CN203289182U - Double-channel power supply module and double-channel power supply inversion system - Google Patents

Abstract

The utility model relates to a double-channel power supply module and a double-channel power supply inversion system applying the module. The module comprises an AC transformation rectification sub-module and a DC-DC power supply sub-module, wherein the AC transformation rectification sub-module is provided with a DC output terminal and a non-rectified AC output terminal. A DC output terminal of the DC-DC power supply sub-module is connected with the DC output terminal of the AC transformation rectification sub-module. A connection point is a DC output public wiring terminal. A DC input terminal of the DC-DC power supply sub-module, the DC output public wiring terminal, the AC input terminal and the AC output terminal of the AC transformation rectification sub-module respectively form a DC input terminal, a DC output terminal, an AC input terminal and an AC output terminal of the double-channel power supply module, and are provided with a DC power-supply wiring copper bar, an inverter-controlled power supply DC input wiring terminal, an AC bus connection lead and an inverter-controlled power supply AC input wiring terminal. The module and the system provided by the utility model can realize single-channel or double-channel simultaneous power supply of the inversion device and DC output seamless switching.

Description

Dual power supply module and dual power supply inverter system

technical field

The utility model relates to a dual-channel control power supply device and a dual-channel power supply inverter system using the device, which is mainly used in the technical fields of photovoltaic grid-connected power generation, energy storage systems, etc., and can realize DC separate power supply, AC separate power supply or Simultaneous power supply of AC and DC and seamless switching of DC output.

Background technique

Traditional photovoltaic grid-connected inverters, energy storage converters and other equipment usually use external power supply control methods, which have the following disadvantages: 1. The wiring method of the control power supply on the project site is complicated, which brings a lot of inconvenience; 2. The power grid to the inverter Transformers, power distribution cabinets and other equipment should be installed in the intermediate links of the equipment, which greatly increases the investment; 3. During the operation of the equipment connected to the grid, when the grid is abnormal, the control power supply of the external power supply is abnormal, which leads to the failure of the inverter equipment. The power supply of the control power supply on the AC side is abnormal, so that the inverter equipment cannot operate stably; 4. When the power grid is abnormal or the power is cut off, the equipment cannot operate off-grid.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the utility model provides a dual-circuit power supply module and a dual-circuit power supply inverter system using the module. The module can output direct current alone or simultaneously output alternating current and direct current, and can be used as a photovoltaic The power supply modules of grid-connected inverters, energy storage converters and other equipment can provide internal control power supply for some components inside the above equipment, eliminating the disadvantages of external control power supply.

The main technical solution adopted by the utility model is: a dual-circuit power supply module, including an AC transformer rectifier module and a DC-DC power supply module, the AC transformer rectifier module is provided with a DC output terminal and an unrectified The AC output terminal of the DC-DC power supply sub-module is connected to the DC output terminal of the AC transformer rectification sub-module, and the connection point is the DC output common terminal, and the DC input of the DC-DC power supply sub-module terminal, the DC output common terminal, the AC input terminal and the AC output terminal of the AC transformer rectification sub-module respectively constitute the DC input terminal, the DC output terminal, the AC input terminal and the AC output terminal of the dual power supply module, Correspondingly, there are DC power supply wiring copper bars, inverter control power supply DC input terminals, AC bus connection wires and inverter control power supply AC input terminals.

The AC transformation and rectification sub-module may include a transformer and a rectification circuit connected in sequence, the input end of the transformer constitutes the AC input end of the AC transformation and rectification sub-module, and the output end of the transformer may be provided with at least two Taps, one tap constitutes the AC output end of the AC transformation rectification sub-module, the other tap is connected to the input end of the rectification circuit, and the output end of the rectification circuit constitutes the DC output end of the AC transformation rectification sub-module .

The rectification circuit may adopt a bridge rectification circuit.

For any one of the above-mentioned dual power supply modules, as a further optimization, a DC output branch is drawn from the DC output common terminal, and the other end of the DC output branch is used as the output of the dual power supply module. A DC output terminal, the DC output branch is connected with a support capacitor in parallel.

A dual-circuit power supply inverter system includes a DC power supply connected in sequence, a dual-circuit power supply inverter and a power grid, and the dual-circuit power supply inverter is provided with a DC input circuit, an AC output circuit, a device for controlling DC power supply, and The device with AC power supply for control is also provided with any one of the dual-circuit power supply modules described above, the DC input end of the dual-channel power supply module is connected to the input end of the DC input circuit, and the The AC input terminal is connected to the output terminal of the AC output circuit, and the DC output terminal and the AC output terminal of the dual power supply module are respectively connected to the control DC power supply device and the control AC power supply device.

