Energy conversion device

Abstract

Electrical energy conversion device comprising the following: - a plurality of electrical energy converter units (2) connected in parallel, each possessing electrical energy information specifying a relation between a value of electrical power and an efficiency, as well as attribute information of an operating priority level, which is an operating sequence; and - an electrical power load distribution controller (3) for distributing the electrical power to each of the electrical power converter units (2) depending on the power demanded, wherein the electrical power load distribution controller (3) monitors the continuation / termination of electrical power conversion processes of the electrical power converter units (2) taking into account attribute information obtained from each of the electrical power converter units (2), and regulates the electrical power distributed to each of the electrical power converter units (2) by using a first electrical power threshold corresponding to a nominal efficiency of each of the plurality of electrical power converter units (2), a second electrical power threshold corresponding to a maximum efficiency of each of the plurality of electrical power converter units (2), and a third electrical power threshold corresponding to a permissible efficiency,which is an efficiency that becomes a reference efficiency for each of the plurality of electrical energy converter units (2), wherein the electrical power thresholds are information relating to the electrical energy information in the attribute information.

Description

Technical field

[0001] The present invention relates to achieving an increased efficiency of an electricity conversion in an electrical energy conversion device, the electrical energy converter units of which are multistructured in parallel to each other at their input or output ends. State of the art

[0002] Recently, the market for electrical energy storage devices has expanded, for example for photovoltaic energy generation facilities and electric vehicles, emergency energy sources, etc., so that the technical developments of zero-energy houses and zero-energy buildings are gaining attention, in which the purchased electrical power from an electrical energy system is reduced to zero by means of a device whose facilities are combined.

[0003] However, if a plurality of different electrical energy storage devices are used, arranged in parallel in a multi-structured manner, there is a condition under which a better efficiency is achieved when limits are imposed on the number of operating electrical energy storage devices and on their electrical energy load distribution by addressing their charging-discharging electrical energy, rather than when all electrical energy storage devices charge or discharge their electrical power with the same ratios through their electrical energy load distribution.

[0004] In JP 5 272 033 B2, a plurality of electrical power converters are used, each with the same electrical power capacity. The electrical power corresponding to the highest efficiency of each of the electrical power converters, and their rated electrical power, are preferably used, thus implementing an increased efficiency. However, if a plurality of electrical power converters with different electrical power capacities are used, a higher efficiency is achieved under a condition where the electrical power is small when a plurality of electrical power converters with small electrical power capacities are used, than when a single electrical power converter with a large electrical power capacity is used.

[0005] Higher efficiency is achieved under conditions where the electrical power is high, if, among the electrical power converters, a converter with a better efficiency is preferably used, and so on. Since the conditions differ for the sake of increased efficiency, there is a condition under which such use does not lead to increased efficiency, as described in JP 5 272 033 B2.

[0006] DE 11 2007 000 698 T5 discloses techniques relating to a power supply module that utilizes a plurality of sub-power supply modules. In particular, one embodiment combines and controls a plurality of sub-power supply modules with different characteristics to improve the overall efficiency of the power supply module across varying load currents, power outputs, input voltages, and other operating conditions. Furthermore, the power supply module can utilize an adaptive non-linear and non-uniform current / power distribution between its power supply sub-modules.

[0007] US 2011 / 0194319 A1 discloses an AC power supply device comprising a DC power supply for generating DC power, a plurality of, for example, three first DC / AC inverters and third DC / AC inverters arranged in parallel and electrically connected to the DC power supply to convert the DC power generated by the DC power supply into AC power and deliver the AC power to a load, and a control unit for controlling the drive signal from the first DC / AC inverter to the third DC / AC inverter. The capacitance A of the first DC / AC inverter is set to 6 W, the capacitance A of the second DC / AC inverter is set to 3 W, and the capacitance A of the third DC / AC inverter is set to 2 W. Summary of the invention Problems to be solved with the invention

[0008] It has been found that a scheme referred to in patent document 1 described above uses a configuration in which a plurality of electrical power converters are used, each having the same electrical power capacity, and consequently, if a plurality of electrical power converters with different electrical power capacities are used to increase the efficiency of an electrical power conversion device, the application of the scheme is not suitable for this purpose.

[0009] To counter this, the following applies: In order to implement an increased efficiency of an electrical energy conversion device in which a plurality of electrical energy converter units, each having a different electrical power capacity, are connected in parallel, a device is considered that has a function to regulate an electrical energy load distribution ratio of each of the electrical energy converter units. Ways to solve the problems

[0010] The problem underlying the invention is solved by an electrical energy conversion device with the features of independent claim 1. Advantageous embodiments of the electrical energy conversion device according to the invention are specified in dependent claims 2 to 15. Effects of the invention

[0011] An electrical energy conversion device according to the present application comprises the following: a plurality of electrical energy converter units to which a plurality of DC energy sources are connected at their input sides and which are connected in parallel to each other at their output sides;and an electrical power load distribution controller for regulating electrical power in each of the electrical power converter units, wherein, by utilizing an efficiency characteristic (the property that specifies the relationship between electrical power and efficiency) of each of the electrical power converter units, they are arranged such that the adjustment of the electrical power is carried out, with each of the electrical power converter units utilizing among them by means of the electrical power load distribution controller, so that a better efficiency is achieved when the device is considered as a whole, so that, compared with the case in which a ratio per electrical rated power of all electrical power converters is uniformly determined, it becomes possible to make an electrical power conversion efficiency even higher when the device is considered as a whole.

[0012] Furthermore, in order to implement the increased efficiency, the electrical energy conversion device according to the present application can identify a condition in which each of the electrical energy conversion units shares a value of electrical power or the like, by relating the condition by means of hand-operated or manual adjustment or communication, so that an increased efficiency of the electrical energy conversion can be implemented by addressing the requested electrical power from an external device or the like. Brief description of the drawings Fig. Figure 1 is a circuit diagram of an electrical energy conversion device according to embodiment 1 of the present application. Fig. Figure 2 is a diagram illustrating the relationship between the efficiency characteristic of an electrical energy converter unit and its electrical power thresholds according to embodiment 1 of the present application. Fig. Figure 3 is a diagram showing a configuration example of an electrical energy conversion device according to embodiment 1 of the present application. Fig. Figure 4 is a diagram showing a configuration example of the selection process of operating modes according to embodiment 1 of the present application. Fig. Figure 5 is a diagram showing another configuration example of the selection process of operating modes according to embodiment 1 of the present application. Fig. 6A and Fig. Figure 6B are diagrams showing characteristic examples in a three-unit configuration of electrical power converter units with different electrical power ratings, according to embodiment 1 of the present application and embodiment 3 thereof. Fig. 7A and Fig. Figure 7B are diagrams showing characteristic examples in a three-unit configuration of electrical power converter units with the same electrical power ratings, according to embodiment 1 of the present application and embodiment 3 thereof. Fig. Figure 8 is a diagram showing a configuration example of the selection process of operating modes according to embodiment 2 of the present application. Fig. Figure 9 is a diagram showing a configuration example of the selection process of operating modes according to embodiment 3 of the present application. Fig. Figure 10 is a diagram showing an example of hardware for an electrical power load distribution controller according to embodiments 1 to 3 of the present application. Embodiments for carrying out the invention; Embodiment 1

[0013] Fig. Figure 1 is a diagram illustrating an example of a configuration of an electrical energy conversion device according to embodiment 1 of the present application.

