Redundant electrical power system for a vehicle

Abstract

An electrical power system. The electrical power system may include a rechargeable energy storage system (RESS) having a high voltage (HV) interface configured to exchange high voltage (HV) power with one or more loads and a low voltage (LV) interface configured to exchange low voltage (LV) power with a plurality of electrical grids; a redundant distribution system has a plurality of busbars configured to redundantly connect an electrical grid with an LV interface such that each of the electrical grids remains operable and connected to the LV interface during a disconnection event.

Description

[0001] introduction The present disclosure relates to electric power systems, such as, but not necessarily limited to, electric power systems operable on a vehicle to redundantly provide electric power to multiple electrical grids.

[0002] The vehicle may include an electric motor for converting electrical power into mechanical power for performing work with the mechanical power, such as mechanically powering a drivetrain to propel the vehicle. Such a vehicle may include a rechargeable energy storage system (RESS) for storing and supplying electrical power, typically connected to the electric motor via a high voltage (HV) interface. Given the relatively large amount of electrical power available from the RESS, it may be desirable to also use the electrical power to power other devices, systems, etc. on the vehicle. The vehicle may include a range of electrical loads that operate at a relatively lower voltage than the electric motor, with some of the vehicles including one or more low voltage (LV) grids, buses, etc., for powering associated LV loads. In the past, such vehicles have included individually operable LV batteries connected to one or more of the LV grids for ensuring electrical power supply to the LV loads in the event that the RESS experiences a disconnection event, or other problems in which the RESS itself and / or its distribution system is unable to reliably supply electrical power to the LV grid. Summary of the invention

[0003] One non-limiting aspect of the present disclosure relates to a vehicle electrical system having a redundant distribution configuration in which electrical power can be reliably provided to a low voltage (LV) grid, bus, etc. during a disconnection event, such as during an event resulting from a bus or other connection being unavailable due to a driving or other incident. The redundant distribution configuration can be advantageous in eliminating or ameliorating the need for a LV battery or other backup system that supplies electrical power to the LV grid independently of a rechargeable energy storage system (RESS).

[0004] One non-limiting aspect of the present disclosure relates to an electric power system for a vehicle having a traction motor and multiple power grids. The system may include a rechargeable energy storage system (RESS) having a HV interface configured to exchange high voltage (HV) power with the traction motor and a LV interface configured to exchange low voltage (LV) power with the power grid. The system may further include a redundant distribution system having a plurality of busbars configured to redundantly connect the power grids to the LV interface such that each of the power grids remains operational and connected to the LV interface during a disconnection event.

[0005] Each grid may include an LV bus configured to distribute LV power to one or more loads, and the busbars may be arranged in a redundant configuration characterized in that each of the LV busses is independently connectable to two or more of the busbars.

[0006] The system may comprise a plurality of aggregation units, each having a plurality of inputs commonly connectable to an output. Each aggregation unit may comprise an output connected to one of the LV buses of the grid and an input individually connected to one of the two or more of the busbars.

[0007] The RESS may include a plurality of cell groups and a plurality of power converters, each of the power converters being operable to convert electrical power from one or more of the cell groups into a plurality of LV outputs, optionally wherein each of the LV outputs respectively delivers LV power to a connected one of the busbars.

[0008] The power grid may include a first power grid and a second power grid, and the aggregation unit may include a first unit and a second unit, such that a cell input of the first unit includes a first primary input and a first secondary input, a cell output of the first unit is connected to the first power grid, a cell input of the second unit includes a second primary input and a second secondary input, and a cell output of the second unit is connected to the second power grid.

[0009] The LV output of each of the power converters may include a first LV output and a second LV output, and the busbar may include a first busbar and a second busbar, such that the first busbar is connected to each of the first LV outputs, and the first primary input and the second primary input, and the second busbar is connected to each of the second LV outputs, and the first secondary input and the second secondary input.

[0010] The LV output of each of the power converters may include a first LV output and a second LV output. The system may further include a junction having a first junction input connectable to the junction output via a first switch or fuse and a second junction input connectable to the junction output via a second switch or fuse. The busbar may include a first busbar, a second busbar, and a third busbar, such that the first busbar is connected to each of the first LV outputs, the first primary input, and the first junction input, the second busbar is connected to each of the second LV outputs, the second secondary input, and the second junction input, and the third busbar is connected to the first secondary input, the second primary input, and the junction output.

