Provided are an apparatus and method for load-balancing of a three-phase electric power distribution system having a multi-phase feeder, including obtaining topology information of the feeder identifying supply points for customer loads and feeder sections between the supply points, obtaining customer information that includes peak customer load at each of the points between each of the feeder sections, performing a phase balancing analysis, and recommending phase assignment at the customer load supply points.

Discussed are an energy storage device and an energy storage system including the energy storage device. The energy storage device includes at least one battery pack, a power conversion unit to convert, into DC power, AC power from a first phase from among three phases of an internal power network in a charging mode of the energy storage device, and to convert the DC power stored in the at least one battery pack into the AC power in a discharging mode of the energy storage device, a communication module to exchange data with an external energy storage device, and a controller to control the power conversion unit.

Discussed are an energy storage device and an energy storage system including the energy storage device. The energy storage device includes at least one battery pack, a power conversion unit to convert, into DC power, AC power from a first phase from among three phases of an internal power network in a charging mode of the energy storage device, and to convert the DC power stored in the at least one battery pack into the AC power in a discharging mode of the energy storage device, a communication module to exchange data with an external energy storage device, and a controller to control the power conversion unit.

An enclosure and a method for dispersing heat generated by an electrical component within the enclosure is provided and includes associating the electrical component with a conductive via/trace such that the conductive via/trace absorbs the heat generated by the electrical component, wherein the conductive via/trace is constructed from a heat conducting material; directing heat generated by the electrical component away from the electrical component by associating the conductive via/trace with a column having a column wall that defines a column cavity communicated with a column first opening and a column second opening, wherein the column wall is thermally conductive to receive heat flowing into the at least one of the plurality of columns; and allowing an airflow to flow through the column first opening into the column cavity and out of the column second opening, such that the airflow contacts the column wall within the column cavity.

A system and a method for parallel power supply control for auxiliary converters of a motor train unit in the presence of interconnecting lines. The system comprises multiple three-phase inverter modules. The multiple three-phase inverter modules are in parallel connection with each other. Any two-phase circuit of a three-phase inverter module is separately in parallel connection with a corresponding two-phase circuit of a three-phase inverter module adjacent to the three-phase inverter module by using a connecting line module. The connecting line module is connected to a control system. The three-phase inverter modules are also connected to the control system. The three-phase lines of the three-phase inverter modules are all provided with switches. Less interconnecting lines are used, and any two phases of the three-phase inverter modules are separately in parallel connection, and therefore, stable power supply is achieved by balancing currents of any two phases of the three-phase circuits, and the system reliability is improved.

A converter system and inverter system are disclosed with individual real and reactive power control for each phase of a poly-phase system. The converter system includes a controller, bidirectional single-phase inverters with AC sides coupled to an AC line filter and DC sides connected in parallel to a link capacitor coupled to DC/DC converters. Each inverter handles a separate AC phase. The controller controls the inverters and DC/DC converters so the current amplitude of each AC phase is independent, and the phase difference of each AC phase is independent. The inverters can be galvanically isolated between the DC and AC sides. The inverters can be non-isolated inverters having line and neutral connectors coupled to an isolated transformer winding, and the output windings of the transformer can be wired in a Wye configuration. The inverters can have local controllers.

A converter system and inverter system are disclosed with individual real and reactive power control for each phase of a poly-phase system. The converter system includes a controller, bidirectional single-phase inverters with AC sides coupled to an AC line filter and DC sides connected in parallel to a link capacitor coupled to DC/DC converters. Each inverter handles a separate AC phase. The controller controls the inverters and DC/DC converters so the current amplitude of each AC phase is independent, and the phase difference of each AC phase is independent. The inverters can be galvanically isolated between the DC and AC sides. The inverters can be non-isolated inverters having line and neutral connectors coupled to an isolated transformer winding, and the output windings of the transformer can be wired in a Wye configuration. The inverters can have local controllers.

The present invention relates to a solid testing platform and method for function testing of an intelligent phase-change switch. The testing platform includes a primary controller, a first module, a second module, a capacitor C, an intelligent phase-change switch, and a transformer. The primary controller is respectively connected to the first module and the second module, and is configured to control the operation of the first module and the second module. The first module and the second module are connected in parallel to the capacitor C. the first module is configured to feed back excess energy of the capacitor C to a distribution network. The second module is configured to control magnitude and direction of a current that flows through the intelligent phase-change switch. The capacitor C is configured to perform energy support, filtering, and smoothing. According to the present invention, not only all unbalanced operation conditions can be simulated, but also simulated power is equitably fed back to a power grid by using the testing platform, to achieve a test in a state of no power loss, without affecting a main power grid.

The present invention relates to a solid testing platform and method for function testing of an intelligent phase-change switch. The testing platform includes a primary controller, a first module, a second module, a capacitor C, an intelligent phase-change switch, and a transformer. The primary controller is respectively connected to the first module and the second module, and is configured to control the operation of the first module and the second module. The first module and the second module are connected in parallel to the capacitor C. the first module is configured to feed back excess energy of the capacitor C to a distribution network. The second module is configured to control magnitude and direction of a current that flows through the intelligent phase-change switch. The capacitor C is configured to perform energy support, filtering, and smoothing. According to the present invention, not only all unbalanced operation conditions can be simulated, but also simulated power is equitably fed back to a power grid by using the testing platform, to achieve a test in a state of no power loss, without affecting a main power grid.

A load balancing apparatus balances the current supplied on each phase of a multiple phase supply, wherein each supply phase feeds an AC load, as well as an AC-DC converter. The apparatus measures the current supplied from each phase of the supply as well as the power consumed by each of the AC loads. The power consumed by each of the AC-DC converters is adjusted so that the sum of the current drawn by any one of the AC loads, plus the current drawn by the AC-DC converter on the same supply phase, is substantially balanced between the supply phases. Typically, the AC-DC converters supply a common DC bus, such as a battery. In some examples, each AC load includes a DC-AC converter configured to supply power from the common DC battery to one or more of the AC loads.