Voltage protection method and control device

Abstract

The application discloses a voltage protection method and a control device, and relates to the field of generators, and aims to solve the problem that the safe and stable operation of a power system is affected due to the misoperation of voltage protection in the prior art. The protection method comprises the following steps: acquiring a terminal voltage of a generator and an operating state of the generator; the terminal voltage is a voltage output by the generator to a main transformer; in the case that the terminal voltage is determined to be less than a preset value and the generator is in an operating state, a voltage protection signal is triggered; and based on the voltage protection signal, a voltage protection device is controlled to perform a voltage protection action.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of generators, and in particular to a voltage protection method and a control device. BACKGROUND

[0002] In a power plant, a voltage protection device is a common protection device. By using a voltage protection device (for example, a low voltage protection device), a voltage protection action can be triggered when the voltage of a generator is lower than a certain value, so as to avoid faults such as overcurrent and overtemperature of the generator winding and insulation damage of the generator caused by low voltage operation of the generator, thereby protecting the safety of a power system (which can include a power grid, a generator, and auxiliary equipment of the generator).

[0003] In the related art, a generator terminal voltage is generally collected. When the generator terminal voltage is lower than a set value, a voltage protection device triggers a voltage protection action, thereby protecting the safety of a power grid, a generator, and auxiliary equipment of the generator.

[0004] However, in the related art, there is a problem that the safe and stable operation of a power system is affected due to a voltage protection misoperation. For example, in a working condition in which a generator is shut down for maintenance according to a plan, a generator unit is decoupled from other parts (for example, a power grid) of a power system, the generator terminal voltage is zero, a main transformer outlet isolating switch is turned off, and a booster station circuit breaker is operated in a loop. At this time, the voltage protection device can detect that the generator terminal voltage is lower than the set value in the case where the generator terminal voltage is zero, and incorrectly triggers a voltage protection action, so that the booster station circuit breaker is turned off, thereby affecting the safe and stable operation of the power grid and further affecting the safe and stable operation of the power system. SUMMARY

[0005] Embodiments of the present application provide a voltage protection method and a control device, which solve the problem that the safe and stable operation of a power system is affected due to a voltage protection misoperation in the related art.

[0006] To solve the above technical problem, the present application is implemented as follows:

[0007] In a first aspect, embodiments of the present application provide a voltage protection method, which includes:

[0008] obtaining a terminal voltage of a generator and an operating state of the generator; the terminal voltage is a voltage output by the generator to a main transformer;

[0009] in a case where it is determined that the terminal voltage is less than a preset value and the generator is in an operating state, triggering a voltage protection signal;

[0010] controlling a voltage protection device to perform a voltage protection action based on the voltage protection signal.

[0011] Optionally, in the embodiments of the present application, the protection method further includes:

[0012] acquire a working state of an isolating switch; the isolating switch is a switch at an outlet of the main transformer;

[0013] determine that the generator is in a running state in a case where the isolating switch is in a closed position.

[0014] Optionally, in the embodiment of the present application, the triggering of the voltage protection signal in a case where the terminal voltage of the generator is less than a preset value and the generator is in the running state comprises:

[0015] the triggering of the voltage protection signal in a case where the terminal voltage of the generator is less than a preset value and the isolating switch is in the closed position.

[0016] Optionally, in the embodiment of the present application, the terminal voltage of the generator comprises a first line voltage, a second line voltage and a third line voltage;

[0017] the terminal voltage of the generator being less than a preset value comprises that the first line voltage is less than a preset value, or the second line voltage is less than a preset value, or the third line voltage is less than a preset value;

[0018] the triggering of the voltage protection signal in a case where the terminal voltage of the generator is less than a preset value and the isolating switch is in the closed position comprises:

[0019] the triggering of the voltage protection signal in a case where the first line voltage is less than a preset value and the isolating switch is in the closed position;

[0020] or, the triggering of the voltage protection signal in a case where the second line voltage is less than a preset value and the isolating switch is in the closed position;

[0021] or, the triggering of the voltage protection signal in a case where the third line voltage is less than a preset value and the isolating switch is in the closed position.

[0022] Optionally, in the embodiment of the present application, the control of the voltage protection device to perform a voltage protection action based on the voltage protection signal comprises:

[0023] the control of the voltage protection device to perform a voltage protection action based on the voltage protection signal in a case where the voltage protection signal is continuously triggered within a preset time period.

