CN205610317U - Novel minisize power grid - Google Patents

Abstract

The utility model discloses a novel micro-grid, which comprises a wind generator, a solar battery panel, an AC/DC converter, a DC/DC converter, a charging and discharging circuit, a battery pack, a discharging switch, a main power switch, a controller, a first A power supply switch, a second power supply switch, a voltage detector and a power supply line; the output terminal of the voltage detector is connected to the input terminal of the controller, and the four control terminals of the controller are respectively connected to the discharge switch, the main power switch, and the first power supply switch And the control terminal of the second power supply switch is connected. The micro-grid uses wind generators and solar panels to generate power, which can directly supply power to the power supply line, and can also charge the battery through the charging and discharging circuit, so that when the voltage detector detects low voltage, it switches to the battery for power supply. Therefore, the continuous and stable electric energy of the power supply line is maintained, and the structure is not only simple, but also the electric energy is stable and reliable, and has good application prospects.

Description

New Microgrid

technical field

The utility model relates to a power grid, in particular to a micro power grid.

Background technique

At present, the micro grid is generally composed of four parts: renewable energy generation, load, energy storage system and control unit, which can provide various forms of reliable power supply to the load. The power sources in the microgrid are mostly distributed small power sources, such as photovoltaic inverters, wind energy inverters, and energy storage devices. They are generally connected to the user side and have obvious advantages such as low voltage and low pollution. The micro-grid is an effective supplement to the large power grid, avoiding partial power outages caused by a fragile single power supply mode, and greatly improving the flexibility and availability of the system.

In a traditional microgrid, wind energy inverters, photovoltaic inverters, diesel generators, off-grid inverters, and local area network loads are all connected to the AC bus, and the control system controls the working status of each component. The monitoring system will feed back the working status of each unit to the customer. The traditional microgrid has many components, high cost and complex control. Each component unit may come from different manufacturers, which brings great difficulties to the compatibility and maintainability of the system.

Utility model content

Purpose of the utility model: to provide a micro-grid with a simple structure and capable of automatically controlling the power supply mode.

Technical solution: The new micro-grid described in the utility model includes a wind generator, a solar panel, an AC/DC converter, a DC/DC converter, a charging and discharging circuit, a storage battery pack, a discharging switch, a main power switch, and a controller , the first power supply switch, the second power supply switch, a voltage detector and a power supply line; the wind generator is connected to the input end of the AC/DC converter, the solar panel is connected to the input end of the DC/DC converter, and the AC/DC conversion The output end of the converter is respectively connected to the charging end of the charging and discharging circuit and the incoming line end of the first power supply switch, and the output end of the DC/DC converter is respectively connected to the charging end of the charging and discharging circuit and the incoming line end of the second power supply switch; The charging and discharging end of the charging and discharging circuit is connected to the electrode of the battery pack; the discharging end of the charging and discharging circuit is connected to the incoming line end of the discharge switch, and the outgoing line end of the discharging switch is connected to the incoming line end of the main power switch; the outgoing line end of the main power switch Connected to the power supply line, the acquisition end of the voltage detector is connected to the power supply line; the outlet end of the first power supply switch and the outlet end of the second power switch are connected to the inlet end of the main power switch; the output end of the voltage detector is connected to the control The four control terminals of the controller are respectively connected with the control terminals of the discharge switch, the main power switch, the first power supply switch and the second power supply switch.

Wind generator and solar panel are used for power generation, which can directly supply power to the power supply line, and can also charge the battery through the charging and discharging circuit, so that when the voltage detector detects low voltage, it switches to the battery for power supply, so as to maintain the power supply The continuous and stable electric energy of the line is not only simple in structure but also stable and reliable in electric energy; the controller is used to control the closing of the first power supply switch or the second power supply switch, so as to control the wind generator or solar panel to supply power to the power supply line, thereby avoiding two kinds of clean energy The conflicting backflow between them; the discharge switch is used to control the discharge of the battery to avoid the slow discharge of the battery and prolong the service life of the battery; the controller is used to control the main power switch, so that when the power supply of the power supply line is abnormal, the power supply of each load is cut off to ensure that the power grid safety of use.

As a further limiting solution of the present invention, the power supply lines are distributed in a ring, and both ends of the power supply lines are connected to the outlet ends of the main power switch. Adopting the ring distribution can further enhance the reliability of the power supply line.

