Power supply device management system

Abstract

To provide a power supply management system in which rectifiers are controlled to operate at high efficiency, thereby to achieve a reduction in the number of the rectifiers, in view of such an actual situation that, in a power supply system, there is a large divergence between actual load and rated load, so that a plurality of rectifiers including a standby rectifier are to be operated under low load.SOLUTION: In a power supply management system, the operating status of rectifiers 20a, 20b, ......, 20n and an output capacity B1 of these rectifiers, a load capacity B2 of a server 10 and a charge capacity B3 of a storage battery 50 are input to a PLC 2 so that a sufficient number of rectifiers 20a, 20b, ......, 20n to ensure the output capacity B1 that can supply the load capacity B2 are to be operated.EFFECT: By operating a necessary and sufficient number of rectifiers 20a, 20b, ... ..., 20n for actual load, the number of the rectifiers 20a, 20b, ... ..., 20n in operation can be reduced and the rectifiers can be operated at high efficiency, so that the number of standby rectifiers for rotating operation can be also reduced and non-load loss can be reduced.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power supply device management system that manages a power supply device so that it can operate with a power supply device (rectifier) of an appropriate capacity with respect to the rated load of a device such as a server (communication device).

Background Art

[0002] Considering the relationship between the capacity and the number design of the rectifier of the power supply device, the capacity of the power supply device is determined based on the rated load on the load side such as a server. For example, if the rated load is 24 kW, the power supply device has four 6-kW units and one to two standby units installed. In this case, the total power capacity is set to 30 to 36 kW. That is, from the viewpoint of reliability of ensuring a stable power supply even in an emergency, one to two units are installed with respect to the number N required for the rated load.

[0003] For example, Patent Document 1 discloses that, as a DC power supply device that controls power supply of a rectifier device, the output current of each rectifier device operated in a redundant manner is detected, and an output current total voltage signal corresponding to the total output current of the rectifier devices is formed, and each rectifier processes the output current total voltage signal according to a predetermined mode, and has a self-determination function as to whether to resume power supply or stop power supply by itself.

[0004] Further, Patent Document 2 discloses a redundant power supply device and a power input limiting circuit for a power supply that can always operate all the power supplies including the redundant part without requiring a redundant AC input capacity. That is, it is configured to have a power supply unit in which (N + M) power supplies (N and M are integers of 1 or more) are connected in parallel, a detection means for detecting the AC input capacity to the power supply unit, and an output limiting means for limiting the output capacity of each power supply so that the AC input capacity detected by the detection means becomes the AC input capacity to the power supply unit required when N power supplies output the rated output.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The power supply devices disclosed in Patent Document 1 and Patent Document 2 described above are both designed such that the power supply capacity is determined including a redundant portion with respect to the rated load.

[0007] By the way, when comparing the rated load of a server or the like with the actual load during operation, it has been found by actual measurement and investigation that there is a large deviation. In the case of the power supply devices disclosed in Patent Document 1 and Patent Document 2, in order to ensure the reliability of the power supply device, a redundant system is adopted and the allowable capacity of the power supply device is increased. On the other hand, the loss of the power supply device generally consists of no-load loss (standby power) that consumes a certain amount of power even when no load is applied and load loss designed based on the load factor. The power supply device is designed to be highly efficient when the load factor is high.

[0008] As described above, since there is a large deviation between the rated load and the actual load, and the load factor on the load side during operation of the power supply device is small, the power supply device is operating in a low-efficiency state. For this reason, for example, even though it is more advantageous and has higher operating efficiency to operate one power supply device at 90% power, three power supply devices are operated at 30% power.

[0009] Moreover, since the power supply devices disclosed in Patent Document 1 and Patent Document 2 described above are operated based on a preset mode, they operate in a state where the actual load is small, and thus the efficiency of the power supply device is inferior.

[0010] Therefore, an object of the present invention is to provide a power supply device management system that eliminates the deviation between the actual load and the rated load of a server or the like, operates a power supply device (rectifier) with high efficiency, and reduces the number of installed power supply devices (rectifiers).