[0014] As shown in the drawing, the electrical energy conversion device has an electrical energy load distribution controller 3, to which electrical energy converter units 2 are connected in parallel to each other at their output positions, in order to control each of the electrical energy converter units by responding to the requested electrical power at their parallel output ends (for example, the controller regulates the values ​​of the electrical power that each of the electrical energy converter units shares with each other).

[0015] The electrical energy load distribution controller 3 has a function for obtaining electrical energy information according to a nominal efficiency point, a maximum efficiency point and a permissible efficiency point of the electrical energy converter unit 2, each of which is used for the electrical energy conversion device.

[0016] Regarding the requested electrical power, the following is used: A value entered into the electrical power load distribution controller 3 from an external device, a control calculation result (see the dashed line in the drawing that establishes the connection between the load and the electrical power load distribution controller 3) corresponding to an AC load or flow of electrical power, or any predefined value.

[0017] In the manner described above, the "electrical energy information" essentially assigns a pair (a set) of values ​​for electrical power, where applicable, and, accordingly, a value for the efficiency of an electrical energy converter unit (hereinafter referred to simply as "efficiency"). The electrical energy information is typically information in which each of the electrical energy converter units holds in advance, in its internal memory or the like, two-dimensional numerical data provided by an input specification via a manual operation by an operator or by a communication device.

[0018] As regards a DC energy source 1, an energy source is used that is exemplified by a solar or photovoltaic battery 1a (abbreviated as "PV" in the drawing), a stationary storage battery (e.g., a lithium-ion battery 1b, abbreviated as "LiB" in the drawing), a mobile or vehicle-mounted storage battery (an electric motor vehicle 1c (electric vehicle, abbreviated as "EV" in the drawing) or the like), a fuel cell (not shown in the drawing) or the like; and, with regard to the electrical energy conversion device, different categories of energy sources can be used for this purpose.

[0019] When a DC power source 1 is connected to two or more electrical power converter units 2, the DC power source 1 transmits its category and individual identification information to the electrical power converter units 2 as needed. Furthermore, if circumstances require, the DC power source 1 has a device for monitoring or supervising the power source and transmits information to the electrical power converter unit(s) 2, as needed, regarding the limit of a charging current, the limit of a discharging current, overcharging, over-discharging, and the like, by means of the device for monitoring or supervising the power source.

[0020] Based on information from the energy source monitoring or control device, the electrical energy converter units 2 each set the limit value for the charging or discharging process of their own unit and transmit the modified operating state to the electrical energy load distribution controller 3 as needed. The electrical energy converter units 2 are comprised of – with broad subdivision – a non-disconnecting electrical energy converter unit 2a (a unit shown in the drawing with a single hatched line) and a disconnecting electrical energy converter unit 2b (a unit shown in the drawing with a double hatched line) (the details of which will follow later).

[0021] As regards the electrical energy converter unit 2 of the electrical energy conversion device, the following is used: An electrical energy converter, exemplified by a non-disconnecting type DC / DC converter, a disconnecting type DC / DC converter, a single-phase inverter, a three-phase inverter, or the like; and, as regards the electrical energy converter units 2, a plurality of them can be used, connected in parallel to a DC energy source 1 (hereinafter also referred to as "multiple-parallel").

[0022] With regard to the electrical energy load distribution controller 3, the electrical energy converter units 2 each transmit information including the first electrical power threshold, the second electrical power threshold and the third electrical power threshold, using three types of efficiency from a characteristic curve between electrical power of each of the electrical energy converters and its efficiency, and also obtain electrical energy load distribution instructions from the electrical energy load distribution controller 3.

[0023] Fig. Figure 2 is a diagram illustrating the relationship between the efficiency characteristic or efficiency curve of an electrical power converter unit 2 and its electrical power thresholds. The diagram shows the electrical power values ​​corresponding to the nominal efficiency η. C , the highest efficiency η B and the permissible efficiency η A of the electrical energy converter unit 2 a first electrical power threshold, a second electrical power threshold or a third electrical power threshold.

[0024] The electrical energy load distribution controller 3 regulates or controls such that electrical energy is distributed or shared by each of the electrical energy converter units 2 (which means that it performs the control for load distribution), so that the efficiency of the electrical energy conversion of the electrical energy conversion device is increased by responding to the demanded electrical power.

[0025] A mode for selecting electrical power between the first electrical power threshold and the second electrical power threshold (a load distribution in between is referred to as "Operating State 1", "OS1" in the drawing) or zero is called a first operating mode. A mode for selecting electrical power between the second electrical power threshold and the third electrical power threshold (a load distribution in between is referred to as "Operating State 2", "OS2" in the drawing) or zero is called a second operating mode.

[0026] A mode for selecting electrical power between the third electrical power threshold or less (a state close to this is referred to as "Operating State 3", OS3 in the drawing) or zero is called a third operating mode. The electrical energy conversion device of the embodiment is characterized in that the device has a highly efficient charge-discharge function, including a function for selecting an operating mode from these three types of operating modes.

[0027] It can be assumed that the electrical power load balancing controller 3 preferably selects any one of the DC power sources 1 as an object for electrical charging or electrical discharging, whereas it can be assumed that any one of the DC power sources 1 is removed from a controlled object (a control target) by responding to the requested electrical power. The electrical power load balancing controller 3 manages or supervises a determination for continuing / canceling (go / no-go) the electrical power conversion operations of the electrical power conversion device by obtaining information about a connection state between the DC power sources 1 and the electrical power converter units 2 via the electrical power converter units 2, or by predetermining the connection state.

[0028] The electrical energy load distribution controller 3 determines, by responding to the charging / discharging electrical energy or power demanded by the configuration of the electrical energy conversion device, the shared electrical energy use of each of the electrical energy conversion units 2 in which the efficiency of the electrical energy conversion is good. One form of each of the inputs and that of the parallel outputs in the electrical energy conversion device is not limited to direct current; any one or both of them can also be alternating current.

[0029] It should be noted that information about a connection state, as described above, is particularly necessary when the DC power source 1 described above is a DC power source of a moving body (for example, an electric vehicle or the like). Furthermore, when the electrical power conversion device is considered as a whole, the "determination for continuing / stopping (go / no-go) electrical power conversion processes" means a determination for continuing / stopping (go / no-go) an electrical power conversion process from each of the DC power sources and each of the electrical power converter units.

