Electrically excited flywheel energy storage pulse power supply system

Abstract

The utility model belongs to the field of flywheel energy storage equipment, and particularly relates to an electro-magnetic flywheel energy storage pulse power supply system. Three-phase commercial power is connected with a frequency converter, and the frequency converter is connected with a change-over switch; the change-over switch is further connected with the rectifier bridge and the electro-magnetic flywheel energy storage motor, and the change-over switch achieves communication switching between the electro-magnetic flywheel energy storage motor and the frequency converter and between the electro-magnetic flywheel energy storage motor and the rectifier bridge. The rectifier bridge is also connected with a discharge switch; the discharge switch is also connected with a load; the freewheeling branch is inversely connected with the load in parallel; the feedback loop is communicated with the load and the excitation adjusting module; the excitation adjusting module is further connected with a three-phase mains supply, and the excitation adjusting module adjusts the excitation voltage in the electro-magnetic flywheel energy storage motor. The energy storage and discharge functions are integrated, the energy storage density is high, the service life is long, the pulse energy is large, safety and reliability are achieved, and the pulse response speed is high. In addition, the power supply system adopts feedback topology, the discharge voltage and current are controllable, the flexibility is good, the portability is strong, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flywheel energy storage equipment field, concretely relates to a kind of electric excitation flywheel energy storage pulse power system. BACKGROUND

[0002] Pulse power supply can provide high-power energy to load instantaneously. The current specific implementation of pulse power supply mainly has capacitor energy storage, generator energy storage, inductance energy storage and battery energy storage. The main defects of capacitor energy storage are low conversion efficiency and energy storage density. The main defects of generator energy storage are high cost and large size. The commercialization level of inductance energy storage technology is low. The main defects of battery energy storage technology are equipment life and safety performance.

[0003] With the continuous development of pulse power supply technology, different application occasions have put forward higher requirements for the size, power, safety, response speed and applicability of the equipment. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a kind of electric excitation flywheel energy storage pulse power system, to overcome the defects of existing pulse power supply technology.

[0005] The utility model provides a kind of electric excitation flywheel energy storage pulse power system, including frequency converter, switch switch, rectifier bridge, discharge switch, freewheeling branch, load, feedback loop, excitation regulation module and electric excitation flywheel energy storage motor;

[0006] Three-phase mains connects frequency converter, and frequency converter connects switch switch;Switch switch is also connected with rectifier bridge and electric excitation flywheel energy storage motor, and switch switch realizes the communication switching of electric excitation flywheel energy storage motor with frequency converter and rectifier bridge respectively;Rectifier bridge is also connected with discharge switch;Discharge switch is also connected with load;Freewheeling branch is reversely parallel with load;Feedback loop communicates load with excitation regulation module;Excitation regulation module is also connected with three-phase mains, and excitation regulation module adjusts excitation voltage in electric excitation flywheel energy storage motor.

[0007] As further optimization of the utility model, frequency converter uses AC-DC-AC frequency converter, and the rectification side and the inverter side of frequency converter both use fully-controlled devices, and uses voltage stabilizing capacitor between the rectification side and the inverter side.

[0008] As further optimization of the utility model, rectifier bridge uses three-phase uncontrollable rectification circuit, and the switching device of rectifier bridge uses thyristor.

[0009] As further optimization of the utility model, excitation regulation module contains controller and three-phase fully-controlled rectification circuit;Load is connected with controller, and controller is connected with three-phase fully-controlled rectification circuit.

[0010] Compared with the existing pulse power supply technology, the electric excitation flywheel energy storage motor with high power is used, the energy storage and discharge functions are integrated, the energy storage density is high, the service life is long, the pulse energy is large, it is safe and reliable, the pulse response speed is fast.

[0011] Drawings

[0012] Figure 1 is a structural schematic diagram of the embodiment;

[0013] Figure 2 is Figure 1 is a structural schematic diagram of the frequency converter in the embodiment;

[0014] Figure 3 is Figure 1 is a structural schematic diagram of the excitation regulation module in the embodiment;

[0015] Wherein, the frequency converter 1, the switching switch 2, the rectifier bridge 3, the discharge switch 4, the freewheeling branch 5, the load 6, the excitation regulation module 7, the electric excitation flywheel energy storage motor 8, the feedback loop 9, the rectification side 10, the voltage stabilizing capacitor 11, the inverter side 12, the controller 13, the three-phase full-controlled rectification circuit 14. Specific implementation

[0016] As Figures 1-3 shown, the embodiment includes the frequency converter 1, the switching switch 2, the rectifier bridge 3, the discharge switch 4, the freewheeling branch 5, the load 6, the excitation regulation module 7 and the electric excitation flywheel energy storage motor 8.

[0017] The input end of the frequency converter 1 is connected with the output end of the three-phase commercial power, and the output end of the frequency converter 1 is connected with the electric excitation flywheel energy storage motor 8 after the switching switch 2. The three-phase commercial power supplies power to the electric excitation flywheel energy storage motor 8. In the embodiment, the frequency converter 1 adopts an AC-DC-AC frequency converter 1, the rectification side 10 and the inverter side 12 in the frequency converter 1 both adopt full-controlled devices, the voltage stabilizing capacitor 11 is arranged between the rectification side 10 and the inverter side 12, so that the frequency converter 1 has four-quadrant motion function and can realize bidirectional flow of energy.

