Ultra-long distance steam pipe network heat preservation control system and method based on new energy storage

Abstract

The application discloses a kind of based on new energy energy storage's super-long distance steam pipe network heat preservation control system and method.System includes super-long distance steam pipe network, multiple vertical axis wind turbine units distributedly arranged along steam pipe network, photovoltaic array installed with steam pipeline co-structure, multiple battery energy storage units distributedly arranged, multiple molten salt heat storage units distributedly arranged, multiple distributed electric heating compensation units, multiple heat exchange compensation units, energy management platform.The energy management platform dynamically adjusts the heating power of distributed electric heating compensation unit, heat exchange compensation unit, and carries out multimodal collaborative heat compensation to steam pipe network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply, in particular to a super-long distance steam pipe network heat preservation control system and method based on new energy energy storage. BACKGROUND

[0002] Nuclear energy comprehensive utilization and high energy consumption industry coupled development will further highlight the zero carbon value of nuclear energy, and can meet the diversified energy demand of high energy consumption industry. Using nuclear power steam in high energy consumption industries such as petrochemical industry can reduce carbon emissions, which is the key to solving energy waste. It can be seen that the existing steam pipe compensation heating technology mainly depends on the booster station or secondary boiler added along the pipeline, which has the defects of high energy consumption, complex operation and maintenance, and large carbon emissions. The existing technology CN201720142747.X discloses a heating device for heating and boosting long-distance heat supply pipe, which heats the heat supply pipe through a solar collector, a battery and a heating sleeve, but this technical solution has the defect of being greatly affected by weather, resulting in large heat loss. Therefore, how to ensure stable and efficient steam pipe compensation heating under the premise of reducing energy consumption and carbon emissions is a problem to be solved in the field. SUMMARY

[0003] The present application provides a super-long distance steam pipe network heat preservation control system based on new energy energy storage, which comprises a super-long distance steam pipe network, a plurality of vertical axis wind turbine units distributed along the steam pipe network, a photovoltaic array installed with the steam pipe, a plurality of battery energy storage units distributed, a plurality of molten salt heat storage units distributed, a plurality of distributed electric heating compensation units, a plurality of heat exchange compensation units and an energy management platform.

[0004] The vertical axis wind turbine unit is connected to the energy management platform through an AC / DC rectifier, the photovoltaic array is connected to the energy management platform through an MPPT controller and a DC / DC booster in turn, and the energy management platform is also connected to an alternating current power grid.

[0005] The energy management platform is connected to the battery energy storage unit through a bidirectional DC / DC controller, the energy management platform is connected to the molten salt heat storage unit and the distributed electric heating compensation unit, and the molten salt heat storage unit is connected to the heat exchange compensation unit.

[0006] Further, the energy management platform allocates the power output by the vertical axis wind turbine unit and the photovoltaic array to the distributed electric heating compensation unit during the daytime high temperature period, and stores the excess power to the battery energy storage unit, when the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit.

[0007] Further, the battery energy storage unit comprises a lithium battery pack and a super capacitor group, when the energy management platform detects that the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array is greater than a preset threshold, the energy management platform controls the lithium battery pack to store the excess power. then the super capacitor group starts to output power to the distributed electric heat compensation unit to achieve instantaneous response, and the lithium battery group starts to output power to the distributed electric heat compensation unit to compensate for the power gap caused by the sudden drop of the output power of the vertical axis wind turbine group and / or the photovoltaic array When the output power of the vertical axis wind turbine group and the photovoltaic array still maintains a power gradient

[0008] Further, the energy management platform allocates the power output by the vertical axis wind turbine group to the distributed electric heat compensation unit during the night low-temperature period, and stores the excess power to the battery energy storage unit. When the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit. At the same time, the energy management platform controls the molten salt pump in the molten salt heat storage unit to pump the molten salt to the heat exchange compensation unit to compensate for the large heat loss of the steam pipe network during the night low-temperature period.

[0009] Further, the energy management platform dynamically adjusts the heating power of the distributed electric heat compensation unit and the heat exchange compensation unit to perform multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates the power of the electric heat compensation unit and the heat exchange compensation unit far from the inlet of the steam pipe network.

[0010] Further, the electric heat compensation unit comprises a carbon fiber electric heat tracing belt arranged in the steam pipe at equal distances; and the heat exchange compensation unit comprises a shell-and-tube heat exchanger arranged in the steam pipe at equal distances.

