185 results about "AC module" patented technology

A power converter for converting energy from a green power unit as e.g. a solar cell into energy fed into the commercial grid is described. The object is to provide a versatile modularized power converter with eased access to control of the power switches. Another object is to improve the electrical efficiency. This is achieved by using an independent controller on a DC/DC module and an independent controller on a DC/AC module, whereby the the two independent controllers communicate with each other and the outside world by means of a communication bus. Further, the DC/DC module of the power converter comprises a transformer which transfers energy from the DC/DC module to the DC/AC module. This design enables independent control of the modules and eases controllability of the power switches in order to suppress retroaction from pulsations generated on the mains when supplying energy to a single phase grid. Hereby the electrical efficiency of the power converter is increased. Also, an active snubber circuit is described which further increase the efficiency.

AC module, integrating a solar battery and an inverter, can easily be connected with other plural AC modules in parallel by way of cascade connections. However, when the number of AC modules connected is improvidently increased, the current flowing through the current path or connector of the AC module exceeds a rated current. In view of this, the current detector detects a current in the collective-power current path of the AC module, and when the detected current value exceeds a value set in the reference current setting circuit, the current detector stops the inverter.

A control strategy for distributed power generation modules in a power system that varies the line frequency or voltage according to a predetermined pattern to cause a PV inverter to modify its power output and thereby avoid overcharging a battery. When the power system operates in islanded mode, the AC load demand can be lower than the available energy from the PV array, causing the battery to become overcharged. To avoid this scenario, a hybrid inverter executes a pattern generator algorithm that varies the line frequency or voltage linearly, exponentially or any mathematical function or look-up tables. The PV inverter executes a pattern detection algorithm that detects the linear, exponential, or any mathematical function or look-up table change in the line frequency. In response, the PV inverter modifies its power output until an overcharging condition of the battery is removed. The line frequency/voltage can be varied within the anti-islanding limits to avoid premature disruption of the power system, and no additional settings are required at the device level in order to operate in any mode of operation: islanded, grid-connected or genset-connected.

An AC/DC adapter in which an AC to DC converter is incorporated in a multiple outlet wall adapter. The AC/DC adapter includes at least one standard AC plug receptacle and at least one DC receptacle. Electronic devices which require DC power can be plugged into to the AC/DC adapter by a power cord having a universal DC plug at one end and a connector or plug specific to the make and/or model of the electronic device at the other end. The universal DC plug corresponds with the DC receptacle provided on the AC/DC adapter. The adapter may be formed as one integrated unit or as a modular assembly which includes an AC module and a DC module. In the assembly, the AC and DC modules are constructed so that they can be fitted together and used as one conveniently sized unit, but modules can also be used independently of the other.

The invention provides a power system for an electric vehicle. The power system comprises a power battery, a charging/discharging socket, a three-level bidirectional DC/AC module, a motor control switch, a charging/discharging control module and a controller module, wherein a first direct-current end of the three-level bidirectional DC/AC module is connected with one end of the power battery, and a second direct-current end of the three-level bidirectional DC/AC module is connected with the other end of the power battery; and the controller module is respectively connected with the motor control switch and the charging/discharging control module, and is used for controlling the motor control switch and the charging/discharging control module according to a present working mode of the power system. The power system adopts the three-level control, reduces a DC-DC module, can realize high-power charging, reduces the busbar voltage, and is high in efficiency and short in charging time. The invention further provides an electric vehicle and a motor controller.

A photovoltaic powered system and an alternating current (AC) module thereof are disclosed. The photovoltaic powered system provides a direct current (DC) power through a photovoltaic module and converts the DC power into an AC power, which is grid-connected to an AC utility power. The AC module of the photovoltaic powered system produces a continuous quasi-sinusoidal current and the quasi-sinusoidal current is converted into a sinusoidal current. The high-frequency harmonic components of the sinusoidal current are filtered to produce a sinusoidal output current in phase with the AC utility power, thus realizing the maximum power point tracking (MPPT) of the photovoltaic module and feeding unity-power-factor power into the AC utility power.

