CN116599134A - Isolated network operation method, system, terminal equipment and storage medium - Google Patents
Isolated network operation method, system, terminal equipment and storage medium Download PDFInfo
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- CN116599134A CN116599134A CN202310611097.9A CN202310611097A CN116599134A CN 116599134 A CN116599134 A CN 116599134A CN 202310611097 A CN202310611097 A CN 202310611097A CN 116599134 A CN116599134 A CN 116599134A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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Abstract
The application relates to the technical field of smart grids, in particular to a method, a system, terminal equipment and a storage medium for isolated network operation. If the operation state is isolated network operation, the initial operation mode of the control target generator set is converted into a valve control operation mode; if the output parameters corresponding to the generator components in the valve control operation mode do not meet the plant electrical load standard, the rotating speed of the steam turbine is regulated according to the plant electrical load standard, and a corresponding rotating speed signal is generated; if the rotation speed fluctuation value corresponding to the rotation speed signal is not in the preset rotation speed fluctuation threshold value interval, a rotation speed compensation instruction corresponding to the rotation speed fluctuation difference is generated according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold value interval to regulate the rotation speed of the steam turbine. The isolated network operation method, the isolated network operation system, the terminal equipment and the storage medium provided by the application can reduce the abnormal influence on the generator set caused by the isolated network operation state when the bus outlet switch fails or the external network overhaul is disconnected.
Description
Technical Field
The application relates to the technical field of smart grids, in particular to a method, a system, terminal equipment and a storage medium for isolated network operation.
Background
Thermal power generation is a power generation mode in which chemical energy of fuel is converted into heat energy through combustion, then the heat energy is converted into kinetic energy, and finally the kinetic energy is converted into electric energy.
In general, a thermal power generation system is mainly composed of the following main parts: a fuel supply and disposal system, an important process for delivering fuel, which may be coal, oil, natural gas or household garbage, etc., to the boiler; a boiler system, which is an apparatus that burns fuel and generates high-temperature and high-pressure steam, which is formed in a boiler and is transferred to a steam turbine through a pipe; a steam turbine system in which turbine blades are propelled by the steam, thereby generating a rotational torque, the rotation of the turbine being transferred to a generator through a shaft; the generator system, when the turbine rotates, the inductor in the generator generates electric current which, after being collected and rectified, is fed into the transformer for feeding electric energy into the grid.
In practical application, when a bus outlet switch in a thermal power generation system is disconnected due to faults or overhauling of an external network, a generator set is stopped, or is in a isolated network running state, and in the isolated network running state, the load of the generator set cannot be balanced through a power grid, so that overload running of the generator set can be possibly caused, the problems of reverse power and the like are solved, and adverse effects can be caused on equipment and systems.
Disclosure of Invention
In order to reduce abnormal influence on a generator set caused by a bus outlet switch fault or an external network maintenance disconnection when the generator set is in a isolated network operation state, the application provides an isolated network operation method, an isolated network operation system, terminal equipment and a storage medium.
In a first aspect, the present application provides a method for operating a isolated network, including the steps of:
acquiring the corresponding running state of the target generator set;
if the operation state is isolated network operation, controlling the initial operation mode of the target generator set to be converted into a valve control operation mode;
obtaining output parameters corresponding to the generator component in the valve control operation mode;
if the output parameters do not accord with the plant electrical load standard, regulating the rotating speed of the steam turbine according to the plant electrical load standard, and generating a corresponding rotating speed signal;
if the rotation speed fluctuation value corresponding to the rotation speed signal is not in a preset rotation speed fluctuation threshold interval, generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval;
and generating a corresponding rotating speed compensating difference instruction according to the rotating speed fluctuation difference, and adjusting the rotating speed of the steam turbine according to the rotating speed compensating difference instruction.
By adopting the technical scheme, if the operation state of the target generator set is isolated operation, the initial operation mode of the target generator set is controlled to be converted into the valve control operation mode, the valve control operation mode can reduce the occurrence of the generator set fault condition caused by overload or other abnormal conditions when the target generator set is in isolated operation, thereby improving the reliability and safety of the generator set, further, in order to enable the target generator set to meet the plant electric load standard, the turbine speed is regulated according to the plant electric load standard, and a corresponding rotating speed signal is generated, if the rotating speed fluctuation value corresponding to the rotating speed signal is not in a preset rotating speed fluctuation threshold interval, the condition that the turbine speed has larger fluctuation is indicated, the current plant electric load is indirectly indicated, in order to enable the turbine speed to meet the current plant electric load demand in time, a corresponding rotating speed compensation instruction is generated according to the rotating speed fluctuation difference of the turbine, the rotating speed is regulated according to the rotating speed compensation instruction, and in order to enable the operating mode of the target generator set in isolated operation state to be adaptively converted, and in combination with the actual conditions, each operating parameter of the target generator set after the conversion operation mode is carried out, thereby reducing the influence on the abnormal operation state of the turbine generator set caused by the isolated operation state, and the fault condition is analyzed.
Optionally, the operation state includes an output parameter corresponding to the target generator set, and the method is characterized by further including the following steps after the operation state corresponding to the target generator set is obtained:
judging whether the output parameter is in a preset output parameter threshold interval or not;
if the output parameter is in a preset output parameter threshold interval, judging whether a isolated network operation input button corresponding to the target generator set is in an input state or not;
and if the isolated network operation input button corresponding to the target generator set is in the input state, judging that the operation state corresponding to the target generator set is the isolated network operation.
By adopting the technical scheme, whether the output parameter is in the preset output parameter threshold interval is judged according to the analysis of the output parameter corresponding to the target generator set, the accuracy of judging that the target generator set is in the off-grid state can be improved, further, whether the isolated grid operation input button corresponding to the current target generator set is in the input state is judged in order to determine that the target generator set is in the isolated grid operation, and the target generator set is in the isolated grid operation at the moment is judged if the target generator set is in the input state, so that the accuracy of judging that the target generator set is in the isolated grid operation state is improved, and corresponding measures can be timely taken to ensure the operation safety and stability of the generator set.