The beneficial effects of the utility model are:

Connect the AC input terminal of the dual power supply module to the AC output terminal of the inverter and other equipment. Once the inverter operates normally, the AC input terminal of the dual power supply module will have voltage, and the AC transformer rectifier module will output DC power. and alternating current, in which the alternating current is used to supply power for some internal devices such as the inverter that need to be connected to the power supply, realizing the self-supply of the AC control power supply part required by the inverter equipment, breaking the traditional external control power supply of the inverter mode, which makes the on-site wiring easier, and there is no need to install supporting transformers and distribution cabinets between the grid and the inverter, which greatly reduces the investment.

With this dual power supply module, when the inverter device is off-grid, the DC-DC power supply sub-module is used as the starting power supply of the inverter device. The inverter device starts automatically when it is off-grid, and automatically switches to the AC transformer rectifier sub-module after startup. For power supply, the inverter equipment works in the grid-connected state. When the power grid is abnormal, it will switch to the DC-DC power supply sub-module for power supply. It can be seen that the combination of the DC-DC power supply sub-module and the AC transformation and rectification sub-module realizes The seamless switching of the DC output enables the equipment to start automatically under the off-grid condition, and the equipment can still operate normally when the grid is abnormal or the power is cut off under the grid-connected state, ensuring the effective control and stable operation of the system.

Description of drawings

Fig. 1 is the circuit schematic block diagram of an embodiment of the dual-way power supply module of the present utility model;

Fig. 2 is a schematic circuit diagram of an embodiment of the dual-circuit power supply inverter system of the present invention.

Detailed ways

The utility model provides a dual-circuit power supply module, as shown in Figure 1, comprising an AC transformer rectifier module and a DC-DC power supply module, the AC transformer rectifier module is provided with a DC output terminal and a rectifier without rectification The AC output terminal of the DC-DC power supply sub-module is connected to the DC output terminal of the AC transformer rectification sub-module. For the convenience of expression, this connection point is called the DC output public terminal. The DC-DC The DC input terminal of the power supply sub-module, the common connection terminal of DC output, the AC input terminal and the AC output terminal of the AC transformer rectification sub-module constitute the DC input terminal, DC output terminal, and AC input terminal of the dual-way power supply module respectively. terminal and AC output terminal, and are respectively equipped with DC power supply wiring copper bars, inverter control power supply DC input terminal, AC bus connection wires and inverter control power supply AC input terminal, which are respectively used to connect the output of the DC power supply terminal, DC input terminal of control power supply in traditional inverter equipment, AC output terminal of traditional inverter equipment, and AC input terminal of control power in traditional inverter equipment. For the convenience of expression, the DC input terminal of the DC-DC power sub-module and The connection point of the DC input terminal of the traditional inverter device is called the DC input common terminal, and the output terminal of the DC power supply (such as a photovoltaic array or battery) is connected to this terminal to provide DC for the traditional inverter device and the DC-DC power sub-module at the same time. enter.

The AC transformation and rectification sub-module may include a transformer and a rectification circuit connected in sequence, the input end of the transformer constitutes the AC input end of the AC transformation and rectification sub-module, and the output end of the transformer is provided with at least two taps , one tap constitutes the AC output end of the AC transformer rectification sub-module, the other tap is connected to the input end of the rectification circuit, and the output end of the rectification circuit constitutes the DC output end of the AC transformer rectification sub-module.

The working mode of the dual power supply module is: when inputting direct current, the DC-DC power supply sub-module works first, and outputs direct current control power to ensure the normal startup of the inverter equipment connected to it; after the equipment is in normal operation, the AC transformation The rectifier sub-module also starts to work, and outputs DC control power and AC control power at the same time to provide DC control power and AC control power to the inverter equipment, wherein the DC control power output by the AC transformer rectifier sub-module suppresses DC- The DC control power output by the DC power supply sub-module; when the input AC power is abnormal, the AC transformation and rectification sub-module stops working, the above suppression stops, and the DC-DC power supply sub-module returns to the independent working state. The above suppression can realize the seamless switching of the DC output.

The dual power supply module is mainly used for various inverter devices. The use and working method of the dual power supply module will be further explained below through the introduction of the dual power supply inverter system of the present invention. The dual-circuit power supply inverter system disclosed in the utility model includes a DC power supply, a dual-circuit power supply inverter and a power grid connected in sequence, and the dual-circuit power supply inverter is connected to the power grid. The difference between the dual power supply inverter and the traditional inverter system is that the above-mentioned dual power supply module is additionally installed on the basis of the traditional inverter, as shown in Figure 2, the traditional inverter except the main inverter circuit In addition, it also includes DC input circuits, AC output circuits, devices powered by DC power for control and devices powered by AC power for control, etc. When in use, the DC input circuit is usually connected to the output terminal of the photovoltaic array or battery, and the AC output circuit is usually connected to the power grid. The DC input terminal of the dual power supply module is connected to the input terminal of the DC input circuit, the AC input terminal of the dual power supply module is connected to the output terminal of the AC output circuit, and the DC input terminal of the dual power supply module The output end and the AC output end are respectively connected to the device powered by DC power for control and the device powered by AC power for control, so as to realize the self-supply of the device that needs to be connected to DC power supply and AC power supply inside the inverter.