A modular air conditioning (AC) system including one or more AC modules is provided. The AC modules may be adapted to function individually or cooperatively as part of a modular system. The AC modules may be further adapted to connect in a variety of advantageous ways to facilitate the supply of conditioned air to a variety of downstream applications.

A photovoltaic (PV) ac-module grounding system includes a plurality of PV dc-voltage modules. Each PV dc-voltage module is integrated with a corresponding dc-ac micro-inverter to provide a corresponding PV ac-voltage module. Each PV ac-voltage module includes an ac-voltage plug and play connector that includes a dc ground conductor. Each dc-ac micro-inverter is internally electrically connected to its own chassis ground or metal enclosure which in turn is electrically connected to a corresponding dc ground conductor. A dc ground path is carried through an ac power bus from ac-voltage module to ac-voltage module through the plug and play connectors via the dc ground conductors.

The invention provides a system of an electric automobile for outwards supplying power. The system comprises a power battery, a charge-discharge socket, a three-level bi-directional DC/AC (Direct Current/ Alternating Current) module, a charge-discharge control module and a controller module, wherein the charge-discharge socket is connected with an externally connected load; one end of the charge-discharge control module is connected with the alternating current end of the three-level bi-directional DC/AC module, and the other end of the charge-discharge control module is connected with the charge-discharge socket; the controller module is used for controlling the three-level bi-directional DC/AC module to convert the voltage of a power battery into the alternating current of a preset voltage value, and providing the alternating current to the externally connected load through the charge-discharge control module and the charge-discharge socket. The system for outward supplying power can outwards supply power through the electric automobile, so that the function of the electric automobile is improved; the three-level bi-directional DC/AC module is adopted, so that the power battery is large power charged and discharged, the efficiency for charging and discharging the power battery is improved, the charging and discharging time is shortened, and convenience is brought for users. The invention also provides the electric automobile.

The present invention provides a power electronic transformer for an alternating current/direct current distribution network. The power electronic transformer for the alternating current/direct current distribution network comprises an input stage, an isolation stage DC-DC converter and an output stage; the input stage is an MMC structure and comprises a plurality of clamping twin sub-modules which are connected in series; the isolation stage DC-DC converter comprises DC/AC modules, high-frequency transformers and AC/DC modules, the number of the DC/AC modules, the high-frequency transformers and the AC/DC modules being the same with the number of the sub-modules of the input stage; the direct current inputs of the isolation stage are connected with the CDSM direct current output ends of the sub-modules, and the isolation stage and the sub-modules share a capacitor; the direct current output ends of the isolation stage are connected in parallel through the sub-modules; and the output stage comprises one or more DC/AC modules so as to be used for supplying power for a low-voltage alternating current load and can also be connected with one or more DC/DC modules so as to be used for supplying power for a low-voltage direct-current load. With the power electronic transformer of the invention adopted, bidirectional flow of power can be realized; electric energy quality can be improved; flexible interfaces are provided; and when a fault occurs at a direct current side, quick self-clearing of the fault can be achieved. The power electronic transformer can be applied to alternating current and direct current hybrid distribution networks containing distributed power supply such as photovoltaic power supply, and various kinds of loads.

The invention discloses a charging type parking space achieving solar power generation. The charging type parking space achieving solar power generation comprises a photovoltaic plate support, a parking place and a charging pile, wherein the photovoltaic plate support is composed of a vertical support and a horizontal support, the parking place is used for parking a vehicle, and the charging pile is arranged in front of the parking place. A plurality of solar panels which are distributed in parallel are arranged on the horizontal support, the charging pile and the vehicle are located under the horizontal support, the charging pile is cylindrical, the top surface of the charging pile is an inclined surface inclined towards the vehicle, a display operation screen facilitating operation by users is arranged on the inclined surface, a socket for charging is arranged on the side face of the charging pile, the charging pile is hollow, and a controller, a storage battery, a DC/AC module and a display driving circuit are arranged inside the charging pile. The charging type parking space achieving solar power generation is simple in structure and low in cost, can not only effectively solve the problem that the electric vehicle is difficult to charge, but also charge the electric vehicle by using solar energy to replace mains electricity, and therefore improves resource use efficiency.

