Method, system and equipment for absorbing redundant electric quantity of FCB working condition of coal power unit and medium

Abstract

The invention discloses a method, a system, equipment and a medium for absorbing FCB working condition redundant electric quantity of a coal power unit, and the method comprises the steps: reducing the electrical load of the unit to the corresponding minimum electrical load when a boiler is in a stable dry state after an FCB signal is triggered during dry state operation; during wet operation, after an FCB signal is triggered, the unit keeps the current electrical load unchanged; when the unit electrical load is higher than the plant electrical load and there is no grid-connected signal, the part, higher than the plant electrical load, of the unit electrical load is stored in the battery energy storage device; when the unit electric load is equal to the plant electric load and no grid-connected signal exists, the charging process of the battery energy storage device is automatically ended; and when the unit electrical load is smaller than the auxiliary power load and no grid-connected signal exists, the battery energy storage device serves as a standby power supply, the battery energy storage device discharges and supplies energy to meet the auxiliary power demand, and the method, the system, the equipment and the medium can guarantee smooth transition between the grid-connected working condition and the FCB working condition.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation, and relates to a method, system, equipment and medium for absorbing redundant power of a coal-fired power unit in FCB condition. Background Art

[0002] FCB (Fast Cut Back) refers to the automatic control function that enables the generator set to be disconnected from the grid due to line fault or grid fault, instantly remove all external power supply, and quickly reduce the output to maintain its own power supply without extinguishing the boiler.

[0003] In order to cope with the large-scale power outages that may occur in the power grid, how to quickly restore power supply has been regarded as an important research topic at home and abroad, among which FCB has become the focus of attention of all parties. During the FCB process, the generator is disconnected from the system, the steam turbine and boiler operate normally, the bypass of the operating generator set is quickly opened, and the boiler quickly reduces the load to achieve rapid output reduction to maintain its own power supply operation, that is, island operation. For large generator sets, if they have FCB functions, they can also fully or partially restore the power supply operation of the generator set in a very short time through self-rescue mode in the case of large-scale power grid failures, further ensuring the safety of the main equipment of the generator set, and at the same time restore external power supply, forming a spark that can set the prairie on fire, bringing huge benefits to the rapid recovery of the local power grid. Whether from the perspective of meeting technical specifications or improving network source coordination, safety and reliability, it is an inevitable trend to carry out FCB functional flexibility transformation of thermal power units. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, system, device and medium for absorbing the redundant power of coal-fired power units in FCB working condition, which can ensure a smooth transition between grid-connected working condition and FCB working condition.

[0005] To achieve the above object, the present invention discloses a method for absorbing redundant power of a coal-fired power unit in FCB condition, comprising:

[0006] In dry operation, when the FCB signal is triggered, the unit electrical load is reduced to the minimum electrical load corresponding to the boiler stable dry state;

[0007] In wet operation, when the FCB signal is triggered, the unit maintains the current electrical load unchanged;

[0008] When the unit power load is higher than the plant power load and there is no grid connection signal, the portion of the unit power load that exceeds the plant power load is stored in the battery energy storage device;

[0009] When the unit power load is equal to the plant power load and there is no grid connection signal, the charging process of the battery energy storage device will automatically end;

[0010] When the unit power load is less than the plant power load and there is no grid-connected signal, the battery energy storage device will act as a backup power source and discharge to supply energy to meet the plant power demand.

[0011] The method for absorbing the redundant power of the coal-fired power generation unit under FCB condition of the present invention is further improved in that:

[0012] Furthermore, during dry operation, when the FCB signal is triggered, the unit uses the RB fast load reduction control loop to reduce the unit's electrical load to the minimum electrical load corresponding to the boiler's stable dry state.

[0013] Furthermore, it also includes:

[0014] In extreme cases where the entire plant loses power and the grid is unable to supply power, the battery energy storage device will be used as a starting power source.

[0015] Furthermore, it also includes:

[0016] Under trough conditions, the battery energy storage device is controlled to charge and store energy.

[0017] Furthermore, it also includes:

[0018] Under peak operating conditions, the battery energy storage device is controlled to supply energy.

[0019] The present invention discloses a system for absorbing redundant power of a coal-fired power unit under FCB condition, comprising:

[0020] The first control module is used to reduce the unit electrical load to the minimum electrical load corresponding to the boiler in a stable dry state when the FCB signal is triggered during dry operation;

[0021] The second control module is used to maintain the current electrical load of the unit unchanged when the FCB signal is triggered during wet operation;

[0022] The third control module is used to store the portion of the unit power load that exceeds the plant power load in the battery energy storage device when the unit power load is higher than the plant power load and there is no grid connection signal;

[0023] The fourth control module is used to automatically end the charging process of the battery energy storage device when the unit power load is equal to the plant power load and there is no grid connection signal;

[0024] The fifth control module is used to use the battery energy storage device as a backup power source when the unit power load is less than the plant power load and there is no grid-connected signal. The battery energy storage device discharges and supplies energy to meet the plant power demand.

