Differential pressure power generation and flywheel energy storage coupling system and power generation method

Abstract

The invention discloses a differential pressure power generation and flywheel energy storage coupling system and a power generation method, the differential pressure power generation and flywheel energy storage coupling system comprises a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system comprises a flywheel energy storage unit and a dynamic voltage restorer, under the condition that the voltage of the differential pressure power generation system is normal, the flywheel energy storage unit is charged, and the flywheel energy storage unit is recovered. Under the condition of voltage sag or voltage sag, the flywheel energy storage unit supplies power to the auxiliary power load, under the condition of voltage sag or voltage sag, the flywheel energy storage unit is charged through the dynamic voltage restorer, and under the condition that voltage sag or voltage sag recovers normal voltage, the auxiliary power load is supplied with power through the power grid. According to the scheme, through the coupling differential pressure power generation and flywheel energy storage technology, electricity generated by the expansion machine is stored at any time and taken at any time when used, under the condition that the voltage of the differential pressure power generation system is abnormal, the stability of the voltage is guaranteed through the dynamic voltage recovery system, and therefore the stability of the differential pressure power generation system in the gas power station and the electric energy utilization efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a system and a power generation method for coupling differential pressure power generation and flywheel energy storage. Background Art

[0002] At present, in order to improve the utilization efficiency of natural gas, a natural gas expansion turbine is usually installed between the pipeline network and the gas turbine, so that the high-pressure natural gas can be reduced in pressure through the expansion turbine. While the pressure meets the needs of users, part of the pressure potential energy can be recovered to produce electricity. The electricity produced by the expansion turbine can be directly incorporated into the power system of the gas turbine power plant to drive the auxiliary equipment of the power plant and reduce the power consumption of the plant.

[0003] However, since gas turbine power plants are often tasked with peak load and frequency regulation, the output of the units often needs to be adjusted according to the load of the power grid, which causes fluctuations in the required natural gas consumption, affects the stability of the differential pressure power generation output, and thus cannot be stably integrated into the plant power system, resulting in low utilization rate of the generated electricity. Summary of the invention

[0004] The present application aims to at least solve the technical problems existing in the prior art. To this end, the first aspect of the present application proposes a system for coupling differential pressure power generation and flywheel energy storage, the system comprising a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system comprising a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein:

[0005] The differential pressure power generation system is used to charge the flywheel energy storage unit and supply power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal;

[0006] The differential pressure power generation system is also used to supply power to the factory power load through the flywheel energy storage unit in case of a temporary voltage drop or temporary voltage rise in the differential pressure power generation system;

[0007] The differential pressure power generation system is also used to charge the flywheel energy storage unit through a dynamic voltage restorer when the differential pressure power generation system recovers to normal voltage after a voltage sag or voltage swell, and to supply power to the factory power load through the power grid.

[0008] In a possible implementation, the dynamic voltage restorer includes a switch cabinet and a power cabinet, and the switch cabinet includes an electronic switch, wherein:

[0009] The differential pressure power generation system is used to charge the flywheel energy storage unit and supply power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal and the electronic switch is in the on state.

[0010] In a possible implementation, the power cabinet includes a bidirectional converter, wherein:

[0011] The differential pressure power generation system is used to charge the flywheel energy storage unit through the bidirectional converter when the voltage of the differential pressure power generation system is normal, and supply power to the factory power load through the power grid.

[0012] In a possible implementation, the differential pressure power generation system is also used to supply power to the factory power load after the electronic switch is in a fast shutdown state and the target rated voltage is output through the bidirectional converter of the flywheel energy storage unit when the voltage of the differential pressure power generation system temporarily drops or rises.

[0013] In a possible implementation, the differential pressure power generation system is also used for, when the differential pressure power generation system recovers to normal voltage after a voltage sag or voltage swell, the electronic switch is in the on state, the flywheel energy storage unit is charged through the bidirectional converter, and the factory power load is supplied through the power grid.

