Storage, grid connection method, device and equipment for isolated grid operation of refining enterprises

Abstract

The present invention discloses a method, device and equipment for grid connection of a storage device and a refinery after isolated grid operation, wherein the method comprises the steps of: calculating the material supply amount of the feed tank according to the material inventory and material receiving amount of the feed tank of the process device; calculating the adaptive power output of the feed pump of the process device according to the material supply amount of the feed tank of the process device and the material demand of the process device under normal production conditions; calculating the output ratio of the adaptive power output of the feed pump to the rated power, and determining the control scheme of the feed pump of each process device according to the output ratio; adjusting each feed pump in turn according to the control scheme when grid connected to restore the production capacity of the process device to the normal production state, and reducing the output of the feed tank of the process device according to the feed increment of the feed pump; the present invention can effectively avoid the collapse of the power grid caused by the rush to start the pump, thereby reducing the possibility of grid connection failure of the refinery after isolated grid operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and in particular to a method, device and equipment for connecting to a storage device and a refinery after isolated grid operation. Background Art

[0002] Refining and chemical enterprises generally consume a lot of energy, and their requirements for energy supply reliability are relatively high. Usually, refining and chemical enterprises will have cogeneration units to provide heat and electricity; cogeneration units generally adopt the steam-to-electricity operation mode, that is, steam supply is guaranteed first, and then the external power grid provides electricity shortage.

[0003] Under normal operating conditions, the power grid of the cogeneration unit is relatively reliable due to the support of the external power grid. At this time, the material transportation control method of each process in the production process of the refining enterprise is generally to ensure the material balance of the corresponding process equipment by adjusting the output power of the feed pump.

[0004] Enterprise isolated grid operation refers to a situation where the internal power system of a refinery loses the supplementary power supply from the external power grid due to a power system accident; at this time, it is generally necessary to rely on the refinery's own thermal power units to ensure the normal operation of some important loads, and then restart full production after the grid is restored.

[0005] After research, the inventor found that when the external power grid of a refinery returns to normal and the normal production level of the refinery is restored by connecting to the grid, there is a risk of power grid collapse due to disorderly increase of load and startup of pumps.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to reduce the risk of power grid collapse when a refinery enterprise is connected to the grid after isolated grid operation.

[0008] The present invention provides a method for connecting to a grid after isolated grid operation of a refinery, comprising the steps of:

[0009] S11, calculating the material supply amount of the feed tank according to the material inventory of the feed tank of the process device and the material receiving amount of the feed tank during the grid connection period;

[0010] S12, according to the material supply of the feed tank of the process device and the material demand of the process device under normal production state, calculate the adaptive power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time;

[0011] S13, calculating the output ratio of the adapted power output to the rated power of the feeder pump, and determining the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state;

[0012] S14. When connected to the grid, the feed pumps are adjusted in sequence according to the control scheme to restore the production capacity of the process device to a normal production state, and the output of the feed tank of the process device is reduced accordingly according to the feed increment of the feed pump.

[0013] The present invention also includes:

[0014] S15. When the process device is restored to a normal production state, the material balance of the process device is controlled by preferentially adjusting the discharge amount of the feed tank of the process device.

[0015] In the present invention, the grid connection time is predicted based on the number of process units of the refinery and the control complexity of the grid load.

[0016] In the present invention, the method of determining the adapted power output of the feed pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time according to the material demand of the process device and the material supply of the feed tank includes:

[0017] When the material supply is greater than the material demand, the adaptive power output of the feeder pump of the process device is zero.

[0018] In the present invention, the determination of the adapted power output of the feeder pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time according to the material demand of the process device and the material supply of the feed tank also includes:

[0019] When the material supply is greater than 60% of the material demand, the adapted power output of the feeder pump of the process device is 50% of the normal working power.

[0020] In the present invention, the determination of the adapted power output of the feeder pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time according to the material demand of the process device and the material supply of the feed tank also includes:

[0021] When the material supply is lower than 20% of the material demand, the adapted power output of the feeder pump of the process device is the normal working power.

[0022] In the present invention, the control scheme also includes:

[0023] For feed pumps with an adapted power output of zero, priority is given to increasing the output power of the feed pump with the lowest output power that maintains basic operation.

