JPS63240318A - Non-interrupted electric source - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Application field on M beam) The present invention relates to a parallel redundant uninterruptible power supply.

(Prior art) In conventional parallel redundant uninterruptible power supplies (hereinafter referred to as UPS), AC input is normally converted to DC using a rectifier circuit, and power is supplied to an inverter circuit while charging a storage battery. supplying. The inverter circuit converts the DC output from the rectifier circuit into AC to supply gravity to the load. When a power outage or instantaneous power outage occurs, the m battery instantly discharges and supplies storage battery power to the inverter circuit. When AC input is restored, gravity is supplied from the rectifier circuit to the inverter circuit and storage battery again.The 6-parallel redundant system is configured so that when one UPS fails, the other UPS supplies power to the load. Problems to be Solved) In the conventional device with the above configuration, when one UPS has an internal failure, a large failure flow flows from the other healthy UPS to the failed LIPS, and even the healthy UPS is overloaded. There was a possibility that the power supply would stop supplying power to the load.

In order to continue supplying power to the load without stopping a healthy UPS, the inductance of the reactor on the output side had to be made sufficiently large in order to keep the capacity of the UPS above-mentioned fault current below a certain value. . but,
This large inductance causes large voltage distortion when a high frequency current is supplied from the load side, impairing the performance of the UPS.

The present invention has been considered in view of the above-mentioned drawbacks, and even if one UPS has an internal failure.

The objective is to provide a system that continues to supply power to the load without excessively increasing the UPS w amount and without stopping a healthy UPS by suppressing the fault current flowing from a healthy tlPR. [Structure of the Invention] (Means for Solving Problems) The present invention provides a parallel redundant type uninterruptible power supply device consisting of two uninterruptible power supply devices, which is equipped with a reactor on the output side of the uninterruptible power supply device. In addition, the output bus of each of the 11 non-stop power supplies is wound so as to cancel the inductance of the actuator of the other non-stop tjtvL power supply device, and then connected to the bus that supplies power to the load.
It is a source device.

(Function)' An embodiment of the present invention in which the output currents of the respective uninterruptible power supplies pass through each other will be described with reference to FIG.

LIPS 8 and 9 are rectifier circuits 1. Inverter circuit 2.
For U['S consisting of storage battery 3, inverter circuit 2
Penetrating reactors 51 and 52 are provided on the output side of the reactor. ups s, the output bus of the inverter circuit 2 passes through the feedthrough reactor 51, and further tlP
It also passes through the through-type reactor 52 provided in S9. On the other hand, in the UPS 9, the output bus of the inverter circuit 2 passes through the feedthrough reactor 52 in the opposite direction to the output bus of the UPS a, and
It also passes through the through-type reactor 51 provided in the.

As mentioned above, the output buses of both UPSs are connected to a common bus that supplies power to the load after passing through the two feed-through reactors 51 and 52 in opposite directions.As a result of the six or more configurations, the output buses of both UPSs are normally feed-through type in UPS 8. The output current of UPS 8 and the output current of UPS 9 flow in opposite directions to the output buses of UPS a and LIPS 9 that pass through reactor 51, respectively. Similarly, the UPS 9 also penetrates through the through-type reactor 52. , upss and UPS
The output bus of 9 has the output current of UPS 8 and the UPS
The output current of 9 flows in the opposite direction. Furthermore ups s and UP
S9 is operated with an approximately equal output current.

Therefore, the inductance of the through-type reactors 51, 52 is almost zero during normal operation, and no drop in output voltage occurs during constant operation. but,
In the unlikely event that a failure occurs inside υPS8, the output t1 of a healthy UPS9! The current flows toward the failure point. Therefore, among the output buses that pass through the feed-through reactors 51 and 52, the current flows only to the output bus of the UPS 9, so the inductance of the single feed-through reactor appears to be large, and the inductance from the UPS 9 to The inflowing fault current will be significantly suppressed.

Of course, the tJPs 8 will stop operating due to an internal failure, but until the UPSS is stopped (until the fault point is disconnected), the output current of the uPs 9 will be the composite current of the load current and the fault current, and it will not be in an overload operating state. However, as mentioned above,
Since the fault current is reduced by the through-type reactors 51 and 52, the UPS 9 can continue supplying power to the load without stopping by simply providing an overload capacity corresponding to the reduced fault current.

In the embodiment shown in FIG. 1, each of the UPSs 8 and 9 was equipped with through-type reactors 51 and 52, but as shown in FIG.
A common through-type reactor 1-53 is provided on the output side of s8.9, and after passing the through-type reactor 53 through the output bus of S8 and the output bus of UPS 9 in opposite directions, power is supplied to the load. The same effect can be obtained by connecting to a common bus line.

Further, the same effect can be obtained even if a wound reactor 54 is used as shown in FIG.

〔Effect of the invention〕

As mentioned above, the UPS that constitutes the parallel redundant system
By equipping the output side of the UPS with a reactor and passing the reactor through the output bus of each UPS in opposite directions,
Because the fault current can be suppressed in the event of an internal failure in one UPS,
There is no need to continue supplying power to the load and make a normal, healthy UPS into IJI)S with an excessively large margin.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an uninterruptible 11 power supply device showing one embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing other embodiments. 1... Rectifier circuit 2... Inverter circuit 3...
Storage battery 4...Load 6,7...UPS8.9
... UPS51.52.53 with reactor...
・Through-type reactor 54... Wound type reactor Representative Patent attorney Nori Chika Yudo Hirofumi Mitsumata Figure 1 Figure 2

Claims (1)

[Claims] In a parallel redundant uninterruptible power supply consisting of two uninterruptible power supplies, a reactor connected to the output side of the uninterruptible power supply, and an output bus of one uninterruptible power supply connected to the other uninterruptible power supply. An uninterruptible power supply device comprising: a connection circuit that is connected to cancel the inductance of the reactor of the device.