Flexible AC / DC hybrid power supply system

Abstract

The invention, which relates to the technical field of hybrid power supply, discloses a flexible AC / DC hybrid power supply system comprising an AC power supply module used for power supply and electric energy processing; the voltage transformation compensation module is used for voltage compensation and voltage transformation; the photovoltaic conversion module is used for photoelectric conversion, electric energy conversion, electric energy superposition and providing compensation electric energy; the direct current control module is used for electric energy conversion and voltage compensation; the transmission control module is used for controlling an electric energy transmission path and supplying power to the alternating current bus module to obtain the transformation compensation module; the energy storage control module is used for energy storage and discharge control; the alternating-current bus module is used for electric energy gathering and power distribution; the photovoltaic detection module is used for setting a low-voltage threshold value and a high-voltage threshold value and carrying out voltage detection; the energy storage detection module is used for setting a low-power threshold value and a full-power threshold value, carrying out electric quantity detection and judging a power supply state; and the central control module is used for signal receiving and module control. The flexible alternating-current and direct-current hybrid power supply system can improve the energy utilization rate and the power supply stability.

Description

Technical Field

[0001] The invention relates to the technical field of hybrid power supply, and in particular to a flexible AC / DC hybrid power supply system. Background Art

[0002] A flexible AC / DC hybrid power supply system is a power supply method that combines flexible DC transmission technology with an AC power grid. It uses a voltage source converter to achieve flexible conversion and control between AC and DC to meet the needs of different loads. Flexible AC / DC hybrid power supply systems in the prior art generally use DC power supply systems, photovoltaic power supply systems, AC power supply systems and other power supply systems for hybrid power supply. However, since the photovoltaic power supply system is easily affected by sunlight, there is an unstable power supply situation and the converted electric energy cannot be fully utilized. In addition, the DC power supply system or the AC power supply system may become unstable when supplying power, resulting in a voltage drop in the AC power grid. Therefore, there is room for improvement. Summary of the invention

[0003] The embodiment of the present invention provides a flexible AC / DC hybrid power supply system to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a flexible AC / DC hybrid power supply system is provided, comprising: an AC power supply module, a voltage transformation compensation module, a DC control module, a photovoltaic conversion module, a transmission control module, an AC bus module, an energy storage control module, a photovoltaic detection module, an energy storage detection module and a central control module;

[0005] The AC power supply module is used to receive AC power and perform rectification, filtering and inversion processing to output the first electric energy;

[0006] a voltage transformation and compensation module, connected to the AC power supply module and the transmission control module, and configured to perform voltage compensation on the first electric energy, transform the first electric energy and output the third electric energy when receiving the sixth electric energy transmitted by the transmission control module;

[0007] A photovoltaic conversion module, connected to the central control module and the energy storage control module, for performing photoelectric conversion and voltage regulation and outputting a fifth electric energy, superimposing the fifth electric energy with the second electric energy provided by the energy storage control module and outputting a seventh electric energy upon receiving a second pulse signal output by the central control module, filtering and inverting the fifth electric energy or the second electric energy output by the energy storage control module and outputting a sixth electric energy;

[0008] A DC control module is connected to the central control module, the photovoltaic conversion module and the AC bus module, and is used to filter, invert and isolate the first DC power energy received and output the fourth power energy, receive the fifth power energy and perform voltage compensation on the first DC power energy when receiving the first pulse signal output by the central control module, and perform rectification and filtering on the eighth power energy output by the AC bus module and provide the second DC power energy;

[0009] A transmission control module, connected to the photovoltaic conversion module and the central control module, and used to transmit the sixth electric energy to the AC bus module, and when receiving the first control signal output by the central control module, transmit the sixth electric energy to the voltage transformation compensation module;

[0010] an energy storage control module, connected to the central control module, and configured to store the fifth electric energy when receiving a charging signal output by the central control module, provide the second electric energy when receiving a discharging signal output by the central control module, and transmit the second electric energy to the photovoltaic conversion module when receiving a second pulse signal output by the central control module;

[0011] an AC bus module, connected to the transmission control module and the voltage transformation compensation module, and configured to receive the fourth electric energy, the sixth electric energy and the third electric energy, and provide the eighth electric energy;

[0012] A photovoltaic detection module, connected to the photovoltaic conversion module, used to set a low voltage threshold and a high voltage threshold, output a first high level signal when the fifth electric energy is lower than the low voltage threshold, and output a second high level signal when the fifth electric energy is higher than the high voltage threshold;

[0013] an energy storage detection module, connected to the energy storage control module, and used to set a low power threshold and a full power threshold, output a third high level signal when the second power is lower than the low power threshold, output a fourth high level signal when the second power is higher than the full power threshold, and output a fifth high level signal when the third high level signal is output and the first high level signal is received;

[0014] The central control module is connected to the photovoltaic detection module and the energy storage detection module, and is used to output a first pulse signal when the second high level signal and the first high level signal are not received, output a discharge signal and a first control signal when the first high level signal, the second high level signal, the third high level signal and the fourth high level signal are not received, output a discharge signal when the fourth high level signal is received, output a charging signal when the second high level signal is received, and maintain the output state of the first pulse signal and output a second pulse signal when the fifth high level signal is received.