[0025] The further improvement of the system for absorbing the redundant power of coal-fired power generation units under FCB condition of the present invention is:

[0026] Furthermore, during dry operation, when the FCB signal is triggered, the unit uses the RB fast load reduction control loop to reduce the unit's electrical load to the minimum electrical load corresponding to the boiler's stable dry state.

[0027] Furthermore, it also includes:

[0028] The sixth control module is used to use the battery energy storage device as a starting power source in extreme circumstances when the entire plant loses power and the power grid is unable to supply power.

[0029] The present invention discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for absorbing redundant power of a coal-fired power unit in FCB condition are implemented.

[0030] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for absorbing redundant power of a coal-fired power unit in FCB condition are implemented.

[0031] The present invention has the following beneficial effects:

[0032] The method, system, device and medium for absorbing the redundant power of the coal-fired power unit in the FCB condition described in the present invention utilize the charging and discharging process of the battery energy storage device to absorb the redundant power of the coal-fired power unit in the PCB condition during specific operation, thereby ensuring a smooth transition between the grid-connected condition and the FCB condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0038] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0039] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0040] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0043] Embodiment 1

[0044] refer to Figure 1 The method for absorbing the redundant power of the coal-fired power unit in FCB mode of the present invention comprises the following steps:

[0045] 1) During dry operation, when the FCB signal is triggered, the unit will use the RB fast load reduction control loop to reduce the unit's electrical load to the minimum electrical load corresponding to the boiler's stable dry state.

[0046] It should be noted that when the unit is running in dry state, the load is generally above 30% of the rated electrical load, and some special furnace types are running in dry state at above 50% of the rated electrical load. After the running generator set triggers the FCB signal, the unit uses the RB fast load reduction control circuit to make the unit's electrical load drop back to the minimum electrical load corresponding to the boiler's stable dry state, so as to ensure the stable operation of the unit.

[0047] 2) During wet operation, when the FCB signal is triggered, the unit maintains the current electrical load unchanged.

[0048] 3) When the unit power load is higher than the plant power load and there is no grid connection signal, the portion of the unit power load that exceeds the plant power load is stored in the battery energy storage device, and the battery energy storage device is charged.

[0049] 4) When the unit power load is equal to the plant power load and there is no grid connection signal, the charging process of the battery energy storage device ends automatically.

[0050] 5) When the unit power load is less than the plant power load and there is no grid-connected signal, the battery energy storage device acts as a backup power source. The battery energy storage device discharges and supplies energy to meet the plant power demand, ensuring that the unit remains in operation under FCB conditions and avoiding power outages in the entire plant.

[0051] It should be noted that the general plant power consumption rate is about 5% of the rated unit load. The redundant power is stored in the battery energy storage device during the process from FCB triggering to the unit load dropping to the plant load. After calculation, the capacity of the battery energy storage device only needs to reach 25% of the unit rated load h or more to meet the FCB process energy storage requirements. The maximum charge and discharge rate requirement of the battery energy storage device is > the minimum load of the unit during dry operation, which is generally 30%-50% of the rated unit load.

[0052] When the FCB function is triggered, when the unit power load is greater than the plant power load, the part of the power generated by the unit that exceeds the plant power load is stored in the battery energy storage device, and then the unit power load is gradually reduced to match the plant power load. When the unit power load is equal to the plant power load, the charging process of the battery energy storage device is completed.

[0053] When the power load of the unit when triggering FCB is lower than the plant power load, the battery energy storage device plays the role of a backup power supply, discharging to maintain the plant power demand, ensuring that the unit can remain in operation under FCB conditions and avoiding power outages in the entire plant.

[0054] In addition, in extreme cases where the entire plant loses power and the grid is unable to deliver power, the battery energy storage device can also be used as a starting power source. Under normal operating conditions, the battery energy storage device can also be used for peak load regulation: under trough conditions, it can be charged and stored to improve the safety of unit operation; under peak conditions, it can be discharged to assist when the unit is not at full load, such as in summer conditions or steam supply units, to improve the economic benefits of the power plant.

[0055] Embodiment 2

[0056] The present invention discloses a system for absorbing redundant power of a coal-fired power unit under FCB condition, comprising:

[0057] The first control module is used to reduce the unit electrical load to the minimum electrical load corresponding to the boiler in a stable dry state when the FCB signal is triggered during dry operation;

[0058] The second control module is used to maintain the current electrical load of the unit unchanged when the FCB signal is triggered during wet operation;

[0059] The third control module is used to store the portion of the unit power load that exceeds the plant power load in the battery energy storage device when the unit power load is higher than the plant power load and there is no grid connection signal;

[0060] The fourth control module is used to automatically end the charging process of the battery energy storage device when the unit power load is equal to the plant power load and there is no grid connection signal;

[0061] The fifth control module is used to use the battery energy storage device as a backup power source when the unit power load is less than the plant power load and there is no grid-connected signal. The battery energy storage device discharges and supplies energy to meet the plant power demand.