Compared with the prior art, the utility model has the beneficial effects as follows: (1) the wind power generator and the solar battery panel are used to generate electricity, which can directly supply power to the power supply line, and can also charge the storage battery through the charging and discharging circuit , so that when the voltage detector detects a low voltage, it switches to the battery for power supply, thereby maintaining the continuous and stable electric energy of the power supply line, which is not only simple in structure but also stable and reliable in electric energy; Thereby controlling the wind generator or the solar panel to supply power for the power supply line, thereby avoiding the mutual conflict between the two clean energy sources; (3) using the discharge switch to control the discharge of the battery, avoiding the slow discharge of the battery, and prolonging the service life of the battery; 4) The controller is used to control the main power switch, so that when the power supply of the power supply line is abnormal, the power supply of each load is cut off to ensure the safety of the power grid.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

The technical solution of the utility model will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

Example 1:

As shown in Figure 1, the new micro-grid provided by the utility model includes: wind generators, solar panels, AC/DC converters, DC/DC converters, charge and discharge circuits, battery packs, discharge switches, main power switches, A controller, a first power supply switch, a second power supply switch, a voltage detector and a power supply line.

Wherein, the wind generator is connected to the input end of the AC/DC converter, the solar panel is connected to the input end of the DC/DC converter, and the output end of the AC/DC converter is respectively connected to the charging end of the charging and discharging circuit and the first power supply The input terminals of the switch are connected, and the output terminals of the DC/DC converter are respectively connected with the charging terminal of the charge and discharge circuit and the input terminal of the second power supply switch; the charge and discharge terminals of the charge and discharge circuit are connected with the electrodes of the battery pack; the charge and discharge The discharge end of the circuit is connected to the incoming line end of the discharge switch, the outgoing line end of the discharge switch is connected to the incoming line end of the main power switch; the outgoing line end of the main power switch is connected to the power supply line, and the collection end of the voltage detector is connected to the power supply line; Both the outgoing line end of the first power supply switch and the outgoing line end of the second power supply switch are connected with the incoming line end of the main power switch; the output end of the voltage detector is connected with the input end of the controller, and the four control ends of the controller are connected with the discharge The control terminals of the switch, the main power switch, the first power supply switch and the second power supply switch are connected; the power supply line is distributed in a ring, and both ends of the power supply line are connected to the outlet end of the main power switch.

In the new micro-grid provided by the utility model, the discharge switch, the main power switch, the first power supply switch and the second power supply switch are all controllable electronic switches, and the controller and the voltage detector in the grid are always powered by the storage battery. A single-chip microcomputer can be used, the AC/DC converter and the DC/DC converter are conventional converters, and the charging and discharging circuit is a conventional storage battery charging and discharging circuit.

When the new micro-grid provided by the utility model is working, the load is connected to the circularly distributed power supply line, and the voltage state of the power supply line is monitored in real time by the voltage detector. When the controller controls the first power supply switch to close, the wind power will generate The machine supplies power to the load on the power supply line; when the voltage detector detects that the voltage is insufficient at this time, the controller controls the second power supply switch to close, and at the same time disconnects the first power supply switch. The load supplies power; when the voltage detector detects that the voltage is insufficient at this time, the controller controls the discharge switch to close, and at the same time disconnects the second power supply switch. At this time, the battery supplies power to the load on the power supply line, and the power supply voltage of the battery is slightly lower. At the same time, the controller periodically closes the first power supply switch and the second power supply switch, and the controller controls whether to disconnect the discharge of the battery according to the voltage fluctuation state detected by the voltage detector switch; when the controller receives a relatively large abnormal fluctuation in the voltage on the power supply line collected by the voltage detector, it controls the main power switch to turn off to protect the various components of the power grid.

As stated above, although the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (2)

1. The most new micro electrical network, it is characterised in that: include wind-driven generator, solar panel, AC/DC Changer, DC/DC changer, charge-discharge circuit, accumulator battery, discharge switch, total power switch, control Device, the first power switch, the second power switch, Voltage detector and supply lines；Wind-driven generator and AC/DC The input of changer is connected, and solar panel is connected with the input of DC/DC changer, and AC/DC becomes The outfan of parallel operation is connected with the charging end of charge-discharge circuit and the end of incoming cables of the first power switch respectively, The outfan of DC/DC changer respectively with charging end and the end of incoming cables of the second power switch of charge-discharge circuit It is connected；The charge-discharge end of charge-discharge circuit is connected with the electrode of accumulator battery；The discharge end of charge-discharge circuit with put The end of incoming cables of electric switch is connected, and the leading-out terminal of discharge switch is connected with the end of incoming cables of total power switch；Main power is opened The leading-out terminal closed is connected with supply lines, and the collection terminal of Voltage detector is connected with supply lines；First power switch The leading-out terminal of leading-out terminal and the second power switch is all connected with the end of incoming cables of total power switch；Voltage detector Outfan is connected with the input of controller, and four tunnels of controller control end and open with discharge switch, main power respectively The control end of pass, the first power switch and the second power switch is connected.
2. New micro electrical network the most according to claim 1, it is characterised in that: supply lines is annular spread, The two ends of supply lines are connected to the leading-out terminal of total power switch.