JP2011139556A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a power supply system including an AC power system and a DC power system, while suppressing power consumption. <P>SOLUTION: The power supply system includes an AC power system, a plurality of rectifiers connected with the AC power system to convert the AC power of the AC power system into DC power within a set range; and a DC power system supplied with DC power from a plurality of inverters and DC power from a solar generator, a wind generator, or a hydraulic generator. The larger number of rectifiers are driven as power consumption of loads connected with the DC power system to consume DC power is increased. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply system having an AC power supply system and a DC power supply system.

  The power transmission system is depressurized from a high-voltage (for example, 6000V system or 3000V system) power transmission system to a three-phase 400V system, a three-phase 200V system, or a single-phase 100V system for home wiring via a substation (down transformer). Used as a power source. A large number of equipment electric machines, industrial electric machines, and household electric machines driven by a motor are connected to these power supply systems as loads. These motors are often driven by inverters.

  Currently, as global efforts to the global warming issue progress, effective utilization of unused natural energy with less environmental impact and less resource constraints is required. From such a background, solar power generation, hydroelectric power generation, wind power generation and the like are used. These generated electric powers are connected to the aforementioned power supply system and used. As prior arts, there are those shown in the following prior art documents.

  These are organized and described with reference to FIG. Reference numeral 1 denotes a three-phase 400V power supply system. For example, a starter 100, a motor 101, and a pump 102 are connected to the branch power supply 1a to supply power. Further, the inverter 103, the motor 104, and the pump 105 are connected from the branch power source 1b, and the inverter 106, the motor 107, and the blower 108 are connected to the branch power source 1c to supply power.

  Reference numeral 2 denotes a three-phase 200V power supply system. For example, a circuit breaker 200, an electromagnetic switch 201, a motor 202, and a pump 203 are connected to the branch power supply 2f. Further, the inverter 204, the motor 205, and the pump 206 are connected from the branch power source 2d, and the inverter 207, the motor 208, and the blower 209 are connected from the branch power source 2e, respectively, and power is supplied.

  Reference numeral 3 denotes a single-phase 100V household power supply system, which supplies power to the household load group 300 from, for example, a branch power supply 3a.

  On the other hand, the electric power generated by the natural energy source includes, for example, a wind turbine 112, a generator 111 that is driven to generate power, a controller 110 that controls the generator to generate power and outputs the DC, and a DC output of the controller is an AC power source. This AC output is connected to the 400V power supply system 1d through a grid interconnection inverter 109 that outputs to the system.

  Another windmill 213 includes a generator 212 that is driven to generate power, a controller 211 that performs power generation control of the generator and outputs the direct current, and a grid-connected inverter 210 that outputs the DC output of the controller to an AC power supply system. The AC output is connected to the 200V power supply system 2a.

  Similarly, a water turbine 217, a generator 216 that drives and generates electric power, a controller 215 that controls the generator to generate electric power and outputs it in a direct current, and a grid interconnection inverter 214 that outputs the direct current output of the controller to an alternating current power supply system are provided. The AC output is connected to the 200V power supply system 2b. Similarly, the solar panel 219 is used with this AC output connected to the 200 V power supply system 2 c via the power conditioner 218. Further, for example, another solar panel 801 is used by connecting this AC output to the single-phase 100 V household power supply system 3 a via the power conditioner 800.

  As described above, many load groups are driven by inverters. Generally speaking, this inverter is composed of a converter that converts a three-phase AC power source into a DC and an inverter that converts the converted DC to a desired AC again, reducing power conversion efficiency and consuming power. It is also a factor.

JP 2000-19727 JP 2003-116218 A JP-A-6-274233 JP 2009-153301 A JP 2009-144203 JP-A-2002-515197

  In the above-mentioned prior art power supply system, there is no unified idea to construct a DC power supply system according to the load group and to use power efficiently and effectively, and there is no movement to standardize and standardize so far . For this reason, there is a conversion loss in the entire system, and power consumption cannot be suppressed. It is an object of the present invention to construct a power feeding system composed of an AC power supply system and a DC power supply system while suppressing power consumption.

  According to an embodiment of the present invention, a plurality of AC power supply systems and a predetermined AC power supply system among the plurality of AC power supply systems are connected, and the AC power of the predetermined AC power supply system is a direct current within a first setting range. DC power from a first forward conversion device that converts power, DC power from the first forward conversion device, and first solar power generation device, first wind power generation device, or first hydroelectric power generation device Are connected to a predetermined AC power supply system among a plurality of AC power supply systems, and the AC power of the predetermined AC power supply system is DC power within the second setting range. DC power from the second forward converter, the second forward converter, and the second solar power generator, second wind power generator, or second hydroelectric generator. And a second DC power supply system configured to be supplied.