Optionally, if the operation state is isolated network operation, the step of controlling the initial operation mode of the target generator set to be converted into the valve control operation mode includes the following steps:
if the running state is the isolated network running, acquiring the initial running mode corresponding to the target generator set, wherein the initial running mode comprises main steam pressure control or power control and primary pumping or secondary pumping pressure control;
and controlling the target generator set to be converted into a valve control operation mode from main steam pressure control or power control, and one-extraction or two-extraction pressure control according to the steam turbine DEH system.
By adopting the technical scheme, the valve control operation mode can enable the stability of the target generator set to be higher, reduce the load fluctuation of the target generator set, and simultaneously realize the remote monitoring and fault diagnosis of the target generator set by performing control conversion through the steam turbine DEH system, thereby improving the reliability and safety of equipment.
Optionally, if the output voltage current value does not meet the station electric load standard, adjusting the rotation speed of the steam turbine according to the station electric load standard, and generating a corresponding rotation speed signal, further comprising the following steps: and leading the rotating speed signal to a servo board through a primary frequency modulation module to form a hardware primary frequency modulation loop.
By adopting the technical scheme, the primary frequency modulation module introduces the rotating speed signal into the servo board, so that the adaptive adjustment of the rotating speed of the generator set can be realized, and meanwhile, in the hardware primary frequency modulation loop, the control signal is directly transmitted to the servo board without software processing, so that the problems of software faults, calculation errors and the like can be reduced, and the stability and reliability of a control system are improved.
Optionally, the primary frequency modulation module includes an FM165 module, and after the rotation speed signal is led to the servo board by the primary frequency modulation module, the method further includes the following steps: and debugging hardware parameters of the FM165 module according to response requirements corresponding to the hardware primary frequency modulation loop.
By adopting the technical scheme, the hardware parameters of the FM165 module can be debugged to optimize the hardware primary frequency modulation loop, so that the response capability and the control precision of the system are improved.
Optionally, after the rotation speed signal is led to the servo board by the primary frequency modulation module to form a hardware primary frequency modulation loop, the method further comprises the following steps: the primary frequency modulation dead zone corresponding to the hardware primary frequency modulation loop is set to be +/-2 r/min, and no amplitude limitation is carried out
By adopting the technical scheme, the primary frequency modulation dead zone is set to be smaller + -2 r/min, so that the fluctuation range of the control signal can be reduced, the oscillation range of the system is effectively reduced, and the stability and control precision of the system are improved.
Optionally, after the initial operation mode of the target generator set is controlled to be converted into the valve control operation mode if the operation state is the isolated network operation, the method further includes the following steps: and if the oil switch corresponding to the target generator set is in the brake separating period, starting an overspeed limiting function of the generator set.
By adopting the technical scheme, equipment damage and faults of the target generator set caused by overhigh rotating speed can be reduced, so that the service life of the equipment is prolonged.
In a second aspect, the present application provides a isolated network operation system, including:
the first acquisition module is used for acquiring the corresponding running state of the target generator set;
the control module is used for controlling the initial operation mode of the target generator set to be converted into a valve control operation mode if the operation state is isolated network operation;
the second acquisition module is used for acquiring output parameters corresponding to the generator component in the valve control operation mode;
The first adjusting module is used for adjusting the rotating speed of the steam turbine according to the plant power load standard and generating a corresponding rotating speed signal if the output parameter does not accord with the plant power load standard;
the generation module is used for generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval if the rotation speed fluctuation value corresponding to the rotation speed signal is not in the preset rotation speed fluctuation threshold interval;
the second adjusting module is used for generating a corresponding rotating speed compensating difference instruction according to the rotating speed fluctuation difference and adjusting the rotating speed of the steam turbine according to the rotating speed compensating difference instruction.
By adopting the technical scheme, if the operation state of the target generator set is isolated network operation, the initial operation mode of the target generator set is controlled to be converted into the valve control operation mode by the control module, the valve control operation mode can reduce the occurrence of the generator set fault condition caused by overload or other abnormal conditions when the target generator set is in isolated network operation, thereby improving the reliability and safety of the generator set, in order to further enable the target generator set to meet the plant electric load standard, the turbine speed is regulated by the first regulation module according to the plant electric load standard, and a corresponding speed signal is generated, if the speed fluctuation value corresponding to the speed signal is not in the preset speed fluctuation threshold interval, the fact that the current plant electric load is greatly changed is indirectly indicated, in order to timely enable the turbine speed to meet the current plant electric load demand, the corresponding speed fluctuation difference is generated according to the generation module, the turbine speed difference command is immediately generated according to the speed difference command, the turbine speed is regulated according to the speed difference command, and the differential command is converted according to the plant electric load standard, and the conversion mode of the target generator set in isolated network operation state is carried out, and the current power generator set fault condition is combined with the current power generator set fault condition, thereby the fault condition is reduced, and the fault condition of the generator set is analyzed and the fault condition is controlled.
In a third aspect, the present application provides a terminal device, which adopts the following technical scheme:
the terminal equipment comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and when the processor loads and executes the computer instructions, the isolated network running method is adopted.
By adopting the technical scheme, the computer instruction is generated by the isolated network operation method and is stored in the memory to be loaded and executed by the processor, so that the terminal equipment is manufactured according to the memory and the processor, and the use is convenient.
In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:
a computer readable storage medium having stored therein computer instructions which, when loaded and executed by a processor, employ a isolated network method as described above.
By adopting the technical scheme, the computer instruction is generated by the isolated network operation method and is stored in the computer readable storage medium to be loaded and executed by the processor, and the computer instruction is convenient to read and store by the computer readable storage medium.
In summary, the present application includes at least one of the following beneficial technical effects: if the operation state of the target generator set is isolated network operation, the initial operation mode of the target generator set is controlled to be converted into a valve control operation mode, the valve control operation mode can reduce the occurrence of generator set fault conditions caused by overload or other abnormal conditions when the target generator set is in isolated network operation, thereby improving the reliability and safety of the generator set, further, in order to enable the target generator set to meet the service electric load standard, the turbine speed is regulated according to the service electric load standard, and a corresponding speed signal is generated, if the speed fluctuation value corresponding to the speed signal is not in a preset speed fluctuation threshold interval, the condition that the turbine speed has larger fluctuation is indicated, the current service electric load is indirectly indicated, and in order to enable the turbine speed to meet the current service electric load demand, a corresponding speed supplementary difference instruction is generated according to the speed fluctuation difference of the turbine, the turbine speed is regulated according to the speed supplementary difference instruction, and each operation parameter of the target generator set in isolated network operation state is subjected to adaptive conversion according to the actual conditions, thereby reducing the influence on the service electric generator set in isolated network operation state caused by the line disconnection or the isolated network fault condition.
