An apparatus for a system power device utilized in an interconnected power system. The interconnected power system may include multiple system power devices connected to various inter connections of groups of direct currents (DC) from power sources which also may be connected in various series, parallel, series parallel and parallel series combinations for example. The apparatus may include a processor connected to a memory and a communication interface operatively attached to the processor. The communication interface may be adapted to connect to a mobile computing system of a user in close proximity to the system power devices. A graphical user interface (GUI) of the mobile computing system may allow various operational and re-configuration options for the interconnected power system which may include installation, maintenance and monitoring schedules in the interconnected power system when the user of the GUI is in close proximity to the system power devices.

A medium-voltage grid-connected photovoltaic inverter system includes: a photovoltaic inverter, a medium-voltage transformer, a medium-voltage switch, and an inverter grid-connected controller. A direct current input terminal of the photovoltaic inverter is connected to a direct current bus. A low-voltage side of the medium-voltage transformer is connected to an alternating current output terminal of the photovoltaic inverter. An input terminal of the medium-voltage switch is connected to a high-voltage side of the medium-voltage transformer, and an output terminal of the medium-voltage switch is connected to a medium-voltage grid. A voltage sensor is integrated in the medium-voltage switch to detect a line voltage at the high-voltage side of the medium-voltage transformer and a line voltage at a side of the medium-voltage grid and generate a grid-connected voltage detection signal. The inverter grid-connected controller is connected to a controlled terminal of the medium-voltage switch and an output terminal of the voltage sensor.

A microgrid system for water pumps is provided herein and includes a solar array comprising three independent branches and a first pair of photovoltaic modules and a second pair of photovoltaic modules on each of the three independent branches, each of the first pair photovoltaic modules and the second pair of photovoltaic modules connected by a corresponding single-phase inverter connected in series with each other and connected to a common controller configured to connect the first pair photovoltaic modules and the second pair of photovoltaic modules to a grid during a first mode of operation and connect the first pair photovoltaic modules and the second pair of photovoltaic modules to a water pump during a second mode of operation, different from the first mode of operation.

Method and apparatus for generating green electrical power. A modified grid-tie configuration is provided in which electrical power is supplied to a load from a utility grid source and a photovoltaic (PV) source (e.g. solar panels). A grid-tie inverter generates alternating current (AC) power from the PV source that is phase aligned with AC power from the grid. In the event of a grid outage, a specially configured transfer switch disconnects the grid from the PV source and connects the PV source to a backup source. The grid-tie inverter again matches the AC power from the PV source with AC power from the backup source to enable continued operation of the PV source during the grid outage. The backup source may utilize an electrolyzer that generates stored hydrogen and a hydrogen fuel cell that converts the stored hydrogen to electricity.

A solar array power generation system includes a solar array electrically connected to a control system. The solar array has a plurality of solar modules, each module having at least one DC/DC converter for converting the raw panel output to an optimized high voltage, low current output. In a further embodiment, each DC/DC converter requires a signal to enable power output of the solar modules.

A charging system including an accumulator, a use of an MPP tracking method for charging an accumulator, and a method for charging an accumulator with the aid of a charging system, the charging system including a voltage source, a converter, and a rectifier, the current supplied and/or driven by the voltage source being supplied to the DC-voltage-side terminal of a converter, the converter having semiconductor switches, which are controllable in a pulse-width modulated manner, in order to generate an output-side AC voltage, the output-side AC voltage feeding a rectifier, whose output-side voltage, especially rectified voltage, functioning and/or acting as charging voltage for the accumulator, an arrangement for detecting the output current of the inverter being situated in the converter, the effective value of the output current in particular corresponding to the charge current of the converter, a current limiting arrangement of the converter limiting the output current of the inverter to a current value such that the charging power, i.e., the product of charging voltage and charge current, is controlled toward a maximum value.

An energy storage system according to an embodiment of the present disclosure is connected to a grid power source and a photovoltaic panel, and includes: a battery configured to store electric energy received from the grid power source or the photovoltaic panel in a direct current form, or to output the stored electric energy to one or more loads; a grid relay configured to connect or block a power path connected to the grid power source; and a load relay configured to connect or block a power path connected to the load, wherein the grid relay is turned off when an error occurs in the grid power source, and the load relay is turned off when a state of charge of the battery is lower than an off-reference value.

A measurement device that performs a predetermined measurement task together with a plurality of other measurement devices is provided. This measurement device is provided with a sampling phase generator for generating a sampling phase for instructing a timing of sampling, and a communication unit for communicating with at least one of the plurality of other measurement devices. The communication unit transmits the sampling phase generated by the sampling phase generator to at least one of the plurality of other measurement devices. The sampling phase generator is configured to generate a third sampling phase, using an operation that is based on a generated first sampling phase and a second sampling phase received by the communication unit from at least one of the plurality of other measurement devices.

An adaptive solar power battery storage system is disclosed to capture alternative energy for use when desired, regardless of power generating circuit topology (AC or DC). The adaptive solar power battery storage system may be connected directly to solar panel cells (for DC-type solar panels) or to micro-inverters (for AC-type solar panels). The adaptive battery storage system can be configured to accept power from both energy sources simultaneously (AC or DC), or each individually. The adaptive solar power battery storage system may enable the operation of AC-type solar panels in the absence of utility power, which is ordinarily used to supply a reference signal to the micro-inverters, by converting stored DC battery power to AC to generate an emulated reference signal. The system may monitor the utility power and adjust the emulated reference signal to track the utility power to enable a safe transfer back to utility power once restored.

The disclosure relates to an inverter including a first bridge branch with a first phase output, a second bridge branch with a second phase output, a third bridge branch with a third phase output, wherein the phase outputs of the bridge branches can each be connected to a phase conductor of a three-phase power distribution network. The inverter is configured, in a normal operating mode of the three-phase power distribution network and/or of a higher-level power supply network connected thereto, to connect the phase outputs to the relevant phase conductor and, in the event of a fault in the three-phase power distribution network and/or in the higher-level power supply network connected thereto, to disconnect the three-phase power distribution network from the higher-level power supply network via a network disconnector, to disconnect the first phase output from the first phase conductor by means of a switching unit and to connect same to a neutral conductor of the three-phase power distribution network, and to establish a neutral potential for the neutral conductor via the first bridge branch. The disclosure further relates to a method for operating an inverter of this kind.