CN204578107U - A kind of multi-functional combining inverter - Google Patents

Abstract

The utility model proposes a multifunctional grid-connected inverter, including a grid-connected inverter connected to the public grid through wires, and an automatic reclosing device is connected in series between the output end of the grid-connected inverter and the public grid , can automatically perform reclosing operations, or receive remote control instructions through wired or wireless methods, and perform opening or closing operations. In order to measure the output current and output electric energy, according to the size of the output current, the electric energy meter is connected in series between the output end of the grid-connected inverter and the input end of the automatic reclosing device or connected in parallel through the current transformer. The utility model has the function of under-voltage or loss-of-voltage protection, and can cooperate with the automatic reclosing device to realize automatic reclosing operation, and can receive remote control instructions through wired or wireless methods, and perform opening or closing operations; Metering the output current and output power of the grid-connected inverter saves installation space, reduces system cost, and enhances practicability and economy at the same time.

Description

A multifunctional grid-connected inverter

technical field

The utility model relates to a multifunctional grid-connected inverter, which is applied in the fields of new energy, photovoltaic, wind power and other grid-connected power generation.

Background technique

At present, the output terminals of the known grid-connected inverters are generally connected to the power grid through an isolating switch, and do not have an under-voltage or loss-of-voltage protection function, which brings great hidden dangers to the safety of the power grid. None of the known grid-connected inverters is equipped with an electric energy meter, which brings difficulties to the measurement of electric energy. In order to measure electric energy, a metering cabinet is required, which causes an additional economic burden to the user, and the metering cabinet occupies the installation space. When the project installation space is limited, it brings great inconvenience to project design and construction.

Contents of the invention

In order to overcome the shortcomings of existing grid-connected inverters that cannot be under-voltage or voltage-loss protection, and do not have metering functions, the utility model provides a multi-functional grid-connected inverter, which not only has the function of voltage-loss protection, Moreover, it can automatically reclose after the line is restored to power, or receive remote commands to perform opening and closing operations, and can also measure the output power of the inverter, saving space and project costs.

The technical scheme that the utility model solves its technical problem adopts is:

A multifunctional grid-connected inverter, including a grid-connected inverter connected to the public grid through wires, an automatic reclosing device is connected in series between the output end of the grid-connected inverter and the public grid, which can automatically perform Reclosing operation, or receive remote control instructions through wired or wireless, and perform opening or closing operations.

The grid-connected inverter and the automatic reclosing device are arranged in the cabinet.

An electric energy meter is connected in series between the output end of the grid-connected inverter and the input end of the automatic reclosing device.

The wires between the output end of the grid-connected inverter and the input end of the automatic reclosing device are respectively provided with a first current transformer, a second current transformer and a third current transformer, and the first current transformer An electric energy meter is connected in series between the output terminals of the transformer, the second current transformer and the third current transformer and the input terminal of the automatic reclosing device.

The grid-connected inverter, automatic reclosing device and electric energy meter are arranged in the cabinet.

The automatic reclosing device includes a circuit breaker with undervoltage tripping function, an electric operating mechanism for controlling the circuit breaker to be in the opening or closing state, and a control module capable of receiving remote control commands and controlling the electric operating mechanism , the terminal of the control module is connected to the incoming line end of the wire to detect the voltage signal at the incoming line end, and the control module receives commands from the remote client through wired or wireless means.

The control module is provided with a contactor or relay contact for controlling the closing of the electric operating mechanism and a contactor or relay contact for controlling the opening of the electric operating mechanism. control coils for relay or relay contacts.

The model of the control module is PIC24FJ128GA106, which has a built-in GPRS module, a WIFI module, a Bluetooth module or a combination of one or more of the ZIGBEE modules, and a built-in RS232 or RS485 interface.

The incoming terminal of the three-phase conductors is connected in parallel with a power indicator light indicating whether the circuit is powered, and the outgoing terminal of the three-phase conductor is connected in parallel with a load indicator indicating whether the circuit is powered and whether the switching is successful.

The control module is connected with a power indicator light indicating whether the circuit has power, and a load indicator light indicating whether the circuit has power and whether the closing is successful.

Compared with the prior art, the multifunctional grid-connected inverter of the present utility model has the following beneficial effects:

The utility model has the function of under-voltage or loss-of-voltage protection, and can cooperate with the automatic reclosing device to realize automatic reclosing operation, and can accept remote control instructions through wired or wireless methods, and perform opening or closing operations; it can also be measured The output current and output power of the grid-connected inverter save installation space, reduce system cost, and enhance practicability and economy at the same time.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the principle of the first embodiment of the utility model;

Accompanying drawing 2 is the schematic diagram of the principle of the second embodiment of the utility model;

Accompanying drawing 3 is the schematic diagram of the principle of the third embodiment of the present utility model;

Accompanying drawing 4 is the schematic diagram of the principle of the automatic reclosing device in Fig. 1-3;

Figures 5-8 are schematic diagrams of four structures of automatic reclosing devices in a three-phase power grid.

