JP2002017042A - Method of controlling power route - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective measure for instantaneous power failure and instantaneous voltage drop to receive the electrical power from a power bus line in view of cutting the peak value of the power or the like. SOLUTION: Electrical power is usually supplied to a load from a power bus line through selective connection to the power bus line, a storage battery and the load. The storage battery is charged with the power on the power bus line. When the storage battery is charged sufficiently, it is left in the waiting condition under the condition that it is ready for discharge. For supply of power to the power bus line, the power is supplied to the load from the storage battery to compensate for shortage. For the instantaneous drop of voltage, the power of storage battery is supplied to the load under the condition that the storage battery is ready for discharge, and discharge of the storage battery is stopped after a predetermined time has passed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power path control method for coping with an instantaneous power failure or an instantaneous voltage drop.

[0002]

2. Description of the Related Art Conventionally, there has been an electric power assisting system called a countermeasure against a power outage or peak demand. For example, this is provided with an alternative power supply device such as a generator such as a turbine or a large-capacity battery, and detects a power failure and supplies power with the alternative power supply device during the power failure. Was completed. However, in systems and computers that use vacuum pumps, not only power outages during operation, but also instantaneous power outages and instantaneous voltage drops (hereinafter “bumps”)
) Caused serious damage, such as a loss of vacuum and the destruction of the disk, causing the process to be restarted from the beginning, and data not being reproducible.

[0003] Such a voltage sag occurs when a failure occurs due to a lightning strike on a transmission line or the like constituting a power system, a failure point is detected by a protection relay, and the failure is removed by a circuit breaker until the failure is removed from the power system. In the meantime, this phenomenon occurs as a phenomenon in which the voltage drops around the failure point. The failure in this case is not simply an accident in which the electric equipment is broken, but a phenomenon in which a system abnormality such as a short-circuit failure due to a lightning strike or a ground fault occurs and an excessive current flows.

As a countermeasure against such a sag, Japanese Patent Laid-Open No.
There is a range from a device for small devices as disclosed in JP-A-112475 to a device for large systems as disclosed in JP-A-08-126210. A well-known method is to insert a choke coil etc. directly into the power line of the small load for a small load such as a home computer, and to install a backup battery for a fragile device such as a memory. It is to be provided. Also, in large-scale cases, in many factories, etc., the generator is always turned on for important loads, disconnected from the power bus line (commercial power system, etc.) by a lightning strike, etc., and power is supplied by private power generation. Have been.

[0005]

However, small devices (personal devices, household devices) that are not provided with instantaneous stoppage measures even when using a CPU or the like have become available. It is impossible for an individual as an ordinary person to take countermeasures against momentary power failure for each device. Also, in factories, etc., it is necessary to foresee that even if the generator does not always drop instantaneously when the generator or the like keeps turning, the total running cost is not only large but also the environment such as noise and exhaust gas. And it is not easy to maintain it.

According to the present invention, in consideration of the above points, the instantaneous interruption of 0.2 seconds or less than the probability of the occurrence of a power failure occurs by far (Joint research on electricity [46] 3). In view of the fact that the discharge power has a large amount of energy in a short time, it is a highly effective, easy-to-maintain voltage sag measure method, and more preferably provides a method that can cut the power peak. is there. Further objects of the present invention are described in detail below.

[0007]

SUMMARY OF THE INVENTION The present invention is selectively connected to a power bus line, a storage battery, and a load, and normally supplies power from the power bus line to the load, and supplies power to the load through the power bus line. A power path control method for supplying power from a storage battery to a load according to a remarkable decrease in power supply, and supplying power from the storage battery to the load for a short time according to a sharp decrease in voltage of a power bus line and a dischargeable state of the storage battery. .

Further, according to the present invention, in response to an output of a detector which is connected to a power bus line and detects a voltage drop of the power bus line and outputs the detected voltage drop, and when the storage battery is in a dischargeable state,
The switch switches the load supply path from the power bus line to the storage battery, or adds power supply from the storage battery to the supply path from the power bus line.

