ETS electromagnetic valve power supply control circuit and turbine ETS system
By using distributed redundant power supply and electronic control circuits in the turbine ETS system, combined with high and low voltage crossing protection devices, the problem that the power switching device cannot respond to changes in power quality in a timely manner, and the reliability and safety of the system are improved.
Patent Information
- Application Number
- CN202510197503.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-07-04
AI Technical Summary
In the existing steam turbine trip protection system, the power switching device and the redundant power supply circuit cannot be switched in time when the power quality changes, resulting in the solenoid valve being erroneously activated and affecting the system reliability and safety.
The redundant power supply and electronic control circuit design are adopted to monitor voltage stability through high and low voltage crossing protection devices, and the power supply is cut off when a fault is detected to ensure independent power supply and electrical isolation of the electronic control component group.
It improves the reliability of the ETS system, prevents protection errors caused by power circuit failure, reduces the impact range of equipment failure, and avoids equipment accidents caused by power loss, power outage or poor power quality.
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Figure CN120262667A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of ETS solenoid valve control, and particularly to an ETS solenoid valve power supply control circuit and a steam turbine ETS system. Background Art
[0002] In the industrial field, ETS is the abbreviation of the steam turbine trip protection system, and its full name is Emergency trip system. When the steam turbine operates abnormally and the steam turbine generator control system cannot control the steam turbine system within the normal range, to prevent damage to the steam turbine generator system, ETS trips the steam turbine and closes all the steam turbine inlet valves.
[0003] In the existing steam turbine trip protection system, a redundant power supply design scheme is usually adopted, that is, it consists of two exactly the same power supplies. When one power supply fails, the other power supply can immediately take over its work. After replacing the power supply, the power supply can still supply power to the electrical equipment to keep the electrical equipment working continuously. In the prior art, a power supply switching device is used to achieve automatic switching between power supplies to ensure continuous power supply to the equipment in the circuit.
[0004] Currently, mainly two-way incoming power supplies supply power to the electronic control system belonging to ETS through a power supply switching device or a redundant power supply device. The current design may have the following defects:
[0005] (1) When a fault occurs in the upper-level power supply of the power supply quality or the electronic components in the cabinet body, that is, when the frequency change and voltage change occur, the fault detection circuit generally needs the power supply to completely disappear before switching. Therefore, the power supply switching device, redundant power supply circuit, etc. will not switch to the normal power supply, which may cause faults and malfunctions of other electronic components such as the lower-level relay, resulting in the solenoid valve action and the unit tripping;
[0006] (2) ETS is the main protection equipment of the steam turbine and has high requirements for system reliability. When the power supplies are all taken from the upper-level redundant power supply or the power supply switching circuit, there are single-point devices in the overall control circuit. When the device fails, it will directly affect the power supply of the lower-level devices, resulting in protection malfunctions;
[0007] (3) When a local solenoid valve fails due to faults such as the power cord and the solenoid valve body coil, it may cause the upper-level electronic control circuit to trip. Due to the upper-level electronic control circuit tripping, it will cause abnormal power supply to the remaining solenoid valves, resulting in the overall solenoid valve losing power and the steam turbine tripping. Summary of the Invention
[0008] The embodiments of this application provide an ETS solenoid valve power supply control circuit and a steam turbine ETS system to at least solve the problem of solenoid valve malfunction in the related art.
[0009] In a first aspect, an ETS solenoid valve power supply control circuit provided by an embodiment of the present application is applied to a steam turbine ETS system. The steam turbine ETS system includes a first group of electrically controlled components and a second group of electrically controlled components. The control circuit includes a redundant power supply composed of a first power supply and a second power supply, a first voltage ride-through protection module, a second voltage ride-through protection module, a first electrically controlled circuit, and a second electrically controlled circuit. Among them,
[0010] The first voltage ride-through protection module and the first electrically controlled circuit are connected in series between the first power supply and the first group of electrically controlled components, and the first power supply supplies power to the first group of electrically controlled components.
[0011] The second voltage ride-through protection module and the second electrically controlled circuit are connected in series between the second power supply and the second group of electrically controlled components, and the second power supply supplies power to the second group of electrically controlled components.
[0012] In an embodiment, the first electrically controlled circuit and the second electrically controlled circuit include an AST electrically controlled circuit, a test electrically controlled circuit, and a PLC electrically controlled circuit. Among them,
[0013] The AST electrically controlled circuit is electrically connected to the AST solenoid valve in the group of electrically controlled components and is used to control the on / off of the AST solenoid valve.
