An object of the present invention is to provide a technology capable of accurately controlling according to a predetermined plan, transmitted power when power generated by a power generation system comprised of a solar cell and a storage battery is transmitted between sites via a power transmission network. An electric power control device according to the present invention calculates the power to be charged and discharged by the storage battery, based on the difference between the planned power that was scheduled to be transmitted via the power transmission network and the actual resulting power which was actually transmitted, and calculates the power that the solar cell needs to generate (refer to FIG. 8).

A photovoltaic power generation system includes a protection switch and a plurality of DC-DC converters. Each DC-DC converter includes a direct current bus, a DC-DC circuit, and at least one input interface. The input interface is configured to connect to a photovoltaic unit. The photovoltaic unit includes at least one photovoltaic module. The input interface is connected to the direct current bus by using the protection switch, the direct current bus is connected to an input end of the DC-DC circuit, and an output end of the DC-DC circuit is an output end of the DC-DC converter. The protection switch includes a release device and a switching device that are connected in series. The release device is configured to: when a short-circuit fault occurs on a line in which the release device is located, control the switching device to be disconnected.

A system for balancing and converting voltage output from photovoltaic modules includes a set of solar substrings, a power conversion circuit, and a controller. The power conversion circuit includes: a set of windings coupled in series and arranged in parallel to the set of solar substrings; a set of switches coupled in parallel and interposed between the set of solar substrings and the set of windings; and an output switch coupled in series to a first switch, in the set of switches, and an output capacitor. The controller is configured to: oscillate states of the set of switches and the output switch at a first duty cycle; balance voltages output from the set of solar substrings across the set of windings to a nominal output voltage; and modify the nominal output voltage to a target voltage directed to the target load based on the first duty cycle.

An electronic control device controls an energy converter delivering a total output voltage and/or an output current from a plurality of elementary DC input voltages, each coming from a respective source of energy. The converter has a number of conversion modules, each receiving an elementary DC input voltage from a respective source and delivering an elementary output voltage. The conversion modules are connected in series by the outputs thereof and the total output voltage is equal to the sum of the elementary output voltages. Each conversion module includes a number of switches for converting the elementary DC input voltage into the respective elementary output voltage. The control device has a number of elementary controllers and a main controller connected to the elementary controllers. Each elementary controller is associated with a respective conversion module and controls the switches of the module.

A power management device is provided that includes a voltage converter, a power point tracker for determining an operational voltage for extracting power and a controller. The device has a sensing device configured for: monitoring an energy harvesting signal, comparing the energy harvesting signal with a first threshold value, and based on the values sometimes generating a trigger signal. The controller performs energy harvesting until a trigger signal is generated by cyclically operating the power point tracker for determining a first and second target voltages performing energy harvesting conditionally based on sensing device signals else operating the voltage converter. The sensing device has a signal output of the first trigger signal and the signal output is electrically connected with a signal input of the power point tracker. The power point tracker is configured for starting a determination of the second target voltage when receiving the first trigger signal.

A control method of a tandem solar cell includes: determining a P-V curve of a silicon solar cell by performing scanning for generated electric power while changing a generated voltage of the silicon solar cell at regular intervals; performing power generation control of the silicon solar cell at a maximal power point of a P-V curve; predicting an optimum power generation voltage appropriate for a perovskite solar cell using information regarding a P-V curve of the silicon solar cell; and performing power generation control of the perovskite solar cell using an optimum power generation voltage.

A voltage control device in an output limit situation of a solar power generation facility performs an algorithm to calculate output points adjacent to a limited output (PR) from the current output point of the solar power generation facility. The voltage control device may include a pattern calculation unit for calculating an output pattern comprised of the output points and a voltage adjustment unit for controlling the terminal voltage of the solar panel with the voltage of the final output point of the output pattern.

A transient free switch includes a first input connected to a first alternating current (AC) power source, a second input connected to a second AC power source, and an output connected to a load. A controller manages a transfer of power using at least one relay and at least one solid-state device. When the relay is in a closed state, the first source is connected to the load. Upon determining a request to switch, the controller switches the relay from the closed state to an open state and switches the solid-state device from a disabled state to an enabled state, which connects the second source to the load. This provides an uninterrupted power path during the relay's mechanical transition. After the relay finishes switching to the open state, the controller switches the solid-state device back to the disabled state.

A power supply system includes at least four direct current converters and an inverter. The inverter includes at least two DC/DC circuits. The inverter controls an input end of one DC/DC circuit in the at least two DC/DC circuits to be short-circuited. The at least four direct current converters detect, in response to a case in which the input end of the DC/DC circuit in the at least two DC/DC circuits is short-circuited, whether output operating parameters of the at least four direct current converters meet a preset operating parameter range, and set a number for a direct current converter that is in the at least four direct current converters and whose output operating parameter meets the preset operating parameter range.

The present invention relates to an inverter system (INV) for a photovoltaic system and to a method for operating the inverter system (INV). The inverter system (INV) comprises an inverter unit (WE), ), to which a predetermined number of DC-to-DC converters (B1, . . . , B4) is connected upstream via an intermediate circuit (ZK). The DC inputs (DC1, . . . , DC4) of the inverter system (INV) are formed by the DC-to-DC converters (B1, . . . , B4), which predetermines the number and properties of the DC inputs (DC1, . . . , DC4). The DC inputs (DC1, . . . , DC4) are connected to different direct-voltage units (PV1, PV2, BAT, EC, GE, VB), in particular PV units, energy storage units, etc. A switching unit (SE), which comprises inputs (E1, . . . , E6) for connecting the direct-voltage units (PV1, PV2, BAT, EC, GE, VB), is connected to the DC inputs (DC1, . . . , DC4). The switching unit (SE) is thus arranged between the DC-to-DC converters (B1, . . . , B4) forming the DC inputs (DC1, . . . , DC4) and the direct-voltage units (PV1, PV2, BAT, EC, GE, VB) which are connectable to the switching unit (SE). The different direct-voltage units (PV1, PV2, BAT, EC, GE, VB) connected to the inputs (E1, . . . , E6) are identified (101, 102), and for each direct-voltage unit (PV1, PV2, BAT, EC, GE, VB) connected to an input (E1, . . . , E6) of the switching unit (SE) a current value of at least one power variable is determined (103). The determined current value of the at least one power variable is then compared with at least one predetermined threshold value (104). Depending on a respective comparison result, the switching unit (SE) then establishes a connection between the respectively connected direct-voltage unit (PV1, PV2, BAT, EC, GE, VB) and at least one suitable DC input (DC1, . . . , DC4) and/or adapts the connection (105).