In the figure, 1. Grid-connected inverter, 2. Automatic reclosing device, 3. Energy meter, 4. First current transformer, 5. Second current transformer, 6. Third current transformer, 7. Cabinet , a, circuit breaker, b, electric

c, the indicator light of the power supply, d, the indicator light of the load, e, the contactor or relay contact, control the circuit breaker electric operating mechanism b closing, f, the contactor or relay contact, control the circuit breaker The electrical operating mechanism b of the device is opened, g, the control module, h, the control coil of the contactor or relay contact e, i, the control coil of the contactor or relay contact f.

Detailed ways

A specific embodiment of a multifunctional grid-connected inverter of the present invention will be described in detail below in conjunction with accompanying drawings 1-8.

Embodiment one:

As shown in FIG. 1 , the output of the grid-connected inverter 1 is connected to the input end of the automatic reclosing device 2 , and the output end of the automatic reclosing device 2 is connected to the public power grid. The automatic reclosing device 2 can automatically perform the reclosing operation, and can also receive remote commands to perform closing or opening operations through wired or wireless means.

Embodiment two:

As shown in Figure 2, the output current of the grid-connected inverter 1 of the present utility model is small, and the output current can be directly measured by the electric energy meter 3. In the cabinet 7, the AC output of the grid-connected inverter 1 is connected to the input terminal of the automatic reclosing device 2 after passing through the electric energy meter 3, and the output terminal of the automatic reclosing device 2 is connected to the public power grid, and the grid voltage signal is connected to the electric energy meter 3 . The acquisition of the grid voltage signal can be connected to the input end of the automatic reclosing device 2 or the output end of the automatic reclosing device 2 . The automatic reclosing device 2 can automatically perform the reclosing operation, and can also receive remote instructions via wired or wireless means to perform closing or opening operations.

Embodiment three:

As shown in Figure 3, the output current of the grid-connected inverter 1 of the present utility model is relatively large, and the output current cannot be directly measured by the electric energy meter 3 and needs to be measured by installing a current transformer. All components of the utility model are packaged in the multifunctional grid-connected inverter cabinet 7, and the AC output of the grid-connected inverter 1 passes through the first current transformer 4, the second current transformer 5 and the third current transformer connected to the input end of the automatic reclosing device 2 after the device 6, the output end of the automatic reclosing device 2 is connected to the public power grid, and the output terminals of the first current transformer 4, the second current transformer 5 and the third current transformer 6 are connected into the electric energy meter 3, and the grid voltage signal is connected to the electric energy meter 3. The acquisition of the grid voltage signal can be connected to the input end of the automatic reclosing device 2 or the output end of the automatic reclosing device 2 . The automatic reclosing device 2 can automatically perform the reclosing operation, and can also receive remote commands to perform closing or opening operations through wired or wireless means.

As shown in accompanying drawing 4, the structure of automatic reclosing device in above-mentioned embodiment one to three is as follows:

The power indicator light c indicates the presence or absence of AC three-phase power, the load indicator light d indicates whether the load end is powered; when the incoming line terminal loses power or undervoltage, the circuit breaker a trips for protection, and the power indicator light c is off, the indicator light d of the load has power is off; when the circuit is powered on again, the indicator light c of the power supply is on, the indicator light d of the load power is off, the control module g detects that there is power, and the contactor or relay contact f is automatically controlled The control coil i of the contactor or relay e is energized, the contactor or relay contact f is closed, and the electric operating mechanism b executes the opening operation to reset the circuit breaker a. Then, the control module automatically controls the control coil h of the contactor or relay e to be energized, and contacts The circuit breaker or relay contact e is closed, the electric operating mechanism b performs the closing operation, and the circuit breaker a is closed, the load has power indicator d lights up, and the automatic power recovery and reclosing operation is completed, or the control module g receives the closing operation of the remote client After the brake command, the control coil i that controls the contactor or relay contact f is energized, the contactor or relay contact f is closed, the electric operating mechanism b performs the opening operation, and the circuit breaker a is reset. Then, the control module g controls the contactor The control coil h of the circuit breaker or relay e is energized, the contactor or relay contact e is closed, the electric operating mechanism b performs the closing operation, and the circuit breaker a is closed, the indicator light d of the load with power is on, and the power recovery and reclosing operation is completed . Contactor or relay contact f and contactor or relay contact e are instantaneous type, and their states are not maintained.

