CN114447884A - Continuous power supply control method, device and system - Google Patents
Continuous power supply control method, device and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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Abstract
The embodiment of the invention relates to the technical field of power control, and discloses a continuous power supply device which is applied to a device for connecting a generator and a propulsion frequency converter and comprises the following components: detecting and determining a fault type of the generator and determining the propulsion power after the generator is disconnected; determining the extension time for sending the brake-separating control signal according to the fault type; sending the opening control signal after the prolonged time is continued; and disconnecting the generator according to the opening control signal, and controlling the propulsion frequency converter to act according to the propulsion power. The invention provides a continuous power supply control method, a device and a system, which reasonably utilize the power of a generator to supply power to a power system as continuously as possible.
Description
Technical Field
The embodiment of the invention relates to the technical field of power control, in particular to a continuous power supply control method, device and system.
Background
With the continuous development of power electronics and variable-frequency speed regulation technology, the electric propulsion mode of ships gradually shows greater advantages than the traditional mechanical propulsion mode, and more ships adopt the electric propulsion mode. The Integrated Power System (IPS) is developed from a conventional electric propulsion ship electric Power System, not only considers the safety and stability of the electric Power System, but also integrates the Power generation and supply of ships, the Power consumption for propulsion and the Power consumption of other equipment into a unified System, thereby realizing the unified scheduling and centralized control of the Power generation, Power distribution, the Power consumption for electric propulsion and the Power consumption of other equipment.
The power supply continuity is a part of energy management, and plays a great role in an electrically propelled ship. When the load exceeds 95% of the power of the generator or the power generation system is in failure, under the condition that the power of the generator exceeds 95% of the power of the generator, the propelling power with the maximum power demand needs to be rapidly reduced, and the power system is ensured not to lose power of the whole ship due to overload.
For a ship power system, when the load exceeds 95% of the power of the generator or the power generation system is in failure, the generator is immediately disconnected and the propulsion power is reduced under the condition that the power of the generator exceeds 95% of the power of the generator, which causes power waste of the generator.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a continuous power supply control method, apparatus, and system that can reasonably use the power of a generator to supply power to a power system as continuously as possible.
In order to solve the above technical problem, an embodiment of the present invention provides a continuous power supply apparatus applied to an apparatus for connecting a generator and a propulsion converter, including: detecting and determining a fault type of the generator and determining the propulsion power after the generator is disconnected; determining the extension time for sending the brake-separating control signal according to the fault type; the opening control signal is sent out after the prolonged time is continued; and disconnecting the generator according to the opening control signal, and controlling the propulsion frequency converter to act according to the propulsion power.
In addition, the determining the extension time for sending the opening control signal according to the fault type comprises the following steps: when the fault type is determined to be overcurrent protection, determining an overload multiple according to the actual overcurrent and action protection current of the generator; and determining the extension time for sending the brake-separating control signal according to the overload multiple and the corresponding relation between the preset overload multiple and the extension time.
In addition, the determining the extension time for sending the opening control signal according to the fault type comprises the following steps: when the fault type is determined to be overcurrent protection, determining the extension time for sending the opening control signal according to the actual overcurrent of the generator and the action protection current by using a time limit formula; the time limit formula is as follows:
and t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is a time constant.
An embodiment of the present invention also provides a continuous power supply apparatus, including: the system comprises a plurality of state detection and protection modules and a propulsion control module, wherein the state detection and protection modules are used for being connected with a generator, the propulsion control module is used for being connected with a propulsion frequency converter, and the state detection and protection modules are connected with the propulsion control module; the state detection and protection module is used for detecting and determining the fault type of the generator; the propulsion control module is used for determining the propulsion power after the generator is disconnected when the state detection and protection module determines the fault type of the generator; the state detection and protection module is also used for determining the extension time for sending the opening control signal according to the fault type, outputting the opening control signal to the propulsion control module after the extension time is continued, and disconnecting the generator according to the opening control signal; the propulsion control module is also used for controlling the action of the propulsion frequency converter according to the opening control signal and the propulsion power.
In addition, the state detection and protection module is used for determining an overload multiple according to the actual overcurrent and the action protection current of the generator when the fault type is determined to be overcurrent protection, and determining the extension time for sending the opening control signal according to the overload multiple and the corresponding relation between the preset overload multiple and the extension time.
In addition, the state detection and protection module is used for determining the prolonged time for sending the opening control signal according to the actual overcurrent and action protection current of the generator by using a time limit formula when the fault type is determined to be overcurrent protection; wherein the time limit formula is as follows:
and t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is a time constant.
