Closed-loop power grid generator voltage protection device and control method thereof

Abstract

The invention discloses a closed-loop power grid generator voltage protection device and a control method thereof, and belongs to the technical field of ship ocean engineering. A controller and a plurality of rapid sensor modules are arranged in each power subarea of a closed power grid, and when a voltage feedback signal fault is detected, the rapid sensor modules send fault signals to the controller in the power subarea to which the rapid sensor modules belong and the controller in the power subarea on the adjacent side; therefore, the controller is enabled to control the distribution board module based on the fault signal in combination with a preset time delay control method, thereby achieving the voltage protection of a closed-loop power grid generator, avoiding the time-consuming multi-parameter comparison and complex voting process in a conventional method, and improving the reliability of the system. And through redundancy control of a plurality of controllers, closed-loop power grid generator voltage protection errors caused by single control errors are avoided, and efficient closed-loop power grid generator voltage protection is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ship ocean engineering, and particularly relates to a closed-loop power grid generator voltage protection device and a control method thereof. BACKGROUND

[0002] DP3 is the highest level of the dynamic positioning system of a ship, which represents that the ship can maintain its position and heading even when a serious single fault occurs. With the continuous development of ship technology, more and more DP3 ships are currently applied in various fields. In order to further save the fuel consumption of the generator, the DP3 dynamic positioning ship usually adopts a closed-loop power grid. In the closed-loop power grid, a voltage sensor is usually used to collect the voltage of the generator, and a generator voltage regulator adjusts the voltage of the generator based on the voltage feedback signal of the generator.

[0003] Under the architecture of the closed-loop power grid, if there is a hidden fault in the generator voltage regulator and the voltage feedback signal of the generator fails, the generator voltage regulator will send a strong excitation current to the generator excitation at this time, which will cause the power grid voltage to rise rapidly. And because of the hidden fault in the generator voltage regulator, the protection function of the generator voltage regulator cannot be activated, which will cause the risk of damaging the generator and the power equipment in the grid. The DP3 ship requires that such a fault be solved in a very short time after it occurs. The traditional protection method is to detect the power grid voltage, excitation current, reactive power distribution and other parameters through sensors, combine the generator excitation curve, and determine the faulty generator by comparison and voting, and then send an instruction to the controller to disconnect the generator switch. However, the sensor sampling, data comparison and voting require a long time, which will cause the fault to be unable to be solved quickly. Therefore, there is an urgent need for a closed-loop power grid generator voltage protection device and a control method thereof to solve the defects of the prior art. SUMMARY

[0004] The application aims to provide a closed-loop power grid generator voltage protection device and a control method thereof to solve the above technical problems and improve the efficiency of closed-loop power grid generator voltage protection.

[0005] In order to solve the above technical problems, the application provides a closed-loop power grid generator voltage protection device, which is suitable for a closed-loop power grid comprising a plurality of adjacent power distribution zones, each of which comprises a plurality of generator modules and distribution board modules; the generator module is electrically connected with the distribution board module in the power distribution zone to which it belongs; the distribution board module is electrically connected with the distribution board module in the power distribution zone on its two sides; and the distribution board module is electrically connected with the busbar.

[0006] The closed-loop power grid generator voltage protection device comprises a plurality of controllers and a plurality of fast sensor modules.

[0007] A controller and several fast sensor modules are arranged in each of the power partitions;

[0008] The controller is electrically connected with the controller in the power partition on each side, and the controller is electrically connected with the distribution board module;

[0009] Each of the fast sensor modules is electrically connected with each of the generator modules in the power partition to which the fast sensor module belongs, and each of the fast sensor modules is electrically connected with the controller in the power partition to which the fast sensor module belongs; each of the fast sensor modules is also electrically connected with the controller in the power partition on the adjacent side;

[0010] The fast sensor module is used for detecting a voltage feedback signal of the corresponding generator module, and when the detection result is a voltage feedback signal fault, sending a fault signal to the controller in the power partition to which the fast sensor module belongs and the controller in the power partition on the adjacent side;

[0011] The controller is used for controlling the distribution board module based on the fault signal and a preset time delay control method, so as to realize closed-loop power grid generator voltage protection.

[0012] It can be understood that, by arranging the controller and the several fast sensor modules in each of the power partitions of the closed-loop power grid, the voltage feedback signal can be quickly obtained through the connection of the fast sensor module and the generator module; through the electrical connection between the controllers, and the electrical connection between the fast sensor module, the controller in the power partition to which the fast sensor module belongs, and the controller in the power partition on the adjacent side, a redundant signal transmission path can be formed in the closed-loop power grid; then when the voltage feedback signal fault is detected, the fast sensor module sends the fault signal to the controller in the power partition to which the fast sensor module belongs and the controller in the power partition on the adjacent side, so that the controller controls the distribution board module based on the fault signal and the preset time delay control method, thereby realizing the closed-loop power grid generator voltage protection, avoiding the time-consuming multi-parameter comparison and complex voting process in the traditional method, and avoiding the closed-loop power grid generator voltage protection error caused by the error of a single controller through the redundant control of the multiple controllers, and ensuring the efficient closed-loop power grid generator voltage protection.

[0013] As a preferred solution, the fast sensor module comprises a first fast sensor and a second fast sensor;

[0014] The voltage feedback signal detection output end of the first fast sensor is electrically connected with the voltage feedback signal detection input end of the controller in the power partition to which the first fast sensor belongs;

[0015] The voltage feedback signal detection output end of the second fast sensor is electrically connected with the voltage feedback signal detection input end of the controller in the power partition adjacent to the second fast sensor;

[0016] The voltage feedback signal detection end of the first fast sensor is electrically connected with the voltage feedback signal output end of the generator module in the power partition to which the first fast sensor belongs;

[0017] The voltage feedback signal detection end of the second fast sensor is electrically connected with the voltage feedback signal output end of the generator module in the power partition to which the second fast sensor belongs;

[0018] The generator module to which the second fast sensor is electrically connected is the same as the generator module to which the first fast sensor is electrically connected.

