Flywheel energy storage machine side converter

Abstract

The utility model relates to the technical field of converters, in particular to a flywheel energy storage machine side converter. According to the technical scheme, the power supply comprises a box body and further comprises a DC + input end fixedly installed in the box body, a capacitor pool, a power unit inverter and a reactor are fixedly installed on the two sides of the box body, and an alternating current output end and a DC-input end are fixedly installed in the box body. According to the utility model, the power unit inverter adopts a symmetrical design, the whole machine is simple in structure, double-loop and six-phase balance are realized, the control is simple by issuing an instruction through one controller, the power unit modularization is realized, the replacement is convenient, the capacity expansion is convenient by the design of the capacitor pool, and stable and controllable alternating current can be output; and through a sampling and feedback control mechanism, the system can adjust the operation state in real time, and efficient and stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of converters, in particular to a flywheel energy storage machine side converter. Background Art

[0002] A flywheel energy storage system uses a rotating flywheel to store energy. It stores and releases energy through the conversion of electrical energy into the flywheel's rotational kinetic energy. The flywheel energy storage machine-side converter is a key component of the system, controlling the energy exchange between the flywheel and the grid.

[0003] In existing technologies, megawatt-level energy storage converters face problems such as large footprint, complex circuits, multiple auxiliary equipment, large circulating current and reactive power losses, limited capacity, and safety and stability. Utility Model Content

[0004] The purpose of this utility model is to address the problems mentioned in the background technology, such as large footprint, complex lines, many auxiliary equipment, large circulating current and reactive power losses, limited capacity, and safety and stability. It proposes a flywheel energy storage machine-side converter that improves energy conversion efficiency, breaks through capacity limitations, simplifies the control system, and improves overall safety and reliability, so as to promote the development and application of energy storage technology.

[0005] The technical solution of the utility model is: a flywheel energy storage machine-side converter, including a box body, and also including:

[0006] A DC+ input terminal is fixedly installed in the box, and a capacitor pool, a power unit inverter and an inductor are fixedly installed on both sides of the box. An AC output terminal and a DC- input terminal are fixedly installed in the box. The DC+ input terminal is electrically connected to the capacitor pool, and the capacitor pool located on the same side is electrically connected to the power unit inverter, and the power unit inverter located on the same side is electrically connected to the inductor, and the inductor is electrically connected to the AC output terminal. The DC+ input terminal is electrically connected to the positive pole of the DC power supply, and the DC- input terminal is electrically connected to the negative pole of the DC power supply.

[0007] Optionally, a circuit breaker is fixedly installed in the box, and the circuit breaker is electrically connected to the DC+ input terminal.

[0008] Optionally, a node monitoring system is installed in the box.

[0009] Optionally, the node monitoring system includes a controller and a control loop fixedly mounted on a box, the controller is electrically connected to the control loop, and the controller is electrically connected to a power unit inverter.

[0010] Optionally, the node monitoring system further includes a W1 sampling point, a V1 sampling point, and a U1 sampling point fixedly installed at the connection between the reactor and the AC output terminal.

[0011] Optionally, a cooling system is installed in the box to cool the box.

[0012] Optionally, the cooling system includes an air duct cooling circuit fixedly installed on both sides of the top of the box body, and an exhaust fan is fixedly installed in the air duct cooling circuit.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] The power unit inverter of this utility model adopts a symmetrical design to achieve a simple overall structure, a dual circuit, and achieve six-phase balance. The control is simple by issuing instructions through a controller. The modularization of the power unit makes it easy to replace, and the capacitor pool design makes it easy to expand the capacity.

[0015] Furthermore, through capacitor pool voltage stabilization and current sharing and IGBT inverter technology, the system can output stable and controllable AC power to meet the needs of precise motor control. Through sampling and feedback control mechanism, the system can adjust the operating status in real time to ensure efficient and stable operation of the system.

[0016] In summary, this DC to AC power conversion system achieves precise control of the motor through the coordinated work of multiple components, and maintains high efficiency and stability during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure diagram of the flywheel energy storage machine side converter of the utility model is given Figure 1 ;

[0018] Figure 2 The structure diagram of the flywheel energy storage machine side converter of the utility model is given Figure 2 ;

[0019] Figure 3 This is the electrical schematic diagram of the utility model.

[0020] Figure numerals: 1. Box; 2. DC+ input terminal; 3. Capacitor pool; 4. Power unit inverter; 5. Reactor; 6. AC output terminal; 7. DC- input terminal; 8. Circuit breaker; 9. Controller; 10. Control circuit; 11. Duct cooling circuit; 12. W1 sampling point; 13. V1 sampling point; 14. U1 sampling point. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example

[0023] like Figure 1-3 As shown, the flywheel energy storage machine-side converter proposed by the present invention includes a housing 1, and also includes a DC+ input terminal 2 and a DC- input terminal 7 fixedly installed in the housing 1. The DC+ input terminal 2 is electrically connected to the positive pole of the DC power supply, and the DC- input terminal 7 is electrically connected to the negative pole of the DC power supply. The DC current enters the system through the DC+ input terminal 2 and the DC- input terminal 7. A capacitor pool 3 and a power unit inverter 4 with a reactor 5 are fixedly installed on both sides of the housing 1. The DC+ input terminal 2 is electrically connected to the capacitor pool 3. The DC power first enters the capacitor pool 3. The function of the capacitor pool 3 is to stabilize the voltage and balance the current to ensure the stable operation of the subsequent circuit. The DC power processed by the capacitor pool 3 enters the power unit inverter 4. The IGBT (insulated gate bipolar transistor) in the power unit inverter 4 converts the DC power into controllable AC power. The fast switching capability of the IGBT enables the frequency, phase and amplitude of the output AC power to be precisely controlled.

