WO2014136248A1

WO2014136248A1 - Power supply apparatus

Info

Publication number: WO2014136248A1
Application number: PCT/JP2013/056382
Authority: WO
Inventors: 啓角谷; 伸治今井; 寛岩澤
Original assignee: 株式会社日立製作所
Priority date: 2013-03-08
Filing date: 2013-03-08
Publication date: 2014-09-12

Abstract

The present invention addresses the problem of providing a power supply apparatus capable of stably supplying power and also achieving a longer life. This problem can be solved by being provided with two power conversion devices in each of which alternating-current-side connection terminals of a plurality of power conversion units capable of power conversion between direct current power and alternating current power are electrically connected in series, and a plurality of power storage devices, making the number of the plurality of power conversion units constituting each of the two power conversion devices and the number of the plurality of power storage devices the same, providing each of the plurality of power storage devices such that the power storage device is common to any one of the plurality of power conversion units constituting one of the two power conversion devices and any one of the plurality of power conversion units constituting the other, and electrically connecting the power storage device to direct-current-side connection terminals of the corresponding two power conversion units.

Description

Power supply

The present invention relates to a power supply device.

As background art in the technical field, for example, there are techniques disclosed in

Patent Documents

1 and 2.

Patent Document 1 includes a plurality of bridge circuits, and a DC power source (such as a lead battery) that outputs DC power is connected to each DC side connection terminal of each of the plurality of bridge circuits. There is disclosed a power conversion device capable of converting DC power of a DC power supply and AC power of AC-side connection terminals connected in series of a plurality of bridge circuits by connecting terminals in series.

In Patent Document 2, a DC side of a converter that converts AC power to DC power and a DC side of an inverter that converts DC power to AC power are electrically connected in series, and an AC power system and an AC load are connected. An uninterruptible power supply apparatus in which a DC power source is electrically connected between a converter and an inverter is disclosed.

JP 2006-320103 A Japanese Patent Laying-Open No. 2005-45856

In recent years, there are concerns about global warming due to carbon dioxide emissions and the depletion of fossil fuels, and there is a demand for a reduction in carbon dioxide emissions and a decrease in dependence on fossil fuels. In order to reduce carbon dioxide emissions and reduce dependence on fossil fuels, it is considered effective to introduce a power generation system that uses renewable energy such as wind power and sunlight. ing.

In order to introduce a power generation system that uses renewable energy, it is necessary to have a means to suppress power fluctuations associated with fluctuations in renewable energy, which are influenced by weather conditions, and as one means, electrical energy can be stored and released. Is attracting attention. When the power generated using renewable energy is surplus, the power storage system stores the surplus power. When the electric power generated using renewable energy is insufficient, the power storage system discharges the stored electric power as much as the electric power is insufficient. Thus, it is possible to effectively use renewable energy by providing a storage system in the renewable energy power generation system.

Since the power storage system provided in the renewable energy power generation system is repeatedly charged and discharged in a relatively short cycle, life management of a plurality of power storage devices constituting the power storage system is important. As management of the plurality of power storage devices, it is conceivable to manage the plurality of power storage devices collectively using an inverter or a power conditioner. However, when managing a plurality of power storage devices collectively, due to variations in the state and characteristics of the plurality of power storage devices, some of the low performance power storage devices affect other good performance power storage devices, It is conceivable that the life of the entire power storage system is shortened.

In order to extend the life of the power storage system, it is conceivable to employ the power conversion device disclosed in Patent Document 1 to configure the power storage system. According to the power storage system employing the power conversion device disclosed in Patent Document 1, a plurality of power storage devices constituting the power storage system are divided into a plurality of power storage device groups, and the power storage devices are managed for each power storage device group. Because the state of charge of power storage devices can be controlled for each device group, due to variations in the status and characteristics of multiple power storage devices, some low performance power storage devices can be changed to other good performance power storage devices. The influence exerted can be reduced, and the life of the power storage system can be extended.

However, since the power storage system employing the power conversion device disclosed in Patent Document 1 is electrically connected in parallel to the AC power system, the power generation system, and the AC load, power is stably supplied to the AC load. For this purpose, it is necessary to cooperate closely with the AC system and the power generation system. For example, when the AC power system tends to be unstable, it is necessary to increase the capacity of the power storage system of the power storage system in order to stabilize the unstable power of the AC power system. Also, when the power supply of the AC power system or power generation system is interrupted, a system that monitors the AC power system or power generation system is necessary to detect the power interruption and safely supply power to the AC load. It is. Furthermore, when power cut-off is not permitted, that is, when a medical or backbone communication network is used as an AC load, it is necessary to construct a system so that power cut-off can be suppressed, and the construction requires additional costs.

As an effective means for stably supplying power to an AC load, it is conceivable to construct a power storage system like the uninterruptible power supply disclosed in Patent Document 2. According to the construction of the power storage system like the uninterruptible power supply disclosed in Patent Document 2, since the AC power system and the DC power source can be provided as power supply sources, the AC power system is unstable. Even if the power of the AC power system is cut off, power can be stably supplied to the AC load.

However, since the uninterruptible power supply disclosed in Patent Document 2 controls the state of the DC power supply collectively using a converter or an inverter, there are variations in the states and characteristics of the plurality of power storage devices constituting the DC power supply. In some cases, the life of the entire DC power supply is affected, and the life of the uninterruptible power supply can be shortened.

A typical problem to be solved is to balance the stabilization of power supply from the power supply device and the extension of the life of the power supply device.

In solving the above typical problems, it is preferable to keep the introduction cost of the power supply device low by simply configuring the system and minimizing the number of power storage devices to be introduced.

The representative problem is that two sets of power conversion devices in which AC side connection terminals of a plurality of power conversion units capable of power conversion between DC power and AC power are electrically connected in series, and a plurality of power storage devices, The plurality of power conversion units and the plurality of power storage devices constituting each of the two sets of power conversion devices are the same number, and each of the plurality of power storage devices constitutes one of the two sets of power conversion devices. Provided in common for any one of the power conversion units and any one of the plurality of power conversion units constituting the other, and electrically connected to the DC side connection terminals of the corresponding two sets of power conversion units This can be solved by a typical solution.

According to a typical solution, power can be stably supplied from the power supply device, and the life of the power supply device can be extended.

The block diagram which shows schematic structure of a power supply device. The circuit diagram which shows the structure of the 1st small size converter which comprises the 1st power converter device of FIG. A command value (target voltage) for one cycle for each of the four first small converters constituting the first power converter of FIG. 1 and the AC side connection terminals of the four first small converters are input. The time chart which shows the time change of the relationship with the voltage for 1 cycle. The functional block diagram which shows the structure of the switching drive pattern correction | amendment part mounted in the central control apparatus which comprises the power supply device of FIG. It is a graph which shows the charging condition in a certain measurement timing of each of the four electrical storage apparatuses which comprise the power supply device of FIG. 1, and shows an example when the charging condition is prepared. FIG. 6 is a graph showing the amount of power input to the corresponding power storage device from each of the four first small conversion devices constituting the first power conversion device of FIG. 1 according to the state of charge of the four power storage devices of FIG. 5. There is an example when the input power amounts are equal. FIG. 6 is a graph showing the amount of power output from the corresponding power storage device to each of the four second small conversion devices constituting the second power conversion device of FIG. 1 according to the state of charge of the four power storage devices of FIG. 5. An example is shown when the output power amounts are equal. It is a graph which shows the charge condition in the certain measurement timing of each of the four electrical storage apparatuses which comprise the power supply device of FIG. 1, and shows an example when the charge condition varies. FIG. 9 is a graph showing the amount of power input to the corresponding power storage device from each of the four first small conversion devices constituting the first power conversion device of FIG. 1 according to the state of charge of the four power storage devices of FIG. 8. There is an example when the input power amounts are different. FIG. 9 is a graph showing the amount of power output from the corresponding power storage device to each of the four second small conversion devices constituting the second power conversion device of FIG. 1 according to the state of charge of the four power storage devices of FIG. 8. There is an example when the output power amounts are different. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device. The block diagram which shows schematic structure of another power supply device.

An embodiment of the present invention will be described.
(Outline of the application application of the invention)
In the following, the present invention is applied to a power supply system that uses a power generation system that uses renewable energy such as wind power or sunlight as a main power source and an AC power system as a load, and supplies AC power supplied from the main power source to the load. A case where the present invention is applied to a stationary power supply apparatus electrically connected as a power supply will be described as an example.

The stationary power supply device is installed in the power generation farm where the power generation system is located, and is installed in the power generation system.

∙ Power generation systems using renewable energy have the advantage of less impact on the natural environment, but the power generation capacity depends on the natural environment such as the weather, and the output to the AC power system fluctuates. In order to suppress (relax) this output fluctuation, a stationary power supply device is provided. When the power output from the power generation system to the AC power system is insufficient with respect to the predetermined output power, the stationary power supply device discharges the power and compensates for the power shortage. When the power output from the power generation system to the AC power system is in a surplus state with respect to the predetermined power, the stationary power supply device receives and charges the surplus power generated.

The stationary power supply device to which the present invention is applied is an uninterruptible power supply installed as a backup power source for avoiding power interruption in facilities that handle medical equipment such as hospitals, facilities that have server systems and communication facilities such as data centers, etc. It can also be applied to power supply devices. In the case of this embodiment, the AC power system (commercial power supply) is the main power supply side, the medical device, the server system, and the communication facility are the load side, and the stationary power supply device is electrically connected between them.

A stationary power supply apparatus to which the present invention is applied is installed in a consumer, stores power at night, discharges the stored power in the daytime, and balances the power load while maintaining the equipment of the consumer. The present invention can also be applied to a power storage device that supplies power. In the case of this embodiment, the AC power system (commercial power supply) is the main power supply side, the consumer device is the load side, and a stationary power supply device is electrically connected between them.

