Hybrid energy storage control system based on flywheel energy storage

Abstract

The application provides a flywheel energy storage based hybrid energy storage control system, which comprises a remote device connected with a DCS module and an energy storage controller; the DCS module is connected with the energy storage controller, a unit detection mechanism, a thermal power generating unit module, a rotating speed sensor and an SOC measurement module; the thermal power generating unit module is connected with a first PCS module and a second PCS module through different busbars and transformers, and is also connected with the unit detection mechanism, wherein the busbar linkage mode is a double busbar four-section mode; the first PCS module is connected with a flywheel energy storage module, the second PCS module is connected with a lithium battery energy storage unit, and the first PCS module and the second PCS module are connected with the energy storage controller respectively; the flywheel energy storage module is connected with the rotating speed sensor, and the lithium battery energy storage unit is connected with the SOC measurement module. The system uses two energy storage modes to assist the frequency modulation of the thermal power generating unit, improves the frequency adjustment and frequency modulation effect, and guarantees the power quality of the power grid.

Description

Technical Field

[0001] This application relates to the field of energy storage control technology for power plants, and in particular to a hybrid energy storage control system based on flywheel energy storage. Background Technology

[0002] Currently, with the increasing environmental awareness and the development of new energy technologies, the proportion of new energy power generation is gradually increasing, which in turn poses challenges to the power quality of the power grid. Therefore, in order to ensure the power quality of the power grid and meet the ever-growing electricity demand, the power grid's demand for frequency regulation resources is also increasing.

[0003] Thermal power generation, as one of the main forms of power generation, relies heavily on thermal power generating units for frequency regulation. In related technologies, frequency regulation of thermal power generating units typically relies on the unit's inherent frequency regulation function for automatic regulation. However, this method suffers from low frequency regulation efficiency and poor performance, and in some cases, it cannot guarantee the power quality of the grid. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the purpose of this application is to propose a hybrid energy storage control system based on flywheel energy storage. This hybrid energy storage control system uses both flywheel energy storage and lithium battery energy storage to assist thermal power generating units in frequency regulation, improve the regulation frequency and frequency regulation effect, and ensure the power quality of the power grid.

[0006] To achieve the above objectives, embodiments of this application propose a hybrid energy storage control system based on flywheel energy storage. This system includes: a flywheel energy storage module, a thermal power generator module, a lithium battery energy storage unit, a first energy conversion system (PCS) module, a second energy conversion system (PCS) module, a DCS module, a generator detection mechanism, a speed sensor, a state of charge (SOC) measurement module, an energy storage controller, and a remote control device.

[0007] The first end of the remote control device is connected to the first end of the DCS module, and the second end of the remote control device is connected to the first end of the energy storage controller.

[0008] The second terminal of the DCS module is connected to the second terminal of the energy storage controller, and the third terminal of the DCS module is connected to the first terminal of the unit detection mechanism, the thermal power generator module, the speed sensor and the SOC measurement module respectively.

[0009] The second end of the thermal power generator module is connected to the first end of the first energy conversion system PCS module and the first end of the second energy conversion system PCS module through different busbars and transformers. The third end of the thermal power generator module is connected to the second end of the unit detection mechanism. The busbar connection method is a double busbar four-segment.

[0010] The second end of the first energy conversion system PCS module is connected to the first end of the flywheel energy storage module, the second end of the second energy conversion system PCS module is connected to the first end of the lithium battery energy storage unit, and the third ends of the first energy conversion system PCS module and the second energy conversion system PCS module are respectively connected to the third end of the energy storage controller.

[0011] The second end of the flywheel energy storage module is connected to the second end of the speed sensor, and the second end of the lithium battery energy storage unit is connected to the second end of the SOC measurement module.

[0012] Optionally, in one embodiment of this application, the system further includes: a comparison query module and a fault reporting module, wherein the first end of the comparison query module is connected to the third end of the DCS module, and the second end of the comparison query module is connected to the fault reporting module.

[0013] Optionally, in one embodiment of this application, the unit detection mechanism is used to monitor the operating parameters of the thermal power generator module in real time; the DCS module is used to collect parameter data of the flywheel energy storage module, the thermal power generator module, and the lithium battery energy storage unit, and send the parameter data to the comparison query module; the comparison query module is used to analyze the parameter data, determine whether any abnormality has occurred, and if an abnormality is determined to have occurred, send the abnormality information to the fault reporting module so that the abnormality can be reported for repair through the fault reporting module.

