CN112366825A - Switching-on logic optimization method for switch in incoming line of converter transformer - Google Patents
Switching-on logic optimization method for switch in incoming line of converter transformer Download PDFInfo
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- CN112366825A CN112366825A CN202011292507.0A CN202011292507A CN112366825A CN 112366825 A CN112366825 A CN 112366825A CN 202011292507 A CN202011292507 A CN 202011292507A CN 112366825 A CN112366825 A CN 112366825A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005457 optimization Methods 0.000 title claims description 7
- 230000001934 delay Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2213/00—Indexing scheme relating to details of circuit arrangements for providing remote indication of network conditions of for circuit arrangements for providing remote control of switching means in a power distribution network
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- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The application relates to the technical field of high-voltage direct-current transmission control protection, wherein an incoming line switch closing command is sent to a middle switch, whether the closing allowable state of the middle switch is 1 needs to be judged, whether the three-trip tripping of the converter transformer protection is 0 or not is additionally judged on the basis of the existing logic, whether the closing state of a side switch is 1 or not is judged, and whether a pole control system receives an ESOF signal is judged. According to the method and the device, after the direct-current transmission pole control system or the transformer equipment fails, the blocking and closing process is effectively interrupted, and the correctness of sequential control of the converter transformer incoming line breaker is guaranteed.
Description
Technical Field
The application relates to the technical field of high-voltage direct-current transmission control protection, in particular to a switch closing logic optimization method in a converter transformer incoming line.
Background
The pole control system is the most important system for high-voltage direct-current transmission. The pole control mainly has the function of controlling a direct current transmission pole, and the purpose of stabilizing direct current voltage and realizing system power transmission is achieved by adjusting trigger angles of a rectification side and an inversion side according to the current running condition.
When the direct current transmission pole control system is operated to be in a locking state from a standby state, the pole control system sends a closing command to the alternating current station control through network communication, and the closing commands of the side switch and the middle switch are sent out simultaneously. Under normal conditions, after receiving a pole control closing converter transformer incoming line breaker command, an alternating current station controller firstly sends a closing edge switch command, and then sends a closing in switch command after 200ms delay.
In the existing switch closing logic, after a closing command is sent to a switch body, the closing operation can be completed only if three conditions of closing permission of alternating-current station control, successful phase detection of an interface device and successful phase selection of a phase selection closing device are met. However, if a fault occurs in the switching-on process of the side switch during the sequential control operation, which causes the converter transformer protection action, the converter transformer protection action has successfully triggered the direct current ESOF command, and the sequential control logic should be reliably stopped according to the control requirement. For the middle switch, as the closing permission condition of the middle switch is met, the sequence control executes the standby-locking command according to the sequence control of the alternating-current station control, and the sequence control continues to complete closing of the middle switch according to the flow, but closing of the middle switch is meaningless for a system in an emergency shutdown control state, so that the existing pole control sequence control is single in logic, and closing of the middle switch cannot be interrupted in time in one occasion.
Disclosure of Invention
The application provides a switch-on logic optimization method in a converter transformer incoming line, which aims to solve the problem that the existing pole control sequence control logic is difficult to effectively interrupt switch-on of a middle switch under emergency shutdown control.
The technical scheme adopted by the application is as follows:
a switching-on logic optimization method for a switch in a converter transformer incoming line comprises the following steps:
the method comprises the steps that a closing line switch command is sent to a middle switch, whether the closing permission state of the middle switch is 1 or not is judged, and whether the closing permission state of the middle switch is 1 or not is judged, wherein whether an electrode control system receives an ESOF signal or not is judged;
if the pole control system does not receive the ESOF signal and delays for a preset time, the open-close allowable state of the middle switch is 1;
when the closing permission state of the middle switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection switching-on device is successful;
and if the phase selection of the phase selection switching-on device is successful, the switching-on and switching-off of the switch are allowed, and the switch finishes the switching-on operation.
Further, judging whether the closing permission state of the intermediate switch is 1 further comprises judging whether the tripping three-trip switching-in state of the converter transformer protection is 0:
before the pole control system is judged to receive the ESOF signal, whether the three-trip-in state of the converter transformer protection trip is 0 or not is judged, and if the three-trip-in state of the converter transformer protection trip is 0, whether the pole control system receives the ESOF signal or not is judged.
Further, determining whether the closing permission state of the middle switch is 1 further includes determining whether the closing state of the side switch is 1:
before the judgment of whether the three-trip-in state of the converter transformer protection trip is 0 or not, judging whether the closing state of the side switch is 1 or not, and if the closing state of the side switch is 1, judging whether the three-trip-in state of the converter transformer protection trip is 0 or not.
