JPH04351424A - Power supply - Google Patents

Abstract

PURPOSE:To obtain a highly economic space saving power supply which can flexibly accommodate extension of load system by a constitution wherein power converters are distributed and connected with a high quality power supply network to be linked each other and a central control means is provided. CONSTITUTION:A central controller 41 determines effective and reactive powers(demand) to be fed from a high quality power supply network 31 based on information relevant to the conditions of loads 21-24, decides effective and reactive powers to be born by each UPS based on information relevant to the conditions of uninterruptible power supplies UPS 11-14, and provides the linkage controller for the UPS 11-14 with a throw-in parallel off command or control parameters corresponding to demand, e.g. lead power factor operation for compensating the reactive power. Upon interruption or instantaneous voltage drop of first power supply, i.e., commercial power supply, power supply to the high quality power supply network 31 is sustained through a second power supply, i.e., a battery.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

[Industrial Application Field] The present invention relates to a first power source such as a commercial power source, or a second power source using a storage battery, fuel cell, etc. as an energy source.
The present invention relates to a power supply device configured with a power conversion device that inputs a power source and supplies stable alternating current power.

0002

[Background Art] Uninterruptible power supplies (hereinafter referred to simply as UPS) are used as power supplies for important load systems such as computers, and use storage batteries as power sources to supply stable AC power even during AC input power outages or instantaneous voltage drops. is becoming widely used.

Conventionally, there are two types of UPS systems shown in FIGS. 3 and 4. That is, FIG. 3 shows a centralized UPS system in which the UPS 1 is centrally arranged in a power supply room 3 separate from the computer systems 2 for a plurality of computer systems 2, and FIG.
This is a distributed UPS system in which a UPS 1 is placed near each computer system 2. For large-scale systems such as online communication networks,
Normally, the centralized UPS system shown in Figure 3 is used, but it requires a dedicated power supply room and has problems in terms of installation space, economy, and characteristics, such as voltage drop due to the length of the wiring cable between the UPS and the computer system. There is a problem.

0004

[Problem to be Solved by the Invention] Particularly with the recent rapid progress in the information and communication field, the demand for high-grade power supplies such as UPS is increasing rapidly, and it is difficult to respond with the conventional system shown in Figure 3. There are limits, and it is also difficult to expand power supplies to accommodate expansion of computer systems, etc., and it is difficult to respond flexibly unless a plan is made with an accurate estimate of spare capacity from the beginning. SUMMARY OF THE INVENTION Therefore, an object of the present invention has been made in view of the above-mentioned points. Our objective is to provide a highly economical and space-saving power supply that can flexibly accommodate system expansion. [Structure of the invention]

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides stable alternating current power by inputting a first power source such as a commercial power source or a second power source using a storage battery or the like as an energy source. In a power supply device configured with power conversion devices to be supplied, the power conversion devices are arranged in a distributed manner, the power conversion devices are connected to a high-grade power supply network, and configured to be interconnected with each other, and the power supply network A control means is provided for integratedly controlling the power supply network based on information regarding the amount of load on the power supply, the status of the first power supply, the status of the second power supply, and the operating status of the power conversion device. .

[0006]

[Operation] In a power supply device with such a configuration, the power supply,
By optimally controlling the output and connecting/disconnecting each power converter using the load and the status of each power converter as parameters, a high-quality power supply network that is space-saving and flexible for increasing power supply capacity is created. integrated control of the network.

[0007]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 11, 12, 13, and 14 are U units that can be distributed in a computer system like 1 in FIG.
PS, 21, 22, 23, 24 are load systems such as computer systems, 31 is a high-grade power supply network that interconnects the outputs of UPSs 11 to 14, and 41 is UPSs 11 to 1.
Based on the information regarding the status of 4 and the status of loads 21 to 24, a high-grade power supply network. This is an integrated controller that provides control parameters and input/disconnection commands to the UPSs 11 to 14 in order to integrally control the UPSs 31 to 31.