[0014] The test electrically controlled circuit is electrically connected to the test solenoid valve in the capacitor element group and is used to control the on / off of the test solenoid valve.
[0015] The PLC electrically controlled circuit is electrically connected to the PLC in the group of electrically controlled components and is used to control the operation of the PLC.
[0016] In an embodiment, the AST electrically controlled circuit includes a first transformer, a first isolation transformer, a first circuit breaker, and a first leakage protector connected in series in sequence. Among them,
[0017] The first transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the first isolation transformer is used to electrically isolate the redundant power supply and the first group of electrically controlled components; the first leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
[0018] In an embodiment, the test electrically controlled circuit includes a second transformer, a second isolation transformer, a second circuit breaker, and a second leakage protector connected in series in sequence. Among them,
[0019] The second transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the second isolation transformer is used to electrically isolate the redundant power supply and the second electronic control component group; the second leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
[0020] In one embodiment, the PLC electronic control circuit includes a third isolation transformer and a third circuit breaker connected in series.
[0021] In one embodiment, the first voltage ride-through protection module or the second voltage ride-through protection module includes a high voltage ride-through protection device and a low voltage ride-through protection device; wherein,
[0022] The high voltage ride-through protection device is used to monitor the voltage in the control circuit in real time, and when the voltage is greater than the set high voltage threshold, take corresponding measures to maintain a stable voltage;
[0023] The low voltage ride-through protection device is used to monitor the voltage in the control circuit in real time, and when the voltage is less than the set low voltage threshold, take corresponding measures to maintain a stable voltage.
[0024] In a second aspect, an embodiment of the present application provides a steam turbine ETS system, including a first electronic control component group, a second electronic control component group, and the ETS solenoid valve power supply control circuit according to any one of the above embodiments; wherein, the first electronic control component group and the second electronic control component group are respectively powered by a first power supply and a second power supply in the control circuit.
[0025] In one embodiment, the first electronic control component group includes a first AST solenoid valve group, a first test solenoid valve, and a first PLC; the second electronic control component group includes a second AST solenoid valve group, a second test solenoid valve, and a second PLC;
[0026] Wherein, the first AST solenoid valve group and the second AST solenoid valve group are connected in series, the first test solenoid valve and the second test solenoid valve are arranged at the same position in the ETS; the functions of the first PLC and the second PLC are the same.
[0027] In one embodiment, the first AST solenoid valve group and the second AST solenoid valve group are respectively composed of two AST solenoid valves connected in parallel.
[0028] In one embodiment, the first test solenoid valve or the second test solenoid valve includes a lubricating oil test solenoid valve, an EH oil test solenoid valve, and a vacuum test solenoid valve.
[0029] The ETS solenoid valve power supply control circuit and the steam turbine ETS system provided by the embodiments of the present application at least have the following technical effects:
[0030] Power is supplied by decentralized power sources to improve the reliability of the ETS system operation and prevent misoperation of protection caused by power circuit failures. Additionally, by dispersing the electrical control circuits of each system, the scope of equipment affected after a device failure is reduced. A malfunction of a single device will not cause overall protection actions. Through the power layout design, equipment accidents caused by power loss, power outage, and poor power quality are avoided.
[0031] Details of one or more embodiments of this application are presented in the following drawings and description to make other features, objectives, and advantages of this application more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The drawings described herein are used to provide a further understanding of this application and form a part of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:
[0033] Figure 1 is a schematic diagram of the position of the AST solenoid valve in the steam turbine ETS system in one embodiment of this application;
[0034] Figure 2 is a block diagram of the structure of the power supply control circuit of the ETS solenoid valve in one embodiment of this application;
[0035] Figure 3 is a block diagram of the structure of the electrical control circuit in one embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0036] In order to make the objectives, technical solutions, and advantages of this application clearer, the following describes and explains this application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.
[0037] Obviously, the drawings in the following description are only some examples or embodiments of this application. For those of ordinary skill in the art, this application can also be applied to other similar scenarios based on these drawings without creative efforts. Additionally, it can also be understood that although the efforts made in such a development process may be complex and time-consuming, for those of ordinary skill in the art related to the content disclosed in this application, some design, manufacturing, or production changes based on the technical content disclosed in this application are only conventional technical means and should not be understood as the content disclosed in this application being insufficient.