[0014] Optionally, in one embodiment of this application, the flywheel energy storage module and the lithium battery energy storage unit are used to regulate the frequency of the power grid; the energy storage controller is a programmable logic controller (PLC) or a controller of a distributed control system (DCS) module, and the energy storage controller is used to control the output of the flywheel energy storage module and the lithium battery energy storage unit.

[0015] Optionally, in one embodiment of this application, when controlling the output of the flywheel energy storage module and the lithium battery energy storage unit, the energy storage controller further acquires the current grid dispatch demand. When the grid has a frequency regulation demand, the energy storage controller controls the flywheel energy storage module to output power first. If the flywheel energy storage cannot meet the peak power demand, the energy storage controller controls the lithium battery energy storage unit to assist in outputting power. When the grid has a peak shaving demand, the energy storage controller directly controls the output of the lithium battery energy storage unit to maintain the flywheel energy storage module in a non-output state. When the grid has both the peak shaving demand and the frequency regulation demand, the energy storage controller allocates the high-frequency fluctuation demand portion to the flywheel energy storage module output and allocates the medium- and low-frequency fluctuation demand portion to the lithium battery energy storage unit output.

[0016] Optionally, in one embodiment of this application, the thermal power generator module includes: a first generator and a second generator, the first generator being connected to a first segment bus and a third segment bus via corresponding transformers and circuit breakers, and the second generator being connected to a second segment bus and a fourth segment bus via corresponding transformers and relays; the flywheel energy storage module being connected to the first segment bus and the third segment bus, and the lithium battery energy storage unit being connected to the second segment bus and the fourth segment bus; wherein each segment bus is connected to the power grid.

[0017] Optionally, in one embodiment of this application, the first generator is connected to the low-voltage side of the first transformer, and the high-voltage side of the first transformer is connected to the first circuit breaker and the second circuit breaker respectively. The first circuit breaker is connected to the first section busbar, and the second circuit breaker is connected to the third section busbar. The second generator is connected to the low-voltage side of the second transformer, and the high-voltage side of the second transformer is connected to the third circuit breaker and the fourth circuit breaker respectively. The third circuit breaker is connected to the second section busbar, and the fourth circuit breaker is connected to the fourth section busbar.

[0018] Optionally, in one embodiment of this application, the first segment busbar is connected to the power grid via a fifth circuit breaker, the third segment busbar is connected to the power grid via a sixth circuit breaker, the second segment busbar is connected to the power grid via a seventh circuit breaker, and the fourth segment busbar is connected to the power grid via an eighth circuit breaker; the first segment busbar is connected to the second segment busbar via a ninth and a tenth circuit breaker; and the third segment busbar is connected to the fourth segment busbar via an eleventh and a twelfth circuit breaker.

[0019] Optionally, in one embodiment of this application, the first end of the first energy conversion system PCS module is connected to the low-voltage side of the third transformer, the high-voltage side of the third transformer is connected to the thirteenth circuit breaker and the fourteenth circuit breaker respectively, the thirteenth circuit breaker is connected to the first segment bus, and the fourteenth circuit breaker is connected to the third segment bus.

[0020] Optionally, in one embodiment of this application, the first end of the second energy conversion system PCS module is connected to the low-voltage side of the fourth transformer, the high-voltage side of the fourth transformer is connected to the fifteenth circuit breaker and the sixteenth circuit breaker respectively, the fifteenth circuit breaker is connected to the second section bus, and the sixteenth circuit breaker is connected to the fourth section bus.

