JP5401865B2 - Flywheel emergency stop device - Google Patents

Description

  The present invention relates to a flywheel emergency stop device.

  A flywheel power storage device that uses a flywheel to store electric power includes a flywheel, a container, a motor / generator, and a bearing. The flywheel power storage device stores power by converting electric power into rotational energy of the flywheel. In this flywheel power storage device, it is necessary to reduce the air resistance and the bearing friction that impede rotation of the flywheel and motor / generator during power storage, so the motor / generator and flywheel operate in vacuum. In addition, a magnetic bearing or the like is used for the bearing that supports the motor / generator to eliminate friction in the bearing. Such a flywheel power storage device is equipped with a function of stopping the rotating flywheel in preparation for an unexpected situation. As a method of stopping the flywheel, a method of free-running the flywheel, a method of consuming electric power generated by the rotation of the flywheel by the control mechanism of the flywheel power storage device, and a large braking force on the rotating flywheel. There is a method of forcibly adding.

For example, as a technique for stopping a rotating flywheel by forcibly applying a large braking force, Patent Document 1 below discloses that a flywheel emergency stop device has a plurality of stages on a main shaft provided coaxially with a generator motor. A high specific heat and high latent heat of vaporization that can effectively remove the heat generated by the frictional force and also increase the frictional force with the flywheel is injected into the casing that individually accommodates the mounted flywheel. It is disclosed. Further, in Patent Document 2 below, a braked cylinder provided with a permanent magnet is fixed to an end of a rotating shaft attached to a flywheel, and a brake cylinder provided with a ferromagnetic material is disposed concentrically with the braked cylinder. In the event of an emergency, a technique is disclosed in which an eddy current is induced in the brake cylinder by causing the brake cylinder to face the braked cylinder and a braking force is applied to the rotating shaft.
JP 08-247183 A JP 09-233803 A

  By the way, in the above prior art, the flywheel rotation is stopped by a method of free running the flywheel or a method of consuming electric power generated by the rotation of the flywheel by the control mechanism of the flywheel power storage device. In such a method, the flywheel can be stopped safely, but a long time is required until the flywheel stops completely. For this reason, it is not appropriate to adopt such a method when the flywheel must be stopped urgently.

  In addition, in the method of stopping the rotation of the flywheel by forcibly applying a large braking force to the flywheel, the size is about the same as that of a flywheel power storage device in order to forcibly apply the braking force to the flywheel. A flywheel emergency stop device is required. There are small flywheel power storage devices that are installed at home and store surplus power, but there are also huge flywheel power storage devices with a flywheel diameter of several meters. When the flywheel of such a huge flywheel power storage device is stopped, the scale of the flywheel emergency stop device becomes large in proportion to the scale of the flywheel power storage device. And in order to install such a huge flywheel emergency stop apparatus, many expenses and a large site will be needed.

  The present invention has been made in view of the above-described circumstances, and can fly the flywheel of a flywheel type power storage device in a short time and the flywheel whose own scale does not depend on the scale of the flywheel type power storage device An object is to provide an emergency stop device.

  In order to achieve the above object, according to the present invention, as a first solving means related to a flywheel emergency stop device, a flywheel power storage device and a load larger than a system load to which the flywheel power storage device supplies power When receiving a load device, a connection destination switching means for switching a connection destination to which the flywheel power storage device is electrically connected, and a flywheel emergency stop instruction, the flywheel power storage device and the load device are connected to the connection destination. A means is adopted that is connected to a switching means and includes a control means that causes the flywheel power storage device to supply electric power to the load device.

  In the present invention, as the second solving means relating to the flywheel emergency stop device, in the first solving means, means is adopted in which the load device is a cooling device for cooling the flywheel power storage device.

  In the present invention, as a third solving means related to the flywheel emergency stop device, in the first or second solving means, the load device is provided so as to be in close contact with an outer wall of the flywheel power storage device. A means is adopted that is constituted by a cooling water circulation pump that circulates the cooling water in the cooling water piping and a cooling fan that blows air to the cooling water circulation pump.

  In the present invention, as a fourth solving means relating to the flywheel emergency stop device, in the second solving means, when the control means accepts a flywheel emergency stop instruction, the cooling pump and the cooling fan are simultaneously activated. Adopt the means to let.

  In the present invention, as the fourth solving means relating to the flywheel emergency stop device, in the second solving means, when receiving the flywheel emergency stop instruction, the control means first activates only the cooling pump, A means for starting the cooling fan in accordance with the amount of power stored in the flywheel power storage device is employed.