Drawings
Fig. 1 is a schematic flow chart of steps S101 to S106 in the isolated network operation method of the present application.
Fig. 2 is a schematic diagram of isolated network operation switching buttons respectively set on operation pictures of a steam turbine DEH system in the isolated network operation method of the application.
Fig. 3 is a schematic flow chart of steps S201 to S203 in the isolated network operation method of the present application.
Fig. 4 is a schematic flow chart of steps S301 to S302 in the isolated network operation method of the present application.
Fig. 5 is a schematic flow chart of step S401 in the isolated network operation method of the present application.
Fig. 6 is a schematic diagram of primary frequency modulation parameters in a isolated network operation method according to the present application.
Fig. 7 is a schematic flow chart of step S501 in the isolated network operation method of the present application.
Fig. 8 is a schematic flow chart of step S601 in the isolated network operation method of the present application.
Fig. 9 is a schematic flow chart of step S701 in the isolated network operation method of the present application.
Fig. 10 is a schematic block diagram of a isolated network operating system according to the present application.
Reference numerals illustrate:
1. a first acquisition module; 2. a control module; 3. a second acquisition module; 4. a first adjustment module; 5. a generating module; 6. and a second adjustment module.
Detailed Description
The application is described in further detail below with reference to fig. 1-10.
The embodiment of the application discloses a isolated network operation method, which is shown in fig. 1 and comprises the following steps:
s101, acquiring the corresponding running state of a target generator set;
s102, if the operation state is isolated network operation, the initial operation mode of the control target generator set is converted into a valve control operation mode;
s103, obtaining output parameters corresponding to the generator components in a valve control operation mode;
s104, if the output parameters do not accord with the plant electrical load standard, adjusting the rotating speed of the steam turbine according to the plant electrical load standard, and generating a corresponding rotating speed signal;
s105, if the rotation speed fluctuation value corresponding to the rotation speed signal is not in the preset rotation speed fluctuation threshold interval, generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval;
s106, generating a corresponding rotating speed compensation command according to the rotating speed fluctuation difference, and adjusting the rotating speed of the steam turbine according to the rotating speed compensation command.
In step S101, the target genset refers to a power generation device in a power plant. In general, the target genset includes: a turbine, a generator, a transformer, a control system, a fuel supply system, and a cooling system. The control system is used for detecting and controlling the running state of the generator set, and adjusting the running state according to requirements, and comprises an automatic adjusting system, a safety protection system, a fault diagnosis system and the like.
Secondly, the running state refers to the current running state of the target generator set. Specifically, it generally includes: in a normal operation state, power generation, namely, when the group is in normal operation, stably outputting power, and meeting the power supply requirement of a user; in the starting state, the generator set needs to be subjected to a plurality of series of preparation works such as heating, preheating and the like in the starting process and then can start formal rotation; in a shutdown state, when equipment overhaul or shutdown maintenance is required, the generator set enters the shutdown state; in a speed regulation state, when the load of the power grid changes, the generator set needs to regulate the speed so as to keep the output power stable; when the power grid load exceeds the rated load of the generator set, the generator set is in an overload state, and equipment damage or system breakdown can be caused; in a short-circuit state, when a power grid fails, such as a breaker trips, a generator set may enter the short-circuit state, and corresponding measures are needed to be taken in time to protect equipment.
In practical application, the state of the 110KV working spring line switch can be led to the steam turbine and the steam turbine DEH system and connected to the digital input module, so that the steam turbine or the steam turbine DEH system judges that the power grid of the power plant is in a grid connection or grid disconnection state with the external network.
Specifically, the steam turbine DEH system is a digital electronic control system and is used for monitoring and controlling the operation condition of the steam turbine, and the steam turbine DEH system can accurately adjust and control parameters such as the rotating speed, the pressure, the temperature and the like of the steam turbine by detecting the parameters, so as to ensure the stable operation and the performance optimization of the steam turbine.
Further, when the 110KV work spring line switch trips, the steam turbine DEH system can be used for judging whether a power plant power grid and an external network are in an off-grid state, if the power plant power grid and the external network are in the off-grid state, the current target generator set does not have the isolated network operation function, and special control system, protection devices, automatic switch and other devices can be added to ensure that after the power plant is separated, isolated network operation switching buttons respectively arranged on operation pictures of the steam turbine and the steam turbine DEH system are operated, as shown in fig. 2, the target generator set is put into isolated network operation, stable voltage and frequency of the target generator set are kept, and the target generator set is reconnected to the power grid when required.
The energy storage device (such as a battery or a super capacitor) is arranged at the output end of the generator, and the energy storage device provides power supply support, so that the target generator set can independently run, namely, put into isolated network operation; and installing parallel control equipment so that the target generator set can work in parallel with other power supplies in an island mode.
For example, by checking the frequency measurement device in the steam turbine DEH system, if the reading is 0, it is indicated that the grid link has been interrupted, if the frequency reading is not 0, checking the voltage measurement device of the steam turbine DEH system, if the reading is also 0, it means that the grid link has been interrupted, if the voltage frequencies are all normal, but the generator output power is 0, it is indicated that it is possible that the generator has stopped running.
In step S102, the target generator set is in the isolated network operation mode, the power supply system of the target generator set is not generally supplied with external power, but the power supply system of the target generator set is supplied with power by the internal generator set, so that the initial operation mode of the generator set in the isolated network operation is generally an automatic voltage regulation and automatic frequency modulation (AVR) operation mode or a digital controller (DGC) operation mode with higher automation degree.
The initial operation mode of the target generator set is converted from the AVG or DGC to the valve control operation mode, and better effects can be brought about in some cases. For example, when the sudden load changes such as heavy load or short circuit which may occur during the isolated network operation are met, the valve control operation mode can more accurately control the output power and frequency of the generator set, so that the stable state of the power system can be quickly adjusted.
