TWM522501U - Driving circuit with damping function and flywheel energy storage system - Google Patents

Description

Drive circuit with damping function and flywheel energy storage system

The invention relates to a driving circuit, in particular to a driving circuit with a damping function for driving a flywheel energy storage device and a flywheel energy storage system with a damping function having the driving circuit.

Referring to FIG. 1 , the conventional flywheel energy storage system (FES) mainly includes a flywheel energy storage device 100 and a driving circuit 200. The flywheel energy storage device 100 mainly includes a motor 1 (both an electric motor and a generator) and a flywheel 2, wherein a stator (not shown) of the motor 1 is wound with three-phase coils R, S, and T as shown in FIG. The three-phase coils R, S, and T are connected to each other to form a Y-shaped winding having three contacts U, V, and W. And as shown in FIG. 3, the driving circuit 200 receives the DC power supply of the DC power source and is used to drive the motor 1 to operate. It has three bridge arms 21, 22, 23 connected in parallel with the DC power source Vdc, and the bridge arms 31, 32, 33 Correspondingly, the contacts U, V, and W of the three-phase coils R, S, and T are electrically coupled to control the DC power supply Vdc to energize the three-phase coils R, S, and T, and the drive motor 1 is driven by the motor type to drive The flywheel 2 accelerates rotation and stores energy (electric energy to mechanical energy). When the DC power supply Vdc stops supplying power, the flywheel 2 will decelerate and drive the motor 1 to operate in the generator type to generate electric power output (mechanical energy to electric energy).

In addition, when the driving circuit 200 drives the motor 1 to operate (motor type), and controls the three-phase coils R, S, T, two phases of which are alternately connected with the DC power source Vdc, for example, as shown in FIG. 2, the coils R, S and the DC power source Vdc Guided and excited, the rotor (not shown) of the drive motor 1 drives the flywheel 2 to rotate, and then the drive circuit 200 causes the DC power supply Vdc to not be connected to the coils R, S, and then replaces the coils S, T and the DC power supply. Vdc is guided to excite the coils S and T. At this time, as shown in FIG. 4, the coils R and S will generate back electromotive forces e1 and e2 due to the instantaneous non-conduction. Therefore, in order to prevent the counter electromotive forces e1 and e2 from directly impacting the DC power source Vdc, a snubber capacitor (damping capacitor) Cd connected in parallel with the DC power source Vdc is generally provided in the driving circuit 200, so that the counter electromotive forces e1 and e2 can pass through the driving circuit 200. The flywheel diode D of the upper switch U+, V+, W+, and the lower switch U-, V-, W- is temporarily stored in the snubber capacitor Cd.

However, the counter electromotive forces e1 and e2 charge the snubber capacitor Cd via the drive circuit 200, which not only causes the drive circuit 200 to heat up, but also because the voltages of the counter electromotive forces e1 and e2 are generally higher than the voltage of the DC power source Vcd, blocking the DC power source Vcd from entering the drive circuit. 200, the drive circuit 200 is heated by the DC power supply Vcd colliding with the counter electromotive forces e1, e2. Therefore, in order to prevent the drive circuit 200 from being damaged due to excessive temperature, the conventional flywheel energy storage system usually needs to provide a cooling system (not shown) to dissipate the drive circuit 200.

Therefore, the purpose of the present invention is to provide a driving circuit with a damping function for driving a flywheel energy storage device and having both power saving and high efficiency, and a flywheel energy storage system having a damping function with the driving circuit.

