JP2003274562A - Auxiliary power equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in a conventional system that conventional auxiliary power equipment uses a storage battery contain a component designated as industrial waste or a flywheel-type power unit can supply power for a short time. <P>SOLUTION: For solving the problem, this auxiliary power equipment has n (n is an integer of one or larger) pairs of flywheel power storages, and when input power is normal, this derives n pairs of flywheels, using the input power; and when the input power is cut off, this outputs the power generated in one pairs of flywheel power storages as an auxiliary power source and also supplies n+1 pairs of flywheel power storages and supplies power to n-1 pairs of flywheel power storages and repeats the above action until the n-th pairs of the flywheel storages fail to supply power, thereby enabling long time supplying of power. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply auxiliary device for extending the compensation time of a power supply by using a power storage device utilizing inertia against a voltage drop or interruption of an AC power supply.

[0002]

2. Description of the Related Art In recent years, computers, mobile terminal base stations,
Power supplies are becoming more important in semiconductor manufacturing equipment and the like. Also, stable supply of AC power is an important issue in the security field and the surveillance field. However, as long as a commercial power source is used, a momentary power failure due to a natural phenomenon such as a lightning strike or an accident on a transmission line is unavoidable, and a voltage drop or interruption occurs.

A UPS (Uninterrupted Power Supply:
Uninterruptible power supply) is used to achieve stable power supply. Here, a general configuration example of UPS will be described focusing on the guaranteed time. When the power supply is cut off for a relatively short period of time, it is common to convert the power of a storage battery, which has been constantly charged, into an AC power supply to compensate. In addition, a system in which a diesel generator or the like is combined with a storage battery has been put to practical use for long-term power interruptions such as several minutes and several hours. A common component of these systems is the use of storage batteries. However, since the storage battery has not only a life due to charging and discharging but also natural deterioration, it is necessary to replace the storage battery after a fixed time regardless of whether it is used or not. In this way, the storage battery not only has problems in maintenance but also contains certain hazardous industrial waste such as lead in the storage battery components.Therefore, it is necessary to consider that no pollution will occur during disposal. There is.

As one method for solving such a problem, there is a flywheel type power storage device that does not use a storage battery. At present, those exceeding several kVA to 1000 kVA are put into practical use. Here, an example of the outline and operation of the flywheel power storage device will be described with reference to FIG. The AC input IN-AC applied to the input terminal 1 is applied to the voltage detector 2, the terminal a of the switch SW1, and the motor M of the flywheel power storage device FG. When the rated voltage is supplied to the input terminal 1, the voltage detector 2 outputs the control signal X1 for connecting the terminals a and c of SW1. The AC input IN-AC that has passed through the c terminal of SW1 is added to the CVCF (constant voltage / constant frequency converter) 3, and the voltage and frequency are stabilized and output from the output terminal 4 as OUT-AC. On the other hand, the motor M of the flywheel power storage device FG is always supplied with the AC input IN-AC, and rotationally drives the flywheel F and the generator G directly connected to the motor M. Next, the operation when the AC input IN-AC is no longer supplied will be described. When AC input IN-AC is no longer supplied, the flywheel power storage device FG motor M
The electric power that was supplied to the flywheel F stops and the rotational energy cannot be supplied to the flywheel F, but the flywheel F continues to rotate due to inertia. Therefore, the kinetic energy stored up to now is released, and the generator power GAC is obtained from the generator G directly connected to the flywheel F. At the same time, the voltage detector 2 detects the disconnection state (voltage drop) of the AC input IN-AC and outputs the control signal X1 for connecting the b terminal and the c terminal of SW1. As a result, the output of the generator power GAC is applied to the CVCF3 from the b terminal of the SW1 via the c terminal, and the voltage and frequency are stabilized and output from the output terminal 4 as OUT-AC.

As described above, even if the input power source IN-AC is not supplied, the power from the flywheel type power storage device can be supplied for a certain period of time. Note that, here, the motor M and the flywheel F are described separately for explaining the principle. However, when a DC motor is used as the motor M, it is obvious that not only the shaft can be rotated by applying a DC power supply, but also the shaft can be rotated for power generation. Therefore, it is possible to share the motor M with the generator G. Further, by inserting a clutch (not shown) between the flywheel F and the generator G and mechanically coupling the flywheel F and the generator G only when the input voltage drops, the drive of the motor M in the steady state is performed. It can also be configured to reduce power. The electric power for driving the flywheel F of the flywheel type power storage device FG is about several tens W in a device having a power generation capacity of about 30 kVA. The electric power for constantly rotating the once-rotated flywheel in this way may be extremely small compared to the generated electric power.

