A solar photovoltaic energy storage microgrid power station

Abstract

The present invention discloses a solar photovoltaic energy storage microgrid power station, which relates to the field of photovoltaic energy storage microgrid technology, including a photovoltaic power supply module for photoelectric conversion and output of multiple groups of electric energy; an intelligent control module for signal reception and module control; a first DC bus module for electric energy aggregation, distribution, boosting and transmission control; a balance control module for electric energy balance; a second DC bus module for electric energy aggregation and distribution and power supply to a microgrid and a bidirectional regulation module; a bidirectional regulation module for bidirectional transmission and regulation of electric energy; an energy storage module for energy storage and discharge and superposition processing with the electric energy transmitted by the electric energy control module; a voltage sampling module for voltage sampling; and an electric energy control module for powering the energy storage module when the voltages of the first DC bus module and the energy storage module are both lower than a set low voltage threshold. The solar photovoltaic energy storage microgrid power station of the present invention ensures stable photovoltaic power supply, reduces electric energy interference and improves the utilization rate of electric energy.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic energy storage microgrid, in particular to a solar photovoltaic energy storage microgrid power station. Background Art

[0002] With the continuous development of new energy technology and the rapid improvement of scientific and technological levels, in order to solve the power fluctuation and system instability problems caused by the randomness of photovoltaic power generation and load in the microgrid power supply, the existing solar photovoltaic energy storage microgrid power stations mostly use photovoltaic power generation, batteries, supercapacitors and microgrids to connect a DC bus together for hybrid energy storage and power supply, so as to provide stable power for the microgrid. However, when the power generated by the photovoltaic power and the power of the battery are both lower than a certain voltage value, it will be impossible to continue to provide power to the microgrid, resulting in a decrease in the utilization rate of photovoltaic power. In addition, since multiple groups of photovoltaic power generation and batteries, supercapacitors and microgrids are concentrated on a DC bus for complementary power supply, the power interference between the power sources is relatively large, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a solar photovoltaic energy storage microgrid power station to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A solar photovoltaic energy storage microgrid power station, comprising: a photovoltaic power supply module, an intelligent control module, a first DC bus module, a balance control module, a second DC bus module, a bidirectional regulation module, an energy storage module, a voltage sampling module and an electric energy control module;

[0006] A photovoltaic power supply module, connected to the intelligent control module, for performing photoelectric conversion and outputting the first photovoltaic electric energy and the second photovoltaic electric energy, for receiving the first pulse signal and the second pulse signal output by the intelligent control module and performing power regulation processing on the first photovoltaic electric energy and the second photovoltaic electric energy respectively, and for outputting the first electric energy and the second electric energy;

[0007] An intelligent control module, connected to the first DC bus module, the bidirectional regulation module, the power control module and the balance control module; used to output a first pulse signal and a second pulse signal, used to output a third pulse signal and control the power transmission and regulation of the first DC bus module, used to receive a first comparison signal and a second comparison signal output by the power control module and output a fourth pulse signal and a fifth pulse signal to control the voltage boost and voltage reduction of the bidirectional regulation module, used to receive a first control signal output by the power control module and output a sixth pulse signal to control the voltage boost, used to output a seventh pulse signal and an eighth pulse signal and control the energy storage and discharge of the balance control module;

[0008] A first DC bus module is connected to the photovoltaic power supply module, the balancing control module, the second DC bus module and the power control module, and is used to receive a third pulse signal and perform voltage boosting processing on the input first power, the second power and the power output by the balancing control module, and is used to transmit the first power and the second power to the balancing control module, and is used to transmit the boosted power to the second DC bus module, and is used to receive a first control signal output by the power control module and stop the transmission of power;

[0009] a balancing control module, configured to receive the seventh pulse signal and perform voltage boost processing on the first electric energy and the second electric energy transmitted by the first DC bus module, store the electric energy, and transmit the stored electric energy to the first DC bus module in response to the eighth pulse signal;

[0010] a second DC bus module, connected to the bidirectional regulation module, for aggregating the electric energy output by the bidirectional regulation module and the first DC bus module, for distributing the electric energy and transmitting the electric energy to the microgrid;

[0011] a bidirectional regulation module, connected to the energy storage module, for receiving the fourth pulse signal and performing a voltage-boosting process on the electric energy transmitted by the second DC bus module, for outputting the third electric energy, for receiving the fifth pulse signal and the sixth pulse signal and performing a voltage-reducing process on the electric energy output by the energy storage module, and for receiving the sixth pulse signal and performing a voltage-boosting process on the electric energy output by the energy storage module;