[0019] The first fast sensor and the second fast sensor monitor the voltage feedback signal of the same generator module in parallel, which not only avoids signal delay or blockage of a single communication link, but also reflects the working condition of the generator voltage in the closed-loop power grid more intuitively through the voltage feedback signal of the generator module, so as to ensure that the controller can respond to voltage feedback signal faults in time and efficiently, and improve the efficiency of the closed-loop power grid generator voltage protection.

[0020] As a preferred solution, the generator module comprises a generator, a voltage sensor and a generator voltage regulator.

[0021] The voltage output end of the generator is electrically connected with the distribution board module.

[0022] The voltage signal collection end of the voltage sensor is electrically connected with the voltage output end of the generator.

[0023] The voltage feedback signal output end of the voltage sensor is electrically connected with the voltage feedback signal input end of the generator voltage regulator.

[0024] The voltage feedback signal output end of the voltage sensor, as the voltage feedback signal output end of the generator module, is further electrically connected with the voltage feedback signal detection end of the first fast sensor.

[0025] The voltage feedback signal output end of the voltage sensor is further electrically connected with the voltage feedback signal detection end of the second fast sensor.

[0026] The voltage regulation signal output end of the generator voltage regulator is electrically connected with the voltage regulation signal input end of the generator.

[0027] The voltage sensor is used to detect the voltage output by the generator and generate a voltage feedback signal.

[0028] The generator voltage regulator is used for receiving the voltage feedback signal sent by the voltage sensor, and generating a voltage adjustment signal based on the voltage feedback signal to adjust the voltage of the generator.

[0029] The preferred scheme can form the basic framework of the closed-loop power grid through the link of the voltage sensor, the generator and the generator voltage regulator, and then the voltage feedback signal of the first and second fast sensors can be directly detected by being directly electrically connected to the voltage feedback signal output end of the voltage sensor, so that the voltage of the generator can be quickly obtained, and the interference of the hidden fault of the generator voltage regulator on the voltage feedback signal can be avoided, the detection accuracy and efficiency of the first and second fast sensors are ensured, and the accuracy and efficiency of the closed-loop power grid generator voltage protection are improved.

[0030] As a preferred scheme, the power distribution board module comprises: a plurality of generator switches, a first busbar switch and a second busbar switch;

[0031] In each of the power distribution areas, the number of generator switches is the same as the number of generators;

[0032] The first end of each of the generator switches is electrically connected to the voltage output end of the corresponding generator one by one;

[0033] The second end of each of the generator switches is electrically connected to the second end of the first busbar switch or the first end of the second busbar switch;

[0034] The control signal input end of the first busbar switch, the control signal input end of the second busbar switch and the control signal input end of each of the generator switches are electrically connected to the control signal output end of the controller;

[0035] The second end of the first busbar switch is electrically connected to the first end of the second busbar switch;

[0036] In the first power distribution area in the closed-loop power grid, the first end of the first busbar switch is electrically connected to the busbar;

[0037] In the remaining power distribution areas in the closed-loop power grid except the first power distribution area, the first end of the first busbar switch is electrically connected to the second end of the second busbar switch in the power distribution area on the left side;

[0038] In the last power distribution area in the closed-loop power grid, the second end of the second busbar switch is electrically connected to the busbar.

[0039] The preferred scheme can quickly separate the generator with voltage feedback signal fault from the closed-loop power grid through the power distribution board module provided with a plurality of generator switches, first busbar switches and second busbar switches, the cooperation of the generator switches and the busbar switches and the control of the controller, thereby preventing the spread of voltage out of control and realizing the efficiency and accuracy of the closed-loop power grid generator voltage protection.

[0040] As a preferred scheme, the fast sensor module is used to detect the voltage feedback signal of the corresponding generator module, and when the detection result is voltage feedback signal fault, a fault signal is sent to the controller in the power partition to which the fast sensor module belongs and the controller in the adjacent power partition, comprising:

[0041] The first fast sensor and the second fast sensor are both used to detect the voltage feedback signal of the corresponding generator module when the corresponding generator module is in the grid-connected state.

[0042] When the detection result is voltage feedback signal fault, the first fast sensor is further used to send a fault signal to the controller in the power partition to which the first fast sensor belongs, and the second fast sensor is further used to send a fault signal to the controller in the adjacent power partition to which the second fast sensor belongs.

[0043] The preferred scheme can avoid invalid operation caused by false alarm of the generator module in the non-grid-connected state by detecting only when the generator module is in the grid-connected state. When the voltage feedback signal is faulty, the first fast sensor and the second fast sensor send fault signals to the controllers in the power partition and the adjacent power partition, respectively, so that the controllers can separate the generator module with voltage feedback signal fault from the closed-loop power grid based on the fault signals, thereby improving the efficiency of the closed-loop power grid generator voltage protection. The redundant fault signal communication of multiple controllers can avoid the failure of timely and efficient closed-loop power grid generator voltage protection caused by the failure of a single controller, realize multi-level redundant protection, and improve the stability and accuracy of the closed-loop power grid generator voltage protection.

[0044] As a preferred scheme, the controller is used to control the power distribution board module based on the fault signal and a preset time delay control method to realize closed-loop power grid generator voltage protection, comprising:

[0045] The controller is used to send a first switch shutdown signal when receiving the fault signal sent by the first fast sensor, and then control the power distribution board module to realize closed-loop power grid generator voltage protection.