Therefore, the novel driving circuit with damping function receives power from a DC power source to drive a flywheel energy storage device, and the flywheel energy storage device includes a motor as a motor and a generator and a flywheel driven by the motor, wherein the flywheel The motor has a stator, the stator is provided with a three-phase coil, and the three-phase coils are connected to each other to form a Y-shaped winding having a neutral point and three contacts; the driving circuit comprises: three bridges connected in parallel with the DC power source An arm, each of the bridge arms has an upper switch and a lower switch connected in series with a first contact, and two flywheel diodes respectively corresponding to the upper switch and the lower switch and connected in anti-parallel, the upper switch One end is electrically coupled to a positive end of the DC power source, and one end of the lower switch is electrically coupled to a negative end of the DC power source, and the contact of each phase coil corresponds to the first contact of each bridge arm Electrically coupled; three flywheel diode sets in parallel with the DC power supply, each flywheel diode set has a first flywheel diode and a second flywheel diode connected in series with a second contact And each phase line The contact of the circle is electrically coupled to the second contact of each flywheel diode set; two first DC support capacitors are connected in parallel with the DC power supply; and two second DC support capacitors are provided at one end The third terminal is electrically coupled to the two ends of the DC power supply, and the third contact is electrically coupled to the neutral point of the three-phase coil.

In one embodiment, the first DC support capacitors are a polar capacitor, and the second DC support capacitors are a non-polar high frequency capacitors, and the two together form a damping capacitor.

In an embodiment, the driving circuit further includes a damping battery connected in parallel with the DC power source and capable of being repeatedly charged and discharged, and the second DC The supporting capacitor discharges the damping battery and stores the electrical energy in the damping battery.

In an embodiment, the damping battery is a capacitor battery or an acid-base resonance battery.

In addition, the flywheel energy storage system with damping function of the present invention includes the above-described flywheel energy storage device and the drive circuit.

The novel regulates the DC voltage by the first DC supporting capacitor of the driving circuit, so that the motor is not affected by the voltage fluctuation of the DC voltage, and the flywheel diode group and the second DC supporting capacitor are The design makes the back electromotive force generated by the three-phase coil not directly affect the DC power supply, and will not be discharged through the bridge arm of the drive circuit, and will not conflict with the DC power supply of the input bridge arm, so the bridge arm will not heat up and heat up. The back electromotive force generated by the three-phase coil is converted into DC power through the second DC support capacitor, and the power can be preferentially supplied to the driven motor, thereby increasing the endurance of the DC power source, and achieving the energy saving and high efficiency of the driving circuit. The efficacy and purpose.

300‧‧‧ drive circuit

21-23‧‧‧Bridge arm

24-26‧‧‧Flywheel diode group

27‧‧‧ third joint

211, 221, 231‧‧‧ first contact

241, 251, 261‧‧‧ second joint

C1‧‧‧First Support Capacitor

C2, C3‧‧‧ second supporting capacitor

U+, V+, W+‧‧‧ switch

U-, V-, W-‧‧‧ switch

D‧‧‧Flywheel diode

D1‧‧‧First flywheel diode

D2‧‧‧Second flywheel diode

U, V, W‧‧‧ contacts

Np‧‧‧Neutral point

R, S, T‧‧‧ coil

E1, e2‧‧‧ counter electromotive force

Db‧‧‧damped battery

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a circuit block diagram of a conventional flywheel energy storage system; FIG. 2 is a motor use of a conventional flywheel energy storage system. Schematic diagram of a three-phase coil winding; FIG. 3 is a driving circuit diagram of a conventional flywheel energy storage system; FIG. 4 is a schematic diagram of a counter-electromotive force generated on a two-phase coil of a three-phase coil; 5 is a driving circuit diagram of an embodiment of a flywheel energy storage system with a damping function; FIG. 6 is a schematic diagram of a three-phase coil of the motor in which the two-phase coil is excited; FIG. 7 illustrates the motor in the embodiment. The discharge path of the counter electromotive force generated on the two coils R, S; and FIG. 8 illustrates the discharge path of the counter electromotive force generated on the two coils R, S of the motor in the present embodiment and its equivalent circuit diagram.

An embodiment of the novel flywheel energy storage system with damping function mainly includes a flywheel energy storage device (FES) 100 as shown in FIG. 1 and a driving circuit for driving the flywheel energy storage device 100. 300, as shown in Figure 5. As shown in FIG. 1 , the flywheel energy storage device 100 mainly includes a motor 1 that is both an electric motor and a generator, and a flywheel 2 that is driven by a motor (motor) 1. The structure of the motor 1 is similar to a motor, and has a stator and a stator. a rotor (not shown), and the stator is provided with three-phase coils R, S, T as shown in FIG. 6, and the three-phase coils R, S, T are connected to each other to form a neutral point Np and three Y-wound of contacts U, V, W.