In addition, the state detection and protection module is configured to determine that the extension time for sending the opening control signal is 0 when determining that the fault type is any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection, and underexcitation protection.
The embodiment of the invention also provides a continuous power supply system, a plurality of generators, a propulsion frequency converter and the continuous power supply device connected with the generators and the propulsion frequency converter.
In addition, the propulsion frequency converter is a plurality of, and the propulsion control module is connected a plurality of the propulsion frequency converter.
The embodiment of the invention provides a continuous power supply control method, which is applied to a device for connecting a generator and a propulsion frequency converter, and is used for detecting and determining the fault type of the generator and determining the propulsion power after the generator is disconnected, so that the extension time for sending a brake-separating control signal is determined according to the fault type, the brake-separating control signal is sent out after the extension time is continued, the power waste caused by immediately sending the brake-separating control signal to disconnect the generator is avoided, the power of the generator is reasonably utilized to supply power to an electric power system as continuously as possible, the generator is disconnected according to the brake-separating control signal after the extension time is continued to control the action of the propulsion frequency converter according to the propulsion power after the generator is disconnected, and the power loss of the whole electric power system caused by the overload of the propulsion frequency converter is avoided.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.
FIG. 1 is a schematic flow chart of a method for continuous power supply according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a continuous power supply apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a continuous power supply system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.
The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.
The embodiment of the invention relates to a continuous power supply method, which is applied to a device for connecting a generator and a propulsion frequency converter, and is characterized in that the fault type of the generator is detected and determined, and the propulsion power after the generator is disconnected is determined, so that the extension time for sending a brake-separating control signal is determined according to the fault type, the brake-separating control signal is sent out after the extension time is continued, the waste of power caused by immediately sending the brake-separating control signal to disconnect the generator is avoided, the power of the generator is reasonably utilized to supply power to an electric power system as continuously as possible, the generator is disconnected according to the brake-separating control signal after the extension time is continued, so that the propulsion frequency converter is controlled to act according to the propulsion power after the generator is disconnected, and the power loss of the whole electric power system caused by the overload of the propulsion frequency converter is avoided.
The following describes in detail the implementation details of the continuous power supply device according to the present embodiment, and the following description is provided only for the sake of understanding and is not necessary for implementing the present embodiment.
Fig. 1 is a schematic flow chart of the continuous power supply method in the present embodiment:
step S11: the type of fault of the generator is detected and determined, and the propulsion power after disconnecting the generator is determined.
The continuous power supply method in this embodiment is applied to a device that connects a generator and a propulsion converter. The voltage and current signals of the generator, the protection output signal of the main switch of the generator and the like are detected to determine whether the generator has faults or not, and the fault type of the generator is specifically determined, and meanwhile, the propelling power after the generator is disconnected is also determined. For example, a current signal of the generator is detected to determine whether the generator is over-current; detecting a voltage signal of the generator to determine whether the generator is over-voltage or under-voltage; the excitation signal of the generator is detected to determine whether the generator is over-excited or under-excited.
Step S11: and determining the extension time for sending the brake-separating control signal according to the fault type.
Specifically, since the time from the occurrence of the fault of the generator to the time that the power system is powered off is different according to different fault types, the time for which the generator can continuously supply power is different when the fault type of the generator is different, and the time for which the opening control signal is sent needs to be determined according to the specific fault type.
Step S13: and sending a brake-off control signal after the duration is prolonged.
Step S14: and disconnecting the generator according to the opening control signal and controlling the action of the propulsion frequency converter by the propulsion power.
After the extension time for sending the opening control signal is determined according to the fault type of the generator, the generator is maintained to continue to operate for the extension time, namely, the generator is allowed to operate for a short time under an extreme working condition, so that the power waste caused by the fact that the fault generator immediately sends the opening control signal to disconnect the generator is avoided, and the power of the generator is reasonably utilized to continuously supply power to the power system as far as possible; and after the duration is prolonged, a re-opening control signal is sent, the generator is disconnected according to the re-opening control signal, and the action of the propulsion frequency converter is controlled by the propulsion power after the generator is disconnected, so that the power loss of the whole power system caused by the overload of the propulsion frequency converter is avoided.
Because the fault generator in the embodiment cannot immediately send out the opening control signal, the generator additionally runs for the prolonged time under the extreme working condition after the fault, the propelling power after the generator is disconnected is calculated in the prolonged time, the extra time for calculating the propelling power after the generator is disconnected is avoided, the operation of reducing the propelling power of the propelling frequency converter can be executed more quickly, and the power supply continuity of the system can be ensured.