[0011] The application also relates to a super-long-distance steam pipe network heat preservation control method based on new energy energy storage, which is used in the super-long-distance steam pipe network heat preservation control system based on new energy energy storage and comprises the following steps:

[0012] S11. The energy management platform allocates the power output by the vertical axis wind turbine group and the photovoltaic array to the distributed electric heat compensation unit, and stores the excess power to the battery energy storage unit. When the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit.

[0013] S12. If the energy management platform detects that the power gradient of the output power of the vertical axis wind turbine group and the photovoltaic array then the super capacitor group starts to output power to the distributed electric heat compensation unit to achieve instantaneous response, and the lithium battery group starts to output power to the distributed electric heat compensation unit to compensate for the power gap caused by the sudden drop of the output power of the vertical axis wind turbine group and / or the photovoltaic array

[0014] S13. If the energy management platform detects that the vertical axis wind turbine group, photovoltaic array output power power gradient then step S11 is performed; if the output voltage of the super capacitor group and the lithium battery group is lower than the respective threshold voltage and the vertical axis wind turbine group, photovoltaic array output power still maintains power gradient then step S14 is performed;

[0015] S14. The energy management platform allocates power from the alternating current power grid to the distributed electric heating compensation unit until the vertical axis wind turbine group, photovoltaic array output power power gradient then step S11 is repeatedly performed;

[0016] During the night low temperature period, the method comprises the following steps:

[0017] S21. The energy management platform allocates the power output by the vertical axis wind turbine group to the distributed electric heating compensation unit, and stores the excess power to the battery energy storage unit. When the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit. The energy management platform controls the molten salt pump in the molten salt heat storage unit to pump the molten salt to the shell and tube heat exchanger for constant power temperature compensation of the steam pipe network.

[0018] S22. If the energy management platform detects that the vertical axis wind turbine group output power power gradient then the super capacitor group is started to output power to the distributed electric heating compensation unit to achieve instantaneous response, and the lithium battery group is started to output power to the distributed electric heating compensation unit at a constant current;

[0019] S23. If the energy management platform detects that the vertical axis wind turbine group output power power gradient then step S21 is performed; if the output voltage of the super capacitor group and the lithium battery group is lower than the respective threshold voltage and the vertical axis wind turbine group output power still maintains power gradient then step S24 is performed;

[0020] S24. The energy management platform allocates power from the alternating current power grid to the distributed electric heating compensation unit until the vertical axis wind turbine group, output power power gradient then step S21 is repeatedly performed.

[0021] Further, the energy management platform allocates power to the distributed electric heating compensation unit, specifically comprising: the energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit to perform multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates the power of the electric heating compensation unit and the heat exchange compensation unit far from the inlet of the steam pipe network.

[0022] The dynamic adjustment of the heating power of the distributed electric heat compensation unit comprises controlling the power Q of the i-th electric heat compensation unit counted from the pipeline inlet i ,

[0023]

[0024] Q set is the same power reference value output to each electric heat compensation unit, AQ is the power adjustment value, beta is the control coefficient, x i is the shortest pipeline length of the i-th electric heat compensation unit counted from the pipeline inlet to the steam inlet of the pipeline network, and N is the number of electric heat compensation units.

[0025] The present application also relates to a computer program product, which comprises a computer program executed by a processor for executing the above-mentioned long-distance steam pipeline heat preservation control method based on new energy storage.

[0026] The present application also relates to a computer readable storage medium for storing a computer program executed by a processor for executing the above-mentioned long-distance steam pipeline heat preservation control method based on new energy storage.

[0027] The technical scheme of the present application dynamically adjusts the heating power of the distributed electric heat compensation unit and the heat exchange compensation unit through the energy management platform, performs multi-modal collaborative heat compensation on the steam pipeline network, and realizes stable and efficient steam pipeline compensation heating under the premise of reducing energy consumption and carbon emissions. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the structure diagram of the long-distance steam pipeline heat preservation control system based on new energy storage of the present application. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and cannot limit the protection scope of the present application. It should be pointed out that the following detailed description is exemplary, and is intended to provide further description of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is to be noted that, as used herein, the singular form "a", "an", and "the" include plural references unless the context clearly dictates otherwise. As used herein, the term "comprises" and / or "comprising" when used in this specification, unless the context dictates otherwise, means that the term "comprises" and / or "comprising" is taken to specify the presence of stated features, steps, operations, devices, components, and / or groups thereof, but does not preclude the presence or addition of one or more other features, steps, operations, devices, components, and / or groups thereof.