Means for Solving the Problems

[0011] As a technical means for achieving the above object, a power supply device management system according to the present invention is a power supply device management system that controls a power supply device including a plurality of rectifiers connected in parallel and a storage battery charged by the output of these rectifiers. Information about the operating state of each of the plurality of rectifiers, the output capacity output from the plurality of rectifiers, the load capacity for operating the device on the load side, the state of a switch for switching conduction / non-conduction of the current supplied to each of the plurality of rectifiers, and the charge capacity of the storage battery are input to a programmable logic controller (PLC (Programmable Logic Controller)), and based on the load capacity, the number of operating rectifiers is adjusted, the number of operating rectifiers is controlled so that the rectifiers operate with high efficiency, and charging and discharging of the storage battery are performed as necessary.

[0012] By operating the rectifier with an output capacity corresponding to the actual load capacity of the operated device, the rectifier operates with high efficiency. For this reason, as described above, by operating one rectifier with 90% power, two of the three rectifiers that were conventionally operated with 30% power can be reduced. Also, at low loads, the rectifier will be stopped, eliminating no-load losses. Also, by providing standby rectifiers, when a failure of a rectifier is detected, the rectifier can be disconnected and the standby rectifier can be switched in to continue stable operation against load fluctuations.

[0013] Also, in the power supply device management system, the PLC is connected to a centralized management center via a network, and based on the measured values sent from the PLC, the centralized management center manages and sends a control signal for the rectifier to the PLC, and the PLC can control the number of operating rectifiers based on this control signal.

[0014] For example, it can manage the power supply management of multiple scattered data centers at a single centralized management center.

[0015] Also, the power supply device management system according to the present invention combines a DC power supply device unit composed of a plurality of rectifiers connected in parallel and a storage battery charged by the output of these rectifiers, connects the plurality of DC power supply device units by bus wiring, and for each DC power supply device unit, the power of the AC power input to the plurality of rectifiers, information about the operating state of each of the plurality of rectifiers, the output capacity output from the plurality of rectifiers, the load capacity for operating the device on the load side, the state of the switch for switching the conduction / non-conduction of the current supplied to each of the plurality of rectifiers, and the charge capacity of the storage battery are input to a programmable logic controller (PLC), and based on the load capacity, the number of operating rectifiers between the DC power supply device units is adjusted between the DC power supply device units, and the number of operating rectifiers is controlled so as to operate with high efficiency, and charging and discharging of the storage battery are performed as necessary.

[0016] It enables power sharing between multiple DC power supply device units. Therefore, the operating efficiency of the rectifiers of the entire facility composed of multiple DC power supply device units can be increased, the number of rectifiers of the entire facility can be efficiently controlled, and no-load losses can be reduced.

[0017] In addition, in the above-described power supply device management system, each PLC of the DC power supply device unit is connected to a centralized management center via a network, and based on the information sent from each PLC, the centralized management center manages the information and sends a control signal for the rectifier to each PLC. The PLC can control the number of operating rectifiers based on this control signal.

Advantages of the Invention

[0018] According to the power supply device management system of the present invention, by appropriately controlling the operating state of the rectifier, the rectifier can be made to have a capacity corresponding to the load capacity. Therefore, by operating the rectifier efficiently, the number of rectifiers can be reduced and the no-load loss can be reduced.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0020] Hereinafter, based on the illustrated preferred embodiments, the power supply device management system according to the present invention will be specifically described.

[0021] Figure 1 shows the configuration of the power supply device management system according to the present invention. A plurality of servers (communication facilities) 10 are installed in parallel as loads. A plurality of rectifiers 20a, 20b, ……, 20n, which are power supply devices that supply DC power to operate these servers 10a, 10b, ……, 10n, are installed. These rectifiers 20a, 20b, ……, 20n are connected in parallel and are respectively connected to the main switchboard 35 via electromagnetic switches 31a, 31b, ……, 31n, circuit breakers 32a, 32b, …… 32n, and current measuring devices 33a, 33b, …… 33n. This main switchboard 35 is connected to the AC power supply 1, and AC power is supplied to the rectifiers 20a, 20b, ……, 20n. The DC power rectified and output by the rectifiers 20a, 20b, ……, 20n is input to the servers 10a, 10b, ……, 10n via the circuit 40. Also, a storage battery 50 is connected to the circuit 40 in parallel with the rectifiers 20a, 20b, ……, 20n. Further, the above-described current measuring devices 33a, 33b, …… 33n may be circuit breaker integrated type current measuring devices integrally incorporated with the electromagnetic switches 31a, 31b, ……, 31n and the circuit breakers 32a, 32b, …… 32n, or may be circuit breaker separated type current measuring devices. Note that these electromagnetic switches 31a, 31b, ……, 31n, circuit breakers 32a, 32b, …… 32n, and current measuring devices 33a, 33b, …… 33n are housed in the switchboard 30.

