Compressed air energy storage active-disturbance-rejection grid-connected tracking controller structure

Abstract

The utility model discloses a compressed air energy storage active-disturbance-rejection grid-connected tracking controller structure, which comprises an active-disturbance-rejection measuring assembly, a compressed air energy storage active-disturbance-rejection grid-connected tracking assembly and a controller, wherein the active-disturbance-rejection measuring assembly is used for detecting the power grid voltage and the power grid frequency of a power grid system and outputting tracking signals according to the power grid voltage, the power grid frequency, the terminal voltage of a synchronous motor of a compressed air energy storage system and the rotating speed of the motor; the active-disturbance-rejection measurement assembly is connected with a power grid system; the isolation assembly is arranged between the power grid system and the compressed air energy storage system, the isolation assembly is connected with the active-disturbance-rejection measurement assembly, and the isolation assembly executes disconnection under the condition of grid connection or grid connection abnormity based on the tracking signal; the first communication assembly is established between the active-flex-resistance measurement assembly and the compressed air energy storage system; and the second communication assembly is established between the active-flex-resistance measurement assembly and the power grid system. The state sensing of the power grid system and the compressed air energy storage system can be realized, the safe operation of the power grid is ensured, and the power grid system and the compressed air energy storage system can be dispatched and controlled in a large range.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a structure of a compressed air energy storage self-disruption grid-connected tracking controller. Background Technology

[0002] Compressed air energy storage stores energy in the form of compressed air in an air storage device. When the power system's electricity load reaches its peak, the air storage device releases the stored compressed air, which expands in a turbine expander to do work and drive a generator to generate electricity. It has advantages such as large capacity, high efficiency, long life, and zero emissions, and has great development potential.

[0003] With the increasing integration of compressed air energy storage into wind power consumption, the traditional unidirectional passive distribution network will evolve into an active network with supply and demand interaction. This necessitates unified control and scheduling of all compressed air energy storage systems connected to the grid. Furthermore, the significant nonlinearity of the compressor and expander's operation leads to substantial harmonic hazards, control lag, and a tendency to exacerbate three-phase imbalances in the lines. Power quality issues arising from grid connection may also pose a threat to the distribution network. Existing compressed air energy storage grid connection metering boxes primarily function as meters and lack communication capabilities with grid-connected inverters, thus hindering control over the connected compressed air energy storage. Moreover, during conventional grid voltage and frequency measurements, external interference can easily cause misjudgments regarding the timing of compressed air energy storage grid connection, leading to inrush currents or even cascading failures. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to propose a compressed air energy storage self-disruption grid-connected tracking controller structure, which can realize state awareness of the power grid system and the compressed air energy storage system, ensure the safe operation of the power grid, and enable large-scale dispatch and control of the power grid system and the compressed air energy storage system. It features high economy and strong flexibility.

[0005] The compressed air energy storage self-disruption grid-connected tracking controller structure according to an embodiment of the present utility model includes:

[0006] An active disturbance rejection measurement component is used to detect the grid voltage and grid frequency of the power grid system, as well as the tracking signals output by the generator terminal voltage and motor speed of the synchronous motor of the compressed air energy storage system, the active disturbance rejection measurement component being connected to the power grid system;

[0007] An isolation component is installed between the power grid system and the compressed air energy storage system. The isolation component is connected to the active disturbance rejection measurement component. The isolation component disconnects based on the tracking signal in the event of grid connection failure or grid connection anomaly.

[0008] The communication component includes a first communication component established between the self-resilient measurement component and the compressed air energy storage system, and a second communication component established between the self-resilient measurement component and the power grid system.

[0009] The compressed air energy storage self-rejection grid-connected tracking controller structure of this utility model connects to the power grid system through an self-rejection measurement component. This component can detect the grid voltage and frequency in real time, achieving state awareness of the power grid system. The self-rejection measurement component, through a first communication component, can obtain the terminal voltage and motor speed of the synchronous motor in the compressed air energy storage system, achieving state awareness of the compressed air energy storage system. Furthermore, the self-rejection measurement component can accurately output tracking signals by using grid voltage, grid frequency, terminal voltage, and motor speed, effectively resisting interference during the measurement process. An isolation component, connected to the self-rejection measurement component, can perform smooth grid connection based on the tracking signal and disconnect in case of grid connection anomalies, ensuring the safe operation of the power grid system. Through a second communication component, the tracking signal can be transmitted to the power grid platform, enabling grid dispatchers to perform large-scale dispatch control and rapid connection of load terminals.