[0015] As a further solution of the present invention: the DC control module includes a DC bus terminal, a first capacitor, a first unipolar transistor, a second unipolar transistor, a first resistor, a bidirectional converter, a first inductor and a first isolation transformer; the AC bus module includes an AC bus terminal; the central control module includes an intelligent controller;

[0016] Preferably, the first end of the DC bus terminal is connected to the first end of the bidirectional converter and is connected to the drain of the first unipolar transistor and the source of the second unipolar transistor through the first capacitor, the gate of the first unipolar transistor is connected to the IO3 end of the intelligent controller and the gate of the second unipolar transistor and is connected to the second end of the DC bus terminal and the second end of the bidirectional converter through the first resistor, the third end of the bidirectional converter is connected to the first end of the primary side of the first isolation transformer through the first inductor, the second end of the primary side of the first isolation transformer is connected to the fourth end of the bidirectional converter, the first end and the second end of the secondary side of the first isolation transformer are respectively connected to the first end and the second end of the AC bus terminal, and the drain of the second unipolar transistor is connected to the photovoltaic conversion module.

[0017] As a further solution of the present invention: the photovoltaic conversion module includes a photovoltaic power generation source, a DC voltage stabilizer, a second capacitor, a first diode, a third unipolar transistor, a second resistor, a third capacitor, a second diode and a first inverter;

[0018] Preferably, the first end and the second end of the photovoltaic power generation source are respectively connected to the first end and the second end of the DC regulator, the third end of the DC regulator is connected to the anode of the first diode and is connected to the source of the third unipolar transistor through the second capacitor, the cathode of the second diode is connected to the first end of the first inverter, the cathode of the first diode is connected to the anode of the second diode and is connected to the drain of the second unipolar transistor and is connected to one end of the second resistor, the drain of the third unipolar transistor, the fourth end of the second rectifier and the second end of the first inverter through the third capacitor, the other end of the second resistor is connected to the gate of the third unipolar transistor and the IO2 end of the intelligent controller, and the third and fourth ends of the first inverter are connected to the transmission control module.

[0019] As a further solution of the present invention: the energy storage control module includes a fourth unipolar transistor, a fifth unipolar transistor, a sixth unipolar transistor, a fourth capacitor and an energy storage device;

[0020] Preferably, the source of the fourth unipolar transistor is connected to the source of the third unipolar transistor, the drain of the fourth unipolar transistor is connected to the drain of the sixth unipolar transistor and the drain of the fifth unipolar transistor and is connected to the second end of the energy storage device and the second end of the first inverter through the fourth capacitor, the source of the sixth unipolar transistor is connected to the first end of the energy storage device, the source of the fifth unipolar transistor is connected to the cathode of the second diode, and the gate of the fourth unipolar transistor, the gate of the fifth unipolar transistor and the gate of the sixth unipolar transistor are respectively connected to the IO2 end, IO1 end and IO5 end of the intelligent controller.

[0021] As a further solution of the present invention: the voltage transformation compensation module includes a second isolation transformer and a third isolation transformer;

[0022] Preferably, the first end and the second end of the primary side of the second isolation transformer are respectively connected to the first end and the second end of the AC bus terminal, the first end of the secondary side of the second isolation transformer is connected to the second end of the secondary side of the third isolation transformer, the first end of the secondary side of the third isolation transformer and the second end of the secondary side of the second isolation transformer are connected to the AC power supply module, and the first end and the second end of the primary side of the third isolation transformer are connected to the transmission control module.

[0023] As a further solution of the present invention: the AC power supply module includes an AC power source, a fifth capacitor, a single-phase rectifier and a second inverter;

[0024] Preferably, the first end of the AC power supply is connected to the first end of the single-phase rectifier and the second end of the single-phase rectifier and the second end of the AC power supply are connected through a fifth capacitor, the third end and the fourth end of the single-phase rectifier are respectively connected to the first end and the second end of the second inverter, and the third end and the fourth end of the second inverter are respectively connected to the first end of the secondary side of the third isolation transformer and the second end of the secondary side of the second isolation transformer.

[0025] As a further solution of the present invention: the transmission control module includes a third resistor, a first thyristor, a second thyristor, a third thyristor and a first switch tube;

[0026] Preferably, the control end of the first thyristor is connected to the control end of the second thyristor and the collector of the first switch tube and is connected to the first end of the first inverter through a third resistor, one end of the first thyristor is connected to one end of the third thyristor and the third end of the first inverter, one end of the second thyristor is connected to the fourth end of the first inverter and the second end of the secondary side of the second isolation transformer, the other end of the third thyristor is connected to the first end of the secondary side of the second isolation transformer, the other end of the first thyristor and the other end of the second thyristor are connected to the first end and the second end of the AC bus terminal respectively, the control end of the third thyristor is connected to the base of the first switch tube and the IO4 terminal of the intelligent controller, and the emitter of the first switch tube is grounded.

