CN112865176B - Isolated network switching control method, system, device and storage medium - Google Patents

Isolated network switching control method, system, device and storage medium Download PDF

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Publication number
CN112865176B
CN112865176B CN202110057953.1A CN202110057953A CN112865176B CN 112865176 B CN112865176 B CN 112865176B CN 202110057953 A CN202110057953 A CN 202110057953A CN 112865176 B CN112865176 B CN 112865176B
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unit
power
isolated network
value
current
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CN112865176A (en
Inventor
秦威
连能利
王智英
李晓峰
傅文明
陈小波
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Guoneng Shenfu Jinjiang Thermal Power Co ltd
CHN Energy Group Fujian Energy Co Ltd
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Fujian Jinjiang Cogeneration Co ltd
CHN Energy Group Fujian Energy Co Ltd
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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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The application discloses a control method for isolated network switching, which is used for solving the problem that a unit in an isolated network system cannot run stably due to the fact that balance between an electric load and a power supply load in the isolated network system cannot be guaranteed in the existing isolated network control method. The method comprises the following steps: determining the current running state of the unit according to the collected unit running parameters; when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold.

Description

Isolated network switching control method, system, device and storage medium
Technical Field
The application relates to the technical field of comprehensive utilization of energy, in particular to a method, a system, a device and a storage medium for controlling isolated network switching.
Background
The isolated network operation mainly refers to a special operation mode under a specific condition, namely the isolated network is separated from a large power grid and can maintain the continuous operation of the steam turbine generator unit in a small power grid in a power plant. When local power grid faults, extreme weather or geological disasters and manual operation errors occur, a power grid in an area which is in weak contact with a large power grid can be disconnected from a main grid, and the isolated grid operation condition is formed.
In the moment of large power grid failure, the impact on a steam turbine generator unit of a power plant is large, the large fluctuation of the unit frequency is easily caused, if the frequency fluctuation range is exceeded, the overspeed protection function (OPC) repeatedly acts to cause frequency and power oscillation, and because the steam turbine generator unit trips due to the arrangement of the boiler interlocking protection, the safety and stability operation of power plant equipment is very unfavorable, equipment such as a boiler dry pot is easily damaged, and the power loss of the whole power plant of the power plant can be possibly caused.
The cogeneration unit generally adopts a running mode of fixing power by heat, after a connecting line breaks down, the power balance is damaged, a rapid load shedding stage is started, the frequency fluctuates, and the balance of electric power and the balance of thermal power are considered when the cogeneration unit operates in an isolated network. In order to ensure normal operation of equipment, the cogeneration enterprises need to ensure balance of electricity and steam at the same time, and the electricity and the steam are coupled, so that difficulty is increased for controlling isolated network operation.
Therefore, at present, an isolated network operation control method capable of reducing the unbalance between the power utilization load and the power supply load in the isolated network system and realizing the stable operation of the unit in the isolated network system is urgently needed.
Disclosure of Invention
The embodiment of the application provides a control method for isolated network switching, which is used for solving the problem that a unit in an isolated network system cannot run stably due to the fact that the balance between an electric load and a power supply load in the isolated network system cannot be guaranteed in the existing isolated network control method.
The embodiment of the application further provides a isolated network switching control device, which is used for solving the problem that a unit in the isolated network system cannot stably run due to the fact that the balance between an electric load and a power supply load in the isolated network system cannot be guaranteed in the existing isolated network control method.
The embodiment of the application also provides a computer readable storage medium, which is used for solving the problem that a unit in the isolated network system cannot run stably due to the fact that the balance between the power utilization load and the power supply load in the isolated network system cannot be guaranteed in the existing isolated network control method.
The embodiment of the application adopts the following technical scheme:
a method for controlling isolated network switching comprises the following steps:
determining the current running state of the unit according to the collected unit running parameters;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
Further, the unit operation parameters include: position signals of an outlet grid-connected switch of the unit; three-phase voltage of a unit outlet grid-connected switch; and (5) the rotating speed and acceleration value of the unit.
Further, according to the collected unit operation parameters, determining the current operation state of the unit specifically includes: acquiring a preset parameter threshold value aiming at the unit operation parameter; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2And when the three-phase voltage of the unit outlet grid-connected switch is greater than 10.5kV +/-0.5 kV and the position signal of the unit outlet grid-connected switch is in the closed position, determining that the current running state of the unit is in the isolated grid state.