[0046] The controller is also used to issue a second switch cut-off signal when the received fault signal sent by the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in the grid-connected state, thereby controlling the distribution board module to realize closed-loop grid generator voltage protection.

[0047] This preferred solution achieves time delay control of the controller based on fault signals sent by the first and second fast sensors by setting a preset time threshold. The fault signal from the first fast sensor enables the controller to quickly isolate the generator module with voltage feedback signal faults from the closed-loop power grid through the control of the distribution board module. The preset time threshold also allows the controller in an adjacent power zone to control the distribution board module again based on the fault signal from the second fast sensor when the controller in the power zone to which the first fast sensor belongs cannot control the distribution board module. This achieves redundant distribution board module control, ensuring that generator modules with voltage feedback signal faults are quickly isolated from the closed-loop power grid, thus improving the efficiency and stability of generator voltage protection in the closed-loop power grid.

[0048] As a preferred embodiment, the controller is configured to issue a first switch-off signal upon receiving a fault signal from the first fast sensor, thereby controlling the power distribution board module, including:

[0049] The controller is used to issue a first switch-off signal when it receives a fault signal sent by the first fast sensor, so as to cut off the generator switch corresponding to the generator module with the voltage feedback signal fault.

[0050] This preferred solution enables fast and accurate closed-loop power grid generator voltage protection by directly cutting off the generator switch corresponding to the generator module whose voltage feedback signal has failed when the controller receives a fault signal from the first fast sensor in this power zone. This avoids the excessive time required by the comparison and voting methods in the prior art, thus improving the efficiency of closed-loop power grid generator voltage protection.

[0051] As a preferred embodiment, the controller is further configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold, and the generator module corresponding to the second fast sensor is in a grid-connected state, thereby controlling the distribution board module, including:

[0052] The controller is also configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in an on-grid state, so as to disconnect the second busbar switch of the left power zone and the first busbar switch of the right power zone of the generator module with voltage feedback signal fault.

[0053] This preferred solution, through the controller of the adjacent power zone, after receiving the fault signal from the second fast sensor and after a preset time threshold, if the generator module with the faulty voltage feedback signal is still in the grid and has not been separated from the closed-loop grid, disconnects the second busbar switch of the power zone to the left of the generator module with the faulty voltage feedback signal and the first busbar switch of the power zone to the right of the generator module with the faulty voltage feedback signal, thereby separating the power zone corresponding to the generator module with the faulty voltage feedback signal from the closed-loop grid, and realizing fast closed-loop grid generator voltage protection.

[0054] As a preferred embodiment, the communication terminal of the controller is electrically connected to the communication terminals of the controllers in the two power zones on both sides.

[0055] This preferred solution achieves cross-power zone fault collaborative control by electrically connecting the communication terminal of the controller to the communication terminals of the controllers in the two power zones respectively. This avoids the delay and excessive time of closed-loop power grid generator voltage protection caused by the failure of a single controller, and improves the efficiency of closed-loop power grid generator voltage protection.

[0056] Accordingly, embodiments of the present invention provide a control method for a closed-loop power grid generator voltage protection device, applicable to a closed-loop power grid including several adjacent power zones, each power zone including: several generator modules and distribution board modules; the generator modules are electrically connected to the distribution board modules in their respective power zones; the distribution board modules are electrically connected to the distribution board modules in the power zones on both sides; the distribution board modules are electrically connected to the busbar; the control method includes:

[0057] Obtain the closed-loop power grid generator voltage protection device as described above;

[0058] Each power zone is equipped with a controller and several fast sensor modules. The controller is electrically connected to the controllers in the power zones on both sides, and the controller is also electrically connected to the distribution board module. Each fast sensor module is electrically connected to each generator module in its respective power zone, and each fast sensor module is also electrically connected to the controller in its respective power zone. Each fast sensor module is also electrically connected to the controller in the power zone on its adjacent side.

[0059] The fast sensor module is controlled to detect the voltage feedback signal of the corresponding generator module, and when the detection result is a voltage feedback signal fault, the fast sensor module is controlled to send a fault signal to the controller in the power zone and the controller in the adjacent power zone.

[0060] Based on the fault signal, the drive controller controls the distribution board module in conjunction with a preset time delay control method to achieve closed-loop power grid generator voltage protection.

[0061] It is understood that this invention, by setting up controllers and several fast sensor modules in each power section of the closed power grid, and by connecting the fast sensor modules to the generator modules, can quickly acquire voltage feedback signals. Through electrical connections between controllers, and between fast sensor modules, the controllers of their respective power sections, and the controllers of adjacent power sections, redundant signal transmission paths can be formed in the closed-loop power grid. When a voltage feedback signal fault is detected, the fast sensor module sends the fault signal to the controllers in its respective power section and the controllers in the adjacent power section. This allows the controllers to control the distribution board modules based on the fault signal, combined with a preset time delay control method, thereby realizing closed-loop power grid generator voltage protection. This avoids the time-consuming multi-parameter comparison and complex voting process in traditional methods, and the redundant control of multiple controllers avoids closed-loop power grid generator voltage protection errors caused by single control errors, ensuring efficient closed-loop power grid generator voltage protection. Attached Figure Description

[0062] Figure 1 A schematic diagram of a closed-loop power grid generator voltage protection device provided in an embodiment of the present invention;

[0063] Figure 2 This is a schematic diagram illustrating the specific connection of a closed-loop power grid generator voltage protection device in a closed-loop power grid, as provided in an embodiment of the present invention.