The working mode of the dual power supply inverter system is: connect the power supply path from the battery to the inverter, the DC-DC power supply sub-module will work first, and output DC control power to ensure the normal startup of the traditional inverter when it is off-grid ;The traditional inverter has AC output after normal operation, and the working state of the traditional inverter changes to the grid-connected state. The DC control power and AC control power are output to realize the DC control power supply and AC control power supply required by the traditional inverter, respectively. The DC control power output by the DC power supply sub-module, the dual power supply module is automatically switched from the function of the previous DC-DC power supply sub-module to the function of the AC transformation and rectification sub-module, realizing the seamless switching of DC output; when the inverter When an abnormality occurs on the power grid side of the inverter, the AC transformer rectifier sub-module stops working, and returns to the state where the DC-DC power sub-module works alone and outputs DC control power to support the normal startup of the traditional inverter under off-grid conditions.

The AC transformation and rectification sub-module is used in combination with the DC-DC power supply sub-module to realize functions such as seamless switching of DC output, control power supply support, and self-starting of equipment under off-grid conditions, thereby ensuring effective control and Stable operation.

The inverter state switching process in the dual power supply inverter system is as follows:

When the traditional inverter is running off-grid, that is, when there is no AC voltage on the AC side, the DC-DC power supply sub-module in the dual power supply module starts to work. It serves as a starting power supply to provide DC power for the traditional inverter, realizing the Transformer self-starting;

After the traditional inverter is started, it will automatically switch from the DC-DC power supply sub-module to the AC transformation and rectification sub-module, which can realize seamless switching of DC output;

After the traditional inverter is connected to the grid, the AC transformation and rectification sub-module works and outputs AC and DC power at the same time, which can realize the self-supply of the AC control power supply part required by the inverter equipment;

If the AC is abnormal, the AC transformation and rectification sub-module will automatically switch to the DC-DC power sub-module for power supply, thereby realizing the control power supply support.

The rectification circuit in the dual power supply module can adopt the rectification circuit in the prior art, and the bridge rectification circuit is adopted in the utility model.

As a further improvement, a DC output branch can be drawn from the DC output common terminal, and the other end of the DC output branch can be used as the DC output terminal of the dual power supply module. The capacitor on the direct current output branch is used for supporting on the one hand, and smoothing the rectified waveform on the other hand. the

Claims (7)

1. module that supplies power with double circuit, it is characterized in that comprising AC transformation commutator module and DC-DC power supply submodule, described AC transformation commutator module is provided with dc output end and without the ac output end of rectification, the dc output end of described DC-DC power supply submodule is connected with the dc output end of AC transformation commutator module, tie point is direct current output common terminal, the direct-flow input end of described DC-DC power supply submodule, direct current output common terminal, the direct-flow input end that the ac input end of described AC transformation commutator module and ac output end constitute respectively the described module that supplies power with double circuit, dc output end, ac input end and ac output end, and correspondence is provided with the DC power supply copper busbar respectively, inverter control supplying DC input wires terminal, ac bus connects wire and inverter control supply and AC input wires terminal.

2. the module that supplies power with double circuit as claimed in claim 1, it is characterized in that described AC transformation commutator module comprises transformer and the rectification circuit that connects successively, the input of described transformer forms the ac input end of described AC transformation commutator module, the output of described transformer is provided with at least two taps, a tap forms the ac output end of described AC transformation commutator module, another tap connects the input of described rectification circuit, and the output of described rectification circuit forms the dc output end of described AC transformation commutator module.

3. the module that supplies power with double circuit as claimed in claim 2, is characterized in that described rectification circuit adopts bridge rectifier.

4. as claim 1, the 2 or 3 described modules that supply power with double circuit, it is characterized in that drawing a direct current output branch road from described direct current output common terminal, the other end of this direct current output branch road is as the dc output end of the described module that supplies power with double circuit, and this direct current is exported on branch road and is connected to Support Capacitor.

5. inversion system that supplies power with double circuit, it is characterized in that comprising the DC power supply that connects successively, inverter and electrical network supply power with double circuit, the described inverter that supplies power with double circuit is provided with direct-flow input circuit, exchange output circuit, control the device of using Alternating Current Power Supply with device and the control of direct current supply, also be provided with claim 1, 2, 3 or the 4 described modules that supply power with double circuit, the direct-flow input end of the described module that supplies power with double circuit is connected with the input of described direct-flow input circuit, the ac input end of the described module that supplies power with double circuit is connected with the output of described interchange output circuit, the dc output end of the described module that supplies power with double circuit connects described control with the device of direct current supply respectively and controls the device of using Alternating Current Power Supply with ac output end.

6. the inversion system that supplies power with double circuit as claimed in claim 5, is characterized in that described DC power supply is photovoltaic array or battery.

7. the inversion system that supplies power with double circuit as claimed in claim 6, is characterized in that the described described electrical network of inverter access that supplies power with double circuit.

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