  In the above aspect, the first solar power generation device, the first wind power generation device, or the first hydraulic power generation device is provided between the first DC power supply system and the first solar power generation device, the first wind power generation device, and the first DC power supply system. And a second solar power generation device, a second wind power generation device, or a second hydroelectric power generation device, and a second DC power supply system, and a second DC power supply system that cuts off the respective connections. When the first solar power generation device, the first wind power generation device, or the first hydroelectric power generation device is on standby, the first opening / closing device is opened and the standby power generation device is connected to the standby power generation device. When the second solar power generation device, the second wind power generation device, or the second hydraulic power generation device is on standby, the second opening / closing means is opened to disconnect the connection with the standby power generation device. It is desirable.

  According to another embodiment, an AC power supply system, a forward conversion device that is connected to the AC power supply system and converts AC power of the AC power supply system into DC power within a set range, and DC power from the reverse conversion device, A DC power supply system configured to be supplied with DC power from a solar power generation apparatus, a wind power generation apparatus, or a hydropower generation apparatus, a solar power generation apparatus, a wind power generation apparatus, or a hydropower generation apparatus, and a DC power supply system Open / close means for cutting off the respective connections, and when the solar power generator, wind power generator, or hydroelectric generator is on standby, open the open / close means and Disconnect the connection.

  Further, in the above aspect, a load that is connected between the AC power supply system and the DC power supply system, converts the DC power of the DC power supply system into AC power, and is connected to the DC power supply system and consumes DC power. When the power consumption of the group is less than or equal to a predetermined value, it is desirable to convert the DC power of the DC power supply system to AC power via an inverse converter and return it to the AC power supply system.

  Furthermore, the power source used for controlling the forward conversion device and the forward conversion device that forms direct-current power from the generated power of the photovoltaic power generation device, the wind power generation device, or the hydroelectric power generation device, or the reverse conversion device and the reverse conversion device. It is desirable to use DC power commonly connected to DC power from a DC current system.

  Further, it is desirable to provide a second opening / closing means for cutting off the connection between the inverse conversion device and the AC power supply system, and to close and connect the second opening / closing means when power is fed back to the AC power supply system.

  Furthermore, a third opening / closing means for cutting off the connection between the forward conversion device and the AC power supply system is provided, and when the electric power is fed back to the AC power supply system, the second opening / closing means is closed and connected. It is desirable to open the connection and block the connection.

  According to another embodiment, an AC power supply system, a plurality of forward conversion devices that are connected to the AC power supply system and convert AC power of the AC power supply system into DC power within a set range, and a plurality of reverse conversion devices A load that is connected to the DC power supply system and consumes the DC power, the DC power supply system configured to be supplied with DC power and DC power from a photovoltaic power generator, a wind power generator, or a hydroelectric generator As the power consumption of the group increased, the number of forward converters to be driven increased.

  According to still another embodiment, an AC power supply system, a forward conversion device that is connected to the AC power supply system and converts AC power of the AC power supply system into DC power within a set range, and DC power from the reverse conversion device, A DC power supply system configured by being supplied with DC power from a solar power generation device, a wind power generation device, or a hydroelectric power generation device, and connected between the AC power supply system and the DC power supply system, A plurality of inverse conversion devices that convert electric power into alternating current power; and a solar power generation device, a wind power generation device, or hydraulic power for power consumption of a load group that is connected to a direct current power supply system and consumes direct current power The greater the DC power generated by the power generator, the greater the number of reverse converters that are driven.

  In any of the above aspects, when the load connected to the DC power supply system is an inverter, the AC power supply terminal of the inverter is connected to the AC power supply system via a switch, and the DC power supply terminal of the inverter is connected via a switch. By connecting to a DC power supply system and switching the switch, it can be operated with either AC power or DC power.

  According to the above embodiment of the present invention, conversion loss is reduced as a whole system, and power saving and energy saving are possible.

1 is a system diagram of the first embodiment. The system system | strain diagram in Example 2. FIG. FIG. 10 is a system diagram of the third embodiment. FIG. 10 is a system diagram of the fourth embodiment. FIG. 10 is a system diagram of the fifth embodiment. FIG. 10 is a system diagram of the sixth embodiment. The figure for demonstrating a prior art.