[0064] Figure 3 A flowchart illustrating the steps of a control method for a closed-loop power grid generator voltage protection device provided in an embodiment of the present invention. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] Example 1

[0067] Please refer to Figure 1 , Figure 1 A schematic diagram of a closed-loop power grid generator voltage protection device provided in an embodiment of the present invention is shown below. Figure 1 As shown, the adjacent power partition described in this embodiment refers to the power partition to the right of the current power partition. The power partition adjacent to the last power partition is set as the first power partition, thereby forming a closed-loop power grid. In particular, the adjacent power partition can also be set as the power partition to the left of the current power partition. In this case, the power partition adjacent to the first power partition is the last power partition.

[0068] Furthermore, in the design of marine engineering vessels, the closed-loop power grid of dynamic positioning level 3 typically adopts a design with 3 power zones and a total of 6 generators; that is, as... Figure 1 As shown, this embodiment describes 3 power zones, 6 generator modules, 3 distribution board modules, 6 fast sensor modules, and 3 controllers.

[0069] like Figure 1 As shown, the closed-loop power grid generator voltage protection device of this embodiment is applicable to a closed-loop power grid including several adjacent power zones. Each power zone includes: several generator modules 1 and distribution board modules 2; the generator module 1 is electrically connected to the distribution board module 2 in its power zone; the distribution board module 2 is electrically connected to the distribution board module 2 in the power zones on both sides; the distribution board module 2 is electrically connected to the busbar 3.

[0070] The closed-loop power grid generator voltage protection device includes: several controllers 4 and several fast sensor modules 5;

[0071] Each of the power zones is equipped with a controller 4 and several fast sensor modules 5;

[0072] The controller 4 is electrically connected to the controller 4 in the two power zones respectively, and the controller 4 is electrically connected to the power distribution board module 2;

[0073] Each of the fast sensor modules 5 is electrically connected to each of the generator modules 1 in its respective power zone, and each of the fast sensor modules 5 is electrically connected to the controller 4 in its respective power zone; each of the fast sensor modules 5 is also electrically connected to the controller 4 in the adjacent power zone.

[0074] The fast sensor module 5 is used to detect the voltage feedback signal of the corresponding generator module 1, and when the detection result is a voltage feedback signal fault, it sends a fault signal to the controller 4 in the power zone and the controller 4 in the adjacent power zone.

[0075] The controller 4 is used to control the distribution board module 2 based on the fault signal and in combination with a preset time delay control method to realize closed-loop power grid generator voltage protection.

[0076] Please refer to Figure 2 , Figure 2 This is a schematic diagram illustrating the specific connection of a closed-loop power grid generator voltage protection device in a closed-loop power grid, as provided in an embodiment of the present invention.

[0077] In this embodiment, as Figure 2 As shown, the fast sensor module 5 includes: a first fast sensor 51 and a second fast sensor 52;

[0078] The voltage feedback signal detection output terminal of the first fast sensor 51 is electrically connected to the voltage feedback signal detection input terminal of the controller 4 in its respective power zone;

[0079] The voltage feedback signal detection output terminal of the second fast sensor 52 is electrically connected to the voltage feedback signal detection input terminal of the controller 4 in the adjacent power partition.

[0080] The voltage feedback signal detection terminal of the first fast sensor 51 is electrically connected to the voltage feedback signal output terminal of the generator module 1 in its respective power zone.

[0081] The voltage feedback signal detection terminal of the second fast sensor 52 is electrically connected one-to-one with the voltage feedback signal output terminal of the generator module 1 in its respective power zone;

[0082] The generator module electrically connected to the second fast sensor 52 is the same as the generator module 1 electrically connected to the first fast sensor 51.

[0083] It should be noted that the first fast sensor 51 and the second fast sensor 52 described in this embodiment are both multi-transducers, model DEIF MTR-4. The multi-transducer is a high-performance device designed for power parameter monitoring, supporting single-phase and three-phase systems, and can simultaneously measure key parameters such as voltage, current, power, and frequency.

[0084] This embodiment uses a first fast sensor and a second fast sensor to monitor the voltage feedback signal of the same generator module in parallel. This not only avoids signal delay or blockage in a single communication link, but also allows the voltage feedback signal of the generator module to more intuitively reflect the working status of the generator voltage in the closed-loop power grid. This ensures that the controller can respond to voltage feedback signal faults in a timely and efficient manner, thereby improving the efficiency of generator voltage protection in the closed-loop power grid.

[0085] In this embodiment, as Figure 2 As shown, the generator module 1 includes: a generator 11, a voltage sensor 12, and a generator voltage regulator 13;

[0086] The voltage output terminal of the generator 11 is electrically connected to the power distribution board module 2;

[0087] The voltage signal acquisition terminal of the voltage sensor 12 is electrically connected to the voltage output terminal of the generator 11;

[0088] The voltage feedback signal output terminal of the voltage sensor 12 is electrically connected to the voltage feedback signal input terminal of the generator voltage regulator 13;

[0089] The voltage feedback signal output terminal of the voltage sensor 12 serves as the voltage feedback signal output terminal of the generator module 1, and it is also electrically connected to the voltage feedback signal detection terminal of the first fast sensor 51.

[0090] The voltage feedback signal output terminal of the voltage sensor 12 is also electrically connected to the voltage feedback signal detection terminal of the second fast sensor 52.

[0091] The voltage regulation signal output terminal of the generator voltage regulator 13 is electrically connected to the voltage regulation signal input terminal of the generator 11;

[0092] The voltage sensor 12 is used to detect the voltage output by the generator 11 and generate a voltage feedback signal;

[0093] The generator voltage regulator 13 is used to receive the voltage feedback signal emitted by the voltage sensor 12, and generate a voltage regulation signal based on the voltage feedback signal to regulate the voltage of the generator 11.

