Multi-power-source integration device and power supply system

Abstract

The invention discloses a multi-power-source integration device and a power supply system, and relates to the field of power, and the device comprises a controller which is used for transmitting a voltage processing signal to a first conversion module or a second conversion module; the first conversion module is used for converting an alternating-current voltage input by an alternating-current voltage source into a target direct-current bus voltage and outputting the target direct-current bus voltage to a direct-current bus when receiving the voltage processing signal; and the second conversion module is used for converting the direct-current voltage input by the direct-current voltage source into target direct-current bus voltage and outputting the target direct-current bus voltage to the direct-current bus when receiving the voltage processing signal. A first conversion module is arranged to be responsible for converting alternating current into direct current and converting voltage into target direct current bus voltage, and a second conversion module is arranged to be responsible for converting the voltage of the direct current into the target direct current bus voltage. The power integration of the direct-current voltage source and the alternating-current voltage source is realized, and then the power is output to the direct-current bus, so that the power supply for the load is more stable.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and in particular to a multi-power source integration device and a power supply system. Background Art

[0002] With the gradual development of energy security issues, emerging energy sources such as wind power and photovoltaics have become important development directions. However, for equipment that uses multiple methods to generate electricity, these energy sources have problems such as complex frequencies and multiple types of AC and DC, and the equipment cannot directly use the obtained electric energy. In view of the above problems, seeking to avoid the waste of power sources and improve the full utilization of power sources is a problem that technicians in this field are trying their best to solve. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-power source integration device and a power supply system, which realizes the power integration of a DC voltage source and an AC voltage source, and then outputs the power to a DC bus, so as to provide more stable power supply to the load.

[0004] In order to solve the above technical problems, the present invention provides a multi-power source integration device, comprising:

[0005] A controller, wherein a first output end of the controller is connected to a control end of the first conversion module, a second output end of the controller is connected to a control end of the second conversion module, and the controller is used to send a voltage processing signal to the first conversion module or the second conversion module;

[0006] The first conversion module, wherein the input end of the first conversion module is connected to the output end of the AC voltage source, the output end of the first conversion module is connected to the DC bus, and the first conversion module is used to convert the AC voltage input by the AC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal;

[0007] A second conversion module, wherein the input end of the second conversion module is connected to the output end of the DC voltage source, the output end of the second conversion module is connected to the output end of the first conversion module, and the second conversion module is used to convert the DC voltage input by the DC voltage source into the target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal.

[0008] On the other hand, it also includes a third conversion module and a fourth conversion module;

[0009] The input end of the third conversion module and the input end of the fourth conversion module are connected to the DC bus, and the output end of the third conversion module and the output end of the fourth conversion module are both connected to the power supply end of the load;

[0010] The third conversion module is used to step up or step down the target DC bus voltage on the DC bus to supply power to the load;

[0011] The third conversion module is used to step up or down the target DC bus voltage on the DC bus and convert it into AC power to supply power to the load.

[0012] On the other hand, the first conversion module includes a rectifier bridge and a first disconnect switch;

[0013] The output positive terminal of the AC voltage source is connected to the first terminal of the first disconnect switch, the second terminal of the first disconnect switch is connected to the input positive terminal of the rectifier bridge, the control terminal of the first disconnect switch is connected to the controller, the output negative terminal of the AC voltage source is connected to the input negative terminal of the rectifier bridge, the output positive terminal of the rectifier bridge is connected to the positive terminal of the DC bus, and the output negative terminal of the rectifier bridge is connected to the negative terminal of the DC bus;

[0014] The controller is also used to control the first disconnect switch to be disconnected so that the first conversion module stops converting the AC voltage into a DC voltage, and the rectifier bridge is used to convert the AC voltage output by the AC voltage source into a DC voltage and boost the voltage.

[0015] On the other hand, the first conversion module includes an anti-reverse module, a boost module and a second cut-off switch;

[0016] The output positive end of the DC voltage source is connected to the first end of the second disconnect switch, the second end of the second disconnect switch is connected to the input positive end of the anti-reverse module, the control end of the second disconnect switch is connected to the controller, the output negative end of the DC voltage source is connected to the input negative end of the anti-reverse module, the output positive end of the anti-reverse module is connected to the input positive end of the boost module, the output negative end of the anti-reverse module is connected to the input negative end of the boost module, the output positive end of the boost module is connected to the positive end of the DC bus, and the output negative end of the boost module is connected to the negative end of the DC bus;

[0017] The controller is also used to control the second disconnect switch to disconnect so that the second conversion module stops boosting the DC voltage. The anti-reverse module is used to prevent the voltage of the DC bus from flowing into the DC voltage source. The boost module is used to boost the DC voltage output by the DC voltage source.