Embodiment 1 of the present invention will be described below with reference to the drawings. In this embodiment, local small-scale power generation such as wind power generation, hydroelectric power generation, and solar power generation is called a distributed power source.
FIG. 1 shows a system diagram in this embodiment. 1 is a 400V class three-phase AC power supply system, 3 is a 200V class three-phase AC power supply system, and 4 is a 100V class single-phase AC power supply system. Reference numeral 2 denotes a DC power supply system, for example, for 240V to 350V industrial use, and reference numeral 5 denotes a DC power supply system, for example, for 140V to 200V home appliances. A local area where a transmission distance such as one building or factory is not so long is preferable. This DC power supply system is used in common. Reference numeral 6 denotes a converter (forward conversion device) that converts an alternating current composed of a power diode or the like into a direct current. The primary side (input) is connected to the branch power supply 1a of the three-phase alternating current power supply system, and the secondary The side (output) is connected to the branch power supply 2a of the DC power supply system. Thus, a DC power supply system, for example, 240V to 350V industrial use is generated from the 400V class three-phase AC power supply system. Similarly, reference numeral 7 denotes a converter (forward conversion device), which is the same as 6 described above, and will not be described in detail. ) To the branch power supply 5a of the DC power supply system. Thus, a DC power supply system, for example, 140V to 200V home appliances is generated from the 400V class three-phase AC power supply system.

  Reference numeral 9 denotes a converter (forward conversion device), which has a primary side (input) connected to a branch power source 3a of a 200V class three-phase AC power supply system and a secondary side (output) connected to a branch power source 2c of a DC power source system. . Thus, a DC power supply system, for example, 240V to 350V industrial use is generated from the 200V class three-phase AC power supply system. Similarly, 10 is a converter (forward conversion device), and the primary side (input) is connected to the branch power supply 3b of the 200V class three-phase AC power supply system, and the secondary side (output) is connected to the branch power supply 5b of the DC power supply system. To do. As a result, a DC power supply system, for example, 140V to 200V home appliances is generated from the 200V class three-phase AC power supply system. Reference numeral 12 denotes a converter (forward conversion device), which has a primary side (input) connected to a branch power supply 4a of a 100 V class single-phase AC power supply system and a secondary side (output) connected to a branch power supply 5g of a DC power supply system. . As a result, a DC power supply system, for example, 140V to 200V home appliances is generated from the 100V class single-phase AC power supply system. For this, if nighttime power is used, the economy is further improved.

  8 is a system interconnection inverter, which is composed of a power transistor or the like, converts a direct current that conforms to the regulations of the electric power company into an alternating current, and returns it to the alternating current power supply system. The secondary side (output) is connected to the branch power supply 1c of the 400V class AC power supply system. Similarly, 11 is a system interconnection inverter, and the primary side (input) is connected to the branch power supply 5d of the DC power supply system, and the secondary side (output) is connected to the branch power supply 3c of the 200V class AC power supply system. Further, reference numeral 13 denotes a system interconnection inverter. The primary side (input) is connected to the branch power source 5h of the DC power source system, and the secondary side (output) is connected to the branch power source 4b of the 100V class single-phase AC power source system. As will be described later, the power generated and surplus in the load group is returned to the AC power supply system for use.

  112 is a windmill that is rotationally driven by wind energy, 111 is a generator that is driven by this windmill and outputs AC power, 110 is a DC power supply system 2 (for example, DC 240-240) by appropriately controlling the AC power output by this generator 350V) is a generator controller (converts alternating current into direct current). This generator controller has an input side connected to the cable 111a of the generator 111 and an output side connected to the branch power source 2d of the DC power source system 2. Similarly, 217 is a water wheel that is rotationally driven by hydraulic energy, 216 is a generator that is driven by this water wheel and outputs alternating current power, and 215 is an AC power output from this generator that is appropriately controlled to direct current power supply system 2. This is a generator controller (converts alternating current into direct current) and has the same function as 2 described above. This generator controller has an input side connected to the cable 216a of the generator 216 and an output side connected to the branch power source 2e of the DC power supply system 2. Further, reference numeral 213 denotes a windmill that is rotationally driven by wind energy, 212 is a generator that is driven by the windmill and outputs AC power, and 211 is a DC power supply system 5 (for example, appropriately controlling the AC power output by the generator) It is a generator controller (converts alternating current into direct current) to output to DC140-200V). The generator controller has an input side connected to the generator 212 cable 212 a and an output side connected to the branch power source 5 a of the DC power supply system 5. Further, reference numeral 219 denotes a solar panel, and the output thereof is connected to the branch power supply 2 f of the DC power supply system 2. 223 is also a solar panel, and the output thereof is connected to the branch power source 5e of the DC power source system 5. A load group 218 for industrial use is connected to the DC power source 2, and a load group 224 for home appliances is connected to the DC power source 5.