[0014] In a second aspect, the present application provides a power generation method coupled with differential pressure power generation and flywheel energy storage, which is applied to a system coupled with differential pressure power generation and flywheel energy storage as in the first aspect, wherein the system comprises a differential pressure power generation system and a dynamic voltage recovery system, wherein the dynamic voltage recovery system comprises a flywheel energy storage unit and a dynamic voltage restorer, wherein the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, and the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, and the method comprises:

[0015] When the voltage of the differential pressure power generation system is normal, the flywheel energy storage unit is charged and the power supply to the plant load is supplied through the power grid;

[0016] In case of voltage drop or voltage rise of the differential pressure power generation system, the flywheel energy storage unit is used to supply power to the plant power load;

[0017] When the voltage of the differential pressure power generation system is restored to normal after a voltage sag or voltage swell, the flywheel energy storage unit is charged through the dynamic voltage restorer, and the factory power load is supplied with power through the power grid.

[0018] In a possible implementation, when the voltage of the differential pressure power generation system is normal, the flywheel energy storage unit is charged, and power is supplied to the factory power load through the power grid, including:

[0019] When the voltage of the differential pressure power generation system is normal, the electronic switch is in the on state, charging the flywheel energy storage unit and supplying power to the factory power load through the power grid.

[0020] In a possible implementation, when the voltage of the differential pressure power generation system is normal, the flywheel energy storage unit is charged, and power is supplied to the factory power load through the power grid, further comprising:

[0021] When the voltage of the differential pressure power generation system is normal, the electronic switch is in the on state, charging the flywheel energy storage unit through the bidirectional converter and supplying power to the factory power load through the power grid.

[0022] In a possible implementation, in the case of a voltage sag or voltage swell in the differential pressure power generation system, power is supplied to the plant power load through a flywheel energy storage unit, including:

[0023] In the case of a voltage sag or voltage swell in the differential voltage generation system, the electronic switch is in a fast shutdown state, and the target rated voltage is output through the bidirectional converter of the flywheel energy storage unit to supply power to the factory power load.

[0024] In a possible implementation, when the voltage of the differential pressure power generation system is restored to normal after a voltage sag or voltage swell, the flywheel energy storage unit is charged through a dynamic voltage restorer, and the factory power load is supplied with power through the power grid, including:

[0025] When the differential voltage generation system recovers to normal voltage after voltage sag or voltage swell, the electronic switch is in the on state, charging the flywheel energy storage unit through the bidirectional converter and supplying power to the factory power load through the power grid.

[0026] The embodiments of the present application have the following beneficial effects:

[0027] The system of differential pressure power generation and flywheel energy storage coupling provided in the embodiment of the present application includes: a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system includes a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, and the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein the differential pressure power generation system is used to charge the flywheel energy storage unit when the voltage of the differential pressure power generation system is normal, and supply power to the plant power load through the power grid, and supply power to the plant power load through the flywheel energy storage unit when the voltage of the differential pressure power generation system is temporarily reduced or temporarily increased, and supply power to the plant power load through the power grid when the voltage of the differential pressure power generation system is restored to normal after the voltage is temporarily reduced or temporarily increased, and charge the flywheel energy storage unit through the dynamic voltage restorer, and supply power to the plant power load through the power grid. This scheme realizes that the electricity generated by the expander is stored and taken as it is generated and used by coupling differential pressure power generation and flywheel energy storage technology, and when the voltage of the differential pressure power generation system is abnormal, the voltage stability is ensured by the dynamic voltage recovery system, thereby improving the stability of the differential pressure power generation system in the gas power plant and the efficiency of power utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A framework diagram of a system for coupling differential pressure power generation and flywheel energy storage provided in an embodiment of the present application;

[0029] Figure 2A schematic diagram of the specific structure of a dynamic voltage restorer provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of a circuit under normal voltage provided by an embodiment of the present application;

[0031] Figure 4 A schematic diagram of a circuit under abnormal voltage provided by an embodiment of the present application;

[0032] Figure 5 A schematic diagram of a circuit after voltage recovery provided in an embodiment of the present application;

[0033] Figure 6 A flow chart of the steps of a power generation method for coupling differential pressure power generation and flywheel energy storage provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The singular forms of "a", "said" and "the" used in this application specification and the attached claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items. In the description of the embodiments of the present application, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the embodiments of the present application are for illustrative purposes only and are not intended to be the only implementation method.