Here, the flywheel F of the flywheel type power storage device continues to rotate due to inertia after the drive is stopped when the load is not applied, but the rotational speed gradually increases due to the friction of the bearing and the windage loss of the flywheel. It drops and eventually stops. FIG. 3 shows an example of the compensation time (vertical axis) and load factor (horizontal axis) of the flywheel type power storage device. When the load factor is about 25%, it takes about 60 seconds, and when the load factor is 100%, Power can be supplied for about 10 seconds. In this way, a flywheel power storage device that is pollution-free and excellent in maintenance and maintenance alone can only compensate the power supply for several tens of seconds.

[0007]

As described above, in the conventional flywheel power storage device, a separate engine generator or the like is required for a power failure exceeding several tens of seconds, which is significantly low in cost and installation area. It has inferior drawbacks. In addition, a battery for starting the generator may be required separately, and batterylessness cannot be expected. It is an object of the present invention to eliminate these drawbacks and to provide a power auxiliary system that can withstand a power cut for several minutes without using a storage battery.

[0008]

In order to achieve the above-mentioned object, the present invention has n (two or more positive numbers) sets of flywheel type power storage devices for driving a flywheel with an input power source,
When the input power supply is cut off, the outputs of the n sets of flywheel power storage devices are sequentially switched to perform long-term power failure compensation.

Further, while input power is being supplied to the n sets of flywheel type power storage devices, input power is supplied to all flywheel type power storage devices to rotate the flywheels. When the power supply is cut off, the power generated in any one of the flywheel-type power storage devices is output as an auxiliary power supply, and the remaining flywheel-type power storage devices are also supplied with power. .

Further, when the power of the flywheel type power storage device used as the auxiliary power source becomes less than a predetermined value, the power generated by the next set of flywheel type power storage devices is output as the auxiliary power source and the remaining power is output. Electric power is also supplied to the flywheel power storage device, and this operation is repeated thereafter.

That is, when the generated voltage of the first flywheel type power storage device drops, the output of the next flywheel type power storage device is used to supply power to n-2 sets of flywheel type power storage devices. To do. In this manner, the switching operation is repeated until the n-th flywheel power storage device cannot supply power, thereby enabling power supply for a long time.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIG. The same numbers / symbols are used for the same functions as those in FIG.

Although FIG. 1 shows a configuration in which three flywheel power storage devices are used, it can be easily expanded to an n-unit configuration. The parts added to FIG. 2 are SW202, SW302 and generators G1, G2 for switching the motor drive power source.
A voltage monitor 101, 201, 301 for monitoring the G3 output, output switches SW101, SW201, SW301, and a sequencer 5 for outputting a control signal for switching each switch are added.

Next, the relationship between each switch, the detection signal and the control signal will be described in detail with reference to the timing chart of FIG.
FIG. 4 shows the situation from p indicating the state of “input power supply cut” in which the input power supply IN-AC has dropped to t indicating “return of input power supply”. Note that IN-AC, GAC, and OUT-AC indicate AC voltage, and "High level" is AC100V, for example. The "High level" and "Low level" of other signals represent logical signals. Furthermore, the vertical lines are arbitrary time intervals, and are added to clarify the timing relationship. Here, if a voltage drop occurs from p to t in the figure, the control signal X1 of the voltage detector 2 is
Similarly, it outputs "Low level" from p to t, and b- of SW1
Control between c is conducted. As a result, the generator power GAC is selected during the period from p to s, and power supply compensation is performed during the period from p to s like OUT-AC.

Next, flywheel type power storage devices FG1, F
The operation regarding G2 and FG3 will be described step by step. When the sequencer 5 receives the X1 signal indicating the voltage drop at the timing of p, it outputs the enable signal C101 to the voltage monitor 101. Then, the voltage monitor 101 outputs a control signal X101 for connecting the terminals a and c of SW101. The generator G1 of the flywheel power storage device FG1 generates the generator power GAC1, but soon the specified power cannot be obtained at the timing q, and the voltage monitor 101 sends the detection signal D101 to the sequencer 5.