  In this way, a plurality of AC power supply systems, a DC power supply system generated from them by a forward converter (converter), and a DC power supply system generated by a distributed power supply (solar power generation, wind power generation, hydroelectric power generation, etc.) A DC power supply system is constructed, and a plurality of DC power supply system voltages are provided for each load group. Each of the plurality of DC power supply systems based on these voltages is associated with each of the plurality of AC power supply systems and the forward converter ( It is constructed with a DC power supply system generated by a converter and a DC power supply system generated by a distributed power supply, and these DC power supply system voltages are unified into industrial and home appliances.

  As described above, in this embodiment, a plurality of DC power supply system voltages are provided in accordance with a load group (for example, for industrial use and for home appliances), and these corresponding DC power supply systems are connected to a forward converter (from a plurality of AC power supply systems). Converter) and multiple distributed power supply systems, which are built and unified, not only reduce conversion loss and save power and energy, but also unify (industrial DC power supplies, DC power supplies for household appliances) As a result, the number of dedicated loads connected to the DC power supply system increases, standardization of load products advances, and it becomes easier to use and leads to lower prices.

  Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 2 shows a system diagram of this embodiment. The devices denoted by the same reference numerals as those in FIG. 1 are the same devices and the description of the same functions and performances is omitted. As shown in FIG. 1, in this embodiment, a switch 300 is connected between the input side of the converter 6 and the branch power source 1a of the AC power supply system 1, and the output side of the grid interconnection inverter 8 and the AC power supply system. A switch 301 is connected to one branch power supply 1c. Further, a switch 302 is connected between the output side of the wind power generator controller 110 and the branch power source 2d of the DC power source system 2, and similarly, between the output side of the hydro power generator controller 215 and the branch power source 2e of the DC power source system 2. And a switch 304 is connected between the output side of the photovoltaic power conditioner 218 and the branch power supply 2 f of the DC power supply system 2.

  For example, an industrial load group 218 is connected to the DC power supply system 2. These devices and the load group 218 described above are controlled and operated by the control device 305. In addition, the wind power generator controller 110, the hydroelectric power generator controller 215, and the solar power generation power conditioner 218 respectively send state signals S1, S2, and S3 indicating whether they are in operation or in standby according to the respective states. To the control device 305. The load group 218 includes a signal S4 indicating the operating state of the load, and transmits the signal to the control device 305 according to the operating state of the load.

  And the control apparatus 305 is provided with the receiving part which receives said signal S1, S2, S3, S4, and performs control based on these signals. In other words, the control device 305 is a device that controls the operation of the AC power supply system and the DC power supply system, and corresponds to this when the standby signal is received from the signals S1, S2, and S3 transmitted from 110, 215, and 218. A signal for opening the switches 302, 303, and 304 is output and opened. That is, the switch 302 is opened if the waiting signal is S1, the switch 303 is opened if S2, and the switch 304 is opened if S3. Of course, these may be combined. Further, the control device 305 opens the switch 300 provided in the front stage of the forward conversion device (converter) 6 that generates the DC power supply system 2 from the AC power supply system 1 when the state signal from the load group 306 takes in the surplus signal S4. Then, a control output for closing the switch 301 provided in the preceding stage of the inverse converter (inverter) 8 that feeds back from the DC power supply system to the AC power supply system is output. In this way, standby power is reduced.

  As described above, in this embodiment, each forward conversion device, reverse conversion device, and distributed power source are provided with switches, and these switches are appropriately opened according to the load state (load factor). Standby power is reduced and power is saved.

The third embodiment of the present invention will be described below with reference to the drawings.
FIG. 3 shows a system diagram of this embodiment. The present embodiment is a further improvement of the second embodiment, and the devices denoted by the same reference numerals as those in FIGS. 1 and 2 are the same devices and exhibit the same functions and performances, and thus the description thereof is omitted. FIG. 3 is different from FIG. 2 in that the DC power supply system 2 is a control power supply, and a cable 310 drawn therefrom is connected to each forward conversion device (converter) and each reverse conversion device (system connection) via the control power supply open / close switch SW. System inverter), each wind power generation controller (forward conversion device), each hydropower generation controller (forward conversion device), photovoltaic power conditioner, and control power supply terminals D0 and D1 of the load group. . In this way, the control power supply is common to the DC power supply system, and the conversion loss is smaller than when a DC control power supply is individually generated from the AC power supply. Further, in the second embodiment, it is necessary to prepare an internal control power source when the switch is opened for each device by a storage battery or the like, but it is common and simple.

  As described above, in this embodiment, since the control power supply is made common to the DC power supply, the conversion loss when generating the control power supply (usually generated by smoothing the DC from the AC power supply system) is reduced, Since the control is separated, the reliability becomes higher.