[0031] Embodiment 1 of the present application relates to a super-long distance steam pipe network heat preservation control system based on new energy energy storage, as shown in the accompanying drawings Figure 1 The system includes a super-long distance steam pipe network, a plurality of vertical axis wind turbine units distributedly arranged along the steam pipe network, a photovoltaic array installed with the steam pipe in the same framework, a plurality of battery energy storage units distributedly arranged, a plurality of molten salt heat storage units distributedly arranged, a plurality of distributed electric heating compensation units, a plurality of heat exchange compensation units, and an energy management platform.

[0032] The vertical axis wind turbine unit is connected to the energy management platform through an AC / DC rectifier, the photovoltaic array is connected to the energy management platform through an MPPT controller and a DC / DC booster in sequence, and the energy management platform is also connected to an alternating current power grid. The energy management platform is connected to the battery energy storage unit through a bidirectional DC / DC controller, and the energy management platform is connected to the molten salt heat storage unit and the distributed electric heating compensation unit. The molten salt heat storage unit is connected to the heat exchange compensation unit.

[0033] During the daytime high temperature period, the energy management platform allocates the power output by the vertical axis wind turbine unit and the photovoltaic array to the distributed electric heating compensation unit, and stores the excess power to the battery energy storage unit. When the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit.

[0034] The battery energy storage unit includes a lithium battery group and a super capacitor group. When the energy management platform detects that the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array is the super capacitor group starts to output power to the distributed electric heating compensation unit to realize instantaneous response, and the lithium battery group starts to output power to the distributed electric heating compensation unit at a constant current to compensate for the power gap caused by the sudden drop of the power output by the vertical axis wind turbine unit and / or the photovoltaic array. When the output voltage of the super capacitor group and the lithium battery group is lower than the respective threshold voltage and the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array is still maintained the energy management platform allocates power from the alternating current power grid to the distributed electric heating compensation unit until the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array is

[0035] The energy management platform allocates the power output by the vertical axis wind turbine unit to the distributed electric heating compensation unit during the night low temperature period, and stores the excess power to the battery energy storage unit, and when the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit. At the same time, the energy management platform controls the molten salt pump in the molten salt heat storage unit, pumps the molten salt to the heat exchange compensation unit, and compensates the constant power temperature of the steam pipe network, so as to compensate the large heat loss of the steam caused by the night low temperature period.

[0036] The energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit and the heat exchange compensation unit, performs multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates the power of the electric heating compensation unit and the heat exchange compensation unit far away from the inlet of the steam pipe network.

[0037] The electric heating compensation unit comprises a carbon fiber electric heating tape arranged in the steam pipe at equal intervals.

[0038] The heat exchange compensation unit comprises a shell-and-tube heat exchanger arranged in the steam pipe at equal intervals.

[0039] Embodiment 2 of the present application relates to a super-long distance steam pipe network heat preservation control method based on new energy energy storage.

[0040] During the daytime high temperature period, the method comprises the following steps:

[0041] S11. The energy management platform allocates the power output by the vertical axis wind turbine unit and the photovoltaic array to the distributed electric heating compensation unit, and stores the excess power to the battery energy storage unit, and when the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit.

[0042] S12. If the energy management platform detects that the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array then the super capacitor group is started to output power to the distributed electric heating compensation unit to realize instantaneous response, and the lithium battery group is started to output power to the distributed electric heating compensation unit in constant current discharge mode.

[0043] S13. If the energy management platform detects that the power gradient of the power output by the vertical axis wind turbine unit and the photovoltaic array then step S11 is performed; if the output voltage of the super capacitor group and the lithium battery group is lower than the respective threshold voltage and the power output by the vertical axis wind turbine unit and the photovoltaic array still maintains the power gradient

[0044] then step S14 is performed.

[0045] S14. The energy management platform dispatches power from the alternating current grid to the distributed electric heat compensation unit until the power gradient of the output power of the vertical axis wind turbine, photovoltaic array Then, step S11 is repeated.

[0046] During the night low temperature period, the method comprises the following steps:

[0047] S21. The energy management platform dispatches the output power of the vertical axis wind turbine to the distributed electric heat compensation unit, and stores the excess power to the battery energy storage unit. When the battery energy storage unit reaches the full power state, the energy management platform stores the excess power to the molten salt heat storage unit. The energy management platform controls the molten salt pump in the molten salt heat storage unit to pump the molten salt to the shell-and-tube heat exchanger for constant power temperature compensation of the steam pipe network.