  According to the present invention, the flywheel emergency stop device includes a flywheel power storage device, a load device having a load larger than a system load to which the flywheel power storage device supplies power, and the flywheel power storage device is electrically Connection destination switching means for switching the connection destination to be connected to, and when receiving a flywheel emergency stop instruction, the flywheel power storage device and the load device are connected to the connection destination switching means, and the flywheel power storage device By including a control unit that supplies electric power to the load device, the rotation of the flywheel of the flywheel power storage device can be stopped in a short time. Further, in this flywheel emergency stop device, the flywheel emergency stop device is scaled to reduce the scale of the flywheel emergency stop device in order to stop the rotation of the flywheel by the method of consuming the power stored in the flywheel power storage device to the load device. There is no need to increase it in proportion to the scale of the.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The present invention relates to a flywheel emergency stop device of the present invention. FIG. 1 is a schematic diagram showing an outline of the appearance of a flywheel emergency stop device A according to this embodiment. As shown in FIG. 1, in the flywheel emergency stop device A, a cooler 2 and a cooling fan 3 are attached around the flywheel power storage device 1.

  The flywheel power storage device 1 accommodates various internal mechanisms such as a flywheel and a motor / generator by a flywheel chamber 1a, and converts electric power supplied from the outside into rotational energy of the flywheel for storage. Is. Details of the flywheel and the motor / generator will be described later. The cooler 2 includes a cooling water pipe 2a and a cooling water circulation pump 2b, and cools the flywheel power storage device by circulating the cooling water.

  The cooling water pipe 2a is a loop-like pipe provided in close contact with the outer wall of the flywheel chamber 1a, and contains cooling water as a cooling medium therein. The flywheel power storage device 1 is cooled by heat exchange between the cooling water accommodated in the cooling water pipe 2 a and the heat generated from the flywheel power storage device 1. And this cooling water piping 2a is provided with the cooling circulation pump 2b in the middle part. The cooling water circulation pump 2b is a pump that circulates the cooling water in the cooling water pipe 2a at a constant flow rate. And the cooling fan 3 supplies the wind for cooling the cooling water circulation pump 2b, and multiple units | sets are provided in the position which can ventilate the cooling water circulation pump 2b.

  Next, the functional configuration of the flywheel emergency stop device A will be described with reference to FIG. FIG. 2 is a functional block diagram of the flywheel emergency stop device A according to the embodiment. 2 indicate the flow of power, and the dotted arrow indicates the flow of control signals. As shown in FIG. 2, the flywheel emergency stop device A includes a flywheel power storage device 1, a cooling water circulation pump 2 b, a cooling fan 3, an operation unit 4, a connection destination changeover switch 5, a converter 6, and a first inverter 7. Has been.

  The flywheel power storage device 1 includes a flywheel 1b, a motor / generator 1c, an inverter / converter 1d, a ventilation fan 1e, a controller 1f, and a second inverter 1g. The flywheel power storage device 1 is used as a secondary power source for an AC load composed of various facilities and equipment. Normally, power is supplied to an AC load (for example, AC440V) from an AC system (for example, AC440V) via an AC direct transmission path, but when a problem such as power shortage occurs in the power supplied to the AC load, The flywheel power storage device 1 supplies power to the AC load instead of from the AC system.

The flywheel 1b is a disk that is inductively rotated concentrically with the rotating shaft of the motor / generator 1c. The flywheel 1b is rotated by the rotational drive of the motor / generator 1c, and continues to rotate by inertia even when the rotational drive by the motor / generator 1c is stopped.
The motor / generator 1c generates AC power as a generator by converting rotational energy into regenerative energy by decelerating the rotational speed of the flywheel 1b that rotates by inertia, and the AC power is converted into an inverter. / Output to converter 1d. Further, the motor / generator 1c drives the flywheel 1b with AC driving power supplied from the inverter / converter 1d as a motor. In the flywheel power storage device 1, the flywheel 1b and the motor / generator 1c are housed in a vacuumed container in order to reduce air resistance that hinders the operation of the flywheel 1b and the motor / generator 1c. ing.