[0018] The electrically excited flywheel energy storage motor 8 is connected with the rectifier bridge 3 through the switch 2. The switch 2 is used to realize the communication switching of the electrically excited flywheel energy storage motor 8 with the frequency converter 1 and the rectifier bridge 3. The rectifier bridge 3 in the embodiment is a three-phase uncontrolled rectifier circuit, and the switch device is selected as a thyristor, which has the characteristics of large power and high reliability. When the electrically excited flywheel energy storage motor 8 is in the charging stage, the switch 2 connects the stator side of the electrically excited flywheel energy storage motor 8 with the frequency converter 1, and disconnects the stator side of the electrically excited flywheel energy storage motor 8 with the rectifier bridge 3. When the electrically excited flywheel energy storage motor 8 is in the discharging stage, the switch 2 connects the stator side of the electrically excited flywheel energy storage motor 8 with the rectifier bridge 3, and disconnects the stator side of the electrically excited flywheel energy storage motor 8 with the frequency converter 1.

[0019] The rectifier bridge 3 converts the discharge voltage of the electrically excited flywheel energy storage motor 8 into a pulse power. The rectifier bridge 3 is also connected with the discharge switch 4. The discharge switch 4 is also connected with the load 6, and the load 6 is also connected with the excitation regulation module 7, and the excitation regulation module 7 is also connected with the three-phase mains. The freewheeling branch 5 is anti-parallel connected with the load 6.

[0020] The discharge switch 4 controls whether the pulse power discharges to the load 6. When the discharge switch 4 is opened, the pulse power supplies power to the load 6, and provides pulse voltage and pulse current. When the discharge switch 4 is closed, the current of the load 6 flows through the freewheeling branch 5. The freewheeling branch 5 is anti-parallel connected in the circuit of the load 6, and when the discharge switch 4 is closed, the current of the load 6 flows through the freewheeling branch 5.

[0021] The excitation regulation module 7 is used for the excitation voltage of the electrically excited flywheel energy storage motor 8. In the embodiment, the excitation regulation module 7 includes a controller 13 and a three-phase fully controlled rectifier circuit 14. The load 6 is connected with the controller 13, and the controller 13 is connected with the three-phase fully controlled rectifier circuit 14. The voltage and current signals of the load 6 circuit are transmitted to the controller 13 in the excitation regulation module 7 through the feedback loop 9. The controller 13 calculates the trigger signal according to the previously set control law and the current flywheel motor speed and other state signals, and applies the trigger signal to the three-phase fully controlled rectifier circuit 14 to control the size of the excitation voltage.

[0022] The working process of the embodiment is divided into the following two stages:

[0023] The working process of the system is divided into two stages:

[0024] (1) Energy storage motor charging stage

[0025] The switch 2 is actuated, and the stator side of the electrically excited flywheel energy storage motor 8 is connected with the frequency converter 1 and disconnected with the rectifier bridge 3. The frequency converter 1 outputs variable voltage and variable frequency three-phase alternating current, accelerates the electrically excited flywheel energy storage motor 8 from low speed to rated speed, maintains the speed unchanged, and thus converts the electric energy in the power grid into mechanical energy of the electrically excited flywheel energy storage motor 8.

[0026] (2) Energy storage motor discharging stage

[0027] The switching switch 2 is actuated, and the stator side of the electrically excited flywheel energy storage motor 8 is disconnected from the frequency converter 1 and connected to the rectifier bridge 3. The voltage and current signals of the load 6 circuit are transmitted to the controller 13 in the excitation regulation module 7 through the feedback loop 9, the controller 13 calculates the trigger signal according to the previously set pulse power control law and the current state signals such as the rotating speed of the flywheel rotor in the electrically excited flywheel energy storage motor 8, and applies the trigger signal to the three-phase fully-controlled rectifier circuit 14 to control the size of the excitation voltage and in turn control the three-phase voltage output by the stator side. The three-phase voltage supplies power to the load 6 through the switching switch 2, the rectifier bridge 3 and the discharge switch 4.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. An electrically excited flywheel energy storage pulse power system characterized by, The motor comprises a variable frequency converter, a switching switch, a rectifier bridge, a discharge switch, a freewheeling branch, a load, a feedback loop, an excitation adjustment module and an electrically excited flywheel energy storage motor. The three-phase commercial power is connected with the variable frequency converter, and the variable frequency converter is connected with the switching switch; the switching switch is further connected with the rectifier bridge and the electrically excited flywheel energy storage motor, and the switching switch realizes the communication switching of the electrically excited flywheel energy storage motor with the variable frequency converter and the rectifier bridge; the rectifier bridge is further connected with the discharge switch; the discharge switch is further connected with the load; the freewheeling branch is anti-parallel connected with the load; the feedback loop is connected with the load and the excitation adjustment module; the excitation adjustment module is further connected with the three-phase commercial power, and the excitation adjustment module adjusts the excitation voltage in the electrically excited flywheel energy storage motor.

2. An electrically excited flywheel energy storage pulse power system as claimed in claim 1, wherein, The variable frequency converter adopts an AC-DC-AC variable frequency converter, full-controlled devices are used on the rectification side and the inversion side of the variable frequency converter, and a voltage stabilizing capacitor is used between the rectification side and the inversion side.

3. An electrically excited flywheel energy storage pulse power system as claimed in claim 1, wherein, The rectifier bridge adopts a three-phase uncontrolled rectification circuit, and thyristors are used as the switching devices of the rectifier bridge.

4. An electrically excited flywheel energy storage pulse power system as claimed in claim 1, wherein, The excitation adjustment module comprises a controller and a three-phase full-controlled rectification circuit; the load is connected with the controller, and the controller is connected with the three-phase full-controlled rectification circuit.

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