[0024] In the present invention, the control scheme also includes:

[0025] The control batches of the feed pumps are determined according to the order of control of the feed pumps; a control interval of a preset time is set between each control batch.

[0026] In another aspect of the present invention, a grid-connected device for a refinery after isolated grid operation is provided, comprising:

[0027] A storage tank material calculation unit, used to calculate the material supply quantity of the feed tank according to the material inventory of the feed tank of the process device and the material receiving quantity of the feed tank within the grid connection time;

[0028] A pump power calculation unit, for calculating the adapted power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time according to the material supply of the feed tank of the process device and the material demand of the process device under the normal production state;

[0029] A control scheme generating unit is used to calculate the output ratio of the adapted power output to the rated power of the feeder pump, and determine the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state;

[0030] A feed control unit is used to adjust each of the feed pumps in sequence according to the control scheme when connected to the grid to restore the production capacity of the process device to a normal production state, and to reduce the output of the feed tank of the process device accordingly according to the feed increment of the feed pump.

[0031] The present invention also includes:

[0032] The material balance control unit is used to control the material balance of the process device by preferentially adjusting the discharge amount of the feed tank of the process device during the process of the process device returning to a normal production state.

[0033] On the other hand, the present invention further provides a memory including a software program, wherein the software program is suitable for a processor to execute the steps of the above-mentioned method for connecting to the grid after the isolated grid operation of the refinery.

[0034] Another aspect of an embodiment of the present invention further provides a grid-connected device for an isolated grid-connected refinery, wherein the grid-connected device for an isolated grid-connected refinery includes a computer program stored in a memory, wherein the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the methods described in the above aspects and achieves the same technical effects.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] In the present invention, the total amount of material that can be obtained by the process device through its feed tank during the grid connection period (i.e., the material supply amount) is calculated through the current material inventory of the feed tank of each process device and the material receiving amount of the feed tank during the grid connection period; then, after obtaining the material supply amount of the process device, the feed pump delivery amount of the process device's feed pump that needs to deliver the material can be further calculated based on the material demand of the process device during the grid connection period; the output power of the feed pump is determined based on the feed pump delivery amount of the process device, and then the feed pump of each process device is obtained. adaptive power output; that is, the present invention determines the degree of dependence of the process device on the feed pump during the grid-connected period according to the material supply of the feed tank of the process device; the larger the output ratio of the adaptive power output to the rated power, the less sufficient the material supply of the feed tank, and the more feed delivery of the feed pump is required after the process device is restored to normal production capacity; when the output ratio of the adaptive power output to the rated power is zero, it means that even without the feed delivery of the feed pump, the feed tank can meet the feed supply required when the corresponding process device restores normal production capacity.

[0037] After determining the degree of dependence of the process device on the feed pump during grid connection, the present invention gives priority to increasing the output power of the feed pump with a higher degree of dependence, and gradually restores the output power of each feed pump to the normal grid state in batches. Through the present invention, the feed pump can be regulated in an orderly manner during the grid connection process to restore the overall production capacity of the refinery, so that the enterprise grid will not experience large fluctuations, thereby effectively avoiding the grid collapse caused by the rush to start the pump, and further reducing the possibility of failure of the refinery to connect to the grid after isolated grid operation.

[0038] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a step diagram of the grid connection method after the isolated grid operation of the refinery enterprise described in the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of the grid-connected device of the refinery enterprise after isolated grid operation in the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the grid-connected equipment of the refinery enterprise after isolated grid operation in the present invention. DETAILED DESCRIPTION

[0042] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0043] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0044] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0045] Embodiment 1

[0046] In order to reduce the risk of grid collapse when refineries are connected to the grid after isolated grid operation, Figure 1 As shown, in an embodiment of the present invention, a method for connecting to a grid after isolated grid operation of a refinery is provided, comprising the steps of:

[0047] S11, calculating the material supply amount of the feed tank according to the material inventory of the feed tank of the process device and the material receiving amount of the feed tank during the grid connection period;

[0048] For refineries operating in isolated grids, when the external grid resumes normal power supply, they need to connect to the grid as soon as possible to restore the power supply capacity of the enterprise grid and the production capacity of the refineries.