  The inverter / converter 1d converts the DC driving power of the DC intermediate voltage (for example, 600V) supplied from the converter 6 as an inverter to AC driving power under the control of the control unit 1f, and the motor / The generator 1c is driven as a motor. The inverter / converter 1d converts AC power supplied from the motor / generator 1c as a converter into DC power of DC intermediate voltage under the control of the control unit 1f, and converts the DC power to the first inverter 7 and Output to the second inverter 1g. The first inverter 7 converts a direct current into an alternating current and supplies the alternating current power to the AC load or the cooling water circulation pump 2 b and the cooling fan 3. Moreover, the 2nd inverter 1g converts a direct current into an alternating current, and supplies this alternating current power to the ventilation fan 1e and the control part 1f.

The ventilation fan 1e is a fan that operates by the electric power supplied from the second inverter 1g under the control of the control unit 1f and releases the heat generated from the control unit 1f to the outside.
The control unit 1f is an internal memory composed of a CPU (Central Processing Unit), a ROM (Read Only Memory) and a RAM (Random Access Memory), and an interface for inputting / outputting signals to / from the ventilation fan 1e and the inverter / converter 1d. It is composed of a circuit and the like, and controls the entire operation of the flywheel emergency stop device A based on a control program stored in the ROM and an operation instruction received by the operation unit 4.
The second inverter 1g converts DC power of DC intermediate voltage supplied from the converter 6 or the inverter / converter 1d into AC power, and supplies this AC power to the ventilation fan 1e and the control unit 1f.

The cooling water circulation pump 2b is controlled when power is supplied from the flywheel power storage device 1 via the first inverter 7 by switching the connection destination by the connection destination changeover switch 5, and the operation unit 4 receives a flywheel emergency stop instruction. Under the control of the part 1f, circulation of the cooling water in the cooling water pipe 2a is started.
When the cooling fan 3 is supplied with electric power from the flywheel power storage device 1 through the first inverter 7 by switching the connection destination by the connection destination changeover switch 5 and the operation unit 4 receives a flywheel emergency stop instruction, the control unit Under the control of 1f, air blowing to the cooling water circulation pump 2b is started.

The operation unit 4 receives a flywheel emergency stop instruction by the operation of the operation key by the user and outputs the flywheel emergency stop instruction to the control unit 1f.
The connection destination changeover switch 5 switches the electrical connection destination of the first inverter 7 to the cooling water circulation pump 2b and the cooling fan 3 based on the flywheel emergency stop instruction received by the operation unit 4, that is, the flywheel power storage device. 1 is a switch for switching the power supply destination of one.
The converter 6 converts AC power supplied from the AC system into DC power of DC intermediate voltage, and supplies this old power to the first inverter 7, the inverter / converter 1d, and the second inverter 1g.
The first inverter 7 converts DC intermediate voltage DC power supplied from the converter 6 and the inverter / converter 1 d into AC power, and supplies the AC power to the AC load or the cooling water circulation pump 2 b and the cooling fan 3.

Next, operation | movement of the flywheel emergency stop apparatus A comprised in this way is demonstrated in detail.
First, when a direct current drive current is supplied from the converter 6 to the flywheel power storage device 1, the control unit 1f operates the inverter / converter 1d as an inverter to rotate the flywheel 1b to the motor / generator 1c. Drive. And the control part 1f accelerates the flywheel 1b to 12000 rpm (revolutions per minute: revolutions per minute) over 5 to 15 minutes by the drive by the motor / generator 1c. And if the flywheel 1b accelerates to 12000 rpm, the control part 1f will supply only the electric power of the lowest source which maintains rotation of the flywheel 1b to the motor / generator 1c to the inverter / converter 1d, and the flywheel 1b The rotation state of 12000 rpm is maintained.

  And if the operation part 4 receives a flywheel emergency stop instruction | indication, the control part 1f will convert the alternating current which the motor / generator 1c outputs into a direct current by operating the inverter / converter 1d as a converter, The inverter / converter 1d is caused to output this direct current. Furthermore, the control part 1f operates the ventilation fan 1e with the alternating current supplied via the 2nd inverter 1g from the inverter / converter 1d.

  In the connection destination changeover switch 5, when the operation unit 4 accepts the flywheel emergency stop instruction, the cooling water circulation pump from the state where the first inverter 7 is connected to the AC load or is not connected to anything under the control of the control unit 1 f. 2b and the cooling fan 3 are electrically connected. Thus, the first inverter 7 supplies AC power obtained by converting DC current from the flywheel power storage device 1 to the cooling water circulation pump 2 b and the cooling fan 3.