Further, judging whether the closing permission state of the intermediate switch is 1 further comprises judging whether the intermediate switch is in a fault-free state and the opening state is 1:
before judging whether the closing state of the side switch is 1, judging whether the middle switch is in a fault-free state and whether the opening state is 1;
and when the middle switch is in a fault-free state and the opening state is 1, judging whether the closing state of the side switch is 1 or not.
Further, the switching-on process of the side switch comprises: the closing incoming line switch command is sent to the side switch, whether the closing permission state of the side switch is 1 or not is judged, and whether the closing permission state of the side switch is 1 or not is judged, wherein judging whether the side switch is in a fault-free state and whether the opening state is 1 or not is included;
if the side switch is in a fault-free state and the switching-off state is 1, namely the switching-on allowable state of the side switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection switching-on device is successful or not;
and if the phase selection of the phase selection closing device is successful, closing the side switch, wherein the closing state of the side switch is 1.
Furthermore, the closing incoming line switch command is sent to the side switch firstly, and after 200ms delay, the closing incoming line switch command is sent to the middle switch.
The technical scheme of the application has the following beneficial effects:
according to the method, the switching-on logic judgment condition of the middle switch is added, whether the pole control system receives the ESOF signal or not is judged on the basis of the existing switching-on logic of the switch, and the middle switch switching-on permission condition is met only when the pole control system does not receive the ESOF signal, so that the middle switch switching-on can be effectively interrupted under the condition that the direct-current transmission pole control system fails;
the method also comprises the step of judging whether the three-trip-in state of the converter transformer protection trip is 0 or not, wherein the middle switch closing permission condition is met only when the three-trip-in state of the converter transformer protection trip is 0, and the middle switch closing can be effectively interrupted when the transformer equipment breaks down;
the method also adds the step of judging whether the switching-on state of the side switch is 1, the switching-on and switching-off allowing condition of the middle switch is met only when the switching-on state of the side switch is 1, and the middle switch can not perform meaningless switching-on action any more when the switching-on of the side switch is not completed, so that the pole control sequence control operation logic is greatly improved, the correctness of the sequence control of the converter transformer incoming line breaker is ensured, and the stable operation of a power grid is ensured.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a conventional pole-controlled sequential switching operation;
fig. 2 is a flowchart of a method for optimizing switching-on logic of a switch in an incoming line of a converter transformer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.
Referring to fig. 1, a flow chart of an existing pole control sequence control closing operation is shown. Referring to fig. 1, after receiving a pole control closing converter transformer incoming line breaker command, the ac station controller first issues a closing side switching command, and then issues a closing side switching command after a 200ms delay. In the existing switch closing logic, after a closing command is sent to a switch body, the closing operation can be completed only if three conditions of switch closing permission, successful phase detection of an interface device and successful phase selection of a phase selection closing device are all met. And whether the switch is switched on or not is allowed to only comprise whether the switch is in a fault-free and switching-off state or not, and the logic judgment is single.
Referring to fig. 2, a flow chart of a method for optimizing switching-on logic of a switch in an incoming line of a converter transformer is provided.
Detailed description of the preferred embodiment
The application provides a switch closing logic optimization method in a converter transformer incoming line, which comprises the following steps:
and sending a closing line switch command to a middle switch, judging whether the closing allowable state of the middle switch is 1, and judging whether the closing allowable state of the middle switch is 1 comprises judging whether an electrode control system receives an ESOF signal. The ESOF signal comes from the DC emergency shutdown control, which is the highest level of control and can be generated by a protective action or manually activated. When a converter transformer or the whole direct current system has faults, the pole control system receives an ESOF signal.
If the pole control system does not receive the ESOF signal and delays for a preset time, the open-close allowable state of the switch is 1. The preset time is determined according to the running condition of the system.
If the closing permission state of the middle switch is 1, judging whether the checking period of the interface device is qualified or not;
if the detection period of the interface device is qualified, whether the phase selection of the phase selection switching-on device is successful is judged, if the phase selection of the phase selection switching-on device is successful, the switching-on and switching-off of the switch are allowed, and the switch-on operation of the switch is completed.
Whether the on-off allowable state of a middle switch in the existing on-off logic is 1 only comprises judging whether the middle switch is in a fault-free and off-off state. The specific embodiment is that a logic judgment condition is added on the basis of the existing closing logic: and judging whether the pole control system receives the ESOP signal or not.