In one example, the determining the extension time for issuing the opening control signal according to the fault type comprises: when the fault type is determined to be overcurrent protection, determining an overload multiple according to the actual overcurrent and the action protection current of the generator; and determining the extension time for sending the brake-separating control signal according to the overload multiple and the preset corresponding relation between the overload multiple and the extension time.
In this embodiment, when the fault type is overcurrent protection, the overload multiple of the actual overcurrent is determined, and the extension time for sending the opening control signal when the generator is subjected to overcurrent protection is determined according to the preset corresponding relationship between the overload multiple and the extension time. The correspondence between the overload factor and the extension time is, for example: overload by 1.1 times, and prolong for 1 hour; overload by 1.2 times, and prolong for 1 minute; overload by 1.3 times, and the prolonging time is 30 seconds; overload by 1.5 times, and the prolonging time is 10 s; overload 2 times, allow an extension time of 20 milliseconds. It should be noted that the correspondence between the loading factor and the extension time is only an example, and can be set according to actual needs in practical applications.
In another example, determining the extended time for issuing the opening control signal according to the type of the fault includes: when the fault type is determined to be overcurrent protection, determining the extension time for sending the brake-separating control signal according to the actual overcurrent of the generator and the action protection current by using a time limit formula;
the time limit formula is shown in the following formula (1):
wherein t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is the time constant.
In the present embodiment, when the fault type is the overcurrent protection, the extended time for issuing the opening control signal is calculated by the time limit formula (1), wherein the time constant k can be set to 0.2 hour according to the actual situation. The selection of the parameters r and k can be determined according to actual conditions.
In one example, determining the extended time for issuing the opening control signal according to the fault type includes: and when the fault type is determined to be any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection and underexcitation protection, determining that the extension time for sending the brake-separating control signal is 0.
Specifically, when the fault type of the generator is any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection and underexcitation protection, the generator set does not have a normal output function, so that the extension time of the generator is 0, namely, when the generator is determined to have the differential protection, the generator with the differential protection is immediately disconnected, the propulsion power after the load is reduced is determined, the propulsion frequency converter is controlled to operate by the propulsion power after the load is reduced, and the condition that the whole power system is powered off due to the overload of the propulsion frequency converter is avoided.
Compared with the prior art, the continuous power supply method provided by the embodiment of the invention is mainly used for ensuring the power supply continuity of the comprehensive power system under different configuration conditions, preventing the power loss condition of the power system caused by overload, and particularly quickly unloading the propulsion load under the condition that the power systems of different power generators and high-power generators are tripped due to short circuit and the like.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
An embodiment of the present invention relates to a continuous power supply apparatus, as shown in fig. 2, including: the system comprises a plurality of state detection and protection modules 11 and a propulsion control module 12, wherein the state detection and protection modules 11 are used for being connected with a generator, the propulsion control module 12 is used for being connected with a propulsion frequency converter, the state detection and protection modules 11 are connected with the propulsion control module 12, and each state detection and protection module 11 is correspondingly connected with 1 generator. In practical application, there may be a plurality of propulsion control modules 12, the state detection and protection modules 11 are connected to the propulsion control modules 12 in a one-to-one correspondence manner, and each propulsion control module 12 is correspondingly connected to and controls 1 propulsion frequency converter.
The state detection and protection module 11 is used for detecting and determining the fault type of the generator; the propulsion control module 12 is used for determining the propulsion power after the generator is disconnected when the state detection and protection module 11 determines the fault type of the generator; the state detection and protection module 11 is further configured to determine an extension time for sending the opening control signal according to the fault type, output the opening control signal to the propulsion control module 12 after the extension time is continued, and disconnect the generator according to the opening control signal; the propulsion control module 12 is further configured to control the propulsion frequency converter to act according to the opening control signal and the propulsion power.
Specifically, the state detection and protection module 11 is installed at a main switch of the generator, a bus tie switch and other parts, detects the state of each switch, a protection output signal of the main switch and the power condition, directly adopts a hall element to directly collect voltage and current signals of a direct current end for collecting power signals, and calculates various signals of the generator such as power. Determining whether the generator fails or not according to the signals, and specifically determining the type of the generator failure, for example, detecting a current signal of the generator to determine whether the generator is over-current or not; detecting a voltage signal of the generator to determine whether the generator is over-voltage or under-voltage; the excitation signal of the generator is detected to determine whether the generator is over-excited or under-excited.
The state detection and protection module 11 sends various signals of the detected generator to the propulsion control module 12 in real time through the optical fiber, and the propulsion control module 12 receives various signals of the generator sent by the detection and protection module, for example: the state of each switch, the protection output signal, the power signal of each generator, etc.
