A system and method for dynamic phase-load distribution when charging electrical vehicles

Abstract

The invention concerns a 3-phase charging assembly, and a method for providing such assembly, for optimal use of available electrical power when charging electrical vehicles, EV's. The charging assembly comprises a distribution cable supplying power by means of subsidiary isolated conductors for each phase (L1 in, L2 in, L3 in) and a neutral conductor (N in), at least one electric vehicle supply equipment, EVSE, each comprising internal circuitry with an input electrically connected to one or more of the subsidiary isolated conductors (L1 in, L2 in, L3 in) of said distribution cable, and an output (L1 out, L2 out, L3 out) electrically connectible to at least one EV for providing power for charging. Each EVSE comprises a plurality of primary relays (R5, R7, R9) configured to connect or disconnect electrical power provided by the conductors for each phase (L1in, L2 in, L3 in) at the input; a plurality of secondary relays (R6, R8, R10, ..., R16) configured in a relay matrix for enabling re-routing of each of the output conductors (L1 out, L2 out, L3 out) to any phase (L1in, L2 in, L3 in) at the input, and a control system comprising communication means, wherein the control system is configured to connect or disconnect each of said primary and secondary relays (R5...R16) and to transmit and receive relay status information to and from the EVSE.

Description

technical field [0001] The present invention relates to three-phase charging assemblies, and more particularly to systems and methods for optimizing use of available electrical power based on dynamic phase load sharing when charging batteries of electric vehicles. Background technique [0002] In common prior art three-phase charging assemblies for electric vehicles (EVs), the electric vehicle supply equipment (EVSE) supplying power to the output of the charging station is permanently connected to a specific phase such that when more than three EVs Risk of error due to imbalance while charging. Regulations require that, in the absence of arrangements specifically configured to avoid overloading of fuses, the circuit shall allow disconnection of the EVSE from the distribution line when the maximum power available is used. In practice, most electricians at EVSE have to limit the number of charging points corresponding to the number of EVSE units, or limit the maximum charging...

AI Technical Summary

Problems solved by technology

[0006] However, prior art solutions fail to automatically and seamlessly route one-phase loads and three-phase loads through the same three-phase distribution cables for optimal load balancing and use of available power, and where this is based on different Information such as total load on three-phase distribution cables, load on each phase, total power available for charging, power and time required to charge connected EVs, etc.

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