Alternating current and direct current hybrid micro-grid topological structure

Abstract

The utility model discloses an AC / DC hybrid micro-grid topological structure, which relates to the technical field of AC / DC hybrid micro-grid topological structures and comprises an AC / DC hybrid micro-grid and a data acquisition and monitoring module used for acquiring data of the AC / DC hybrid micro-grid. The alternating current and direct current hybrid micro-grid comprises an alternating current bus, a direct current bus and a contact current converter. The AC-DC hybrid micro-grid comprises an AC bus, a DC bus and a contact current converter. Selecting a mode of accessing the AC / DC hybrid micro-grid to the power distribution network; selecting the types of the AC bus and the DC bus; selecting the number of contact current converters; the economical efficiency and the reliability of the alternating-current and direct-current hybrid micro-grid topological structure can be improved; and the power supply of an important load in the AC / DC hybrid micro-grid can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to AC / DC hybrid microgrid technical field especially relates to a kind of AC / DC hybrid microgrid topological structure. BACKGROUND

[0002] Due to the impetus of large-scale, long-distance power transmission and distribution technology development, most of the world's electricity uses AC transmission / distribution as the mainstream transmission mode. In recent years, with the development of power electronics technology, DC distribution or power equipment is becoming more and more common. Traditional distribution network mainly uses AC distribution mode, and DC distribution equipment uses a large number of DC / AC converters or AC / DC rectifiers. The DC distribution system can simplify the large number of AC / DC conversion links in existing distribution equipment, reduce energy loss in the transmission process, and improve energy utilization efficiency. Most of the new energy generation and load are DC devices, and the power grid can easily use DC power supply mode. At present, AC power supply is used, so it is necessary to explore DC power supply mode.

[0003] At present, the research on DC distribution network in China is still in its infancy, and there are still a lot of problems to be studied in terms of planning and design, dispatching operation, control and protection, key equipment, economic analysis and other aspects. Many research results on AC / DC distribution technology have not been tested in practice, and need to be continuously improved. It is necessary to carry out corresponding forward-looking research as technical reserves by learning from foreign experience and carrying out related test projects to explore DC distribution suitable technology and operation mode suitable for China's national conditions.

[0004] Because the AC / DC hybrid microgrid contains AC microgrid and DC microgrid at the same time, the complexity of the structure is greatly increased, and the existing topology design method cannot meet the operation requirements. Therefore, our company develops AC / DC hybrid microgrid topology structure to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at the defects and deficiencies of prior art, and provides an AC / DC hybrid microgrid topology structure.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] An AC / DC hybrid microgrid topology structure includes an AC / DC hybrid microgrid and a data acquisition and monitoring module for data acquisition of the AC / DC hybrid microgrid.

[0008] The AC / DC hybrid microgrid includes an AC bus, a DC bus and a tie-in converter; the AC bus and the DC bus are connected with the tie-in converter respectively.

[0009] The data acquisition and monitoring module comprises an alternating voltage data acquisition unit, a direct current voltage data acquisition unit, a switching value acquisition unit, a multiplexing switch, a signal processing module, an analog-digital conversion module, a microcontroller module, a circuit protection module, a display module, an interface module, an alarm module and a data communication module.

[0010] The alternating voltage data acquisition unit, the direct current voltage data acquisition unit and the switching value acquisition unit are connected to the signal processing module through the multiplexing switch, and the signal processing module is connected to the microcontroller module through the analog-digital conversion module; the circuit protection module, the display module, the interface module, the alarm module and the data communication module are connected to the microcontroller module.

[0011] As a further preferred scheme of the utility model discloses a kind of AC-DC hybrid microgrid topological structure, the signal processing module includes amplifier circuit and double operational amplifier band pass filter, and the amplifier circuit is composed of OPA277 operational amplifier and resistance capacitor, and the double operational amplifier band pass filter is composed of 2 OPA277 operational amplifier.