[0024] In a second aspect, an embodiment of the present application provides a control device, comprising:

[0025] an acquisition module, configured to acquire a terminal voltage of a generator and a working state of the generator; the terminal voltage is a voltage output by the generator to a main transformer;

[0026] trigger a voltage protection signal in a case that it is determined that the machine terminal voltage is less than a preset value and the generator is in a running state;

[0027] control a voltage protection device to perform a voltage protection action based on the voltage protection signal.

[0028] Optionally, in the embodiment of the present application, the acquisition module is further configured to acquire a working state of an isolating switch; the isolating switch is a switch at an outlet of the main transformer;

[0029] The control device further includes a determination module configured to determine that the generator is in a running state in a case that the isolating switch is in a closed position.

[0030] Optionally, in the embodiment of the present application, the trigger module is configured to trigger a voltage protection signal in a case that it is determined that the machine terminal voltage is less than a preset value and the isolating switch is in a closed position.

[0031] Optionally, in the embodiment of the present application, the machine terminal voltage includes a first line voltage, a second line voltage and a third line voltage; the machine terminal voltage being less than a preset value includes that the first line voltage is less than a preset value, or the second line voltage is less than a preset value, or the third line voltage is less than a preset value.

[0032] The trigger module is specifically configured to:

[0033] trigger a voltage protection signal in a case that it is determined that the first line voltage is less than a preset value and the isolating switch is in a closed position;

[0034] or trigger a voltage protection signal in a case that it is determined that the second line voltage is less than a preset value and the isolating switch is in a closed position;

[0035] or trigger a voltage protection signal in a case that it is determined that the third line voltage is less than a preset value and the isolating switch is in a closed position.

[0036] Optionally, in the embodiment of the present application, the control module is specifically configured to control a voltage protection device to perform a voltage protection action based on the voltage protection signal in a case that the voltage protection signal is triggered for a preset time period.

[0037] In the embodiment of the present application, the machine terminal voltage of the generator and the working state of the generator are acquired; the machine terminal voltage is the voltage output by the generator to the main transformer; in the case that the machine terminal voltage is less than a preset value and the generator is in a running state, a voltage protection signal is triggered; based on the voltage protection signal, the voltage protection device is controlled to perform a voltage protection action. In this way, in the case that the machine terminal voltage is less than a preset value and the generator is in a running state, a voltage protection signal is triggered; and in the case that the generator is in a shutdown state, even if the machine terminal voltage is less than a preset value, the voltage protection signal will not be triggered. Thus, in the case that the generator is in a shutdown state, the voltage protection device can be prevented from triggering a voltage protection action by mistake, and the problem of affecting the safe and stable operation of the power system due to the voltage protection misoperation in the related art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate certain illustrative embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0039] Figure 1 A schematic flow chart of a voltage protection method provided by an embodiment of the present application;

[0040] Figure 2 A partial schematic structural block diagram of a power system provided by an embodiment of the present application;

[0041] Figure 3 A schematic flow chart of another voltage protection method provided by an embodiment of the present application;

[0042] Figure 4 A schematic flow chart of another voltage protection method provided by an embodiment of the present application;

[0043] Figure 5 A schematic structural block diagram of a control device provided by an embodiment of the present application;

[0044] Legend of reference signs:

[0045] 201: generator; 202: main transformer; 203: disconnecting switch; 204: booster station; 205: booster station circuit breaker; 206: power grid; 207: controller; 208: voltage protection device; 209: auxiliary transformer; 210: auxiliary electrical equipment. DETAILED DESCRIPTION

[0046] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in connection with the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0047] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0048] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The technical solutions of the present application can be applied to power plants, for example, as shown in Figure 2 The power system can include a generator 201, a main transformer 202, a disconnector 203, a booster station 204, a booster station circuit breaker 205, a power grid 206, a controller 207, a voltage protection device 208, a plant transformer 209 and a plant electrical equipment 210.