[0021] The technical solution provided by the embodiments of this application brings at least the following beneficial effects: This application uses a hybrid energy storage method combining flywheel energy storage and lithium battery energy storage to assist in frequency regulation of thermal power generating units. Based on the magnitude of load fluctuations, different energy storage units are used for frequency regulation, thus optimizing the hybrid energy storage frequency regulation method. Specifically, flywheel energy storage is preferentially used for frequency regulation. Leveraging the characteristics of flywheel energy storage, frequency adjustment can be achieved quickly. Compared to using the unit's own functions or lithium-ion batteries alone for frequency regulation, this improves frequency regulation efficiency, reduces frequency regulation costs, and has economic advantages, facilitating practical implementation. During large load fluctuations, the two energy storage methods work together to ensure that the frequency regulation effect meets actual needs and guarantees the power quality of the grid. Furthermore, this application adopts a double-bus, four-section wiring method to ensure that the system can still supply power normally when a part of the system fails, improving the reliability of the grid power supply.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of a hybrid energy storage control system based on flywheel energy storage proposed in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of a specific hybrid energy storage control system based on flywheel energy storage proposed in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram illustrating the connection method of relevant components within a specific hybrid energy storage control system proposed in an embodiment of this application. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] It should be noted that in this embodiment, an energy storage unit is used to assist in frequency regulation of the thermal power generating unit. The energy storage unit includes a flywheel energy storage unit and a lithium-ion battery energy storage unit. Flywheel energy storage refers to an energy storage method that uses an electric motor to drive a flywheel to rotate at high speed, and then uses the flywheel to drive a generator to generate electricity when needed. Flywheel energy storage technology is mostly a power-type energy storage technology, characterized by high energy density, high power density, fast response speed, high cycle life, long service life, high efficiency, and pollution-free recovery. Lithium-ion battery energy storage, on the other hand, is an energy-type energy storage technology, characterized by high energy density, long cycle life, and low self-discharge rate. Therefore, this application adopts a hybrid energy storage approach, prioritizing the use of flywheel energy storage, which enables rapid frequency regulation and is more economical than using lithium-ion batteries alone. During periods of high load fluctuation, the two energy storage methods work together to ensure power quality.

[0029] The following description, with reference to the accompanying drawings, describes a hybrid energy storage control system based on flywheel energy storage proposed in an embodiment of the present invention.

[0030] Figure 1 This is a schematic diagram of a hybrid energy storage control system based on flywheel energy storage proposed in an embodiment of this application, as shown below. Figure 1 As shown, the system includes: a flywheel energy storage module 10, a thermal power generator module 20, a lithium battery energy storage unit 30, a first power conversion system (PCS) module 40, a second power conversion system (PCS) module 50, a distributed control system (DCS) module 60, a generator detection mechanism 70, a speed sensor 80, a state of charge (SOC) measurement module 90, an energy storage controller 100, and a remote control device 110. The connection methods of the above devices are as follows... Figure 1 As shown.

[0031] The first end of the remote control device 110 is connected to the first end of the DCS module 60, and the second end of the remote control device is connected to the first end of the energy storage controller 100.

[0032] It should be noted that the terms "first end" and "second end" in this application are used to distinguish different connection ends of the same device. Each end may include one or more ports, that is, each end can be connected to one or more other devices. The connection method between ends is not limited in this application.

[0033] Specifically, the remote control device 110 is a device that uses communication technology to control remote operating equipment (in this application, the DCS module and energy storage controller in the hybrid energy storage control system, etc.), and can realize various functions such as remote measurement, remote control and remote adjustment.

[0034] In one embodiment of this application, the remote control device 110 is connected to the DCS system of a thermal power plant, receives grid dispatch instructions from an external grid dispatch system, such as Automatic Generation Control (AGC) instructions, and transmits the received AGC instructions to devices such as the DCS module 60 and the energy storage controller 100, so that the hybrid energy storage control system of this application can perform corresponding adjustment operations according to the received dispatch instructions. This allows for frequency regulation control based on the actual needs of the power grid.

[0035] The second end of DCS module 60 is connected to the second end of energy storage controller 100, and the third end of DCS module 60 is connected to the first ends of the following devices: unit detection mechanism 70, thermal power generator module 20, speed sensor 80, and SOC measurement module 90.

[0036] In one embodiment of this application, the DCS module 60 is used to collect parameter data from the flywheel energy storage module 10, the thermal power generator module 20, and the lithium battery energy storage unit 30 connected thereto. The parameter data may include operating data and status data of each device, such as the operating parameters of the thermal power generator module 20 and the rotational speed of the flywheel energy storage module 10.

[0037] The second end of the thermal power generator module 20 is connected to the first end of the first energy conversion system PCS module 40 and the second energy conversion system PCS module 50 through different busbars and transformers. The third end of the thermal power generator module is connected to the second end of the unit detection mechanism 70. The busbar connection method is a double busbar four-section.