[0062] The further improvement of the system for absorbing the redundant power of coal-fired power generation units under FCB condition of the present invention is:

[0063] Furthermore, during dry operation, when the FCB signal is triggered, the unit uses the RB fast load reduction control loop to reduce the unit's electrical load to the minimum electrical load corresponding to the boiler's stable dry state.

[0064] Furthermore, it also includes:

[0065] The sixth control module is used to use the battery energy storage device as a starting power source in extreme circumstances when the entire plant loses power and the power grid is unable to supply power.

[0066] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0067] Embodiment 3

[0068] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for absorbing redundant power of a coal-fired power unit under FCB condition are implemented, for example, comprising: in dry operation, when an FCB signal is triggered, the unit power load is reduced to the minimum power load corresponding to the boiler in a stable dry state; in wet operation, when the FCB signal is triggered, the unit maintains the current power load unchanged; when the unit power load is higher than the plant power load and there is no grid connection signal, the portion of the unit power load that exceeds the plant power load is stored in a battery energy storage device; when the unit power load is equal to the plant power load and there is no grid connection signal, the charging process of the battery energy storage device is automatically terminated; when the unit power load is less than the plant power load and there is no grid connection signal, the battery energy storage device acts as a backup power supply, and the battery energy storage device discharges and supplies energy to meet the plant power demand. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, network interface, and memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0069] Embodiment 4

[0070] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for absorbing the redundant power of the coal-fired power unit in the FCB condition are implemented, for example, including: in dry operation, when the FCB signal is triggered, the unit's electrical load is reduced to the minimum electrical load corresponding to the boiler in a stable dry state; in wet operation, when the FCB signal is triggered, the unit maintains the current electrical load unchanged; when the unit's electrical load is higher than the plant power load and there is no grid-connected signal, the portion of the unit's electrical load that is higher than the plant power load is stored in a battery energy storage device; when the unit's electrical load is equal to the plant power load and there is no grid-connected signal, the charging process of the battery energy storage device is automatically terminated; when the unit's electrical load is less than the plant power load and there is no grid-connected signal, the battery energy storage device acts as a backup power supply, and the battery energy storage device discharges and supplies energy to meet the plant power demand. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0072] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0076] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for absorbing redundant power of coal-fired power units in FCB mode, characterized in that: include: In dry operation, when the FCB signal is triggered, the unit electrical load is reduced to the minimum electrical load corresponding to the boiler stable dry state; In wet operation, when the FCB signal is triggered, the unit maintains the current electrical load unchanged; When the unit power load is higher than the plant power load and there is no grid connection signal, the portion of the unit power load that exceeds the plant power load is stored in the battery energy storage device; When the unit power load is equal to the plant power load and there is no grid connection signal, the charging process of the battery energy storage device will automatically end; When the unit power load is less than the plant power load and there is no grid-connected signal, the battery energy storage device will act as a backup power source and discharge to supply energy to meet the plant power demand.

2. The method for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 1 is characterized in that: During dry operation, when the FCB signal is triggered, the unit's electrical load is reduced to the minimum electrical load corresponding to the boiler's stable dry state through the RB fast load reduction control loop.

3. The method for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 1 is characterized in that: Also includes: In extreme cases where the entire plant loses power and the grid is unable to supply power, the battery energy storage device will be used as a starting power source.

4. The method for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 1 is characterized in that: Also includes: Under trough conditions, the battery energy storage device is controlled to charge and store energy.

5. The method for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 1 is characterized in that: Also includes: Under peak operating conditions, the battery energy storage device is controlled to supply energy.

6. A system for absorbing redundant power of coal-fired power units in FCB mode, characterized in that: include: The first control module is used to reduce the unit electrical load to the minimum electrical load corresponding to the boiler in a stable dry state when the FCB signal is triggered during dry operation; The second control module is used to maintain the current electrical load of the unit unchanged when the FCB signal is triggered during wet operation; The third control module is used to store the portion of the unit power load that exceeds the plant power load in the battery energy storage device when the unit power load is higher than the plant power load and there is no grid connection signal; The fourth control module is used to automatically end the charging process of the battery energy storage device when the unit power load is equal to the plant power load and there is no grid connection signal; The fifth control module is used to use the battery energy storage device as a backup power source when the unit power load is less than the plant power load and there is no grid-connected signal. The battery energy storage device discharges and supplies energy to meet the plant power demand.

7. The system for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 6 is characterized in that: During dry operation, when the FCB signal is triggered, the unit's electrical load is reduced to the minimum electrical load corresponding to the boiler's stable dry state through the RB fast load reduction control loop.

8. The system for absorbing redundant power of coal-fired power generation units in FCB condition according to claim 6 is characterized in that: Also includes: The sixth control module is used to use the battery energy storage device as a starting power source in extreme circumstances when the entire plant loses power and the power grid is unable to supply power.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for accommodating redundant power of the coal-fired power unit in FCB condition as described in any one of claims 1-5 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for accommodating redundant power of a coal-fired power unit in FCB condition as described in any one of claims 1 to 5 are implemented.

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