[0022] The above-described current measuring devices 33a, 33b, …… 33n, electromagnetic switches 31a, 31b, ……, 31n, and circuit breakers 32a, 32b, …… 32n are connected to the PLC 2. The current values measured by the current measuring devices 33a, 33b, …… 33n are supplied to the PLC 2, information regarding the open / closed states of the electromagnetic switches 31a, 31b, ……, 31n is supplied to the PLC 2, and commands for the opening / closing operations of the electromagnetic switches 31a, 31b, ……, 31n are sent from the PLC 2. Note that the AC power supplied to the rectifiers 20a, 20b, ……, 20n is the total value of the AC currents measured by the ammeters 33a, 33b, ……, 33n for the operating rectifiers 20a, 20b, ……, 20n, and is measured by the current measuring device 35a in the main switchboard 35. That is, the measured value ΣA by the current measuring device 35a is the sum of the measured values A1, A2, ……, AN by the ammeters 33a, 33b, ……, 33n.

[0023] Also, a current measuring device 21 is arranged on the upstream side of the circuit that branches to the storage battery 50 in the circuit 40 connected to the rectifiers 20a, 20b, ……, 20n, a current measuring device 22 is arranged on the downstream side, and a current measuring device 23 is arranged on the circuit from the branch to the storage battery 50. That is, the DC current output from the rectifiers 20a, 20b, ……, 20n is measured by the current measuring device 21, and the DC current supplied to the servers 10a, 10b, ……, 10n is measured by the current measuring device 22. Also, the capacity of the storage battery 50 during charging or discharging is measured by the current measuring device 23. That is, the current measured by the current measuring device 22 is the load capacity B2 consumed by the operation of the servers 10a, 10b, ……, 10n. Also, the current measured by the current measuring device 21 is the output capacity B1 output from the rectifiers 20a, 20b, ……, 20n. Also, the current measured by the current measuring device 23 is the difference between the output capacity B1 and the load capacity B2. When the capacity to operate the servers 10a, 10b, ……, 10n is insufficient, it is discharged from the storage battery 50 to make up for the insufficient capacity. Conversely, when the output capacity B1 from the rectifiers 20a, 20b, ……, 20n is surplus, the storage battery 50 is charged with this surplus capacity. That is, the total capacity ΣB output from the rectifiers 20a, 20b, ……, 20n is the product of the capacity C per rectifier 20a, 20b, ……, 20n and the number of operating rectifiers 20a, 20b, ……, 20n, i (ΣB = C × i). This ΣB is the output capacity B1 by the DC current measured by the current measuring device 21 and is supplied to the servers 10a, 10b, ……, 10n. On the other hand, when the load capacity B2 required by the servers 10a, 10b, ……, 10n is larger than the output capacity B1, the load capacity B2 of the servers 10a, 10b, ……, 10n will be insufficient. Therefore, the charging capacity B3 is discharged from the storage battery 50 to compensate for this difference (B2 - B1). On the other hand, when the load capacity B2 of the servers 10a, 10b, ……, 10n is smaller than the output capacity B1, there will be a surplus in the output capacity B1, and this surplus will be the charging capacity B3 used for charging the storage battery 50.

[0024] Then, the measured values of the current measuring device 21, the current measuring device 22, and the current measuring device 23 arranged on the rectifier panel 20 are supplied to the PLC2. Also, information regarding the operating states of the rectifiers 20a, 20b, ……, 20n is exchanged with the PLC2. Note that the operation and stop of the rectifiers 20a, 20b, ……, 20n are to be performed by opening and closing the electromagnetic switches 31a, 31b, ……, 31n. However, when the rectifiers 20a, 20b, ……, 20n have built-in switches, it can be performed by these built-in switches. In this case, an opening / closing signal for operating the switches built into the rectifiers 20a, 20b, ……, 20n is sent from the PLC2.