[0018] On the other hand, it also includes a first current sensor, a second current sensor and a third current sensor;

[0019] The first current sensor is arranged between the input end of the first conversion module and the output end of the AC voltage source, and is used to detect the output current of the AC voltage source;

[0020] The second current sensor is arranged between the input end of the second conversion module and the output end of the DC voltage source, and is used to detect the output current of the AC voltage source;

[0021] The third current sensor is arranged at a common end connected to the output end of the second conversion module and the output end of the first conversion module, and is used to detect the current output to the DC bus;

[0022] The controller is specifically used to send a voltage processing signal to the first conversion module or the second conversion module, and control the first disconnect switch and / or the second disconnect switch to disconnect according to the output current of the AC voltage source, the output current of the AC voltage source and the current output to the DC bus.

[0023] On the other hand, the number of the first conversion module and the number of the second conversion module are both multiple;

[0024] The control end of each first conversion module is connected to the first output end of the controller, the input end of each first conversion module is connected to an AC voltage source, the output positive ends of the plurality of first conversion modules are connected, and the common end of the connections is connected to the positive end of the DC bus;

[0025] The control end of each second conversion module is connected to the second output end of the controller, the input end of each second conversion module is connected to a DC voltage source, the output positive ends of multiple second conversion modules are connected, and the common end of the connections is connected to the positive end of the DC bus.

[0026] On the other hand, it also includes a starting resistor, a first pre-charge capacitor and a second pre-charge capacitor;

[0027] The first end of the starting resistor is connected to the positive end of the DC bus, the second end of the pre-charge group is connected to the first end of the first pre-charge capacitor and the first end of the second pre-charge capacitor, and the second end of the first pre-charge capacitor and the second end of the second pre-charge capacitor are both connected to the negative electrode of the DC bus;

[0028] The controller is also used to pre-control the DC bus to charge the first pre-charge capacitor and the second pre-charge capacitor through the starting resistor.

[0029] On the other hand, it also includes a first diode, a second diode and a third diode;

[0030] The anode of the first diode is connected to the anode of the second diode, and the common end of the connections is connected to the first end of the starting resistor, the cathode of the first diode is connected to the second end of the starting resistor, the cathode of the second diode is connected to the anode of the third diode, and the common end of the connections is grounded, and the cathode of the third diode is connected to the negative end of the DC bus;

[0031] The first diode, the second diode and the third diode are all used for reverse protection.

[0032] To solve the above technical problem, the present invention further provides a power supply system, including a DC bus and a plurality of the above multi-power source integration devices, wherein the output end of each of the multi-power source integration devices is connected to the DC bus.

[0033] On the other hand, it also includes batteries;

[0034] The power supply end of the storage battery is connected to the DC bus, and the communication end of the storage battery is connected to the controller in the multi-power source integration device;

[0035] The power supply end of the storage battery is used to charge the DC bus with the voltage on the DC bus when the voltage on the DC bus meets the load demand, and to charge the DC bus when the voltage on the DC bus does not meet the load demand. The communication end of the storage battery is used to send its own working state to the controller, and the working state includes a combination of one or more of the battery power, battery temperature, charge and discharge current and charge and discharge voltage, and the working state is related to the target DC bus voltage;

[0036] The controller is specifically configured to send a voltage processing signal to a first conversion module or a second conversion module in the multi-power source integration device according to the working state.