[0011] The LV output of each of the power converters may include a first LV output, a second LV output, and a third LV output, and the busbars may include a first busbar, a second busbar, and a third busbar, such that the first busbar is connected to each of the first LV outputs and the first primary input, the second busbar is connected to each of the second LV outputs and the second secondary input, and the third busbar is connected to each of the third LV outputs, the first secondary input, and the second primary input.

[0012] The LV output of each of the power converters may include a first LV output, a second LV output, and a third LV output. The system may further include a junction box having a junction input connected to the first junction output via a first switch or fuse and a second switch or fuse and connected to the second junction output via a first switch or fuse and a third switch or fuse. The busbar may include a first busbar, a second busbar, and a third busbar, such that the first busbar is connected to each of the first LV outputs and the first primary input, the second busbar is connected to each of the second LV outputs and the second secondary input, and the third busbar is connected to each of the third LV outputs, the first secondary input, the second primary input, the junction input, and the first junction output and the second junction output.

[0013] The LV outputs on the primary side of the power converter may each include a first LV output and a second LV output, and the LV outputs on the secondary side of the power converter may each include a third LV output and a fourth LV output. The busbar may include a first busbar, a second busbar, a third busbar, and a fourth busbar, such that the first busbar is connected to each of the first LV outputs and the first primary input, the second busbar is connected to each of the second LV outputs and the first secondary input, the third busbar is connected to each of the third LV outputs and the second secondary input, and the fourth busbar is connected to each of the fourth LV outputs and the first primary input.

[0014] The LV outputs on the primary side of the first plurality of power converters may each include a first LV output, and the LV outputs on the primary side of the second plurality of power converters may each include a second LV output, and the LV outputs on the secondary side of the third plurality of power converters may each include a third LV output, and the LV outputs on the secondary side of the fourth plurality of power converters may each include a fourth LV output. The bus may include a first bus, a second bus, a third bus, and a fourth bus, such that the first bus is connected to each of the first LV outputs and the second secondary input, the second bus is connected to each of the second LV outputs and the second primary input, the third bus is connected to each of the third LV outputs and the first secondary input, and the fourth bus is connected to each of the fourth LV outputs and the first primary input.

[0015] The power grid may include a first power grid and a second power grid, and the aggregation unit may include a first unit and a second unit. The cell input of the first unit may include a first primary input, a first secondary input, and a first tertiary input, wherein the cell output of the first unit is connected to the first power grid. The cell input of the second unit may include a second primary input, a second secondary input, and a second tertiary input, wherein the cell output of the second unit is connected to the second power grid. The LV outputs of the primary side of the power converter may each include a first LV output and a second LV output, and the LV outputs of the secondary side of the power converter may each include a third LV output and a fourth LV output. The bus may include a first bus, a second bus, a third bus, a fourth bus, and a fifth bus, such that the first bus is connected to each of the first LV outputs and the second primary input, the second bus is connected to each of the second LV outputs and the second secondary input, the third bus is connected to each of the third LV outputs and the first secondary input, the fourth bus is connected to each of the fourth LV outputs and the first primary input, and the fifth bus is connected to the first tertiary input and the second tertiary input.

[0016] Each aggregation unit may include a plurality of fuses for connecting one of the LV buses with the two or more of the busbars.

[0017] Each aggregation unit may include a plurality of switches for selectively connecting and disconnecting inputs and outputs.

[0018] Each busbar may have substantially the same length and substantially the same impedance.

[0019] A disconnect event may correspond to one of the bus bars experiencing an open circuit condition.

[0020] A disconnect event may correspond to one of the LV outputs experiencing an open circuit condition.