[0049] During isolated grid operation, in order to cope with the shortage of electric energy, the load on the grid will be reduced by stopping pumps and adjusting the output of feed pumps. After the external grid resumes normal power supply, the feed pumps that were stopped during isolated grid operation or whose output power was reduced need to be restored to the power output state during normal production when connected to the grid. However, there are a large number of feed pumps that need to be restarted or whose output power needs to be increased. Improper operation (such as rushing to start the pump) will cause excessive fluctuations in the grid or overcurrent in the interconnection line, thereby causing the grid to collapse and then cause grid connection failure.

[0050] In order to minimize the impact of the feed pump adjustment process on the enterprise power grid without affecting the recovery of the production capacity of the refining enterprise, the embodiment of the present invention adopts a method of adjusting the output power of the feed pump in batches or restarting the stopped feed pump.

[0051] The embodiment of the present invention first calculates the material supply quantity of the feed tank according to the material inventory of the feed tank of the process device and the material receiving quantity of the feed tank within the grid connection time.

[0052] Each process in each production process of a refinery is collaboratively implemented by multiple process devices; according to the front-end relationship of the process corresponding to the process device in the entire production process, each process device also has a corresponding upstream and downstream relationship; in the production process of a refinery, some process devices will transport part of their intermediate product oil to the corresponding storage tank; the downstream process device (process device B) can use the intermediate product oil stored in the storage tank (storage tank A) of its upstream process device (process device A) as feed, at this time, the storage tank (storage tank A) is the feed tank of process device B, and so on, the feed tank of each process device can be determined.

[0053] There are two ways to feed the process unit. One is to get it directly from the upstream process unit through the feed pump. In addition, most process units can also get it through the storage tank that serves as their feed tank. Compared with the discharge pump of the feed tank, the power consumption of the process unit's feed pump is much greater. Due to the isolated grid operation, the power output of the internal power system of the refinery is limited, and its load is relatively large. At this time, the start-stop conversion and power adjustment of the feed pump will cause greater fluctuations in the power grid of the internal power system of the refinery, which will in turn cause the risk of power grid collapse.

[0054] S12, according to the material supply of the feed tank of the process device and the material demand of the process device under normal production state, calculate the adaptive power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time;

[0055] After determining the amount of material that the feed tank of the process device can provide, it is also necessary to determine the material demand when the process device returns to normal production status; that is, the material demand of the process device during the completion of grid connection;

[0056] For process units equipped with feed tanks, the adaptive power output of the feed pump of the process unit can be determined according to the material demand of the process unit and the material supply of the feed tank when the process unit returns to normal production capacity. Specifically, if according to calculation, the material supply of the feed tank (storage tank A) of process unit B is 100 tons, and the material consumption of the process unit during the grid connection period is only 80 tons (that is, the material demand of process unit B is 80 tons), then the process unit can operate normally during the entire grid connection period without the feed input of the feed pump; at this time, the adaptive power output of process unit B is 0; correspondingly, if the material supply of the feed tank of process unit C is 80 tons, Tons, the material consumption of the process device during the grid connection period is 100 tons (that is, the material demand of process device C is 100 tons), then, the feed pump of process device C is required to provide at least 20 tons of feed gap, according to the feed delivery volume and feed gap at the normal operating power of the feed pump, the power output (that is, the adaptive power output) required to complete the feed gap can be determined; in actual applications, the calculation of the feed gap is generally based on the actual difference and then a certain margin is determined to avoid insufficient feed supply. For example, if the calculated feed gap is 20 tons, then a certain surplus can be added on this basis and then the adaptive power output of the feed pump can be calculated.

[0057] In practical applications, the method for determining the adapted power output of the feed pump of each process device during the grid connection period may be:

[0058] When the material supply is greater than the material demand, the adaptive power output of the feeder pump of the process device is zero. At this time, the process device can obtain sufficient feed through the feed tank, and the feed demand of the process device can be met without obtaining feed through the feeder pump during the grid connection period.

[0059] When the material supply is greater than 60% of the material demand, the adapted power output of the process device's feed pump is 50% of the normal working power. At this time, the process device can obtain more than 60% of the feed through the feed tank. During the grid connection period, the process device can obtain sufficient feed as long as its feed pump outputs 50% of the normal working power.