[0030] Fig. Figure 3 is a diagram illustrating a configuration example of an electrical energy conversion device according to embodiment 1 of the present application. The electrical energy conversion device in the drawing has a total of four DC energy sources 1 of two types and a total of five electrical energy converter units 2 of two types. Among these, one of the DC energy sources 1 is usually connected to two electrical energy converter units 2 of the same type.

[0031] Fig. Figure 4 is a diagram showing an example of the selection sequence of operating modes for a highly efficient charge-discharge function of the electrical energy conversion device, which is formed from the number “N” of electrical energy converter units 2 according to embodiment 1 (hereinafter referred to as a “sequence example F1”). The electrical energy load distribution controller 3 detects a first electrical power threshold to a third electrical power threshold based on identification information obtained from each of the electrical energy converter units 2.

[0032] The operating priority levels of the majority of electrical power converter units 2, which are operated by means of the electrical power load balancing controller 3, are specified in descending order of the first electrical power thresholds. It should be noted that if the aforementioned identification information contains information corresponding to the priority levels, a sequential order of operating priority levels is modified.

[0033] Fig. Figure 5 is a diagram showing an example of a further selection sequence of operating modes for a highly efficient charge-discharge function of the electrical energy conversion device, which is formed from the number “N” of electrical energy converter units 2 according to embodiment 1 (hereinafter referred to as a “sequence example F2”). The electrical energy load distribution controller 3 obtains a first electrical power threshold to a third electrical power threshold from each of the electrical energy converter units.

[0034] The operating priority levels of the majority of electrical energy converter units 2, which are operated under the electrical energy load distribution controller 3, are thereby specified for the electrical energy converter units in the order with the largest of the first electrical power thresholds.

[0035] The following is an explanation for the process example F1, which is in Fig. As shown in Figure 4. First, the symbols used in the drawing are explained. The symbol "P" denotes the electrical power demanded. The symbol "P n (j) denotes a threshold of electrical power, where the symbol “n” is any natural number from 1 to 3. The expression “mode = n” (“n” is any natural number from 1 to 3) denotes an nth operating mode. The symbol “N” denotes the number of converter units. Note that the symbols “i” and “K” are parameters, each with an initial value of 1. It should also be noted that the explanation of the symbols described above is equivalent to or similar to those below in Fig. 5, Fig. 8 and Fig. 9 is.

[0036] The following is a description of the process for selecting an operating mode.

[0037] First: If the requested electrical power does not exceed the third electrical power thresholds of all “N” converter units, a third operating mode (“mode = 3” in the drawing) is selected.

[0038] Secondly: If the required electrical power is not less than the third electrical power threshold of the individual converter units and not more than the second electrical power threshold of the converter units, a second operating mode ("mode = 2" in the drawing) is selected. Thirdly: If the required electrical power is not less than the second electrical power threshold of the number of converter units and not more than the first electrical power threshold of the converter units, a first operating mode ("mode = 1" in the drawing) is selected.Fourthly: If the first to third conditions are not inclusively applicable, and also if the electrical power demanded does not exceed the total sum of the first electrical power thresholds of the converter units capable of performing their electrical power matching, the second operating mode is selected.

[0039] It should be noted that the basic processes of the flowchart example F2, in Fig. 5 shown are equivalent or similar to those of the aforementioned process example F1, and therefore their detailed explanation is omitted.

[0040] In embodiment 1, an electrical energy converter unit 2 is selected by responding to the required electrical power, and for a setting purpose, a majority of electrical energy converter units 2 are selected. The remaining electrical energy converter units 2 are operated with constant charging / discharging electrical energy or power. Here, constant charging / discharging electrical energy is a value of the electrical power of all other converters except the selecting converter. During the first operating mode, the constant charging / discharging electrical energy is an electrical power corresponding to a first electrical power threshold, a second electrical power threshold, or zero.

[0041] During the second operating mode, this is electrical power corresponding to a second electrical power threshold, a third electrical power threshold, or zero. During the third operating mode, this means that the electrical power is zero. Furthermore, the electrical power load balancing controller takes three measures to preferably share a second electrical power threshold that is higher than a first electrical power threshold, thus implementing increased efficiency.

[0042] As a first example, the following procedures are explained in detail below: the electrical energy conversion device is formed from three units of electrical energy converter units 2, each with a different electrical power capacity, namely converter A, converter B and converter C, as shown in Fig. 6A and Fig. 6B shown (they should be referred to as "an electrical power converter unit A, an electrical power converter unit B and an electrical power converter unit C", but instead, for the sake of simplicity, they are referred to as "a converter A, a converter B and a converter C" to avoid a complicated explanation; described in a similar manner below), and the electrical power load sharing controller 3 performs the implementation of electrical power load sharing responsive to the electrical power demand by using the electrical power conversion device, which shares the electrical power in sequential order with respect to the operating priority levels of converter A, converter B and converter C.

[0043] This is Fig. 6A a diagram showing the efficiencies of electrical energy conversion in relation to the electrical power input into each of the individual converters A, B and C; and Fig. Figure 6B is a diagram showing the relationship between the electrical power input and the electrical energy conversion efficiencies when electrical energy load distribution schemes are modified, using the [reference to be added]. Fig. 6A shown converter, and it is the diagram to explain the difference in conversion efficiencies in cases where the electrical energy conversion schemes are modified from a conventional scheme to the schemes implemented in the present application.

[0044] First, the operating conditions are explained. The first electrical power threshold of converter A is set at 200% of the standardized electrical power. A second electrical power threshold is set at 140% of the standardized electrical power. A third electrical power threshold is set at 40% of the standardized electrical power. The first electrical power threshold of converter B is set at 130% of the standardized electrical power. A second electrical power threshold is set at 100% of the standardized electrical power. A third electrical power threshold is set at 30% of the standardized electrical power.

[0045] The first electrical power threshold of converter C is set to 100% of the standardized electrical power. A second electrical power threshold is set to 60% of the standardized electrical power. A third electrical power threshold is set to 40% of the standardized electrical power.

[0046] In the manner described above, “normalized electrical power” means the electrical power when the electrical power supplied to the converter C is at 100% (the same applies below).

[0047] In the electrical energy conversion device, which consists of converters A to C of the same electrical power capacity, the maximum charging / discharging electrical energy of a parallel system is 430% of the normalized electrical power. Therefore, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converters A to C by responding to the electrical power demand according to the charging / discharging of the parallel system, as described below.

[0048] If the electrical power demand is in a range from 430% of the standardized electrical power or less to 390% of it or more (which, for the sake of brevity, is hereafter referred to as "from 430% or less to 390% or more", and the phrase "in a range" is omitted for the sake of complication), converter C is selected as the setting converter, and the electrical power load distribution of converter A and that of converter B (to simplify the explanation, the phrase "electrical power load distribution of it" is omitted, and this also applies hereafter in the explanation) are selected as their first electrical power thresholds.