And secondly, the target generator set needs to autonomously control parameters such as output voltage, frequency and the like so as to meet the requirements of connected load equipment, and the valve control operation mode can improve the stability and reliability of the generator set and ensure that the generator set can still work normally when in isolated network operation. The valve control mode can also help to adjust the power output of the target generator set so as to meet the energy requirement during isolated network operation. In addition, energy waste can be reduced, the efficiency of the generator set is improved, and the stability of the target generator set is improved.
And if the current target generator set is not in the isolated network operation state, continuously monitoring each operation parameter of the target generator set according to the turbine DEH system.
In step S103 to step S104, it may be determined whether the current target generator set meets the current factory electrical load standard by acquiring the output parameter corresponding to the generator component in the valve control operation mode. The factory electrical load standard refers to the electrical quantity demand provided by an electrical power supplier, namely the maximum electrical energy consumption required to be accepted by an industrial enterprise in the normal production process. Generally, factory charge standards are formulated and adjusted according to factors such as the generation scale, the equipment type and the production period of enterprises. Wherein, in the target generator set, the generator component refers to each component part forming the generator, and the corresponding output parameters comprise: output voltage, current, power, frequency, waveform, etc., which are important indicators of generator performance and application range, and which are parameters of interest in operating and maintaining the generator.
For example, in order to accurately judge whether the target generator set meets the current power load standard of the plant, parameters such as voltage, current, frequency, power factor and the like of the generator set, namely output parameters, can be monitored in real time, and data analysis and processing are performed to determine whether the actual output power of the target generator set meets the power demand of the plant.
Specifically, the following may be used: the output voltage and the current are monitored, and whether the target generator set meets the power load standard of the factory can be primarily determined by comparing the difference between the output voltage and the current of the generator set and the load demand; monitoring the output frequency, and determining whether the output frequency of the target generator set is kept at about 50Hz or 60Hz by monitoring the output frequency of the target generator set in real time, so as to judge whether the target generator set meets the power grid requirement; the power factor is monitored, and whether the target generator set can stably provide effective power can be judged by monitoring the power factor of the target generator set, so that the normal operation of the power system is ensured; finally, data analysis processing is carried out, and the state and performance of the generator set, including load change conditions, power output levels, system stability and the like, can be more accurately determined by carrying out data analysis and processing on the monitored parameters, such as voltage, current, frequency, power factor and the like.
Further, if the output parameters of the target generator set obtained through the analysis do not meet the power load standard of the plant, the rotating speed of the steam turbine is adjusted according to the power load standard of the plant so as to ensure the normal operation of the power system, and the corresponding rotating speed signal is generated so as to be convenient for acquiring the actual operation state of the steam turbine in the target generator set in real time.
In practice, the power output of the target generator set is related to its rotational speed and magnetic field excitation. When the power load of the plant increases, the frequency of the power grid can be reduced, and the output power of the generator set needs to be increased by increasing the rotating speed of the steam turbine so as to meet the power load demand of the plant and restore the frequency of the power grid to the normal level. In contrast, when the plant electrical load is reduced, the frequency of the power grid is increased, and the output power of the generator set needs to be reduced by reducing the rotation speed of the steam turbine, so that the problem of overhigh frequency is solved. For example, the turbine speed is adjusted according to the plant electrical load standard to control the turbine speed to about 3000r/min, and in this case, there is a differential adjustment of the speed, where the differential adjustment means that the system maintains a constant speed by measuring the speed difference between the drive shaft and the load shaft and adjusting the control valve or other control device accordingly.
And if the output parameters meet the power load standard of the plant, parameters such as voltage, current, frequency, power factor and the like of the target generator set are monitored.
In steps S105 to S106, a current turbine rotational speed fluctuation value, which reflects a fluctuation width of the current turbine rotation, may be obtained by analyzing the rotational speed signal. Specifically, the rotational speed data of the steam turbine can be collected, the difference between adjacent rotational speed measurement values is calculated, the average value and the standard deviation of the difference values are calculated, if the standard deviation is large, that is, the rotational speed fluctuation value is not in a preset rotational speed fluctuation threshold value interval, the fact that large fluctuation exists is indicated, and the preset rotational speed fluctuation threshold value interval is the preset standard rotational speed fluctuation difference interval of the steam turbine.
The steam turbine has larger fluctuation, and meanwhile, the steam turbine also shows that the plant electric load also has larger fluctuation. This is because there is a certain relationship between the rotational speed of the turbine and the plant electrical load, and when the plant electrical load changes, the turbine will adjust the rotational speed to meet the electrical demand, and if the plant electrical load changes very much or very frequently, it may cause the fluctuation of the rotational speed of the turbine to increase.
And secondly, in order to timely adjust the rotating speed of the steam turbine to meet the current plant electric load demand, generating a corresponding rotating speed fluctuation difference according to the rotating speed fluctuation value of the current steam turbine and a corresponding preset rotating speed fluctuation threshold interval, generating a corresponding rotating speed compensation instruction according to the rotating speed fluctuation difference, and adjusting the rotating speed of the steam turbine according to the generated rotating speed compensation instruction.
Specifically, a rotational speed difference compensation instruction is generated according to the difference between the actual rotational speed fluctuation value of the turbine and the preset rotational speed fluctuation threshold value interval, the rotational speed difference compensation instruction is sent to a control system of the turbine to execute corresponding adjustment operation, the output power of the turbine can be adjusted to meet the power load demand of the plant by changing the opening degree of a valve in the control system, meanwhile, the operation state of the turbine is monitored, and the rotational speed difference compensation instruction is continuously adjusted according to the requirement to ensure that the turbine runs in the preset rotational speed fluctuation threshold value interval.
In the embodiment, if two turbines are switched into isolated network operation, a crew can disconnect a generator outlet breaker switch according to actual conditions, switch into rotation speed control or stop for switching off, and the unit in isolated network operation carries the plant power load of the section at the moment and carries another plant power load through a 110KV bus.