[0060] When the material supply is less than 20% of the material demand, the adapted power output of the process device's feed pump is the normal working power. At this time, the process device can only obtain less than 20% of the feed through the feed tank. During the grid connection period, the feed pump may be lower than the normal working power, which may cause insufficient feed supply. Therefore, the feed pump of the process device needs to be set to the normal working power to obtain sufficient feed.

[0061] It should be noted that the adaptive power output of the feed pump of each process device in the embodiment of the present invention can also be set and adjusted by technical personnel in this field based on experimental data or work experience. The above example is only one of the preferred schemes in the embodiment of the present invention and is not intended to be a specific limitation.

[0062] S13, calculating the output ratio of the adapted power output to the rated power of the feeder pump, and determining the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state;

[0063] In an embodiment of the present invention, the output ratio of the adapted power output to the rated power of the feed pump refers to the ratio of the adapted power output to the rated power; for example, taking the rated power of the process device as 400 kilowatts, when its adapted power input is 100 kilowatts, the output ratio is 100 / 400=0.25; when its adapted power input is 300 kilowatts, the output ratio is 300 / 400=0.75; when its adapted power input is 0, the output ratio is 0 / 400=0.

[0064] The output ratio of the rated power of the feed pump to the rated power can reflect the degree of dependence on the feed pump's feed and conveying capacity when maintaining the normal production capacity of the process unit during the grid connection period. The lower the output ratio, the lower the dependence on the feed pump's feed and conveying capacity. When the output ratio is 0, it means that even without the feed pump's feed conveying, the process unit can still operate at normal capacity by relying on the feed tank. The higher the output ratio, the higher the dependence on the feed pump's feed and conveying capacity. In order to make the process unit operate at normal capacity, it is necessary to increase the power output of the feed pump with a higher output ratio as soon as possible to increase the feed pump's feed delivery capacity. In other words, in order to restore the normal production capacity of the refining enterprise, the higher the output ratio of the feed pump, the greater the urgency of increasing its output power. Therefore, the feed pump with a higher output ratio should be adjusted first.

[0065] In an embodiment of the present invention, determining the control scheme of the feed pump of each process device according to the output share value means that the control order of the feed pump is determined according to the order of the output share values, so as to realize the orderly adjustment of the feed pump in batches; wherein, the output power of the feed pump of the process device with a higher degree of dependence on the feed pump is increased or restored first; in an embodiment of the present invention, the control of the feed pump may include adjusting the output power of the feed pump to the rated power required for the normal production state, or restarting the feed pump that was originally shut down.

[0066] On the other hand, the output ratio value in the embodiment of the present invention can also reflect the supply capacity of the feed tank of the process device. The lower the output ratio value of the feed pump of the process device, the more sufficient the material supply of the feed tank is, and at this time, the degree of dependence on the feed pump is also lower.

[0067] Furthermore, when there are multiple feed pumps with an output ratio of zero, the feed pump with the lowest output power that maintains basic operation can be adjusted first to increase the output power. Specifically, when operating in an isolated grid, some feed pumps are in the state of maintaining the minimum output power for basic operation. Although these feed pumps do not participate in the delivery of feed, in order to reduce the start-stop conversion of the pumps, a certain number of feed pumps can be maintained at the minimum output power state after the load reduction has been completed. Since the basic adjustment of these feeds does not involve the start-stop conversion of the pumps, the impact on the power grid is relatively small. Giving priority to adjusting these feed pumps with the lowest output power that maintain basic operation can reduce the impact on the power grid.

[0068] In practical applications, when adjusting the output power of each feed pump in batches, the interval time between batches can also be set, which is beneficial to the stability of the power grid and reduces the probability of power grid collapse.

[0069] S14. When connected to the grid, the feed pumps of each process device are adjusted in sequence according to the control scheme to restore the production capacity of the process device to a normal production state, and the output of the feed tank of the process device is reduced accordingly according to the feed increment of the feed pump.