Detailed description of the invention
On the basis of the first specific embodiment, the determining whether the closing permission state of the intermediate switch is 1 further includes determining whether a trip three-trip-in state of the converter transformer protection is 0:
before the pole control system is judged to receive the ESOF signal, whether the three-trip-in state of the converter transformer protection trip is 0 or not is judged, and if the three-trip-in state of the converter transformer protection trip is 0, whether the pole control system receives the ESOF signal or not is judged.
That is to say, two logic judgment conditions are added on the basis of the existing closing logic: the method comprises the steps of judging whether the three-trip-in state of the converter transformer protection trip is 1 or not and judging whether the pole control system receives an ESOF signal or not.
And the closing incoming line switch command is sent to the middle switch, and when the three-trip-in state of the converter transformer protection trip is 0 and the pole control system does not receive the ESOP signal, the closing allowable state of the middle switch is 1 after the preset time is delayed. The preset time is determined according to the running condition of the system.
If the switch-on permission state of the middle switch is 1, judging whether the checking period of the interface device is qualified;
if the detection period of the interface device is qualified, whether the phase selection of the phase selection switching-on device is successful is judged, if the phase selection of the phase selection switching-on device is successful, the switching-on and switching-off of the switch are allowed, and the switch-on operation of the switch is completed.
Detailed description of the preferred embodiment
On the basis of the second specific embodiment, the determining whether the closing permission state of the middle switch is 1 further includes determining whether the closing state of the side switch is 1.
The switching-on process of the side switch comprises the following steps:
the closing incoming line switch command is sent to the side switch, whether the closing permission state of the side switch is 1 or not is judged, and whether the closing permission state of the side switch is 1 or not is judged, wherein judging whether the side switch is in a fault-free state and whether the opening state is 1 or not is included;
if the side switch is in a fault-free state and the switching-off state is 1, namely the switching-on allowable state of the side switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection switching-on device is successful or not;
and if the phase selection of the phase selection closing device is successful, closing the side switch, wherein the closing state of the side switch is 1.
That is, before determining the three-trip-in state of the converter transformer protection trip, it is determined whether the on-state of the side switch is 1, and if the on-state of the side switch is 1, it is determined whether the three-trip-in state of the converter transformer protection trip is 0.
Therefore, three logic judgment conditions are added on the basis of the existing closing logic: the method comprises the steps of judging whether the closing state of a side switch is 1 or not, judging whether the tripping of the converter transformer protection is three-hop or not, judging whether the opening state is 0 or not, and judging whether an ESOF signal is received by a pole control system or not.
Detailed description of the invention
On the basis of the third embodiment, determining whether the on/off allowed state of the middle switch is 1 further includes determining whether the middle switch is in a no-fault state and the off state is 1:
before judging whether the closing state of the side switch is 1, judging whether the middle switch is in a fault-free state and whether the opening state is 1;
and when the middle switch is in a fault-free state and the opening state is 1, judging whether the closing state of the side switch is 1 or not.
In summary, the determination of whether the switch-on allowable state is 1 includes: judging whether the middle switch is in a fault-free and trip-free state and is 1, judging whether the side switch is in a closing state and is 1, judging whether the converter transformer protection trip three-trip-in state is 0 and judging whether the pole control system receives an ESOF signal.
The method specifically comprises the following steps:
the method comprises the steps that a closing line switch command is sent to a side switch firstly, the closing permission state of the side switch is judged to be 1, and whether the closing permission state of the side switch is 1 or not is judged to include that whether the side switch is in a fault-free state and whether the opening state is 1 or not;
if the side switch is in a fault-free state and the opening state is 1, the closing permission state of the side switch is 1, and whether the checking synchronization period of the interface device is qualified is judged;
if the checking period of the interface device is qualified, whether the phase selection of the phase selection closing device is successful is judged, and if the phase selection of the phase selection closing device is successful, the switch is closed while the switch is in a closing state of 1.
And sending the closing line switch command to the side switch firstly, and sending the closing line switch command to the middle switch after 200ms delay.
And (4) sending a closing line switch command to the middle switch, and firstly judging whether the closing permission state of the middle switch is 1. Judging whether the switch closing permission state is 1 or not comprises the following steps: and judging whether the middle switch is in a fault-free state and the opening state is 1, judging whether the closing state of the side switch is 1, judging whether the three-trip opening state of the converter transformer protection trip is 0 and judging whether the pole control system receives an ESOF signal.
The method specifically comprises the following steps: firstly, judging whether a middle switch is in a fault-free state and a switching-off state is 1, and if the middle switch is in the fault-free state and the switching-off state is 1, judging whether a switching-on state of a side switch is 1;
if the closing state of the side switch is 1, judging whether the three-trip opening state of the converter transformer protection trip is 0 or not;
if the three-trip-in state of the converter transformer protection trip is 0, judging whether the pole control system receives an ESOF signal;
if the pole control system does not receive the ESOF signal, after delaying the preset time, the open-close allowable state of the switch is 1.