Furthermore, the stationary power supply device to which the present invention is applied is electrically connected in the middle of the transmission / distribution system, and is used as a countermeasure for fluctuation of power transmitted / distributed in the transmission / distribution system, a countermeasure for surplus power, a countermeasure for frequency, a countermeasure for reverse power flow, etc. It is applicable also to the power supply device used. In the case of this embodiment, the power transmission system side is the main power supply side, the power distribution system side is the load side, and the stationary power supply apparatus is electrically connected between them.

In addition to the above, a DC power system can be considered as the main power source and load.
(Overview of power supply)
As the stationary power supply device, a plurality of power storage units each having a plurality of power storage units and a power conversion unit that controls power input / output to / from the power storage units are electrically connected in series. A multiple inverter type power supply device configured to synthesize and output the output voltage is employed.

The plurality of capacitors are secondary batteries that store (charge) and discharge (discharge) electrical energy by an electrochemical action or charge storage structure, or passive elements having capacitance, and output voltages required for stationary power supply devices Depending on the specifications such as the storage capacity, they are electrically connected in series, in parallel, or in series-parallel.

A lithium ion secondary battery is used as a storage battery, but another secondary battery such as a lead battery or a nickel metal hydride battery, or a hybrid that combines two types of storage batteries, for example, a lithium ion secondary battery and a nickel metal hydride battery. A secondary battery may be used. As the capacitive passive element, a capacitor such as an electric double layer capacitor or a lithium ion capacitor can be used.

Hereinafter, examples of the present embodiment will be described with reference to the drawings.

1st Example is described using FIG. 1 thru | or 10. FIG.

FIG. 1 shows a schematic configuration of the entire power supply device 1.
(Configuration of power supply device 1)
As shown in FIG. 1, the power supply device 1 is provided in the middle of the power supply system from the power generation system 19 to the single-phase AC power system 20, and the single-phase AC power output from the power generation system 19 passes through the power supply device 1. Thus, it is supplied to the single-phase AC power system 20. When the output of the power generation system 19 is insufficient with respect to the request of the single-phase AC power system 20, power is supplemented from the power supply device 1, and the output of the power generation system 19 with respect to the request of the single-phase AC power system 20 Is excessive, power is absorbed by the power supply device 1.

A power supply side (AC primary side) connection terminal 17 is provided on one end side of the power supply device 1. The power supply side connection terminal 17 is electrically connected to the AC side of the power generation system 19. A load side (AC secondary side) connection terminal 18 is provided on the other end side of the power supply device 1. A single-phase AC power system 20 is electrically connected to the load side connection terminal 18.

The power supply device 1 includes a central control device 2, a first power conversion device 7, a second power conversion device 12, and power storage devices 13 to 16 as main components.

The first power conversion device 7 includes first small conversion devices (power conversion units) 3 to 6. Each of the first small converters 3 to 6 includes an AC side connection terminal and a DC side connection terminal. The AC side connection terminals (reference numeral 33 in FIG. 2 to be described later) of the first small conversion devices 3 to 6 are electrically connected in series in the order of the potential of the AC voltage at the AC side connection terminal (from the top in FIG. 1). Are connected in series in electrical order below). Each of the direct current side connection terminals (reference numeral 34 in FIG. 2 described later) of the first small conversion devices 3 to 6 is electrically connected to any one of the power storage devices 13 to 16.

The second power conversion device 12 includes second small conversion devices (power conversion units) 8 to 11. Each of the second small conversion devices 8 to 11 includes an AC side connection terminal and a DC side connection terminal. The AC side connection terminals (reference numeral 33 in FIG. 2 described later) of the second small converters 8 to 11 are electrically connected in series in the order of the potential of the AC voltage at the AC side connection terminal (from the top in FIG. 1). Are connected in series in electrical order below). Each of the DC side connection terminals (reference numeral 34 in FIG. 2 described later) of the second small conversion devices 8 to 11 is electrically connected to any one of the power storage devices 13 to 16.

The first small conversion devices 3 to 6, the second small conversion devices 8 to 11 and the power storage devices 13 to 16 have the same number. For this reason, each of the power storage devices 13 to 16 is provided in common with any one of the first small conversion devices 3 to 6 and any one of the second small conversion devices 8 to 11. And electrically connected to the DC connection terminals of the corresponding first and second small conversion devices.

According to the above configuration, as shown in FIG. 1, any one DC side connection terminal of the first small conversion devices 3 to 6 and any one DC side connection terminal of the second small conversion devices 8 to 11 are provided. Thus, the corresponding first and second small conversion devices are electrically connected in series.

In addition, according to the above configuration, as shown in FIG. 1, one side of the DC side connection terminal between any one of the first small conversion devices 3 to 6 and any one of the second small conversion devices 8 to 11 ( Any one of the power storage devices 13 to 16 is electrically connected between the electrical connection circuit (wiring) between the positive electrodes) and the electrical connection circuit (wiring) between the other electrodes (negative electrode). As a result, each of the power storage devices 13 to 16 is electrically connected to the corresponding first and second small conversion devices in parallel.

In this embodiment, the first small conversion device and the second small conversion device having the same potential are electrically connected in series corresponding to the order of the potential of the AC voltage at the AC side connection terminal. In FIG. 1, the first small conversion device and the second small conversion device of the same order are electrically connected in series corresponding to the order arranged from the top to the bottom.

Each of the electricity storage devices 13 to 16 includes a plurality of electricity storage devices (lithium ion secondary batteries) that are electrically connected in series and parallel, although not clearly shown in FIG. The electrical connection of the plurality of capacitors is connected in series according to the specifications relating to the output voltage and the storage capacity required for the storage system constituted by the first and second power conversion devices 7 and 12 and the storage devices 13 to 16, Either parallel connection or series-parallel connection is used. In this embodiment, it is provided corresponding to the power generation system 19 using renewable energy, and high voltage and high capacity are required as specifications. Therefore, a plurality of capacitors are electrically connected in series and parallel.

The first and second power converters 7 and 12 are operated by the first small converters 3 to 6 and the second small converters 8 to 11 based on the command value output from the central controller 2. The AC power output from the power generation system 19 is supplied to the single-phase AC power system 20. The first power conversion device 7 converts the AC power received from the power generation system 19 at the power supply side connection terminal 17 into a plurality of DC power and inputs the converted power to each of the power storage devices 13 to 16. The second power conversion device 12 converts the DC power transmitted from each of the power storage devices 13 to 16 into a plurality of AC powers, combines the converted AC powers into one AC power, and connects to the load side It is output to the single-phase AC power system 20 via the terminal 18.

In this embodiment, the first power converter 7 functions exclusively as an AC → DC power converter (converter) and the second power converter 12 functions exclusively as a DC → AC power converter (inverter). The power conversion in the direction opposite to the above direction is also possible by the circuit configuration described later using.

The central control device 2 is preinstalled with a control program (stored in a storage device). The central controller 2 operates according to the control program, and calculates and outputs command values transmitted to the first small converters 3 to 6 and the second small converters 8 to 11, respectively. The control program of the central control device 2 is set so that the operating states of the power generation system 19, the single-phase AC power system 20, and the power storage devices 13 to 16 are optimized. Therefore, although not clearly shown in FIG. 1, the central control device 2 uses sensors for measuring the operating state of the power generation system 19 connected to the power supply side connection terminal 17, for example, a voltage sensor and a current sensor, and an electric storage device. Command values transmitted to each of the first small converters 3 to 6 based on measurement signals output from sensors for measuring the operating states of the devices 13 to 16, for example, voltage sensors, current sensors, and temperature sensors. And the sensors for measuring the operating state of the single-phase AC power system 20 connected to the load side connection terminal 18, such as voltage sensors and current sensors, and the operating states of the power storage devices 13 to 16 are measured. A signal is transmitted to each of the second small-sized conversion devices 8 to 11 based on measurement signals output from a sensor for performing, for example, a voltage sensor, a current sensor and a temperature sensor And calculates the command value.
(Configuration of small converter)
FIG. 2 shows a circuit configuration of the first small conversion device 3.

The first small conversion devices 4 to 6 and the second small conversion devices 8 to 11 have the same circuit configuration as the first small conversion device 3. Therefore, the description of the configuration of the first small conversion devices 4 to 6 and the second small conversion devices 8 to 11 is omitted. When the same configuration as the first small conversion device 3 is described in the first small conversion devices 4 to 6 and the second small conversion devices 8 to 11, the same reference numerals as those of the first small conversion device 3 are used. To do.

The first small conversion device 3 includes, as main components, a switching circuit 30, an AC-side connection terminal 33 electrically connected to the switching circuit 30, an electrical connection to the switching circuit 30, and a connection to the power storage device 13. And a control device 35 that controls the operation of the switching circuit 30.

The switching circuit 30 includes switching elements 31a to 31d. As the switching elements 31a to 31d, field effect transistors (FETs) are employed, and among these, MOS (Metal Oxide Semiconductor) FETs are employed.

In this embodiment, the case where MOFETs are used as the switching elements 31a to 31d will be described as an example. However, other switching elements such as IGBT (Insulated Gate Bipolar Transistor) may be used.

The switching circuit 30 is specifically composed of a single-phase full-bridge inverter circuit. The single-phase full-bridge inverter circuit includes a first arm configured by electrically connecting a source of an upper arm switching element 31a and a drain of a lower arm switching element 31b in series, and an upper arm switching element 31c. And the second arm configured by electrically connecting the source of the lower arm and the drain of the lower arm switching element 31d in series are the drains of the upper

arm switching elements

31a and 31c and the lower arm switching element 31b, A circuit configuration in which the sources of 31d are electrically connected in parallel by being electrically connected to each other is provided.