Further, the present invention is selectively connected to a power bus line, a storage battery, and a load, and usually supplies power from the power bus line to the load and charges the storage battery as needed. The storage battery is made to stand by in a dischargeable state, and the power from the storage battery is supplied to the load in response to a remarkable decrease in power supply to the load by the power bus line, so that the voltage of the power bus line rapidly drops and the storage battery can be discharged. Is a power path control method for supplying the power of the short-time storage battery to the load in accordance with the following.

Thus, in such a power path control method, preferably, the storage battery is connected to the power bus line or / and the connection with the load via the AC-DC / DC-AC converter, and only when the battery is charged. This is an AC-DC converter mode.

[0011] Alternatively, or more preferably, the power from the storage battery is supplied to the load in response to a significant decrease in power supply to the load by the power bus line, and the AC-line connected to the storage battery is caused by a sharp drop in the voltage of the power bus line. DC / DC-AC
This is to supply the power of the storage battery to the load for a short time by confirming that the converter is in the dischargeable state in the DC-AC converter mode, or to detect the voltage drop of the power bus line connected to the power bus line. And an AC-DC / DC connected to the storage battery
-A load switch is switched from a power bus line to a storage battery by a high-speed response switch in response to the AC converter being in a dischargeable state in the DC-AC converter mode, and the AC-DC / DC-AC converter is restored when the voltage is restored. And the load is again connected to the supply path from the power bus line after a predetermined time even if the voltage does not recover.

Further, the present invention is selectively connected to a power bus line, a storage battery, and a load, and usually supplies power from the power bus line to the load and, if necessary, AC-DC / DC- connected to the storage battery. The AC converter is switched to the AC-DC converter mode for charging, and if the charging is sufficient, the AC-DC / DC-AC converter connected to the storage battery is made to stand by in a dischargeable state in the DC-AC converter mode. The power from the storage battery is supplied to the load in accordance with the decrease in the power supply to the load by the bus line, and the power of the storage battery is supplied to the load in accordance with the rapid decrease in the voltage of the power bus line and the dischargeable state of the storage battery. This is a power path control method for stopping the discharge of the storage battery after a predetermined time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a power path control method according to the present invention.
And a load (generally called an important load) 2 such as a CVD apparatus and a computer production management system and a storage battery 3 are selectively connected to each other. In order to cut off such a connection, breakers 4, 5, 6, 7 are provided in the connection line. The circuit breaker 5 is a high-speed circuit breaker, and the circuit breaker 4 is a bypass circuit breaker for maintenance of the high-speed circuit breaker 5.

The storage battery 3 is connected to a connection to the power bus line 1 and / or the load 2 via an AC-DC / DC-AC converter 8 and a transformer as required.
The AC-DC / DC-AC converter 8 may be one that can be set in an AC-DC mode and a DC-AC mode by switching the characteristics of the converter, or may be an AC-DC / DC-AC converter.
Any one of a DC converter and a DC-AC converter which is effectively connected to the power path may be used, and in any case, a device which can stand by in synchronization with the AC of the power bus line 1 is preferable.

In general, the circuit breaker 5 generally operates so as to supply the power from the power bus line 1 to the load 2, and the circuit breaker 5 has a remarkable reduction in the power supply to the load by the power bus line 1. And a detector for detecting a sharp drop in voltage. Although not shown, this detector may be provided for the power bus line 1 separately from the circuit breaker 5. Also, a remarkable decrease in power supply means, for example, a supply shortage state in which the active power is 95% or less of the required load power, and a rapid drop in voltage means a state in which the voltage becomes 80% or less within 0.2 seconds. However, the present invention is not limited to such a situation, and if the load is affected, it is regarded as a remarkable decrease in power supply and a sharp drop in voltage. I can do it. Then, by supplying the power from the storage battery 3 to the load 2 in accordance with the decrease in the power supply, a so-called peak cut of the power is performed.
The power of the storage battery 3 is supplied to the load 2 for a short time in accordance with the rapid decrease in the voltage of the power bus line 1 and the dischargeable state of the storage battery 3.

Such a circuit breaker 5 is disclosed in, for example,
It is preferable that the switching or the switching be performed within, for example, 1/8 cycle by a high-speed circuit breaker or the like using an electromagnetic repulsion mechanism as disclosed in Japanese Patent No. 5641. Further, the storage battery 3 is preferably a storage battery suitable for power storage that does not require maintenance over a long period of time, such as circulating two kinds of electrolytes across a diaphragm as disclosed in JP-A-6-5300. However, the circuit breaker is not limited to these examples. The circuit breaker may be a semiconductor circuit breaker according to its power capacity as long as it can shut down at a high speed. It can be appropriately selected according to the situation. For example, a combination of a secondary battery type battery having a large capacity and a primary battery capable of instantaneously discharging may be used.