After the control module g receives the opening command from the remote client through wired or wireless means, the control module g controls the control coil i of the contactor or relay contact f to be energized, the contactor or relay contact f is closed, and the electric operating mechanism b executes Opening operation, load energized indicator light d goes out; after control module g receives the closing command from the remote client through wired or wireless means, the control coil h that controls the contactor or relay contact e is energized, and the contactor or relay contacts The point e is closed, the electric operating mechanism b executes the closing operation, and the load indicator light d is on. Contactor or relay contact f and contactor or relay contact e are instantaneous type, and their states are not maintained.

As shown in Figure 5-8, the terminal of the control module g is connected to the incoming line of the AC circuit. The model of the control module g is PIC24FJ128GA106, and its built-in modules are respectively equipped with GPRS module, WIFI module, Bluetooth module and ZIGBEE module Any one or a combination of several can realize wireless transmission, and the built-in RS232 or RS485 interface can realize wired transmission.

The multifunctional grid-connected inverter of the utility model is simple and convenient to install and operate, as shown in the accompanying drawings.

Claims (10)

1. a multi-functional combining inverter, comprise the combining inverter (1) be connected with public electric wire net by wire, it is characterized in that: between the output (INV1, INV2, INV3) of described combining inverter (1) and public electric wire net, be in series with auto recloser (2), auto recloser (2) can automatically perform reclosing operation or receive remote control commands by wired or wireless mode, and performs separating brake or closing operation.

2. the multi-functional combining inverter of one according to claim 1, is characterized in that: described combining inverter (1) and auto recloser (2) are arranged in rack (7).

3. the multi-functional combining inverter of one according to claim 1, is characterized in that: be in series with electric energy meter (3) between the output (INV1, INV2, INV3) of described combining inverter (1) and the input (IN1, IN2, IN3) of auto recloser (2).

4. the multi-functional combining inverter of one according to claim 1, it is characterized in that: the output (INV1 of described combining inverter (1), INV2, and the input (IN1 of auto recloser (2) INV3), IN2, IN3) wire between is respectively arranged with the first current transformer (4), second current transformer (5) and the 3rd current transformer (6), described first current transformer (4), the output of the second current transformer (5) and the 3rd current transformer (6) and the input (IN1 of auto recloser (2), IN2, IN3) electric energy meter (3) is in series with between.

5. the multi-functional combining inverter of the one according to claim 3 or 4, is characterized in that: described combining inverter (1), auto recloser (2) and electric energy meter (3) are arranged in rack (7).

6. according to claim 1, the multi-functional combining inverter of one described in 3 or 4, it is characterized in that: described auto recloser comprises the circuit breaker (a) of a band undervoltage tripping function, a motor-operating mechanism (b) being in separating brake or "on" position in order to control circuit breaker (a), one can receive remote control commands and control the control module (g) of motor-operating mechanism (b), the terminals of described control module (g) are connected to the end of incoming cables of wire in order to detect the voltage signal of end of incoming cables, control module (g) receives Terminal Server Client instruction by wired or wireless mode.

7. the multi-functional combining inverter of one according to claim 6, it is characterized in that: described control module (g) is provided with the contactor or the relay contact (f) that control motor-operating mechanism (b) contactor that closes a floodgate or relay contact (e) and control motor-operating mechanism (b) separating brake, in control module (g)

There is the control coil of the control coil (h) of contactor or relay contact (e) and contactor or relay contact (f) (i).

8. the multi-functional combining inverter of one according to claim 6, it is characterized in that: the model of described control module (g) is PIC24FJ128GA106, it is built-in with wherein one or more the combination in GPRS module, WIFI module, bluetooth module or ZIGBEE module, built-in RS232 or RS485 interface.

9. the multi-functional combining inverter of one according to claim 1,3 or 4, it is characterized in that: whether the end of incoming cables of described wire is parallel with instruction circuit has the power supply of electricity to have electric indicator light (c), whether the leading-out terminal of wire is parallel with instruction circuit has electricity and the whether successful load of combined floodgate to have electric indicator light (d).

10. whether whether the multi-functional combining inverter of one according to claim 1,3 or 4, is characterized in that: described control module (g) is connected with and indicates circuit to have the power supply of electricity to have electric indicator light (c) and instruction circuit to have electricity and the whether successful load of combined floodgate to have electric indicator light (d).