A diode 32a is provided between the drain and source of the switching element 31a. A diode 32b is provided between the drain and source of the switching element 31b so that the direction from the source to the drain is the forward direction. A diode 32c is provided between the drain and source of the switching element 31c so that the direction from the source to the drain is the forward direction. A diode 32d is provided between the drain and source of the switching element 31d so that the direction from the source to the drain is the forward direction. The diodes 32a to 32d are diodes that are parasitic between the drains and sources of the switching elements 31a to 31d due to the structure of the MOSFET. Therefore, it is not necessary to separately provide a diode for each of the switching elements 31a to 31d.

When an IGBT is used as the switching element, it is necessary to provide a diode between the drain and source of the switching element.

The drains of the

switching elements

31a and 31c of the upper arm are electrically connected to the positive terminal of the DC connection terminal 34 as the DC positive terminal. The sources of the switching

elements

31b and 31d of the lower arm are electrically connected to the negative electrode side terminal of the DC side connection terminal 34 as a DC negative electrode side connection end.

The middle point of the first arm, that is, the electrical connection point between the source of the switching element 31a of the upper arm and the drain of the switching element 31b of the lower arm is drawn out as one side of the AC side connection end (load side connection end). In addition, the AC side connection terminal 33 is electrically connected to a terminal on one side. The middle point of the second arm, that is, the electrical connection point between the source of the switching element 31c of the upper arm and the drain of the switching element 31d of the lower arm is drawn out as the other side of the AC side connection end (load side connection end). The other side of the AC side connection terminal 33 is electrically connected.

One terminal of the AC side connection terminal 33 of the first small conversion device 3 is electrically connected to one terminal of the AC side connection terminal 17 of the first power conversion device 7. The other terminal of the AC side connection terminal 33 of the first small conversion device 3 is connected in series to the first small conversion device 3 (adjacent in terms of the potential level of the AC voltage). It is electrically connected to a terminal on one side of the side connection terminal.

Note that, based on the configuration of FIG. 1, the electrical connection on the AC side of the first small conversion devices 4 to 6 and the second small conversion devices 8 to 11 has the following relationship.

<AC connection terminal 33 of first small conversion device 4>
One terminal—the other terminal of the AC connection terminal 33 of the first small conversion device 3 The other terminal—the one terminal of the AC connection terminal 33 of the first small conversion device 5 <the first small conversion device 5 AC connection terminal 33>
One terminal—the other terminal of the AC connection terminal 33 of the first small conversion device 4 The other terminal—the one terminal of the AC connection terminal 33 of the first small conversion device 6 <of the first small conversion device 6 AC connection terminal 33>
One terminal—the other terminal of the AC connection terminal 33 of the first small converter 5 The other terminal—the other terminal of the AC connection terminal 17 of the first power converter 7 <Second small converter 8 AC side connection terminal 33>
One terminal—one terminal of the AC side connection terminal 18 of the second power converter 12 The other terminal—one terminal of the AC side connection terminal 33 of the second small converter 9 <Second small converter 9 AC connection terminals 33>
One terminal—the other terminal of the AC connection terminal 33 of the second small conversion device 8 The other terminal—the one terminal of the AC connection terminal 33 of the second small conversion device 10 <of the second small conversion device 10 AC connection terminal 33>
One terminal—the other terminal of the AC connection terminal 33 of the second small conversion device 9 The other terminal—the one terminal of the AC connection terminal 33 of the second small conversion device 11 <the second small conversion device 11 AC connection terminal 33>
One side terminal—the other side terminal of the AC connection terminal 33 of the second small converter 10 The other side terminal—the other side terminal of the AC side connection terminal 18 of the second power converter 12

A control program is preinstalled in the control device 35 (stored in a storage device). The control device 35 operates in accordance with the control program, and the switching elements 31a to 31d are connected to the power generation system 19 connected to the power supply side AC terminal 17 to which the first power conversion device 7 is electrically connected. The switching operation (ON / OFF) is controlled. Specifically, the control device 35 generates a drive pattern for switching each of the switching elements 31a to 31d (on / off) based on the command value transmitted from the central control device 2, and A drive signal corresponding to each of the generated drive patterns is output to each gate of the switching elements 31a to 31d. Thereby, the switching operation (ON / OFF) is controlled so that each of the switching elements 31a to 31d is turned ON / OFF corresponding to the generated drive pattern.

In the other first small conversion devices 4 to 6, the switching operations (on / off) of the switching elements 31a to 31d are controlled in the same manner as the first small conversion device 3 so as to be linked to the power generation system 19. Yes.

The second small converters 8 to 11 are connected to the single-phase AC power system 20 connected to the load-side AC terminal 18 to which the second power converter 8 is electrically connected. 3, the switching operation (on / off) of the switching elements 31 a to 31 d is controlled.
(Operation of the first power converter 7)
Next, the operation of the first small conversion devices 3 to 6 constituting the first power conversion device 7 will be described with reference to FIG.

FIG. 3 shows one of the command values (target voltage) transmitted from the central control device 2 to the first power converter 7 and the AC side connection terminal 33 of each of the first small converters 3 to 6. The time change of the relationship with the rectangular wave voltage is shown.

3 The horizontal axis in FIG. 3 is the time axis and represents one cycle.

The vertical axis in FIG. 3 is the voltage axis, and in order from the top,
Target voltage which is one of the command values transmitted from the central controller 2 The rectangular wave voltage V ₃ input to the AC side connection terminal 33 of the first small converter ₃
Rectangular wave voltage V ₄ input to the AC side connection terminal 33 of the first small-sized conversion device ₄
Rectangular wave voltage V ₅ input to the AC side connection terminal 33 of the first small converter ₅
The rectangular wave voltage V ₆ input to the AC side connection terminal 33 of the first small converter ₆
Respectively. The upper side is a positive value and the lower side is a negative value with respect to the point where each voltage on the vertical axis in FIG. 3 becomes zero.

The central control device 2 controls the first power converter 7 (each of the first small converters 3 to 6) based on the AC voltage and AC current of the power generation system 19 electrically connected to the power supply side connection terminal 17. A target voltage (modulated wave that is a sine wave) is calculated as one of the command values, and the calculated target voltage is output to the first power converter 7 (each of the first small converters 3 to 6). . Although not clearly shown in FIG. 3, the central controller 2 uses a carrier (a carrier wave such as a triangular wave or a sawtooth wave as another command value for each of the first small converters 3 to 6 and adjusts it. The period is shorter than the wave (the frequency is large) and the potential level is different corresponding to each of the first small-sized conversion devices 3 to 6), and the generated carrier is used as the corresponding first small-sized conversion device. Is output.

The target voltage (see FIG. 3A) output from the central controller 2 and the corresponding carrier (not shown) are transmitted as signals to each of the first small conversion devices 3 to 6. Each of the first small-sized conversion devices 3 to 6 compares the target voltage and the carrier shown in FIG. 3A, and the portion where the switching element is turned on and becomes smaller at the portion where the absolute value of the target voltage is larger than the carrier. Drive patterns for generating switching operations (ON / OFF) for each of the switching elements 31a to 31d are generated so that the switching elements are turned off, and a drive signal corresponding to the generated drive pattern is applied to the corresponding switching element. Output to the gate. As a result, each of the switching elements 31a to 31d performs a switching operation (ON / OFF) corresponding to the drive pattern, and therefore the AC side connection terminals 33 of the first small-sized conversion devices 3 to 6 are connected to FIG. ) To (e), rectangular-wave voltages having different amplitude reference potentials and widths and the same amplitude height are input.

Specifically, as shown in FIGS. 3B to 3E, in the period from time 0 to time T ₉ , the first small size is generated in the period from time T ₁ to time T ₈ according to the phase of the target voltage. voltage of the AC-side connection terminal 33 of the converter 6 is positive, the voltage of the AC-side connection terminals 33 of the first small converter 5 from the time T _2, the period from time T ₇ is positive, the period of time T ₆ from the time T ₃ voltage of the first AC-side connection terminals 33 of the small converter 4 is positive, the rectangular wave voltage of the first small converter 3 on the AC side connection terminal 33 is a positive period of time T ₅ from time T ₄ multi in The level voltage is input to the AC side connection terminals 33 of the first small conversion devices 3 to 6. Further, in the period from time T ₁₀ from time T _9, a negative voltage opposite is input from the time 0 to the period of time T _9. As a result, a multilevel voltage corresponding to one cycle of the target voltage is input to the AC side connection terminals 33 of the first small-sized conversion devices 3 to 6. The time is a value determined based on the phase of the target voltage, and changes based on a change in the phase of the target voltage.

Although not described in detail with reference to the drawing, the second power conversion device 12 operates in the same manner as the first power conversion device 7, so that a multilevel voltage as shown in FIG. Output from the load side AC terminal 33.

That is, each of the second small converters 8 to 11 is one of command values calculated based on the AC voltage and AC current of the single-phase power system 20 electrically connected to the AC side connection terminal 33. A carrier that is one of the target voltage and the command value is transmitted from the central controller 2. Each of the second small converters 8 to 11 compares the target voltage with the carrier, and the switching element is turned on when the absolute value of the target voltage is larger than the carrier, and the switching element is turned off when the absolute value of the target voltage is smaller. In addition, a drive pattern for switching the switching elements 31a to 31d (on / off) is generated, and a drive signal corresponding to the generated drive pattern is output to the gates of the switching elements 31a to 31d. As a result, the switching elements 31a to 31d perform switching operation (ON / OFF) in accordance with the drive pattern, and therefore the reference potential and width of the amplitude are supplied from the AC side connection terminals 33 of the second small converters 8 to 11, respectively. Are different, and a rectangular wave voltage having the same amplitude is output.
(Operation according to the state of power storage devices 13 to 16)
Next, operations according to the states of the power storage devices 13 to 16 will be described with reference to FIGS.