[0012] An energy storage module, connected to the power control module, for energy storage and discharge, and for superimposing the power transmitted by the power control module and the released power;

[0013] A voltage sampling module, connected to the energy storage module and the first DC bus module, for detecting the electric energy transmitted by the energy storage module and the first DC bus module and outputting a first sampling signal and a second sampling signal respectively;

[0014] The electric energy control module is connected to the voltage sampling module, and is used to set a low-voltage threshold and output a first comparison signal and a second comparison signal when the first sampling signal and the second sampling signal are both less than the low-voltage threshold, and is used to perform logic processing on the first comparison signal and the second comparison signal and output a first control signal, and is used to transmit the electric energy processed by the first DC bus module to the energy storage module.

[0015] As a further solution of the present invention: the photovoltaic power supply module includes a first photovoltaic device, a first capacitor, a first inductor, a first power tube, a first diode and a second photovoltaic control device; the first DC bus module includes a first DC bus; the intelligent control module includes a first controller;

[0016] Preferably, the first end of the first photovoltaic device is connected to one end of the first capacitor and is connected to the anode of the first diode and the drain of the first power tube through the first inductor, the source of the first power tube, the other end of the first capacitor, the second end of the first photovoltaic device and the ground end of the second photovoltaic control device are all connected to the second end and the ground end of the first DC bus, the first end of the first DC bus is connected to the cathode of the first diode and the output end of the second photovoltaic control device, and the gate of the first power tube and the control end of the second photovoltaic control device are respectively connected to the IO1 end and IO10 end of the first controller.

[0017] As a further solution of the present invention: the balancing control module includes a bidirectional adjustment device and a first supercapacitor;

[0018] Preferably, the first end and the second end of the bidirectional regulation device are respectively connected to the first end and the second end of the first DC bus, the third end of the bidirectional regulation device is connected to the fourth end of the bidirectional regulation device through the first supercapacitor, and the fifth end and the sixth end of the bidirectional regulation device are respectively connected to the IO8 end and the IO9 end of the first controller.

[0019] As a further solution of the present invention: the first DC bus module further includes a second capacitor, a second inductor, a second power tube, a second diode, a fifth resistor, a sixth power tube and a first switch tube;

[0020] Preferably, one end of the second capacitor is connected to the first end of the first DC bus and is connected to the drain of the second power tube and the anode of the second diode through the second inductor, the cathode of the second diode is connected to the drain of the sixth power tube and is connected to the gate of the sixth power tube and the collector of the first switching tube through the fifth resistor, the emitter of the first switching tube, the source of the second power tube and the other end of the second capacitor are all connected to the second end of the first DC bus, the gate of the first switching tube is connected to the IO7 end of the first controller and the power control module, the source of the sixth power tube is connected to the second DC bus module, and the gate of the second power tube is connected to the IO2 end of the first controller.

[0021] As a further solution of the present invention: the second DC bus module includes a microgrid interface and a second DC bus;

[0022] Preferably, the first end of the second DC bus is connected to the first end of the microgrid interface, the source of the sixth power tube and the bidirectional regulation module, and the second end of the second DC bus is connected to the second end of the microgrid interface.

[0023] As a further solution of the present invention: the bidirectional regulation module includes a third power tube, a third inductor, a fourth power tube and a fifth power tube; the energy storage module includes a third capacitor and an energy storage device;

[0024] Preferably, the drain of the third power tube is connected to the first end of the second DC bus and is connected to the source of the fifth power tube and the drain of the fourth power tube through the third inductor, the drain of the fifth power tube is connected to the first end of the third capacitor and the first end of the energy storage device, the source of the third power tube is connected to the second end of the second DC bus, the source of the fourth power tube, the second end of the third capacitor, the second end of the energy storage device and the ground, the gate of the third power tube and the gate of the fourth power tube are respectively connected to the IO3 end and IO4 end of the first controller, and the gate of the fifth power tube is connected to the IO5 end and IO6 end of the first controller.

[0025] As a further solution of the present invention: the voltage sampling module includes a first resistor, a second resistor, a third resistor and a fourth resistor;

[0026] Preferably, the first end of the first resistor is connected to the cathode of the second diode, the second end of the first resistor is connected to the power control module and connected to the source of the second power tube through the second resistor, the first end of the third resistor is connected to the first end of the energy storage device, and the second end of the third resistor is connected to the second end of the energy storage device through the fourth resistor.