[0049] If the electrical power demand is in a range from less than 390% of the standardized electrical power to 360% or more thereof (which, for the sake of brevity, is hereinafter referred to as "from 390% or less to 360% or more", and the phrase "in a range" is omitted for the sake of complication), converter C is selected as its second electrical power threshold; converter B is selected as a setting converter; and converter A is selected as its first electrical power threshold.

[0050] If the required electrical power ranges from less than 360% of the standardized electrical power to 300% or more, converter A is selected as the setting converter, and converters B and C are selected at their second electrical power thresholds.

[0051] If the requested electrical power ranges from less than 300% of the standardized electrical power to 240% or more, converter A is selected as a setting converter; converter B is selected at its second electrical power threshold; and converter C is selected with zero output.

[0052] If the requested electrical power ranges from less than 240% of the standardized electrical power to 200% or more, converter A is selected as a setting converter; converter B is selected with zero output; and converter C is selected at its second electrical power threshold.

[0053] If the requested electrical power ranges from less than 200% of the standardized electrical power to 130% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0054] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0055] If the requested electrical power ranges from less than 100% of the standardized electrical power to 60% or more, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0056] If the requested electrical power ranges from less than 60% of the standardized electrical power to 40% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0057] If the requested electrical power ranges from less than 40% of the standardized electrical power to 30% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0058] If the requested electrical power is less than 30% of the normalized electrical power, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0059] In the event that the electrical power for electrical charging or electrical discharging of converter A is limited to 150% of the normalized electrical power as a result of the limitation of the electrical charging or electrical discharging of converter A, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converter A to converter C by responding to the electrical power demanded as a result of a charging-discharging of the system in the manner described below.

[0060] It should be noted that by means of the electrical energy load distribution controller 3, a first electrical power threshold of the converter A is modified from 200% to 150%.

[0061] If the requested electrical power ranges from less than 380% of the standardized electrical power to 340% or more, converter C is selected as a setting converter, and converters A and C are selected at their first electrical power thresholds.

[0062] If the required electrical power ranges from less than 340% of the standardized electrical power to 310% or more, converter A is selected at its first electrical power threshold; converter B is selected as a setting converter; and converter C is selected at its second electrical power threshold.

[0063] If the required electrical power ranges from less than 310% of the standardized electrical power to 300% or more, converter A is selected as the setting converter, and converters B and C are selected at their second electrical power thresholds.

[0064] If the required electrical power ranges from less than 300% of the standardized electrical power to 285% or more, converter A is selected at its second electrical power threshold; converter B is selected at its second electrical power threshold; and converter C is selected as a setting converter.

[0065] If the requested electrical power ranges from less than 285% of the standardized electrical power to 250% or more, converter A is selected at its first electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0066] If the requested electrical power ranges from less than 250% of the standardized electrical power to 240% or more, converter A is selected as a setting converter; converter B is selected at its second electrical power threshold; and converter C is selected with zero output.

[0067] If the requested electrical power ranges from less than 240% of the standardized electrical power to 170% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0068] If the requested electrical power ranges from less than 170% of the standardized electrical power to 150% or more, converter A is selected as a setting converter; converter B is selected at its third electrical power threshold; and converter C is selected with zero output.

[0069] If the requested electrical power ranges from less than 150% of the standardized electrical power to 130% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0070] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0071] If the requested electrical power ranges from less than 100% of the standardized electrical power to 60% or more, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0072] If the requested electrical power ranges from less than 60% of the standardized electrical power to 40% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0073] If the requested electrical power ranges from less than 40% of the standardized electrical power to 30% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0074] If the requested electrical power is less than 30% of the normalized electrical power, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0075] In the event that the electrical power for electrical charging or electrical discharging of converter A is limited to 100% of the normalized electrical power as a result of the limitation of the electrical charging or electrical discharging of converter A, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converter A to converter C by responding to the electrical power demanded as a result of a charging-discharging of the system in the manner described below.

[0076] It should be noted that by means of the electrical energy load distribution controller 3, a first electrical power threshold of the converter A and a second electrical power threshold thereof are both set to 100%.

[0077] If the required electrical power ranges from 330% of the standardized electrical power or less to 290% or more, converter A is selected at its second electrical power threshold; converter B is selected at its first electrical power threshold; and converter C is selected as a setting converter.

[0078] If the required electrical power ranges from less than 290% of the standardized electrical power to 260% or more, converters A and C are selected at their second electrical power thresholds, and converter B is selected as a setting converter.

[0079] If the required electrical power ranges from less than 260% of the standardized electrical power to 240% or more, converters A and B are selected at their second electrical power thresholds, and converter C is selected as a setting converter.

[0080] If the required electrical power ranges from less than 240% of the standardized electrical power to 230% or more, converters A and C are selected at their second electrical power thresholds, and converter B is selected as a setting converter.

[0081] If the requested electrical power ranges from less than 230% of the standardized electrical power to 130% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0082] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0083] If the requested electrical power ranges from less than 100% of the standardized electrical power to 60% or more, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0084] If the requested electrical power ranges from less than 60% of the standardized electrical power to 40% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0085] If the requested electrical power ranges from less than 40% of the standardized electrical power to 30% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0086] If the requested electrical power is less than 30% of the normalized electrical power, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0087] As described above, the following applies: Even when the limitation of the electrical charging or electrical discharging of the electrical energy converter units 2 is applied, the electrical energy load distribution control function or adjustment function is effective by means of the electrical energy load distribution controller 3.

[0088] It should be noted that since the aforementioned limitation of electrical power is a limit that is applied on one side during electrical charging or electrical discharging, it may also be suitable for a form in which the limit is applied with only one of the polarities.

[0089] As a second example, the procedures are described below in which the electrical energy conversion device is formed from the electrical energy converter units 2, each having the same electrical power capacity, namely as three parts consisting of converter A, converter B and converter C, as in Fig. 7A and Fig. 7B shown, and the electrical power load sharing controller 3 performs a process to implement the electrical power load sharing in response to demanded electrical power by using the electrical power conversion device which distributes or shares the electrical power in a priority order with respect to converter A, converter B and converter C.

[0090] This is Fig. 7A a diagram showing the efficiencies of electrical energy conversion in terms of electrical power input to each of the individual converters A, B and C; and Fig. Figure 7B is a diagram showing the relationship between the electrical power rating of the unit and the electrical energy conversion efficiencies when electrical energy load-sharing schemes are modified, using the diagram in Fig. 7A shown converter, and it is the diagram to explain the difference in conversion efficiencies in cases where the electrical energy conversion schemes are modified from a conventional scheme to the schemes implemented in the present application.

[0091] First, the operating conditions are explained. The first electrical power threshold of converter A is set at 100% of the standardized electrical power. A second electrical power threshold is set at 70% of the standardized electrical power. A third electrical power threshold is set at 25% of the standardized electrical power. The first electrical power threshold of converter B is set at 100% of the standardized electrical power. A second electrical power threshold is set at 60% of the standardized electrical power.