As described above, in this embodiment, the multilevel voltage corresponding to the target voltage is shared and input by each of the first small converters 3 to 6, and is shared by each of the second small converters 8 to 11. Output. For this reason, if the voltage sharing is always the same, the usage time and frequency of power storage devices 13-16 vary, and the life of power storage devices 13-16 varies. When the life variation occurs, the life of the power supply device 1 as a whole is reduced. If the voltage sharing is always the same, the charging states of the power storage devices 13 to 16 vary, and depending on the operating state of the power supply device 1, the power storage device having the highest and lowest charging states can be charged / discharged. It may be considered that charging / discharging exceeds the value. Charging / discharging exceeding the allowable value affects the deterioration of the power storage device and causes the life of the power storage devices 13 to 16 to vary. Further, the variation in the state of charge of power storage devices 13 to 16 is also caused by the difference in characteristics of power storage devices 13 to 16. For this reason, when charging / discharging the power storage devices 13 to 16, the amount of power input / output to / from each of the power storage devices 13 to 16 according to variations in characteristics, variations in charge state, variations in deterioration state, and the like. Is preferably controlled.

Therefore, in this embodiment, the amount of power input / output to / from each of the power storage devices 13 to 16 by charging / discharging can be controlled according to the state and characteristics of the power storage devices 13 to 16. Specifically, the respective switching drive patterns of the first small conversion devices 3 to 6 constituting the first power conversion device 7 and the second small conversion devices 8 to 11 constituting the second power conversion device 12 are corrected. A drive pattern correction unit for this purpose is mounted on the central controller 2 by being incorporated into a control program (algorithm).

As shown in FIG. 4, the drive pattern correction unit includes power storage device input / output power amount determination unit 401, first power conversion device drive pattern correction unit 402, and second power conversion device drive pattern correction unit 403 as main components. The first small conversion devices 3 to 6 and the second small conversion devices 8 to 11 constituting the second power conversion device 12 are corrected so that the switching drive patterns calculated in the respective control devices 35 of the first small conversion devices 8 to 11 are corrected. The switching drive pattern correction command value is output to the control devices 35 of the second small converters 8 to 11 constituting the small converters 3 to 6 and the second power converter 12.

The power storage device input / output power amount determination unit 401 determines the amount of power to be input / output to each of the power storage devices 13 to 16 according to the state and characteristics of each of the power storage devices 13 to 16, and the determined power amount is The power is output to each of the first power conversion device drive pattern correction unit 402 and the second power conversion device drive pattern correction unit 403. As the state of each of the power storage devices 13 to 16, a charged state (SOC: State Of Charge) and a deteriorated state (SOH: State Of Health) are conceivable. These states are estimated based on measurement signals output from sensors provided in the power storage devices 13 to 16, for example, voltage sensors, current sensors, and temperature sensors, and characteristics of the power storage devices 13 to 16, for example. can do. The amount of electric power input / output to / from each of power storage devices 13-16 is the value of each of power storage devices 13-16 with respect to the average value of each state of power storage devices 13-16 (1/2 of the deviation between the maximum value and the minimum value). It is determined according to the state variation (difference).

In FIG. 4, a single arrow indicates a signal flow from the power storage device input / output power amount determination unit 401 to each of the first power conversion device drive pattern correction unit 402 and the second power conversion device drive pattern correction unit 403. Actually, however, the power storage devices 13 to 16 are not supplied from the power storage device input / output power amount determination unit 401 to the first power conversion device drive pattern correction unit 402 and the second power conversion device drive pattern correction unit 403, respectively. The amount of power input and output to each is transmitted as a signal.

The first power conversion device drive pattern correction unit 402 is configured so that each of the first small conversion devices 3 to 6 constituting the first power conversion device 7 is based on the amount of power determined by the power storage device input / output power amount determination unit 401. The switching drive pattern correction command value is output to the control device 35 so as to correct the switching drive pattern calculated by comparing the target voltage signal transmitted from the central control device 2 with the carrier.

The second power conversion device drive pattern correction unit 403 includes each of the first small-sized conversion devices 8 to 11 constituting the second power conversion device 12 based on the amount of power determined by the power storage device input / output power amount determination unit 401. The switching drive pattern correction command value is output to the control device 35 so as to correct the switching drive pattern calculated by comparing the target voltage signal transmitted from the central control device 2 with the carrier.

Further explanation will be continued, but from here on, the case where the state of charge is used as the state of the power storage devices 13 to 16 will be described as an example.

As the states of the power storage devices 13 to 16, a deteriorated state may be used, or both a charged state and a deteriorated state may be used.
(Operation when charge states of power storage devices 13 to 16 are substantially equal)
First, the operation when the charging states of the power storage devices 13 to 16 are substantially equal will be described with reference to FIGS.

FIG. 5 shows the state of charge of each of the power storage devices 13-16. The horizontal axis indicates the number (sign) of the power storage device, and the vertical axis indicates the state of charge of each of the power storage devices 13 to 16 at an arbitrary measurement timing. As shown in FIG. 5, each of power storage devices 13 to 16 is in a state where the state of charge is substantially equal (allowable range in which the difference in state of charge does not affect the variation in life), and in this state, the first power conversion device Power is input via 7, and power is output via the second power converter 12.

FIG. 6 shows the amount of electric power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16. The horizontal axis indicates the number (sign) of the first small conversion device, and the vertical axis is input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 at the same timing as the measurement timing of FIG. 3 shows the amount of power in a period of one cycle of the target voltage shown in FIG. When the charging states of the power storage devices 13 to 16 are substantially equal, as shown in FIG. 6, the amounts of electric power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 are made substantially equal to each other. Hold approximately equal charge states of ~ 16.

FIG. 7 shows the amount of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11. The horizontal axis indicates the number (sign) of the second small conversion device, and the vertical axis is output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 at the same timing as the measurement timing of FIG. The electric energy in the period for 1 cycle of target voltages shown in FIG. 3 is shown. When the charging states of the power storage devices 13 to 16 are substantially equal, as shown in FIG. 7, the amounts of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 are substantially equal, and the power storage device 13 Hold approximately equal charge states of ~ 16.

In this case, the amount of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 is made substantially equal, and the amount of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 is almost the same. As the switching drive pattern control for equalizing, the switching drive patterns in each of the first small conversion devices 3 to 6 are replaced every predetermined time, and the switching drive patterns in each of the second small conversion devices 8 to 11 are changed for a predetermined time. It is conceivable to replace them every time.

Specifically, after a predetermined period of time, the voltage pattern input to the AC side connection terminal 33 of the first small conversion device 3 shown in FIG. 3B is the first small conversion device 4 shown in FIG. The voltage pattern input to the AC side connection terminal 33 of the first small-sized conversion device 4 shown in FIG. 3C is the voltage pattern input to the AC side connection terminal 33 of FIG. The voltage pattern input to the AC side connection terminal 33 of the first small conversion device 5 shown in FIG. 3D is the voltage pattern input to the AC side connection terminal 33 of the small conversion device 5 as shown in FIG. The voltage pattern input to the AC side connection terminal 33 of the first small conversion device 6 shown in FIG. 3E is the voltage pattern input to the AC side connection terminal 33 of the first small conversion device 6 shown in FIG. Input to the AC side connection terminal 33 of the first small converter 3 shown in FIG. The carrier signal-transmitted from the central control device 2 to the respective control devices 35 of the first small conversion devices 3 to 6 is transferred to the first power so that the four voltage patterns are sequentially switched. The switching drive pattern correction unit 402 may be replaced by the switching drive pattern correction command value transmitted to the respective control devices 35 of the first small-sized conversion devices 3 to 6.

According to such carrier replacement, the sum of the voltages input to the AC side connection terminals 33 of the first small conversion devices 3 to 6 when the carrier replacement is completed is almost equal, and the first small conversion is performed. The total amount of electric power obtained by the product of the voltage input to each AC side connection terminal 33 of each of the devices 3 to 6 and the AC current flowing through each AC side connection terminal 33 of each of the first small converters 3 to 6, that is, The sum of the areas of the enclosed portions of the waveform obtained by multiplying the rectangular wave indicating the voltage and the sine wave indicating the alternating current becomes substantially equal. Accordingly, the amounts of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 are substantially equal, and the power storage devices 13 to 16 can be kept in an approximately equal charge state.

Here, the method of shifting the carriers that are signal-transmitted one by one from the central control device 2 to the respective control devices 35 of the first small conversion devices 3 to 6 has been described, but other shifting methods may be used. (When the carrier makes a round, each of the four carriers only needs to be assigned once to each of the first small conversion devices 3 to 6).

Also in the second small conversion devices 8 to 11, the central control device 2 to the second small conversion device 8 so that the four voltage patterns are sequentially replaced in the same manner as the switching drive pattern replacement of the first small conversion devices 3 to 6. The switching drive pattern correction signal transmitted from the second power conversion device drive pattern correction unit 403 to the control device 35 of each of the second small conversion devices 8 to 11 It may be changed according to the command value.

According to such replacement, the sum of the voltages output from the AC side connection terminals 33 of the second small conversion devices 8 to 11 when the carrier replacement is completed is almost equal, and the second small conversion device 8 To 11, the total amount of electric power obtained by the product of the voltage output from each AC side connection terminal 33 and the AC current flowing through each AC side connection terminal 33 of the second small converters 8 to 11, that is, the voltage The sum of the areas of the enclosed portions of the waveform obtained by multiplying the rectangular wave shown by the sine wave showing the alternating current becomes substantially equal. Therefore, the amounts of power output from power storage devices 13 to 16 to second small conversion devices 8 to 11 are substantially equal, and the power storage devices 13 to 16 can be kept in an approximately equal charge state.