Further, the current generated power of the unit is monitored, and whether isolated network regulation and control are performed is judged according to the current generated power, and the method specifically comprises the following steps: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; and when the current generating power is larger than the second generating power value, determining to perform isolated grid regulation.
Further, when the current generated power is greater than the first generated power value and less than the second generated power value, the method further includes: and sending a load switching control instruction to the unit so that the unit closes a load switch aiming at the industrial park feeder line in response to the load switching control instruction.
Further, the system is switched from the power control loop to the rotating speed control loop, and the set is subjected to frequency modulation control by utilizing a preset rotating speed threshold, and the method specifically comprises the following steps: collecting the current rotating speed of the unit turbine; and performing frequency modulation control on the unit by utilizing a PID controller according to the current rotating speed and the rotating speed threshold value.
An isolated network handover control system comprising:
the operation state determining unit is used for determining the current operation state of the unit according to the collected unit operation parameters;
the power monitoring unit is used for monitoring the current generating power of the unit when the operation state determining unit determines that the current operation state of the unit is an isolated network state, and judging whether isolated network regulation is performed or not according to the current generating power;
and the isolated network regulating and controlling unit is used for switching the system from the power control loop to the rotating speed control loop when the judgment result of the power monitoring unit is yes, and performing frequency modulation control on the unit by utilizing a preset rotating speed threshold value.
An isolated network switching control device comprising:
a processor; and
a memory arranged to store computer executable instructions that, when executed, cause the processor to: determining the current operation state of the unit according to the acquired unit operation parameters; when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
A computer readable storage medium storing one or more programs that, when executed by an electronic device that includes a plurality of application programs, cause the electronic device to: determining the current running state of the unit according to the collected unit running parameters; when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
by adopting the isolated network switching control method provided by the embodiment of the application, the isolated network switching control system can utilize the data acquisition device preset on the unit to acquire the unit operation parameters and determine the current operation state of the unit according to the acquired unit operation parameters; when the current operation state of the unit is determined to be the isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation and control are needed to be carried out on the unit according to the current generated power; when the unit is judged to need to be subjected to isolated network regulation, the system can be switched from the power control loop to the rotating speed control loop, and the unit is subjected to frequency modulation control by utilizing a preset rotating speed threshold value, so that the unit turbine cannot overspeed to cause tripping in an isolated network state. By adopting the isolated network switching control method provided by the embodiment of the application, the control system can pre-judge whether the unit enters the isolated network state according to the isolated network operation judgment condition, further strive for the preprocessing time for the subsequent isolated network operation switching, and simultaneously utilize the preset rotating speed threshold value to carry out frequency modulation control on the unit, thereby effectively ensuring the stable control on the rotating speed of the unit device under the isolated network state, and avoiding the unit operation accident caused by the unstable operation of the unit under the isolated network state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flowchart of a specific implementation of an isolated network handover control method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a specific implementation of frequency modulation control of a unit in an isolated grid state based on PID according to an embodiment of the present application;
fig. 3 is a schematic diagram of a specific implementation flow of a control method for maintaining an electric-heat balance of a unit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a isolated network handover control system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a isolated network switching control device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The embodiment of the application provides a control method for isolated network switching, which is used for solving the problem that a unit in an isolated network system cannot run stably due to the fact that the balance between an electric load and a power supply load in the isolated network system cannot be guaranteed in the existing isolated network control method.
The execution main body of the coal-electricity integration enterprise production scheduling optimization method provided by the embodiment of the application can be, but is not limited to, at least one of a mobile phone, a tablet Computer, a Personal Computer (PC) and any terminal device capable of running an application program. Alternatively, the execution subject of the method can also be an existing enterprise management system, such as a lone network switching control system, and the like. For convenience of description, the following description will be made of an embodiment of the method, taking the execution subject of the method as an isolated network switching control system as an example. It is understood that the execution subject of the method is the isolated network switching control system, which is only an exemplary illustration and should not be understood as a limitation of the method.
The specific implementation flow chart of the method is shown in fig. 1, and mainly comprises the following steps:
step 11, determining the current operation state of the unit according to the acquired unit operation parameters;
in the embodiment of the present application, the unit operation parameters to be collected mainly include the following: the system comprises a position signal of an outlet grid-connected switch of the unit, three-phase voltage of the outlet grid-connected switch of the unit and a rotating speed acceleration value of the unit.
The unit operation parameters can be acquired by presetting a signal acquisition device at a specific position of the unit.