[0092] A third electrical power threshold is set at 35% of the standardized electrical power. A first electrical power threshold of converter C is set at 100% of the standardized electrical power. A second electrical power threshold is set at 60% of the standardized electrical power. A third electrical power threshold is set at 40% of the standardized electrical power.

[0093] In the electrical energy conversion device, which consists of converters A to C of the same electrical power capacity, the maximum charge / discharge electrical energy of a parallel system is 300% of the normalized electrical power. Therefore, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converters A to C by responding to the electrical power demand according to the charge / discharge cycle of the parallel system, as described below.

[0094] If the requested electrical power ranges from less than 300% of the standardized electrical power to 260% or more, converter C is selected as a setting converter, and converters A and B are selected at their first electrical power thresholds.

[0095] If the required electrical power ranges from less than 260% of the standardized electrical power to 220% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected at its first electrical power threshold.

[0096] If the required electrical power ranges from less than 220% of the standardized electrical power to 190% or more, converter A is selected as the setting converter, and converters B and C are selected at their second electrical power thresholds.

[0097] If the requested electrical power ranges from less than 190% of the standardized electrical power to 160% or more, converter A is selected at its first electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0098] If the requested electrical power ranges from less than 160% of the standardized electrical power to 130% or more, converter A is selected as a setting converter; converter B is selected at its second electrical power threshold; and converter C is selected with zero output.

[0099] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0100] If the requested electrical power ranges from less than 100% of the standardized electrical power to 70% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0101] If the requested electrical power ranges from less than 70% of the standardized electrical power to 60% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0102] If the requested electrical power is less than 60% of the normalized electrical power, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0103] In Fig. 6B and Fig. 7B states the following: A characteristic curve, when an electrical power load distribution scheme described in JP 5 272 033 B2 is used (more precisely: an average value or mean value of all combinations when parallel operations are carried out by sequentially modifying the combinations of the majority of converters), is designated as a "conventional scheme" for the purpose of comparison with the characteristic curve according to embodiment 1, where there is no limitation of electrical power. It is therefore understood that with embodiment 1 an increased efficiency can be achieved, which is implemented over wide ranges.

[0104] It should be noted that, compared to the characteristic curve when the electrical energy load distribution scheme described in JP 5 272 033 B2 according to the prior art is applied, embodiment 1 has a condition in which the efficiency of the electrical energy conversion is low during parallel operations. However, it is understood that an efficiency of at least 95.5% for the electrical energy conversion can be guaranteed, which corresponds to the third electrical power thresholds of converters A, B, and C.

[0105] In the manner described above, the following applies to the electrical energy conversion device according to embodiment 1: Three elements of the nominal efficiency (corresponding to a first electrical power threshold), the highest efficiency (corresponding to a second electrical power threshold) and a permissible efficiency (corresponding to a third electrical power threshold) receive attention from an efficiency characteristic of each of the electrical energy converters.

[0106] The device comprises the following: a first operating mode in which a load distribution ratio between electrical power corresponding to the highest efficiency and that corresponding to the nominal efficiency and an output from an unwanted electrical energy converter(s) is set to zero; a second operating mode in which a load distribution ratio between electrical power corresponding to the highest efficiency and that corresponding to the permissible efficiency and an output from an unwanted electrical energy converter(s) is set to zero; a third operating mode in which a load distribution ratio is regulated at electrical power corresponding to the permissible efficiency or less, and an output from an unwanted electrical energy converter(s) is set to zero.

[0107] The explanation is given for the device that selects the first operating mode, the second operating mode and the third operating mode by responding to requested electrical power and to values ​​of electrical power corresponding to a first electrical power threshold to third electrical power threshold of each of the electrical power converters, and which implements an increased efficiency as a group of electrical power converters. Design 2

[0108] Fig. Figure 8 is a diagram showing a configuration example of the selection sequence of operating modes according to embodiment 2 of the present application. In the electrical energy conversion device according to embodiment 2, a highly efficient discharge function can be implemented compared to that according to embodiment 1, whereby a second electrical power threshold and a third electrical power threshold become unnecessary. Fig. Figure 8 shows a flowchart for implementing the aforementioned function.

[0109] This means that a second electrical power threshold and a third electrical power threshold of the plurality of electrical energy converter units 2, each operated by the electrical energy load distribution controller 3, are determined by means of the ratios that are defined in advance with respect to a first electrical power threshold, so that a highly efficient charge-discharge function can be implemented, which is further simplified compared to that according to embodiment 1. For example, in Fig. 8 The following is defined: P2 = 0.6P1, and P3 = 0.4P1.

[0110] In embodiment 2, similar to embodiment 1, an electrical energy converter unit 2 is selected by responding to the required electrical power. For adjustment purposes, this selection is made among a majority of electrical energy converter units 2, and the remaining electrical energy converter units 2 are operated with constant charging / discharging electrical energy. During the first operating mode, the value of the constant charging / discharging electrical energy or power is that of a first electrical power threshold, a second electrical power threshold, or zero.

[0111] During the second operating mode, the value represents the electrical power of a second electrical power threshold, a third electrical power threshold, or zero. During the third operating mode, the value represents zero electrical power. Furthermore, the electrical power load balancing controller implements measures to preferably utilize a second electrical power threshold that is higher than a first electrical power threshold, thus achieving increased efficiency. embodiment 3

[0112] Fig. Figure 9 is a diagram showing a configuration example of the selection process of operating modes according to embodiment 3 of the present application.In addition to the configuration according to embodiment 1, the electrical energy conversion device according to embodiment 3 has the following configuration: The configuration is adopted in which a highly efficient charge-discharge function is implemented for improvement by using electrical energy conversion efficiencies corresponding to a first electrical power threshold to a third electrical power threshold, an efficiency characteristic η1 in which an efficiency of the electrical energy conversion corresponding to the first electrical power threshold and a second electrical power threshold is linearly approximated, and an efficiency characteristic η2 in which an efficiency of the electrical energy conversion corresponding to the second electrical power threshold and the third electrical power threshold is linearly approximated.It should be noted that, with regard to the linear approximation of an efficiency characteristic from the third electrical power threshold to zero, the efficiency characteristic η1 is used.

[0113] The efficiency characteristics of the electrical power conversion, which are linearly approximated as described above, are used to implement an increased efficiency greater than that of embodiment 1. The larger the first electrical power threshold, the higher the priority levels for starting the electrical power converter units 2 are specified, and then, if the first electrical power thresholds are equivalent to each other, the higher the efficiency characteristic corresponding to a second electrical power threshold, the higher these levels are specified.