In addition, the amount of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 is made substantially equal, and the amount of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 is made substantially equal. In addition to rotating the switching drive patterns of a plurality of small conversion devices in the power conversion device, the switching drive pattern control for performing the switching drive pattern (rectangular shape) of the small conversion device having a long on-time of the switching element in a half cycle is included. Wave) is divided into several pulses in the pulse width direction, and a part of this divided pulse is separated and incorporated into the switching drive pattern of other small converters with short on-time of switching elements in half cycle , Switching in half cycle of multiple small converters in power converters Successive portions of the switching drive pattern as the ON time of the child is approximately equal, it is considered that reclassified.

According to such a rearrangement, the voltage input to each AC side connection terminal 33 of the first small conversion devices 3 to 6 and the AC current flowing to each AC side connection terminal 33 of the first small conversion devices 3 to 6. And the total amount of electric power obtained by the product of, and the voltage output from each AC side connection terminal 33 of the second small conversion devices 8 to 11 and each AC side connection terminal 33 of the second small conversion devices 8 to 11. The sum of the amounts of electric power obtained by the product of the alternating current flowing through the current, that is, the sum of the areas of the enclosed portions of the waveform obtained by multiplying the rectangular wave indicating the voltage and the sine wave indicating the alternating current becomes substantially equal.
(Operation when there are variations in the state of charge of power storage devices 13 to 16)
Next, the operation when there are variations in the state of charge of the power storage devices 13 to 16 will be described with reference to FIGS.

As described above, the amount of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 is made substantially equal, and the amount of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 Even if the switching of the first small conversion devices 3 to 6 and the second small conversion devices 8 to 11 is controlled so that the power storage devices 13 to 16 are charged and discharged, Variations in the state of charge of the power storage devices 13 to 16 occur due to differences in characteristics of the characteristics of .about.16.

Therefore, in this embodiment, when the variation in the charging state of the power storage devices 13 to 16 exceeds a predetermined value, the amount of input power of each of the first small conversion devices 3 to 6 according to the variation of the power storage devices 13 to 16 , And the output power amounts of the second small conversion devices 8 to 11, respectively, and based on this, the switching drive patterns of the first small conversion devices 3 to 6 and the second small conversion devices 8 to 11, respectively. Is controlling.

FIG. 8 shows the state of charge of each of the power storage devices 13-16. The horizontal axis indicates the number (sign) of the power storage device, and the vertical axis indicates the state of charge of each of the power storage devices 13 to 16 at an arbitrary measurement timing. As shown in FIG. 8, power storage devices 13 to 16 are in different charged states. Specifically, among the power storage devices 13 to 16, the power storage device 13 has the smallest charge state, the power storage device 16 has the largest charge state, and the power storage device 13, the power storage device 14, the power storage device 15, and the power storage device 16 In order, the state of charge is large. In this state, the power storage devices 13 to 16 input power via the first power conversion device 7 and output power via the second power conversion device 12.

FIG. 9 shows the amount of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16. The horizontal axis indicates the number (sign) of the first small conversion device, and the vertical axis is input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 at the same timing as the measurement timing of FIG. 3 shows the amount of power in a period of one cycle of the target voltage shown in FIG. When the charging states of power storage devices 13 to 16 are different, as shown in FIG. 9, the amount of power input to the power storage device having the smallest charging state among power storage devices 13 to 16 is the largest, and the charging state is the highest. The amount of electric power input to a large power storage device is minimized, the input power is decreased as the state of charge increases, and the state of charge is adjusted so that the different state of charge of power storage devices 13 to 16 is approximately equal. .

FIG. 10 shows the amount of power output from the power storage devices 13-16 to the second small conversion devices 8-11. The horizontal axis indicates the number (sign) of the second small conversion device, and the vertical axis is output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 at the same timing as the measurement timing of FIG. The electric energy in the period for 1 cycle of target voltages shown in FIG. 3 is shown. When the charging states of power storage devices 13 to 16 are different, as shown in FIG. 10, the amount of power output from the power storage device having the smallest charging state among power storage devices 13 to 16 is the smallest, and the charging state is the lowest. The amount of power output from the large power storage device is maximized, and the output power is increased as the charge state increases, and the charge state is adjusted so that the different charge states of the power storage devices 13 to 16 are substantially equal. .

In this case, the amount of electric power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 is changed according to the state of charge of the power storage devices 13 to 16, and the second small conversion device 8 from the power storage devices 13 to 16 is changed. As the switching drive pattern control for varying the amount of power output to 11 to 11 depending on the state of charge of the power storage devices 13 to 16, the switching drive pattern in each of the first small conversion devices 3 to 6 is used as the input power amount. The power storage devices 13 to 16 are fixed until the different charging states of the power storage devices 13 to 16 are substantially equal, and the switching drive pattern in each of the second small conversion devices 8 to 11 is replaced according to the output power amount. It is conceivable that the different charging states are fixed until they are substantially equal.

Specifically, the voltage pattern input to the AC side connection terminal 33 of the first small conversion device 3 shown in FIG. 3B is the AC side connection terminal of the first small conversion device 6 shown in FIG. A voltage pattern input to the AC side connection terminal 33 of the first small conversion device 4 shown in FIG. 3C corresponds to a voltage pattern input to the first small conversion device 5 shown in FIG. The voltage pattern input to the AC side connection terminal 33 of the first small conversion device 5 shown in FIG. 3D is changed to the voltage pattern input to the AC side connection terminal 33 as shown in FIG. The voltage pattern input to the AC side connection terminal 33 of the first small-sized conversion device 6 shown in FIG. 3E is the voltage pattern input to the AC side connection terminal 33 of the conversion device 4 in FIG. Voltage pattern input to the AC side connection terminal 33 of the first small conversion device 3 shown The carrier signal-transmitted from the central controller 2 to the respective control devices 35 of the first small converters 3 to 6 is driven by the first power converter so that the four voltage patterns are reversed and switched. What is necessary is just to replace with the command value for switching drive pattern correction | amendment transmitted to the control apparatus 35 of each of the 1st small converters 3-6 from the pattern correction | amendment part 402. FIG.

According to such replacement of the carriers, the amount of electric power input from the first small conversion device 3 to the power storage device 13 having the smallest charge state is the largest in accordance with the charge states of the power storage devices 13 to 16, and The amount of power input from the first small conversion device 6 to the largest power storage device 16 becomes the smallest, and the input power decreases as the state of charge increases, and each AC side of the first small conversion devices 3 to 6 The amount of electric power obtained by the product of the voltage input to the connection terminal 33 and the AC current flowing through each AC side connection terminal 33 of the first small converters 3 to 6, that is, a rectangular wave indicating the voltage and a sine indicating the AC current The area surrounded by the waveform obtained by multiplying the wave is smaller in the order of the first small conversion device 3, the first small conversion device 4, the first small conversion device 5, and the first small conversion device 6. Kunar. Therefore, the amount of power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 can be changed according to the charging state of the power storage devices 13 to 16, and the different charging states of the power storage devices 13 to 16 are almost the same. The state of charge can be adjusted to be equal.

In other words, in the second small conversion devices 8 to 11, the voltage pattern of the second small conversion device 8 is different from the switching drive pattern replacement of the first small conversion devices 3 to 6 in other words. 3B, the voltage pattern of the second small conversion device 9 is shown in FIG. 3C, the voltage pattern of the second small conversion device 10 is shown in FIG. 3D, and the second small conversion device. 11 is the voltage pattern shown in FIG. 3E, so that the carrier signal-transmitted from the central controller 2 to the respective control devices 35 of the second small conversion devices 8 to 11 What is necessary is just to replace with the command value for switching drive pattern correction | amendment signal-transmitted from the power converter drive pattern correction | amendment part 403 to each control apparatus 35 of the 2nd small conversion devices 8-11.

According to such replacement, the amount of power output from the power storage device 13 having the smallest charge state to the second small conversion device 8 is the smallest and the charge state is the largest, depending on the state of charge of the power storage devices 13 to 16. The amount of power output from the power storage device 16 to the second small conversion device 11 is the largest, and the output power increases as the state of charge increases, so that the AC connection of each of the second small conversion devices 8 to 11 is increased. The amount of power obtained by the product of the voltage input to the terminal 33 and the AC current flowing through each AC side connection terminal 33 of the second small converters 8 to 11, that is, a rectangular wave indicating the voltage and a sine wave indicating the AC current The area of the enclosed portion of the waveform obtained by multiplying is calculated in the order of the second small conversion device 8, the second small conversion device 9, the second small conversion device 10, and the second small conversion device 11. Kikunaru. Therefore, the amount of power output from the power storage devices 13 to 16 to the second small conversion devices 8 to 11 can be changed according to the charging state of the power storage devices 13 to 16, and the different charging states of the power storage devices 13 to 16 are almost the same. The state of charge can be adjusted to be equal.

The amount of electric power input from the first small conversion devices 3 to 6 to the power storage devices 13 to 16 is changed according to the state of charge of the power storage devices 13 to 16, and the power storage devices 13 to 16 are changed to the second small conversion devices 8 to 11. Switching drive pattern control for varying the amount of output electric power according to the state of charge of the power storage devices 13 to 16 includes switching the switching drive patterns of a plurality of small conversion devices in the power conversion device, Divide the switching drive pattern (rectangular wave) of the device into several pulses in the pulse width direction, separate a part of this divided pulse, and incorporate it into the switching drive pattern of other small converters to convert power The on-time of the switching element in a half cycle of a plurality of small conversion devices in the device depends on the state of charge of power storage devices 13-16 As changes, it is conceivable to rearrange some of the switching drive pattern.