[0012] As a further preferred scheme of the utility model discloses a kind of AC-DC hybrid microgrid topological structure, the circuit protection module includes reference voltage circuit and feedback control circuit;

[0013] Reference voltage circuit, for generating reference voltage according to source voltage when source voltage exceeds clamping voltage;

[0014] Feedback control circuit, for receiving reference voltage and clamping output voltage to clamping voltage;

[0015] Specifically comprising the first diode Z1, the second diode Z2, the third diode Z3, the fourth diode Z4, the fifth diode Z5, the first resistor R1, the second resistor R2, the third resistor R3, the PMOS tube M1, the PMOS tube M2, the PMOS tube M3, the PMOS tube M4; the anode of the first diode Z1 is connected with one end of the first resistor R1, the anode and cathode of the first diode Z1 is connected with the cathode of the second diode Z2, the anode of the second diode Z2 is connected with the cathode of the third diode Z3, the anode of the third diode Z3 is connected with one end of the second resistor R2, the anode of the fourth diode Z4, one end of the third resistor R3, the anode of the fifth diode Z5 and the source of the PMOS tube M1 respectively, the other end of the first resistor R1 is connected with the drain of the PMOS tube M3, the gate of the PMOS tube M3 and the gate of the PMOS tube M4 respectively, the source of the PMOS tube M3 is connected with the source of the PMOS tube M4, the drain of the PMOS tube M2 and the drain of the PMOS tube M1 respectively, the drain of the PMOS tube M4 is connected with the other end of the second resistor R2, the cathode of the fourth diode Z4 and the gate of the PMOS tube M2 respectively, the source of the PMOS tube M2 is connected with the other end of the third resistor R3, the cathode of the fifth diode Z5 and the gate of the PMOS tube M1 respectively.

[0016] As a further preferred scheme of the utility model discloses a kind of AC-DC hybrid micro-grid topology structure, the data communication module contains antenna ANT1, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, resistance R21, resistance R22, inductance L11, inductance L12, chip U1, chip U2, chip U3, antenna ANT1 is connected respectively inductance L11 one end, capacitor C16 one end, the other end of inductance L11 is grounded, the other end of capacitor C16 is respectively connected inductance L12 one end and chip U1 pin 2, the other end of inductance L12 is grounded, chip U1 pin 3 and chip U1 pin 4 respectively connect capacitor C14 one end, capacitor C15 one end and VDD end, the other end of capacitor C14, the other end of capacitor C15 is respectively grounded, chip U1 pin 1 respectively connect capacitor C13 one end, VDD end, chip U1 pin 30 and chip U1 pin 29, the other end of capacitor C13 is grounded, chip U1 pin 31 connects resistance R21 one end, the other end of resistance R21 is grounded, chip U1 pin 28 respectively connect capacitor C11 one end and chip U2 pin 1, chip U2 pin 2 is grounded, the other end of capacitor C11 is grounded, chip U2 pin 4 is grounded, chip U2 pin 3 respectively connect capacitor C12 one end and chip U1 pin 27, the other end of capacitor C12 is grounded, chip U1 pin 18 connects chip U3 pin 7, chip U1 pin 19 connects chip U3 pin 3, chip U1 pin 20 connects chip U3 pin 1, chip U1 pin 21 passes through resistance R22 and connects chip U3 pin 6, chip U1 pin 22 connects chip U3 pin 2, chip U1 pin 23 connects chip U3 pin 5, chip U1 pin 17 respectively connect chip U1 pin 11 and VDD end.

[0017] As a further preferred scheme of the utility model discloses a kind of AC-DC hybrid micro-grid topology structure, the analog-digital conversion module uses the analog-digital converter of model AD7794.

[0018] As a further preferred scheme of the utility model discloses a kind of AC-DC hybrid micro-grid topology structure, the display module is touch screen type display module.

[0019] The utility model discloses above technical scheme compared with prior art has the following technical effects:

[0020] The utility model discloses a kind of AC-DC hybrid microgrid topological structures, including AC-DC hybrid microgrid, and data acquisition and monitoring module for each data acquisition of AC-DC hybrid microgrid;The AC-DC hybrid microgrid includes AC bus, DC bus and tie converter;AC-DC hybrid microgrid includes AC bus, DC bus and tie converter;The mode of AC-DC hybrid microgrid access distribution network is selected;The type of AC bus and DC bus is selected;The quantity of tie converter is selected;Help to improve the economy and reliability of AC-DC hybrid microgrid topological structure;Help to guarantee the power supply of important load in AC-DC hybrid microgrid. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the utility model, and constitute a part of this application, but do not constitute improper limitation to the utility model, in the drawings:

[0022] Figure 1 It is the overall structure principle diagram of the utility model of a kind of AC-DC hybrid microgrid topological structure;

[0023] Figure 2 It is the principle diagram of the utility model AC-DC hybrid microgrid;

[0024] Figure 3 It is the principle diagram of the utility model data acquisition and monitoring module;

[0025] Figure 4 It is the principle diagram of the utility model circuit protection module;

[0026] Figure 5 It is the circuit diagram of the utility model data communication module. DETAILED DESCRIPTION

[0027] The utility model will be described in detail in conjunction with the drawings and specific embodiment, the illustrative embodiment and the description are only used to explain the utility model, but not as the limitation to the utility model.

[0028] The technical scheme in the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection:

[0029] A kind of AC-DC hybrid microgrid topological structure, as Figure 1 Shown, including AC-DC hybrid microgrid, and data acquisition and monitoring module for each data acquisition of AC-DC hybrid microgrid;

[0030] As Figure 2 described, the AC-DC hybrid micro-grid contains an AC bus, a DC bus and a tie converter; the AC bus and the DC bus are connected with the tie converter respectively;

[0031] As Figure 3 shown, the data acquisition and monitoring module contains an AC voltage data acquisition unit, a DC voltage data acquisition unit, a switching value acquisition unit, a multiplexing switch, a signal processing module, an analog-digital conversion module, a microcontroller module, a circuit protection module, a display module, an interface module, an alarm module and a data communication module;

[0032] The utility model selects the mode of AC-DC hybrid micro-grid access distribution network; selects the type of AC bus and DC bus; selects the number of tie converter; it is helpful to improve the economy and reliability of AC-DC hybrid micro-grid topology structure; it is helpful to guarantee the power supply of important load in AC-DC hybrid micro-grid.

[0033] The AC voltage data acquisition unit, the DC voltage data acquisition unit and the switching value acquisition unit are connected with the signal processing module through the multiplexing switch respectively, and the signal processing module is connected with the microcontroller module through the analog-digital conversion module; the circuit protection module, the display module, the interface module, the alarm module and the data communication module are connected with the microcontroller module respectively.

[0034] The signal processing module contains an amplification circuit and a double operational amplifier band pass filter, the amplification circuit is composed of OPA277 operational amplifier and resistance capacitor, and the double operational amplifier band pass filter is composed of two OPA277 operational amplifiers.

[0035] The circuit protection module contains a reference voltage circuit and a feedback control circuit.

[0036] The reference voltage circuit is used for generating reference voltage according to source voltage when the source voltage exceeds clamping voltage.

[0037] The feedback control circuit is used for receiving reference voltage and clamping output voltage to clamping voltage.

[0038] As Figure 4As shown, specifically comprising the first diode Z1, the second diode Z2, the third diode Z3, the fourth diode Z4, the fifth diode Z5, the first resistor R1, the second resistor R2, the third resistor R3, the PMOS M1, the PMOS M2, the PMOS M3, the PMOS M4; the anode of the first diode Z1 is connected to one end of the first resistor R1, the cathode of the second diode Z2 is connected to the anode of the first diode Z1, the anode of the second diode Z2 is connected to the cathode of the third diode Z3, the anode of the third diode Z3 is connected to one end of the second resistor R2, the anode of the fourth diode Z4, one end of the third resistor R3, the anode of the fifth diode Z5 and the source of the PMOS M1 respectively, the other end of the first resistor R1 is connected to the drain of the PMOS M3, the gate of the PMOS M3 and the gate of the PMOS M4 respectively, the source of the PMOS M3 is connected to the source of the PMOS M4, the drain of the PMOS M2 and the drain of the PMOS M1 respectively, the drain of the PMOS M4 is connected to the other end of the second resistor R2, the cathode of the fourth diode Z4 and the gate of the PMOS M2 respectively, the source of the PMOS M2 is connected to the other end of the third resistor R3, the cathode of the fifth diode Z5 and the gate of the PMOS M1 respectively. The overvoltage protection circuit comprises a reference voltage circuit and a feedback control circuit, the reference voltage circuit generates a reference voltage according to the source voltage when the source voltage exceeds the clamping voltage, and the feedback control circuit is used to receive the reference voltage and clamp the output voltage to the clamping voltage, and due to the existence of the feedback control circuit, the clamping voltage will not change with the current, effectively ensuring that the voltage provided to the protected electronic device does not exceed its breakdown voltage.