[0050] In the power plant, the low voltage operation of the generator 201 can affect the stable operation of the power system. For example, the low voltage operation of the generator 201 can cause the overcurrent of the generator winding, which can cause the generator winding to overheat and even damage the insulation; for example, the stability of the parallel operation of the generator is destroyed, causing the power system to oscillate or step out of step; for example, the low voltage causes the inertial operation of the plant motor, causing the damage of the plant electrical equipment. Based on this, the voltage protection device can normally act when the generator voltage is low to a certain value, protecting the safety of the power grid, the generator and its plant electrical equipment.

[0051] In the related art, the voltage protection device outlet logic only collects the generator terminal voltage as the basis for discrimination, and there is a risk of voltage protection device misoperation. For example, after the generator is shut down, the generator set is disconnected from the power system, the generator terminal voltage is zero, the disconnector at the outlet of the main transformer is turned off, and the booster station breaker is operated in a loop. At this time, if the protection function of the voltage protection device has not been exited, the outlet mode is full stop or disconnection de-excitation, and the outlet pressure plate has not been exited, the voltage protection device will execute voltage protection misoperation, causing the booster station breaker to be disconnected, thereby affecting the safe and stable operation of the power grid, and further affecting the safe and stable operation of the power system.

[0052] Based on this, the technical scheme of the present application can consider both the generator terminal voltage and whether the generator is in a shutdown state when designing the control logic of the voltage protection action. In the case of generator shutdown, the voltage protection device will not trigger the voltage protection action, and will not cause protection misoperation, thereby improving the reliability of the voltage protection device and ensuring the safe and stable operation of the power system.

[0053] The voltage protection method provided by the embodiments of the present application will be described in detail below in combination with Figure 1 , Figure 3 and Figure 4 .

[0054] Figure 1 A schematic flowchart of the voltage protection method provided by the embodiments of the present application.

[0055] As shown in Figure 1 , the voltage protection method provided by the embodiments of the present application can include:

[0056] Step 110: acquiring a terminal voltage of a generator and an operating state of the generator; the terminal voltage being a voltage output by the generator to a main transformer;

[0057] Step 120: in a case where it is determined that the terminal voltage is less than a preset value and the generator is in an operating state, triggering a voltage protection signal;

[0058] Step 130: based on the voltage protection signal, controlling a voltage protection device to execute a voltage protection action.

[0059] In step 110, the terminal voltage of the generator can refer to Figure 2 , which is the voltage output by the generator 201 to the main transformer 202. The terminal voltage can include a three-phase alternating voltage. The operating state of the generator can include the generator being in an operating state or the generator being in a shutdown state.

[0060] In the embodiments of the present application, the terminal voltage of the generator can be acquired by a sensor such as an electric quantity transmitter.

[0061] In the embodiments of the present application, the working state of the generator can be acquired in different ways. For example, whether the generator is in a shutdown state can be determined by judging whether the terminal voltage of the generator is zero. For another example, whether the generator is in a shutdown state can also be determined by the position of the breaker of the disconnector 203. Of course, there are other determination manners, which are not limited in the present application.

[0062] In the embodiments of the present application, the acquired terminal voltage of the generator and the working state of the generator can be transmitted to the controller 207. Specifically, whether the terminal voltage is less than a preset value and whether the generator is in a running state can be determined according to the acquired terminal voltage of the generator and the working state of the generator. In the case that the terminal voltage is less than the preset value and the generator is in a running state, a voltage protection signal is triggered, and the voltage protection device 208 performs a voltage protection action based on the voltage protection signal, so as to make the booster station breaker open.

[0063] The controller 207 can be a local controller or a personal workstation in a remote control system, which is not limited in the present application.

[0064] In step 120, the condition for triggering the voltage protection signal is not only that the terminal voltage is less than the preset value but also that the generator is in a running state. That is to say, in the case that the generator is in a shutdown state, even if the terminal voltage is less than the preset value, the voltage protection signal will not be triggered. In this way, in the case that the terminal voltage of the generator is zero (the generator is in a shutdown state), the voltage protection device can be prevented from triggering the voltage protection action by mistake, so as to solve the problem that the safe and stable operation of the power system is affected due to the voltage protection misoperation in the related art.

[0065] In step 130, the voltage protection device is controlled to perform the voltage protection action based on the voltage protection signal. The voltage protection device performs the voltage protection action, so as to make the booster station breaker open, thereby protecting the safety of the power grid, the generator and the auxiliary equipment thereof. Of course, the voltage protection action can also be applied to other devices or switches, which are not limited in the present application.