For example, in order to minimize the input power amount of the first small conversion device 6 corresponding to the power storage device 16 having the largest charge state, a part is separated from the switching drive pattern corresponding to the voltage pattern shown in FIG. Thus, the pulse width is reduced to reduce the switching on time. The separated portion is incorporated into a switching drive pattern corresponding to the voltage pattern shown in FIG. 3B, for example, to widen the pulse width to increase the switching on time, and corresponds to the power storage device 13 having the smallest charged state. The input power amount of the first small conversion device 3 is increased.

According to such a rearrangement, the voltage input to each AC side connection terminal 33 of the first small conversion devices 3 to 6 and the AC current flowing to each AC side connection terminal 33 of the first small conversion devices 3 to 6. And the amount of electric power obtained by the product of, and the voltage output from the AC side connection terminal 33 of each of the second small conversion devices 8 to 11 and the AC side connection terminal 33 of each of the second small conversion devices 8 to 11 The amount of electric power obtained by the product of the alternating current, that is, the area of the enclosed portion of the waveform obtained by multiplying the rectangular wave indicating the voltage and the sine wave indicating the alternating current is the charged state of the power storage devices 13-16. It changes depending on the situation.

In this embodiment, the switching of both the first power conversion device 7 and the second power conversion device 12 is controlled by a command signal from the central control device 2 according to the state of charge of the power storage devices 13 to 16. The charge states of the power storage devices 13 to 16 are adjusted so that the charge states of the power storage devices 13 to 16 are uniform. This adjustment is performed by either the first power conversion device 7 or the second power conversion device 12. You may make it carry out by.

In the present embodiment described above, it is possible to supply power to the single-phase AC power system 20 after the power supply device 1 is linked to the power generation system 19. Even when the output of the system 19 is insufficient, power can be stably supplied to the single-phase AC power system 20. On the other hand, when the output of the power generation system 19 is surplus with respect to the request of the single-phase AC power system 20, the surplus power is stored in the power supply device 1, and the stored power is used as the output of the power generation system 19. Since it can be supplied to the single-phase AC power system 20 when it is insufficient, the energy generated in the power generation system 19 can be used effectively. At this time, in this embodiment, the switching drive patterns of the first small conversion devices 3 to 6 and the second small conversion devices 8 to 11 are controlled so that the charge states of the power storage devices 13 to 16 are made uniform. Since the charging states of the devices 13 to 16 are adjusted, it is possible to suppress the variation in the life of the power storage devices 13 to 16 caused by the variation in the charging state of the power storage devices 13 to 16. The service life of the power supply device 1 can be extended. Therefore, in this embodiment, it is possible to achieve both stabilization of power supply by the power supply device 1 and extension of the life of the power supply device 1.

A second embodiment will be described with reference to FIG.

In the second embodiment, the power supply apparatus 101 having the same configuration as that of the power supply apparatus 1 of the first embodiment is provided, the single-phase AC power system 20 is connected to the power supply side connection terminal 17, the AC load 22 is connected to the load side connection terminal 18, respectively. Electrically connected. A reactor 21 is provided between a terminal on one side of the AC side connection terminal 17 of the first power converter 7 and the single-phase AC power system 20, and is electrically connected in series between the two.

The reactor 21 is a stationary induction device using an inductor that is a winding wound with an electric wire. In the case of the second embodiment, the reactor 21 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 101 side in accordance with the AC voltage on the power supply side, here the single-phase AC power system 20 side. . The reactor 21 also functions as a filter that smoothes the voltage and current between the single-phase AC power system 20 and the power supply device 101.

The power supply device 101 of the second embodiment also includes a central control device similar to that of the power supply device 1 of the first embodiment, but is not shown in FIG. 11 for the sake of simplicity. .

A power supply device 101 is provided between the single-phase AC power system 20 and the AC load 22, and power output from the single-phase AC power system 20 is supplied to the power storage devices 13 to 16 via the first power converter 7. The power storage devices 13 to 16 are charged, and at the same time, the electric power output from the power storage devices 13 to 16 is supplied to the AC load 22 via the second power conversion device 12, thereby the single-phase AC power system 20 In addition to being able to supply power to the AC load 22 while being connected to the power source, even when the supply of power from the single-phase AC power system 20 is stopped, the power is stably supplied from the power storage devices 13 to 16 to the AC load 22. Can be supplied.

When charging the power storage devices 13 to 16, power may not be supplied from the power storage devices 13 to 16 to the AC load 22. Further, electric power may be supplied from the power storage devices 13 to 16 to the AC load 22 without charging the power storage devices 13 to 16. Furthermore, power may be supplied from the power storage devices 13 to 16 to the single-phase AC power system 20, or power may be supplied from the power storage devices 13 to 16 to both the single-phase AC power system 20 and the AC load 22. .

A third embodiment will be described with reference to FIG.

In the third embodiment, the power supply device 102 having the same configuration as the power supply device 1 of the first embodiment is provided, the power generation system (power generation device) 19 is provided in the power supply side connection terminal 17, the AC load 22 is provided in the load side connection terminal 18, Each is electrically connected. A reactor 21 is provided between a terminal on one side of the AC side connection terminal 17 of the first power conversion device 7 and the power generation system 19, and is electrically connected in series between the two.

In the case of the third embodiment, the reactor 21 is provided to adjust the phase and amplitude of the AC voltage on the power supply apparatus 102 side in accordance with the AC voltage on the power supply side, here the power generation system 19 side. The reactor 21 also functions as a filter that smoothes the voltage and current between the power generation system 19 and the power supply device 102.

The power supply device 102 of the third embodiment also includes a central control device similar to that of the power supply device 1 of the first embodiment, but is not shown in FIG. 12 for the sake of simplicity. .

A power supply device 102 is provided between the power generation system 19 and the AC load 22, and the power output from the power generation system 19 is supplied to the power storage devices 13 to 16 via the first power conversion device 7 to supply the power storage devices 13 to 16. At the same time, the power output from the power storage devices 13 to 16 is supplied to the AC load 22 via the second power conversion device 12, so that the power is supplied to the AC load 22 while being connected to the power generation system 19. Can be supplied to the AC load 22 from the power storage devices 13 to 16 even when the supply of power from the power generation system 19 is stopped.

When charging the power storage devices 13 to 16, power may not be supplied from the power storage devices 13 to 16 to the AC load 22. Further, electric power may be supplied from the power storage devices 13 to 16 to the AC load 22 without charging the power storage devices 13 to 16.

A fourth embodiment will be described with reference to FIG.

In the fourth embodiment, the power supply apparatus 103 having the same configuration as that of the power supply apparatus 1 of the first embodiment is provided, the DC power system 23 is connected to the power supply side connection terminal 17, and the AC load 22 is connected to the load side connection terminal 18. Connected to.

As described in the first embodiment, the small converters 3 to 6 are constituted by full bridge inverter circuits. Full-bridge inverter circuit can convert DC voltage to AC voltage (positive and negative voltage), but does not convert in negative direction, but converts DC voltage to positive AC voltage, ie, voltage 0 and positive AC voltage It is also possible to do. If this principle is used, the DC power system 23 can be used as a kind of single-phase AC power system, and the power output from the DC power system 23 can be used as the first power converter 7. Conversion is performed by each of the small-sized conversion devices 3 to 6, and the converted electric power can be supplied to the power storage devices 13 to 16 to charge each of the power storage devices 13 to 16.

The power supply device 103 according to the fourth embodiment also includes a central control device similar to that of the power supply device 1 according to the first embodiment. However, in FIG. 13, the illustration thereof is omitted for simplification. .

The power supply device 103 is provided between the DC power system 23 and the AC load 22, and the power output from the DC power system 23 is supplied to the power storage devices 13 to 16 via the first power conversion device 7 to supply the power storage device 13. To 16 and simultaneously supplying the power output from the power storage devices 13 to 16 to the AC load 22 via the second power converter 12, so that the AC load is connected to the AC power system 23. 22 can be supplied with power, and even when the supply of power from the DC power system 23 is stopped, power can be stably supplied from the power storage devices 13 to 16 to the AC load 22.

When charging the power storage devices 13 to 16, power may not be supplied from the power storage devices 13 to 16 to the AC load 22. Further, electric power may be supplied from the power storage devices 13 to 16 to the AC load 22 without charging the power storage devices 13 to 16. Furthermore, power may be supplied from the power storage devices 13 to 16 to the DC power system 23, or power may be supplied from the power storage devices 13 to 16 to both the DC power system 23 and the AC load 22.

Further, the first power conversion device 7 is caused to function as a device that converts direct current power into direct current power, for example, a DC-DC converter, and the direct current power output from the direct current power system 23 is converted into the first power conversion device 7. Each of the power storage devices 13 to 16 can be charged by being divided into DC power for each of the power storage devices 13 to 16 by the small conversion devices 3 to 6 and supplied to each of the power storage devices 13 to 16.

The fifth embodiment will be described with reference to FIG.

5th Example is a modification of 4th Example, is equipped with the power supply device 104 of the same structure as the power supply device 1 of 1st Example, and the other side of the alternating current side connection terminal 33 of the 1st small converter 4 is provided. The terminal is electrically connected to one terminal of the power supply side connection terminal 24, and one terminal of the AC side connection terminal 33 of the first small-sized conversion device 5 is electrically connected to the other terminal of the power supply side connection terminal 24. And the power generation system 19 is electrically connected to the power supply side connection terminal 24 to electrically connect the first small conversion device 4 and the first small conversion device 5 via the power generation system 19. I try to connect. A reactor 21 is electrically connected in series between one terminal of the power supply side connection terminal 24 and the power generation system 19.