[0027] As a further solution of the present invention: the photovoltaic detection module includes a fourth resistor, a fifth resistor, a first detection device and a second detection device;

[0028] Preferably, the input end of the high-end detection device is connected to the input end of the second detection device and one end of the fifth resistor and is connected to the third end of the DC regulator through the fourth resistor, the other end of the fifth resistor is connected to the fourth end of the DC regulator, and the output end of the high-voltage device and the output end of the second detection device are respectively connected to the IO10 end and IO6 end of the intelligent controller.

[0029] As a further solution of the present invention: the energy storage detection module includes a seventh resistor, a sixth resistor, a third detection device and a fourth detection device;

[0030] Preferably, the input end of the third detection device is connected to the input end of the fourth detection device and one end of the sixth resistor and is connected to the first end of the energy storage device through the seventh resistor, the other end of the sixth resistor is connected to the second end of the energy storage device, and the output end of the third detection device and the output end of the fourth detection device are respectively connected to the IO7 end and IO8 end of the intelligent controller.

[0031] As a further solution of the present invention: the energy storage detection module also includes a gate logic device;

[0032] Preferably, the A end and the B end of the gate logic device are connected to the output end of the second detection device and the output end of the fourth detection device respectively, and the Y end of the gate logic device is connected to the IO9 end of the intelligent controller.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the flexible AC / DC hybrid power supply system of the present invention can aggregate the electric energy output by the DC control module, the photovoltaic conversion module and the transformer compensation module through the AC bus module, the energy storage control module stores the electric energy provided by the photovoltaic conversion module, the photovoltaic detection module detects the electric energy voltage state provided by the photovoltaic conversion module, the energy storage detection module detects the electric energy voltage state provided by the energy storage control module, and then the central control module controls the photovoltaic conversion module and the energy storage control module to supply power or performs voltage compensation control on the DC control module and the transformer compensation module according to the detected electric energy voltage state, thereby improving energy utilization and improving power supply stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0035] Figure 1 A schematic block diagram of the principles of a flexible AC / DC hybrid power supply system provided in an embodiment of the present invention.

[0036] Figure 2 A circuit diagram of a flexible AC / DC hybrid power supply system provided in an embodiment of the present invention.

[0037] Figure 3 A circuit diagram of an AC power supply module provided in an embodiment of the present invention.

[0038] Figure 4 A circuit diagram of a transmission control module provided in an embodiment of the present invention.

[0039] Figure 5 A circuit diagram of a photovoltaic detection module provided in an embodiment of the present invention.

[0040] Figure 6 A circuit diagram of an energy storage control module provided in an embodiment of the present invention.

[0041] Figure 7 Another circuit diagram of the energy storage control module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0043] In one embodiment, see Figure 1 , a flexible AC / DC hybrid power supply system, comprising: an AC power supply module 1, a transformer compensation module 2, a DC control module 3, a photovoltaic conversion module 4, a transmission control module 5, an AC bus module 6, an energy storage control module 7, a photovoltaic detection module 8, an energy storage detection module 9 and a central control module 10;

[0044] Specifically, the AC power supply module 1 is used to receive AC power and perform rectification, filtering and inversion processing to output the first electric energy;

[0045] The voltage transformation and compensation module 2 is connected to the AC power supply module 1 and the transmission control module 5, and is used to perform voltage compensation on the first electric energy when receiving the sixth electric energy transmitted by the transmission control module 5, transform the first electric energy and output the third electric energy;

[0046] The photovoltaic conversion module 4 is connected to the central control module 10 and the energy storage control module 7, and is used to perform photoelectric conversion and voltage regulation and output the fifth electric energy. When receiving the second pulse signal output by the central control module 10, the fifth electric energy is superimposed with the second electric energy provided by the energy storage control module 7 and the seventh electric energy is output. The fifth electric energy or the second electric energy output by the energy storage control module 7 is filtered and inverted and the sixth electric energy is output.

[0047] The DC control module 3 is connected to the central control module 10, the photovoltaic conversion module 4 and the AC bus module 6, and is used to filter, invert and isolate the first DC power and output the fourth power. When receiving the first pulse signal output by the central control module 10, it receives the fifth power and performs voltage compensation on the first DC power, and performs rectification and filtering on the eighth power output by the AC bus module 6 and provides the second DC power.

[0048] The transmission control module 5 is connected to the photovoltaic conversion module 4 and the central control module 10, and is used to transmit the sixth electric energy to the AC bus module 6, and when receiving the first control signal output by the central control module 10, transmit the sixth electric energy to the voltage transformation compensation module 2;

[0049] The energy storage control module 7 is connected to the central control module 10, and is used to store the fifth electric energy when receiving the charging signal output by the central control module 10, provide the second electric energy when receiving the discharging signal output by the central control module 10, and transmit the second electric energy to the photovoltaic conversion module 4 when receiving the second pulse signal output by the central control module 10;

[0050] an AC bus module 6, connected to the transmission control module 5 and the voltage transformation compensation module 2, for receiving the fourth electric energy, the sixth electric energy and the third electric energy, and providing the eighth electric energy;

[0051] The photovoltaic detection module 8 is connected to the photovoltaic conversion module 4 and is used to set a low voltage threshold and a high voltage threshold, and output a first high level signal when the fifth electric energy is lower than the low voltage threshold, and output a second high level signal when the fifth electric energy is higher than the high voltage threshold;