[0037] The present application provides a multi-power source integration device and power supply system, which relates to the field of electric power, including: a controller for sending a voltage processing signal to a first conversion module or a second conversion module; the first conversion module is used to convert the AC voltage input by the AC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal; the second conversion module is used to convert the DC voltage input by the DC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal. A first conversion module is provided to be responsible for converting AC power into DC power and converting the voltage to the target DC bus voltage, and a second conversion module is provided to be responsible for converting the voltage of DC power into the target DC bus voltage. The power integration of the DC voltage source and the AC voltage source is realized, and then output to the DC bus, so that the power supply to the load is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of the structure of a multi-power source integration device provided by the present invention;

[0040] Figure 2 A schematic diagram of the structure of another multi-power source integration device provided by the present invention;

[0041] Figure 3 A schematic structural diagram of a power supply system provided by the present invention. DETAILED DESCRIPTION

[0042] The core of the present invention is to provide a multi-power source integration device and a power supply system, which realizes the power integration of the DC voltage source and the AC voltage source, and then outputs it to the DC bus, so as to provide more stable power supply to the load.

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Figure 1 The present invention provides a schematic diagram of a multi-power source integration device, the multi-power source integration device comprising:

[0045] A controller 1, wherein a first output end of the controller 1 is connected to a control end of the first conversion module 2, and a second output end of the controller 1 is connected to a control end of the second conversion module 3, and the controller 1 is used to send a voltage processing signal to the first conversion module 2 or the second conversion module 3;

[0046] A first conversion module 2, wherein an input end of the first conversion module 2 is connected to an output end of the AC voltage source, and an output end of the first conversion module 2 is connected to a DC bus. The first conversion module 2 is used for converting an AC voltage input by the AC voltage source into a target DC bus voltage and then outputting the target DC bus voltage to the DC bus when receiving a voltage processing signal;

[0047] The second conversion module 3, the input end of the second conversion module 3 is connected to the output end of the DC voltage source, the output end of the second conversion module 3 is connected to the output end of the first conversion module 2, and the second conversion module 3 is used to convert the DC voltage input by the DC voltage source into a target DC bus voltage and then output it to the DC bus when receiving a voltage processing signal.

[0048] Emerging energy sources such as wind power and photovoltaics need to be optimized due to their low power, complex frequency, multiple AC and DC types, and poor power quality. There are many types of power sources for vehicles, including photovoltaic power generation to convert solar energy into electricity, wind turbines to convert wind energy into electricity, electricity generated by the vehicle's traction motor, and electricity transmitted from the ground. Considering that the above power sources generate different types of electricity, which may be AC ​​or DC, the same generated electricity may not be directly connected to the DC bus and needs to be processed before it can be connected.

[0049] Therefore, the present application provides a first conversion module 2 and a second conversion module 3. The first conversion module 2 is connected to an AC voltage source to convert the AC voltage output by the AC voltage source into a DC voltage, and the DC voltage is converted into a target DC bus voltage matching the DC bus. The second conversion module 3 is connected to a DC voltage source to convert the DC voltage output by the DC voltage source into a target DC bus voltage matching the DC bus.

[0050] Specifically, the conversion process is often a boost process. Power sources such as DC and variable frequency AC from different sources can be boosted to a high-voltage DC bus voltage, and controlled rectification or uncontrolled rectification is applied to boost the variable frequency AC to the DC bus voltage. The BOOST circuit is used to boost the DC to the DC bus voltage. The boost process of the first conversion module 2 and the second conversion module 3 is often controlled by a switch tube, and the switch tube is controlled by the controller 1. The controller 1 sends a voltage processing signal to the first conversion module 2 and the second conversion module 3 according to the input characteristics of each channel, so as to set the on-off timing of each switch tube.

[0051] The present application provides a multi-power source integration device and power supply system, which relates to the field of electric power, including: a controller 1 is used to send a voltage processing signal to a first conversion module 2 or a second conversion module 3; the first conversion module 2 is used to convert the AC voltage input by the AC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal; the second conversion module 3 is used to convert the DC voltage input by the DC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal. The first conversion module 2 is set to be responsible for converting AC power into DC power and converting the voltage to the target DC bus voltage, and the second conversion module 3 is set to be responsible for converting the voltage of DC power to the target DC bus voltage. The power integration of the DC voltage source and the AC voltage source is realized, and then output to the DC bus, so that the power supply to the load is more stable.

[0052] Based on the above embodiments:

[0053] Figure 2 A schematic diagram of the structure of another multi-power source integration device provided by the present invention;

[0054] In some embodiments, a third conversion module 4 and a fourth conversion module 5 are further included;

[0055] The input end of the third conversion module 4 and the input end of the fourth conversion module 5 are connected to the DC bus, and the output end of the third conversion module 4 and the output end of the fourth conversion module 5 are both connected to the power supply end of the load;

[0056] The third conversion module 4 is used to step up or step down the target DC bus voltage on the DC bus to supply power to the load;

[0057] The third conversion module 4 is used to step up or step down the target DC bus voltage on the DC bus and convert it into AC power to supply power to the load.