[0025] Then, the PLC2 is connected to a management device 4 for performing control and management such as a management center via the network 3, and information is exchanged between the management device 4 and the PLC2.

[0026] In the power supply device management system configured as described above, the operating states of the rectifiers 20a, 20b, ……, 20n are monitored based on the information provided to the PLC2. Based on the currents measured by the ammeters 33a, 33b, ……, 33n, it is detected which of the rectifiers 20a, 20b, ……, 20n is in the operating state or which is in the stopped state. The output capacity B1 of the rectifiers 20a, 20b, ……, 20n in the operating state is measured by the current measuring device 21. Also, the load capacity B2 for operating the servers 10a, 10b, ……, 10n is measured by the current measuring device 22, and these measured values are sent to the PLC2. In the PLC2, based on these measured values, the difference between the output capacity B1 and the load capacity B2 is obtained. Further, the number of operating rectifiers 20a, 20b, ……, 20n required to obtain the output capacity B1 is adjusted so that it is necessary to supply the load capacity B2 and the rectifiers 20a, 20b, ……, 20n can be operated with high efficiency. That is, the load capacity B2 of the servers 10a, 10b, ……, 10n is ensured, and the PLC2 determines the number of operating rectifiers 20a, 20b, ……, 20n required for the rectifiers 20a, 20b, ……, 20n to operate with high efficiency. By operating the rectifiers 20a, 20b, ……, 20n of the obtained number, the rectifiers 20a, 20b, ……, 20n can be operated efficiently. That is, conventionally, based on the actual load, the number of operating rectifiers 20a, 20b, ……, 20n that are installed and operating based on the rated load of the servers 10a, 10b, ……, 10n can be reduced, and the operating rectifiers 20a, 20b, ……, 20n can be operated with high efficiency. For this reason, the number of rectifiers 20a, 20b, ……, 20n to be installed in advance can be reduced to cut the equipment cost, and moreover, the energy efficiency can be improved. For example, as described above, when three rectifiers 20 are each operating at 30% power, if one rectifier 20 is operated at 90% power, the operating rectifier 20 can be operated with high efficiency and the power consumption can be reduced. Also, by reducing the number of operating rectifiers 20, the loss of power consumption at no load can be reduced.

[0027] Also, since the PLC2 monitors the operating states of the rectifiers 20a, 20b, ……, 20n, when any of the rectifiers 20a, 20b, ……, 20n fails, the rectifier 20a, 20b, ……, 20n related to the failure can be quickly identified. Also, from the measured values of the current measuring instruments 33a, 33b, …… 33n, it is possible to quickly identify that a power outage has occurred, and by discharging from the storage battery 50, the operation of the servers 10a, 10b, ……, 10n can be continued. Also, when the operation of the servers 10a, 10b, ……, 10n becomes overloaded, discharge from the storage battery 50 and, if necessary, operate the rectifiers 20a, 20b, ……, 20n that are stopped and connect them to the power supply.

[0028] Figures 2 and 3 show schematic flowcharts for the case where, by monitoring the PLC2, when a rectifier fails, during a power outage, or when the rectifiers to be operated are changed at regular intervals for cyclic operation. Note that, in the state where the electromagnetic switches 31c, 31n with diagonal lines among the electromagnetic switches 31a, 31b, ……, 31n in Fig. 1 are open and the current is interrupted, the rectifiers 20c, 20n connected to these electromagnetic switches 31c, 31n are in a non-operating state and are waiting to be connected. In the PLC2, the rectifier input control during failure / cyclic operation (step 201) shown in Fig. 2 and the rectifier number control (step 301) shown in Fig. 3 are executed. Note that, as conditions for the rectifier number control, assume the restoration of power after a power outage, rectifier failure, battery charging, and sudden increase in load. Also, the rectifier input control during failure / cyclic operation (step 201) and the rectifier number control (step 301) are linked, and information about the content of the executed control is exchanged with each other.