[0070] As the delivery capacity of the feed pump increases, the output capacity of the feed tank of the process device can be reduced accordingly, thereby gradually transitioning the feeding method of the process device to mainly based on the feeding and delivery of the feed pump, that is, restoring the feeding and delivery method from the isolated network operation to the feeding and delivery method during normal production.

[0071] In summary, in the embodiment of the present invention, the total amount of material that the process device can obtain through its feed tank during the grid-connected period (i.e., the material supply amount) is calculated through the current material inventory of the feed tank of each process device and the material reception amount of the feed tank during the grid-connected period; then, after obtaining the material supply amount of the process device, the feed pump delivery amount of the process device's feed pump that needs to deliver the material can be further calculated based on the material demand of the process device during the grid-connected period; the output power of the feed pump is determined based on the feed pump delivery amount of the process device, and then the feed pump of each process device is obtained respectively. adaptive power output; that is, the embodiment of the present invention determines the degree of dependence of the process device on the feed pump during the grid-connected period according to the material supply of the feed tank of the process device; the larger the ratio of the adaptive power output to the output of the rated power, the less sufficient the material supply of the feed tank, and the more feed delivery of the feed pump is required after the process device is restored to normal production capacity; when the ratio of the adaptive power output to the output of the rated power is zero, it means that even without the feed delivery of the feed pump, the feed tank can meet the feed supply required when the corresponding process device restores normal production capacity.

[0072] After determining the degree of dependence of the process device on the feed pump during grid connection, the embodiment of the present invention gives priority to increasing the output power of the feed pump with a higher degree of dependence, and gradually restores the output power of each feed pump to the normal grid state in batches. Through the embodiment of the present invention, the control of the feed pump can be orderly in the process of grid connection and restoring the overall production capacity of the refinery, so that the enterprise grid will not experience large fluctuations, and thus can effectively avoid the collapse of the grid caused by the rush to start the pump, thereby reducing the possibility of the refinery failing to connect to the grid after isolated grid operation.

[0073] Furthermore, in the embodiment of the present invention, the steps may also be included:

[0074] S15. When the process device is restored to normal production status, the material balance of the process device is controlled by adjusting the discharge amount of the feed tank of the process device.

[0075] During the grid connection period, when controlling the material balance of the process device, the embodiment of the present invention no longer focuses on adjusting the feed amount of the feed pump, but achieves the material balance of the process device by adjusting the discharge amount of the feed tank. In this way, the adjustment probability and adjustment range of the power adjustment of the feed pump will be greatly reduced; because for the storage tank, the power of its discharge pump is much smaller than the power of the feed pump, so when the storage tank is used as the feed tank of a certain process device, the power grid fluctuation caused by adjusting the discharge amount of the feed tank will be much smaller than the power grid fluctuation caused by adjusting the feed pump. Therefore, the method of achieving the material balance of the process device by adjusting the discharge amount of the feed tank can avoid large power grid fluctuations caused by the power adjustment of the feed pump, thereby reducing the risk of power grid collapse caused by this.

[0076] It should be noted that the grid connection method of the refinery after isolated grid operation in the embodiment of the present invention can also be used in combination with the grid connection technical scheme in the prior art as one of the ranking bases for adjusting the feed pumps in batches when designing the grid connection scheme.

[0077] Embodiment 2

[0078] In another aspect of the embodiment of the present invention, a grid-connected device for a refinery after isolated grid operation is provided. Figure 2 The schematic diagram of the structure of the grid-connected device of the refinery after isolated grid operation provided by the embodiment of the present invention is shown. The grid-connected device of the refinery after isolated grid operation is connected to Figure 1 The device corresponding to the grid connection method after the isolated grid operation of the refinery enterprise described in the corresponding embodiment, that is, the virtual device is used to realize Figure 1 In the corresponding embodiment, the grid-connected method of the refinery after isolated grid operation, each virtual module constituting the grid-connected device of the refinery after isolated grid operation can be executed by an electronic device, such as a network device, a terminal device, or a server. Specifically, the grid-connected device of the refinery after isolated grid operation in the embodiment of the present invention includes:

[0079] The storage tank material calculation unit 01 is used to calculate the material supply amount of the feed tank according to the material inventory of the feed tank of the process device and the material receiving amount of the feed tank within the grid connection time;

[0080] The pump power calculation unit 02 is used to calculate the adapted power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time according to the material supply of the feed tank of the process device and the material demand of the process device under the normal production state;

[0081] The control scheme generating unit 03 is used to calculate the output ratio of the adapted power output of the feeder pump to the rated power, and determine the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state;

[0082] The feed control unit 04 is used to adjust each of the feed pumps in sequence according to the control plan when connected to the grid to restore the production capacity of the process device to the normal production state, and reduce the output of the feed tank of the process device accordingly according to the feed increment of the feed pump.