[0052] An energy storage detection module 9 is connected to the energy storage control module 7, and is used to set a low power threshold and a full power threshold. When the second power is lower than the low power threshold, a third high level signal is output, and when the second power is higher than the full power threshold, a fourth high level signal is output. When the third high level signal is output and the first high level signal is received, a fifth high level signal is output;

[0053] The central control module 10 is connected to the photovoltaic detection module 8 and the energy storage detection module 9, and is used to output a first pulse signal when the second high level signal and the first high level signal are not received, output a discharge signal and a first control signal when the first high level signal, the second high level signal, the third high level signal and the fourth high level signal are not received, output a discharge signal when the fourth high level signal is received, output a charging signal when the second high level signal is received, and maintain the output state of the first pulse signal and output a second pulse signal when the fifth high level signal is received.

[0054] In a specific embodiment, the AC power supply module 1 can use an AC power supply circuit composed of an AC power supply, a rectifier, an inverter, etc. to perform AC-DC and DC-AC regulation on the connected AC power; the transformer compensation module 2 can sample the transformer compensation circuit composed of an isolation transformer to perform AC-AC regulation and power compensation control; the DC control module 3 can use a DC control circuit composed of a DC bus terminal, an inverter, an isolation transformer, a field effect transistor, etc. to achieve DC-AC and AC-AC regulation and perform power compensation control with the photovoltaic conversion module 4; the photovoltaic conversion module 4 can use a photovoltaic conversion circuit composed of a photovoltaic power source, a voltage stabilizer, an inverter, etc. to perform photoelectric conversion, DC-DC and DC-AC regulation, and control the power superposition work with the energy storage control module 7; the transmission control module 5 can use a transmission control circuit composed of a thyristor, a triode and a resistor to control the power transmission path, and realize it as an AC bus module 6 Or power supply of the transformer compensation module 2; the above-mentioned AC bus module 6 can adopt the AC bus circuit composed of the AC bus end to aggregate and distribute electric energy; the above-mentioned energy storage control module 7 can adopt the energy storage control circuit composed of energy storage device, field effect tube, and capacitor to control energy storage and discharge and control the energy transmission path; the above-mentioned photovoltaic detection module 8 can adopt the first detection device composed of a resistor, a first detection device and a second detection device, which can set the high voltage threshold and the low voltage threshold, and then perform voltage judgment; the above-mentioned energy storage detection module 9 can adopt the energy storage detection circuit composed of a resistor, a third detection device and a fourth detection device, set the full power threshold and the low power threshold, and perform full power detection and low power detection on the energy storage control module 7; the above-mentioned central control module 10 can adopt the central control circuit composed of a single-chip microcomputer, which integrates many components such as an operator, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions.

[0055] In another embodiment, see Figure 1 and Figure 2The DC control module 3 includes a DC bus terminal, a first capacitor C1, a first unipolar transistor Q1, a second unipolar transistor Q2, a first resistor R1, a bidirectional converter T1, a first inductor L1 and a first isolation transformer B1; the AC bus module 6 includes an AC bus terminal; the central control module 10 includes an intelligent controller U1;

[0056] Specifically, the first end of the DC bus terminal is connected to the first end of the bidirectional converter T1 and is connected to the drain of the first unipolar transistor Q1 and the source of the second unipolar transistor Q2 through the first capacitor C1, the gate of the first unipolar transistor Q1 is connected to the IO3 end of the intelligent controller U1 and the gate of the second unipolar transistor Q2 and is connected to the second end of the DC bus terminal and the second end of the bidirectional converter T1 through the first resistor R1, the third end of the bidirectional converter T1 is connected to the first end of the primary side of the first isolation transformer B1 through the first inductor L1, the second end of the primary side of the first isolation transformer B1 is connected to the fourth end of the bidirectional converter T1, the first end and the second end of the secondary side of the first isolation transformer B1 are respectively connected to the first end and the second end of the AC bus terminal, and the drain of the second unipolar transistor Q2 is connected to the photovoltaic conversion module 4.

[0057] In a specific embodiment, the first unipolar transistor Q1 can be a P-channel field effect transistor, and the second unipolar transistor Q2 can be an N-channel field effect transistor, wherein the first unipolar transistor Q1 controls the first capacitor C1 to filter the electric energy provided by the DC bus terminal, and the second unipolar transistor Q2 controls the photovoltaic conversion module 4 to perform voltage compensation on the electric energy provided by the DC bus terminal; the bidirectional converter T1 can be composed of four groups of IGBTs and four groups of diodes to perform DC-AC conversion and AC-DC conversion; the first isolation transformer B1 can be a high-frequency isolation transformer; the intelligent controller U1 can be an STM32 microcontroller.