[0066] The voltage protection method provided in the embodiments of the present application comprises the following steps: obtaining a terminal voltage of a generator and an operating state of the generator; the terminal voltage is a voltage output by the generator to a main transformer; triggering a voltage protection signal in a case where the terminal voltage is less than a preset value and the generator is in an operating state; and controlling a voltage protection device to perform a voltage protection action based on the voltage protection signal. In this way, the voltage protection signal is triggered in a case where the terminal voltage is less than the preset value and the generator is in the operating state, and the voltage protection signal is not triggered in a case where the generator is in a shutdown state even if the terminal voltage is less than the preset value. Thus, in the case where the generator is in the shutdown state, the voltage protection device can be prevented from triggering the voltage protection action by mistake, and the problem of affecting the safe and stable operation of a power system due to the voltage protection action by mistake in the prior art is solved.

[0067] In one specific embodiment, as shown in Figure 2 , if the disconnecting switch 203 is in the closed position, it can be determined that the generator 201 is in the operating state. That is, the operating state of the generator can be determined by the operating state of the disconnecting switch. The following is an example. Figure 3

[0068] As shown in Figure 3 , the voltage protection method provided in the embodiments of the present application can comprise the following steps:

[0069] Step 310: obtaining an operating state of a disconnecting switch; the disconnecting switch is a switch at an outlet of the main transformer;

[0070] Step 320: determining that the generator is in an operating state in a case where the disconnecting switch is in a closed position;

[0071] Step 330: triggering a voltage protection signal in a case where the terminal voltage is less than a preset value and the disconnecting switch is in the closed position.

[0072] In step 310, the operating state of the disconnecting switch can be obtained by whether the circuit where the disconnecting switch is located is cut off. If the circuit where the disconnecting switch is located is in a power-on state, it indicates that the disconnecting switch is in the closed position; if the circuit where the disconnecting switch is located is in a power-off state, it indicates that the disconnecting switch is in an open position.

[0073] In step 320, in a case where the disconnecting switch is in the closed position, it can be determined that the generator is in the operating state. In a case where the disconnecting switch is in the open position, it can be determined that the generator is in a shutdown state.

[0074] ​Step 330 can be a sub-step of step 120. In step 330, in a case that the machine terminal voltage is determined to be less than the preset value and the disconnecting switch is determined to be in the closed position, it can be determined that the machine terminal voltage is less than the preset value and the generator is in the running state, thereby accurately triggering the voltage protection signal.

[0075] In this way, the working state of the generator is determined by the disconnecting switch being in the closed position, without the need for calculation processing, and the working state of the generator can be quickly determined.

[0076] In a specific embodiment, the machine terminal voltage can be a three-phase alternating voltage, and the machine terminal voltage can include three line voltages: a first line voltage, a second line voltage, and a third line voltage. Accordingly, the machine terminal voltage being less than the preset value includes: the first line voltage being less than the preset value, or the second line voltage being less than the preset value, or the third line voltage being less than the preset value. The following is exemplified by taking the first line voltage as an example. Figure 4

[0077] As shown in Figure 4 , the voltage protection method provided by the embodiment of the present application can include:

[0078] Step 410: in a case that the first line voltage is determined to be less than the preset value and the disconnecting switch is determined to be in the closed position, triggering the voltage protection signal; or, in a case that the second line voltage is determined to be less than the preset value and the disconnecting switch is determined to be in the closed position, triggering the voltage protection signal; or, in a case that the third line voltage is determined to be less than the preset value and the disconnecting switch is determined to be in the closed position, triggering the voltage protection signal.

[0079] Step 420: in a case that the voltage protection signal is continuously triggered within a preset time period, controlling the voltage protection device to perform a voltage protection action based on the voltage protection signal.

[0080] Step 410 can be a sub-step of step 330, and step 420 can be a sub-step of step 130.

[0081] In step 410, if any one of the first line voltage, the second line voltage, and the third line voltage is less than the preset value, it can be determined that the machine terminal voltage of the generator is less than the preset value. In this way, the voltage values of different line voltages can all represent the machine terminal voltage of the generator. In a case that one of the line voltages is less than the preset value, even if the other two line voltages are greater than the preset value, it can still be determined that the machine terminal voltage of the generator is less than the preset value, thereby improving the reliability of determining the machine terminal voltage of the generator.