When the switch-on permission state of the middle switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection closing device is successful;
and if the phase selection of the phase selection switching-on device is successful, the switching-on and switching-off of the switch are allowed, and the switch finishes the switching-on operation.
According to the method, by adding the judging condition of the switching-on logic of the middle switch, under the conditions that the switching-on state of the side switch is 1, the three-trip switching-in state of the converter transformer protection trip is 0 and the pole control system does not receive an ESOF signal, the allowable state of the switching-on and switching-off of the middle switch is 1, the pole control sequential control operation logic is greatly improved, the blocking switching-on process can be effectively interrupted after the direct current transmission pole control system fails or transformer equipment fails in the operation process, the correctness of the sequential control of the converter transformer incoming line breaker is ensured, and the stable operation of a power grid is ensured.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (6)
1. A switching-on logic optimization method for a switch in a converter transformer incoming line is characterized by comprising the following steps:
the method comprises the steps that a closing line switch command is sent to a middle switch, whether the closing permission state of the middle switch is 1 or not is judged, and whether the closing permission state of the middle switch is 1 or not is judged, wherein whether an electrode control system receives an ESOF signal or not is judged;
if the pole control system does not receive the ESOF signal and delays for a preset time, the open-close allowable state of the middle switch is 1;
when the closing permission state of the middle switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection switching-on device is successful;
and if the phase selection of the phase selection switching-on device is successful, the switching-on and switching-off of the switch are allowed, and the switch finishes the switching-on operation.
2. The method for optimizing switching-on logic of the switch in the incoming line of the converter transformer according to claim 1,
judging whether the closing permission state of the middle switch is 1 or not further comprises judging whether the three-trip switching-in state of the converter transformer protection trip is 0 or not:
before the pole control system is judged to receive the ESOF signal, whether the three-trip-in state of the converter transformer protection trip is 0 or not is judged, and if the three-trip-in state of the converter transformer protection trip is 0, whether the pole control system receives the ESOF signal or not is judged.
3. The method for optimizing switching-on logic of the switch in the converter transformer inlet wire according to claim 2,
judging whether the closing permission state of the middle switch is 1 further comprises judging whether the closing state of the side switch is 1:
before the judgment of whether the three-trip-in state of the converter transformer protection trip is 0 or not, judging whether the closing state of the side switch is 1 or not, and if the closing state of the side switch is 1, judging whether the three-trip-in state of the converter transformer protection trip is 0 or not.
4. The method for optimizing switching-on logic of the switch in the converter transformer inlet wire according to claim 3,
judging whether the switching-on allowable state of the intermediate switch is 1 or not further comprises judging whether the intermediate switch is in a fault-free state and whether the switching-off state is 1 or not:
before judging whether the closing state of the side switch is 1, judging whether the middle switch is in a fault-free state and whether the opening state is 1;
and when the middle switch is in a fault-free state and the opening state is 1, judging whether the closing state of the side switch is 1 or not.
5. The method for optimizing switching-on logic of the switch in the converter transformer inlet wire according to claim 3,
the switching-on process of the side switch comprises the following steps: the closing incoming line switch command is sent to the side switch, whether the closing permission state of the side switch is 1 or not is judged, and whether the closing permission state of the side switch is 1 or not is judged, wherein judging whether the side switch is in a fault-free state and whether the opening state is 1 or not is included;
if the side switch is in a fault-free state and the switching-off state is 1, namely the switching-on allowable state of the side switch is 1, judging whether the checking period of the interface device is qualified or not;
if the checking period of the interface device is qualified, judging whether the phase selection of the phase selection switching-on device is successful or not;
and if the phase selection of the phase selection closing device is successful, closing the side switch, wherein the closing state of the side switch is 1.
6. The method for optimizing switching-on logic of the converter transformer incoming line switch according to claim 5, wherein the incoming line switch command is sent to the edge switch first, and after 200ms delay, the incoming line switch command is sent to the middle switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011292507.0A CN112366825A (en) | 2020-11-18 | 2020-11-18 | Switching-on logic optimization method for switch in incoming line of converter transformer |
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| CN202011292507.0A CN112366825A (en) | 2020-11-18 | 2020-11-18 | Switching-on logic optimization method for switch in incoming line of converter transformer |
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| CN114019872A (en) * | 2021-11-05 | 2022-02-08 | 中冶赛迪电气技术有限公司 | Circuit breaker opening and closing time sequence and fault judgment logic control system thereof |
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