[0021] One non-limiting aspect of the present disclosure relates to an electric power system for a vehicle having a traction motor and multiple power grids. The system may include a rechargeable energy storage system (RESS), the RESS having a HV interface configured to exchange high voltage (HV) power with the traction motor and a LV interface configured to exchange low voltage (LV) power with the power grid, wherein each power grid includes a LV bus configured to distribute the LV power to one or more loads. The system may further include a redundant distribution system, the redundant distribution system having a plurality of busbars arranged in a redundant configuration, characterized in that each of the LV buses is independently connectable to the LV interface via two or more of the busbars, so that each of the power grids remains operable and connected to the LV interface during a disconnection event in which one of the busbars experiences an open circuit condition.

[0022] The system may comprise a plurality of aggregation units having a plurality of unit inputs commonly connectable to a unit output, optionally wherein each aggregation unit comprises a unit output connected to one of the LV buses of the grid and a unit input individually connected to one of the two or more of the busbars connectable thereto.

[0023] One non-limiting aspect of the present disclosure relates to an electric power system. The system may include a rechargeable energy storage system (RESS), the RESS having a HV interface configured to exchange high voltage (HV) power with one or more loads and a LV interface configured to exchange low voltage (LV) power with multiple power grids. The system may further include a redundant distribution system having a plurality of busbars configured to redundantly connect the power grids to the LV interface, so that each of the power grids remains operational and connected to the LV interface during a disconnection event.

[0024] When considered in conjunction with the accompanying drawings, these features and advantages, together with other features and advantages of the present teachings, can become apparent from the following detailed description of the mode for implementing the present teachings. It should be understood that although the following drawings and embodiments may be described separately, their individual features may be combined into additional embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which may be incorporated in and constitute a part of this specification, illustrate implementations of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] Figure 1 A schematic view of a vehicle according to one non-limiting aspect of the present disclosure is illustrated.

[0027] Figure 2 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0028] Figure 3 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0029] Figure 4 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0030] Figure 5 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0031] Figure 6A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0032] Figure 7 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated.

[0033] Figure 8 A schematic diagram of an electrical power system having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. DETAILED DESCRIPTION

[0034] As desired, detailed embodiments of the present disclosure may be disclosed herein; however, it is understood that the disclosed embodiments may be merely examples of the present disclosure, which may be embodied in various and alternative forms. The drawings may not necessarily be drawn to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, the specific structural and functional details disclosed herein may not need to be interpreted as limiting, but merely as a representative basis for teaching those skilled in the art to adopt the present disclosure in different ways.

[0035] Figure 1 A schematic view of a vehicle 10 according to one non-limiting aspect of the present disclosure is illustrated. The vehicle 10, which may be interchangeably referred to as an electric or hybrid vehicle 10, may include an electric motor 12 operable to convert electric power into mechanical power for performing work, such as mechanically powering a drive system 16 to propel the vehicle. The vehicle 10 is illustrated as a hybrid type because the drive system 16 optionally includes an internal combustion engine (ICE) 18 for generating mechanical power. The drive system 16 may include a transmission, a drive shaft, a differential, an axle, and / or other component parts to facilitate the transfer of rotational force from the electric motor 12 to one or more of the wheels 20, 22, 24, 26. The vehicle 10 may include a rechargeable energy storage system (RESS) 30, which may be referred to as a battery pack 30, for storing and supplying electric power to the electric motor 12 and / or other systems, buses, etc. connected to one or more power grids 34 on the vehicle 10. The vehicle 10 may include a battery monitoring system or controller 32 to facilitate monitoring, controlling, measuring, and otherwise directing operation, performance, etc. on the vehicle 10 .

[0036] Figure 2A schematic diagram of an electric power system 40 having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electric power system 40 may be operable to redundantly provide electric power from the RESS 30 to a power grid 34, which is shown for exemplary purposes as including a first power grid 34A and a second power grid 34B, as more or fewer power grids may be included. The RESS 30 may be of a type having a plurality of battery cells arranged according to a plurality of battery packs 42, wherein each battery pack is associated with a power converter 44. The power converter 44 may be a unidirectional and / or bidirectional direct current (DC) to DC (DC-DC) converter or other type of device operable to manage power transmission. The RESS 30 may include a high voltage (HV) interface 48 and a low voltage (LV) interface 50, wherein the HV interface 48 is operable to exchange HV electric power with the electric motor 12 and / or the HV bus, and the LV interface 50 may be operable via a first connection 52 and a second connection 54 for exchanging LV electric power with the first power grid 34A and the second power grid 34B, respectively. The electrical grids 34A, 34B are described with respect to relying on DC power for non-limiting purposes, as the present disclosure contemplates one or more of the electrical grids utilizing alternating current (AC) power, which may relevantly include one or more of the power converters 44 being DC-AC converters.