[0058] Considering that the user's load has different requirements for power, some loads may require direct current, some loads may require alternating current, and the voltages required by the loads are also different. Therefore, the voltage output by the DC bus also needs to be processed before supplying power to the load.

[0059] Specifically, the third conversion module 4 is provided to step up or step down the target DC bus voltage on the DC bus, and the fourth conversion module 5 not only needs to step up or step down the target DC bus voltage on the DC bus, but also needs to convert the DC power into AC power. The specific step-up or step-down can be processed according to the actual needs of the load, and this application does not make too many restrictions here.

[0060] In some embodiments, the first conversion module 2 includes a rectifier bridge U1 and a first disconnect switch S1;

[0061] The output positive terminal of the AC voltage source is connected to the first terminal of the first disconnect switch S1, the second terminal of the first disconnect switch S1 is connected to the input positive terminal of the rectifier bridge U1, the control terminal of the first disconnect switch S1 is connected to the controller 1, the output negative terminal of the AC voltage source is connected to the input negative terminal of the rectifier bridge U1, the output positive terminal of the rectifier bridge U1 is connected to the positive terminal of the DC bus, and the output negative terminal of the rectifier bridge U1 is connected to the negative terminal of the DC bus;

[0062] The controller 1 is also used to control the first disconnect switch S1 to be disconnected so that the first conversion module 2 stops converting the AC voltage into the DC voltage. The rectifier bridge U1 is used to convert the AC voltage output by the AC voltage source into the DC voltage and boost the voltage.

[0063] It should be noted that the rectifier bridge U1 used in this application is a half-bridge rectifier, which adopts a rectifier bridge U1 composed of two diodes and two MOS tubes. The controller 1 controls the conduction and shutdown of the MOS tube to achieve half-bridge boost, converting AC power into DC power and boosting it.

[0064] Furthermore, considering that the voltage input by the AC voltage source may be relatively high and may damage the rectifier bridge U1 , a first disconnecting switch S1 is provided, and the controller 1 may control the first disconnecting switch S1 to be disconnected to prevent damage to the rectifier bridge U1 .

[0065] It should also be noted that there should be an inductor in the circuit. In this application, the inductor in the AC voltage source is reused to reduce the complexity of the device.

[0066] In some embodiments, the first conversion module 2 includes an anti-reverse module U2, a boost module U3 and a second cut-off switch S2;

[0067] The output positive end of the DC voltage source is connected to the first end of the second disconnect switch S2, the second end of the second disconnect switch S2 is connected to the input positive end of the anti-reverse module U2, the control end of the second disconnect switch S2 is connected to the controller 1, the output negative end of the DC voltage source is connected to the input negative end of the anti-reverse module U2, the output positive end of the anti-reverse module U2 is connected to the input positive end of the boost module U3, the output negative end of the anti-reverse module U2 is connected to the input negative end of the boost module U3, the output positive end of the boost module U3 is connected to the positive end of the DC bus, and the output negative end of the boost module U3 is connected to the negative end of the DC bus;

[0068] The controller 1 is also used to control the second disconnect switch S2 to be disconnected so that the second conversion module 3 stops boosting the DC voltage. The anti-reverse module U2 is used to prevent the voltage of the DC bus from flowing into the DC voltage source. The boost module U3 is used to boost the DC voltage output by the DC voltage source.

[0069] The anti-reverse module U2 of the present application is a bridge type composed of four diodes. The anti-reverse module U2 can prevent the DC current of the DC bus from returning to the DC voltage source, so the anti-reverse module U2 is provided.

[0070] The boost module U3 adopts the BOOST boost mode to boost the DC voltage, and the controller 1 controls the switch tube in the boost module U3 to achieve boost control.

[0071] Furthermore, considering that the voltage input by the DC voltage source may be high and may damage the anti-reverse module U2 and the boost module U3, a second disconnect switch S2 is provided, and the controller 1 can control the second disconnect switch S2 to disconnect to prevent damage to the anti-reverse module U2 and the boost module U3.