[0040] In related technologies, in order to improve the utilization efficiency of natural gas, a natural gas expansion turbine is usually installed between the pipeline network and the gas turbine, so that the high-pressure natural gas can be reduced in pressure through the expansion turbine. While the pressure meets the needs of users, part of the pressure potential energy can be recovered to produce electricity. The electricity produced by the expansion turbine can be directly incorporated into the power system of the gas turbine power plant to drive the auxiliary equipment of the power plant and reduce the power consumption of the plant. However, since gas turbine power plants often have the task of peak load regulation and frequency regulation, the output of the units often needs to be regulated according to the load of the power grid, which causes fluctuations in the required natural gas consumption, affects the stability of the differential pressure power generation output, and cannot be stably incorporated into the power system of the plant, resulting in low utilization of the generated electricity.

[0041] Based on this, the present application provides a system and a power generation method for coupling differential pressure power generation and flywheel energy storage, the system comprising: a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system comprising a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein the differential pressure power generation system is used to charge the flywheel energy storage unit when the voltage of the differential pressure power generation system is normal, and supply power to the plant power load through the power grid, and supply power to the plant power load through the flywheel energy storage unit when the voltage of the differential pressure power generation system is temporarily reduced or temporarily increased, and supply power to the plant power load through the power grid when the voltage of the differential pressure power generation system is restored to normal after the voltage is temporarily reduced or temporarily increased, and charge the flywheel energy storage unit through the dynamic voltage restorer, and supply power to the plant power load through the power grid. This scheme realizes that the electricity generated by the expander is stored and used as it is generated by coupling differential pressure power generation and flywheel energy storage technology, and when the voltage of the differential pressure power generation system is abnormal, the voltage stability is ensured by the dynamic voltage recovery system, thereby improving the stability of the differential pressure power generation system in the gas power plant and the efficiency of power utilization.

[0042] Figure 1 A framework diagram of a system for coupling differential pressure power generation and flywheel energy storage provided in an embodiment of the present application, the system includes a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system includes a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein:

[0043] The differential pressure power generation system is used to charge the flywheel energy storage unit when the voltage of the differential pressure power generation system is normal, and to supply power to the factory power load through the power grid.

[0044] The differential pressure power generation system is also used to supply power to the factory power load through the flywheel energy storage unit when the voltage of the differential pressure power generation system temporarily drops or temporarily increases.

[0045] The differential pressure power generation system is also used to charge the flywheel energy storage unit through a dynamic voltage restorer when the differential pressure power generation system recovers to normal voltage after a voltage sag or voltage swell, and to supply power to the factory power load through the power grid.

[0046] Among them, flywheel energy storage technology uses the kinetic energy of a high-speed rotating body to store energy, and realizes the conversion of electrical energy and kinetic energy by controlling the speed of the flywheel. Compared with other energy storage technologies, it has a higher power density. Its energy storage principle is that the motor works in the motor state, drives the flywheel to accelerate rotation, and converts electrical energy into kinetic energy and stores it. The discharge principle is that the motor works in the generator state, uses the inertia of the high-speed flywheel rotation to drive the rotor to rotate, and converts the kinetic energy stored in the flywheel into electrical energy output through the generator.

[0047] In some optional embodiments, Figure 2 As shown, Figure 2 A schematic diagram of the specific structure of a dynamic voltage restorer provided in an embodiment of the present application. The dynamic voltage restorer includes a switch cabinet 1 and a power cabinet 2, the switch cabinet 1 includes an electronic switch, and the differential pressure power generation system is used to charge the flywheel energy storage unit 3 and supply power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal.

[0048] Among them, QS1, QS2 and QS3 are all called electronic switches. From the functional point of view, QS1 is also called the maintenance switch, QS3 is also called the bypass switch, and QS3 is usually in a normally disconnected state. HSS is an automatic switch control cabinet, which is used to control QS1 to quickly disconnect when the voltage of the differential pressure power generation system is abnormal.