[0038] References to "embodiments" in this application mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.
[0039] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the ordinary meanings understood by those of ordinary skill in the technical field to which this application belongs. The words such as "a", "an", "one kind", "the" and the like involved in this application do not indicate a limitation in quantity and can represent a singular or plural number. The terms "include", "comprise", "have" and any variations thereof involved in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may further include steps or units not listed, or may further include other steps or units inherent to these processes, methods, products or devices. The words such as "connect", "be connected", "couple" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.
[0040] In an embodiment of this application, a steam turbine ETS system is provided, which includes a first group of electric control elements, a second group of electric control elements, and an ETS solenoid valve power supply control circuit. Among them, the ETS solenoid valve power supply control circuit provided in this application includes a first power supply and a second power supply, and the first power supply and the second power supply adopt a redundant design. In this embodiment, the first group of electric control elements and the second group of electric control elements are respectively powered by the first power supply and the second power supply in the power supply control circuit.
[0041] In this embodiment, the first group of electric control components includes a first group of AST solenoid valves, a first test solenoid valve, and a first PLC; the second group of electric control components includes a second group of AST solenoid valves, a second test solenoid valve, and a second PLC. Among them, the first group of AST solenoid valves and the second group of AST solenoid valves are connected in series, the first test solenoid valve and the second test solenoid valve are arranged at the same position in the ETS; the functions of the first PLC and the second PLC are the same. More specifically, the first group of AST solenoid valves and the second group of AST solenoid valves are each composed of two AST solenoid valves connected in parallel.
[0042] In addition, the first test solenoid valve or the second test solenoid valve in this embodiment includes a lubricating oil test solenoid valve, an EH oil test solenoid valve, and a vacuum test solenoid valve.
[0043] Specifically referring to Figure 2 , the turbine ETS system realizes the shutdown of the turbine valves by discharging the safety oil pressure through the AST solenoid valves. Generally, 4 AST solenoid valves are designed, and the oil circuit diagram is as shown in Figure 1 . Among them, the 20-1 and 20-3 AST solenoid valves are arranged in parallel, the 20-2 and 20-4 AST solenoid valves are arranged in parallel, and the two groups of solenoid valves are arranged in series. P1- is the pressure of the shutdown header; 63-1 / ASP - the ASP oil pressure is high (greater than 10.6 Mpa); 63-2 / ASP - the ASP (less than 4.8 Mpa) oil pressure is low, and P2 is the ASP oil pressure.
[0044] From Figure 1 , it can be seen that the emergency trip control block has the following characteristics: when the unit is on the verge of tripping, that is, after the AST oil pressure is established, P2≈P1 / 2, meeting the opening conditions of the main steam valve and the governing valve. When both channels act simultaneously, the AST oil pressure is discharged, closing the main steam valve and the governing valve of the unit to achieve the protection trip of the unit. When the first channel acts, that is, when one of [(20-1) / AST and (20-3) / AST] loses power, P2≈P1. When the second channel acts, that is, when one of [(20-1) / AST and (20-3) / AST] loses power, P2≈0. When only one of the channels acts, for example, if any solenoid valve malfunctions, P1 remains unchanged and the unit does not trip. At the same time, when any one solenoid valve fails to act, the unit protection can still act normally.
[0045] In addition, for the steam turbine ETS system, the normal operating voltage is 220V AC. An abnormal voltage fluctuation that may vary from 180VAC to 250VAC can cause interference to the lower-level electronic control circuit. Obviously, when the voltage drops, the contacts of devices such as relays, solenoid valves, and transformers will act due to the voltage drop. A decrease in the operating voltage of devices such as transformers will result in abnormal conversion voltage, thereby causing an abnormal decrease in the voltage received by the solenoid valve and problems such as misoperation of the device. To prevent such events from occurring, the current design needs to be optimized.
[0046] In view of the above situation, an embodiment of the present application provides an ETS solenoid valve power supply control circuit, which is applied to the above-mentioned steam turbine ETS system. The steam turbine ETS system includes a first electronic control component group and a second electronic control component group. The control circuit includes a redundant power supply composed of a first power supply and a second power supply, a first voltage ride-through protection module, a second voltage ride-through protection module, a first electronic control circuit, and a second electronic control circuit.
[0047] In this embodiment, the first voltage ride-through protection module and the first electronic control circuit are connected in series between the first power supply and the first electronic control component group, and the first power supply supplies power to the first electronic control component group; the second voltage ride-through protection module and the second electronic control circuit are connected in series between the second power supply and the second electronic control component group, and the second power supply supplies power to the second electronic control component group.