For example, a signal collector may collect a position signal of an outlet grid-connected switch of the unit, where the position signal of the outlet grid-connected switch of the unit includes: a closed state and an open state. If the on-position state signal is marked as 0 and the on-position state signal is marked as 1 in the logic truth table, the isolated grid switching control system can determine the state of the current unit outlet grid-connected switch according to the position signal acquired by the signal acquisition device.
For the speed and acceleration value of the unit, the speed and acceleration value of the unit can be acquired through a signal acquisition unit, and can also be directly acquired through a Digital Electric Hydraulic control system (DEH control system) of a steam turbine.
In addition, in the embodiment of the application, the three-phase voltage of the outlet grid-connected switch can be measured through a voltmeter arranged at the outlet grid-connected switch of the unit, and the measured value is uploaded to the isolated grid switching control system.
After the isolated network switching control system obtains the unit operation parameters, the isolated network switching control system can determine the current operation state of the unit by comparing the obtained unit operation parameters with preset parameter thresholds.
Specifically, in the embodiment of the present application, the isolated network switching control system may determine the current operation state of the unit according to the following method:
acquiring a preset parameter threshold value aiming at the unit operation parameter; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2When the three-phase voltage of the unit outlet grid-connected switch is greater than 10.5kV +/-0.5 kV and the position signal of the unit outlet grid-connected switch is in the closed position, determining that the current running state of the unit is in an isolated network state; otherwise, the current operation state of the unit can be determined to be a grid-connected state.
And when the current operation state of the unit is determined to be the isolated grid state by executing the step 11, executing the step 12, and when the current operation state of the unit is determined to be the grid-connected state, continuously acquiring the operation parameters of the unit, and monitoring the operation state of the unit based on the acquired operation parameters of the unit.
Step 12, when the current operation state of the unit is determined to be the isolated network state by executing the step 11, monitoring the current generated power of the unit, and judging whether to perform isolated network regulation according to the current generated power; if yes, continuing to execute the step 13; if the judgment result is no, executing step 12 in a circulating way;
in the embodiment of the application, the regulation and control of the unit in the isolated grid state are mainly the regulation and control of the rotating speed of a turbine of the unit, so that tripping caused by overspeed of the turbine in the isolated grid state is avoided. The rotating speed of the steam turbine directly determines the generating power of the unit, so that whether the unit needs to be subjected to isolated network regulation and control or not can be judged according to the current generating power by monitoring the current generating power of the unit in the embodiment of the application.
Specifically, the isolated network regulation and control judgment can be performed according to the following method in the embodiment of the present application:
acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; and when the current generating power is larger than the second generating power value, determining to perform isolated network regulation.
In the embodiment of the application, a first power generation power value P1 can be set according to the power plant power utilization operating power, a second power generation power value P2 can be set according to the sum of the power plant power utilization operating power and the industrial park feeder power, and the collected current power generation power value of the unit is recorded as P.
When P2> P > P1, namely the current generating power of the unit can meet the power utilization operating power of the power plant and cannot meet the power utilization operating power of the power plant and the industrial park feeder power, at the moment, if the unit continues to keep the industrial park feeder load, the rotating speed of the unit needs to be increased to increase the generating power P, and finally the purpose that P is greater than P2 can be achieved, and under the condition, the unit is tripped due to overspeed caused by forcibly increasing the rotating speed of the unit. In order to ensure normal and stable operation of the unit, in the embodiment of the present application, when P2> P1, the isolated network switching control system may send to the unit: the method comprises the following steps of 'cutting an external load instruction', so that a unit responds to the instruction and closes a load switch aiming at an industrial park feeder line, and the purpose of cutting the external industrial park feeder line is achieved. After the external load is cut off, because the generating power P of the unit is greater than P1, the unit only needs to normally operate at the moment, the power consumption of a power plant can be ensured, the rotating speed of the unit is not required to be increased, and the risk of overspeed tripping of the unit is avoided.
In one embodiment, after determining that the current generated power is greater than the first generated power value and less than the second generated power value by performing step 12, the method provided by the embodiment of the present application may include: and sending a load switching control instruction to the unit so that the unit closes a load switch aiming at the industrial park feeder line in response to the load switching control instruction.
And when P is greater than P2, the generated power which can be reached according to the current unit rotating speed is shown, that is, the operating power of the power plant and the feeder power of the industrial park can be satisfied, at this time, the unit does not need to cut off external load, and the generated load of the unit is adjusted through the primary frequency modulation function of the DEH system, so that the unit is balanced in an isolated network state, specifically, see the following step 13.