Specifically, in order to ensure stable power supply in the isolated grid, when two turbines turn into isolated grid operation, more power support is possibly needed, a breaker switch at the outlet of a generator is adjusted, the units are turned into rotation speed control or shut down for switching off, the load on the power grid can be reduced, the power grid is more stable, and meanwhile, through a 110KV bus, the two units can also carry another section of power load for plants to provide more power support so as to ensure the operation and stability of the power grid.
And if the rotation speed fluctuation value corresponding to the rotation speed signal of the target generator set is in the preset rotation speed fluctuation threshold value interval, continuously acquiring and detecting the rotation speed signal of the target generator set.
According to the isolated network operation method provided by the embodiment, if the operation state of the target generator set is isolated network operation, the initial operation mode of the target generator set is controlled to be changed into a valve control operation mode, the valve control operation mode can reduce the occurrence of the generator set fault condition caused by overload or other abnormal conditions when the target generator set is in isolated network operation, so that the reliability and safety of the generator set are improved, further, in order to enable the target generator set to meet the plant electric load standard, the turbine speed is regulated according to the plant electric load standard, a corresponding rotating speed signal is generated, if the rotating speed fluctuation value corresponding to the rotating speed signal is not in a preset rotating speed fluctuation threshold interval, the condition that the turbine speed has larger fluctuation is indicated, the current plant electric load is indirectly indicated, in order to enable the turbine speed to meet the current plant electric load requirement in time, a corresponding rotating speed difference instruction is generated according to the rotating speed fluctuation difference instruction, the rotating speed is regulated according to the rotating speed difference instruction, and the turbine power is subjected to adaptive conversion aiming at the operating mode of the target generator set in the isolated network operation state, and in combination with the actual condition, so that the condition that the line fault condition of the turbine generator set is controlled, and the line is out of the line fault condition is reduced, and the fault condition of the turbine generator set is controlled.
In one implementation manner of this embodiment, as shown in fig. 3, the operation state includes an output parameter corresponding to the target generator set, and after step S101, that is, after the operation state corresponding to the target generator set is acquired, the method further includes the following steps:
s201, judging whether the output parameter is in a preset output parameter threshold value interval or not;
s202, if the output parameter is in a preset output parameter threshold interval, judging whether a isolated network operation input button corresponding to a target generator set is in an input state or not;
s203, if the isolated network operation input button corresponding to the target generator set is in the input state, judging that the operation state corresponding to the target generator set is isolated network operation.
In step S201, the turbine DEH system may detect the output parameter corresponding to the target generator set to determine whether the target generator set is in a grid-connected or grid-disconnected state. The steam turbine DEH system is a distributed electronic control system, and is used for controlling and monitoring a steam turbine, and the system can monitor output parameters of a target generator set, such as steam flow or control valve opening, and then compare the output parameters with a preset output parameter threshold interval to determine the running state of the target generator set.
The preset output parameter threshold interval is set according to the actual application scene of the current power plant and the performance characteristics and stability requirements of the target generator set and the power system. Generally, the preset output parameter threshold interval refers to a parameter index corresponding to each output parameter of the generator set when the generator set is in normal operation. For example, for the output voltage and frequency of the target generator set, the corresponding preset output parameter threshold interval should be within the standard range of the power system, and factors such as the load change condition of the system, the steady state and transient response of the power system and the like are considered.
In step S202 to step S203, if the output parameter is within the preset output parameter threshold interval, it is determined that the current target generator set is in a network disconnection state, and in order to further determine whether the target generator set is in a isolated network operation, it is determined whether an isolated network operation input button corresponding to the target generator set is in an input state.
The isolated grid operation input button is a switching device and is used for connecting a target generator set to an isolated grid and starting the set to generate electricity. Specifically, when the isolated grid operation input button is in the input state, it may be determined that the current target generator set is already in the isolated grid operation state, and the target generator set is already connected to the isolated grid and is operating, so as to provide power for the grid, at this time, other generator sets in the isolated grid may already stop operating or not be connected to the grid, but still need to meet a certain load demand. Therefore, in this case, it is necessary to ensure stable operation of the target generator set and quality and reliability of output power to meet the demands of the power grid.
According to the isolated network operation method provided by the embodiment, whether the output parameter is in the preset output parameter threshold interval is judged according to the analysis of the output parameter corresponding to the target generator set, the accuracy of judging that the target generator set is in the isolated network state can be improved, further, whether the isolated network operation input button corresponding to the current target generator set is in the input state is judged, and if the isolated network operation input button is in the input state, the target generator set is judged to be in the isolated network operation at the moment, so that the accuracy of judging that the target generator set is in the isolated network operation state is improved, and corresponding measures can be timely taken to ensure the operation safety and stability of the generator set.
In one implementation manner of the present embodiment, as shown in fig. 4, step S102, that is, if the operation state is the isolated network operation, the initial operation mode of the control target generator set is converted into the valve control operation mode includes the following steps:
s301, if the operation state is isolated network operation, acquiring an initial operation mode corresponding to a target generator set, wherein the initial operation mode comprises main steam pressure control or power control and primary pumping pressure control or secondary pumping pressure control;
s302, controlling the target generator set to be converted into a valve control operation mode from main steam pressure control or power control, and one-extraction or two-extraction pressure control according to the steam turbine DEH system.
In step S301, if an initial operation mode of the target generator set before the isolated network operation needs to be acquired, the initial operation mode may be obtained by querying a history record or parameter setting of the steam turbine DEH system.
The main steam pressure control or the work control is one of control systems used for controlling the main steam pressure of a boiler or the output power of a generator in a power plant. Specifically, the main steam pressure control system adjusts the main steam valve opening by monitoring the boiler steam flow and pressure to maintain the proper main steam pressure.
Secondly, the primary pumping pressure control or the secondary pumping pressure control is one of control systems for controlling the air inflow of a turbine in a power plant, in a conventional turbine, the air inflow of the turbine can be realized through multi-stage pumping, and the primary pumping pressure control or the secondary pumping pressure control refers to controlling the outlet pressure of a primary or a secondary pump, so that the air inflow of the turbine is adjusted.
Specifically, the steam turbine DEH system generally records control parameters and operation states of each generator set, including information such as main steam pressure, output power, pumping control, and the like, and can determine an initial operation mode of the target generator set before isolated network operation by querying the history records, specifically including parameter settings in aspects such as main steam pressure control or power control, primary pumping or secondary pumping pressure control, and the like.