[0094] It should be noted that the Automatic Voltage Regulator (AVR) counteracts load changes and speed fluctuations by adjusting the excitation current supplied to the generator's magnetic field in real time, thereby stabilizing the generator's output voltage at a preset constant value and ensuring the safe and reliable operation of various connected electrical devices. The Voltage Transformer (VT) is used to collect the generator's output voltage, thereby generating a voltage feedback signal.

[0095] This embodiment forms the basic architecture of a closed-loop power grid by linking a voltage sensor, a generator, and a generator voltage regulator. Then, by directly connecting the voltage feedback signal detection terminals of the first and second fast sensors to the voltage feedback signal output terminal of the voltage sensor, the voltage feedback signal of the generator can be directly detected. This not only allows for rapid acquisition of the generator voltage but also avoids interference from hidden faults in the generator voltage regulator on the voltage feedback signal, ensuring the detection accuracy and efficiency of the first and second fast sensors. This improves the accuracy and efficiency of generator voltage protection in the closed-loop power grid.

[0096] In this embodiment, as Figure 2 As shown, the power distribution module 2 includes: a plurality of generator switches 21, a first busbar switch 22, and a second busbar switch 23;

[0097] In each of the power zones, the number of generator switches 21 is the same as the number of generators 11;

[0098] The first terminal of each generator switch 21 is electrically connected to the voltage output terminal of its corresponding generator 11.

[0099] The second terminal of each generator switch 21 is electrically connected to the second terminal of the first busbar switch 22, or electrically connected to the first terminal of the second busbar switch 23;

[0100] The control signal input terminals of the first busbar switch 22, the second busbar switch 23, and each of the generator switches 21 are all electrically connected to the control signal output terminal of the controller 4.

[0101] The second terminal of the first busbar switch 22 is electrically connected to the first terminal of the second busbar switch 23;

[0102] In the first power zone of the closed-loop power grid, the first terminal of the first busbar switch 22 is electrically connected to the busbar 3;

[0103] In the closed-loop power grid, except for the first power zone, the first terminal of the first busbar switch 22 is electrically connected to the second terminal of the second busbar switch 23 in the power zone to its left.

[0104] In the last power section of the closed-loop power grid, the second terminal of the second busbar switch 23 is electrically connected to the busbar 3.

[0105] This embodiment, by setting up a distribution board module with several generator switches, a first busbar switch, and a second busbar switch, and through the cooperation of the generator switches and busbar switches, combined with the control of the controller, can quickly isolate the generator with voltage feedback signal fault from the closed-loop power grid, thereby preventing the spread of voltage runaway and achieving high efficiency and accuracy of closed-loop power grid generator voltage protection.

[0106] In this embodiment, as Figure 2 As shown, the communication terminal of the controller is electrically connected to the communication terminals of the controllers in the two power zones on both sides.

[0107] In this embodiment, the communication terminal of the controller is electrically connected to the communication terminals of the controllers in the two power zones respectively, realizing cross-power zone fault collaborative control. This avoids the delay and excessive time of closed-loop power grid generator voltage protection caused by the failure of a single controller, and improves the efficiency of closed-loop power grid generator voltage protection.

[0108] In this embodiment, the fast sensor module is used to detect the voltage feedback signal of the corresponding generator module, and when the detection result indicates a voltage feedback signal fault, it sends a fault signal to the controller in the corresponding power zone and the controller in the adjacent power zone, including:

[0109] The first fast sensor and the second fast sensor are both used to detect the voltage feedback signal of the corresponding generator module when the corresponding generator module is in the grid-connected state;

[0110] When the detection result indicates a voltage feedback signal fault, the first fast sensor is also used to send a fault signal to the controller in the power zone to which the first fast sensor belongs, and the second fast sensor is also used to send a fault signal to the controller in the power zone adjacent to the second fast sensor.

[0111] It should be noted that, since there are multiple power zones in a closed-loop power grid, and multiple generators in each power zone, the generators in the closed-loop power grid have two states: on-grid state and off-grid state. On-grid state means that the generator provides power to the electrical equipment in the closed-loop power grid through the busbar; while off-grid state means that the generator does not output power to the closed-loop power grid.

[0112] In an alternative embodiment, such as Figure 2 As shown, if the generator in the generator module is in a grid-connected state, the voltage feedback signal output by the voltage sensor is detected in real time through the first fast sensor and the second fast sensor. Voltage feedback signal faults include: open circuit of the voltage sensor connection line, phase loss of the connection line, loss of voltage feedback signal, etc. When the detection result is a voltage feedback signal fault, the first fast sensor sends a fault signal to the controller of the current power zone; the second fast sensor sends a fault signal to the controller of the power zone to its right.

[0113] This embodiment utilizes fast sensors to detect faults only when the generator module is in a grid-connected state, thus avoiding invalid operations caused by false alarms when the generator module is not in a grid-connected state. When a voltage feedback signal fault occurs, the first and second fast sensors send fault signals to the controllers of the relevant power zone and the adjacent power zone, respectively. This allows the controllers to directly isolate the generator module with the voltage feedback signal fault from the closed-loop grid based on the fault signal, improving the efficiency of closed-loop grid generator voltage protection. Furthermore, the redundant fault signal communication among multiple controllers avoids the inability to perform timely and efficient closed-loop grid generator voltage protection due to the failure of a single controller, achieving multi-level redundant protection and improving the stability and accuracy of closed-loop grid generator voltage protection.