[0058] Further, the photovoltaic conversion module 4 includes a photovoltaic power source, a DC voltage regulator T5, a second capacitor C2, a first diode D1, a third unipolar transistor Q3, a second resistor R2, a third capacitor C3, a second diode D2 and a first inverter T2;

[0059] Specifically, the first end and the second end of the photovoltaic power generation source are respectively connected to the first end and the second end of the DC regulator T5, the third end of the DC regulator T5 is connected to the anode of the first diode D1 and is connected to the source of the third unipolar transistor Q3 through the second capacitor C2, the cathode of the second diode D2 is connected to the first end of the first inverter T2, the cathode of the first diode D1 is connected to the anode of the second diode D2 and is connected to the drain of the second unipolar transistor Q2 through the third capacitor C3. One end of the second resistor R2, the drain of the third unipolar transistor Q3, the fourth end of the second rectifier and the second end of the first inverter T2, the other end of the second resistor R2 is connected to the gate of the third unipolar transistor Q3 and the IO2 end of the intelligent controller U1, and the third and fourth ends of the first inverter T2 are connected to the transmission control module 5.

[0060] In a specific embodiment, the DC regulator T5 may be composed of a boost circuit; the third unipolar transistor Q3 may be a P-channel field effect transistor to control the second capacitor C2 to filter the electric energy provided by the photovoltaic power generation source; the first inverter T2 may be composed of four groups of IGBTs to perform DC-AC conversion.

[0061] Further, the energy storage control module 7 includes a fourth unipolar transistor Q4, a fifth unipolar transistor Q5, a sixth unipolar transistor Q6, a fourth capacitor C4 and an energy storage device;

[0062] Specifically, the source of the fourth unipolar transistor Q4 is connected to the source of the third unipolar transistor Q3, the drain of the fourth unipolar transistor Q4 is connected to the drain of the sixth unipolar transistor Q6 and the drain of the fifth unipolar transistor Q5 and is connected to the second end of the energy storage device and the second end of the first inverter T2 through the fourth capacitor C4, the source of the sixth unipolar transistor Q6 is connected to the first end of the energy storage device, the source of the fifth unipolar transistor Q5 is connected to the cathode of the second diode D2, and the gate of the fourth unipolar transistor Q4, the gate of the fifth unipolar transistor Q5 and the gate of the sixth unipolar transistor Q6 are respectively connected to the IO2 end, the IO1 end and the IO5 end of the intelligent controller U1.

[0063] In a specific embodiment, the fourth unipolar transistor Q4, the fifth unipolar transistor Q5 and the sixth unipolar transistor Q6 can all be N-channel field effect transistors, wherein the fourth unipolar transistor Q4 performs compensation control, the fifth unipolar transistor Q5 performs discharge control, and the sixth unipolar transistor Q6 detects energy storage control; the energy storage device can first use a battery.

[0064] Further, the voltage transformation compensation module 2 includes a second isolation transformer B2 and a third isolation transformer B3;

[0065] Specifically, the first end and the second end of the primary side of the second isolation transformer B2 are respectively connected to the first end and the second end of the AC bus end, the first end of the secondary side of the second isolation transformer B2 is connected to the second end of the secondary side of the third isolation transformer B3, the first end of the secondary side of the third isolation transformer B3 and the second end of the secondary side of the second isolation transformer B2 are connected to the AC power supply module 1, and the first end and the second end of the primary side of the third isolation transformer B3 are connected to the transmission control module 5.

[0066] In a specific embodiment, the second isolation transformer B2 may be a high-frequency isolation transformer; and the third isolation transformer B3 may be a coupling isolation transformer.

[0067] In another embodiment, see Figure 1 , Figure 3 and Figure 4 , the AC power supply module 1 includes an AC power source, a fifth capacitor C5, a single-phase rectifier T4 and a second inverter T3;

[0068] Specifically, the first end of the AC power supply is connected to the first end of the single-phase rectifier T4 and connected to the second end of the single-phase rectifier T4 and the second end of the AC power supply through the fifth capacitor C5, the third end and the fourth end of the single-phase rectifier T4 are respectively connected to the first end and the second end of the second inverter T3, and the third end and the fourth end of the second inverter T3 are respectively connected to the first end of the secondary side of the third isolation transformer B3 and the second end of the secondary side of the second isolation transformer B2.

[0069] In a specific embodiment, the second inverter T3 may be composed of four groups of IGBTs to perform DC-AC conversion.

[0070] Further, the transmission control module 5 includes a third resistor R3, a first thyristor S1, a second thyristor S2, a third thyristor S3 and a first switch tube V1;

[0071] Specifically, the control end of the first thyristor S1 is connected to the control end of the second thyristor S2 and the collector of the first switch tube V1 and is connected to the first end of the first inverter T2 through the third resistor R3, one end of the first thyristor S1 is connected to one end of the third thyristor S3 and the third end of the first inverter T2, one end of the second thyristor S2 is connected to the fourth end of the first inverter T2 and the second end of the secondary side of the second isolation transformer B2, the other end of the third thyristor S3 is connected to the first end of the secondary side of the second isolation transformer B2, the other end of the first thyristor S1 and the other end of the second thyristor S2 are connected to the first end and the second end of the AC bus terminal respectively, the control end of the third thyristor S3 is connected to the base of the first switch tube V1 and the IO4 terminal of the intelligent controller U1, and the emitter of the first switch tube V1 is grounded.

[0072] In a specific embodiment, the first thyristor S1, the second thyristor S2 and the third thyristor S3 can all be bidirectional thyristors, wherein the first thyristor S1 and the second thyristor S2 control the transmission of electric energy to the AC bus terminal, and the third thyristor S3 controls the transmission of electric energy to the transformer compensation module 2; the first switch tube V1 can be an NPN transistor.