In step S302, the valve control operation mode may more precisely control the output power and the rotation speed of the generator set, so as to make the generator set more stable. In the isolated network operation mode, the generator set needs to operate more stably due to lack of external support so as to ensure the stability of the power grid.
The turbine DEH system adopts a digital technology to control the generator set, can realize higher-precision parameter control and adjustment, has multiple control modes and strategies, and can adjust operation parameters in real time according to different load conditions and external changes, so that the target generator set can be better adapted to various operation environments. In addition, the steam turbine DEH system also has self-diagnosis and fault detection functions, and can automatically alarm and take corresponding measures for repairing when faults or abnormal conditions occur. Therefore, the control target generator set using the steam turbine DEH system has higher precision control and more flexible adaptability than other methods.
Specifically, the steam turbine DEH system first monitors the operation mode of the target generator set, including the main steam pressure control or the work control, the first pumping or the second pumping, so as to determine which control mode conversion is required, and then the steam turbine DEH system automatically converts the control mode of the target generator set from the main steam pressure control or the work control, the first pumping or the second pumping into the valve control mode. In the valve control mode, the turbine DEH system monitors and adjusts the output power and speed of the genset to meet load demands and ensure stable operation.
Further, the steam turbine DEH system can switch the generator set by controlling parameters such as the opening of a main steam valve of the boiler, exciting current of the generator and the like. In the process, the DEH system can select the optimal control strategy and parameter setting according to the load condition of the target generator set and the real-time power grid condition. The turbine DEH system can continuously monitor and adjust the operating parameters of the generator set during the operation phase, including main steam pressure, generator output power, rotation speed, exciting current and the like. By controlling and adjusting these parameters, stable operation of the target generator set in the valve control mode can be ensured.
According to the isolated network operation method provided by the embodiment, the stability of the target generator set is higher by the valve control operation mode, the load fluctuation of the target generator set is reduced, meanwhile, the control conversion is carried out through the steam turbine DEH system, the remote monitoring and fault diagnosis of the target generator set can be realized, and the reliability and safety of equipment are improved.
In one implementation manner of this embodiment, as shown in fig. 5, in step S104, if the output voltage current value does not meet the plant electrical load standard, the turbine speed is adjusted according to the plant electrical load standard, and the corresponding speed signal is generated, and then the method further includes the following steps:
S401, guiding the rotating speed signal to a servo board through a primary frequency modulation module to form a hardware primary frequency modulation loop.
In step S401, a suitable primary frequency modulation module is selected, that is, the module may extract the rotation speed signal of the target generator set from the signal source (e.g. generator), and perform certain signal processing and adjustment, as shown in fig. 6, to adapt to the input requirement and control range of the servo board. And then the rotating speed signal is connected to the primary frequency modulation module, and in the isolated network operation mode, the generator set needs to operate more stably to ensure the stability of the power grid, so that the accuracy of the rotating speed signal needs to be ensured.
And secondly, connecting the output of the primary frequency modulation module to a servo plate to realize the control of mechanical motion. In the isolated network mode of operation, the servo system needs to respond to load changes and external disturbances more flexibly and efficiently to ensure that the genset is always in an optimal operating state. After the hardware primary frequency modulation loop is built, some parameter adjustment and optimization are needed to ensure the stability and accuracy of the rotating speed signal and realize the accurate control of the mechanical movement.
In practical application, the hardware primary frequency modulation loop can control the rotating speed signal more accurately and stably so as to meet the requirements of the isolated network operation on the stability and the response speed of the generator set. And secondly, the generator set can respond to load change and external interference more efficiently through the hardware primary frequency modulation loop, and a stable running state is maintained.
According to the isolated network operation method provided by the embodiment, the primary frequency modulation module introduces the rotating speed signal into the servo board, so that the adaptability adjustment of the rotating speed of the generator set can be realized, meanwhile, in the hardware primary frequency modulation loop, the control signal is directly transmitted to the servo board without software processing, so that the problems of software faults, calculation errors and the like can be reduced, and the stability and reliability of a control system are improved.
In one implementation manner of this embodiment, as shown in fig. 7, in step S401, the rotation speed signal is led to the servo board through the primary frequency modulation module, and after forming the hardware primary frequency modulation loop, the method further includes the following steps:
s501, debugging hardware parameters of the FM165 module according to response requirements corresponding to the hardware primary frequency modulation loop.
In step S501, a primary frequency modulation module FM165 dedicated to the steam turbine DEH system is used to directly guide the rotation speed signal to the servo board through the FM165 module, so as to meet the requirement of quick response of the hardware loop. The primary frequency modulation function is changed into a full-range function, and the primary frequency modulation rotating speed feedback is acted in a speed increasing stage or during the switching-on period of the oil switch.
The FM165 module is adopted, so that the generator set can be controlled rapidly and accurately, and the stability and efficiency of the system are improved. Meanwhile, the high-precision, low-noise and quick-response characteristics of the module provide powerful support for quick response of a hardware loop.
In one implementation manner of this embodiment, as shown in fig. 8, in step S401, the rotation speed signal is led to the servo board through the primary frequency modulation module, and after forming the hardware primary frequency modulation loop, the method further includes the following steps:
s601, setting a primary frequency modulation dead zone corresponding to a hardware primary frequency modulation loop to be +/-2 r/min, and not limiting amplitude.
In step S601, the primary frequency modulation dead zone refers to a region where the output signal is kept unchanged during the frequency modulation control, and if the rotation speed deviates from the target value only within a certain range, the output signal is kept unchanged, thereby reducing system oscillation and noise caused by frequent frequency modulation control.
Specifically, with this arrangement, the primary frequency modulation circuit will start to control when the rotational speed deviates from the target value ±2r/min, and when the rotational speed is restored to the vicinity of the target value, the output signal is restored to the original state, so that the stability and accuracy of the rotational speed of the target generator set can be ensured. In addition, as no amplitude limitation is arranged, the system can freely correspond to load change and external interference factors, and the system can be operated more flexibly and efficiently. It should be noted that, in practical application, parameter adjustment and optimization are also required according to the specific situation of the current target generator set, so as to ensure stability and control precision of the primary frequency modulation loop.