[0029] During a fault or rotation, in the rectifier input control (step 201), the presence or absence of a rectifier fault is monitored (step 202). This rectifier fault monitoring is performed for the rectifiers (rectifiers 20a, 20b, 20d in Fig. 1) that should be operating at that time. If it is determined that the rectifiers 20a, 20b, 20d that should be operating are not operating (step 202 / YES), the faulty rectifier is disconnected, and a stopped rectifier (rectifiers 20c, 20n in Fig. 1) is input in place of the faulty rectifier (step 203). Thereafter, PLC2 notifies the management center, etc. of the fault information (step 204). If the monitored rectifier is operating (step 202 / NO), it is determined whether the operating time of the rectifier has elapsed the set time (step 205). If the operating time has not elapsed the set time (step 205 / NO), it returns to step 202 to monitor the rectifier fault. On the other hand, if the operating time has elapsed the set time (step 205 / YES), the rectifier with the smaller operating time among the stopped rectifiers 20c, 20n is input (step 206). That is, rotation control is performed to exchange the rectifiers to be operated at regular intervals. For the rectifier input in place of the rectifier that failed in step 203, in step 205, it is determined whether the operating time has elapsed. If the operating time has not elapsed a certain time, the fault determination is executed in step 202. Also, for the rectifier disconnected in step 203, it is repaired or replaced with a new rectifier.

[0030] The rectifier number control (step 301) shown in Fig. 3 shows the cases of charging the battery 50 and discharging from the battery 50.

[0031] When charging the battery 50, it is necessary to make the output capacity B1 larger than the load capacity B2, that is, Rectifier output capacity B1 ≥ Load capacity B2 + Battery charging capacity B3 (Equation 1) Control is performed so as to achieve this. That is, control is carried out to operate the rectifiers 20a, 20b, ……, 20n such that the output capacity B1 in the current measurement device 21 is larger than the sum of the load capacity B2 in the current measurement device 22 and the charging capacity B3 in the current measurement device 23. Charging of the storage battery 50 is started by the rectifiers (rectifiers 20a, 20b, 20d in FIG. 1) during operation (step 311). It is determined whether or not this charging time exceeds 1C (step 312). This “1C” indicates charging in one hour, and it is preferable that this time can be arbitrarily set within a range such as 0.1 to 1.0, for example. When the charging time exceeds 1C (step 312 / YES), it means that (Equation 1) is not satisfied even when the charging time exceeds 1C, because the surplus capacity for charging the storage battery 50 in the output capacity B1 is not sufficient. For this reason, the first rectifier that is stopped (for example, rectifier 20c in FIG. 1) is turned on (step 313), and charging of the storage battery 50 is started and the charging time is monitored, and it is determined whether or not the charging time exceeds 1C (step 314). When the charging time exceeds 1C (step 314 / YES), since (Equation 1) is not satisfied, the second rectifier (for example, rectifier 20n in FIG. 1) is turned on (step 315), charging is started, the charging time is monitored, and it is determined whether or not the charging time exceeds 1C (step 316). When the charging time exceeds 1C (step 316 / YES), since (Equation 1) is not satisfied, the third rectifier (for example, rectifier 20n + 1) is turned on (step 317), charging is started, the charging time is monitored, and it is determined whether or not the charging time exceeds 1C (step 318). When the charging time exceeds 1C (step 318 / YES), since (Equation 1) is not satisfied, the Nth rectifier (for example, rectifier 20n + i) is turned on (step 319), and the charging state is monitored. The number of rectifiers to be put into operation is sequentially increased, and it is monitored whether the charging time exceeds 1C, and control is performed so as to satisfy (Equation 1). When (Equation 1) is satisfied, the determinations in Steps 213, 314, 316, and 318 become "NO". That is, it is recognized that (Equation 1) is satisfied at the point in time when the charging time does not exceed 1C at this point. When it is determined as "NO", as described above, the determination is made in order from the case where the number of rectifiers put into operation is small, and when it is determined as "NO", a new rectifier is not put into operation. In this state, the storage battery 50 is fully charged, and when it is necessary to discharge from this storage battery 50, it will be possible to quickly respond.

[0032] If the above (Equation 1) is satisfied, since the storage battery 50 has reached a predetermined capacity and charging is completed, the operating state, operating time, failure information, etc. of the rectifier are monitored (Step 330). Then, by monitoring the operating state etc. of this rectifier, the control at the time of a failure etc. described above (Step 201) will be executed.