[0048] In a specific embodiment, the first electronic control circuit and the second electronic control circuit include an AST electronic control circuit, a test electronic control circuit, and a PLC electronic control circuit. Among them, the AST electronic control circuit is electrically connected to the AST solenoid valve in the electronic control component group to control the on / off of the AST solenoid valve; the test electronic control circuit is electrically connected to the test solenoid valve in the capacitor component group to control the on / off of the test solenoid valve; the PLC electronic control circuit is electrically connected to the PLC in the electronic control component group to control the operation of the PLC.
[0049] Specifically referring to Figure 2 , the first electronic control component group of this embodiment includes AST1 / 3, lubricating oil test solenoid valve 1, EH oil test solenoid valve 1, vacuum test solenoid valve 1, PLC1, and the second electronic control component group includes AST2 / 4, lubricating oil test solenoid valve 2, EH oil test solenoid valve 2, vacuum test solenoid valve 2, PLC2, and a redundant power supply composed of a first power supply (power supply one) and a second power supply (power supply two).
[0050] The first voltage ride-through protection module and the second voltage ride-through protection module are set to be connected between the power supply and the electric control circuit. Each voltage ride-through protection module includes a high-voltage ride-through protection device and a low-voltage ride-through protection device. Among them, the high-voltage ride-through protection device is used to monitor the voltage in the control circuit in real time, and when the voltage is greater than the set high-voltage threshold, corresponding measures are taken to maintain a stable voltage; the low-voltage ride-through protection device is used to monitor the voltage in the control circuit in real time, and when the voltage is less than the set low-voltage threshold, corresponding measures are taken to maintain a stable voltage.
[0051] Reference Figure 2 , the first electric control circuit includes an AST electric control circuit 1, a test electric control circuit 1, and a PLC electric control circuit 1; the second electric control circuit includes an AST electric control circuit 2, a test electric control circuit 2, and a PLC electric control circuit 2. Among them, the AST electric control circuit 1 is connected to AST1 / 3, the AST electric control circuit 2 is connected to AST2 / 4, the test electric control circuit 1 is connected to a lubricating oil test solenoid valve 1, an EH oil test solenoid valve 1, and a vacuum test solenoid valve 1, the test electric control circuit 2 is connected to a lubricating oil test solenoid valve 2, an EH oil test solenoid valve 2, and a vacuum test solenoid valve 2, and the PLC electric control circuit 1 and the PLC electric control circuit 2 are respectively connected to PLC1 and PLC2.
[0052] In a preferred embodiment, reference Figure 3 , the AST electric control circuit includes a first transformer, a first isolation transformer, a first circuit breaker, and a first leakage protector connected in series in sequence. Among them, the first transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the first isolation transformer is used to electrically isolate the redundant power supply and the first electric control component group; the first leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
[0053] The test electric control circuit includes a second transformer, a second isolation transformer, a second circuit breaker, and a second leakage protector connected in series in sequence. Among them, the second transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the second isolation transformer is used to electrically isolate the redundant power supply and the second electric control component group; the second leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
[0054] The PLC electric control circuit includes a third isolation transformer and a third circuit breaker connected in series.
[0055] In this application, power supplies 1 and 2 are separated to supply power to each solenoid valve, PLC, and electric control components. When there are faults in the circuit loop, solenoid valves, or on-site electric control equipment, only a single power supply will malfunction, and the accident will not expand, preventing misoperation of the system protection caused by a single power supply failure. In addition, high- and low-voltage ride-through protection devices are added to prevent misoperation of downstream equipment caused by abnormal power supplies. That is, when large-capacity equipment, protection switches, etc. connected to the upstream power supply trip or are grounded, if the fluctuation range is not within the control range of the power protection device and the power switching device, the power protection device and the power switching device will not perform protection processing. Therefore, by designing the high / low-voltage ride-through protection device, the power quality is ensured, and it is ensured that a stable voltage can be maintained briefly during an accident without affecting the safe operation of the system.
[0056] In summary, the power supply control circuit of this application realizes the improvement of the reliability of power supply and the quality of the electric control circuit through the decentralized redundancy design of the power supply and the electric control circuit. The power supply control circuit provided by this application has the following advantages:
[0057] First, faults such as power quality (voltage, frequency, etc.) will only affect a single solenoid valve in one circuit and will not cause both solenoid valves in two circuits to operate simultaneously, reducing the risk of equipment misoperation.