[0072] In some embodiments, a first current sensor SB1, a second current sensor SB2 and a third current sensor SB3 are further included;

[0073] The first current sensor SB1 is arranged between the input end of the first conversion module 2 and the output end of the AC voltage source, and is used to detect the output current of the AC voltage source;

[0074] The second current sensor SB2 is arranged between the input end of the second conversion module 3 and the output end of the DC voltage source, and is used to detect the output current of the AC voltage source;

[0075] The third current sensor SB3 is arranged at a common end connected to the output end of the second conversion module 3 and the output end of the first conversion module 2, and is used to detect the current output to the DC bus;

[0076] The controller 1 is specifically used to send a voltage processing signal to the first conversion module 2 or the second conversion module 3, and control the first disconnect switch S1 and / or the second disconnect switch S2 to disconnect according to the output current of the AC voltage source, the output current of the AC voltage source and the current output to the DC bus.

[0077] In order to determine the disconnection time of the first disconnecting switch S1 and the second disconnecting switch S2, the first current sensor SB1, the second current sensor SB2 and the third current sensor SB3 are provided to detect the current. If the detected current exceeds the corresponding threshold, the disconnecting switch on the circuit is controlled to be disconnected.

[0078] Furthermore, a current sensor may be provided behind the rectifier bridge U1 of the first conversion module 2, and a current sensor may be provided behind the anti-reverse module U2 of the second conversion module 3 for supplementary detection.

[0079] In some embodiments, the number of the first conversion module 2 and the number of the second conversion module 3 are both multiple;

[0080] The control end of each first conversion module 2 is connected to the first output end of the controller 1, the input end of each first conversion module 2 is connected to an AC voltage source, the output positive ends of the plurality of first conversion modules 2 are connected, and the common end of the connections is connected to the positive end of the DC bus;

[0081] The control end of each second conversion module 3 is connected to the second output end of the controller 1, the input end of each second conversion module 3 is connected to a DC voltage source, the output positive ends of multiple second conversion modules 3 are connected, and the common end of the connection is connected to the positive end of the DC bus.

[0082] It should be noted that, considering that the number of DC voltage sources may be large and the number of AC voltage sources may also be large, each multi-power source integration device may include multiple first conversion modules 2 and multiple second conversion modules 3. Each first conversion module 2 is only connected to one AC voltage source, and each second conversion module 3 is directly connected to one DC voltage source. The output ends of multiple first conversion modules 2 and multiple second conversion modules 3 are connected and output to the DC bus. The operations of each first conversion module 2 and each second conversion module 3 do not interfere with each other.

[0083] In some embodiments, it also includes a startup resistor R, a first pre-charge capacitor C1 and a second pre-charge capacitor C2;

[0084] The first end of the starting resistor R is connected to the positive end of the DC bus, the second end of the pre-charge group is connected to the first end of the first pre-charge capacitor C1 and the first end of the second pre-charge capacitor C2, and the second end of the first pre-charge capacitor C1 and the second end of the second pre-charge capacitor C2 are both connected to the negative electrode of the DC bus;

[0085] The controller 1 is also used to pre-control the DC bus to charge the first pre-charge capacitor C1 and the second pre-charge capacitor C2 through the starting resistor R.

[0086] Considering that the DC bus voltage is high in the initial stage, directly starting the first conversion module 2 or the second conversion module 3 may cause a surge voltage, so precharging is required. Precharging the first precharge capacitor C1 and the second precharge capacitor C2 in advance can reduce the generation of surge voltage.

[0087] In the present application, the starting resistor R is configured as a plurality of resistors connected in parallel to achieve the function of current limiting, and the first pre-charge capacitor C1 and the second pre-charge capacitor C2 may be a plurality of capacitors connected in series.

[0088] In some embodiments, further comprising a first diode D1, a second diode D2 and a third diode D3;

[0089] The anode of the first diode D1 is connected to the anode of the second diode D2, and the common end of the connections is connected to the first end of the starting resistor R, the cathode of the first diode D1 is connected to the second end of the starting resistor R, the cathode of the second diode D2 is connected to the anode of the third diode D3, and the common end of the connections is grounded, and the cathode of the third diode D3 is connected to the negative end of the DC bus;

[0090] The first diode D1 , the second diode D2 and the third diode D3 are all used for reverse protection.