As shown in FIG. 5, the driving circuit 300 includes three bridge arms 21, 22, and 23 connected in parallel with the DC power source Vdc, and three flywheel diode groups 24, 25, and 26 connected in parallel with the DC power source Vdc. The DC power supply Vdc is connected in parallel with the first DC support capacitor C1 and the two second DC support capacitors C2 and C3. Each of the bridge arms 21, 22, 23 has a first contact connected in series 211, 221, 231 an upper switch U+, V+, W+ and a lower switch U-, V-, W-, and two separate and the upper switch U+, V+, W+ and the lower switch U-, V-, W-corresponding and anti-parallel flywheel diode D, and one end of the upper switches U+, V+, W+ is electrically coupled to a positive terminal of the DC power source Vdc, and the lower switches U-, V-, W- One end is electrically coupled to a negative terminal of the DC power source Vdc, and the contacts U, V, W of each phase coil R, S, T and the first contacts 211, 221 of each of the bridge arms 21, 22, 23, 231 corresponds to electrical coupling.

Each flywheel diode set 24, 25, 26 has a first flywheel diode D1 and a second flywheel diode D2 connected in series with a second contact 241, 251, 261, and each phase coil The contacts U, V, W of R, S, T are electrically coupled to the second contacts 241, 251, 261 of each flywheel diode set 24, 25, 26.

One ends of the two second DC supporting capacitors C2 and C3 are connected in series to a third contact 27, and the other end is electrically coupled to both ends of the DC power supply Vdc, and the third contact 27 and the three-phase coil are respectively coupled. The neutral point Np of R, S, T is electrically coupled. Moreover, the first and second DC supporting capacitors C1, C2, and C3 are film capacitors, and the capacitance values of the second DC supporting capacitors C2 and C3 are the same, and the first DC supporting capacitor C1 and the second DC supporting capacitor C2 and C3 are the same. The capacitance values can be the same or different. It is worth mentioning that, in this embodiment, the first DC support capacitor C1 is a polar capacitor (however, it has no polarity limitation), and the second DC support capacitors C2 and C3 are non-polar. a high frequency (or intermediate frequency) capacitor, and the first DC support capacitor C1 and the second DC support capacitor C2, C3 together form a damper capacitor, and the damper capacitor For the details and details, please refer to Taiwan's M477033 "Capacitor for Damping Function in System Circuits" patent.

In addition, the embodiment further includes a damping battery Db connected in parallel with the DC power source Vdc, which is a rechargeable battery that can be repeatedly charged and discharged and has a damping function, such as a capacitor battery or an acid-base resonance battery.

Thereby, when the driving circuit 300 controls the contacts U, V, the contacts V, W, the contacts W, U of the three-phase coils R, S, T to be electrically coupled with the DC power source Vdc, by rotating the three phases Two of the coils of the coils R, S, and T are excited, and the driving motor 1 is operated by the motor type, and drives the flywheel 2 to accelerate the rotation to store energy (converts electrical energy into mechanical energy), and at the same time, the first DC supporting capacitor C1 can be stabilized. The output voltage of the DC power source Vdc is such that its voltage fluctuation is maintained within an allowable range and can be stably supplied to the motor 1.