[0058] Second, faults in the electrical components of the electric control circuit will only affect a single solenoid valve in one circuit and will not cause both solenoid valves in two circuits to operate simultaneously, reducing the risk of equipment misoperation.
[0059] Third, faults in on-site solenoid valves or other electric control components (interference, abnormal current, etc.) will only cause a fault in the current power supply circuit, and the rest of the equipment will not be affected.
[0060] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.
[0061] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.
Claims
1. An ETS solenoid valve power supply control circuit, characterized in that, Applied in the ETS system of a steam turbine, the steam turbine ETS system includes a first group of electric control components and a second group of electric control components. The power supply control circuit includes a redundant power supply composed of a first power supply and a second power supply, a first voltage ride-through protection module, a second voltage ride-through protection module, a first electric control circuit, and a second electric control circuit. Among them, The first voltage ride-through protection module and the first electric control circuit are connected in series between the first power supply and the first group of electric control components, and the first power supply supplies power to the first group of electric control components. The second voltage ride-through protection module and the second electric control circuit are connected in series between the second power supply and the second group of electric control components, and the second power supply supplies power to the second group of electric control components.
2. The power supply control circuit according to claim 1, wherein The first electric control circuit and the second electric control circuit include an AST electric control circuit, a test electric control circuit, and a PLC electric control circuit. Among them, The AST electric control circuit is electrically connected to the AST solenoid valve in the group of electric control components and is used to control the on / off of the AST solenoid valve. The test electric control circuit is electrically connected to the test solenoid valve in the group of capacitor components and is used to control the on / off of the test solenoid valve. The PLC electric control circuit is electrically connected to the PLC in the group of electric control components and is used to control the operation of the PLC.
3. The power supply control circuit according to claim 2, wherein The AST electric control circuit includes a first transformer, a first isolation transformer, a first circuit breaker, and a first leakage protector connected in series in sequence. Among them, The first transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the first isolation transformer is used to electrically isolate the redundant power supply and the first group of electric control components; the first leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
4. The power supply control circuit according to claim 2, wherein The test electric control circuit includes a second transformer, a second isolation transformer, a second circuit breaker, and a second leakage protector connected in series in sequence. Among them, The second transformer is used to convert the AC voltage output by the redundant power supply into a DC voltage; the second isolation transformer is used to electrically isolate the redundant power supply and the second group of electric control components; the second leakage protector is used to detect leakage in the circuit and cut off the power supply when leakage is detected.
5. The power supply control circuit according to claim 2, wherein The PLC electric control circuit includes a third isolation transformer and a third circuit breaker connected in series.
6. The power supply control circuit according to claim 1, characterized in that The first voltage ride-through protection module or the second voltage ride-through protection module includes a high-voltage ride-through protection device and a low-voltage ride-through protection device. Among them, The high-voltage ride-through protection device is used to monitor the voltage in the control circuit in real time. When the voltage is greater than the set high-voltage threshold, corresponding measures are taken to maintain a stable voltage. The low-voltage ride-through protection device is used to monitor the voltage in the control circuit in real time. When the voltage is less than the set low-voltage threshold, corresponding measures are taken to maintain a stable voltage.
7. A steam turbine ETS system, characterized in that, Including a first group of electric control components, a second group of electric control components, and the ETS solenoid valve power supply control circuit according to any one of claims 1-5. Among them, the first group of electric control components and the second group of electric control components are respectively powered by the first power supply and the second power supply in the control circuit.
8. The system according to claim 7, wherein The first group of electric control components includes a first group of AST solenoid valves, a first test solenoid valve, and a first PLC; the second group of electric control components includes a second group of AST solenoid valves, a second test solenoid valve, and a second PLC; Among them, the first group of AST solenoid valves and the second group of AST solenoid valves are connected in series, and the first test solenoid valve and the second test solenoid valve are arranged at the same position in the ETS; the first PLC and the second PLC have the same functions.
9. The system according to claim 8, wherein The first group of AST solenoid valves and the second group of AST solenoid valves are respectively composed of two AST solenoid valves connected in parallel.
10. The system according to claim 8, wherein, The first test solenoid valve or the second test solenoid valve includes a lubricating oil test solenoid valve, an EH oil test solenoid valve, and a vacuum test solenoid valve.