In the case of the fifth embodiment, the reactor 21 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 104 side in accordance with the AC voltage on the power supply side, here the power generation system 19 side. The reactor 21 also functions as a filter that smoothes the voltage and current between the power generation system 19 and the power supply device 104.

The power supply device 104 of the fifth embodiment also includes a central control device similar to that of the power supply device 1 of the first embodiment, but is not shown in FIG. 14 for simplicity of illustration. .

A power supply device 103 is provided between the DC power system 23 and the AC load 22, and the power output from the DC power system 23 and / or the power generation system 19 or both via the first power conversion device 7 is stored in the power storage devices 13 to 16. To charge the power storage devices 13 to 16 and simultaneously supply the power output from the power storage devices 13 to 16 to the AC load 22 via the second power conversion device 12. While being connected, power can be supplied to the AC load 22, and even when the supply of power from the DC power system 23 and / or the power generation system 19 is stopped, the power storage devices 13 to 16 can supply power to the AC load 22. Power can be supplied stably.

The sixth embodiment will be described with reference to FIG.

The sixth embodiment is a modification of the first embodiment. In the first embodiment, the power supply device 1 constitutes a single-phase power supply device. In the sixth embodiment, the power supply device 1 of the first embodiment is provided for three phases, and a three-phase power supply device 50 is configured.

The three-phase power supply device 50 includes a U-phase power supply device 1A, a V-phase power supply device 1B, and a W-phase power supply device 1C. The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C all have the same configuration as the power supply device 1 of the first embodiment.

The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C of the sixth embodiment also have a central control device similar to the power supply device 1 of the first embodiment, but in FIG. The illustration is omitted for simplification of illustration.

The power supply side connection terminal 17A of the U-phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the one side terminal of the power supply side connection terminal 17C of the W phase power supply device 1C generate three-phase AC power. It is electrically connected to the system 31. The power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the other side terminal of the power supply side connection terminal 17C of the W phase power supply device 1C are electrically connected to the connection point 28. ing. The connection point 28 corresponds to the neutral point of the three-phase connection. That is, the power supply sides of the U-phase power supply device 1A, the V-phase power supply device 1B, and the W-phase power supply device 1C are star (Y) connected.

One side of the load side connection terminal 18A of the U phase power supply device 1A, the load side connection terminal 18B of the V phase power supply device 1B, and the load side connection terminal 18C of the W phase power supply device 1C is electrically connected to the three-phase AC power system 30. It is connected to the. The load-side connection terminal 18A of the U-phase power supply device 1A, the load-side connection terminal 18B of the V-phase power supply device 1B, and the other terminal of the load-side connection terminal 18C of the W-phase power supply device 1C are electrically connected to the connection point 26. ing. The connection point 26 corresponds to the neutral point of the three-phase connection. That is, the load side of the U-phase power supply 1A, V-phase power supply 1B, and W-phase power supply 1C is star (Y) connected.

A three-phase power supply device 50 is provided between the power generation system 31 and the three-phase AC power system 30, and the power output from the power generation system 31 is stored in the power storage devices 13A to 16A via the first

power conversion devices

7A, 7B, and 7C. , 13B to 16B, 13C to 16C to charge the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C, and at the same time, the power storage devices 13A to 16A via the second

power conversion devices

12A, 12B, and 12C. , 13B to 16B, and 13C to 16C are supplied to the three-phase AC power system 30 to supply power to the three-phase AC power system 30 while being connected to the power generation system 31. Even when the supply of power from the power generation system 31 is stopped, the three-phase AC power system 3 from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. Stable power can be supplied to the.

When charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C, the power may not be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC power system 30. In addition, power may be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC power system 30 without charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C.

The seventh embodiment will be described with reference to FIG.

The seventh embodiment includes a three-phase power supply device 501 having the same configuration as the three-phase power supply device 50 of the sixth embodiment, and includes a power supply side connection terminal 17A of the U phase power supply apparatus 1A and a power supply side connection terminal of the V phase power supply apparatus 1B. 17B, the three-phase AC power system 30 is connected to the power supply side connection terminal 17C of the W phase power supply device 1C, the load side connection terminal 18A of the U phase power supply device 1A, the load side connection terminal 18B of the V phase power supply device 1B, and the W phase power supply device. A three-phase AC load 27 is electrically connected to the load-side connection terminal 18C of 1C. Between the power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, the one side terminal of the power supply side connection terminal 17C of the W phase power supply device 1C and the three-phase AC power system 30. Is provided with a reactor 29, which is electrically connected in series between the two.

The reactor 29 is a stationary induction device that uses an inductor that is a wire wound with an electric wire. In the case of the seventh embodiment, the reactor 29 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 501 side in accordance with the AC voltage on the power supply side, here the three-phase AC power system 30 side. . The reactor 29 also functions as a filter that smoothes the voltage and current between the three-phase AC power system 30 and the power supply device 501.

The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C of the seventh embodiment also have a central control device similar to the power supply device 1 of the first embodiment, but in FIG. The illustration is omitted for simplification of illustration.

A power supply device 501 is provided between the three-phase AC power system 30 and the three-phase AC load 27, and the power output from the three-phase AC power system 30 is stored in the power storage device via the

first power converters

7A, 7B, and 7C. The power storage devices 13A to 16A, 13B to 16B, and 13C to 16C are supplied to charge the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. At the same time, the power storage devices are connected via the second

power conversion devices

12A, 12B, and 12C. By supplying the power output from 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27, the power is supplied to the three-phase AC load 27 while being connected to the three-phase AC power system 30. In addition, even when the supply of power from the three-phase AC power system 30 is stopped, the three-phase AC load 27 is supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. It is possible to stably supply power.

When charging the power storage devices 13A to 16A, 13B to 16B, 13C to 16C, the power may not be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27. In addition, the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C may be supplied to the three-phase AC load 27 without charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. Further, power is supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC power system 30, or from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. Electric power may be supplied to both the system 30 and the three-phase AC load 27.

The eighth embodiment will be described with reference to FIG.

In the eighth embodiment, a three-phase power supply device 502 having the same configuration as the three-phase power supply device 50 of the sixth embodiment is provided, the power supply side connection terminal 17A of the U phase power supply device 1A, and the power supply side connection terminal of the V phase power supply device 1B. The power generation system (power generation device) 31 is connected to the power supply side connection terminal 17C of the 17B, W phase power supply device 1C, the load side connection terminal 18A of the U phase power supply device 1A, the load side connection terminal 18B of the V phase power supply device 1B, and the W phase power supply. A three-phase AC load 27 is electrically connected to the load side connection terminal 18C of the device 1C.

A reactor is connected between the power generation system 31 and the power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the power supply side connection terminal 17C of the W phase power supply device 1C. 29 are electrically connected in series.

In the case of the seventh embodiment, the reactor 29 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 502 side in accordance with the AC voltage on the power supply side, here the power generation system 31 side. The reactor 29 also functions as a filter that smoothes the voltage and current between the power generation system 31 and the power supply device 502.

The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C of the eighth embodiment also have a central controller similar to the power supply device 1 of the first embodiment, but in FIG. The illustration is omitted for simplification of illustration.

A power supply device 501 is provided between the power generation system 31 and the three-phase AC load 27, and the electric power output from the power generation system 31 via the first

power conversion devices

7A, 7B, and 7C is stored in the power storage devices 13A to 16A, 13B to 16B, 13C to 16C are supplied to charge the power storage devices 13A to 16A, 13B to 16B, 13C to 16C, and at the same time, the power storage devices 13A to 16A, 13B to By supplying the power output from 16B, 13C to 16C to the three-phase AC load 27, it is possible to supply power to the three-phase AC load 27 while being linked to the power generation system 31, and from the power generation system 31. Even when the supply of power is stopped, power is stably supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27. It is possible to feed.

When charging the power storage devices 13A to 16A, 13B to 16B, 13C to 16C, the power may not be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27. In addition, the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C may be supplied to the three-phase AC load 27 without charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C.

A ninth embodiment will be described with reference to FIG.

In the ninth embodiment, a three-phase power supply device 503 having the same configuration as the three-phase power supply device 50 of the sixth embodiment is provided, the power supply side connection terminal 17A of the U phase power supply device 1A, and the power supply side connection terminal of the V phase power supply device 1B. The DC power system 35 is connected to the power supply side connection terminal 17C of the 17B, W phase power supply device 1C, the load side connection terminal 18A of the U phase power supply device 1A, the load side connection terminal 18B of the V phase power supply device 1B, and the W phase power supply device 1C. A three-phase AC load 27 is electrically connected to the load side connection terminal 18C.

The power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the power supply side connection terminal 17C of the W phase power supply device 1C are electrically connected to the connection point 33. The DC power system 35 is electrically connected to the positive electrode side. The power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the other side terminal of the power supply side connection terminal 17C of the W phase power supply device 1C are electrically connected to the connection point 34. The DC power system 35 is electrically connected to the negative electrode side.

The terminals on the other side of the AC side connection terminals 33A, 33B, 33C of the first small conversion devices 4A, 4B, 4C are electrically connected to terminals on one side of the power source

side connection terminals

24A, 24B, 24C. One side terminals of the AC side connection terminals 33A, 33B, 33C of the first

small conversion devices

5A, 5B, 5C are electrically connected to the other side terminals of the power source

side connection terminals

24A, 24B, 24C. The power generation system 31 is electrically connected to the power supply

side connection terminals

24A, 24B, and 24C. Accordingly, the first small conversion devices 4A, 4B, 4C and the first

small conversion devices

5A, 5B, 5C are electrically connected via the power generation system 31. A reactor 19 is electrically connected in series between one of the power supply side connection terminals 24 </ b> A, 24 </ b> B, and 24 </ b> C and the power generation system 31.