[0033] In the event of a power outage, a rectifier failure, a sudden increase in load, etc., it is necessary to discharge from the storage battery 50 to ensure a sufficient load capacity B2, so the storage battery 50 is discharged. The discharge of the storage battery 50 is used as temporary, and the stopped rectifiers 20a, 20b,..., 20n are operated to make the output capacity B1 of the rectifier larger than the load capacity B2 to cope with a sudden increase in the load capacity, etc. That is, Rectifier output capacity ≥ Load capacity (Equation 2) Control is performed so as to satisfy this. For the rectifier in operation (Step 321), the discharge of the storage battery 50 is started, and it is determined whether or not there is discharge (Step 322). At this time, if the storage battery 50 has been discharged (Step 322 / YES), since (Equation 2) is not satisfied, that is, if the storage battery 50 is not discharged, the load capacity cannot be ensured, so the first stopped rectifier (for example, the rectifier 20c in FIG. 1) is turned on (Step 323), and at the same time, the discharge of the storage battery 50 is started, and it is determined whether or not there is discharge (Step 324). When the discharge continues (step 324 / YES), since the load capacity B2 is larger than the output capacity B1 and (Equation 2) is not satisfied, the second rectifier (for example, rectifier 20n in FIG. 1) is turned on (step 325), and at the same time, the discharge of the storage battery 50 is started, and the presence or absence of discharge is determined (step 326). When the discharge continues (step 326 / YES), the third rectifier (for example, rectifier 20n + 1) is turned on (step 327), and at the same time, the discharge of the storage battery 50 is started, and the presence or absence of discharge is determined (step 328). When the discharge continues (step 328 / YES), since (Equation 2) is not satisfied, the Nth rectifier (for example, rectifier 20n + i) is turned on (step 329), and the discharge of the storage battery 50 is started. By sequentially increasing the number of rectifiers turned on in this way, when there is no discharge from the storage battery 50, that is, when (Equation 2) is satisfied, the determinations in steps 322, 324, 326, and 328 become "NO". That is, it is recognized that there is no discharge from the storage battery 50 and (Equation 2) is satisfied.

[0034] If the above (Equation 2) is satisfied, since the output capacities B1 of the rectifiers 20a, 20b,..., 20n are larger than the load capacities B2 of the servers 10a, 10b,..., 10n, the operating state, operating time, failure information, etc. of the rectifiers are monitored (step 330). Then, by monitoring the operating state, etc. of this rectifier, the control at the time of a failure, etc. (step 201) described above will be executed.

[0035] FIG. 4 shows a system in which a plurality of DC power supply units 60a, 60b, ..., 60n, each consisting of servers 10a, 10b, ..., 10n, rectifiers 20a, 20b, ..., 20n, and a storage battery 50 shown in FIG. 1, are installed. Each of the DC power supply units 60a, 60b, ..., 60n is provided with a server 10 (10a, 10b, ..., 10n), rectifiers 20a, 20b, ..., 20n, a switchboard 30, and a storage battery 50. The switchboard 30 is supplied with power from an AC power source. In addition, a PLC 2 is arranged in each of these DC power supply units 60a, 60b, ..., 60n in the same manner as in the embodiment shown in FIG. 1, and information such as the open / closed states of the electromagnetic switches 31a, 31b, ..., 31n in the switchboard 30, the operation and stop of the rectifiers 20a, 20b, ..., 20n in the rectifier panel 20, and the charge capacity of the storage battery 50 is exchanged with the PLC 2. Further, this PLC 2 is connected to a management device 4 (see FIG. 1) such as a management center via a network 3 (see FIG. 1). And the respective circuits 40 of the DC power supply units 60a, 60b, ..., 60n are connected to a DC bus 42.