[0010] The compressed air energy storage self-disruption grid-connected tracking controller structure of this utility model has the following advantages: Firstly, it can realize the status perception of the power grid system and the compressed air energy storage system; secondly, it can schedule and control the compressed air energy storage system to connect to the power grid system over a large area, ensuring the safe operation of the power grid system; thirdly, it facilitates large-scale scheduling and control by power grid dispatchers, as well as rapid connection of load terminals; in addition, the compressed air energy storage self-disruption grid-connected tracking controller structure of this utility model has the advantages of high economy and high flexibility, and can be widely used in power supply stations.

[0011] In some embodiments, the self-resilient measurement component includes a measurement component and a processor; the measurement component is connected to the power grid system; the processor is connected to both the measurement component and the first communication component to output the tracking signal.

[0012] In some embodiments, the measurement components include a voltage transformer for measuring the grid voltage and a frequency sensor for measuring the grid frequency; both the voltage transformer and the frequency sensor are connected to the grid system.

[0013] In some embodiments, the processor includes a first tracking differentiator that outputs a first control signal from the grid voltage and the generator terminal voltage, a second tracking differentiator that outputs a second control signal from the grid frequency and the motor speed, and an adaptive extended state observer that outputs the tracking signal from the first control signal and the second control signal; the first tracking differentiator is connected to the voltage transformer and the first communication component respectively; the second tracking differentiator is connected to the frequency sensor and the first communication component respectively; and the adaptive extended state observer is connected to the first tracking differentiator and the second tracking differentiator respectively.

[0014] In some embodiments, the isolation component includes a circuit breaker; the circuit breaker performs disconnection based on the tracking signal in the event of a grid connection anomaly.

[0015] In some embodiments, the circuit breaker includes a closing / opening operating mechanism connected to the active disturbance rejection measurement component.

[0016] In some embodiments, the isolation assembly further includes a disconnecting switch connected in series with the circuit breaker, the disconnecting switch being used to manually disconnect the connection between the power grid system and the compressed air energy storage system.

[0017] In some embodiments, the first communication component mainly adopts a Bluetooth communication circuit, and the second communication component mainly adopts an HPLC circuit.

[0018] In some embodiments, the device further includes a housing; the active interference rejection measurement component, the isolation component, the first communication component, and the second communication component are all disposed within the housing, and the housing has an antenna outlet for increasing the communication radiation range of the first communication component.

[0019] In some embodiments, a fan and an operation panel are also included; the fan is disposed on the housing, and the operation panel is fixed to the outside of the housing.

[0020] Additional aspects and advantages of this 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

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of the compressed air energy storage self-disruption grid-connected tracking controller according to an embodiment of the present utility model;

[0023] Figure 2This diagram shows the connection relationships of the components of the self-disruption measurement assembly in the structure of the compressed air energy storage self-disruption grid-connected tracking controller of this utility model embodiment.

[0024] Figure 3 This is a schematic diagram of the structure of the compressed air energy storage self-disruption grid-connected tracking controller according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the operation panel of the compressed air energy storage self-disruption grid-connected tracking controller structure according to an embodiment of this utility model.

[0026] Figure label:

[0027] Self-disturbance rejection measurement component 100; Measurement component 11; Voltage transformer 111; Frequency sensor 112; Processor 12; First tracking differentiator 121; Second tracking differentiator 122; Adaptive extended state observer 123; Isolation component 200; Communication component 300; First communication component 31; Transmitting antenna 311; Second communication component 32; Power grid system 400; Compressed air energy storage system 500; Housing 600; Antenna outlet 60; Cable clip 61; Protective grounding busbar 62; Transparent part 63; Fan 64; Operation panel 65; Wiring hole 66. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] The following is combined with Figures 1 to 4 This describes the structure of the compressed air energy storage self-disruption grid-connected tracking controller according to an embodiment of the present invention.