[0039] As Figure 5As shown, the data communication module comprises an antenna ANT1, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a resistor R21, a resistor R22, an inductor L11, an inductor L12, a chip U1, a chip U2, a chip U3, the antenna ANT1 is connected to one end of the inductor L11 and one end of the capacitor C16 respectively, the other end of the inductor L11 is grounded, the other end of the capacitor C16 is connected to one end of the inductor L12 and a pin 2 of the chip U1 respectively, the other end of the inductor L12 is grounded, a pin 3 of the chip U1 and a pin 4 of the chip U1 are connected to one end of the capacitor C14, one end of the capacitor C15 and a VDD terminal respectively, the other end of the capacitor C14 and the other end of the capacitor C15 are grounded respectively, a pin 1 of the chip U1 is connected to one end of the capacitor C13, the VDD terminal, a pin 30 of the chip U1 and a pin 29 of the chip U1 respectively, the other end of the capacitor C13 is grounded, a pin 31 of the chip U1 is connected to one end of the resistor R21, the other end of the resistor R21 is grounded, a pin 28 of the chip U1 is connected to one end of the capacitor C11 and a pin 1 of the chip U2 respectively, a pin 2 of the chip U2 is grounded, the other end of the capacitor C11 is grounded, a pin 4 of the chip U2 is grounded, a pin 3 of the chip U2 is connected to one end of the capacitor C12 and a pin 27 of the chip U1 respectively, the other end of the capacitor C12 is grounded, a pin 18 of the chip U1 is connected to a pin 7 of the chip U3, a pin 19 of the chip U1 is connected to a pin 3 of the chip U3, a pin 20 of the chip U1 is connected to a pin 1 of the chip U3, a pin 21 of the chip U1 is connected to a pin 6 of the chip U3 through the resistor R22, a pin 22 of the chip U1 is connected to a pin 2 of the chip U3, a pin 23 of the chip U1 is connected to a pin 5 of the chip U3, a pin 17 of the chip U1 is connected to a pin 11 of the chip U1 and the VDD terminal respectively. It selects ESP8266 as the master control chip, and when used as a communication module, the terminal device is connected to the Internet for data transmission through serial port conversion WIFI, the communication mode adopts a basic network topology structure, ESP8266 is a serial port conversion wireless module chip, internally has a built-in firmware, and user operation is simple, without the need to write timing signals.

[0040] The analog-digital conversion module adopts an analog-digital converter with a model number of AD7794.

[0041] The display module is a touch screen type display module.