[0049] In some optional embodiments, please continue to refer to Figure 2 The power cabinet 2 includes a bidirectional converter. The differential pressure power generation system is used to charge the flywheel energy storage unit 3 through the bidirectional converter when the voltage of the differential pressure power generation system is normal, and supply power to the factory power load through the power grid.

[0050] The bidirectional converter in the power cabinet 2 is a direct current / alternating current (DC / AC) bidirectional converter, and two intersecting circles with "Y" and "△" symbols represent a three-phase transformer.

[0051] The M / G in the flywheel energy storage unit represents the motor or engine. The flywheel is connected to the left side of the M / G, and the bidirectional converter is also connected to the right side, which can convert DC power into AC power of the target rated voltage.

[0052] When the voltage of the differential pressure power generation system is normal, Figure 3 As shown, Figure 3A circuit diagram under normal voltage provided in an embodiment of the present application. The arrowed line indicates a conducting circuit, at which the HSS is in a normal working state, and the electronic switches QS1 and QS2 are in a conducting state after being closed, so that the flywheel energy storage unit 3 is charged through the bidirectional converter, and the power grid supplies power to the factory power load through the electronic switches QS1 and QS2.

[0053] In some optional embodiments, in the case of a voltage drop or voltage rise in the differential pressure power generation system, as Figure 4 As shown, Figure 4 A circuit diagram under abnormal voltage provided by an embodiment of the present application. The arrowed line indicates a conducting circuit, the HSS is in a fast-off state, indicated by a cross, the HSS controls the electronic switch QS1 to be in a fast-off state, and QS2 is in a conducting state, thereby discharging through the flywheel energy storage unit, and the bidirectional converter of the flywheel energy storage unit outputs the target rated voltage to supply power to the factory power load.

[0054] In some optional embodiments, when the voltage of the differential pressure power generation system is restored to normal after a voltage drop or voltage rise, as Figure 5 As shown, Figure 5 A schematic diagram of a circuit after voltage recovery provided in an embodiment of the present application. The arrowed line indicates a conducting circuit, at which the HSS is in a normal working state, and the electronic switches QS1 and QS2 are in a conducting state after being closed, supplying power to the factory power load through the power grid, and simultaneously charging the flywheel energy storage unit through the bidirectional DC / AC converter.

[0055] The system of differential pressure power generation and flywheel energy storage coupling provided in this embodiment includes: a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system includes a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, and the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein the differential pressure power generation system is used to charge the flywheel energy storage unit when the voltage of the differential pressure power generation system is normal, and supply power to the plant power load through the power grid, and supply power to the plant power load through the flywheel energy storage unit when the voltage of the differential pressure power generation system is temporarily reduced or temporarily increased, and supply power to the plant power load through the power grid when the voltage of the differential pressure power generation system is restored to normal after the voltage is temporarily reduced or temporarily increased, and charge the flywheel energy storage unit through the dynamic voltage restorer, and supply power to the plant power load through the power grid. This scheme realizes that the electricity generated by the expander is stored and used as it is generated by coupling differential pressure power generation and flywheel energy storage technology, and when the voltage of the differential pressure power generation system is abnormal, the voltage stability is ensured by the dynamic voltage recovery system, thereby improving the stability of the differential pressure power generation system in the gas power plant and the efficiency of power utilization.

[0056] like Figure 6 As shown, Figure 6A flow chart of the steps of a power generation method for coupling differential pressure power generation and flywheel energy storage provided in an embodiment of the present application. The method is applied to a system for coupling differential pressure power generation and flywheel energy storage, the system includes a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system includes a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, and the method includes:

[0057] Step 602: When the voltage of the differential pressure power generation system is normal, the flywheel energy storage unit is charged, and power is supplied to the factory power load through the power grid.

[0058] Step 604: When the voltage of the differential pressure power generation system temporarily drops or temporarily increases, the flywheel energy storage unit supplies power to the factory power load.

[0059] Step 606: When the voltage of the differential pressure power generation system recovers to normal after a voltage sag or voltage swell, the flywheel energy storage unit is charged through the dynamic voltage restorer, and the factory power load is supplied with power through the power grid.

