The present disclosure relates to a day-night photovoltaic system. More specifically, power supplied to a solar panel from a DC power supply part is output as a final output power PV together with power produced by the solar panel during the daytime, and is output as the final output power together with an ultra-high frequency wavelength generated by the sun explosion and induced to the solar panel during the night time. This provides the effects of stably supplying the power not only during the daytime but also during the night time.

An inverter energy system supplies power to a site. The inverter energy system comprises a number of solar strings, each solar string including a solar panel(s) as a renewable energy source and an inverter. The inverter energy system is connected to a mains power supply (grid) and to a site load (sub circuits). The forward or reverse power flow into or out of the mains power supply is monitored at a monitoring point at the site. A rate limit is set for power flow into and/or or out of the mains power supply. The supply of power from the inverter energy system is controlled so that the power flow into or out of the mains power supply is within the set rate limit.

A photovoltaic system can include multiple photovoltaic power inverters that convert sunlight to power. An amount of power for each of the inverters can be measured over a period of time. These measurements, along with other data, can be collected. The collected measurements can be used to generate artificial neural networks that predict the output of each inverter based on input parameters. Using these neural networks, the total solar power generation forecast for the photovoltaic system can be predicted.

The present invention relates to resiliency in photovoltaically produced power generation and utilization. This invention comprises a system of elements that combine to minimize the cost and complexity of a backup-capable solar power system. An element of this system is a prior-art balancer-based photovoltaic panel power optimizer whose power electronics are time-shared to allow an array of battery modules to power or provide supplemental or surge power to an inverter. Further elements of the system provide for rapid and low-cost installation, reliability, and easy and safe maintenance.

In a method for operating an inverter for converting DC voltage into AC voltage, having at least one DC/DC step-up converter for converting a DC input voltage applied at the step-up converter DC input into an output voltage higher by a voltage stroke, an intermediate circuit, a DC/AC converter and an AC output for connection to a supply network and/or consumers, a voltage ripple is superimposed on the intermediate circuit voltage and in each step-up converter a switch is switched on/off with a specific switching frequency and a specific duty cycle, for measuring the output voltage of each step-up converter and the intermediate circuit voltage including the voltage ripple. A minimum voltage stroke of each step-up converter is dynamically calculated as a function of the respective measured step-up converter input voltage and the measured intermediate circuit voltage ripple, which minimizes the intermediate circuit voltage setpoint.

Power generation devices and methods for use with toilets is disclosed. A number of power generation devices are provided that can be used in combination to power various features in a toilet which will be particularly useful for portable toilets that are off the grid. The power generation devices and methods include, for example, using a cell battery inside a toilet water source, a wind turbine, solar panels, and piezoelectricity. The features include, for example, lighting up the toilet with light-emitting diodes (LEDs) to make it easier for users to find the toilet, an audio/video setup for entertainment, and a toilet status light indicator to let the next user know when the toilet paper is out.

The present invention pertains to an energy management device 50 of a microgrid S1 which is associated with a power system 1 and is provided with a power storage device 15, the energy management device calculating a target value of received power of the microgrid, the target value optimizing the utilization efficiency of the energy of the microgrid S1, on the basis of power demand prediction in the microgrid S1 by taking, as constraint conditions, the upper and lower limits of the received power of the microgrid S1 and the upper and lower limits of output power of the power storage device.

A photovoltaic system includes an inverter, a controller, and at least two converters. An input terminal of each of the at least two converters are connected to a corresponding photovoltaic module, and output terminals of the at least two converters are connected in series and connected to an input terminal of the inverter. The controller is configured to set a voltage limiting value of at least one of the at least two converters, so that an output voltage of the at least one converter is less than or equal to the voltage limiting value when the converter works in a voltage limiting mode. The voltage limiting value of the at least one converter is proportional to an open circuit voltage of the photovoltaic module connected to an input terminal of the converter. Open circuit voltages of different photovoltaic modules vary with different parameters or models of the photovoltaic modules.

A three-port converter with a wide input range and a control method thereof are provided, which relates to a technical field of power electronic converters. The converter is provided with three ports of a photovoltaic cell PV, a storage battery Bat and a resistance load R, and includes a boost circuit (Boost) and a reversible boost-buck circuit (Sepic-Zeta). The boost circuit is configured to connect the photovoltaic cell PV and the load R; and the reversible boost-buck circuit is configured to connect the photovoltaic cell PV, the storage battery Bat, the storage battery Bat and the load R. The three-port converter of the present disclosure has advantages of a small size, a wide input range, a high integration level, high stability, high conversion efficiency, etc.

The present disclosure relates to a photovoltaic system comprising a switching device for switching on and off at least one photovoltaic string, to an electronically controlled direct current hybrid switching device for switching on and off at least one photovoltaic string, in a user-controlled manner, to the use of a hybrid switch for switching a photovoltaic string, and to a method for switching off and back on at least one photovoltaic string of the photovoltaic system. The photovoltaic system comprises: at least one photovoltaic string, wherein the at least one photovoltaic string is formed by photovoltaic modules which are series-connected by means of a string line and thus generate a string voltage; a switching device which is installed in series in the string line to switch on and off the at least one photovoltaic string with the switching device, wherein the switching device comprises a hybrid switch with a relay and a semiconductor switching device which is connected in parallel to the relay and has at least one semiconductor switch.