[0114] Regarding the priority levels of the majority of electrical power converter units 2, which are operated by means of the electrical power load balancing controller 3, the following applies: If the electrical power demand is no more than one-third of the electrical power threshold of each of the converter units, a converter unit with the smallest of the first electrical power thresholds is selected; and if the electrical power demand is no less than one-third of the electrical power threshold of each of the converter units, a converter unit with the largest of the first electrical power thresholds is selected, so that a large value of electrical power is preferentially output.

[0115] In embodiment 3, an increased efficiency is implemented that is greater than that of embodiment 1 by using the electrical power load distribution results of the electrical power converter units according to embodiment 1 and by using the aforementioned efficiency characteristics η1 and η2. If only one of the electrical power converter units is not at zero in the electrical power load distribution results according to embodiment 1, one electrical power converter unit is selected so that the required electrical power can be supplied from that one electrical power converter unit by using the efficiency characteristics η1 and η2, and also so that the efficiency of the electrical power conversion is highest at the required electrical power.

[0116] If the electrical load distribution results according to embodiment 1 indicate that a plurality of electrical power converter units are not at zero and also that the electrical load distribution by means of the aforementioned adjusting converter unit of the electrical power converter units is at its second electrical power threshold or higher, an operating condition is selected under which an efficiency prediction level is higher by comparing an efficiency prediction value using the results according to embodiment 1 with an efficiency prediction value when the electrical load distribution by means of the adjusting converter unit of the electrical power converter units is modified to its second electrical power threshold, and when an electrical power converter unit that has the highest priority level is defined as the adjusting unit among the units.where the electrical energy load distribution is zero (the last efficiency prediction value corresponds to an efficiency prediction value according to embodiment 3).

[0117] Furthermore, the following applies: If the electrical power load distribution results according to embodiment 1 indicate that a plurality of electrical power converter units are not at zero, and also that the electrical power load distribution by means of the aforementioned adjusting converter unit of the electrical power converter units is at its second electrical power threshold or less, an operating condition is selected under which an efficiency prediction level is higher by comparing an efficiency prediction value using the results according to embodiment 1 with an efficiency prediction value when the electrical power load distribution by means of the adjusting converter unit of the electrical power converter units is modified to zero, and when an electrical power converter unit that has the lowest priority level is defined as the adjusting unit among the units.where the electrical energy load distribution is at its second electrical power threshold (the latter efficiency prediction value corresponds to an efficiency prediction value according to embodiment 3).

[0118] It should be noted that if the electrical power of an electrical energy converter unit, in which the aforementioned electrical energy load distribution has been modified to zero, cannot be output by means of an electrical energy converter unit that has the lowest priority grade among the units where the electrical energy load distribution is at the second electrical power threshold, it can be assumed that the electrical energy load distribution of an electrical energy converter unit(s) where the electrical energy load distribution is at a second electrical power threshold is specified as a first electrical power threshold, in order of the lower priority grades.

[0119] As a first example, the procedures are described in which the electrical energy conversion device is formed from electrical energy converter units 2, each having a different electrical power capacity, namely in three parts consisting of converter A, converter B and converter C, as in Fig. 6A and Fig. 6B shown, and the electrical power load distribution controller 3 performs electrical power load distribution in response to demanded electrical power by using the electrical power conversion device which distributes or divides the electrical power in a priority order with respect to converter A, converter B and converter C.

[0120] First, the conditions and requirements will be explained.

[0121] The first electrical power threshold of converter A is set at 200% of the standardized electrical power. A second electrical power threshold is set at 140% of the standardized electrical power. A third electrical power threshold is set at 40% of the standardized electrical power. The first electrical power threshold of converter B is set at 130% of the standardized electrical power. A second electrical power threshold is set at 100% of the standardized electrical power. A third electrical power threshold is set at 30% of the standardized electrical power.

[0122] The first electrical power threshold of converter C is set to 100% of the standardized electrical power. A second electrical power threshold is set to 60% of the standardized electrical power. A third electrical power threshold is set to 40% of the standardized electrical power.

[0123] In the electrical energy conversion device, which consists of converters A through C, each with the same electrical power capacity, the maximum charging / discharging electrical energy or power of a parallel system is determined by combining the values ​​of the first electrical power thresholds of converters A, B, and C as a sum (= 200 + 130 + 100), which is 430% of the normalized electrical power. Accordingly, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converters A through C by responding to the electrical power demand resulting from the charging / discharging of the parallel system, as described below.

[0124] If the requested electrical power ranges from less than 430% of the standardized electrical power to 390% or more, converter C is selected as a setting converter, and converters A and B are selected at their first electrical power thresholds.

[0125] If the required electrical power ranges from less than 390% of the standardized electrical power to 360% or more, converter C is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter A is selected at its first electrical power threshold.

[0126] If the required electrical power ranges from less than 360% of the standardized electrical power to 300% or more, converter A is selected as the setting converter, and converters B and C are selected at their second electrical power thresholds.

[0127] If the requested electrical power ranges from less than 300% of the standardized electrical power to 240% or more, converter A is selected as a setting converter; converter B is selected at its second electrical power threshold; and converter C is selected with zero output.

[0128] If the requested electrical power ranges from less than 240% of the standardized electrical power to 200% or more, converter A is selected as a setting converter; converter B is selected with zero output; and converter C is selected at its second electrical power threshold.

[0129] If the requested electrical power ranges from less than 200% of the standardized electrical power to 130% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0130] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0131] If the requested electrical power ranges from less than 100% of the standardized electrical power to 60% or more, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0132] If the requested electrical power ranges from less than 60% of the standardized electrical power to 40% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0133] If the requested electrical power ranges from less than 40% of the standardized electrical power to 30% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0134] If the requested electrical power is less than 30% of the normalized electrical power, converter C is selected as a setting converter, and converters A and B are selected with zero output.

[0135] As a second example, the procedures are described in which the electrical energy conversion device is formed from the electrical energy converter units 2, each having the same electrical power capacity, in three parts consisting of converter A, converter B and converter C, as in Fig. 7A and Fig. 7B shown, and the electrical power load distribution controller 3 performs electrical power load distribution in response to demanded electrical power by using the electrical power conversion device which distributes or divides the electrical power in a priority order with respect to converter A, converter B and converter C.

[0136] First, the operating conditions are explained. The first electrical power threshold of converter A is set at 100% of the standardized electrical power. A second electrical power threshold is set at 70% of the standardized electrical power. A third electrical power threshold is set at 25% of the standardized electrical power. The first electrical power threshold of converter B is set at 100% of the standardized electrical power. A second electrical power threshold is set at 60% of the standardized electrical power. A third electrical power threshold is set at 35% of the standardized electrical power.

[0137] The first electrical power threshold of converter C is set to 100% of the standardized electrical power. A second electrical power threshold is set to 60% of the standardized electrical power. A third electrical power threshold is set to 40% of the standardized electrical power.