  Moreover, the cooling water circulation pump 2b and the cooling fan 3 operate | move with the electric power supplied from the 1st inverter 7 under control of the control part 1f, if the operation part 4 receives a flywheel emergency stop instruction | indication. And the heat | fever of the flywheel-type electrical storage apparatus 1 is cooled by the action | operation of the ventilation fan 1e, the cooling water circulation pump 2b, and the cooling fan 3. FIG. Then, when the flywheel power storage device 1 discharges all the electric power, the rotation of the flywheel 1b stops. And if supply of electric power stops because the flywheel type electrical storage device 1 discharges all electric power, the cooling water circulation pump 2b and the cooling fan 3 stop.

  As described above, in the flywheel emergency stop device A according to this embodiment, when the operation unit 4 receives a flywheel emergency stop instruction, the control unit 1f in the flywheel power storage device 1 causes the inverter / converter 1d as a converter. When operated, the DC power is output and the connection destination changeover switch 5 connects the first inverter 7 to the cooling water circulation pump 2b and the cooling fan 3, so that the cooling water circulation pump 2b and the cooling fan 3 are connected to the flywheel power storage device. Since the power stored in 1 is consumed, the power stored in the flywheel power storage device 1 can be discharged in a short time. Therefore, the rotation of the flywheel 1b can be stopped in a short time. Furthermore, since the control unit 1f in the flywheel power storage device 1 consumes electric power by operating the ventilation fan 1e, the rotation of the flywheel 1b can be stopped in a short time.

  Further, in this flywheel emergency stop device A, since the rotation of the flywheel 1b is stopped by consuming the electric power stored in the flywheel power storage device 1, it is proportional to the scale of the flywheel power storage device 1. You don't have to expand your scale. Further, in the flywheel power storage device 1, heat is generated with the output of electric power, but an increase in temperature can be suppressed by the operation of the cooler 2 and the cooling fan 3. Furthermore, since the control unit 1f operates the ventilation fan 1e to release the heat generated from the control unit 1f to the outside of the flywheel power storage device 1, an increase in the temperature of the flywheel power storage device 1 is suppressed. I can do it.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the cooling water circulation pump 2b and the cooling fan 3 are simultaneously activated to stop the rotation of the flywheel 1b of the flywheel power storage device 1, but the present invention is not limited to this.
For example, first, only the cooling water circulation pump 2b may be activated, and the cooling fan 3 may be activated according to the amount of power stored in the flywheel power storage device 1.

(2) In the above embodiment, in order to stop the rotation of the flywheel of the flywheel power storage device 1, the cooling water circulation pump 2b and the cooling are used as loads that consume power stored in the flywheel power storage device 1 in a short time. Although the fan 3 is employed, any other load than the cooling water circulation pump 2b and the cooling fan 3 may be used as long as the load can consume power in a short time.

It is a schematic diagram which shows the outline | summary in the external appearance of the flywheel emergency stop apparatus A which concerns on one Embodiment of this invention. It is a functional block diagram of flywheel emergency stop device A concerning one embodiment of the present invention.

Explanation of symbols

  A ... flywheel emergency stop device, 1 ... flywheel power storage device, 1a ... flywheel chamber, 1b ... flywheel, 1c ... motor / generator, 1d ... inverter / converter, 1e ... ventilation fan, 1f ... control unit, DESCRIPTION OF SYMBOLS 1g ... 2nd inverter, 2 ... Cooler, 2a ... Cooling water piping, 2b ... Cooling water circulation pump, 3 ... Cooling fan, 4 ... Operation part, 5 ... Connection destination switch, 6 ... Converter, 7 ... 1st inverter

Claims (3)

A flywheel power storage device;
A load device having a load larger than a system load for supplying power by the flywheel power storage device;
Connection destination switching means for switching the connection destination to which the flywheel power storage device is electrically connected;
When receiving a flywheel emergency stop instruction, the flywheel power storage device and the load device are connected to the connection destination switching means, and the flywheel power storage device supplies power to the load device; equipped with,
The load device includes a cooling water circulation pump that circulates cooling water in a cooling water pipe provided so as to be in close contact with the outer wall of the flywheel power storage device, and a cooling fan that blows air to the cooling water circulation pump. A flywheel emergency stop device characterized by that. 2. The flywheel emergency stop device according to claim 1, wherein the control unit activates the cooling pump and the cooling fan simultaneously when a flywheel emergency stop instruction is received . The control means, when receiving a flywheel emergency stop instruction, first activates only the cooling pump and activates the cooling fan according to the amount of power stored in the flywheel power storage device. The flywheel emergency stop device according to 1.

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