[0038] Specifically, the thermal power generator module 20 may include multiple generators. Different generators are connected to the corresponding energy conversion system (PCS) module through different buses and transformers, so that the generator set can be adjusted subsequently through different energy storage units. The bus connection method is a double busbar four-segment busbar, that is, two buses are set up, and each busbar is divided into two segments, for a total of four segments of busbars, which are referred to in this application as the first segment busbar (1M) to the fourth segment busbar (4M).

[0039] In one embodiment of this application, when the thermal power generator module 20 includes two generators, namely the first generator (generator No. 1) and the second generator (generator No. 2), the first generator is connected to the first section bus (1M) and the third section bus (3M) through the corresponding transformer and circuit breaker, and the second generator is connected to the second section bus (2M) and the fourth section bus (4M) through the corresponding transformer and relay.

[0040] Correspondingly, the flywheel energy storage module 10 is connected to the first and third segment buses, and the lithium battery energy storage unit 30 is connected to the second and fourth segment buses, with each segment bus connected to the power grid. This achieves the connection between each energy storage unit and its corresponding generator and the power grid.

[0041] In one embodiment of this application, the unit detection mechanism 70 is used to monitor the operating parameters of the thermal power generating unit module 20 in real time. These operating parameters include various data reflecting the real-time operating status of the unit, such as the unit's rotational speed and output power. The unit detection mechanism 70 transmits the detected operating parameters to the DCS module 60 based on its connection method, facilitating subsequent unit monitoring.

[0042] The second end of the first energy conversion system PCS module 40 is connected to the first end of the flywheel energy storage module 10, the second end of the second energy conversion system PCS module 50 is connected to the first end of the lithium battery energy storage unit 30, and the third ends of the first energy conversion system PCS module 40 and the second energy conversion system PCS module 50 are respectively connected to the third end of the energy storage controller 100.

[0043] The power conversion system (PCS) module is the converter device of the energy storage power station. It connects the energy storage unit to the power grid and can convert electrical energy according to regulation needs. The second end of the first power conversion system PCS module 40 and the second power conversion system PCS module 50 are connected to the corresponding bus, and the first end is connected to the corresponding energy storage unit, thereby realizing the connection between the flywheel energy storage module 10 and the lithium battery energy storage unit 30 and the bus.

[0044] The second end of the flywheel energy storage module 10 is connected to the second end of the speed sensor 80, and the second end of the lithium battery energy storage unit 30 is connected to the second end of the SOC measurement module 90.

[0045] Specifically, the speed sensor 80 is used to measure the rotational speed of the flywheel energy storage module 10, and the SOC measurement module 90 is used to measure the current SOC value of the lithium battery energy storage unit 30. As mentioned above, the speed sensor 80 and the SOC measurement module 90 are also connected to the DCS module 60 to send the collected real-time data to the DCS module 60, so that the DCS module can adjust the frequency modulation mode according to the real-time status of each energy storage unit.

[0046] In one embodiment of this application, a hybrid energy storage system consisting of a flywheel energy storage module 10 and a lithium battery energy storage unit 30 is used to regulate the frequency of the power grid. The specific frequency regulation process is controlled by an energy storage controller 100. In this embodiment, the energy storage controller 100 can be a programmable logic controller (PLC) or a controller of a distributed control system (DCS) module. The energy storage controller 100 is used to control the output of the flywheel energy storage module 10 and the lithium battery energy storage unit 30.

[0047] As one possible implementation, when controlling the output of the flywheel energy storage module 10 and the lithium battery energy storage unit 30, the energy storage controller 100 further acquires the current grid dispatch requirements and controls the energy storage unit according to the different current grid dispatch requirements.

[0048] As a first example, when there is a frequency regulation requirement in the power grid, the energy storage controller 100 controls the flywheel energy storage module 10 to output power first. If the flywheel energy storage cannot meet the peak power demand, the energy storage controller 100 controls the lithium battery energy storage unit 30 to assist in outputting power. Specifically, the flywheel energy storage unit, as a power-type energy storage unit, has high power and is prioritized. The lithium-ion battery energy storage element has low power density and is used as an energy-type energy storage unit. When there is a frequency regulation requirement in the power grid, the flywheel energy storage can output power first. If the flywheel energy storage cannot meet the peak power demand, then the lithium-ion battery energy storage will assist in outputting power.