The propulsion control module 12 automatically confirms the topology state of the operation of the power system (excluding the generator with a fault) according to various signals of each generator in the power system, and calculates the power actual power Pm and the grid unit rated power Pe of the power system according to the topology structure of the power system. Thus, after the failed generator is disconnected, the propulsion control module 12 needs to reduce the propulsion power (Pm-0.9Pe) to ensure that the loads of other generators in the power system operate below 90%.
The state detection and protection module 11 integrates 6 paths of voltage interfaces, 4 paths of current interfaces and 8 paths of switching value interfaces of the Hall sensor, and integrates an optical fiber communication interface. The detection time of the Hall sensor for voltage and current can be reduced to a 50us level. The state detection and protection module 11 integrates 16 SFP high-speed optical fiber interfaces (expandable), and all signals are transmitted through the SFP high-speed optical fiber modules, so that interference caused by transmission lines is greatly reduced.
Optionally, the state detection and protection module 11 is configured to, when it is determined that the fault type is overcurrent protection, determine an overload multiple according to an actual overcurrent of the generator and the action protection current, and determine the extension time for sending the opening control signal according to the overload multiple and a preset correspondence between the overload multiple and the extension time.
In this embodiment, when the fault type is overcurrent protection, the overload multiple of the actual overcurrent is determined, and the extension time for sending the opening control signal when the generator is subjected to overcurrent protection is determined according to the preset corresponding relationship between the overload multiple and the extension time. The correspondence between the overload factor and the extension time is, for example: overload is 1.1 times, and the extension time is 1 hour; overload by 1.2 times, and prolong for 1 minute; overload by 1.3 times, and the prolonging time is 30 seconds; overload by 1.5 times, and the prolonging time is 10 s; overload 2 times, allow an extension time of 20 milliseconds. It should be noted that the correspondence between the loading factor and the extension time is only an example, and can be set according to actual needs in practical applications.
Optionally, the state detection and protection module 11 is configured to determine, when it is determined that the fault type is overcurrent protection, an extended time for issuing a tripping control signal according to an actual overcurrent of the generator and an action protection current by using a time limit formula;
wherein, the time limit formula is shown as the following formula (2):
t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is the time constant.
In the present embodiment, when the fault type is the overcurrent protection, the extended time for issuing the opening control signal is calculated by the time limit formula (1), wherein the time constant k can be set to 0.2 hour according to the actual situation. The selection of the parameters r and k can be determined according to actual conditions.
Optionally, the state detection and protection module 11 is configured to determine that the extended time for issuing the opening control signal is 0 when determining that the fault type is any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection, and underexcitation protection.
Specifically, when the fault type of the generator is any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection and underexcitation protection, the generator set does not have a normal output function, so that the extension time of the generator is 0, namely, when the generator is determined to have the differential protection, the generator with the differential protection is immediately disconnected, the propulsion power after the load is reduced is determined, the propulsion frequency converter is controlled to operate by the propulsion power after the load is reduced, and the condition that the whole power system is powered off due to the overload of the propulsion frequency converter is avoided.
The embodiment starts from a comprehensive protection strategy, optimizes the protection time of the system, combines protection and propulsion power control, and provides an integrated implementation method for power supply continuity.
The embodiment greatly reduces the time required by data detection and processing, ensures that the power control overload time is within 40ms, and meets the requirement of power supply continuity under configurations of high and low power and the like.
In the embodiment, the device state detection and protection module 11 adopts a Hall element to directly acquire voltage and current data, and simultaneously adopts a switching-off control signal for protecting a generator to prejudge the switching state, so that the limitation on the power is realized in advance by 5-10ms, and simultaneously adopts SFP high-speed optical fibers to transmit signals, the transmission rate can reach 10GB/s, the method and the measures can greatly reduce the time for signal acquisition and transmission, and ensure that the power limitation time is within 40 ms.
In the comprehensive electric power ship, because each electric power device has larger power and higher voltage level, generally AC6600V or DC4000V, has stronger electromagnetic interference, the transmission with a shielding twisted pair line has limited anti-interference energy, local data acquisition is adopted, and a method of optical fiber communication is adopted among the devices, so that the interference in the line transmission process can be effectively shielded.
The propulsion control module 12 of this embodiment receives signals sent by the status detection and protection modules 11 in each power system, and can automatically identify the topology structure of the power system, calculate the load of the power system where the propeller is located, and accurately control the reduction of the power under the condition of overload.
The embodiment of the present invention further relates to a continuous power supply system, as shown in fig. 3, including a plurality of generators 2, a propulsion frequency converter 3, and the continuous power supply apparatus 1 connected to the plurality of generators 2 and the propulsion frequency converter 3. Wherein, each generator 2 is correspondingly connected with 1 state detection and protection module 11.