[0114] In this embodiment, the controller is used to control the distribution board module based on the fault signal and in conjunction with a preset time delay control method to achieve closed-loop power grid generator voltage protection, including:

[0115] The controller is used to issue a first switch cut-off signal when it receives a fault signal sent by the first fast sensor, thereby controlling the power distribution board module to realize closed-loop power grid generator voltage protection.

[0116] The controller is also used to issue a second switch cut-off signal when the received fault signal sent by the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in the grid-connected state, thereby controlling the distribution board module to realize closed-loop grid generator voltage protection.

[0117] This embodiment achieves time delay control of the controller based on fault signals sent by the first and second fast sensors by setting a preset time threshold. The fault signal from the first fast sensor enables the controller to quickly isolate the generator module with voltage feedback signal faults from the closed-loop power grid through the control of the distribution board module. The preset time threshold also allows the controller in an adjacent power zone to control the distribution board module again based on the fault signal from the second fast sensor when the controller in the power zone to which the first fast sensor belongs cannot control the distribution board module. This achieves redundant distribution board module control, ensuring that generator modules with voltage feedback signal faults are quickly isolated from the closed-loop power grid, thus improving the efficiency and stability of generator voltage protection in the closed-loop power grid.

[0118] In this embodiment, the controller is used to issue a first switch-off signal when it receives a fault signal sent by the first fast sensor, thereby controlling the power distribution board module, including:

[0119] The controller is used to issue a first switch-off signal when it receives a fault signal sent by the first fast sensor, so as to cut off the generator switch corresponding to the generator module with the voltage feedback signal fault.

[0120] This embodiment enables fast and accurate closed-loop power grid generator voltage protection by directly cutting off the generator switch corresponding to the generator module whose voltage feedback signal has failed when the controller receives a fault signal from the first fast sensor in this power zone. This avoids the excessive time required by comparison and voting in the prior art, thus improving the efficiency of closed-loop power grid generator voltage protection.

[0121] In this embodiment, the controller is further configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold, and the generator module corresponding to the second fast sensor is in a grid-connected state, thereby controlling the distribution board module, including:

[0122] The controller is also configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in an on-grid state, so as to disconnect the second busbar switch of the left power zone and the first busbar switch of the right power zone of the generator module with voltage feedback signal fault.

[0123] In this embodiment, the controller of the adjacent power zone, after receiving the fault signal from the second fast sensor and after a preset time threshold, if the generator module with the faulty voltage feedback signal is still in the grid and has not been separated from the closed-loop power grid, disconnects the second busbar switch of the power zone to the left of the generator module with the faulty voltage feedback signal and the first busbar switch of the power zone to the right of the generator module with the faulty voltage feedback signal. This separates the power zone corresponding to the generator module with the faulty voltage feedback signal from the closed-loop power grid, thus achieving fast closed-loop power grid generator voltage protection.

[0124] In an optional embodiment, since the controllers are all connected to the communication terminals of the controllers in the two power zones, a redundant communication network is formed between the controllers, and the controllers in each power zone can obtain the relevant operations of the controllers in other power zones.

[0125] Furthermore, such as Figure 2 As shown, when the controller receives a fault signal sent by the first fast sensor, it indicates that the generator module with the voltage feedback signal fault belongs to the same power zone as the controller. At this time, the controller generates a first switch cut-off signal, which drives the generator switch corresponding to the generator module with the voltage feedback signal fault to be cut off, that is, disconnects the generator switch connected to the generator with the voltage feedback signal fault; thereby isolating the generator with the voltage feedback signal fault from the closed-loop power grid.

[0126] At the same time, since the second sensor also sends a fault signal to the controller in the right power zone, when the controller receives a fault signal sent by the second fast sensor, it indicates that the generator module with a voltage feedback signal fault is located in the left power zone of the controller.

[0127] In this embodiment, a preset time threshold of 150 milliseconds is set. Therefore, when the controller receives a fault signal sent by the second fast sensor for more than 150 milliseconds, if the generator module corresponding to the second fast sensor is in the grid-connected state at this time, it indicates that the controller in the power zone where the generator with the voltage feedback signal fault is located has a fault and cannot generate a first switch-off signal to isolate the generator with the voltage feedback signal fault from the closed-loop power grid. At this time, the controller generates a second switch-off signal and communicates through the redundant communication network between controllers to drive the controller of the power zone to the left of the generator with the voltage feedback signal fault to cut off the second busbar switch in its power zone, and the controller of the power zone to the right to cut off the first busbar switch in its power zone. Through such a cut-off operation, the power zone of the generator with the voltage feedback signal fault is disconnected from the busbar, thereby isolating the generator with the voltage feedback signal fault from the closed-loop power grid.

[0128] In one optional embodiment, after implementing closed-loop grid generator voltage protection, the method further includes: starting a corresponding number of generators that are not in the grid, based on the number of generators with voltage feedback signal faults.

[0129] This embodiment sets up controllers and several fast sensor modules in each power section of the closed power grid. Through the connection between the fast sensor modules and the generator modules, voltage feedback signals can be quickly acquired. By connecting the controllers, and through electrical connections between the fast sensor modules, the controllers of their respective power sections, and the controllers of adjacent power sections, redundant signal transmission paths can be formed in the closed-loop power grid. When a voltage feedback signal fault is detected, the fast sensor modules send the fault signal to the controllers in their respective power sections and the controllers in adjacent power sections. This allows the controllers to control the distribution board modules based on the fault signal, combined with a preset time-delay control method. This achieves closed-loop generator voltage protection, avoiding the time-consuming multi-parameter comparison and complex voting processes of traditional methods. Furthermore, the redundant control of multiple controllers prevents errors in closed-loop generator voltage protection caused by a single control malfunction, ensuring efficient closed-loop generator voltage protection.