[0048] S22. If the energy management platform detects that the power gradient of the output power of the vertical axis wind turbine The super capacitor group is started to output power to the distributed electric heat compensation unit for instantaneous response, and the lithium battery group is started to output power to the distributed electric heat compensation unit for constant current discharge.

[0049] S23. If the energy management platform detects that the power gradient of the output power of the vertical axis wind turbine Step S21 is performed; if the output voltage of the super capacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine still maintains the power gradient Step S24 is performed.

[0050] S24. The energy management platform dispatches power from the alternating current grid to the distributed electric heat compensation unit until the power gradient of the output power of the vertical axis wind turbine Then, step S21 is repeated.

[0051] In the above method, the energy management platform dispatches power to the distributed electric heat compensation unit, specifically comprising: the energy management platform dynamically adjusts the heating power of the distributed electric heat compensation unit, performs multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates power for the electric heat compensation unit and the heat exchange compensation unit far from the inlet of the steam pipe network.

[0052] Specifically, the dynamic adjustment of the heating power of the distributed electric heat compensation unit comprises controlling the power Q i ,

[0053]

[0054] Q setFor the same power reference value output to each electric heat compensation unit, ΔQ is a power adjustment value, β is a control coefficient, x i For the shortest pipe length of the i-th electric heat compensation unit from the pipe inlet to the steam inlet of the pipe network, N is the number of electric heat compensation units.

[0055] Embodiment 3 of the present application relates to a computer program product, the computer program product comprising a computer program, the computer program being executed by a processor for executing the super-long distance steam pipe network heat preservation control method based on new energy energy storage of embodiment 2.

[0056] Embodiment 4 of the present application relates to a computer readable storage medium for storing a computer program, the computer program being executed by a processor for executing the super-long distance steam pipe network heat preservation control method based on new energy energy storage of embodiment 2.

[0057] As described above, only the preferred embodiments of the present application, it should be noted that for those skilled in the art, without departing from the technical principles of the present application, can also make a number of improvements and variations, these improvements and variations should also be considered as the protection scope of the present application.

Claims

1. A super-long distance steam pipe network heat preservation control system based on new energy energy storage, characterized by, The system comprises an ultra-long distance steam pipe network, a plurality of vertical axis wind turbine units distributed along the steam pipe network, a photovoltaic array installed with the steam pipe, a plurality of battery energy storage units distributed, a plurality of molten salt heat storage units distributed, a plurality of distributed electric heating compensation units, a plurality of heat exchange compensation units, and an energy management platform. The vertical axis wind turbine unit is connected to the energy management platform through an AC / DC rectifier, and the photovoltaic array is connected to the energy management platform through an MPPT controller and a DC / DC booster in sequence. The energy management platform is connected to the battery energy storage unit through a bidirectional DC / DC controller, and is connected to the molten salt heat storage unit and the distributed electric heating compensation unit. The energy management platform allocates the power output by the vertical axis wind turbine unit and the photovoltaic array to the distributed electric heating compensation unit during the daytime high-temperature period, and stores the excess power into the battery energy storage unit. The battery energy storage unit comprises a lithium battery pack and a super capacitor pack, when the energy management platform detects that the output power of the vertical axis wind turbine unit and the photovoltaic array has a power gradient , the super capacitor pack is started to output power to the distributed electric heating compensation unit to realize instantaneous response, and the lithium battery pack is started to output power to the distributed electric heating compensation unit at constant current to compensate for the power gap caused by the sudden drop of the output power of the vertical axis wind turbine unit and / or the photovoltaic array, when the output voltage of the super capacitor pack and the lithium battery pack is lower than the respective threshold voltage and the output power of the vertical axis wind turbine unit and the photovoltaic array still maintains the power gradient , the energy management platform allocates power from the alternating current power grid to the distributed electric heating compensation unit until the output power of the vertical axis wind turbine unit and the photovoltaic array has a power gradient ; The energy management platform allocates the power output by the vertical axis wind turbine unit to the distributed electric heating compensation unit during the nighttime low-temperature period, and stores the excess power into the battery energy storage unit.