And secondly, if the current power load of the plant changes greatly, the rotating speed of the steam turbine also fluctuates greatly, and when the primary frequency modulation cannot stabilize the rotating speed near the standard rotating speed in time, an operator can input secondary frequency modulation, and the secondary frequency modulation calculates through PID according to the rotating speed difference and controls valve position output, so that the rotating speed adjustment is realized.
In the secondary frequency modulation loop, the PID controller calculates a control signal according to the rotation speed difference and outputs the control signal to the servo motor to drive the mechanical motion, wherein the setting of three parameters of P (proportion), I (integral) and D (derivative) is very important, and the response speed, stability, anti-interference capability and the like of the PID controller are determined. In the scheme, the control parameters corresponding to the PID comprise a target rotating speed, a rising speed, a given rotating speed and an actual rotating speed corresponding to the target generator set.
Specifically, the secondary frequency modulation module may be performed according to the following steps: collecting a rotating speed signal, collecting the rotating speed signal of a target generator set through a sensor or other modes, and sending the rotating speed signal to a secondary frequency modulation module; calculating a rotating speed deviation, and comparing the target rotating speed value with the current rotating speed value to obtain the rotating speed deviation; the PID calculates the control signal, calculates the corresponding control signal according to the rotating speed deviation through PID algorithm, outputs the control signal to the servo motor, realizes the control of mechanical motion, and updates the PID parameter regularly.
According to the isolated network operation method provided by the embodiment, the primary frequency modulation dead zone is set to be smaller + -2 r/min, so that the fluctuation range of a control signal can be reduced, the oscillation range of a system is effectively reduced, and the stability and the control precision of the system are improved.
In one implementation manner of this embodiment, as shown in fig. 9, in step S102, if the operation state is the isolated network operation, the method further includes the following steps after the initial operation mode of the control target generator set is converted into the valve control operation mode:
s701, if an oil switch corresponding to the target generator set is in a brake separating period, starting an overspeed limiting function of the generator set.
In step S701, in general, the rotational speed of the generator set may be very high due to lack of supply of lubricating oil, resulting in serious problems such as damage to mechanical parts, increase in noise, and the like. In order to reduce the occurrence of the above, the overspeed limiting function may be used to control the maximum rotational speed of the target genset, ensuring that it operates within a safe range.
Specifically, the rotation speed sensor monitors the rotation speed signal of the target generator set, sends the rotation speed signal into the controller for processing, monitors whether the state of the oil switch is a brake-separating state, if so, starts an overspeed limiting function, sets a proper upper limit of rotation speed according to the actual condition of the target generator set so as to reduce the mechanical damage or noise problem caused by overhigh rotation speed, and when the rotation speed of the target generator set is monitored to exceed the set upper limit, the controller sends a corresponding control signal to the speed regulator of the target generator set so as to control the rotation speed to be reduced.
For example, by modifying the OPC function, the 103% overspeed limiting function is disabled during the opening of the oil switch to reduce the occurrence of grid frequency ripple conditions. OPC is a communication protocol used to implement data exchange and sharing between different devices and systems.
According to the isolated network operation method, equipment damage and faults of the target generator set caused by too high rotating speed can be reduced, and accordingly the service life of the equipment is prolonged.
The embodiment of the application discloses a isolated network operation system, as shown in fig. 10, comprising:
the first acquisition module 1 is used for acquiring the corresponding running state of the target generator set;
the control module 2 is used for controlling the initial operation mode of the target generator set to be converted into a valve control operation mode if the operation state is isolated network operation;
the second acquisition module 3 is used for acquiring output parameters corresponding to the generator component in the valve control operation mode;
the first adjusting module 4 is used for adjusting the rotating speed of the steam turbine according to the plant electric load standard and generating a corresponding rotating speed signal if the output parameter does not accord with the plant electric load standard;
the generation module 5 is used for generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval if the rotation speed fluctuation value corresponding to the rotation speed signal is not in the preset rotation speed fluctuation threshold interval;
The second adjusting module 6 is configured to generate a corresponding rotational speed compensation command according to the rotational speed fluctuation difference, and adjust the rotational speed of the steam turbine according to the rotational speed compensation command.
In the isolated network operation system provided by the embodiment, if the operation state of the target generator set is isolated network operation, the initial operation mode of the target generator set is controlled to be converted into the valve control operation mode by the control module 2, the valve control operation mode can reduce the occurrence of the generator set fault condition caused by overload or other abnormal conditions when the target generator set is in isolated network operation, thereby improving the reliability and safety of the generator set, in order to further enable the target generator set to meet the plant electric load standard, the turbine speed is regulated by the first regulation module 4 according to the plant electric load standard, and a corresponding speed signal is generated, if the corresponding speed fluctuation value of the speed signal is not in the preset speed fluctuation threshold interval, the fact that the speed of the turbine is greatly fluctuated is indicated, and in order to timely enable the speed of the turbine set to meet the current plant electric load demand, the corresponding speed fluctuation difference is generated according to the generation module 5, in order to further enable the second regulation module 6 to generate a corresponding speed difference command according to the speed difference command, in order to immediately regulate the speed, and in order to enable the turbine set to be in the isolated network operation state, the actual state is combined with the isolated network operation mode of the target generator set to be converted, and the isolated network operation mode is reduced, and the fault condition of the turbine generator set is combined, and the isolated network operation mode is opened, so that the fault condition of the generator set is actually can be regulated.
It should be noted that, the isolated network operation system provided by the embodiment of the present application further includes each module and/or corresponding sub-module corresponding to the logic function or logic step of any one of the isolated network operation methods, so that the same effects as each logic function or logic step are achieved, and detailed descriptions thereof are omitted herein.
The embodiment of the application also discloses a terminal device which comprises a memory, a processor and computer instructions stored in the memory and capable of running on the processor, wherein when the processor executes the computer instructions, any one isolated network running method in the embodiment is adopted.
The terminal device may be a computer device such as a desktop computer, a notebook computer, or a cloud server, and the terminal device includes, but is not limited to, a processor and a memory, for example, the terminal device may further include an input/output device, a network access device, a bus, and the like.