Furthermore, when the motor 1 is operated in the motor type, for example, as shown in FIGS. 5 and 6, the drive circuit 300 transmits the upper switch U+ of the bridge arm 21 and the lower switch V-guide coils R, S of the bridge arm 22 and the DC power supply. At Vdc, the coils R, S will be excited to drive the rotor of the motor 1 to rotate relative to the stator. Next, the drive circuit 300 causes the DC power source Vdc to be non-conductive to the coils R and S, and the coils S and T are connected to the DC power source Vdc to excite the coils S and T. At this time, as shown in FIG. 7 and FIG. 8, the coils R and S will generate back electromotive forces e1 and e2 due to the instantaneous non-conduction, wherein the counter electromotive force e1 on the coil R will follow the neutral point Np and the second supporting capacitor. C3, the discharge circuit (the shortest path) formed by the second flywheel diode D2 of the flywheel diode group 24, discharges the second supporting capacitor C3, and the counter electromotive force e2 on the coil S will follow the flywheel diode 25 The first flywheel diode D1, the second supporting capacitor C2, and the neutral point Np constitute The discharge circuit (the shortest path) discharges the second supporting capacitor C2. Therefore, the second supporting capacitors C2 and C3 respectively receive the back electromotive force e2 and e1 of the alternating current, and convert the counter electromotive forces e2 and e1 into direct current electric energy to generate a damping effect (ie, alternating current to direct current to completely absorb the counter electromotive force e2). E1, with maximum power transfer), and then the second supporting capacitors C2, C3 release the electric energy to the damping battery Db (that is, charge the damping battery Db), so that the counter electromotive forces e2, e1 are recovered and stored in the damping battery Db in the form of direct current. .

Similarly, when the coils S and T are excited, when the state is changed from the direct current source Vdc to the non-conducting state, the counter electromotive force generated instantaneously on the coils S and T will also pass through the corresponding flywheel diode in the above manner. The group discharges the second supporting capacitors C2 and C3, and then releases the electric energy to the damping battery Db by the second supporting capacitors C2 and C3 (that is, charges the damping battery Db), and recovers the counter electromotive force generated instantaneously on the coils S and T. Damping battery Db. Therefore, in addition to avoiding the high-voltage counter electromotive force instantaneously generated by the three-phase coils R, S, and T, directly impacting the DC power source V _DC , the counter electromotive force generated on the three-phase coils R, S, and T is passed through the flywheel diode group. 24, 25, 26 are recycled to the second supporting capacitors C2, C3, and then stored in the damping battery Db, so that the counter electromotive force does not flow through the bridge arms 21, 22, 23 of the driving circuit 300 (the flywheels of the upper and lower switches The pole body D) causes the bridge arms 21, 22, 23 of the drive circuit 300 not to heat up due to the counter electromotive force, and also prevents the back electromotive force from being output by the bridge arms 21, 22, 23 and the input bridge arms 21, 22, 23 The DC power supply Vdc collides, causing the power to endlessly heat up and cause the drive circuit 300 to heat up.

Moreover, the back electromotive force stored in the damping battery Db is recovered ( The voltage) is generally higher in potential than the DC power source Vdc, so the damping battery Db can preferentially supply power to the motor 1 driven by the driving circuit 300, and increase the endurance of the DC power source Vdc, and the driving circuit 300 has the effect of saving energy and power.

Therefore, the driving circuit 300 of the above embodiment stabilizes the DC voltage Vdc by the first DC supporting capacitor C1, so that the motor 1 is not affected by the voltage fluctuation of the DC voltage Vdc, and by the flywheel diode The body groups 24, 25, 26 and the second DC supporting capacitors C2, C3 are designed such that the counter electromotive force generated by the three-phase coils R, S, T does not directly affect the DC power source V _DC and does not flow through the driving circuit 300. The bridge arms 21, 22, and 23 do not collide with the DC power source Vdc of the input bridge arms 21, 22, and 23, so that the bridge arms 21, 22, and 23 do not heat up and heat up, so there is no need to provide a cooling system. The drive circuit 300 is dissipated. Moreover, the AC back electromotive force generated by the three-phase coils R, S, T is converted into DC power (damping effect) via the second DC support capacitors C2, C3 and stored in the damping battery Db, and the power can be preferentially supplied to the driven motor 1 Moreover, the endurance of the DC power supply Vdc is increased, and the drive circuit 300 achieves the functions and purposes of energy saving, high efficiency, and high efficiency.

However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the patent specification, All remain within the scope of this new patent.