2. The ultra-long distance steam pipe network heat preservation control system based on new energy storage according to claim 1, characterized in that, The energy management platform controls the molten salt pump in the molten salt heat storage unit to pump the molten salt to the heat exchange compensation unit to compensate for the constant power temperature of the steam pipe network.

3. The ultra-long distance steam pipe network heat preservation control system based on new energy storage according to claim 1, characterized in that, The energy management platform dynamically adjusts the heating power of the distributed electric heating compensation unit and the heat exchange compensation unit to perform multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates the power of the distributed electric heating compensation unit and the heat exchange compensation unit at the far end of the steam pipe network.

4. A method for controlling the heat preservation of a super-long distance steam pipe network based on new energy storage, the method being used in a system for controlling the heat preservation of a super-long distance steam pipe network based on new energy storage according to any one of claims 1-3, characterized in that, The distributed electric heating compensation unit comprises carbon fiber electric heating tapes arranged in the steam pipe at equal distances, and the heat exchange compensation unit comprises shell-and-tube heat exchangers arranged in the steam pipe at equal distances. During the daytime high-temperature period, the method comprises the following steps: S12. If the energy management platform detects that the power gradient of the vertical axis wind turbine unit and the photovoltaic array output power , the super capacitor group is started to output power to the distributed electric heating compensation unit to realize instantaneous response, and the lithium battery group is started to discharge at a constant current to output power to the distributed electric heating compensation unit; S13. If the energy management platform detects a power ramp of the output power of the vertical axis wind turbine group, the photovoltaic array then step S11 is performed; if the output voltage of the supercapacitor group and the lithium battery group is lower than the respective threshold voltage and the output power of the vertical axis wind turbine group, the photovoltaic array still maintains the power ramp then step S14 is performed; S14. The energy management platform dispatches power from the alternating current grid to the distributed electric heat compensation unit, until the power gradient of the vertical axis wind turbine set, the photovoltaic array output power then step Sll is repeatedly executed; S11. The energy management platform allocates the power output by the vertical axis wind turbine unit and the photovoltaic array to the distributed electric heating compensation unit, and stores the excess power into the battery energy storage unit. During the nighttime low-temperature period, the method comprises the following steps: S21. The energy management platform allocates the power output by the vertical axis wind turbine unit to the distributed electric heating compensation unit, and stores the excess power into the battery energy storage unit. S22. If the energy management platform detects that the power gradient of the output power of the vertical axis wind turbine unit , the super capacitor group is started to output power to the distributed electric heating compensation unit for instantaneous response, and the lithium battery group is started to discharge at a constant current to output power to the distributed electric heating compensation unit. S23. If the energy management platform detects a power gradient of the output power of the vertical axis wind turbine set then step S21 is performed; if the output voltage of the super capacitor set and the lithium battery set is lower than the respective threshold voltage and the output power of the vertical axis wind turbine set still maintains the power gradient then step S24 is performed; S24. The energy management platform dispatches power from the AC grid to the distributed electric-thermal compensation unit, up to the vertical axis wind turbine set, the power gradient of the output power S21. If the output power of the vertical axis wind turbine set is less than the power threshold, repeat step S21.

5. The ultra-long distance steam pipe network heat preservation control method based on new energy energy storage according to claim 4, characterized in that, The energy management platform allocates power to the distributed electric heat compensation unit, specifically comprising: the energy management platform dynamically adjusts the heating power of the distributed electric heat compensation unit, performs multi-modal collaborative heat compensation on the steam pipe network, and preferentially compensates power for the distributed electric heat compensation unit and the heat exchange compensation unit far from the inlet of the steam pipe network. The dynamic adjustment of the heating power of the distributed electric heat compensation unit specifically includes controlling the power of the first distributed electric heat compensation unit counted from the pipeline inlet , ； wherein, Pbase is the same power reference value output to each distributed electrothermal compensation unit, Preg is the power regulation value, K is the control coefficient, N is the number of distributed electrothermal compensation units, L is the shortest pipe length from the steam inlet of the pipe network to the nth distributed electrothermal compensation unit counted from the pipe inlet, and N is the number of distributed electrothermal compensation units.

6. A computer program product, characterised in that, The computer program product comprises a computer program, which is executed by a processor, and is used for executing the new energy storage-based ultra-long distance steam pipe network heat preservation control method of claim 4 or 5.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium is used for storing a computer program, which is executed by a processor, and is used for executing the new energy storage-based ultra-long distance steam pipe network heat preservation control method of claim 4 or 5.

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