The UPSs 11 to 14 may have different capacities, and a specific example of their configuration is shown in FIG. That is, 51
is a commercial power source (first power source), 52 is a rectifier (converter), 58 is an inverter, 54 is a storage battery (second power source),
55 is a connection/disconnection switch for connecting to and disconnecting from the high-grade power supply network 31; 56 is an inverter 53;
This is a interconnection controller that controls the phase and voltage, as well as interconnection and disconnection, based on commands from the integrated controller 41 in order to interconnect the power source to the high-grade power supply network 31. Next, the operation of the present invention having the above-described configuration will be explained.

[0009] The integrated controller 41 has loads 21 to 24
High-grade power supply network 31 based on information on the status of
The amount of load (demand) to be supplied is divided into active power and reactive power, and from the information regarding the status of UPS 21 to 24, it is determined which UPS should bear how much active power and reactive power, or how much reactive power should be provided. Control parameters and connection/disconnection commands corresponding to demands such as leading power factor operation for compensation are given to the interconnection controller 56 of the UPSs 21 to 24.

[0010] As a result, the UPSs 21 to 24 are controlled by the interconnection controller 56 in an optimum control mode and control amount. (Alternatively, the connection or disconnection is controlled depending on whether grid connection is necessary.) Furthermore, regarding grid connection control, active power and reactive power sharing adjustment control is control of the output phase and output voltage of the inverter 53. It is a known technique to do this,
Control standards are given from the integrated controller 41.

[0011] Furthermore, when a power outage or instantaneous voltage drop occurs in the commercial power source 51, which is the first power source, the inverter 53 uses the storage battery 54, which is the second power source, as an input, as in a normal UPS.
continues supplying power to the high-grade power supply network 31.

[0012] In this way, in this embodiment, the outputs of the distributed UPSs of different capacities are interconnected and the integrated controller performs optimal control according to the demand.
There is no need to provide a dedicated power supply room, and a flexible power supply system can be constructed that allows easy UPS expansion and interconnection in response to load system expansion.

Furthermore, since the interconnection and disconnection of each UPS is controlled according to demand, efficient operation is possible, and low pressure drops due to increased reactive power can be compensated for by controlling the inverter operating mode. It is possible to operate in various modes.

The converter 52 in the specific configuration example of the UPS shown in FIG. 2 is a converter with a regeneration function. Electric power may be regenerated to. The second power source, the storage battery 54, may be another energy source, such as a fuel cell.

[0015] Furthermore, the integrated controller in the embodiment of FIG.
The controller 41 can also add information regarding the status of the first power source 51 and the second power source 54 to the parameters for integrated control. Furthermore, the UPS in FIG. 1 is not limited to a UPS, and may be another power conversion device.

[0016]

As described above, according to the present invention, it is possible to provide a highly economical and space-saving power supply device that can flexibly cope with the addition of a load system typified by a distributed computer system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration example of the UPS in FIG. 1;

FIG. 3 is a block diagram showing a configuration example of a conventional UPS system.

FIG. 4 is a block diagram showing another configuration example of a conventional UPS system.

[Explanation of symbols]

11, 12, 13, 14...Uninterruptible power supply, 21, 22
, 23, 24... Load system, 31... High quality power supply network, 41... Integrated controller, 51... Commercial power supply (first power supply), 52... Rectifier (converter), 53... Inverter, 54... Storage battery (second power source), 55... Connection/disconnection switch, 56... Grid connection controller.

Claims (1)

[Claims] 1. A power supply device configured with a power conversion device that supplies stable alternating current power by inputting a first power source such as a commercial power source or a second power source using a storage battery or the like as an energy source. A high-grade power supply network for interconnecting the outputs of the distributed power conversion devices by providing a plurality of devices and distributing the devices, and a high-grade power supply network for interconnecting the outputs of the distributed power conversion devices, and connecting to the distributed high-grade power supply network. integrated control of the high-grade power supply network based on information such as the plurality of loads to be installed, the amount of load sent from a grid interconnection controller provided in the power conversion device, and the operating status of the power conversion device; 1. A power supply device comprising an integrated controller that performs output control and connection/disconnection control of the power conversion device by the integrated controller and the interconnection controller.