[0049] As a second example, when there is a peak-shaving demand in the power grid, the energy storage controller 100 directly controls the output of the lithium battery energy storage unit 30 to maintain the flywheel energy storage module in a non-output state. Specifically, when there is a peak-shaving demand in the power grid, the lithium-ion battery energy storage can directly output power, without the need for flywheel energy storage output.

[0050] As a third example, when there are peak-shaving and frequency regulation needs in the power grid, the energy storage controller 100 allocates the high-frequency fluctuation demand to the flywheel energy storage module 10 and allocates the medium- and low-frequency fluctuation demand to the lithium battery energy storage unit 30.

[0051] Therefore, this application adopts two different energy storage methods and uses different energy storage units according to the magnitude of load fluctuations, thereby enabling rapid frequency adjustment.

[0052] Based on the above embodiments, in order to further enrich the functions achievable by the hybrid energy storage control system of this application and facilitate the normal operation of the system, in one embodiment of this application, such as Figure 2 As shown, in Figure 1 Based on the hybrid energy storage control system based on flywheel energy storage shown, the system also includes: a comparison query module 120 and a fault reporting module 130.

[0053] Specifically, the first end of the comparison query module 120 is connected to the third end of the DCS module 60, and the second end of the comparison query module 120 is connected to the fault reporting module 130. Through the comparison query module 120 and the fault reporting module 130, it is possible to detect whether any abnormalities occur during actual system operation and to report any abnormalities.

[0054] In practical applications, after the DCS module 60 collects a series of parameter data from the flywheel energy storage module 10, the thermal power generator module 20, and the lithium battery energy storage unit 30, it sends the parameter data to the comparison and query module 120. The comparison and query module 120 analyzes the received parameter data to determine whether any abnormality has occurred. If an abnormality is determined to be present, the abnormality information is sent to the fault reporting module 130 so that the abnormality can be reported and repaired through the fault reporting module 130.

[0055] For example, the comparison and query module 120 compares real-time data with preset benchmark data under normal operating conditions of each device, and determines whether the error is within the allowable range, thereby detecting whether there are abnormal devices or whether the overall state of the hybrid energy storage control system is abnormal. If an abnormality is detected, the module sends abnormality information, including the name of the abnormal device, the specific abnormal data value, and the preliminarily determined type of abnormality, to the fault reporting module 130, which then reports the abnormality. For instance, the fault reporting module 130 establishes a wireless connection with the mobile terminal device of a pre-verified legitimate worker, sends the abnormality information to the relevant worker's mobile terminal via wireless communication, and reminds the worker to perform timely inspection and repair to eliminate the abnormality promptly.

[0056] In one embodiment of this application, the above-mentioned anomaly detection and repair operations can also be performed by the DCS module 60 to further save hardware costs.

[0057] Based on the above embodiments, to more clearly illustrate the specific implementation method of connecting each energy storage unit to the corresponding PCS module and generator based on bus connection in the hybrid energy storage control system based on flywheel energy storage of this application, in one embodiment of this application, the following is combined with Figure 3 Please provide a detailed explanation.

[0058] like Figure 3 As shown, the system includes: a thermal power generator set (1), a plant busbar (2), a flywheel energy storage section (3), and a lithium battery energy storage section (4). The first generator (1-1) is connected to the low-voltage side of the first transformer (1-2), and the high-voltage side of the first transformer (1-2) is connected to the first circuit breaker (1-3) and the second circuit breaker (1-4). The first circuit breaker (1-3) is connected to the first section busbar, i.e., the 1M plant busbar (2-1), and the second circuit breaker (1-4) is connected to the third section busbar, i.e., the 3M plant busbar (2-3).

[0059] The second generator (1-5) is connected to the low-voltage side of the second transformer (1-6). The high-voltage side of the second transformer (1-6) is connected to the third circuit breaker (1-7) and the fourth circuit breaker (1-8) respectively. The third circuit breaker (1-7) is connected to the second section busbar, namely the 2M plant service busbar (2-2). The fourth circuit breaker (1-8) is connected to the fourth section busbar, namely the 4M plant service busbar (2-4).

