The invention provides a direct-current (DC) microgrid system and an energy management method thereof. A power generation unit comprises a large user-side power grid and a grid-connected alternating current/direct current converter (AC/DC) thereof, a lithium iron phosphate energy storage system (EMS) and an energy storage direct current/direct current converter (DC/DC), and a photovoltaic power generation system and a photovoltaic DC/DC thereof. The DC microgrid system is provided with EMS and a wireless sensor network thereof, wherein the wireless sensor network is communicated with the grid-connected, energy storage and photovoltaic DC/DC; the EMS is used for executing different control strategies and optimizing the operation of a DC microgrid; the voltage of a DC busbar is stabilized by controlling a DC busbar voltage outer loop and an output inductive current inner loop through the grid-connected AC/DC when a grid-connected operation is switched to an islanding operation; and the islanding operation is switched to an operation using the energy storage DC/DC as a voltage source, i.e. the voltage stability of the DC busbar is maintained by controlling the DC busbar voltage outer loop and the inductive current inner loop on the energy storage side of a battery within the time of at most 20ms. Therefore, a seamless switching requirement is met, uninterrupted power supply (UPS) of loads in a telecom data center is realized, and configuration of reactive-load compensation equipment is avoided.

Direct-current microgrid system and energy management method thereof

The invention discloses an inverter which comprises an inverter body, a remote contactor, an inverter output voltage sampler and a power grid voltage sampler The inverter body comprises an inverter power unit and an inverter control unit, the remote contactor is arranged between an output end of the inverter body and a load or a power grid, the inverter output voltage sampler is arranged at the output end of the inverter body, and the power grid voltage sampler is arranged at a power grid end The inverter control unit transmits grid-disconnection or grid-connection instructions to the inverter power unit and is further used for controlling connection or disconnection of the remote contactor between a distributed power generation system and the power grid The inverter has the advantages that an independent operation mode or a grid-connection operation mode can be implemented, the two working modes can be switched over smoothly, the inverter brings convenience for interactively utilizing a distributed renewable energy source and the power grid, impact on the power grid is prevented, and the safety of the power grid is protected

Inverter and method for controlling same

The invention relates to the technical field of power distribution and protection and in particular relates to a DC zonal power distribution system and a power distribution protection method developed based on the power distribution system. The power distribution system comprises a medium-voltage DC bus, a low-voltage DC bus, a DC low-voltage load, an AC low-voltage load, an AC medium-voltage load and a plurality of AC generators; the AC generated by each AC generator is converted into DC by a rectifier for supplying to the medium-voltage DC bus; the medium-voltage DC bus is capable of inverting medium-voltage DC into medium-voltage AC by use of a primary inverter and then supplying the medium-voltage AC to the AC medium-voltage load, and the medium-voltage DC bus is also capable of stepping down the medium-voltage DC into low-voltage DC by use of a primary chopper and supplying the low-voltage DC to the low-voltage DC bus; the low-voltage DC bus is capable of stepping down the low-voltage DC into the voltage needed by the DC low-voltage load by use of a secondary chopper and inverting the low-voltage DC into the voltage needed by the AC low-voltage load by use of a secondary inverter. The power distribution system realizes the conversion, transmission and distribution of electric energy; besides, the engineering application range of the DC power system is expanded.

Power distribution system and power distribution method

The invention discloses an air conditioner, and a power supply system and a power supply method thereof, and relates to the field of air conditioners. The power supply system of the air conditioner comprises a storage battery and a power control unit, wherein the power control unit is used for charging the storage battery through a power grid in the electric energy trough time period of the power grid and controlling the storage battery to supply power to the air conditioner in the electric energy crest time period of the power grid and also controlling the storage battery to supply power to the power grid. By the additional arrangement of energy storage equipment in the power supply system of the air conditioner, energy storage can be executed in the electric energy trough time period, and the stored energy can be supplied to the air conditioner in the electric energy crest time period and also supplied to the power grid reversely, so that the aims of reducing peak and filling trough are fulfilled, and other loads can be considered by taking the air conditioner as a center; due to a self-sufficient small-size power energy center, the air conditioner is not single electric equipment any more and can be used as an energy support to form a power generation, electricity utilization and power storage all-in-one air conditioner.

Air conditioner, and power supply system and power supply method thereof

The present invention relates to a hybrid energy system for charging an electric vehicle and a monitoring device thereof. The hybrid energy system comprises multiple solar arrays, a solar controller, an AC/DC rectifier controller, a battery pack, a DC/DC inverter controller and a DC charging pile, wherein, the solar controller is connected to the multiple solar arrays and is used for converting solar energy into direct current, the AC/DC rectifier controller is connected to the mains supply and is used for converting the alternating current into direct current, the AC/DC rectifier controller, the solar controller and the battery pack provide high voltage direct current to be the input of the DC/DC inverter controller, the DC/DC inverter controller outputs the direct current into the DC charging pile. According to the invention, through the isolation effect of the DC/DC inverter controller, the influence on the state grid is minimized when the DC charging pile or the electric vehicle is failed, the power supply safety of a non-electric vehicle and other important loads is ensured, and the operation safety of the whole system is improved.

Hybrid energy system for charging electric vehicle and monitoring device thereof

The invention relates to a three-wire DC microgrid system suitable for modern buildings and a control method thereof. The three-wire system DC microgrid system comprises a DC three-wire power distribution line, a diesel generator, at least one photovoltaic power generation device with a corresponding DC/DC converter, a group of energy storage batteries, a corresponding DC/DC converter of the batteries, at least one DC/DC converter with a corresponding DC load, at least one DC/AC inverter with a corresponding single-phase industrial frequency AC load, a frequency-amplitude-adjustable DC/AC inverter with a corresponding three-phase AC load, a three-phase AC/DC rectification/inversion device accessed to a large power grid, a voltage balancer and a microgrid control system. By adopting the control method, the microgrid system can run efficiently and steadily for a long term.

Three-wire DC microgrid system suitable for modern buildings and control method thereof.

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Three-wire DC microgrid system suitable for modern buildings and control method thereof.