[0138] In the electrical energy conversion device, which consists of converters A through C, each with the same electrical power capacity, the maximum charge / discharge electrical energy or power of a parallel system is determined by combining the values ​​of the first electrical power thresholds of converters A, B, and C as a sum (= 100 + 100 + 100), which is 300% of the normalized electrical power. Accordingly, the electrical energy load distribution controller 3 regulates the electrical energy load distribution from converters A through C by responding to the electrical power demand resulting from the charge / discharge of the parallel system, as described below.

[0139] If the requested electrical power ranges from less than 300% of the standardized electrical power to 260% or more, converter C is selected as a setting converter, and converters A and B are selected at their first electrical power thresholds.

[0140] If the required electrical power ranges from less than 260% of the standardized electrical power to 220% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected at its first electrical power threshold.

[0141] If the required electrical power ranges from less than 220% of the standardized electrical power to 190% or more, converter A is selected as the setting converter, and converters B and C are selected at their second electrical power thresholds.

[0142] If the requested electrical power ranges from less than 190% of the standardized electrical power to 160% or more, converter A is selected at its first electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0143] If the requested electrical power ranges from less than 160% of the standardized electrical power to 130% or more, converter A is selected as a setting converter; converter B is selected at its second electrical power threshold; and converter C is selected with zero output.

[0144] If the requested electrical power ranges from less than 130% of the standardized electrical power to 100% or more, converter A is selected at its second electrical power threshold; converter B is selected as a setting converter; and converter C is selected with zero output.

[0145] If the requested electrical power ranges from less than 100% of the standardized electrical power to 70% or more, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0146] If the requested electrical power ranges from less than 70% of the standardized electrical power to 60% or more, converter B is selected as a setting converter, and converters A and C are selected with zero output.

[0147] If the requested electrical power is less than 60% of the normalized electrical power, converter A is selected as a setting converter, and converters B and C are selected with zero output.

[0148] If there is no converter performing a zero output according to the electrical power load distribution results described above, it can be assumed that among the three converters from converter A to converter C, one converter is set to zero output and another converter is set to any of its first electrical power thresholds up to its third electrical power thresholds, while the remaining converter is set as a setting converter, and that an efficiency trial calculation is performed using the efficiency characteristics η1 and η2, and a load distribution result(s) is selected whose efficiency trial value is better by comparing the aforementioned load distribution results.

[0149] If there is only one converter that performs a zero output according to the load distribution results, it can be assumed that one converter is set to a zero output among the remaining two converters, and that the remaining one converter is specified as a setting converter, and that an efficiency test calculation is performed using the efficiency characteristics η1 and η2, and a load distribution result(s) is selected whose efficiency test value is better by comparing the aforementioned load distribution results.

[0150] If there are two converters that perform zero outputs according to the load distribution results, it can be assumed that the remaining converter is set to zero output and that one converter is specified as a setting converter between the remaining two converters that have been set to zero outputs, and that an efficiency test calculation is performed using the efficiency characteristics η1 and η2, and a load distribution result(s) is selected whose efficiency test value is better by comparing the aforementioned load distribution results.

[0151] In Fig. 6B and Fig. 7B is a characteristic curve when an electrical energy load distribution scheme is applied, which is mentioned in JP 5 272 033 B2 according to the prior art, shown as a “conventional scheme” together with the characteristic curve according to embodiment 1, for the purpose of comparison with that according to embodiment 3, where there is no limitation of electrical power.

[0152] Therefore, it goes without saying that in one of the couples according to Fig. 6A and Fig. 6B as well Fig. 7A and Fig. 7B an increased efficiency over all ranges (all ranges of the supplied electrical power of the parallel system) can be implemented in the electrical energy conversion device according to embodiment 3.

[0153] It should be noted that, since an example of the hardware in Fig.As illustrated in Figure 10, the electrical power load distribution controller 3 consists of a processor 100 and a memory device 101. The memory device 101 is equipped with a volatile memory device of selective access memory (RAM) or the like, as well as with a non-volatile auxiliary memory device of flash memory or the like, which are not shown in the drawing. Alternatively, an auxiliary memory device of a hard disk can be provided instead of flash memory.

[0154] Processor 100 executes a program or programs input by memory device 101. In this case, the program(s) are input into Processor 100 from the auxiliary memory device using the volatile memory device. Processor 100 can also output its data, such as a calculated result, to the volatile memory device of memory device 101, or it can store the data in the auxiliary memory device using the volatile memory device.

[0155] Similarly, the electrical power converter unit 2 also contains the processor 100 and the memory device 101 described above, which perform similar operations. It is further understood that – similar to the electrical power load distribution controller 3 – the electrical power converter unit 2 has input / output devices for exchanging information with other devices.

[0156] Furthermore, within the scope of the present application, the respective embodiments can be freely combined, and / or each of the embodiments can be suitably modified or features can be omitted without deviating from the scope of the application. Explanation of reference symbols 1 DC power source 1a DC power source 1b DC power source 1c DC power source 2 Electrical energy converter unit 2a Electrical energy converter unit 2b'' Electrical energy converter unit, 3 electrical power load distribution controllers 100 processor 101 Storage device.