And step 13, when the isolated network regulation is determined to be needed by executing the step 12, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
In this embodiment of the application, when it is determined that isolated network regulation and control are required by performing step 12, the isolated network switching control system may first switch the basic control of the DEH system of the unit from the power control loop to the rotation speed control loop. Meanwhile, a frequency PID closed loop adjusting circuit and a primary frequency modulation circuit of the DEH system are utilized to carry out primary frequency modulation debugging on the DEH control system of the unit.
In an implementation manner, a flow of tuning a primary frequency provided in an embodiment of the present application is shown in fig. 2. And performing primary frequency modulation by adopting a PID controller, assuming that the preset rated rotating speed is 3000RPM, and the feedback variable is the current actual rotating speed of a turbine of the unit, calculating a target modulation output value through the actual rotating speed value and the rated rotating speed value of the turbine, performing primary frequency modulation control through the PID controller, respectively determining a valve instruction and a flow instruction, and feeding back the valve instruction and the flow instruction to the unit.
In the embodiment of the application, the given power of the unit can be adjusted through primary frequency modulation, so that the given power is gradually close to the load on the power grid (power utilization of a power plant and a feeder of an industrial park) in the current isolated grid state, and the effect of stabilizing the cycle frequency of the power grid is achieved.
In addition, it should be noted here that when the unit operates in the parallel external power grid, the unit generally operates in a mode of heating and power fixing, and when the unit operates in the isolated power grid state, the unit must be switched to operate in a mode of heating and power fixing to preferentially ensure the rapid regulation and balance of the electrical load.
For example, assuming that according to actual operation conditions on site, when the main steam pressure on the boiler side exceeds 5% of rated parameters of a unit, the steam exhaust valve of the boiler is opened in an interlocking manner; when the minimum steam inlet amount of the backpressure machine is lower than 30% of the rated steam inlet amount of the backpressure machine, the backpressure machine is interlocked to open the air exhaust steam valve, and the opening degree is automatically adjusted according to actual conditions, so that the electric heat balance of the unit is ensured, as shown in fig. 3.
By adopting the isolated network switching control method provided by the embodiment of the application, the isolated network switching control system can utilize the data acquisition device preset on the unit to acquire the unit operation parameters and determine the current operation state of the unit according to the acquired unit operation parameters; when the current operation state of the unit is determined to be the isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation and control are needed to be carried out on the unit according to the current generated power; when the isolated network regulation and control of the unit are needed, the system can be switched from the power control loop to the rotating speed control loop, and the unit is subjected to frequency modulation control by utilizing a preset rotating speed threshold value, so that the unit turbine cannot overspeed to cause tripping in an isolated network state. By adopting the isolated network switching control method provided by the embodiment of the application, the control system can prejudge whether the unit enters the isolated network state or not according to the isolated network operation judgment condition, so as to further strive for the pretreatment time for the subsequent isolated network operation switching, and simultaneously utilize the preset rotating speed threshold value to carry out frequency modulation control on the unit, thereby effectively ensuring the stable control on the rotating speed of the unit device under the isolated network state, and avoiding the unit operation accident caused by the fact that the unit can not stably operate under the isolated network state.
Fig. 4 is a block diagram of an isolated network switching control system according to an exemplary embodiment, which is used to solve a problem that a unit in an isolated network system cannot run smoothly due to an inability of guaranteeing balance between an electric load and a power supply load in the isolated network system in an existing isolated network control method. Referring to fig. 4, the system operation state determination unit 41, the power monitoring unit 42, and the isolated network regulation unit 43.
The operation state determining unit 41 is configured to determine a current operation state of the unit according to the collected unit operation parameters;
a power monitoring unit 42, configured to monitor the current generated power of the unit when the operation state determining unit 41 determines that the current operation state of the unit is an isolated grid state, and determine whether to perform isolated grid regulation according to the current generated power;
and the isolated network regulating and controlling unit 43 is configured to, when the power monitoring unit 42 determines that the system is a normal system, switch the system from the power control loop to the rotation speed control loop, and perform frequency modulation control on the unit by using a preset rotation speed threshold.
In one embodiment, the unit operating parameters include: position signals of an outlet grid-connected switch of the unit; three-phase voltage of a unit outlet grid-connected switch; and (5) the rotating speed and acceleration value of the unit.
In an embodiment, the operation state determining unit 41 is specifically configured to: acquiring a preset parameter threshold value aiming at the unit operation parameter; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2The three-phase voltage of the unit outlet grid-connected switch is more than 10.5kV +/-0.5 kV, and the unit outlet grid-connected switchAnd when the position signal is in a closed position, determining that the current running state of the unit is in an isolated network state.