[0030] like Figure 1 As shown, the compressed air energy storage self-disruption grid-connected tracking controller structure according to an embodiment of the present invention includes a self-disruption measurement component 100, an isolation component 200, and a communication component 300.

[0031] The active disturbance rejection measurement component 100 is used to detect the grid voltage and grid frequency of the power grid system 400, as well as the output tracking signal of the synchronous motor terminal voltage and motor speed of the compressed air energy storage system 500. The active disturbance rejection measurement component 100 is connected to the power grid system 400.

[0032] The isolation component 200 is an isolation component installed between the power grid system 400 and the compressed air energy storage system 500. The isolation component 200 is connected to the active disturbance rejection measurement component 100. The isolation component 200 disconnects based on the tracking signal grid connection or in the event of grid connection abnormality.

[0033] The communication component 300 includes a first communication component 31 established between the self-resilient measurement component 11 and the compressed air energy storage system 500, and a second communication component 32 established between the self-resilient measurement component 11 and the power grid system 400.

[0034] The compressed air energy storage self-rejection grid-connected tracking controller structure of this utility model embodiment is connected to the power grid system 400 through the self-rejection measurement component 100. It can detect the grid voltage and frequency of the power grid system 400 in real time, achieving state awareness of the power grid system 400. The self-rejection measurement component 11, through the first communication component 31, can obtain the terminal voltage and motor speed of the synchronous motor of the compressed air energy storage system 500, achieving state awareness of the compressed air energy storage system. Furthermore, the self-rejection measurement component 11 can accurately output tracking signals by measuring grid voltage, grid frequency, terminal voltage, and motor speed, effectively resisting interference during the measurement process. The isolation component 200, connected to the self-rejection measurement component 100, can perform smooth grid connection based on the tracking signal and disconnect in case of grid connection anomalies, ensuring the safe operation of the power grid system 400. Through the second communication component 32, the tracking signal can be transmitted to the power grid platform of the power grid system 400, enabling grid dispatchers to perform large-scale dispatch control and rapid connection of load terminals.

[0035] The compressed air energy storage self-interference rejection grid-connected tracking controller structure of this utility model embodiment has the following advantages: on the one hand, it can realize the status perception of the power grid system 400 and the compressed air energy storage system 500; on the other hand, it can schedule and control the compressed air energy storage system 500 to connect to the power grid system 400 over a large range, ensuring the safe operation of the power grid system 400; furthermore, it facilitates large-scale scheduling and control by power grid dispatchers, as well as rapid connection of load terminals; in addition, the compressed air energy storage self-interference rejection grid-connected tracking controller structure of this utility model embodiment has the advantages of high economy and strong flexibility, and can be widely used in power supply stations.

[0036] In some embodiments, such as Figure 1 and Figure 2 As shown, the self-resilient measurement component 100 includes a measurement component 11 and a processor 12; the measurement component 11 is connected to the power grid system 400; the processor 12 is connected to the measurement component 11 and the first communication component 31 respectively to output a tracking signal.

[0037] Specifically, the measurement component 11 includes a voltage transformer 111 for measuring grid voltage and a frequency sensor 112 for measuring grid frequency; wherein, both the voltage transformer 111 and the frequency sensor 112 are connected to the grid system 400; wherein, the voltage transformer 11 can measure grid voltage and the frequency sensor 112 can measure grid frequency. The processor 12 includes a first tracking differentiator 121 that outputs a first control signal from the grid voltage and the generator terminal voltage, a second tracking differentiator 122 that outputs a second control signal from the grid frequency and the motor speed, and an adaptive extended state observer 123 that outputs a tracking signal from the first control signal and the second control signal. The first tracking differentiator 121 is connected to a voltage transformer 111 and a first communication component 31, respectively, and can receive the grid voltage and the generator terminal voltage, and output the first control signal. The second tracking differentiator 122 is connected to a frequency sensor 112 and the first communication component 31, respectively, and can receive the grid frequency and the motor speed, and output the second control signal. The adaptive extended state observer 123 is connected to both the first tracking differentiator 121 and the second tracking differentiator 122, respectively, and can receive the first control signal and the second control signal, and output the tracking signal.