[0083] Furthermore, in the embodiment of the present invention, the following may also be included:

[0084] The material balance control unit 05 is used to control the material balance of the process device by preferentially adjusting the discharge amount of the feed tank of the process device during the process of the process device returning to the normal production state.

[0085] Since the working principle and beneficial effects of the grid-connected device after the isolated grid operation of the refinery enterprise in the embodiment of the present invention have been Figure 1 The corresponding grid connection methods of the refineries after isolated grid operation are also recorded and explained, so they can be referenced by each other and will not be repeated here.

[0086] Embodiment 3

[0087] In an embodiment of the present invention, a memory is further provided, wherein the memory includes a software program, and the software program is suitable for the processor to execute Figure 1 The corresponding steps in the grid connection method after the isolated grid operation of the refinery.

[0088] The embodiments of the present invention can be implemented by means of a software program, that is, by writing a program for implementing Figure 1 The corresponding software program (and instruction set) for each step in the grid connection method after the isolated grid operation of the refinery is stored in a storage device, and the storage device is arranged in a computer device, so that the software program can be called by the processor of the computer device to achieve the purpose of the embodiment of the present invention.

[0089] Embodiment 4

[0090] In an embodiment of the present invention, a grid-connected device for a refinery after isolated grid operation is provided. The memory included in the grid-connected device for a refinery after isolated grid operation includes a corresponding computer program product. When the program instructions included in the computer program product are executed by a computer, the computer can execute the grid-connected method for a refinery after isolated grid operation described in the above aspects and achieve the same technical effect.

[0091] Figure 3 Schematic diagram of the hardware structure of the grid-connected equipment of the refinery enterprise after isolated grid operation as an electronic device according to the embodiment of the present invention. Figure 3 As shown, the device includes one or more processors 610, a bus 630, and a memory 620. Taking one processor 610 as an example, the device may also include: an input device 640, and an output device 650.

[0092] The processor 610, the memory 620, the input device 640 and the output device 650 may be connected via a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0093] The memory 620 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 610 executes various functional applications and data processing of the electronic device by running the non-transitory software programs, instructions, and modules stored in the memory 620, that is, the processing method of the above method embodiment is implemented.

[0094] The memory 620 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data, etc. In addition, the memory 620 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 620 may optionally include a memory remotely arranged relative to the processor 610, and these remote memories may be connected to the processing device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0095] The input device 640 can receive input digital or character information and generate signal input. The output device 650 can include a display device such as a display screen.

[0096] The one or more modules are stored in the memory 620, and when executed by the one or more processors 610, perform:

[0097] S11, calculating the material supply amount of the feed tank according to the material inventory of the feed tank of the process device and the material receiving amount of the feed tank during the grid connection period;

[0098] S12, according to the material supply of the feed tank of the process device and the material demand of the process device under normal production state, calculate the adaptive power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time;

[0099] S13, calculating the output ratio of the adapted power output to the rated power of the feeder pump, and determining the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state;

[0100] S14. When connected to the grid, the feed pumps of each process device are adjusted in sequence according to the control scheme to restore the production capacity of the process device to a normal production state, and the output of the feed tank of the process device is reduced accordingly according to the feed increment of the feed pump.

[0101] Preferably, in the embodiment of the present invention, it may also include:

[0102] S15. When the process device is restored to a normal production state, the material balance of the process device is controlled by preferentially adjusting the discharge amount of the feed tank of the process device.

[0103] The above product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0104] In the several embodiments provided by the present invention, it should be understood that the mentioned systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0105] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0106] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0107] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage device, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage device includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), ReRAM, MRAM, PCM, NAND Flash, NOR Flash, Memristor, disk or optical disk and other media that can store program codes.