Embodiment 4 of the present invention will be described below with reference to the drawings.
FIG. 4 shows a system diagram of this embodiment. The devices denoted by the same reference numerals as those in FIGS. 1, 2, and 3 are the same devices and have the same functions and performances, and thus description thereof is omitted. FIG. 4 shows a forward converter (converter) that generates a DC power supply system from an AC power supply system in FIG. For example, it is assumed that the power from the distributed power supply is not expected in consideration of the worst condition, and the load group covers 100% with the DC power supply system generated by the forward converter (converter). Load conversion factor (converter) 6-1 (load factor 50% share), forward converter (converter) 6-2 (load factor 20% share), forward A converter (converter) 6-3 (30% load factor) is installed in parallel. Here, the load of 100% is a value that varies depending on the load group. Here, 50%, 20%, and 30% are set, but the present invention is not limited to this. The forward conversion device described above includes receiving terminals T1, T2, and T3 that receive drive command signals S11, S12, and S13 from the control device 305, respectively.

  The load group 218 includes an output terminal that transmits a load state signal S14 according to the load state (for example, a load factor), and the load state signal S14 is output to the control device 305. When receiving the load state signal S14 transmitted from the load group 218, the control device 305 performs the following control according to the load factor indicated by this signal. That is, assuming that the load factor is 20% or less from S14, the forward conversion device (converter) 6-2 is driven. Thereby, since it is not necessary to drive 6-1 and 6-3, drive efficiency improves and conversion loss can be reduced.

  Similarly, if the load factor exceeds 20% and is 30% or less, the forward conversion device (converter) 6-3 is driven, and if it exceeds 30% and 50% or less, the forward conversion device (converter) 6-1 is driven. If the load factor exceeds 50% and is 70% or less, the forward converters (converters) 6-1 and 6-2 are driven. If the load factor exceeds 70% and is 80% or less, the forward converters (converter) 6- 6 are driven. Drives 1 and 6-3. And when it exceeds 80% and becomes 100% or less, all of the three forward converters (converters) 6-1, 6-2, and 6-3 are driven. These forward conversion devices are driven by outputting drive command signals S11, S12, and S13 from the control device 305, and as described above, these signals are output alone or in combination as appropriate, so that only the necessary number of units are output. I try to drive it.

  Note that the forward conversion device (converter) may be installed in a distributed manner by appropriately changing the load factor. In this way, the forward converters (converters) distributed according to the load factor are connected to the AC power supply system to control the number of units, so that the forward converters (converters) that are not connected are improved in driving efficiency. Conversion loss is also reduced without becoming a load on the power supply system.

  Moreover, if the same load factor is installed in parallel as a spare for the forward conversion device (converter) 6-1, the reliability becomes higher. Specifically, a drive command signal for driving them alternately may be output.

  As described above, in this embodiment, the forward converters (converters) that generate the DC power supply system from the AC power supply system are dispersed and installed between them, and the number of units is controlled according to the load state (load factor). Reasonable operation is possible, conversion loss is reduced, and energy is further saved. In addition, when a spare is provided as appropriate and distributed, the reliability of the system increases.

Embodiment 5 of the present invention will be described below with reference to the drawings.
FIG. 5 shows a system diagram of this embodiment. The devices denoted by the same reference numerals as those in FIGS. 1 to 4 are the same devices and have the same functions and performances, and thus description thereof is omitted. As shown in FIG. 5, in this embodiment, a plurality of inverse conversion devices (system-connected inverters) that feed back power from the surplus DC power supply system to the AC power supply system with respect to FIG. 1 are provided between the DC power supply system and the AC power supply system. Distributed and installed.

  For example, when the power consumption at the load is set to 0 in consideration of the worst condition, 100% of the generated power from the distributed power source is returned to the AC power source by one inverse converter (system-connected inverter). In the surplus power state from the generated power and the load state of the load group, it is distributed at 50%, 20%, and 30%. That is, the reverse conversion device (system interconnection inverter) 8-1 (sharing of the surplus rate 50%), the reverse conversion device (system connection inverter) 8-2 (sharing of the surplus rate 20%), the reverse conversion device (system connection inverter) ) 8-3 (30% share of surplus rate) is installed in parallel.

  Each of these inverse conversion devices is provided with receiving terminals T10, T11, T12 for receiving drive command signals S21, S22, S23 from the control device 305, respectively. Further, the load group 218 includes an output terminal for transmitting, for example, a load state signal S14 indicating a load factor according to the load state, and outputs it to the control device 305. The distributed power supply 307 includes forward converters (power generation controllers) 110, 215, and 218, and outputs a status signal (not shown) indicating whether power generation is in progress or standby and a power generation amount signal S24 to the control device 305.