[0091] Considering that the input of the second conversion module 3 is direct current and the output is still direct current, there is a possibility that current may flow from the direct current bus back to the direct current voltage source, so a diode is provided for reverse flow prevention.

[0092] Figure 3 It is a structural schematic diagram of a power supply system provided by the present invention, the power supply system comprises a DC bus and a plurality of the above-mentioned multi-power source integration devices, and the output end of each multi-power source integration device is connected to the DC bus.

[0093] In some embodiments, a battery 6 is also included;

[0094] The power supply end of the storage battery 6 is connected to the DC bus, and the communication end of the storage battery 6 is connected to the controller 1 in the multi-power source integration device;

[0095] The power supply end of the storage battery 6 is used to charge the DC bus with the voltage when the voltage on the DC bus meets the load demand, and to charge the DC bus when the voltage on the DC bus does not meet the load demand. The communication end of the storage battery 6 is used to send its own working state to the controller 1. The working state includes a combination of one or more of the battery power, battery temperature, charge and discharge current and charge and discharge voltage. The working state is related to the target DC bus voltage.

[0096] The controller 1 is specifically used for sending a voltage processing signal to the first conversion module 2 or the second conversion module 3 in the multi-power source integration device according to the working state.

[0097] Considering that the power supply of the DC voltage source and the AC voltage source may not be stable enough to meet the needs of the load, a battery 6 is set up. The battery 6 can be charged in addition to the DC bus meeting the load needs. If the DC bus is not enough to meet the needs of the load, the battery 6 supplements the power supply for the DC bus.

[0098] Furthermore, considering the influence of the working environment of the battery, it is necessary to adjust the bus voltage according to the power, temperature and characteristic curve of the battery 6; the controller 1 monitors the charging and discharging current of the battery 6, the external output current of the multi-power source integration device, and the output voltage of the multi-power source integration device, obtains the above parameters of other multi-power source integration devices according to the communication bus, regulates its own boost parameters, and adjusts the output current and voltage.

[0099] For an introduction to the power supply system provided in this application, please refer to the above embodiments and will not be repeated here.

[0100] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0101] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0102] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-power source integration device, characterized in that: include: A controller, wherein a first output end of the controller is connected to a control end of the first conversion module, a second output end of the controller is connected to a control end of the second conversion module, and the controller is used to send a voltage processing signal to the first conversion module or the second conversion module; The first conversion module, wherein the input end of the first conversion module is connected to the output end of the AC voltage source, the output end of the first conversion module is connected to the DC bus, and the first conversion module is used to convert the AC voltage input by the AC voltage source into a target DC bus voltage and then output it to the DC bus when receiving the voltage processing signal; The second conversion module, the input end of the second conversion module is connected to the output end of the DC voltage source, the output end of the second conversion module is connected to the output end of the first conversion module, and the second conversion module is used to convert the DC voltage input by the DC voltage source into the target DC bus voltage and output it to the DC bus when receiving the voltage processing signal.

2. The multi-power source integration device according to claim 1, characterized in that: Also includes a third conversion module and a fourth conversion module; The input end of the third conversion module and the input end of the fourth conversion module are connected to the DC bus, and the output end of the third conversion module and the output end of the fourth conversion module are both connected to the power supply end of the load; The third conversion module is used to step up or step down the target DC bus voltage on the DC bus to supply power to the load; The third conversion module is used to step up or down the target DC bus voltage on the DC bus and convert it into AC power to supply power to the load.

3. The multi-power source integration device as claimed in claim 1, characterized in that: The first conversion module includes a rectifier bridge and a first disconnect switch; The output positive terminal of the AC voltage source is connected to the first terminal of the first disconnect switch, the second terminal of the first disconnect switch is connected to the input positive terminal of the rectifier bridge, the control terminal of the first disconnect switch is connected to the controller, the output negative terminal of the AC voltage source is connected to the input negative terminal of the rectifier bridge, the output positive terminal of the rectifier bridge is connected to the positive terminal of the DC bus, and the output negative terminal of the rectifier bridge is connected to the negative terminal of the DC bus; The controller is also used to control the first disconnect switch to be disconnected so that the first conversion module stops converting the AC voltage into a DC voltage, and the rectifier bridge is used to convert the AC voltage output by the AC voltage source into a DC voltage and boost the voltage.