FIG. 1 shows a power path control system according to the present invention.
This will be described in more detail with reference to FIG. Normally, the circuit breakers 5 and 6 are closed, and the power from the power bus line 1 is supplied to the load 2. AC-DC / DC-
The AC converter 8 is set to the AC-DC converter mode, the circuit breaker 7 is closed, and the storage battery 8 is charged (step S2).
If charging is sufficient, open circuit breaker 7 to open AC-DC / DC
-Set the AC converter 8 to the DC-AC converter mode, and wait the storage battery 3 in a dischargeable state.

When the detector detects a sharp drop in the voltage of the power bus line 1 (step S1), the circuit breaker 5 is opened and the circuit breaker 7 is closed according to the dischargeable state of the storage battery 2,
The discharge of the AC-DC / DC-AC converter 8 is controlled (step S3), and the power of the storage battery 3 is supplied to the load 2. At this time, the built-in timer is timed (step S4), and the circuit breaker is switched over for a predetermined time so that the power of the power bus line 1 is supplied to the load 2 even if there is no voltage recovery.
Is terminated.

When the voltage drop of the power bus line 1 recovers early (step 5), the circuit breaker is switched to connect the load 2 to the supply path from the power bus line 1. When the voltage recovers, the AC-DC / DC is restored. -Synchronize the AC converter 8 (step 6).

Although FIG. 2 shows only the case of a voltage drop, when the power supply to the load 2 by the power bus line 1 is reduced, the power of the load 2 is supplied from both the power bus line 1 and the storage battery 3. By switching the circuit breakers 5, 6, and 7 so as to provide the power, a so-called peak cut such as charging at night and supplying power during the day can be performed. In this case, it is preferable to use a sensor for detecting a shortage of electric power. However, when it is predicted that power supply will rise or fall, charge / discharge control may be performed using a timer without relying on such a sensor. When the electric power from the storage battery 3 is supplied to the load 2 as necessary, the backflow prevention means is provided with an AC-DC / DC-AC
It may be provided in the converter 8 or the like.

Such a storage battery 3 has a capacity of, for example, 1 at the above-mentioned peak cut in the above-mentioned two-electrolyte storage battery.
2,000 kW for one hour, 2
000 kW 1.5 seconds of power can be supplied. Since such a rush-like power is required in the voltage sag countermeasure, when the voltage sag is relatively long, the power of the power bus line 1 is not required for a predetermined time without waiting for the power recovery due to the voltage sag. Is preferably added again. In the embodiment described above, the discharge control of the storage battery 3 is described to be performed by the AC-DC / DC-AC converter 8, but the present invention is not limited to this, and a control circuit such as a microcomputer may be separately provided.
Further, the discharge control for the instantaneous sag may stop the discharge of the storage battery 3 directly instead of stopping the converter. After the power bus line 1 is completely opened, the AC-DC / DC-AC
Since the converter 8 is operating independently, it is preferable to confirm the synchronization when the power is turned on again. Therefore, it is also possible to adopt a method of switching the load supply path from the power bus line 1 to the storage battery 3 by using a switch without using a circuit breaker, or adding the power supply from the storage battery 3 to the supply path from the power bus line 1.

In the instantaneous sag, the power of the storage battery 3 is supplied to the load 2 for a short time in accordance with the sudden drop of the voltage of the power bus line 1 and the dischargeable state of the storage battery 3. With the exception of, discharge was always performed. However, for example, in a case where the AC-DC / DC-AC converter 8 has an AC-DC converter and a DC-AC converter and exclusively drives one of them, the DC-AC converter stands by so that it can always be driven. It is also possible to just change the connection with a sag. Further, when the response of the control system is as fast as nanoseconds or less, the sensor may be used to first confirm the preparation for discharging the storage battery, and if not, the preparation may be performed to control the circuit breaker.