[0037] The electric power system 40 may be configured to provide a redundant distribution system having a plurality of busbars 60, 62 configured to redundantly connect the electric grids 34A, 34B to the LV interface 50. The redundant configuration may be operable to maintain operability of the electric grids 34A, 34B during a disconnection event, such as during an event caused by one of the busbars 60, 62 and / or other connections being unavailable due to a driving or other incident. The redundant distribution configuration may be advantageous in eliminating or improving the need for a LV battery or other backup system that supplies electric power to the LV electric grids 34A, 34B independently of the RESS 30 during normal operation, i.e., the electric grids 34A, 34B may be completely dependent on the exchange of electric power with the RESS 30. The vehicle 10 may include a charging module or other features (not shown) to facilitate charging the RESS 30 and / or providing power to the electric grids 34A, 34B from other sources outside the vehicle via a charging station, a utility grid, etc. The present disclosure contemplates RESS 30 including other configurations, including those that do not rely on separate branches for each battery pack 42 and power converter 44 , which may in turn result in different arrangements of busbars 60 , 62 .

[0038] In the illustrated configuration, each of the power converters 44 can be configured to provide a first LV output 64 and a second LV output 66, optionally, wherein the first LV output 64 and the second LV output 66 are substantially the same or different. The busbars can include a first busbar 60 connected to each of the first LV outputs 64 and a second busbar 62 connected to each of the second LV outputs 66. The first power grid 34A can include a first aggregation unit 70 operable to facilitate connecting a first LV bus 72 to the first busbar 60 and the second busbar 62, and the second power grid 34B can similarly include a second aggregation unit 74 operable to facilitate connecting a second LV bus 76 to the first busbar 60 and the second busbar 62. The first aggregation unit 70 can include a first primary input 80 and a first secondary input 82 commonly connected to a first output 84, and the second aggregation unit 74 can similarly include a second primary input 86 and a second secondary input 88 commonly connected to a second output 90. The inputs and outputs 80, 82, 86, 88 are shown as being connectable to the outputs 84, 90 via a plurality of switches (such as semiconductor, transistor, etc. switches) that are operable between open and / or closed positions according to commands received from the controller, however, fuses or other mechanisms may be used to provide selectable and / or fixed connections between the inputs and outputs. As can be appreciated by those skilled in the art, a ground (not labeled) is shown to represent the power converter 44, the grid 34A, 34B, etc., connected to the vehicle ground to facilitate the operations and configurations contemplated herein.

[0039] Figure 3 A schematic diagram of an electrical power system 40A having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40A can be distinguished based on including a third bus 92 and a junction box 94. The power converter 44 can be configured to provide a first LV output 64 and a second LV output 66. The junction box 94 can include a first junction input 96 that can be connected to a junction output 98 via a first switch or fuse, and a second junction input 100 that can be connected to the junction output 98 via a second switch or fuse. The first bus 60 can be connected to each of the first LV output 64, the first primary input 80, and the first junction input 96. The second bus 62 can be connected to each of the second LV output 66, the second secondary input 88, and the second junction input 100. The third bus 92 can be connected to the first secondary input 82, the second primary input 86, and the junction output 98.

[0040] Figure 4A schematic diagram of an electrical power system 40B having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40B can be distinguished based on including a third bus 92 and each of the power converters including a third LV output 102. The power converter 44 can be configured to provide a first LV output 64 and a second LV output 66. The first bus 60 can be connected to each of the first LV outputs 64, and the first primary input 80. The second bus 62 can be connected to each of the second LV outputs 66, and the second secondary input 88. The third bus 92 can be connected to each of the third LV outputs 102, the first secondary input 82, and the second primary input 86.