[0130] Example 2

[0131] Please refer to Figure 3 , Figure 3 The flowchart of a control method for a closed-loop power grid generator voltage protection device provided in this embodiment of the invention includes steps S601 to S604; it is applicable to a closed-loop power grid including several adjacent power zones, each power zone including: several generator modules and distribution board modules; the generator modules are electrically connected to the distribution board modules in their respective power zones; the distribution board modules are electrically connected to the distribution board modules in the power zones on both sides; the distribution board modules are electrically connected to the busbar;

[0132] Step S601: Obtain the closed-loop power grid generator voltage protection device.

[0133] Step S602: In each of the power zones, a controller and several fast sensor modules are set up, wherein the controller is electrically connected to the controllers in the power zones on both sides, and the controller is electrically connected to the distribution board module; each fast sensor module is electrically connected to each generator module in its respective power zone, and each fast sensor module is electrically connected to the controller in its respective power zone; each fast sensor module is also electrically connected to the controller in the adjacent power zone.

[0134] Step S603: Control the fast sensor module to detect the voltage feedback signal of the corresponding generator module, and when the detection result is a voltage feedback signal fault, control the fast sensor module to send a fault signal to the controller in the power zone and the controller in the adjacent power zone.

[0135] Step S604: The drive controller controls the distribution board module based on the fault signal and in conjunction with a preset time delay control method to achieve closed-loop power grid generator voltage protection.

[0136] It should be noted that for the specific implementation process of steps S601 to S604, please refer to the description of Embodiment 1. This embodiment will not elaborate further here.

[0137] This embodiment sets up controllers and several fast sensor modules in each power section of the closed power grid. Through the connection between the fast sensor modules and the generator modules, voltage feedback signals can be quickly acquired. By connecting the controllers, and through electrical connections between the fast sensor modules, the controllers of their respective power sections, and the controllers of adjacent power sections, redundant signal transmission paths can be formed in the closed-loop power grid. When a voltage feedback signal fault is detected, the fast sensor modules send the fault signal to the controllers in their respective power sections and the controllers in adjacent power sections. This allows the controllers to control the distribution board modules based on the fault signal, combined with a preset time-delay control method. This achieves closed-loop generator voltage protection, avoiding the time-consuming multi-parameter comparison and complex voting processes of traditional methods. Furthermore, the redundant control of multiple controllers prevents errors in closed-loop generator voltage protection caused by a single control malfunction, ensuring efficient closed-loop generator voltage protection.

[0138] In summary, this embodiment of the invention, by setting up controllers and several fast sensor modules in each power section of a closed power grid, and by connecting the fast sensor modules to the generator modules, can quickly acquire voltage feedback signals. Through electrical connections between controllers, and between the fast sensor modules, the controllers of their respective power sections, and the controllers of adjacent power sections, redundant signal transmission paths can be formed in the closed-loop power grid. When a voltage feedback signal fault is detected, the fast sensor modules send the fault signal to the controllers in their respective power sections and the controllers of adjacent power sections. This allows the controllers to control the distribution board modules based on the fault signal, combined with a preset time-delay control method. This achieves closed-loop generator voltage protection, avoiding the time-consuming multi-parameter comparison and complex voting processes of traditional methods. Furthermore, the redundant control of multiple controllers prevents errors in closed-loop generator voltage protection caused by a single control failure, ensuring efficient closed-loop generator voltage protection.

[0139] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A closed-loop power grid generator voltage protection device, applicable to a closed-loop power grid comprising several adjacent power zones, each power zone comprising: Several generator modules and switchboard modules; The generator module is electrically connected to the distribution board module in its power zone; the distribution board module is electrically connected to the distribution board modules in the power zones on both sides. The power distribution board module is electrically connected to the busbar; The closed-loop power grid generator voltage protection device is characterized by comprising: several controllers and several fast sensor modules; Each of the aforementioned power zones is equipped with a controller and several fast sensor modules; The controller is electrically connected to the controllers in the two power zones on both sides, and the controller is electrically connected to the power distribution board module; Each of the fast sensor modules is electrically connected to each of the generator modules in its respective power zone, and each of the fast sensor modules is electrically connected to the controller in its respective power zone; each of the fast sensor modules is also electrically connected to the controller in its adjacent power zone. The fast sensor module is used to detect the voltage feedback signal of the corresponding generator module, and when the detection result is a voltage feedback signal fault, it sends a fault signal to the controller in the power zone to which it belongs and the controller in the adjacent power zone. The controller is used to control the distribution board module based on the fault signal and in combination with a preset time delay control method to achieve closed-loop power grid generator voltage protection.

2. The closed-loop power grid generator voltage protection device as described in claim 1, characterized in that, The fast sensor module includes: a first fast sensor and a second fast sensor; The voltage feedback signal detection output terminal of the first fast sensor is electrically connected to the voltage feedback signal detection input terminal of the controller in its respective power zone; The voltage feedback signal detection output terminal of the second fast sensor is electrically connected to the voltage feedback signal detection input terminal of the controller in the adjacent power partition. The voltage feedback signal detection terminal of the first fast sensor is electrically connected one-to-one with the voltage feedback signal output terminal of the generator module in its respective power zone. The voltage feedback signal detection terminal of the second fast sensor is electrically connected one-to-one with the voltage feedback signal output terminal of the generator module in its respective power zone; The generator module electrically connected to the second fast sensor is the same as the generator module electrically connected to the first fast sensor.