In one embodiment, the power monitoring unit 42 is specifically configured to: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; and when the current generating power is larger than the second generating power value, determining to perform isolated network regulation.
In one embodiment, the apparatus further includes a control instruction sending unit configured to: and when the power monitoring unit determines that the current generating power is larger than the first generating power value and smaller than the second generating power value, sending a load switching control instruction to the unit, so that the unit responds to the load switching control instruction and closes a load switch aiming at the feeder line of the industrial park.
In an embodiment, the isolated network regulation and control unit 43 is specifically configured to: collecting the current rotating speed of the unit turbine; and performing frequency modulation control on the unit by utilizing a PID controller according to the current rotating speed and the rotating speed threshold value.
By adopting the isolated network switching control system provided by the embodiment of the application, the isolated network switching control system can utilize a data acquisition device preset on the unit to acquire unit operation parameters and determine the current operation state of the unit according to the acquired unit operation parameters; when the current operation state of the unit is determined to be the isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation and control are needed to be carried out on the unit according to the current generated power; when the unit is judged to need to be subjected to isolated network regulation, the system can be switched from the power control loop to the rotating speed control loop, and the unit is subjected to frequency modulation control by utilizing a preset rotating speed threshold value, so that the unit turbine cannot overspeed to cause tripping in an isolated network state. By adopting the isolated network switching control method provided by the embodiment of the application, the control system can pre-judge whether the unit enters the isolated network state according to the isolated network operation judgment condition, further strive for the preprocessing time for the subsequent isolated network operation switching, and simultaneously utilize the preset rotating speed threshold value to carry out frequency modulation control on the unit, thereby effectively ensuring the stable control on the rotating speed of the unit device under the isolated network state, and avoiding the unit operation accident caused by the unstable operation of the unit under the isolated network state.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. Referring to fig. 5, at a hardware level, the electronic device includes a processor, and optionally further includes an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory, such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, the network interface, and the memory may be connected to each other via an internal bus, which may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 5, but this does not indicate only one bus or one type of bus.
And the memory is used for storing programs. In particular, the program may include program code comprising computer operating instructions. The memory may include both memory and non-volatile storage and provides instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory into the memory and then runs the computer program to form the data synchronization device on the logic level. The processor is used for executing the program stored in the memory and is specifically used for executing the following operations:
determining the current operation state of the unit according to the acquired unit operation parameters;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold.
The method performed by the isolated network switching control electronic device according to the embodiment of fig. 5 of the present application may be applied to or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
Of course, besides the software implementation, the electronic device of the present application does not exclude other implementations, such as a logic device or a combination of software and hardware, and the like, that is, the execution subject of the following processing flow is not limited to each logic unit, and may also be hardware or a logic device.
Embodiments of the present application also provide a computer-readable storage medium storing one or more programs, where the one or more programs include instructions, which when executed by a portable electronic device including a plurality of application programs, enable the portable electronic device to perform the method of the embodiment shown in fig. 1, and are specifically configured to:
determining the current running state of the unit according to the collected unit running parameters;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (6)

1. A method for controlling isolated network switching is characterized by comprising the following steps:
determining the current running state of the unit according to the collected unit running parameters; specifically, a parameter threshold value preset aiming at the unit operation parameter is obtained; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2When the three-phase voltage of the unit outlet grid-connected switch is greater than 10.5kV +/-0.5 kV and the position signal of the unit outlet grid-connected switch is in the closed position, determining that the current running state of the unit is in an isolated network state; the unit operating parameters include: position signals of an outlet grid-connected switch of the unit; three-phase voltage of a unit outlet grid-connected switch; the rotational speed and acceleration value of the unit;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; the method specifically comprises the following steps: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; when the current generating power is larger than the second generating power value, determining to perform isolated network regulation; when the current generating power is larger than the first generating power value and smaller than the second generating power value, sending a load switching control instruction to the unit, so that the unit responds to the load switching control instruction and closes a load switch for the industrial park feeder;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
2. The isolated network switching control method according to claim 1, wherein a system is switched from a power control loop to a rotation speed control loop, and frequency modulation control is performed on a unit by using a preset rotation speed threshold, specifically comprising:
collecting the current rotating speed of the unit turbine;
and performing frequency modulation control on the unit by utilizing a PID controller according to the current rotating speed and the rotating speed threshold value.