[0024] Furthermore, capacitor bank 3, located on the same side, is electrically connected to power unit inverter 4. This power unit inverter 4, also located on the same side, is electrically connected to reactor 5. The inverted AC power is output through reactor 5, which smoothes the current waveform, reduces harmonics, and protects the motor and other load devices. An AC output terminal 6 is fixedly mounted within housing 1, and reactor 5 is electrically connected to this terminal. Ultimately, the processed AC power drives the motor through this terminal, achieving precise control of the motor.

[0025] A circuit breaker 8 is fixedly installed in the box 1 and is electrically connected to the DC+ input terminal 2. The circuit breaker 8 is used to prevent circuit overload and short circuit, thereby protecting wires and electrical equipment.

[0026] Furthermore, a node monitoring system is installed within the cabinet 1. A controller 9 and a control circuit 10 are fixedly mounted within the cabinet 1. The controller 9 is electrically connected to the control circuit 10 and to the power unit inverter 4. A W1 sampling point 12, a V1 sampling point 13, and a U1 sampling point 14 are fixedly mounted at the connection between the reactor 5 and the AC output terminal 6. These W1 sampling points 12, V1 sampling points 13, and U1 sampling points 14 are used to collect current and voltage data. The collected data is fed back to the controller 9 via the control circuit 10. After receiving the data, the controller 9 performs complex computations and adjusts system parameters according to a preset control algorithm to achieve controllable adjustment of the entire system.

[0027] The cabinet 1 is equipped with a cooling system. Duct cooling circuits 11 are fixedly mounted on the top of each side of the cabinet 1, and exhaust fans are fixedly installed within these circuits. During system operation, the power unit inverter 4 and reactor 5 generate a large amount of heat. To maintain the system temperature within a normal range, a top-mounted fan exhaust system is used for cooling. The fan duct cooling circuit 11 draws cool air from under the front and rear doors and exhausts hot air from the top of the cabinet, effectively blowing the heat generated by the power unit inverter 4 and reactor 5 out of the cabinet 1.

[0028] The working principle of this embodiment is as follows: direct current enters the system through the DC+ input terminal 2 and the DC- input terminal 7. The direct current first enters the capacitor pool 3, which stabilizes the voltage and balances the current to ensure the stable operation of the subsequent circuit. The direct current processed by the capacitor pool 3 enters the power unit inverter 4, and the IGBT (insulated gate bipolar transistor) in the power unit inverter 4 converts the direct current into controllable alternating current. The fast switching capability of the IGBT enables the frequency, phase and amplitude of the output alternating current to be precisely controlled. The inverted alternating current is output through the inductor 5, which smoothes the current waveform, reduces harmonics, and protects the motor and other load devices. Finally, the processed alternating current drives the motor through the AC output terminal 6 to achieve precise control of the motor.

[0029] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A flywheel energy storage machine-side converter, comprising a box (1), characterized in that: Also includes: A DC+ input terminal (2) is fixedly installed in a box (1), a capacitor pool (3), a power unit inverter (4) and a reactor (5) are fixedly installed on both sides of the box (1), an AC output terminal (6) and a DC- input terminal (7) are fixedly installed in the box (1), the DC+ input terminal (2) is electrically connected to the capacitor pool (3), the capacitor pool (3) located on the same side is electrically connected to the power unit inverter (4), the power unit inverter (4) located on the same side is electrically connected to the reactor (5), the reactor (5) is electrically connected to the AC output terminal (6), the DC+ input terminal (2) is electrically connected to the positive pole of a DC power supply, and the DC- input terminal (7) is electrically connected to the negative pole of the DC power supply.

2. A flywheel energy storage machine-side converter according to claim 1, characterized in that: A circuit breaker (8) is fixedly installed in the box (1), and the circuit breaker (8) is electrically connected to the DC+ input terminal (2).

3. The flywheel energy storage machine-side converter according to claim 1, characterized in that: A node monitoring system is installed in the box (1).

4. A flywheel energy storage machine-side converter according to claim 3, characterized in that: The node monitoring system comprises a controller (9) and a control circuit (10) fixedly mounted on a box (1); the controller (9) is electrically connected to the control circuit (10); and the controller (9) is electrically connected to a power unit inverter (4).

5. A flywheel energy storage machine-side converter according to claim 4, characterized in that: The node monitoring system further comprises a W1 sampling point (12), a V1 sampling point (13) and a U1 sampling point (14) fixedly installed at the connection between the reactor (5) and the AC output terminal (6).

6. A flywheel energy storage machine-side converter according to claim 1, characterized in that: A cooling system is installed in the box (1), and the cooling system cools the box (1).

7. A flywheel energy storage machine-side converter according to claim 6, characterized in that: The cooling system comprises an air duct cooling circuit (11) fixedly mounted on both sides of the top of the box body (1), and an exhaust fan is fixedly mounted in the air duct cooling circuit (11).

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