3. The closed-loop power grid generator voltage protection device as described in claim 2, characterized in that, The generator module includes: a generator, a voltage sensor, and a generator voltage regulator; The voltage output terminal of the generator is electrically connected to the power distribution board module; The voltage signal acquisition terminal of the voltage sensor is electrically connected to the voltage output terminal of the generator; The voltage feedback signal output terminal of the voltage sensor is electrically connected to the voltage feedback signal input terminal of the generator voltage regulator; The voltage feedback signal output terminal of the voltage sensor serves as the voltage feedback signal output terminal of the generator module, and it is also electrically connected to the voltage feedback signal detection terminal of the first fast sensor. The voltage feedback signal output terminal of the voltage sensor is also electrically connected to the voltage feedback signal detection terminal of the second fast sensor. The voltage regulation signal output terminal of the generator voltage regulator is electrically connected to the voltage regulation signal input terminal of the generator; The voltage sensor is used to detect the voltage output by the generator and generate a voltage feedback signal; The generator voltage regulator is used to receive the voltage feedback signal from the voltage sensor and generate a voltage regulation signal based on the voltage feedback signal to regulate the voltage of the generator.

4. The closed-loop power grid generator voltage protection device as described in claim 3, characterized in that, The power distribution board module includes: several generator switches, a first busbar switch, and a second busbar switch; In each of the power zones, the number of generator switches is the same as the number of generators; The first terminal of each generator switch is electrically connected to the voltage output terminal of its corresponding generator. The second terminal of each generator switch is electrically connected to the second terminal of the first busbar switch, or electrically connected to the first terminal of the second busbar switch; The control signal input terminals of the first busbar switch, the second busbar switch, and each of the generator switches are all electrically connected to the control signal output terminal of the controller. The second terminal of the first busbar switch is electrically connected to the first terminal of the second busbar switch. In the first power zone of the closed-loop power grid, the first terminal of the first busbar switch is electrically connected to the busbar; In the closed-loop power grid, except for the first power zone, the first terminal of the first busbar switch is electrically connected to the second terminal of the second busbar switch in the power zone to its left. In the last power section of the closed-loop power grid, the second terminal of the second busbar switch is electrically connected to the busbar.

5. A closed-loop power grid generator voltage protection device as described in claim 4, characterized in that, The fast sensor module is used to detect the voltage feedback signal of the corresponding generator module, and when the detection result indicates a voltage feedback signal fault, it sends a fault signal to the controller in the corresponding power zone and the controller in the adjacent power zone, including: The first fast sensor and the second fast sensor are both used to detect the voltage feedback signal of the corresponding generator module when the corresponding generator module is in the grid-connected state; When the detection result indicates a voltage feedback signal fault, the first fast sensor is also used to send a fault signal to the controller in the power zone to which the first fast sensor belongs, and the second fast sensor is also used to send a fault signal to the controller in the power zone adjacent to the second fast sensor.

6. The closed-loop power grid generator voltage protection device as described in claim 5, characterized in that, The controller is used to control the distribution board module based on the fault signal and in conjunction with a preset time delay control method to achieve closed-loop power grid generator voltage protection, including: The controller is used to issue a first switch cut-off signal when it receives a fault signal sent by the first fast sensor, thereby controlling the power distribution board module to realize closed-loop power grid generator voltage protection. The controller is also used to issue a second switch cut-off signal when the received fault signal sent by the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in the grid-connected state, thereby controlling the distribution board module to realize closed-loop grid generator voltage protection.

7. A closed-loop power grid generator voltage protection device as described in claim 6, characterized in that, The controller is used to issue a first switch-off signal when it receives a fault signal sent by the first fast sensor, thereby controlling the power distribution board module, including: The controller is used to issue a first switch-off signal when it receives a fault signal sent by the first fast sensor, so as to cut off the generator switch corresponding to the generator module with the voltage feedback signal fault.

8. A closed-loop power grid generator voltage protection device as described in claim 6, characterized in that, The controller is further configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold, and the generator module corresponding to the second fast sensor is in a grid-connected state, thereby controlling the distribution board module, including: The controller is also configured to issue a second switch-off signal when the received fault signal from the second fast sensor exceeds a preset time threshold and the generator module corresponding to the second fast sensor is in an on-grid state, so as to disconnect the second busbar switch of the left power zone and the first busbar switch of the right power zone of the generator module with voltage feedback signal fault.

9. A closed-loop power grid generator voltage protection device as described in claim 4, characterized in that, The communication terminal of the controller is electrically connected to the communication terminals of the controllers in the two power zones on both sides.

10. A control method for a closed-loop power grid generator voltage protection device, applicable to a closed-loop power grid comprising several adjacent power zones, each of the power zones comprising: Several generator modules and switchboard modules; The generator module is electrically connected to the switchboard module in its respective power zone; The power distribution module is electrically connected to the power distribution modules in the power zones on both sides; The power distribution board module is electrically connected to the busbar; The control method is characterized by comprising: Obtain the closed-loop power grid generator voltage protection device as described in any one of claims 1 to 9; Each power zone is equipped with a controller and several fast sensor modules. The controller is electrically connected to the controllers in the power zones on both sides, and the controller is also electrically connected to the distribution board module. Each fast sensor module is electrically connected to each generator module in its respective power zone, and each fast sensor module is also electrically connected to the controller in its respective power zone. Each fast sensor module is also electrically connected to the controller in the power zone on its adjacent side. The fast sensor module is controlled to detect the voltage feedback signal of the corresponding generator module, and when the detection result is a voltage feedback signal fault, the fast sensor module is controlled to send a fault signal to the controller in the power zone and the controller in the adjacent power zone. Based on the fault signal, the drive controller controls the distribution board module in conjunction with a preset time delay control method to achieve closed-loop power grid generator voltage protection.

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