The processor may be a Central Processing Unit (CPU), or of course, according to actual use, other general purpose processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), ready-made programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., and the general purpose processor may be a microprocessor or any conventional processor, etc., which is not limited in this respect.
The memory may be an internal storage unit of the terminal device, for example, a hard disk or a memory of the terminal device, or an external storage device of the terminal device, for example, a plug-in hard disk, a Smart Memory Card (SMC), a secure digital card (SD), or a flash memory card (FC) provided on the terminal device, or the like, and may be a combination of the internal storage unit of the terminal device and the external storage device, where the memory is used to store computer instructions and other instructions and data required by the terminal device, and the memory may be used to temporarily store data that has been output or is to be output, which is not limited by the present application.
Any one of the isolated network operation methods in the above embodiments is stored in the memory of the terminal device through the present terminal device, and is loaded and executed on the processor of the terminal device, so that the use is convenient.
The embodiment of the application also discloses a computer readable storage medium, and the computer readable storage medium stores computer instructions, wherein when the computer instructions are executed by a processor, any one of the isolated network operation methods in the embodiment is adopted.
The computer instructions may be stored in a computer readable medium, where the computer instructions include computer instruction codes, where the computer instruction codes may be in a source code form, an object code form, an executable file form, or some middleware form, etc., and the computer readable medium includes any entity or device capable of carrying the computer instruction codes, a recording medium, a usb disk, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunication signal, a software distribution medium, etc., where the computer readable medium includes but is not limited to the above components.
Any one of the isolated network operation methods in the above embodiments is stored in the computer readable storage medium through the present computer readable storage medium, and is loaded and executed on a processor, so as to facilitate storage and application of the method.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The isolated network operation method is characterized by comprising the following steps of:
acquiring the corresponding running state of the target generator set;
if the operation state is isolated network operation, controlling the initial operation mode of the target generator set to be converted into a valve control operation mode;
obtaining output parameters corresponding to the generator component in the valve control operation mode;
if the output parameters do not accord with the plant electrical load standard, regulating the rotating speed of the steam turbine according to the plant electrical load standard, and generating a corresponding rotating speed signal;
if the rotation speed fluctuation value corresponding to the rotation speed signal is not in a preset rotation speed fluctuation threshold interval, generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval;
And generating a corresponding rotating speed compensating difference instruction according to the rotating speed fluctuation difference, and adjusting the rotating speed of the steam turbine according to the rotating speed compensating difference instruction.
2. The isolated network operation method according to claim 1, wherein the operation state includes an output parameter corresponding to the target generator set, and further comprising the following steps after the operation state corresponding to the target generator set is obtained:
judging whether the output parameter is in a preset output parameter threshold interval or not;
if the output parameter is in a preset output parameter threshold interval, judging whether a isolated network operation input button corresponding to the target generator set is in an input state or not;
and if the isolated network operation input button corresponding to the target generator set is in the input state, judging that the operation state corresponding to the target generator set is the isolated network operation.
3. The isolated network operation method according to claim 1, wherein if the operation state is isolated network operation, the step of controlling the initial operation mode of the target generator set to be converted into the valve control operation mode comprises the following steps:
if the running state is the isolated network running, acquiring the initial running mode corresponding to the target generator set, wherein the initial running mode comprises main steam pressure control or power control and primary pumping or secondary pumping pressure control;
And controlling the target generator set to be converted into a valve control operation mode from main steam pressure control or power control, and one-extraction or two-extraction pressure control according to the steam turbine DEH system.
4. The isolated network operation method according to claim 1, wherein if the output voltage current value does not meet a plant power load standard, adjusting the turbine speed according to the plant power load standard, and generating a corresponding speed signal, further comprising the steps of: and leading the rotating speed signal to a servo board through a primary frequency modulation module to form a hardware primary frequency modulation loop.
5. The isolated network operation method according to claim 4, wherein the primary frequency modulation module comprises an FM165 module, and the method further comprises the following steps after the primary frequency modulation module directs the rotation speed signal to a servo board to form a hardware primary frequency modulation loop: and debugging hardware parameters of the FM165 module according to response requirements corresponding to the hardware primary frequency modulation loop.
6. The isolated network operation method according to claim 4, wherein after the rotation speed signal is led to the servo board by the primary frequency modulation module to form a hardware primary frequency modulation loop, the method further comprises the following steps: and the primary frequency modulation dead zone corresponding to the hardware primary frequency modulation loop is set to be +/-2 r/min, and the primary frequency modulation dead zone is not limited.
7. The isolated network operation method according to claim 1, wherein after the initial operation mode of the target generator set is controlled to be converted into the valve control operation mode if the operation state is the isolated network operation, further comprising the steps of: and if the oil switch corresponding to the target generator set is in the brake separating period, starting an overspeed limiting function of the generator set.
8. A isolated network operation system, comprising:
the first acquisition module (1) is used for acquiring the corresponding running state of the target generator set;
the control module (2) is used for controlling the initial operation mode of the target generator set to be converted into a valve control operation mode if the operation state is isolated network operation;
the second acquisition module (3) is used for acquiring output parameters corresponding to the generator component in the valve control operation mode;
the first adjusting module (4) is used for adjusting the rotating speed of the steam turbine according to the plant power load standard and generating a corresponding rotating speed signal if the output parameter does not accord with the plant power load standard;
the generation module (5) is used for generating a corresponding rotation speed fluctuation difference according to the rotation speed fluctuation value and the preset rotation speed fluctuation threshold interval if the rotation speed fluctuation value corresponding to the rotation speed signal is not in the preset rotation speed fluctuation threshold interval;
And the second adjusting module (6) is used for generating a corresponding rotating speed compensating difference instruction according to the rotating speed fluctuation difference and adjusting the rotating speed of the steam turbine according to the rotating speed compensating difference instruction.
9. A terminal device comprising a memory and a processor, wherein the memory has stored therein computer instructions executable on the processor, and wherein the processor, when loaded and executing the computer instructions, employs a orphan operation method according to any one of claims 1 to 7.
10. A computer readable storage medium having stored therein computer instructions which, when loaded and executed by a processor, employ a isolated network operation method according to any one of claims 1 to 7.
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