[0060] In some optional embodiments, please continue to refer to Figure 2 The dynamic voltage restorer includes a switch cabinet 1 and a power cabinet 2. The switch cabinet 1 includes an electronic switch. The differential voltage generation system is used to charge the flywheel energy storage unit 3 and supply power to the factory power load through the power grid when the voltage of the differential voltage generation system is normal.

[0061] Among them, QS1, QS2 and QS3 are all called electronic switches. From the functional point of view, QS1 is also called the maintenance switch, QS3 is also called the bypass switch, and QS3 is usually in a normally disconnected state. HSS is an automatic switch cabinet, which is used to control QS1 to quickly disconnect when the voltage of the differential pressure power generation system is abnormal.

[0062] In some optional embodiments, please continue to refer to Figure 2 The power cabinet 2 includes a bidirectional converter and a differential pressure power generation system, which is used to charge the flywheel energy storage unit 3 through the bidirectional converter when the voltage of the differential pressure power generation system is normal, and supply power to the factory power load through the power grid.

[0063] The bidirectional converter in the power cabinet 2 is a direct current / alternating current (DC / AC) bidirectional converter, and two intersecting circles with "Y" and "△" symbols represent a three-phase transformer.

[0064] The M / G in the flywheel energy storage unit represents the motor or engine. The flywheel is connected to the left side of the M / G, and the bidirectional converter is also connected to the right side, which can convert DC power into AC power of the target rated voltage.

[0065] If the voltage of the differential pressure power generation system is normal, please continue to refer to Figure 3 , where the line with an arrow represents a conducting circuit. At this time, the HSS is in a normal working state, and the electronic switches QS1 and QS2 are in a conducting state after being closed, so that the flywheel energy storage unit 3 is charged through the bidirectional converter, and the power grid supplies power to the factory power load through the electronic switches QS1 and QS2.

[0066] In some optional embodiments, in the case of a voltage drop or voltage rise in the differential pressure power generation system, please continue to refer to Figure 4 , where the line with an arrow indicates a conducting circuit, the HSS is in a fast-off state, and the HSS controls the electronic switch QS1 to be in a fast-off state. At this time, QS2 is in a conducting state, thereby discharging through the flywheel energy storage unit. The bidirectional converter of the flywheel energy storage unit outputs the target rated voltage to supply power to the factory power load.

[0067] In some optional embodiments, when the voltage of the differential pressure power generation system is restored to normal after a voltage drop or voltage rise, please continue to refer to Figure 5 , where the line with an arrow indicates a conducting circuit. At this time, the HSS is in a normal working state, and the electronic switches QS1 and QS2 are in a conducting state after being closed, supplying power to the factory power load through the grid, and at the same time charging the flywheel energy storage unit through the bidirectional DC / AC converter.

[0068] The power generation method of coupling differential pressure power generation and flywheel energy storage provided in this embodiment includes: when the voltage of the differential pressure power generation system is normal, charging the flywheel energy storage unit and supplying power to the plant power load through the power grid; when the voltage of the differential pressure power generation system is temporarily reduced or temporarily increased, supplying power to the plant power load through the flywheel energy storage unit; when the voltage of the differential pressure power generation system is restored to normal after a temporary voltage reduction or temporary voltage increase, charging the flywheel energy storage unit through a dynamic voltage restorer and supplying power to the plant power load through the power grid. This scheme realizes that the electricity generated by the expander can be stored and used as it is generated by coupling differential pressure power generation and flywheel energy storage technology, and when the voltage of the differential pressure power generation system is abnormal, the voltage stability is ensured by the dynamic voltage recovery system, thereby improving the stability of the differential pressure power generation system in the gas power plant and the efficiency of power utilization.

[0069] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0070] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0071] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A system for coupling differential pressure power generation and flywheel energy storage, characterized in that: The system comprises a differential pressure power generation system and a dynamic voltage recovery system, wherein the dynamic voltage recovery system comprises a flywheel energy storage unit and a dynamic voltage restorer, wherein the differential pressure power generation system is electrically connected to the dynamic voltage recovery system, and the flywheel energy storage unit is electrically connected to the dynamic voltage restorer, wherein: The differential pressure power generation system is used to charge the flywheel energy storage unit and supply power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal; The differential pressure power generation system is further used to supply power to the factory power load through the flywheel energy storage unit in the event of a voltage sag or voltage surge in the differential pressure power generation system; The differential pressure power generation system is also used to charge the flywheel energy storage unit through the dynamic voltage restorer and supply power to the factory power load through the power grid when the voltage of the differential pressure power generation system is restored to normal after a voltage sag or voltage swell.