[0038] The hardware structure of the self-resisting measurement component is illustrated below with a specific example. The first tracking differentiator 121 takes the grid voltage and the motor terminal voltage as inputs and outputs a first control signal, which is the control current i1. The second tracking differentiator 122 takes the grid frequency and the motor speed as inputs and outputs a second control signal, which is the control current i2. The adaptive extended state observer 123 takes the control quantities i1 and i2 as inputs and its own three adjustable parameters α1, α2, and α3 as inputs. 3、 The output is the tracking signal x.

[0039] In the off-grid state, when the phase sequence and phase of the synchronous motor and the power grid system 400 are consistent, and x is less than the given threshold x1, a grid connection permission command is given; in the grid-connected state, if x is greater than the given threshold x2, a circuit breaker command is issued, and the isolation component 200 responds by tripping, disconnecting the connection between the power grid system 400 and the compressed air energy storage system 500.

[0040] By constructing an adaptive extended state observer 123, the disturbances of the power grid system 400 and the compressed air energy storage system 500 during power grid voltage and frequency measurements can be automatically compensated. This enables the three parameters α1, α2, and α3 of the adaptive extended state observer 123 to be automatically adjusted online according to the disturbance changes, thereby increasing the estimation and compensation accuracy of the adaptive extended state observer 123 for disturbances and improving the control performance of the active disturbance rejection grid-connected tracking controller.

[0041] In some embodiments, the isolation component 200 includes a circuit breaker; the circuit breaker performs disconnection based on a tracking signal in the event of a grid connection anomaly.

[0042] Specifically, the circuit breaker is equipped with a closing and opening operation mechanism, which is connected to the active disturbance rejection measurement module 100. Based on the tracking signal of the active disturbance rejection measurement module, it automatically disconnects the connection between the power grid system 400 and the compressed air energy storage system 500 in a timely manner when an abnormality occurs in the grid connection state, thereby achieving local protection.

[0043] In some embodiments, the isolation component 200 further includes a disconnecting switch connected in series with a circuit breaker. The disconnecting switch is used to manually disconnect the connection between the power grid system 400 and the compressed air energy storage system 500. By setting up the disconnecting switch, it is convenient for operators to perform safe maintenance. For example, when maintenance is required on the power grid system 400, by disconnecting the disconnecting switch, operators can easily perform maintenance on the power grid system 400 while ensuring that the compressed air energy storage system 500 itself remains operational. Similarly, when maintenance is required on the compressed air energy storage system 500, by disconnecting the disconnecting switch, operators can easily perform maintenance on the compressed air energy storage system 500 without affecting the normal operation of the power grid system 400.

[0044] In some embodiments, the first communication component 31 mainly adopts a Bluetooth communication circuit. The Bluetooth communication circuit can realize short-range wireless communication between the active interference rejection measurement component 100 and the compressed air energy storage system 500. To ensure the signal transmission and reception distance, the Bluetooth communication circuit is equipped with a transmitting antenna 311 (e.g., ...). Figure 3 As shown, it can establish wireless communication with key equipment such as compressors and gas storage tanks. The Bluetooth communication circuit can record key parameters such as terminal voltage, motor speed, and gas storage pressure. The second communication component 32 mainly adopts the HPLC circuit. The HPLC circuit uses orthogonal frequency division multiplexing technology to realize high-speed carrier communication on low-voltage power lines. It can realize remote wired communication between the self-interference rejection measurement component 100 and the power grid platform of the power grid system 400, record fault parameters, grid connection and tripping records, and establish a rapid connection with power grid dispatchers and load terminals.

[0045] In some embodiments, such as Figure 3As shown, the system also includes a housing 600. The active interference rejection measurement component 100, isolation component 200, first communication component 31, and second communication component 32 are all housed within the housing 600. The housing 600 integrates various functional components such as the active interference rejection measurement component 100, isolation component 200, first communication component 31, and second communication component 32, making it more convenient to use. The housing 600 has an antenna outlet 60 to increase the communication radiation range of the first communication component 31. For example, if the first communication component 31 uses a Bluetooth communication circuit, and to ensure signal transmission and reception distance, the Bluetooth communication circuit is equipped with a transmitting antenna 311, the communication radiation range of the Bluetooth communication circuit can be increased by opening an antenna outlet 60 at the top of the housing 600. The bottom of the housing 600 has a wiring perforation 66 for wiring to pass through.