[0082] ​In step 420, the voltage protection device starts to perform the voltage protection action in the case that the voltage protection signal is continuously triggered in a preset time period, that is, the voltage protection action is performed after the voltage protection signal is triggered for a delay. In this way, the voltage protection action can be prevented from being wrongly performed due to electromagnetic interference signals, signal contact failure and the like, and the reliability of the voltage protection action is improved.

[0083] Based on the same concept as the above method embodiments, the embodiments of the present application also provide a control device.

[0084] It should be noted that the control device provided by the embodiments of the present application can perform the above voltage protection method. In the embodiments of the present application, the control device performs the voltage protection method is taken as an example to illustrate the control device provided by the embodiments of the present application.

[0085] Figure 5 is a schematic flow chart of a control device provided by the embodiments of the present application.

[0086] As shown in Figure 5 , the embodiments of the present application provide a control device, which can include:

[0087] The acquisition module 501 is configured to acquire a machine terminal voltage of a generator and an operating state of the generator; the machine terminal voltage is a voltage output by the generator to a main transformer;

[0088] The triggering module 502 is configured to trigger a voltage protection signal in the case that the machine terminal voltage is determined to be less than a preset value and the generator is in a running state.

[0089] The control module 503 is configured to control a voltage protection device to perform a voltage protection action based on the voltage protection signal.

[0090] The control device provided by the embodiments of the present application includes: an acquisition module configured to acquire a machine terminal voltage of a generator and an operating state of the generator; the machine terminal voltage is a voltage output by the generator to a main transformer; a triggering module configured to trigger a voltage protection signal in the case that the machine terminal voltage is determined to be less than a preset value and the generator is in a running state; and a control module configured to control a voltage protection device to perform a voltage protection action based on the voltage protection signal. In this way, the voltage protection signal is triggered in the case that the machine terminal voltage is determined to be less than a preset value and the generator is in a running state, and the voltage protection signal will not be triggered even if the machine terminal voltage is less than the preset value in the case that the generator is in a shutdown state. Thus, in the case that the generator is in a shutdown state, the voltage protection device can be prevented from wrongly triggering the voltage protection action, and the problem that the safe and stable operation of a power system is affected due to the voltage protection action in the related art is solved.

[0091] Optionally, in the control device provided by the embodiment of the present application, the obtaining module is further configured to obtain a working state of the disconnecting switch; the disconnecting switch is a switch at an outlet of the main transformer.

[0092] The control device further comprises a determining module configured to determine that the generator is in the running state when the disconnecting switch is in the closed position.

[0093] In this way, the working state of the generator is determined by the disconnecting switch being in the closed position, without the need for calculation processing, and the working state of the generator can be quickly determined.

[0094] Optionally, in the control device provided by the embodiment of the present application, the triggering module is configured to trigger a voltage protection signal when it is determined that the terminal voltage of the generator is less than a preset value and the disconnecting switch is in the closed position.

[0095] In this way, the voltage protection signal is triggered when it is determined that the terminal voltage of the generator is less than a preset value and the disconnecting switch is in the closed position, which can reduce the possibility of voltage protection misoperation after the generator is shut down, and ensures the safe and stable operation of the power system.

[0096] Optionally, in the control device provided by the embodiment of the present application, the terminal voltage of the generator comprises a first line voltage, a second line voltage and a third line voltage; the terminal voltage of the generator being less than a preset value comprises: the first line voltage being less than a preset value, or the second line voltage being less than a preset value, or the third line voltage being less than a preset value.

[0097] The triggering module is specifically configured to:

[0098] trigger the voltage protection signal when it is determined that the first line voltage is less than a preset value and the disconnecting switch is in the closed position;

[0099] or trigger the voltage protection signal when it is determined that the second line voltage is less than a preset value and the disconnecting switch is in the closed position;

[0100] or trigger the voltage protection signal when it is determined that the third line voltage is less than a preset value and the disconnecting switch is in the closed position.

[0101] In this way, the voltage values of different line voltages can represent the terminal voltage of the generator. In the case where one of the line voltages is less than a preset value, even if the other two line voltages are greater than the preset value, it can still be determined that the terminal voltage of the generator is less than a preset value, which improves the reliability of determining the terminal voltage of the generator.

