal according to the switch state of the VBE state selection switch circuit, so that the converter valve control system is switched from an undervoltage state to an unlocking state, and a trigger signal of a thyristor level can be normally exported. When the valve control system detects the voltage return signal of the thyristor level returned by the return optical cable, the valve control state is proved to be switched to the unlocking state. Setting a single valve selection switch circuit corresponding to the position of the thyristor stage according to the overhaul or fault investigation requirement, processing by a logic processing circuit according to the switch state of the single valve selection switch circuit to obtain an FCS signal, sending the FCS signal to a main control unit of a valve control system, and outputting a trigger signal to the thyristor stage at the rising edge moment of the FCS signal according to the FCS signal by a light emitting unit by the main control unit to complete the thyristor stage trigger function test of the corresponding position.
In one embodiment, as shown in fig. 2, when the valve control system detection device for a converter valve includes a phase selection switch circuit, step S120 includes step S121.
Step S121: and processing the switching state of the single valve selection switch circuit and the switching state of the phase selection switch circuit together to obtain an FCS signal.
Specifically, the valve control system is generally arranged in a VBE control room of the converter station, often far away from a valve hall where the converter valve is located, and it is quite possible that power sources adopted by the valve control system and the valve hall are output from different secondary sides of a transformer in the converter station, so that the problem that the phase of the power source of a thyristor stage on the converter valve in the valve hall is asynchronous is caused. When the trigger test of the thyristor stage is carried out, the phase selection switch circuit is used for carrying out phase adjustment on the FCS signal output by the logic processing circuit according to the switching state of the single valve selection switch circuit, so that the valve control system can send a trigger signal to the thyristor stage to be tested at a proper moment according to the FCS signal after receiving the phase adjustment, and the trigger test of the thyristor stage is completed.
The specific limitation of the detection method of the valve control system for the converter valve can be referred to as the limitation of the detection device of the valve control system for the converter valve, and the description thereof is omitted herein.
In the embodiment, the logic processing circuit outputs the VBE state signal to complete the rapid switching of the valve control state, and then outputs the FCS signal to control the trigger signal output of the valve control system so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve, thereby greatly improving the test efficiency of the thyristor level and the valve control system, shortening the test time, expanding the test range and ensuring the operation reliability of the core equipment of the converter station.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A valve control system detection device for a converter valve, comprising: the system comprises a logic processing circuit, a VBE state selection switch circuit, a single valve selection switch circuit and a phase selection switch circuit, wherein the VBE state selection switch circuit, the single valve selection switch circuit and the phase selection switch circuit are connected with the logic processing circuit, and the logic processing circuit is connected with a valve control system;
the logic processing circuit is used for processing the switching state of the VBE state selection switch circuit to obtain a VBE state signal, the logic processing circuit is used for adjusting the phase of the FCS signal obtained by processing the switching state of the single valve selection switch circuit according to the switching state of the phase selection switch circuit, and the logic processing circuit is used for outputting the VBE state signal and the FCS signal subjected to phase adjustment to the valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal after phase adjustment is used for controlling the valve control system to output a trigger signal to a converter valve so as to complete the trigger function test of the valve control system on a thyristor level in the converter valve; different VBE status signals correspond to different valve states of the valve control system.
2. The valve control system detection device for a converter valve according to claim 1, wherein the VBE state selection switch circuit includes two or more VBE state selection switches, and each of the VBE state selection switches is connected to the logic processing circuit.
3. The valve control system detection device for a converter valve according to claim 1, wherein the single valve selector switch circuit includes two or more single valve selector switches, each of which is connected to the logic processing circuit.
4. The valve control system detection device for a converter valve according to claim 1, wherein the logic processing circuit includes a logic processing chip, and the logic processing chip is connected to the VBE state selection switch circuit, the single valve selection switch circuit, and the valve control system.
5. The valve control system detection device for a converter valve according to claim 4, wherein the logic processing chip is an FPGA chip.
6. The valve control system detection device for a converter valve according to claim 1, wherein the phase selection switch circuit includes three phase selection switches, each of which is connected to the logic processing circuit.
7. The valve control system detection device for a converter valve according to claim 1, further comprising a level shift circuit, wherein the logic processing circuit is connected to the valve control system through the level shift circuit.
8. The valve control system detection device for a converter valve according to claim 7, wherein the level conversion circuit includes a level conversion chip that boosts the VBE state signal and the phase-adjusted FCS signal output from the logic processing circuit and outputs the boosted VBE state signal and the phase-adjusted FCS signal to the valve control system.
9. The valve control system detection device for a converter valve according to claim 1, wherein the switching states of the VBE state selection switching circuit include an undervoltage switching state, a latching switching state, an unlocking switching state, and a bypass-on switching state.
10. A method for detecting a valve control system for a converter valve, characterized in that the method is realized based on the valve control system detection device for a converter valve according to any one of claims 1 to 9, comprising:
the method comprises the steps of selecting a switch state of a switch circuit according to a VBE state to obtain a VBE state signal;
the FCS signal is obtained according to the switching state processing of the single valve selection switching circuit;
adjusting the phase of the FCS signal according to the switching state of the phase selection switching circuit;
outputting the VBE state signal and the FCS signal subjected to phase adjustment to a valve control system; the VBE state signal is used for switching the valve control state of the valve control system, and the FCS signal after phase adjustment is used for controlling the valve control system to output a trigger signal to the converter valve so as to complete the trigger function test of the valve control system on the thyristor level in the converter valve.
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