[0060] The first section busbar (2-1) is connected to the power grid via the fifth circuit breaker (2-6), the third section busbar (2-3) is connected to the power grid via the sixth circuit breaker (2-5), the second section busbar (2-2) is connected to the power grid via the seventh circuit breaker (2-12), and the fourth section busbar (2-4) is connected to the power grid via the eighth circuit breaker (2-11). The first section busbar (2-1) is also connected to the second section busbar (2-2) via the ninth circuit breaker (2-9) and the tenth circuit breaker (2-10); the third section busbar (2-3) is connected to the fourth section busbar (2-4) via the eleventh circuit breaker (2-7) and the twelfth circuit breaker (2-8).

[0061] Furthermore, the flywheel energy storage module (3-1) is connected to the first energy conversion system PCS module (3-2). The first end of the first energy conversion system PCS module (3-2) is connected to the low-voltage side of the third transformer (3-3). The high-voltage side of the third transformer (3-3) is connected to the thirteenth circuit breaker (3-4) and the fourteenth circuit breaker (3-5) respectively. The thirteenth circuit breaker (3-4) is connected to the first section busbar (2-1), and the fourteenth circuit breaker (3-5) is connected to the third section busbar (2-3).

[0062] The lithium battery energy storage unit (4-1) is connected to the second energy conversion system PCS module (4-2). The first end of the second energy conversion system PCS module (4-2) is connected to the low-voltage side of the fourth transformer (4-3). The high-voltage side of the fourth transformer (4-3) is connected to the fifteenth circuit breaker (4-4) and the sixteenth circuit breaker (4-5) respectively. The fifteenth circuit breaker (4-4) is connected to the second section busbar (2-2), and the sixteenth circuit breaker (4-5) is connected to the fourth section busbar (2-4).

[0063] Therefore, the system adopts a double busbar four-section wiring method to ensure that power can still be supplied normally in the event of a fault in a certain part, thereby improving the reliability of power supply.

[0064] In summary, the hybrid energy storage control system based on flywheel energy storage in this application embodiment assists in frequency regulation of thermal power generating units by employing a hybrid energy storage method combining flywheel energy storage and lithium-ion battery energy storage. It optimizes the hybrid energy storage frequency regulation method by using different energy storage units based on the magnitude of load fluctuations. Specifically, flywheel energy storage is prioritized for frequency regulation, leveraging its characteristics to achieve rapid frequency adjustment. Compared to using the unit's own functions or lithium-ion batteries alone for frequency regulation, this improves regulation efficiency, reduces regulation costs, and offers economic advantages for practical implementation. During periods of large load fluctuations, the two energy storage methods work together to ensure that the frequency regulation effect meets actual needs and guarantees the power quality of the grid. Furthermore, the system adopts a dual-bus, four-section wiring configuration, ensuring that the system can still supply power normally even if a part of the system fails, thus improving the reliability of the power grid.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hybrid energy storage control system based on flywheel energy storage, characterized in that, include: The system includes a flywheel energy storage module, a thermal power generator module, a lithium battery energy storage unit, a first energy conversion system (PCS) module, a second energy conversion system (PCS) module, a DCS module, a generator unit detection mechanism, a speed sensor, a SOC measurement module, an energy storage controller, and a remote control device. The first end of the remote control device is connected to the first end of the DCS module, and the second end of the remote control device is connected to the first end of the energy storage controller. The second terminal of the DCS module is connected to the second terminal of the energy storage controller, and the third terminal of the DCS module is connected to the first terminal of the unit detection mechanism, the thermal power generator module, the speed sensor and the SOC measurement module, respectively. The second end of the thermal power generator module is connected to the first end of the first energy conversion system PCS module and the first end of the second energy conversion system PCS module through different busbars and transformers. The third end of the thermal power generator module is connected to the second end of the unit detection mechanism. The busbar connection method is a double busbar four-segment. The second end of the first energy conversion system PCS module is connected to the first end of the flywheel energy storage module, the second end of the second energy conversion system PCS module is connected to the first end of the lithium battery energy storage unit, and the third ends of the first energy conversion system PCS module and the second energy conversion system PCS module are respectively connected to the third end of the energy storage controller. The second end of the flywheel energy storage module is connected to the second end of the speed sensor, and the second end of the lithium battery energy storage unit is connected to the second end of the SOC measurement module.