[0108] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for connecting to a grid after isolated grid operation of a refinery, characterized in that: Includes steps: S11. Calculate the material supply amount of the feed tank according to the material inventory of the feed tank of the process device and the material receiving amount of the feed tank during the grid connection period; S12, according to the material supply of the feed tank of the process device and the material demand of the process device under normal production state, calculate the adaptive power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time; S13, calculating the output ratio of the adapted power output to the rated power of the feeder pump, and determining the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state; S14, when connected to the grid, adjusting each of the feed pumps in turn according to the control scheme to restore the production capacity of the process device to a normal production state, and reducing the output of the feed tank of the process device accordingly according to the feed increment of the feed pump; S15. When the process device is restored to a normal production state, the material balance of the process device is controlled by adjusting the discharge amount of the feed tank of the process device.

2. The method for connecting to the grid after isolated grid operation of a refinery according to claim 1, characterized in that: The grid connection time is predicted based on the number of process units of the refinery and the control complexity of the grid load.

3. The method for connecting to the grid after isolated grid operation of a refinery according to claim 1, characterized in that: The method of determining, based on the material demand of the process device and the material supply of the feed tank, the adapted power output of the feed pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time, comprises: When the material supply amount is greater than the material demand amount, the adaptive power output of the feeder pump of the process device is zero.

4. The method for connecting to the grid after isolated grid operation of a refinery according to claim 3, characterized in that: The method of determining, based on the material demand of the process device and the material supply of the feed tank, the adapted power output of the feed pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time, further includes: When the material supply is greater than 60% of the material demand, the adapted power output of the feeder pump of the process device is 50% of the normal working power.

5. The method for connecting to the grid after isolated grid operation of a refinery according to claim 4, characterized in that: The method of determining, based on the material demand of the process device and the material supply of the feed tank, the adapted power output of the feed pump of the process device when the state of ensuring material balance of the process device reaches the grid connection time, further includes: When the material supply is lower than 20% of the material demand, the adapted power output of the feeder pump of the process device is the normal working power.

6. The method for connecting to the grid after isolated grid operation of a refinery according to claim 5, characterized in that: The control scheme also includes: For the feeder pumps with an output ratio of zero, the feeder pump with the lowest output power that maintains basic operation is regulated to increase its output power.

7. The method for connecting to the grid after isolated grid operation of a refinery according to claim 5, characterized in that: The control scheme also includes: The control batches of the feed pumps are determined according to the order of control of the feed pumps; a control interval of a preset time is set between each control batch.

8. A grid-connected device for a refinery after isolated grid operation, characterized in that: include: A storage tank material calculation unit, used to calculate the material supply quantity of the feed tank according to the material inventory of the feed tank of the process device and the material receiving quantity of the feed tank within the grid connection time; A pump power calculation unit, for calculating the adapted power output of the feed pump of the process device to ensure that the process device maintains the normal production state for the grid-connected time according to the material supply of the feed tank of the process device and the material demand of the process device under the normal production state; A control scheme generating unit is used to calculate the output ratio of the adapted power output to the rated power of the feeder pump, and determine the control scheme of the feeder pump of each process device according to the output ratio; the control scheme includes: determining the control sequence of the feeder pump according to the high and low ranking of the output ratio; the control includes adjusting the output power of the feeder pump to the rated power required for the normal production state; A feed control unit, used for adjusting each of the feed pumps in sequence according to the control scheme when connected to the grid to restore the production capacity of the process device to a normal production state, and correspondingly reducing the output of the feed tank of the process device according to the feed increment of the feed pump; The material balance control unit is used to control the material balance of the process device by adjusting the discharge amount of the feed tank of the process device during the process of the process device returning to a normal production state.

9. A memory, characterized in that: It comprises a software program, which is suitable for a processor to execute the steps of the grid connection method after isolated grid operation of a refinery as described in any one of claims 1 to 7.

10. A grid-connected device for a refinery after isolated grid operation, characterized in that: comprising a bus, a processor and a memory as claimed in claim 9; The bus is used to connect the memory and the processor; The processor is configured to execute an instruction set in the memory.

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