[0102] Optionally, in the control device provided by the embodiment of the present application, the control module is specifically configured to: in a case that the voltage protection signal is continuously triggered within a preset time period, control the voltage protection device to perform a voltage protection action based on the voltage protection signal.

[0103] In this way, the reliability of the voltage protection action can be improved, and the voltage protection action can be prevented from being executed erroneously due to a poor signal contact or the like.

[0104] It should be further understood that the terms "comprise", "comprising", or any other variant thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements are not limited to those elements, but can also include other elements not expressly listed, or can also include elements inherent in such processes, methods, articles, or apparatuses. Without further limitation, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0105] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A method of voltage protection, characterized by, The protection method comprises: acquiring a machine terminal voltage of a generator and an operating state of the generator; the machine terminal voltage is a voltage output by the generator to a main transformer; in a case where it is determined that the machine terminal voltage is less than a preset value and the generator is in an operating state, triggering a voltage protection signal; based on the voltage protection signal, controlling a voltage protection device to perform a voltage protection action; The protection method further comprises: acquiring an operating state of a disconnecting switch; the disconnecting switch is a switch at an outlet of the main transformer; in a case where the disconnecting switch is in a closed position, determining that the generator is in an operating state; The case where it is determined that the machine terminal voltage is less than a preset value and the generator is in an operating state includes: in a case where it is determined that the machine terminal voltage is less than a preset value and the disconnecting switch is in a closed position, triggering a voltage protection signal.

2. The protection method according to claim 1, characterized in that, The machine terminal voltage comprises a first line voltage, a second line voltage and a third line voltage; The machine terminal voltage being less than a preset value includes: the first line voltage being less than a preset value, or the second line voltage being less than a preset value, or the third line voltage being less than a preset value; The case where it is determined that the machine terminal voltage is less than a preset value and the disconnecting switch is in a closed position includes: in a case where it is determined that the first line voltage is less than a preset value and the disconnecting switch is in a closed position, triggering a voltage protection signal; or, in a case where it is determined that the second line voltage is less than a preset value and the disconnecting switch is in a closed position, triggering a voltage protection signal; or, in a case where it is determined that the third line voltage is less than a preset value and the disconnecting switch is in a closed position, triggering a voltage protection signal.

3. The protection method of claim 1, wherein, Based on the voltage protection signal, controlling a voltage protection device to perform a voltage protection action includes: in a case where the voltage protection signal is continuously triggered within a preset time period, based on the voltage protection signal, controlling a voltage protection device to perform a voltage protection action.

4. A control device characterized by comprising: The control device comprises: an acquisition module, configured to acquire a machine terminal voltage of a generator and an operating state of the generator; the machine terminal voltage is a voltage output by the generator to a main transformer; a triggering module, configured to, in a case where it is determined that the machine terminal voltage is less than a preset value and the generator is in an operating state, trigger a voltage protection signal; a control module, configured to, based on the voltage protection signal, control a voltage protection device to perform a voltage protection action; The acquisition module is further configured to acquire an operating state of a disconnecting switch; the disconnecting switch is a switch at an outlet of the main transformer; The control device further comprises a determination module, configured to, in a case where the disconnecting switch is in a closed position, determine that the generator is in an operating state; The triggering module is configured to, in a case where it is determined that the machine terminal voltage is less than a preset value and the disconnecting switch is in a closed position, trigger a voltage protection signal.

5. The control device of claim 4, wherein The machine terminal voltage comprises a first line voltage, a second line voltage and a third line voltage; the machine terminal voltage being less than a preset value includes: the first line voltage being less than a preset value, or the second line voltage being less than a preset value, or the third line voltage being less than a preset value; The triggering module is specifically configured to: trigger a voltage protection signal in a case where it is determined that the first line voltage is less than a preset value and the disconnector is in a closed position; or trigger the voltage protection signal in a case where it is determined that the second line voltage is less than the preset value and the disconnector is in the closed position; or trigger the voltage protection signal in a case where it is determined that the third line voltage is less than the preset value and the disconnector is in the closed position.

6. The control device of claim 4, wherein The control module is specifically configured to: control a voltage protection device to perform a voltage protection action based on the voltage protection signal in a case where the voltage protection signal is continuously triggered within a preset time period.

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