[0073] In another embodiment, see Figure 1 , Figure 5 , Figure 6 and Figure 7 , the photovoltaic detection module 8 includes a fourth resistor R4, a fifth resistor R5, a first detection device and a second detection device;

[0074] Specifically, the input end of the high-end detection device is connected to the input end of the second detection device and one end of the fifth resistor R5 and is connected to the third end of the DC regulator T5 through the fourth resistor R4. The other end of the fifth resistor R5 is connected to the fourth end of the DC regulator T5. The output end of the high-voltage device and the output end of the second detection device are respectively connected to the IO10 end and IO6 end of the intelligent controller U1.

[0075] In a specific embodiment, the fourth resistor R4 and the fifth resistor R5 perform voltage sampling; the first detection device may be composed of a comparator and a reference source, and a high voltage threshold may be set, and a high voltage judgment may be performed; the second detection device may be composed of a comparator and a reference source, and a low voltage threshold may be set, and a low voltage judgment may be performed.

[0076] Further, the energy storage detection module 9 includes a seventh resistor R7, a sixth resistor R6, a third detection device and a fourth detection device;

[0077] Specifically, the input end of the third detection device is connected to the input end of the fourth detection device and one end of the sixth resistor R6 and is connected to the first end of the energy storage device through the seventh resistor R7, the other end of the sixth resistor R6 is connected to the second end of the energy storage device, and the output end of the third detection device and the output end of the fourth detection device are respectively connected to the IO7 end and IO8 end of the intelligent controller U1.

[0078] In a specific embodiment, the seventh resistor R7 and the sixth resistor R6 are used for power sampling; the third detection device may be composed of a comparator and a reference source, and a full power threshold may be set, and a full power judgment may be performed; the fourth detection device may be composed of a comparator and a reference source, and a low power threshold may be set, and a low power judgment may be performed.

[0079] Furthermore, the energy storage detection module 9 also includes a gate logic device U2;

[0080] Specifically, the A terminal and the B terminal of the gate logic device U2 are connected to the output terminal of the second detection device and the output terminal of the fourth detection device respectively, and the Y terminal of the gate logic device U2 is connected to the IO9 terminal of the intelligent controller U1.

[0081] In a specific embodiment, the gate logic device U2 may be an AND gate chip.

[0082] In a flexible AC / DC hybrid power supply system of the present embodiment, a first DC power can be provided by a DC bus terminal, a first unipolar transistor Q1 is turned on, a first capacitor C1 performs filtering, and then a bidirectional converter T1 performs inversion regulation, a first isolation transformer B1 and a first inductor L1 perform isolation and voltage transformation processing, output a fourth power and transmit the fourth power to an AC bus terminal, an AC power supply provides AC power, a fifth capacitor C5, a single-phase rectifier T4 and a second inverter T3 perform rectification, filtering and inversion regulation and output the first power, the first power is transformed by a second isolation transformer B2 and transmitted to the AC bus terminal, a photovoltaic power source performs photoelectric conversion, a DC voltage regulator T5 performs voltage regulation and outputs the fifth power, and a third unipolar transistor Q3 is turned on and filtered by the second capacitor C2. The fourth resistor R4 and the fifth resistor R5 perform voltage sampling. When the sampled signal is greater than the high-voltage threshold set by the first detection device, the first inverter T2 performs inversion regulation and outputs the sixth electric energy. At the same time, the IO5 terminal of the intelligent controller U1 outputs a charging signal and triggers the sixth unipolar transistor Q6 to turn on. The energy storage device stores energy, and the first thyristor S1 and the second thyristor S2 are turned on to transmit the sixth electric energy to the AC bus terminal. When the sampled signal is not greater than the high-voltage threshold, the IO3 terminal of the intelligent controller U1 outputs a first pulse signal, and the second unipolar transistor Q2 is turned on, so that the fifth electric energy is transmitted to the first capacitor C1 through the second unipolar transistor Q2, and the DC The bus terminal performs electric energy compensation to improve the power supply stability of the DC bus terminal. The seventh resistor R7 and the sixth resistor R6 detect the power of the energy storage device. When the detected signal is greater than the full power threshold set by the full power threshold device, the IO1 terminal of the intelligent controller U1 outputs a discharge signal and controls the fifth unipolar transistor Q5 to be turned on, providing the second electric energy and after being processed by the first inverter T2, it is transmitted to the AC bus terminal through the transmission control module 5. If the power of the energy storage device is less than the full power threshold and greater than the low power threshold set by the fourth detection device, the voltage of the photovoltaic power supply is less than the high voltage threshold and greater than the low voltage threshold, the IO4 terminal and IO1 terminal of the intelligent controller U1 respectively output the first control signal and the discharge signal to control the first switch tube V1 and the first switch tube V2. The three thyristors S3 are turned on, so that the electric energy released by the energy storage device is transmitted to the third isolation transformer B3 through the third thyristor S3 after being inverted, and voltage compensation is performed on the electric energy output by the AC power supply module 1 to improve the power supply stability of the AC power supply module 1. If the power of the energy storage device is lower than the low power threshold and the voltage of the photovoltaic power generation source is lower than the low voltage threshold, the Y end of the gate logic device U2 outputs a high level, the IO2 end of the intelligent controller U1 outputs a second pulse signal and controls the fourth unipolar transistor Q4 to be turned on, and the IO3 end of the intelligent controller U1 maintains the second unipolar transistor Q2 to be turned on, so that the photovoltaic power generation source and the energy storage device are superimposed on electric energy, and the superimposed electric energy is the electric energy provided by the DC bus terminal for voltage compensation processing.Improve the power utilization rate of the photovoltaic conversion module 4 and the energy storage control module 7, and because the bidirectional converter T1 can perform rectification processing, the eighth power provided by the AC bus terminal can be rectified and then power the DC bus terminal.