[0042] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0043] The above embodiments only illustrate the technical thought of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical scheme according to the technical thought of the present application falls within the protection scope of the present application. The embodiments of the present application are described in detail above, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. An AC / DC hybrid microgrid topology, characterized in that: The AC / DC hybrid micro-grid comprises an AC bus, a DC bus and a tie-in converter, and the AC bus and the DC bus are connected with the tie-in converter respectively. The data acquisition and monitoring module comprises an AC voltage data acquisition unit, a DC voltage data acquisition unit, a switching value acquisition unit, a multiplexing switch, a signal processing module, an analog-digital conversion module, a microcontroller module, a circuit protection module, a display module, an interface module, an alarm module and a data communication module. The AC voltage data acquisition unit, the DC voltage data acquisition unit and the switching value acquisition unit are connected with the signal processing module through the multiplexing switch, and the signal processing module is connected with the microcontroller module through the analog-digital conversion module. The circuit protection module, the display module, the interface module, the alarm module and the data communication module are connected with the microcontroller module respectively. 2.The AC / DC hybrid microgrid topology of claim 1, wherein: The signal processing module comprises an amplification circuit and a double-operational-amplifier band-pass filter, the amplification circuit is composed of an OPA277 operational amplifier and resistors and capacitors, and the double-operational-amplifier band-pass filter is composed of two OPA277 operational amplifiers. 3.The AC / DC hybrid microgrid topology of claim 1, wherein: The circuit protection module comprises a reference voltage circuit and a feedback control circuit. The reference voltage circuit is used for generating a reference voltage according to a source voltage when the source voltage exceeds a clamping voltage. The feedback control circuit is used for receiving the reference voltage and clamping an output voltage to the clamping voltage. The circuit specifically comprises a first diode Z1, a second diode Z2, a third diode Z3, a fourth diode Z4, a fifth diode Z5, a first resistor R1, a second resistor R2, a third resistor R3, a PMOS tube M1, a PMOS tube M2, a PMOS tube M3 and a PMOS tube M4; an anode of the first diode Z1 is connected with one end of the first resistor R1, cathodes of the first diode Z1 and the second diode Z2 are connected, an anode of the second diode Z2 is connected with a cathode of the third diode Z3, an anode of the third diode Z3 is connected with one end of the second resistor R2, an anode of the fourth diode Z4, one end of the third resistor R3, an anode of the fifth diode Z5 and a source of the PMOS tube M1 respectively, the other end of the first resistor R1 is connected with a drain of the PMOS tube M3, a gate of the PMOS tube M3 and a gate of the PMOS tube M4 respectively, a source of the PMOS tube M3 is connected with a source of the PMOS tube M4, a drain of the PMOS tube M2 and a drain of the PMOS tube M1 respectively, a drain of the PMOS tube M4 is connected with the other end of the second resistor R2, a cathode of the fourth diode Z4 and a gate of the PMOS tube M2 respectively, a source of the PMOS tube M2 is connected with the other end of the third resistor R3, a cathode of the fifth diode Z5 and a gate of the PMOS tube M1 respectively. 4.The AC / DC hybrid microgrid topology of claim 1, wherein: The data communication module comprises an antenna ANT1, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a capacitor C15, a capacitor C16, a resistor R21, a resistor R22, an inductor L11, an inductor L12, a chip U1, a chip U2, a chip U3, the antenna ANT1 is connected to one end of the inductor L11 and one end of the capacitor C16 respectively, the other end of the inductor L11 is grounded, the other end of the capacitor C16 is connected to one end of the inductor L12 and a pin 2 of the chip U1 respectively, the other end of the inductor L12 is grounded, a pin 3 of the chip U1 and a pin 4 of the chip U1 are connected to one end of the capacitor C14, one end of the capacitor C15 and a VDD terminal respectively, the other end of the capacitor C14 and the other end of the capacitor C15 are grounded respectively, a pin 1 of the chip U1 is connected to one end of the capacitor C13, the VDD terminal, a pin 30 of the chip U1 and a pin 29 of the chip U1 respectively, the other end of the capacitor C13 is grounded, a pin 31 of the chip U1 is connected to one end of the resistor R21, the other end of the resistor R21 is grounded, a pin 28 of the chip U1 is connected to one end of the capacitor C11 and a pin 1 of the chip U2 respectively, a pin 2 of the chip U2 is grounded, the other end of the capacitor C11 is grounded, a pin 4 of the chip U2 is grounded, a pin 3 of the chip U2 is connected to one end of the capacitor C12 and a pin 27 of the chip U1 respectively, the other end of the capacitor C12 is grounded, a pin 18 of the chip U1 is connected to a pin 7 of the chip U3, a pin 19 of the chip U1 is connected to a pin 3 of the chip U3, a pin 20 of the chip U1 is connected to a pin 1 of the chip U3, a pin 21 of the chip U1 is connected to a pin 6 of the chip U3 through the resistor R22, a pin 22 of the chip U1 is connected to a pin 2 of the chip U3, a pin 23 of the chip U1 is connected to a pin 5 of the chip U3, and a pin 17 of the chip U1 is connected to a pin 11 of the chip U1 and the VDD terminal respectively.

5. The AC / DC hybrid microgrid topology of claim 1, wherein: The analog-to-digital conversion module adopts an analog-to-digital converter with a model number AD7794.

6. The AC-DC hybrid micro-grid topology structure of claim 1, wherein the display module is a touch screen display module.

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