On the other hand, SW2 of the flywheel power storage device FG2
02 is set to "Low" by the switching signal X202 from the sequencer 5.
level "period, that is, OUT-AC of CVCF3 is selected from p to q, and electric power is supplied to the motor M2.
This power is a part of the power generated by G1. Then, at timing q, the enable signal C201 indicates that the voltage monitor 201
Is output to. Then, the voltage monitor 201 outputs the control signal X201 for connecting the terminals a and c of the SW201. The generator G2 of the flywheel power storage device FG2 generates the generator power GAC2, but soon the specified power cannot be obtained at the timing of r, and the detection signal D from the voltage monitor 201.
201 is sent to the sequencer 5. SW302 of the flywheel type power storage device FG3 is a switching signal X from the sequencer 5.
By 302, OUT-AC of CVCF3 is selected and power is supplied to the motor M3 during the "Low level" period, that is, from p to r.

Generator G3 of flywheel type power storage device FG3
Generates the generator power GAC3, but soon the specified power cannot be obtained at the timing of s, the voltage monitor 301 sends the detection signal D301 to the sequencer 5, and the power supply auxiliary operation ends. Then, the control signal X1 of the voltage detector 2 becomes "High level" at the timing of t when the power is restored, and the input power IN-AC is input again to the motors M1, 2, 3 of the flywheel type power storage devices FG1, FG2, FG3. Joins and starts power generation. Therefore, the detection output D101, 201, 201 of the voltage monitor 101, 201, 301,
301 becomes "High level" a little later than the timing of t.

Incidentally, the power supply auxiliary device of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the present invention. It is obvious that the same effect can be realized by performing software processing by using the CPU for control and detection instead of the sequencer control. Also, voltage monitor
It goes without saying that the present invention can be realized even with a configuration in which 101, 201, and 301 are combined into one set and the input is switched. Furthermore, it is clear that there is no problem with the principle of the present invention whether the input power source is a single-phase AC power source or a three-phase AC power source.

[0019]

As described above, according to the present invention, it is possible to provide an auxiliary power supply device that can supply power for a long time without using a storage battery at all and is friendly to the global environment.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention.

FIG. 2 is a block diagram showing an example of an auxiliary power supply system using a flywheel power storage device.

FIG. 3 is a diagram showing an example of a load factor and a compensation time of a flywheel power storage device.

FIG. 4 is a timing diagram showing control signals of FIG.

[Explanation of symbols]

1: AC input terminal, 2: Voltage detector, 3: CVCF (constant voltage constant frequency converter), 4: AC output terminal, 5: Sequencer, 101, 201, 301: Voltage monitor FG, FG1, FG2, FG3 : Flywheel power storage device M, M1, M2, M3: Motor F, F1, F2, F3: Flywheel G, G1, G2, G3: Generator GAC, GAC1, GAC2, GAC3: Generator power SW1, SW101, SW201, SW301, SW202, SW302: Switch D101, D201, D301: Voltage drop detection signal C101, C201, C301: Enable signal X1, X101, X201, X301: Switch drive signal IN-AC: AC input OUT-AC: AC output

Claims (3)

[Claims] 1. An n (a positive number of 2 or more) set of flywheel type power storage devices for driving a flywheel with an input power source,
A power supply auxiliary device characterized in that when the input power supply is cut off, long-term power failure compensation is performed by sequentially switching the outputs of the n sets of flywheel type power storage devices. 2. The power supply auxiliary device according to claim 1, wherein input power is supplied to all flywheel type power storage devices while input power is supplied to the n sets of flywheel power storage devices. Then, the flywheel is rotated and the input power is cut off.
A power supply auxiliary device configured to output electric power generated by a pair of flywheel power storage devices as an auxiliary power supply and also supply power to the remaining flywheel power storage devices. 3. The power supply auxiliary device according to claim 2, wherein when the power of the flywheel type power storage device used as the auxiliary power source becomes a predetermined value or less, it is generated in the next set of flywheel type power storage devices. A power supply auxiliary device, which outputs electric power as an auxiliary power supply and also supplies electric power to the rest of the flywheel power storage device, and thereafter repeats this operation.