[0083] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0084] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flexible AC / DC hybrid power supply system, characterized in that: The flexible AC / DC hybrid power supply system includes: an AC power supply module, a voltage transformation compensation module, a DC control module, a photovoltaic conversion module, a transmission control module, an AC bus module, an energy storage control module, a photovoltaic detection module, an energy storage detection module and a central control module; The AC power supply module is used to receive AC power and perform rectification, filtering and inversion processing to output the first electric energy; The voltage transformation compensation module is connected to the AC power supply module and the transmission control module, and is used to perform voltage compensation on the first electric energy, transform the first electric energy and output the third electric energy when receiving the sixth electric energy transmitted by the transmission control module; The photovoltaic conversion module is connected to the central control module and the energy storage control module, and is used to perform photoelectric conversion and voltage regulation and output the fifth electric energy. When receiving the second pulse signal output by the central control module, the fifth electric energy is superimposed with the second electric energy provided by the energy storage control module and the seventh electric energy is output, and the fifth electric energy or the second electric energy output by the energy storage control module is filtered and inverted and the sixth electric energy is output; The DC control module is connected to the central control module, the photovoltaic conversion module and the AC bus module, and is used to filter, invert and isolate the first DC power and output the fourth power. When receiving the first pulse signal output by the central control module, the DC control module receives the fifth power and performs voltage compensation on the first DC power, and performs rectification and filtering on the eighth power output by the AC bus module and provides the second DC power. The transmission control module is connected to the photovoltaic conversion module and the central control module, and is used to transmit the sixth electric energy to the AC bus module, and when receiving the first control signal output by the central control module, transmit the sixth electric energy to the voltage transformation compensation module; The energy storage control module is connected to the central control module and is used to store the fifth electric energy when receiving the charging signal output by the central control module, provide the second electric energy when receiving the discharging signal output by the central control module, and transmit the second electric energy to the photovoltaic conversion module when receiving the second pulse signal output by the central control module; The AC bus module is connected to the transmission control module and the voltage transformation compensation module, and is used to receive the fourth electric energy, the sixth electric energy and the third electric energy, and provide the eighth electric energy; The photovoltaic detection module is connected to the photovoltaic conversion module and is used to set a low voltage threshold and a high voltage threshold, and outputs a first high level signal when the fifth electric energy is lower than the low voltage threshold, and outputs a second high level signal when the fifth electric energy is higher than the high voltage threshold; The energy storage detection module is connected to the energy storage control module, and is used to set a low power threshold and a full power threshold, and outputs a third high level signal when the second power is lower than the low power threshold, and outputs a fourth high level signal when the second power is higher than the full power threshold, and outputs a fifth high level signal when the third high level signal is output and the first high level signal is received; The central control module is connected to the photovoltaic detection module and the energy storage detection module, and is used to output a first pulse signal when the second high level signal and the first high level signal are not received, output a discharge signal and a first control signal when the first high level signal, the second high level signal, the third high level signal and the fourth high level signal are not received, output a discharge signal when the fourth high level signal is received, output a charging signal when the second high level signal is received, and maintain the output state of the first pulse signal and output a second pulse signal when the fifth high level signal is received.

2. A flexible AC / DC hybrid power supply system according to claim 1, characterized in that: The DC control module includes a DC bus terminal, a first capacitor, a first unipolar transistor, a second unipolar transistor, a first resistor, a bidirectional converter, a first inductor and a first isolation transformer; the AC bus module includes an AC bus terminal; and the central control module includes an intelligent controller; The first end of the DC bus terminal is connected to the first end of the bidirectional converter and is connected to the drain of the first unipolar transistor and the source of the second unipolar transistor through the first capacitor. The gate of the first unipolar transistor is connected to the IO3 end of the intelligent controller and the gate of the second unipolar transistor and is connected to the second end of the DC bus terminal and the second end of the bidirectional converter through the first resistor. The third end of the bidirectional converter is connected to the first end of the primary side of the first isolation transformer through the first inductor. The second end of the primary side of the first isolation transformer is connected to the fourth end of the bidirectional converter. The first end and the second end of the secondary side of the first isolation transformer are respectively connected to the first end and the second end of the AC bus terminal. The drain of the second unipolar transistor is connected to the photovoltaic conversion module.