[0023]

As described above, according to the present invention, it is possible to quickly and safely perform power compensation for a voltage drop that may cause a device to be seriously affected. Can also protect equipment and processes. In addition, maintenance becomes easy by selecting a storage battery. Furthermore, there is no noise or exhaust gas for the turbine generator and the like, and the environment is not unnecessarily polluted. Also, in a factory or the like, it can be used together with another system or the like depending on the type and arrangement of the load, so that the installation is relatively easy. Also, by selecting the storage battery capacity according to the capacity of the load, it is possible to cope with even relatively small-scale loads, and it is possible to use the peak cut of power demand together, so it can be introduced even to ordinary households with small contract power. Thus, no matter what kind of equipment is used at home, it is possible to take measures against sag.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a power path control method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a power path control method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power bus line 2 Load 3 Storage battery 8 AC-DC / DC-AC converter

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuru Mizumoto 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Ryoji Hatano 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Tottori Inside Electric Co., Ltd. (72) Inventor Yasushi Moriya 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Toshiaki Nakayama 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Tottori Electric Corporation F term (reference) 5G015 FA16 GA06 HA16 JA26 JA34 JA52 5G066 JA02 JA05 JB03 5H007 AA05 AA08 AA17 BB05 CA00 CB00 FA02 FA12 GA01 GA08

Claims (7)

[Claims] An electric power bus line, a storage battery, and a load are selectively connected to each other, and usually supply power from the power bus line to the load, and from the storage battery in response to a significant decrease in power supply to the load by the power bus line. A power path control method comprising: supplying power of a storage battery to a load, and supplying power of the storage battery to the load for a short time in accordance with a sharp decrease in the voltage of the power bus line and a dischargeable state of the storage battery. 2. A load supply path is switched by a switch according to an output of a detector connected to the power bus line and detecting a voltage drop of the power bus line and outputting the detected voltage drop, and a storage battery being in a dischargeable state. A power path control method, comprising switching from the power bus line to the storage battery or adding power supply from the storage battery to a supply path from the power bus line. 3. A power bus line, a storage battery, and a load are selectively connected. Normally, power from the power bus line is supplied to the load and the storage battery is charged as necessary. Waits in a dischargeable state, supplies power from the storage battery to the load in response to a significant decrease in power supply to the load by the power bus line, and responds to a sharp drop in the power bus line voltage and the dischargeable state of the storage battery. A power path control method, comprising: supplying power of a short-time storage battery to a load for a short time. 4. The storage battery is connected to a power bus line and / or a load via an AC-DC / DC-AC converter, and is in an AC-DC converter mode only when charged. The power path control method according to claim 1, 2 or 3, wherein 5. The power bus line, a storage battery, and a load, selectively connected to the load, typically supplying power from the power bus line to the load, and from the storage battery in response to a significant decrease in power supply to the load by the power bus line. Power to the load, and confirms that the AC-DC / DC-AC converter connected to the storage battery is in a dischargeable state in the DC-AC converter mode due to a sharp drop in the voltage of the power bus line, and is then turned on for a short time. A power path control method, comprising supplying power of a storage battery to a load. 6. An output of a detector connected to the power bus line and detecting and outputting a voltage drop of the power bus line, and an AC-DC / DC-AC converter connected to the storage battery operates in a DC-AC converter mode. The load supply path is switched from the power bus line to the storage battery by a high-speed response switch in response to the dischargeable state, and the voltage is restored by synchronizing the AC-DC / DC-AC converter when the voltage is restored. A power path control method characterized in that a load is connected to a supply path from a power bus line again after a predetermined time even if the load is not performed. 7. An AC-power supply, which is selectively connected to a power bus line, a storage battery, and a load, usually supplies power from the power bus line to the load and, if necessary, connects to the storage battery.
The DC / DC-AC converter is switched to the AC-DC converter mode for charging, and if the charging is sufficient, the AC-DC / DC-AC converter connected to the storage battery is switched to the DC-A
In the C converter mode, a standby state is set in a dischargeable state, and power from the storage battery is supplied to the load in response to a decrease in power supply to the load by the power bus line, so that the voltage of the power bus line rapidly drops and the storage battery is discharged. A power path control method comprising: supplying power of a storage battery to a load according to a possible state and stopping discharge of the storage battery after a predetermined time.