Optionally, there are a plurality of propulsion frequency converters 3, and the propulsion control module 12 is connected to the plurality of propulsion frequency converters 3.
The continuous power supply device 1 in this embodiment can be applied to a power system of a medium-voltage dc/ac integrated electric power ship, and the power system of the integrated electric power ship includes generators 2 with different power levels and a propulsion frequency converter 3. In combination with the actual situation of the integrated power vessel, the status detection and protection module 11 of the continuous power supply apparatus 1 may be installed on the distribution board where the main switch of each generator 2 is located, and the propulsion control module 12 may be installed at the same place as the controller of the propulsion frequency converter 3. Alternatively, each status detecting and protecting module 11 may be integrated as a function into the controller of each generator 2, and the propulsion control module 12 may be integrated as a function into the propulsion controller of the propulsion frequency converter 3, with certain changes in the implementation form.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A method for controlling continuous power supply, applied to a device for connecting a generator to a propulsion converter, comprising:
detecting and determining the fault type of the generator and determining the propulsion power after disconnecting the generator;
determining the extension time for sending the brake-separating control signal according to the fault type;
sending the opening control signal after the prolonged time is continued;
and disconnecting the generator according to the opening control signal and controlling the propulsion frequency converter to act according to the propulsion power.
2. The continuous power supply device according to claim 1, wherein the determining the extended time for issuing the opening control signal according to the fault type includes:
when the fault type is determined to be overcurrent protection, determining an overload multiple according to the actual overcurrent and the action protection current of the generator;
and determining the extension time for sending the brake-separating control signal according to the overload multiple and the corresponding relation between the preset overload multiple and the extension time.
3. The continuous power supply device according to claim 1, wherein the determining the extended time for issuing the opening control signal according to the fault type includes:
when the fault type is determined to be overcurrent protection, determining the extension time for sending the opening control signal according to the actual overcurrent of the generator and the action protection current by using a time limit formula;
the time limit formula is as follows:
and t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is a time constant.
4. The continuous power supply device according to claim 1 or 2, wherein the determining the extended time for issuing the opening control signal according to the fault type includes:
and when the fault type is determined to be any one of differential protection, overvoltage protection, undervoltage protection, overexcitation protection and underexcitation protection, determining that the extension time for sending the opening control signal is 0.
5. A continuous power supply device, comprising: the system comprises a plurality of state detection and protection modules and a propulsion control module, wherein the state detection and protection modules are used for being connected with a generator, the propulsion control module is used for being connected with a propulsion frequency converter, and the state detection and protection modules are connected with the propulsion control module;
the state detection and protection module is used for detecting and determining the fault type of the generator;
the propulsion control module is used for determining the propulsion power after the generator is disconnected when the state detection and protection module determines the fault type of the generator;
the state detection and protection module is also used for determining the extension time for sending the opening control signal according to the fault type, outputting the opening control signal to the propulsion control module after the extension time is continued, and disconnecting the generator according to the opening control signal;
the propulsion control module is also used for controlling the action of the propulsion frequency converter according to the opening control signal and the propulsion power.
6. The continuous power supply device according to claim 5, wherein the status detecting and protecting module is configured to determine an overload multiple according to an actual overcurrent and an operation protection current of the generator when the fault type is determined to be overcurrent protection, and determine the delay time for sending the opening control signal according to the overload multiple and a preset corresponding relationship between the overload multiple and the delay time.
7. The continuous power supply device according to claim 5, wherein the status detection and protection module is configured to determine the extended time for issuing the tripping control signal according to a time limit formula based on an actual overcurrent and an active protection current of the generator when the fault type is determined to be overcurrent protection;
wherein the time limit formula is as follows:
and t is the extension time, Ip is the action protection current, I is the actual overcurrent, r takes a value of 0-3, and k is a time constant.
8. The continuous power supply device according to claim 2, wherein the status detection and protection module is configured to determine that the extended time for issuing the opening control signal is 0 when determining that the fault type is any one of differential protection, over-voltage protection, under-voltage protection, over-excitation protection, and under-excitation protection.
9. A continuous power supply system comprising a plurality of generators, a propulsion converter, a continuous power supply apparatus according to any one of claims 5 to 8 connected to a plurality of said generators and said propulsion converter;
and each generator is correspondingly connected with 1 state detection and protection module.
10. The continuous power supply system of claim 9, wherein the number of propulsion converters is plural, and the propulsion control module is connected to the plural propulsion converters.
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