3. An isolated network handover control system, comprising:
the operation state determining unit is used for determining the current operation state of the unit according to the collected unit operation parameters; specifically, a parameter threshold value preset aiming at the unit operation parameter is obtained; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2When the three-phase voltage of the unit outlet grid-connected switch is greater than 10.5kV +/-0.5 kV and the position signal of the unit outlet grid-connected switch is in the closed position, determining that the current running state of the unit is in an isolated network state; the unit operating parameters include: position signals of an outlet grid-connected switch of the unit; three-phase voltage of a unit outlet grid-connected switch; the rotational speed and acceleration value of the unit;
the power monitoring unit is used for monitoring the current generating power of the unit when the operation state determining unit determines that the current operation state of the unit is an isolated network state, and judging whether isolated network regulation is performed or not according to the current generating power; the method specifically comprises the following steps: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; when the current generating power is larger than the second generating power value, determining to perform isolated network regulation; when the current generating power is larger than the first generating power value and smaller than the second generating power value, sending a load switching control instruction to the unit, so that the unit responds to the load switching control instruction and closes a load switch for the industrial park feeder;
and the isolated network regulating and controlling unit is used for switching the system from the power control loop to the rotating speed control loop when the judgment result of the power monitoring unit is yes, and performing frequency modulation control on the unit by utilizing a preset rotating speed threshold value.
4. The isolated network switching control system according to claim 3, wherein the isolated network regulating and controlling unit is specifically configured to:
collecting the current rotating speed of the unit turbine;
and performing frequency modulation control on the unit by utilizing a PID controller according to the current rotating speed and the rotating speed threshold value.
5. An isolated network switching control device comprising:
a processor; and
a memory arranged to store computer executable instructions that, when executed, cause the processor to:
determining the current operation state of the unit according to the acquired unit operation parameters; specifically, a parameter threshold value preset aiming at the unit operation parameter is obtained; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2When the three-phase voltage of the unit outlet grid-connected switch is greater than 10.5kV +/-0.5 kV and the position signal of the unit outlet grid-connected switch is in the closed position, determining that the current running state of the unit is in an isolated network state; the unit operating parameters include: position signals of an outlet grid-connected switch of the unit; three-phase power of unit outlet grid-connected switchPressing; the rotational speed and acceleration value of the unit;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; the method specifically comprises the following steps: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; when the current generating power is larger than the second generating power value, determining to perform isolated network regulation; when the current generating power is larger than the first generating power value and smaller than the second generating power value, sending a load switching control instruction to the unit, so that the unit responds to the load switching control instruction and closes a load switch for the industrial park feeder;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
6. A computer-readable storage medium storing one or more programs that, when executed by an electronic device including a plurality of application programs, cause the electronic device to:
determining the current running state of the unit according to the collected unit running parameters; specifically, a parameter threshold value preset aiming at the unit operation parameter is obtained; wherein the parameter threshold value set for the speed and acceleration value of the unit is 250r/s2The parameter threshold value set for the three-phase voltage of the unit outlet grid-connected switch is 10.5kV +/-0.5 kV; when the collected rotating speed and acceleration value of the unit is more than 250r/s2The three-phase voltage of the unit outlet grid-connected switch is more than 10.5kV +/-0.5 kV, and the position of the unit outlet grid-connected switchWhen the signal is in a closed position, determining that the current running state of the unit is in an isolated network state; the unit operating parameters include: position signals of an outlet grid-connected switch of the unit; three-phase voltage of a unit outlet grid-connected switch; the rotational speed and acceleration value of the unit;
when the current operation state of the unit is in an isolated network state, monitoring the current generated power of the unit, and judging whether isolated network regulation is performed or not according to the current generated power; the method specifically comprises the following steps: acquiring a preset first power generation power value and a preset second power generation power value; wherein the first generating power value is used for representing the power utilization operation power of the power plant, and the second generating power value is used for representing the sum of the power utilization operation power of the power plant and the feeder power of the industrial park; when the current generating power is larger than the first generating power value and smaller than the second generating power value, determining not to perform isolated network regulation; when the current generating power is larger than the second generating power value, determining to perform isolated network regulation; when the current generating power is larger than the first generating power value and smaller than the second generating power value, sending a load switching control instruction to the unit, so that the unit responds to the load switching control instruction and closes a load switch for the industrial park feeder;
and when the judgment result is yes, switching the system from the power control loop to a rotating speed control loop, and performing frequency modulation control on the unit by using a preset rotating speed threshold value.
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