In the case of the eighth embodiment, the reactor 29 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 503 side in accordance with the AC voltage on the power supply side, here the power generation system 31 side. The reactor 29 also functions as a filter that smoothes the voltage and current between the power generation system 31 and the power supply device 503.

The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C of the ninth embodiment also have a central control device similar to the power supply device 1 of the first embodiment, but in FIG. The illustration is omitted for simplification of illustration.

A power supply device 503 is provided between the DC power system 35 and the three-phase AC load 27, and the power output from the DC power system 35 and / or the power generation system 31 via the

first power converters

7A, 7B, and 7C. Is supplied to the power storage devices 13A to 16A, 13B to 16B, 13C to 16C to charge the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C, and at the same time through the second

power conversion devices

12A, 12B, and 12C. By supplying the power output from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27, the power is supplied to the three-phase AC load 27 while being connected to the DC power system 35. Even when the supply of power from the DC power system 35 and / or the power generation system 31 is stopped, the power storage device 13A 16A, 13B ~ 16B, stably from @ 13 C ~ 16C into a three-phase AC load 27 may supply power.

When charging the power storage devices 13A to 16A, 13B to 16B, 13C to 16C, the power may not be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC load 27. In addition, the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C may be supplied to the three-phase AC load 27 without charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. Further, power may be supplied from the power storage devices 13A to 16A, 13B to 16B, 13C to 16C to the DC power system 35, or the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C may be connected to the DC power system 35. Electric power may be supplied to both of the phase AC loads 27.

The tenth embodiment will be described with reference to FIG.

In the tenth embodiment, a three-phase power supply device 504 having the same configuration as the three-phase power supply device 50 of the sixth embodiment is provided, the power supply side connection terminal 17A of the U phase power supply device 1A, and the power supply side connection terminal of the V phase power supply device 1B. 17B, a DC power supply 36 is connected to the power supply side connection terminal 17C of the W phase power supply device 1C, a load side connection terminal 18A of the U phase power supply device 1A, a load side connection terminal 18B of the V phase power supply device 1B, and a load of the W phase power supply device 1C. The three-phase AC power system 30 is electrically connected to the side connection terminals 18C.

The power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the power supply side connection terminal 17C of the W phase power supply device 1C are electrically connected to the connection point 33. The DC power source 36 is electrically connected to the positive electrode side. The power supply side connection terminal 17A of the U phase power supply device 1A, the power supply side connection terminal 17B of the V phase power supply device 1B, and the other side terminal of the power supply side connection terminal 17C of the W phase power supply device 1C are electrically connected to the connection point 34. The DC power source 36 is electrically connected to the negative electrode side.

The U-phase power supply device 1A, V-phase power supply device 1B, and W-phase power supply device 1C of the tenth embodiment also have a central control device similar to the power supply device 1 of the first embodiment, but in FIG. The illustration is omitted for simplification of illustration.

A three-phase power supply device 504 is provided between the DC power supply 36 and the three-phase AC power system 30, and the power output from the DC power supply 36 is stored in the power storage devices 13A to 16A via the first

power conversion devices

12A, 12B, and 12C. , 13B to 16B, and 13C to 16C are supplied to the three-phase AC power system 30 to supply power to the three-phase AC power system 30 while being connected to the DC power source 36. Even when the supply of power from the DC power supply 36 is stopped, the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C can stably supply power to the three-phase AC power system 30. It can be supplied.

When charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C, the power may not be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC power system 30. In addition, power may be supplied from the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C to the three-phase AC power system 30 without charging the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. The

first power converters

7A, 7B, and 7C function as a device (converter) that converts direct current and alternating current. However, the first

power conversion devices

7A, 7B, and 7C function as a device that converts direct current power into direct current power, for example, a DC-DC converter. The direct-current power output from the power source 36 is stored in the power storage devices 13A to 16A, 13B to 16B, and 13C by the first small-sized conversion devices 3A to 6A, 3B to 6B, and 3C to 6C of the first

power conversion devices

7A, 7B, and 7C. Or divided into DC power for each of the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C, and charged to each of the power storage devices 13A to 16A, 13B to 16B, and 13C to 16C. it can.

Further, as shown in FIG. 20, the terminals on one side of the power supply side connection terminal 17A of the U phase power supply apparatus 1A, the power supply side connection terminal 17B of the V phase power supply apparatus 1B, and the power supply side connection terminal 17C of the W phase power supply apparatus 1C are The reactor 21 may be provided between the connection point 33 that is electrically connected and the positive electrode side of the DC power supply 36, and may be electrically connected in series between the two. The reactor 21 is provided to adjust the phase and amplitude of the AC voltage on the power supply device 504 side in accordance with the AC voltage on the DC power source 36 side, which can be regarded as an AC power source here. The reactor 21 also functions as a filter that smoothes the voltage and current between the DC power supply 36 and the power supply device 504. The reason why the DC power supply 36 can be regarded as an AC power supply is as described in the fourth embodiment.

Claims

First power having a plurality of first power conversion units capable of power conversion between DC power and AC power, the AC side connection terminals of the plurality of first power conversion units being electrically connected in series. A conversion device;
Second power having a plurality of second power conversion units capable of power conversion between DC power and AC power, the AC side connection terminals of the plurality of second power conversion units being electrically connected in series. A conversion device;
A plurality of power storage devices,
The number of first power conversion units constituting the first power conversion device, the number of second power conversion units constituting the second power conversion device, and the number of power storage devices The number is the same,
Each of the plurality of power storage devices includes one of a plurality of first power conversion units constituting the first power conversion device and a plurality of second power conversions constituting the second power conversion device. Provided in common with any one of the units, and electrically connected to the DC side connection terminals of the corresponding first and second power conversion units,
A power supply device characterized by that.
The power supply device according to claim 1,
Further, based on the state of charge of the plurality of power storage devices, the corresponding power storage of one or both of the first and second power conversion units electrically connected to each of the plurality of power storage devices Having a control device for controlling the amount of power to and from the device;
A power supply device characterized by that.
The power supply device according to claim 2,
The controller is
When there is a power storage device with a relatively small charge state among the plurality of power storage devices, either one of the first and second power conversion units electrically connected to the power storage device or its While controlling the amount of power between both power storage devices,
When the power conversion unit supplies power to the power storage device, the amount of power supplied to the power storage device is made larger than that of the other power conversion units, and power is supplied from the power storage device. If so, make the amount of power from the power storage device smaller than other power conversion units,
A power supply device characterized by that.
The power supply device according to claim 2,
The controller is
If there is a power storage device with a relatively large charge state among the plurality of power storage devices, either one of the first and second power conversion units electrically connected to the power storage device or its While controlling the amount of power between both power storage devices,
When the power conversion unit supplies power to the power storage device, the amount of power supplied to the power storage device is made smaller than that of other power conversion units, and power is supplied from the power storage device. If so, make the amount of power from the power storage device larger than other power conversion units,
A power supply device characterized by that.
The power supply device according to any one of claims 1 to 4,
In addition, it has a reactor,
When any one of the first and second power conversion devices is a side to which a power supply is electrically connected, the AC side connection terminal of the power conversion device to which the power supply is electrically connected is provided. One end of the reactor is electrically connected;
The other end side of the reactor is electrically connected to the power source.
A power supply device characterized by that.
The power supply device according to claim 5,
An AC power system or a power generation device is electrically connected to the other end of the reactor as the power source.
A power supply device characterized by that.
The power supply device according to any one of claims 1 to 4,
When any one of the first and second power conversion devices is a side to which a power supply is electrically connected, the AC side connection terminal of the power conversion device to which the power supply is electrically connected is provided. The DC power system is electrically connected as the power source.
A power supply device characterized by that.
The power supply device according to claim 7,
In addition, it has a reactor,
In the electrical series connection of the AC side connection terminals of a plurality of power conversion units constituting a power conversion device to which the power supply is electrically connected, a power generation device is electrically connected in series via the reactor. Yes,
A power supply device characterized by that.
The power supply device according to any one of claims 1 to 4,
A plurality of the first and second power converters;
The plurality of power storage devices as a set of power storage units, and having a plurality of power storage units,
One of the first power conversion devices, one of the second power conversion devices, and one of the power storage units are used as a set of power supply units, and a plurality of power supply units are provided.
A power supply device characterized by that.
The power supply device according to claim 9, wherein
In addition, it has a reactor,
When any one of the first and second power conversion devices of each of the plurality of power storage units is a side to which a power source is electrically connected, power conversion to which the power source is electrically connected One terminal of the AC side connection terminal of the device is electrically connected to each other to form a neutral point, and one end side of the reactor is electrically connected to the other terminal, respectively. ,
The other end side of the reactor is configured to be electrically connected to the power source.
A power supply device characterized by that.
The power supply device according to claim 10, wherein
A three-phase AC power system or a power generation device is electrically connected to the other end of the reactor as the power source.
A power supply device characterized by that.
The power supply device according to claim 9, wherein
When any one of the first and second power conversion devices of each of the plurality of power storage units is a side to which a power source is electrically connected, power conversion to which the power source is electrically connected A DC power system is electrically connected to the AC side connection terminal of the device as the power source,
A power supply device characterized by that.
The power supply device according to claim 12,
In addition, it has a reactor,
For the electrical series connection of the AC side connection terminals of a plurality of power conversion units constituting each of the power conversion devices to which the power supply is electrically connected, the power generation device is electrically connected in series via the reactor. Being
A power supply device characterized by that.