  The control device 305 receives the load state signal S14 transmitted from the load group 218 and the state signal and the power generation amount signal S24 transmitted from the distributed power supply 307, and drives the inverter based on these signals (system interconnection inverter). ). For example, if the surplus power rate is 20% or less, only 8-2 is driven. This eliminates the need to drive 8-1 and 8-3, so that the drive efficiency is increased and the non-connected inverse conversion device can reduce conversion loss without becoming a load on the AC power supply system. it can. .

  If the surplus power ratio exceeds 20% and is 30% or less, 8-3 is driven, and if it exceeds 30% and is 50% or less, 8-1 is driven. Further, if the surplus power rate exceeds 50% and is 70% or less, 8-1 and 8-2 are driven, and if it exceeds 70% and is 80% or less, 8-1 and 8-3 are performed. If it exceeds 80% and is equal to or less than 100%, all the inverse conversion devices 8-1, 8-2, and 8-3 are driven. The inverse conversion device is driven by transmitting drive command signals S21, S22, and S23. As described above, the drive command signals are output alone or in combination as appropriate. I try to drive it.

  Note that the inverse conversion device (system interconnection inverter) may be installed in a distributed manner by changing the surplus rate as appropriate. If these are done in this way, the number of reverse conversion devices (system-connected inverters) distributed according to the surplus rate is connected to the AC power supply system to control the number of units. The interconnection inverter) does not become a load on the AC power supply system and also reduces conversion loss.

  In addition, if an inverter with the same surplus rate is installed in parallel as a spare for the inverse conversion device (system interconnection inverter) 8-1, the reliability becomes higher. Specifically, a drive command signal for driving them alternately may be output.

  As described above, in this embodiment, the inverse converters (inverters) that feed back the AC power supply system from the DC power supply system are dispersed and installed between them, and the number is controlled according to the surplus state (surplus rate). Reasonable operation can be performed, conversion loss can be reduced, and further energy saving can be achieved. In addition, it is possible to improve the system reliability by providing a spare as needed.

Embodiment 6 of the present invention will be described below with reference to the drawings.
FIG. 6 shows a system diagram of this embodiment. The devices denoted by the same reference numerals as those in FIGS. 1 to 5 are the same devices and have the same functions and performances, and thus description thereof is omitted. As shown in FIG. 6, in the present embodiment, a load for driving a motor 601 by an inverter 600 will be described as an example. Here, the inverter 600 is connected to the AC power sources R, S, T via the switch 602 to the AC power source system 1 shown in FIG. 1, and the DC power sources P, N are connected to the DC power source system 2 shown in FIG. It is connected via. In this way, each power supply system is connected via the switch, the switch 602 is closed, the switch 603 is opened, and the AC power supply system can be operated. The switch 602 is opened and the switch 603 is opened. If is closed, it can be operated by a DC power supply system and can be used for both AC and DC.

As described above, in this embodiment, in the case of a load that drives a motor by an inverter, an AC power supply system is connected to the AC power supply terminal of the inverter and a DC power supply is connected to the DC power supply terminal. This improves the reliability of the system, and the standardization and standardization of AC power system, DC power system, and distributed power system become common and spread.
The above embodiments of the present invention will be summarized below. In addition, the technical subject of each Example is as follows.
(1) A plurality of direct current power supply system voltages are determined according to the load group, and this is unified with the generation method from the alternating current power supply system or the distributed power supply, and the alternating current power supply system and the direct current power supply system.
(2) Unifying the surplus power generated by the distributed power supply to 100V, 200V, 400V AC power supply system (return to power supply) according to the circumstances of the power supply system, and its AC power supply system and DC Power system.
(3) How to reduce standby power of AC power supply system and DC power supply system.
(4) Same as above, control power supply of the control equipment (forward conversion device, reverse conversion device) should be taken from the DC power supply in common.
(5) A method of distributed installation and number control according to the load factor or surplus power of a control device (forward conversion device, reverse conversion device).
(6) For both AC and DC power supplies for inverter loads.

  In the embodiment of the present invention, a DC power supply system is generated by a plurality of AC power supply systems and a forward converter (converter) therefrom. Further, a DC power supply system is generated from a distributed power source (solar power generation, wind power generation, hydroelectric power generation, etc.) by a forward conversion device (converter) or a reverse forward conversion device (inverter). A DC power supply system is constructed from these DC power supply systems. The DC power supply system voltage is a plurality of voltages for each load group, and each of the plurality of DC power supply system voltages is generated by the plurality of AC power supply systems and forward converters (converters) corresponding thereto. The system is composed of a system and a DC power system generated by a distributed power source, and these DC power system voltages are unified.