[0041] Figure 5 A schematic diagram of an electrical power system 40C having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40C can be distinguished based on a third bus 92, a third LV output 102, and a junction box 106 having an input 108 and a first output 110 and a second output 112. The first bus 60 can be connected to each of the first LV outputs 64, and the first primary input 80. The second bus 62 can be connected to each of the second LV outputs 66, and the second secondary input 88. The third bus 92 can be connected to each of the third LV outputs 102, the first secondary input 82, the second primary input 86, the junction input 108, and the first junction output 110 and the second junction output 112.

[0042] Figure 6 A schematic diagram of an electrical power system 40D having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40D may include a first bus 60, a second bus 62, a third bus 92, a fourth bus 114, a fifth bus 116, and aggregation units 70, 74 with additional tertiary inputs 120, 122. The primary side 124 of the power converter 44 may each include a first LV output 64 and a second LV output 66, and the secondary side 126 of the power converter 44 may each include a third LV output 130 and a fourth LV output 132. The first bus 60 may be connected to each of the first LV outputs 64, and the first primary input 80. The second bus 62 may be connected to each of the second LV outputs 66, and the first secondary input 82. The third bus 92 may be connected to each of the third LV outputs 130, and the second tertiary input 122. The fourth bus 114 may be connected to each of the fourth LV outputs 132, and the second secondary input 88. The fifth busbar 116 may be connected to the first tertiary input 120 and the second primary input 86 .

[0043] Figure 7A schematic diagram of an electrical power system 40E having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40E can be distinguished based on including a third bus 92 and a fourth bus 114. The LV outputs of the primary side 124 of the power converter 44 can each include a first LV output 64 and a second LV output 66, and the LV outputs of the secondary side 126 of the power converter 44 can each include a third LV output 130 and a fourth LV output 132. The first bus 60 can be connected to each of the first LV outputs 64, and the first primary input 80. The second bus 62 can be connected to each of the second LV outputs 66, and the second primary input 86. The third bus 92 can be connected to each of the third LV outputs 130, and the second secondary input 88. The fourth bus 114 can be connected to each of the fourth LV outputs 132, and the first secondary input 82.

[0044] Figure 8 A schematic diagram of an electrical power system 40F having a redundant distribution configuration according to one non-limiting aspect of the present disclosure is illustrated. The electrical system 40F can be distinguished based on including a third bus 92 and a fourth bus 114 connected in a different manner. The LV outputs of the primary side 124 of the first plurality of power converters 44 can each include a first LV output 64, and the LV outputs of the primary side 124 of the second plurality of power converters 44 can each include a second LV output 66, and the LV outputs of the secondary side 126 of the third plurality of power converters 44 can each include a third LV output 130, and the LV outputs of the secondary side 126 of the fourth plurality of power converters 44 can each include a fourth LV output 132. The first bus 60 can be connected to each of the first LV outputs 64, and the first primary input 80. The second bus 62 can be connected to each of the second LV outputs 66, and the first secondary input 82. The third bus 92 can be connected to each of the third LV outputs 130, and the second secondary input 88. The fourth busbar 114 may be connected to each of the fourth LV outputs 132, and the second primary input 86. The length, diameter, shape, etc. of the busbars 60, 62, 92, 114 connected to one of the power converters may be varied or sized to adjust the resistance between the power converter 44 and the bus 72, 76 accordingly.

[0045] Although various embodiments have been described, this description is intended to be exemplary rather than restrictive, and it will be apparent to those of ordinary skill in the art that more embodiments and implementations within the scope of the embodiments are possible. Unless otherwise specifically limited, any feature of any embodiment may be used in combination with or replace any other feature or element in any other embodiment. Therefore, the embodiments are not limited except according to the appended claims and their equivalents. In addition, various modifications and changes may be made within the scope of the appended claims. Although several modes for implementing many aspects of this teaching have been described in detail, those skilled in the art who are familiar with the fields to which these teachings are related will recognize various alternative aspects for practicing this teaching within the scope of the appended claims. It is intended that all content contained in the above description or shown in the accompanying drawings should be interpreted as an illustration and example of the entire scope of alternative embodiments, rather than being limited to those embodiments that are explicitly depicted and / or described, and those of ordinary skill will recognize that these alternative embodiments are implied by the included content, are structurally and / or functionally equivalent to the included content, or become apparent based on the included content in other ways.