4. The multi-power source integration device as claimed in claim 3, characterized in that: The first conversion module includes an anti-reverse module, a boost module and a second cut-off switch; The output positive end of the DC voltage source is connected to the first end of the second disconnect switch, the second end of the second disconnect switch is connected to the input positive end of the anti-reverse module, the control end of the second disconnect switch is connected to the controller, the output negative end of the DC voltage source is connected to the input negative end of the anti-reverse module, the output positive end of the anti-reverse module is connected to the input positive end of the boost module, the output negative end of the anti-reverse module is connected to the input negative end of the boost module, the output positive end of the boost module is connected to the positive end of the DC bus, and the output negative end of the boost module is connected to the negative end of the DC bus; The controller is also used to control the second disconnect switch to disconnect so that the second conversion module stops boosting the DC voltage. The anti-reverse module is used to prevent the voltage of the DC bus from flowing into the DC voltage source. The boost module is used to boost the DC voltage output by the DC voltage source.

5. The multi-power source integration device as claimed in claim 4, characterized in that: Also includes a first current sensor, a second current sensor and a third current sensor; The first current sensor is arranged between the input end of the first conversion module and the output end of the AC voltage source, and is used to detect the output current of the AC voltage source; The second current sensor is arranged between the input end of the second conversion module and the output end of the DC voltage source, and is used to detect the output current of the AC voltage source; The third current sensor is arranged at a common end connected to the output end of the second conversion module and the output end of the first conversion module, and is used to detect the current output to the DC bus; The controller is specifically used to send a voltage processing signal to the first conversion module or the second conversion module, and control the first disconnect switch and / or the second disconnect switch to disconnect according to the output current of the AC voltage source, the output current of the AC voltage source and the current output to the DC bus.

6. The multi-power source integration device as claimed in claim 1, characterized in that: The number of the first conversion module and the number of the second conversion module are both multiple; The control end of each first conversion module is connected to the first output end of the controller, the input end of each first conversion module is connected to an AC voltage source, the output positive ends of the plurality of first conversion modules are connected, and the common end of the connections is connected to the positive end of the DC bus; The control end of each second conversion module is connected to the second output end of the controller, the input end of each second conversion module is connected to a DC voltage source, the output positive ends of multiple second conversion modules are connected, and the common end of the connections is connected to the positive end of the DC bus.

7. The multi-power source integration device according to any one of claims 1 to 6, characterized in that: It also includes a starting resistor, a first pre-charge capacitor and a second pre-charge capacitor; The first end of the starting resistor is connected to the positive end of the DC bus, the second end of the pre-charge group is connected to the first end of the first pre-charge capacitor and the first end of the second pre-charge capacitor, and the second end of the first pre-charge capacitor and the second end of the second pre-charge capacitor are both connected to the negative electrode of the DC bus; The controller is also used to pre-control the DC bus to charge the first pre-charge capacitor and the second pre-charge capacitor through the starting resistor.

8. The multi-power source integration device as claimed in claim 7, characterized in that: Also includes a first diode, a second diode and a third diode; The anode of the first diode is connected to the anode of the second diode, and the common end of the connections is connected to the first end of the starting resistor, the cathode of the first diode is connected to the second end of the starting resistor, the cathode of the second diode is connected to the anode of the third diode, and the common end of the connections is grounded, and the cathode of the third diode is connected to the negative end of the DC bus; The first diode, the second diode and the third diode are all used for reverse protection.

9. A power supply system, characterized in that: It comprises a DC bus and a plurality of multi-power source integration devices as claimed in any one of claims 1 to 8, wherein the output end of each of the multi-power source integration devices is connected to the DC bus.

10. The power supply system according to claim 9, characterized in that: Also includes batteries; The power supply end of the storage battery is connected to the DC bus, and the communication end of the storage battery is connected to the controller in the multi-power source integration device; The power supply end of the storage battery is used to charge the DC bus with the voltage on the DC bus when the voltage on the DC bus meets the load demand, and to charge the DC bus when the voltage on the DC bus does not meet the load demand. The communication end of the storage battery is used to send its own working state to the controller, and the working state includes a combination of one or more of the battery power, battery temperature, charge and discharge current and charge and discharge voltage, and the working state is related to the target DC bus voltage; The controller is specifically configured to send a voltage processing signal to a first conversion module or a second conversion module in the multi-power source integration device according to the working state.

Images