  Moreover, a DC power supply system is generated by an AC power supply system and a forward converter (converter) in the future. Further, a DC power supply system is generated from a distributed power source (solar power generation, wind power generation, hydroelectric power generation, etc.) by a forward conversion device (converter) or an inverse conversion device (inverter). A DC power supply system is constructed from these DC power supply systems. A load group is connected to these DC power supply systems, and surplus power of the DC power supply system is fed back to the AC power supply by an inverse converter (inverter). In such an AC power supply system and DC power supply system, between the AC power supply system and the forward converter (converter), between the AC power supply system and the reverse converter (inverter), or between the DC power supply and solar power generation, wind power A switch is connected between each of power generation, hydropower generation, and the like, and a forward conversion device (converter) or reverse conversion device (inverter), and a state signal is transmitted from the load group. The forward converter (converter) or reverse converter (inverter) is provided with a signal for transmitting whether it is in operation or in standby, and a controller for controlling the operation of the AC power supply system and the DC power supply system is in standby. When the switch provided in the front stage of the corresponding forward conversion device (converter) or reverse conversion device (inverter) corresponding to this is opened, and the status signal from the load group takes in the surplus signal, the AC power supply Open the switch provided in the front stage of the forward converter (converter) that generates DC power from the system, and close the switch provided in the front stage of the reverse converter (inverter) that returns from the DC power system to the AC power system. To reduce.

  Also, a forward converter (converter) that generates DC power from an AC power supply, and a forward converter (converter) or reverse converter that generates DC power from a distributed power source (generated power such as solar power generation, wind power generation, and hydroelectric power generation). A control power source for controlling the device (inverter) and an inverse conversion device (inverter) that feeds back the surplus DC power source to AC is commonly connected as a power source from the DC power source.

  Moreover, a DC power supply system is generated by an AC power supply system and a forward converter (converter) in the future. Further, a DC power supply system is generated by a distributed power supply system (natural power, such as solar power generation, wind power generation, and hydroelectric power generation) and a forward conversion device (converter) or an inverse conversion device (inverter). A DC power meter is constructed with these DC power supply systems. A load group is connected to these DC power supply systems. Further, surplus power of the DC power supply system is fed back to the AC power supply by an inverse converter (inverter). In the AC power supply system and the DC power supply system thus configured, a plurality of inverse conversion devices (inverters) for returning from the DC power supply system to the AC power supply system are installed in a distributed manner according to surplus power. The inverter) has a drive command receiving unit, and transmits a surplus power state signal to each of the distributed power sources. A control device that controls the operation of the AC power supply system and the DC power supply system takes in the surplus power state signal and outputs a drive command signal to the inverse conversion device (inverter) according to the surplus state.

  Moreover, a DC power supply system is generated by an AC power supply system and a forward converter (converter) in the future. Further, a DC power supply system is generated by a distributed power supply system (natural power, such as solar power generation, wind power generation, and hydroelectric power generation) and a forward conversion device (converter) or an inverse conversion device (inverter). A DC power supply system is constructed with these. A load group is connected to these DC power supply systems. The surplus power of the DC power supply system is fed back to the AC power supply by an inverse converter (inverter). In the AC power supply system and the DC power supply system thus configured, a plurality of inverse conversion devices (inverters) for returning from the DC power supply system to the AC power supply system are installed in a distributed manner according to surplus power. Inverter) has a drive command receiving unit, and transmits a surplus power state signal to each of the distributed power sources, and a control device for operating and controlling the AC power supply system and the DC power supply system takes in the surplus power state signal and surplus A drive command signal is output to the inverse converter (inverter) according to the state.

  In addition, a DC power supply system is generated by a plurality of AC power supply systems and forward converters (converters) from these, and a DC power supply system is generated by a distributed power supply system (natural energy such as solar power generation, wind power generation, and hydropower generation), With these, a DC power supply system is constructed. When the load is an inverter, the AC power supply terminal of the inverter is connected to the AC power supply via the switch, and the DC power supply terminal of the inverter is connected to the DC power supply via the switch to switch these switches. This enables operation with either an AC power supply or a DC power supply.

  DESCRIPTION OF SYMBOLS 1 ... Three-phase 400V alternating current power supply system, 2 ... DC power supply system (240V-350V), 6 ... Forward converter (converter), 1a * 1c * 2a * 2b * 2d * 2e * 2f * 111a * 216a * 219a ... Branch Power supply, 300, 301, 302, 303, 304, switch, 305, control device, S1, S2, S3, distributed power supply status signal, S4, signal indicating the operating status of the load group.