300‧‧‧ drive circuit

21-23‧‧‧Bridge arm

24-26‧‧‧Flywheel diode group

C1‧‧‧First Support Capacitor

C2, C3‧‧‧ second supporting capacitor

U+, V+, W+‧‧‧ switch

U-, V-, W-‧‧‧ switch

D‧‧‧Flywheel diode

D1‧‧‧First flywheel diode

D2‧‧‧Second flywheel diode

U, V, W‧‧‧ contacts

Np‧‧‧Neutral point

Claims (8)

A driving circuit with a damping function, which is powered by a DC power source for driving a flywheel energy storage device, the flywheel energy storage device comprising a motor as a motor and a generator and a flywheel driven by the motor, wherein the flywheel The motor has a stator, the stator is provided with a three-phase coil, and the three-phase coils are connected to each other to form a Y-shaped winding having a neutral point and three contacts; the driving circuit comprises: three bridges connected in parallel with the DC power source An arm, each of the bridge arms has an upper switch and a lower switch connected in series with a first contact, and two flywheel diodes respectively corresponding to the upper switch and the lower switch and connected in anti-parallel, the upper switch One end is electrically coupled to a positive end of the DC power source, and one end of the lower switch is electrically coupled to a negative end of the DC power source, and the contact of each phase coil corresponds to the first contact of each bridge arm Electrically coupled; three flywheel diode sets in parallel with the DC power supply, each flywheel diode set has a first flywheel diode and a second flywheel diode connected in series with a second contact And each phase coil The contact is electrically coupled to the second contact of each flywheel diode set; two first DC support capacitors are connected in parallel with the DC power supply; and two second DC support capacitors are connected at one end Connected to a third contact, the other end is electrically coupled to both ends of the DC power source, and the third contact is electrically coupled to the neutral point of the three-phase coil. The driving circuit with damping function according to claim 1, wherein the first DC supporting capacitor is a polar capacitor, and the second DC supporting capacitor is a non-polar high frequency capacitor, and the two together constitute a damping capacitance. The driving circuit with damping function according to claim 1, further comprising a damping battery connected in parallel with the DC power source and capable of being repeatedly charged and discharged, and the second DC supporting capacitor discharges the damping battery, and the electric energy is Stored in the damping battery. A driving circuit having a damping function as claimed in claim 3, wherein the damping battery is a capacitor battery or an acid-base resonance battery. A flywheel energy storage system with damping function, which is powered by a DC power supply, and includes: a flywheel energy storage device comprising a motor as a motor and a generator and a flywheel driven by the motor, wherein the motor has a stator The stator is provided with three-phase coils, which are connected to each other to form a Y-shaped winding having a neutral point and three contacts; and a driving circuit comprising: three bridge arms connected in parallel with the DC power supply, Each of the bridge arms has an upper switch and a lower switch connected in series with a first contact, and two flywheel diodes respectively corresponding to the upper switch and the lower switch and connected in anti-parallel, one end of the upper switch A positive end of the DC power source is electrically coupled, and one end of the lower switch is electrically coupled to a negative end of the DC power source, and the contact of each phase coil and the first contact of each bridge arm are electrically coupled. Connected to the flywheel diode group in parallel with the DC power source, each flywheel diode group has a first flywheel diode and a second flywheel diode connected in series with a second contact, and The junction of each phase coil Corresponding to the second contact of each flywheel diode group Electrically coupled; two first DC support capacitors connected in parallel with the DC power supply; and two second DC support capacitors, one end of which is connected in series with a third contact, and the other end of which is connected to both ends of the DC power supply Corresponding to the electrical coupling, and the third contact is electrically coupled to the neutral point of the three-phase coil. The flywheel energy storage system of claim 5, wherein the first DC support capacitor is a polar capacitor, and the second DC support capacitor is a non-polar high frequency capacitor, and the two are combined A damping capacitor. The flywheel energy storage system with damping function according to claim 5, wherein the driving circuit further comprises a damping battery connected in parallel with the DC power source and capable of being repeatedly charged and discharged, and the second DC supporting capacitors dampen the damping The battery is discharged and electrical energy is stored in the damping battery. A flywheel energy storage system having a damping function as claimed in claim 7, wherein the damping battery is a capacitor battery or an acid-base resonance battery.