Claims

[1] Electrical energy conversion device comprising: - a plurality of electrical energy converter units (2) connected in parallel, each possessing electrical energy information specifying a relation between a value of electrical power and an efficiency, as well as attribute information of an operating priority level, which is an operating sequence; and - an electrical power load distribution controller (3) for distributing the electrical power to each of the electrical power converter units (2) depending on the power demanded, wherein the electrical power load distribution controller (3) monitors the continuation / termination of electrical power conversion processes of the electrical power converter units (2) taking into account attribute information obtained from each of the electrical power converter units (2), and regulates the electrical power distributed to each of the electrical power converter units (2) by using a first electrical power threshold corresponding to a nominal efficiency of each of the plurality of electrical power converter units (2), a second electrical power threshold corresponding to a maximum efficiency of each of the plurality of electrical power converter units (2), and a third electrical power threshold corresponding to a permissible efficiency,which is an efficiency that becomes a reference efficiency for each of the plurality of electrical energy converter units (2), wherein the electrical power thresholds are information relating to the electrical energy information in the attribute information. [2] Electrical energy conversion device according to claim 1, wherein the attribute information includes information about parallel connection configurations at the input ends of the plurality of electrical power converter units (2) and at their output ends; and wherein the electrical power load distribution controller (3) specifies an operating priority level of each of the electrical power converter units (2) by using the attribute information. [3] Electrical energy conversion device according to claim 2, wherein the electrical energy load balancing controller (3), by responding to the electrical power demand, selects an operating mode from three types of operating modes, namely a first operating mode in which electrical power adjustment of the electrical energy converter units (2) is carried out in a range from the first electrical power threshold to the second electrical power threshold and an output from an unwanted electrical energy converter unit (2) is set to zero, a second operating mode in which electrical power adjustment of the electrical energy converter units (2) is carried out in a range between the second electrical power threshold and the third electrical power threshold and an output from an unwanted electrical energy converter unit (2) is set to zero, and a third operating mode,in which the electrical power matching of the electrical energy converter units (2) is carried out in a range of the third electrical power threshold or less and an output from an unwanted electrical energy converter unit (2) is set to zero, so that the electrical power distributed to each of the electrical energy converter units (2) is controlled by means of the electrical energy load distribution controller (3). [4] Electrical energy conversion device according to claim 2, wherein the operating priority level is specified in descending order from the first electrical power threshold, except in the case where the operating priority level is modified by information relating to a previously given operating priority level. [5] Electrical energy conversion device according to claim 3, wherein the first operating mode ensures that the charging / discharging electrical power of the electrical energy converter units (2), with the exception of the adjusting converter unit of the electrical energy converter units (2), is set to the first electrical power threshold, the second electrical power threshold, or zero when the electrical power demand is not less than the sum of the second electrical power thresholds of two or more of the electrical energy converter units (2), and wherein the charging / discharging electrical power of the electrical energy converter units (2) with the exception of the adjusting converter unit of the electrical energy converter units (2) is set to zero when the electrical power demand is not less than the second electrical power threshold of one of the electrical energy converter units (2); wherein the second operating mode ensures that the charging-discharging electrical power of the electrical energy converter units (2), with the exception of the adjusting converter unit of the electrical energy converter units (2), is set to the second electrical power threshold, the third electrical power thresholds, or zero if there is no case of an electrical energy distribution that satisfies the first operating mode and if the electrical power demand is not less than the sum of the third electrical power thresholds of two or more of the electrical energy converter units (2), and wherein the charging / discharging electrical power of the electrical energy converter units (2), with the exception of the adjusting converter unit of the electrical energy converter units (2), is set to zero when the electrical power demand is not less than the third electrical power threshold of one of the electrical energy converter units (2); and wherein the third operating mode ensures that the charging / discharging electrical power of the electrical energy converter units (2) is set to zero, with the exception of the adjusting converter unit of the electrical energy converter units (2), when there is no case of an electrical energy load distribution that satisfies the first operating mode or the second operating mode. [6] Electrical energy conversion device according to one of claims 2 to 5, wherein the electrical energy load distribution controller (3) generates a first efficiency characteristic by using information about the nominal efficiency, the highest efficiency and the permissible efficiency, wherein the efficiency of an electrical power range between the first electrical power threshold and the second electrical power threshold is linearly approximated by using the nominal efficiency and the highest efficiency, and thereby generates a second efficiency characteristic, wherein the efficiency of an electrical power range between the second electrical power threshold and the third electrical power threshold is linearly approximated by using the highest efficiency and the permissible efficiency. [7] Electrical energy conversion device according to claim 3 or claim 5, wherein the first operating mode ensures that the charging-discharging electrical power of each of the electrical energy converter units (2) is predetermined such that their efficiency is maximized by using the first efficiency characteristic in which the efficiency of an electrical power range between the first electrical power threshold and the second electrical power threshold is linearly approximated by using the nominal efficiency and the highest efficiency when the electrical power demand is not less than a sum of the second electrical power thresholds of at least one or more of the electrical energy converter units (2);wherein the second operating mode ensures that the charging-discharging electrical power of each of the electrical energy converter units (2) is specified such that their efficiency is maximized by using the second efficiency characteristic in which the efficiency of an electrical power range between the second electrical power threshold and the third electrical power threshold is linearly approximated by using the highest efficiency and the allowable efficiency, provided that there is no case of an electrical energy load distribution that satisfies the first operating mode, and provided that the electrical power demand is not less than a sum of the third electrical power thresholds of at least one or more of the electrical energy converter units (2);and wherein the third operating mode ensures that the charging / discharging electrical power of the electrical energy converter units (2), with the exception of the adjusting converter unit of the electrical energy converter units (2), is set to zero when there is no case of an electrical energy load distribution that satisfies the first operating mode or the second operating mode. [8] Electrical energy conversion device according to one of claims 2 to 4, wherein the electrical energy load distribution controller (3) can input the first electrical power threshold and, by using two predefined information parts, a first ratio expressed from zero to one corresponding to the second electrical power threshold and a second ratio expressed from zero to one corresponding to the third electrical power threshold, can refer to the second electrical power threshold in terms of a product of the first electrical power threshold and the first ratio and to the third electrical power threshold in terms of a product of the first electrical power threshold and the second ratio. [9] Electrical energy conversion device according to any one of claims 2 to 6, wherein the electrical energy load distribution controller (3) refers to the first electrical power threshold to the third electrical power threshold if the first electrical power threshold to the third electrical power threshold are predetermined in advance in the electrical energy converter units (2). [10] Electrical energy conversion device according to one of claims 2 to 6, wherein the electrical energy load distribution controller (3) obtains the attribute information when the first electrical power threshold of the plurality of electrical energy converter units (2) up to the third electrical power threshold thereof are predetermined in advance in the electrical energy load distribution controller (3). [11] Electrical energy conversion device according to any one of claims 2 to 6, wherein the electrical energy load distribution controller (3) obtains electrical energy information corresponding to the first electrical power threshold to the third electrical power threshold and determines an operating priority level of each of the electrical energy converter units (2) on the basis of the electrical energy information. [12] Electrical energy conversion device according to any one of claims 2 to 7, wherein the electrical energy load distribution controller (3) obtains attribute information from an electrical energy converter unit (2) and determines an operating priority level of the electrical energy converter unit (2) based on the attribute information. [13] Electrical energy conversion device according to any one of claims 3 to 7, wherein in a configuration in which a DC energy source (1) connected to an electrical energy converter unit (2) has a device for monitoring or supervising the DC energy source (1), wherein it is equipped to obtain, by means of the device for supervising or monitoring the DC power source (1), information on the continuation / cessation of electrical charging, the continuation / cessation of electrical discharging, an upper limit of electrical charging power and an upper limit of electrical discharging power, wherein the electrical energy converter unit (2) performs a limiting of a charging or discharging process according to the information from the device for supervising or monitoring the DC energy source (1); and wherein the electrical energy load distribution controller (3) determines, by responding to the charging / discharging electrical energy or power required by the configuration of the electrical energy conversion device, the electrical energy load distribution of each of the electrical energy conversion units (2) in which the efficiency of the electrical conversion is good. [14] Electrical energy conversion device according to one of claims 3, 5 and 7, wherein in a configuration in which a DC energy source (1) connected to an electrical energy converter unit (2) is an energy source of a movable body, the electrical energy load distribution controller (3) removes the electrical energy converter unit (2) to which the movable body is connected as the target object of the first operating mode to third operating mode, and preferably charges the DC energy source (1). [15] Electrical energy conversion device according to one of claims 2 to 6, wherein, depending on the magnitude of an input voltage and / or an output voltage of the electrical energy converter unit (2), values ​​of the first electrical power threshold to the third electrical power threshold are modified.

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