2. The hybrid energy storage control system according to claim 1, characterized in that, Also includes: Comparing the query module and the fault reporting module, among which, The first end of the comparison query module is connected to the third end of the DCS module, and the second end of the comparison query module is connected to the fault reporting module.

3. The hybrid energy storage control system according to claim 2, characterized in that, The unit detection mechanism is used to detect the operating parameters of the thermal power generator unit module in real time. The DCS module is used to collect parameter data of the flywheel energy storage module, the thermal power generator module and the lithium battery energy storage unit, and send the parameter data to the comparison query module; The comparison and query module is used to analyze the parameter data, determine whether there is an anomaly, and if an anomaly is determined to be present, send the anomaly information to the fault reporting module so that the anomaly can be reported for repair through the fault reporting module.

4. The hybrid energy storage control system according to claim 1 or 2, characterized in that, The flywheel energy storage module and the lithium battery energy storage unit are used for frequency regulation of the power grid; The energy storage controller is a programmable logic controller (PLC) or a distributed control system (DCS) module controller, and is used to control the output of the flywheel energy storage module and the lithium battery energy storage unit.

5. The hybrid energy storage control system according to claim 4, characterized in that, When controlling the output of the flywheel energy storage module and the lithium battery energy storage unit, the energy storage controller further acquires the current grid dispatch requirements. When the power grid has frequency regulation requirements, the energy storage controller controls the flywheel energy storage module to output power first. If the flywheel energy storage cannot meet the peak power demand, the energy storage controller controls the lithium battery energy storage unit to assist in outputting power. When the power grid has peak-shaving demand, the energy storage controller directly controls the output of the lithium battery energy storage unit to maintain the flywheel energy storage module in a non-output state. When the power grid has the peak-shaving demand and the frequency regulation demand, the energy storage controller allocates the high-frequency fluctuation demand portion to the flywheel energy storage module output, and allocates the medium- and low-frequency fluctuation demand portion to the lithium battery energy storage unit output.

6. The hybrid energy storage control system according to claim 1, characterized in that, The thermal power generator module includes: a first generator and a second generator. The first generator is connected to the first section bus and the third section bus through corresponding transformers and circuit breakers. The second generator is connected to the second section bus and the fourth section bus through corresponding transformers and relays. The flywheel energy storage module is connected to the first segment bus and the third segment bus, and the lithium battery energy storage unit is connected to the second segment bus and the fourth segment bus; wherein each segment bus is connected to the power grid.

7. The hybrid energy storage control system according to claim 6, characterized in that, The first generator is connected to the low-voltage side of the first transformer, and the high-voltage side of the first transformer is connected to the first circuit breaker and the second circuit breaker respectively. The first circuit breaker is connected to the first section busbar, and the second circuit breaker is connected to the third section busbar. The second generator is connected to the low-voltage side of the second transformer, and the high-voltage side of the second transformer is connected to the third circuit breaker and the fourth circuit breaker respectively. The third circuit breaker is connected to the second section busbar, and the fourth circuit breaker is connected to the fourth section busbar.

8. The hybrid energy storage control system according to claim 6, characterized in that, The first section busbar is connected to the power grid through the fifth circuit breaker, the third section busbar is connected to the power grid through the sixth circuit breaker, the second section busbar is connected to the power grid through the seventh circuit breaker, and the fourth section busbar is connected to the power grid through the eighth circuit breaker. The first section busbar is connected to the second section busbar through the ninth and tenth circuit breakers; The third section busbar is connected to the fourth section busbar via the eleventh and twelfth circuit breakers.

9. The hybrid energy storage control system according to claim 6, characterized in that, The first terminal of the first energy conversion system PCS module is connected to the low-voltage side of the third transformer. The high-voltage side of the third transformer is connected to the thirteenth circuit breaker and the fourteenth circuit breaker, respectively. The thirteenth circuit breaker is connected to the first section busbar, and the fourteenth circuit breaker is connected to the third section busbar.

10. The hybrid energy storage control system according to claim 6, characterized in that, The first end of the second energy conversion system PCS module is connected to the low-voltage side of the fourth transformer. The high-voltage side of the fourth transformer is connected to the fifteenth circuit breaker and the sixteenth circuit breaker, respectively. The fifteenth circuit breaker is connected to the second section busbar, and the sixteenth circuit breaker is connected to the fourth section busbar.

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