[0036] The measured values measured for each of the DC power supply units 60a, 60b, ..., 60n and provided to the PLC 2 are provided to the management device 4. The management device 4 monitors the operating states of the rectifiers 20a, 20b, ..., 20n of the DC power supply units 60a, 60b, ..., 60n from the operating states of the respective DC power supply units 60a, 60b, ..., 60n, and adjusts the number of operating rectifiers 20a, 20b, ..., 20n so that all the rectifiers 20a, 20b, ..., 20n of the DC power supply units 60a, 60b, ..., 60n operate with high efficiency. At this time, power is exchanged between the DC power supply units 60a, 60b, ..., 60n via the DC bus 42 so that all the rectifiers 20a, 20b, ..., 20n of the DC power supply units 60a, 60b, ..., 60n operate with high efficiency. As a result, for any of the DC power supply units 60a, 60b, ……, 60n, the rectifiers 20a, 20b, ……, 20n can be operated in an appropriate number with respect to the load capacity, and the power consumption can be made in an appropriate state.

[0037] As described above, according to the power supply device management system according to the present invention, by appropriately setting the number of rectifiers according to the load during operation, the rectifiers can be operated with high efficiency and contribute to the reduction of power consumption.

Explanation of symbols

[0038] 1 AC power supply 2 PLC 3 Network 4 Management device 10a, 10b, ……, 10n Servers 20 Rectifier panel 20a, 20b, ……, 20n Rectifiers 21 Current measurement device 22 Current measurement device 23 Current measurement device 30 Switchboard 31a, 31b, ……, 31n Electromagnetic switches 33a, 33b, ……33n Current measuring instruments 35 Main switchboard 40 Circuit 42 DC bus 50 Battery 60a, 60b, ……, 60n DC power supply units

Claims

1. A power supply device management system for controlling a power supply device comprising a plurality of rectifiers connected in parallel and a storage battery charged by the outputs of these rectifiers, information about the operating state of each of the plurality of rectifiers, the output capacity output from the plurality of rectifiers, the load capacity for operating the load-side device, the state of the switch for switching the conduction / non-conduction of the current supplied to each of the plurality of rectifiers, and the charge capacity of the storage battery, are input to a programmable logic controller (PLC), and based on the load capacity, the number of operating rectifiers is adjusted to control the number of operating rectifiers so as to achieve high operating efficiency, when the output capacity is greater than the load capacity, charging of the storage battery is performed, and when the output capacity is less than the load capacity, discharging of the storage battery is performed, in the charging of the storage battery, the charging time is monitored, and when charging is started and the predetermined charging time is exceeded, the stopped rectifier is operated to perform charging, and control is performed so that the output capacity of the rectifier exceeds the total capacity of the load capacity and the storage battery charging capacity, A power supply device management system characterized by the above.

2. The power supply device management system according to claim 1, the PLC is connected to a centralized management center via a network, and based on the measured values sent from the PLC, management is performed at the centralized management center, a control signal for the rectifier is sent to the PLC, and the PLC controls the number of operating rectifiers based on this control signal. A power supply device management system characterized by the above.

3. Combining a DC power supply device unit comprising a plurality of rectifiers connected in parallel and a storage battery charged by the outputs of these rectifiers, connecting a plurality of the DC power supply device units by bus wiring, for each DC power supply device unit, the power of the AC power supply input to the plurality of rectifiers, information about the operating state of each of the plurality of rectifiers, the output capacity output from the plurality of rectifiers, the load capacity for operating the load-side device, the state of the switch for switching the conduction / non-conduction of the current supplied to each of the plurality of rectifiers, and the charge capacity of the storage battery, Input it into a programmable logic controller (PLC), and based on the load capacity, adjust the number of operating rectifiers between the DC power supply units to control the number of operating units so as to achieve high operating efficiency of the rectifier. When the output capacity is greater than the load capacity, charge the battery. When the output capacity is less than the load capacity, discharge the battery. During the charging of the battery, monitor the charging time. If charging has started and exceeds a predetermined charging time, operate the stopped rectifier to perform charging, and control it so that the output capacity of the rectifier exceeds the total capacity of the load capacity and the battery charging capacity. A power supply device management system characterized by the above.

4. The power supply device management system according to claim 3, each of the PLCs of the DC power supply units is connected to a centralized management center via a network, and managed at the centralized management center based on the information sent from each of the PLCs, and a control signal for the rectifier is sent to each PLC, and the PLC controls the number of operating rectifiers of the rectifier based on this control signal. A power supply device management system characterized by this.

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