[0046] In some embodiments, the enclosure 600 is equipped with cable clips 61 and a protective grounding busbar 62; the cable clips 61 are used to fix the internal wiring and prevent messy wiring from causing troubleshooting difficulties and electromagnetic interference; the protective grounding busbar 62 is mainly used to ground the metal enclosure 600 to prevent electric shock accidents to workers.

[0047] In some embodiments, such as Figure 3 and Figure 4 As shown, it also includes a fan 64 and an operation panel 65; the fan 64 is installed inside the enclosure 600 and is used for heat dissipation of the internal functional components of the enclosure 600, and also plays a role in ventilation; the operation panel 65 is fixed to the wall of the enclosure 600 and can interact with the user in real time. The operation panel 65 has a display screen on top, which can display key information such as the grid connection status of the device in real time, and buttons on the bottom, which the user can use to realize emergency tripping or set system parameters such as control thresholds in real time.

[0048] In some embodiments, such as Figure 3 As shown, the enclosure 600 is provided with a transparent part 63, which can be made of tempered glass, so that the internal fault condition of the enclosure 600 can be observed from the outside in a timely manner, while ensuring a certain mechanical strength.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A structure for a compressed air energy storage self-disruption grid-connected tracking controller, characterized in that, include: An active disturbance rejection measurement component is used to detect the grid voltage and grid frequency of the power grid system, as well as the tracking signals output by the generator terminal voltage and motor speed of the synchronous motor of the compressed air energy storage system, the active disturbance rejection measurement component being connected to the power grid system; An isolation component is installed between the power grid system and the compressed air energy storage system. The isolation component is connected to the active disturbance rejection measurement component. The isolation component disconnects based on the tracking signal in the event of grid connection failure or grid connection anomaly. The communication component includes a first communication component established between the self-resilient measurement component and the compressed air energy storage system, and a second communication component established between the self-resilient measurement component and the power grid system.

2. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 1, characterized in that, The self-resilient measurement component includes a measurement component and a processor; the measurement component is connected to the power grid system; the processor is connected to both the measurement component and the first communication component to output the tracking signal.

3. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 2, characterized in that, The measurement components include a voltage transformer for measuring the grid voltage and a frequency sensor for measuring the grid frequency; both the voltage transformer and the frequency sensor are connected to the grid system.

4. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 3, characterized in that, The processor includes a first tracking differentiator that outputs a first control signal from the grid voltage and the generator terminal voltage, a second tracking differentiator that outputs a second control signal from the grid frequency and the motor speed, and an adaptive extended state observer that outputs the tracking signal from the first control signal and the second control signal; the first tracking differentiator is connected to the voltage transformer and the first communication component respectively; the second tracking differentiator is connected to the frequency sensor and the first communication component respectively; and the adaptive extended state observer is connected to the first tracking differentiator and the second tracking differentiator respectively.

5. The compressed air energy storage self-disruption grid-connected tracking controller structure according to any one of claims 1-4, characterized in that, The isolation component includes a circuit breaker; the circuit breaker disconnects in the event of a grid connection anomaly based on the tracking signal.

6. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 5, characterized in that, The circuit breaker is equipped with a closing and opening operation mechanism, which is connected to the active disturbance rejection measurement component.

7. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 5, characterized in that, The isolation assembly also includes a disconnecting switch connected in series with the circuit breaker. The disconnecting switch is used to manually disconnect the connection between the power grid system and the compressed air energy storage system.

8. The compressed air energy storage self-disruption grid-connected tracking controller structure according to any one of claims 1-4, characterized in that, The first communication component mainly uses a Bluetooth communication circuit, and the second communication component mainly uses an HPLC circuit.

9. The compressed air energy storage self-disruption grid-connected tracking controller structure according to any one of claims 1-4, characterized in that, It also includes a housing; the self-interference rejection measurement component, the isolation component, the first communication component and the second communication component are all disposed in the housing, and the housing has an antenna outlet for increasing the communication radiation range of the first communication component.

10. The compressed air energy storage self-disruption grid-connected tracking controller structure according to claim 9, characterized in that, It also includes a fan and an operation panel; the fan is mounted on the housing, and the operation panel is fixed to the outside of the housing.

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