2. The system according to claim 1, characterized in that The dynamic voltage restorer comprises a switch cabinet and a power cabinet, wherein the switch cabinet comprises an electronic switch, wherein: The differential pressure power generation system is used for charging the flywheel energy storage unit and supplying power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal and the electronic switch is in the on state.

3. The system according to claim 2, characterized in that The power cabinet comprises a bidirectional converter, wherein: The differential pressure power generation system is used for charging the flywheel energy storage unit through the bidirectional converter and supplying power to the factory power load through the power grid when the voltage of the differential pressure power generation system is normal and the electronic switch is in the on state.

4. The system according to claim 2, characterized in that The differential pressure power generation system is also used for the electronic switch to be in a fast shutdown state when the voltage of the differential pressure power generation system temporarily drops or rises, and the bidirectional converter of the flywheel energy storage unit outputs the target rated voltage to supply power to the factory power load.

5. The system according to claim 3, characterized in that The differential pressure power generation system is also used for, when the voltage of the differential pressure power generation system returns to normal after a voltage sag or a voltage swell, the electronic switch is in an on state, the flywheel energy storage unit is charged through the bidirectional converter, and the factory power load is supplied with power through the power grid.

6. A power generation method of coupling differential pressure power generation and flywheel energy storage, characterized in that: A system applied to coupling differential pressure power generation and flywheel energy storage, the system comprising a differential pressure power generation system and a dynamic voltage recovery system, the dynamic voltage recovery system comprising a flywheel energy storage unit and a dynamic voltage restorer, the differential pressure power generation system being electrically connected to the dynamic voltage recovery system, the flywheel energy storage unit being electrically connected to the dynamic voltage restorer, the method comprising: When the voltage of the differential pressure power generation system is normal, charging the flywheel energy storage unit and supplying power to the factory power load through the power grid; In case of a temporary voltage drop or temporary voltage rise of the differential pressure power generation system, the flywheel energy storage unit is used to supply power to the factory power load; When the voltage of the differential pressure power generation system is restored to normal after a voltage sag or voltage surge, the flywheel energy storage unit is charged through the dynamic voltage restorer, and the factory power load is supplied with power through the power grid.

7. The method according to claim 6, characterized in that When the voltage of the differential pressure power generation system is normal, charging the flywheel energy storage unit and supplying power to the factory power load through the power grid includes: When the voltage of the differential pressure power generation system is normal, the electronic switch is in the on state, charging the flywheel energy storage unit and supplying power to the factory power load through the power grid.

8. The method according to claim 7, characterized in that When the voltage of the differential pressure power generation system is normal, charging the flywheel energy storage unit and supplying power to the factory power load through the power grid also includes: When the voltage of the differential pressure power generation system is normal, the electronic switch is in an on state, the flywheel energy storage unit is charged through the bidirectional converter, and the factory power load is supplied with power through the power grid.

9. The method according to claim 7, characterized in that: In the case of a voltage sag or voltage surge in the differential pressure power generation system, supplying power to the factory power load through the flywheel energy storage unit includes: In the case of a voltage sag or voltage surge in the differential pressure power generation system, the electronic switch is in a fast-off state, and the target rated voltage is output through the bidirectional converter of the flywheel energy storage unit to supply power to the factory power load.

10. The method according to claim 7, characterized in that When the voltage of the differential pressure power generation system is restored to normal after a voltage sag or voltage surge, the flywheel energy storage unit is charged by the dynamic voltage restorer, and the factory power load is supplied with power through the power grid, including: When the voltage of the differential pressure power generation system returns to normal after a voltage sag or voltage surge, the electronic switch is in an on state, the flywheel energy storage unit is charged through the bidirectional converter, and the factory power load is supplied with power through the power grid.

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