The invention discloses a wireless mutual-charging method and system between electric vehicles. The wireless mutual-charging system comprises a wireless electric energy emitting module, an electric energy reception module, a DC/AC module, an AC/DC module, a vehicle-mounted battery, and a vehicle-mounted charge-discharge controller which are arranged inside the electric vehicle; the vehicle-mounted battery is connected to the wireless electric energy emitting module through the DC/AC module and is connected to the electric energy reception module through the AC/DC module; and the vehicle-mounted charge-discharge controller is connected to the DC/AC module, the AC/DC module and the vehicle-mounted battery. The wireless mutual-charging method and system reduce demand quantity for charging piles, reduces electric loads of a power grid in peak hours and save charging time.

The invention discloses a photovoltaic grid-connected inverter derating control system and method. The system comprises a photovoltaic grid-connected inverter, wherein the photovoltaic grid-connected inverter comprises a DC/DC module and a DC/AC module that are connected with a photovoltaic polar plate; the photovoltaic grid-connected inverter also comprises a DC/AC control unit; the DC/AC control unit comprises a first PID controller, a first limiter, a first power limiter and a second PID controller that are connected in sequence; the reference value of the first PID controller is connected with a bus voltage set value Ubusref; the feedback value of the first PID controller is connected with a bus voltage value Ubus; the first current instruction value Iref1 output by the first PID controller is limited by the first limiter to obtain a second current instruction value Iref2; the second current instruction value Iref2 passes through the first power limiter to obtain a third current instruction value Iref3; the third current instruction value Iref3 is taken as the reference value of the second PID controller; and the current value Iinv output by the DC/AC module is taken as the feedback value of the second PID controller. According to the photovoltaic grid-connected inverter derating control system and method, the system loss is lowered and the system reliability is improved.

The embodiment of the invention provides a photovoltaic solid-state voltage transformer, a photovoltaic inverter system and a bidirectional high-voltage current transformer. The photovoltaic solid-state voltage transformer comprises multiple single-phase modules and filters, wherein each of the single-phase modules comprises multiple multi-output isolation type DC/DC converters and multiple cascaded DC/AC modules; each of the multi-output isolation type DC/DC converters comprises a DC/AC module, a high-frequency voltage transformer, and an AC/DC module; specifically, input ends of the cascadedDC/AC modules are connected with an output end of at least one AC/DC module; output ends of the multiple cascaded DC/AC modules are cascaded; and the multiple single-phase modules and the filters arenetworked via a star connection method or a delta connection method. Therefore, according to the photovoltaic solid-state voltage transformer provided by the embodiment of the invention, the DC/DC converters and the cascaded DC/AC modules are adopted and both are simple logic switches, so the size is reduced; and moreover, the conversion efficiencies of the DC/DC converters and the cascaded DC/ACmodules are higher than 99%, so the working efficiency of the system is higher than 98.5%, and the overall efficiency of the solid-state voltage transformer is improved.

The invention discloses a power factor correction (PFC) power socket, which comprises a PFC AC-DC module and an inversion DC-AC module; the PFC AC-DC module is used for carrying out power factor adjustment on input main supply and converting an input AC power supply into a 350V DC power supply with the power factor being close to 1 by adopting a PFC controller; and the inversion DC-AC module is used for converting the DC power supply into a sine AC power supply with the frequency of 50Hz and the effective voltage of 220V by adopting an inversion technology. The PFC power socket is used for an inductive reactance or capacitive reactance load with lower power factor and has the capability of effectively improving the power factor of the load, thereby reducing the pollution to a power grid caused by the load and improving the energy utilization rate.