Embodiments of present disclosure relate to apparatus and method for flux management in the ZISC based UPS system. The apparatus comprises: a first determining unit configured to determine a first offset flux on a series reactor in the ZISC based UPS system when power quality events occur in a grid connected to the ZISC based UPS system and the ZISC based UPS system operates in a grid-connected mode; and a first resetting unit configured to provide synthetic impedance damping to the series reactor to reset the first offset flux.

The present disclosure provides an electrical system that includes an energy control system, a photovoltaic (PV) power generation system electrically coupled to the energy control system, an energy storage system electrically coupled to the energy control system, and a smart load panel electrically coupled to the energy control system and to a plurality of backup loads. The energy control system operates in an on-grid mode electrically connecting the PV power generation system to a utility grid and a backup mode electrically disconnecting the PV power generation system from the utility grid. The smart load panel selectively disconnects one or more of the plurality of backup loads from the energy control system when the energy control system is in the on-grid mode and when the energy control system is in the backup mode.

The present disclosure relates to an uninterruptible power supply (UPS) system and, more specifically, to a static transfer switch (STS) that can be applied to a UPS module, the static transfer switch comprising: one semiconductor rectifying element connected to either the anode terminal or the cathode terminal of a direct current power source; a bypass circuit for connecting the input terminal and the output terminal of the semiconductor rectifying element so as to bypass the semiconductor rectifying element; a breaker for opening or closing the bypass circuit; and a switch including a control unit, which controls the semiconductor rectifying element so as to conduct current when a preset conduction signal is received, controls the breaker so as to close the bypass circuit, and, when the bypass circuit is closed by the breaker, controls the semiconductor rectifying element so as to stop the conduction of current.

A power converter system including an input configured to receive input AC power from an input power source, the input power source having a peak voltage limit, at least one output configured to provide output power to at least one load, a charger coupled to the input and configured to convert the input AC power into first DC power, a DC bus configured to receive the first DC power, at least one power converter configured to convert DC power from the DC bus into the output power, and an auxiliary power source coupled to the DC bus and configured to provide second DC power to the DC bus to supplement the first DC power provided by the charger in response to a voltage demand of the at least one load exceeding the peak voltage limit of the input power source.

To provide an apparatus for performing operation relating to switching of a power switch while power is supplied from an auxiliary power source, the apparatus acquires switch information indicating whether the power switch is in an on state from a BMU of a battery pack and determines whether to limit processing based on a user instruction based on the acquired switch information.

A mobile powered workstation can include a head unit assembly that can have at least one power outlet configured to provide power to at least one electronic device. The workstation can include a power system coupled to the head unit assembly. The power system can include a permanent battery and a battery assembly. The battery assembly can include a battery connection housing that can have a plurality of power connectors configured to electrically couple to a corresponding plurality of power connectors of a replaceable battery, the battery connection housing can have a first face and a second face that extends from the first face. The first face can define a first raised portion configured to engage with a corresponding first recessed portion in the replaceable battery. The second face can define a second raised portion configured to engage with a corresponding second recessed portion in the replaceable battery.

An uninterruptible power apparatus with a function of forced disconnection path is coupled between a grid and a load, and the uninterruptible power apparatus includes a bypass path, a power conversion module, a current detection unit, and a control module. The bypass path includes a switch unit, and the power conversion module is connected in parallel to the bypass path. The current detection unit detects a current flowing through the bypass path and transmits a current signal to the control module. The control module provides a turned-off signal to the switch unit when a first voltage of the grid is abnormal, and transmits a polarity of the current signal. The power conversion module generates a compensation amount according to the polarity, and generates an output voltage command according to the compensation amount and a voltage at an input terminal or an output terminal of the power conversion module.

Systems and methods of this disclosure use low voltage energy storage devices to supply power at a medium voltage from an uninterruptible power supply (UPS) to a data center load. The UPS includes a low voltage energy storage device (ultracapacitor/battery), a high frequency (HF) bidirectional DC-DC converter, and a multi-level (ML) inverter. The HF DC-DC converter uses a plurality of HF planar transformers, multiple H-bridge circuits, and gate drivers for driving IGBT devices to generate a medium DC voltage from the ultracapacitor/battery energy storage. The gate drivers are controlled by a zero voltage switching (ZVS) controller, which introduces a phase shift between the voltage on the primary and secondary sides of the transformers. When the primary side leads the secondary side, the ultracapacitor/battery discharges and causes the UPS to supply power to the data center, and when the secondary side leads the primary side, power flows from the grid back to the UPS, thereby recharging the ultracapacitor/battery.

A changeover device for selectively supplying power to at least one load from a grid or a bidirectional inverter includes an input having a grid neutral conductor connection and a grid phase conductor connection for connection to the grid. The changeover device further includes a first output having an inverter neutral conductor connection and an inverter phase conductor connection for connecting the bidirectional inverter, a second output having a load neutral conductor connection and a load phase conductor connection for connecting the load and a switching circuit, the actuator of which is connected to an actuator input of the changeover device. The switching circuit includes a first and a second normally closed contact and a normally open contact that are connected in an interconnection to the grid phase conductor connection, the inverter phase conductor connection, and the load phase conductor connection. An associated method is also disclosed.

Uninterruptible power supplies (UPS) and control methods are disclosed. The UPS can deliver power from a first source, such as AC grid power, under normal operating conditions and a from second source, such as batteries, if power from the first source is unavailable or unsuitable. The UPS can also allocate power to and among various connected loads and can supply supplemental power to a load if that load has surpassed its regular power allocation. For example, when the power output or demand from the loads exceeds the available incoming power from the first power source, supplemental power may be supplied from the second source. Thus, the UPS can support temporary surges in power demand by apportioning power among loads and by temporarily engaging all available power sources, if needed.