Claims (10)

Multiple AC power systems,
A first forward conversion device that is connected to a predetermined AC power supply system among the plurality of AC power supply systems and converts AC power of the predetermined AC power supply system into DC power within a first setting range;
The first DC power supplied from the first forward converter and the DC power from the first solar power generator, the first wind power generator, or the first hydroelectric generator DC power supply system,
A second forward converter that is connected to a predetermined AC power system among the plurality of AC power systems and converts AC power of the predetermined AC power system into DC power within a second setting range;
A second power source configured to be supplied with direct current power from the second forward conversion device and direct current power from the second solar power generation device, the second wind power generation device, or the second hydraulic power generation device; DC power supply system,
An electric power feeding system comprising: The power supply system according to claim 1,
A first opening / closing means provided between the first solar power generation device, the first wind power generation device, or the first hydraulic power generation device, and the first DC power supply system, and disconnects each connection. When,
Second opening / closing means provided between the second solar power generation device, the second wind power generation device, or the second hydraulic power generation device, and the second DC power supply system, and disconnects each connection. When,
When the first solar power generation device, the first wind power generation device, or the first hydroelectric power generation device is on standby, the first opening / closing means is opened to disconnect the standby power generation device,
When the second solar power generation device, the second wind power generation device, or the second hydroelectric power generation device is on standby, the second opening / closing means is opened to cut off the connection with the standby power generation device. Power supply system characterized by AC power supply system,
A forward conversion device that is connected to the AC power supply system and converts AC power of the AC power supply system into DC power within a set range;
A DC power supply system configured to be supplied with DC power from the inverse conversion device and DC power from a solar power generation device, a wind power generation device, or a hydropower generation device;
The solar power generation device, the wind power generation device, or the hydroelectric power generation device, each provided between the DC power supply system, comprising an opening and closing means for cutting off each connection,
When the solar power generation device, the wind power generation device, or the hydroelectric power generation device is on standby, the power supply system is configured to open the opening / closing means and cut off the connection with the standby power generation device. In the electric power feeding system according to claim 3,
An inverter that is connected between the AC power supply system and the DC power supply system and converts DC power of the DC power supply system into AC power;
When the power consumption of a load group that is connected to the DC power supply system and consumes DC power is equal to or less than a predetermined value, the DC power of the DC power supply system is converted into AC power via the inverse converter, and A power feeding system characterized by returning to an AC power supply system. In the electric power feeding system according to claim 3,
Used for control of the forward conversion device, the solar power generation device, the wind power generation device, or the forward conversion device that forms DC power from the generated power of the hydroelectric power generation device, or the reverse conversion device, and the reverse conversion device. A power supply system using a power supply connected in common with DC power from the DC current system. In the electric power feeding system according to claim 4,
A second opening / closing means for cutting off the connection between the inverse converter and the AC power supply system is provided, and when the power is fed back to the AC power supply system, the second opening / closing means is closed and connected. Power supply system. The power supply system according to claim 6, further comprising a third opening / closing means for cutting off the connection between the forward conversion device and the AC power supply system,
When power is fed back to the AC power supply system, the second opening / closing means is closed and connected, and the third opening / closing means is opened to cut off the connection. AC power supply system,
A plurality of forward converters connected to the AC power supply system to convert AC power of the AC power supply system into DC power within a set range;
A DC power supply system configured to be supplied with DC power from the plurality of inverse conversion devices and DC power from a solar power generation device, a wind power generation device, or a hydropower generation device,
The power feeding system, wherein the number of the forward conversion devices to be driven increases as the power consumption of a load group that is connected to the DC power supply system and consumes DC power increases. AC power supply system,
A forward conversion device that is connected to the AC power supply system and converts AC power of the AC power supply system into DC power within a set range;
A DC power supply system configured to be supplied with DC power from the inverse conversion device and DC power from a solar power generation device, a wind power generation device, or a hydropower generation device;
A plurality of inverse conversion devices that are connected between the AC power supply system and the DC power supply system and convert DC power of the DC power supply system into AC power, and
The inverse conversion device that is driven as the DC power generated by the solar power generation device, wind power generation device, or hydropower generation device is larger than the power consumption of a load group that is connected to the DC power supply system and consumes DC power Power supply system characterized by increasing the number of units. In the electric power feeding system in any one of Claims 1-9,
When the load connected to the DC power supply system is an inverter, the AC power supply terminal of the inverter is connected to the AC power supply system via a switch, and the DC power supply terminal of the inverter is connected to the DC power supply system via a switch. The power supply system is characterized in that it can be operated with either AC power or DC power by switching the switch.

Images