3. A flexible AC / DC hybrid power supply system according to claim 2, characterized in that: The photovoltaic conversion module includes a photovoltaic power generation source, a DC voltage stabilizer, a second capacitor, a first diode, a third unipolar transistor, a second resistor, a third capacitor, a second diode and a first inverter; The first end and the second end of the photovoltaic power generation source are connected to the first end and the second end of the DC voltage regulator respectively, the third end of the DC voltage regulator is connected to the anode of the first diode and is connected to the source of the third unipolar transistor through the second capacitor, the cathode of the second diode is connected to the first end of the first inverter, the cathode of the first diode is connected to the anode of the second diode and the drain of the second unipolar transistor and is connected to one end of the second resistor, the drain of the third unipolar transistor, the fourth end of the second rectifier and the second end of the first inverter through the third capacitor, the other end of the second resistor is connected to the gate of the third unipolar transistor and the IO2 end of the intelligent controller, and the third and fourth ends of the first inverter are connected to the transmission control module.

4. A flexible AC / DC hybrid power supply system according to claim 3, characterized in that: The energy storage control module includes a fourth unipolar transistor, a fifth unipolar transistor, a sixth unipolar transistor, a fourth capacitor and an energy storage device; The source of the fourth unipolar transistor is connected to the source of the third unipolar transistor, the drain of the fourth unipolar transistor is connected to the drain of the sixth unipolar transistor and the drain of the fifth unipolar transistor and is connected to the second end of the energy storage device and the second end of the first inverter through the fourth capacitor, the source of the sixth unipolar transistor is connected to the first end of the energy storage device, the source of the fifth unipolar transistor is connected to the cathode of the second diode, and the gates of the fourth unipolar transistor, the fifth unipolar transistor and the sixth unipolar transistor are respectively connected to the IO2 end, the IO1 end and the IO5 end of the intelligent controller.

5. A flexible AC / DC hybrid power supply system according to claim 4, characterized in that: The voltage transformation compensation module includes a second isolation transformer and a third isolation transformer; The first end and the second end of the primary side of the second isolation transformer are respectively connected to the first end and the second end of the AC bus terminal, the first end of the secondary side of the second isolation transformer is connected to the second end of the secondary side of the third isolation transformer, the first end of the secondary side of the third isolation transformer and the second end of the secondary side of the second isolation transformer are connected to the AC power supply module, and the first end and the second end of the primary side of the third isolation transformer are connected to the transmission control module.

6. A flexible AC / DC hybrid power supply system according to claim 5, characterized in that: The AC power supply module includes an AC power source, a fifth capacitor, a single-phase rectifier and a second inverter; The first end of the AC power supply is connected to the first end of the single-phase rectifier and connected to the second end of the single-phase rectifier and the second end of the AC power supply through the fifth capacitor. The third end and the fourth end of the single-phase rectifier are respectively connected to the first end and the second end of the second inverter. The third end and the fourth end of the second inverter are respectively connected to the first end of the secondary side of the third isolation transformer and the second end of the secondary side of the second isolation transformer.

7. A flexible AC / DC hybrid power supply system according to claim 6, characterized in that: The transmission control module includes a third resistor, a first thyristor, a second thyristor, a third thyristor and a first switch tube; The control end of the first thyristor is connected to the control end of the second thyristor and the collector of the first switch tube and is connected to the first end of the first inverter through the third resistor, one end of the first thyristor is connected to one end of the third thyristor and the third end of the first inverter, one end of the second thyristor is connected to the fourth end of the first inverter and the second end of the secondary side of the second isolation transformer, the other end of the third thyristor is connected to the first end of the secondary side of the second isolation transformer, the other end of the first thyristor and the other end of the second thyristor are connected to the first end and the second end of the AC bus terminal respectively, the control end of the third thyristor is connected to the base of the first switch tube and the IO4 terminal of the intelligent controller, and the emitter of the first switch tube is grounded.

8. The flexible AC / DC hybrid power supply system according to claim 4, characterized in that: The photovoltaic detection module includes a fourth resistor, a fifth resistor, a first detection device and a second detection device; The input end of the high-end detection device is connected to the input end of the second detection device and one end of the fifth resistor and is connected to the third end of the DC regulator through the fourth resistor. The other end of the fifth resistor is connected to the fourth end of the DC regulator. The output end of the high-voltage device and the output end of the second detection device are respectively connected to the IO10 end and IO6 end of the intelligent controller.

9. A flexible AC / DC hybrid power supply system according to claim 8, characterized in that: The energy storage detection module includes a seventh resistor, a sixth resistor, a third detection device and a fourth detection device; The input end of the third detection device is connected to the input end of the fourth detection device and one end of the sixth resistor and is connected to the first end of the energy storage device through the seventh resistor, the other end of the sixth resistor is connected to the second end of the energy storage device, and the output end of the third detection device and the output end of the fourth detection device are respectively connected to the IO7 end and IO8 end of the intelligent controller.

10. A flexible AC / DC hybrid power supply system according to claim 9, characterized in that: The energy storage detection module also includes a gate logic device; The A end and the B end of the gate logic device are connected to the output end of the second detection device and the output end of the fourth detection device respectively, and the Y end of the gate logic device is connected to the IO9 end of the intelligent controller.

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