Claims

1. An electric power system for a vehicle having a traction motor and multiple electrical grids, comprising: a rechargeable energy storage system (RESS) having a high voltage (HV) interface configured for exchanging HV power with a traction motor and a low voltage (LV) interface configured for exchanging LV power with a grid; as well as A redundant distribution system having a plurality of busbars configured to redundantly connect the electrical grids to the LV interface such that each of the electrical grids remains operational and connected to the LV interface during a disconnect event.

2. The electric power system according to claim 1, wherein: Each grid includes a LV bus configured to distribute LV power to one or more loads; and The busbars are arranged in a redundant configuration characterized in that each of the LV busses can be independently connected to two or more of the busbars.

3. The electric power system according to claim 2, further comprising: A plurality of aggregation units, each aggregation unit having a plurality of inputs commonly connectable to an output, wherein each aggregation unit comprises an output connected to one of the LV buses of the grid and an input individually connected to one of the two or more of the busbars.

4. The electric power system according to claim 3, wherein: The RESS includes a plurality of battery cell groups and a plurality of power converters, each of the power converters being operable to convert electrical power from one or more of the battery cell groups into a plurality of LV outputs, each of the LV outputs respectively delivering LV power to a connected one of the busbars.

5. The electric power system according to claim 4, wherein: The power grid includes a first power grid and a second power grid; and The aggregation unit comprises a first unit and a second unit, wherein: The unit input of the first unit includes a first primary input and a first secondary input; A unit output of the first unit is connected to a first grid; The cell input of the second cell includes a second primary input and a second secondary input; and The cell output of the second cell is connected to the second grid.

6. The electric power system according to claim 5, wherein: The LV output of each of the power converters includes a first LV output and a second LV output; and The busbar includes a first busbar and a second busbar, wherein: A first busbar is connected to each of the first LV outputs, and the first primary input and the second primary input; and The second busbar is connected to each of the second LV outputs, and the first secondary input and the second secondary input.

7. The electric power system according to claim 5, further comprising: The LV output of each of the power converters includes a first LV output and a second LV output; a junction box having a first junction input connectable to a junction output via a first switch or fuse and a second junction input connectable to the junction output via a second switch or fuse; and The busbars include the first busbar, the second busbar and the third busbar, wherein: a first busbar connected to each of the first LV output, the first primary input, and the first junction input; a second busbar connected to each of the second LV output, the second secondary input, and the second junction input; and The third busbar is connected to the first secondary input, the second primary input, and the junction output.

8. The electric power system of claim 5, wherein: The LV output of each of the power converters includes a first LV output, a second LV output, and a third LV output; and The busbars include a first busbar, a second busbar and a third busbar, wherein: a first busbar connected to each of the first LV outputs, and to the first primary input; A second busbar is connected to each of the second LV outputs, and the second secondary input; and The third busbar is connected to each of the third LV output, the first secondary input, and the second primary input.

9. The electric power system according to claim 5, further comprising: The LV output of each of the power converters includes a first LV output, a second LV output, and a third LV output; a junction box having a junction input connected to a first junction output via a first switch or fuse and a second switch or fuse and connected to a second junction output via a first switch or fuse and a third switch or fuse; and The busbars include the first busbar, the second busbar and the third busbar, wherein: a first busbar connected to each of the first LV outputs, and to the first primary input; A second busbar is connected to each of the second LV outputs, and the second secondary input; and The third busbar is connected to each of the third LV output, the first secondary input, the second primary input, the junction input, and the first junction output and the second junction output.

10. The electric power system of claim 5, wherein: The LV outputs on the primary side of the power converter each include a first LV output and a second LV output, and the LV outputs on the secondary side of the power converter each include a third LV output and a fourth LV output; and The busbars include a first busbar, a second busbar, a third busbar and a fourth busbar, wherein: a first busbar connected to each of the first LV outputs, and to the first primary input; a second busbar connected to each of the second LV outputs and the first secondary input; A third busbar is connected to each of the third LV outputs, and the second secondary input; and The fourth busbar is connected to each of the fourth LV outputs, and the first primary input.

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