[0027] As a further solution of the present invention: the power control module includes a seventh power tube, a first logic chip, a first comparator, a second comparator and a first threshold device;

[0028] Preferably, the drain of the seventh power tube is connected to the cathode of the second diode, the source of the seventh power tube is connected to the second end of the energy storage device, the gate of the seventh power tube is connected to the third end of the first logic chip, the IO7 end of the first controller and the base of the first switch tube, the first end of the first logic chip is connected to the output end of the first comparator and the IO11 end of the first controller, the second end of the first logic chip is connected to the output end of the second comparator and the IO12 end of the first controller, the in-phase end of the first comparator and the in-phase end of the second comparator are both connected to the first threshold device, and the inverting end of the first comparator and the inverting end of the second comparator are respectively connected to the second end of the first resistor and the second end of the second resistor.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the solar photovoltaic energy storage microgrid power station of the present invention uses the electric energy output by the balancing control module to balance the first DC bus module to ensure the stable power supply of the photovoltaic power supply module, the intelligent control module performs voltage boost processing on the first DC bus module and provides electric energy to the second DC bus module to reduce power interference, and supplies power to the bidirectional regulation module and the microgrid through the second DC bus module, and the bidirectional regulation module performs voltage boost and provides charging electric energy to the energy storage module. When the electric energy transmitted by the first DC bus module is reduced, the bidirectional regulation module performs voltage reduction processing on the electric energy released by the energy storage module to balance the electric energy of the second DC bus module. When the electric energy transmitted by the first DC bus module and the electric energy of the energy storage module are both lower than the set value, the electric energy control module will control the first DC bus module and the energy storage module to perform electric energy superposition, and then the bidirectional regulation module performs voltage boost processing to maintain the electric energy of the second DC bus module and improve the utilization rate of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 A schematic block diagram of a solar photovoltaic energy storage microgrid power station provided in an example of the present invention.

[0032] Figure 2 A circuit diagram of a solar photovoltaic energy storage microgrid power station provided for an example of the present invention.

[0033] Figure 3 A connection circuit diagram of an electric energy control module provided for an example of the present invention.

[0034] Figure 4 A connection circuit diagram of a balance control module provided for an example of the present invention. DETAILED DESCRIPTION

[0035] 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.

[0036] In one embodiment, see Figure 1, a solar photovoltaic energy storage microgrid power station, comprising: a photovoltaic power supply module 1, an intelligent control module 2, a first DC bus module 3, a balance control module 4, a second DC bus module 5, a bidirectional regulation module 6, an energy storage module 7, a voltage sampling module 8 and an electric energy control module 9;

[0037] Specifically, the photovoltaic power supply module 1 is connected to the intelligent control module 2, and is used for performing photoelectric conversion and outputting the first photovoltaic electric energy and the second photovoltaic electric energy, and is used for receiving the first pulse signal and the second pulse signal output by the intelligent control module 2 and performing power regulation processing on the first photovoltaic electric energy and the second photovoltaic electric energy respectively, and is used for outputting the first electric energy and the second electric energy;

[0038] The intelligent control module 2 is connected to the first DC bus module 3, the bidirectional regulation module 6, the power control module 9 and the balance control module 4; it is used to output the first pulse signal and the second pulse signal, to output the third pulse signal and control the power transmission and regulation of the first DC bus module 3, to receive the first comparison signal and the second comparison signal output by the power control module 9 and output the fourth pulse signal and the fifth pulse signal to control the boost and buck operation of the bidirectional regulation module 6, to receive the first control signal output by the power control module 9 and output the sixth pulse signal to control the boost operation, and to output the seventh pulse signal and the eighth pulse signal and control the energy storage and discharge operation of the balance control module 4;

[0039] The first DC bus module 3 is connected to the photovoltaic power supply module 1, the balance control module 4, the second DC bus module 5 and the power control module 9, and is used to receive the third pulse signal and boost the input first power, the second power and the power output by the balance control module 4, and transmit the first power and the second power to the balance control module 4, and transmit the boosted power to the second DC bus module 5, and receive the first control signal output by the power control module 9 and stop the power transmission;

[0040] The balance control module 4 is used to receive the seventh pulse signal and perform voltage boost processing on the first electric energy and the second electric energy transmitted by the first DC bus module 3, and is used for electric energy storage and transmits the stored electric energy to the first DC bus module 3 in response to the eighth pulse signal;

[0041] The second DC bus module 5 is connected to the bidirectional regulation module 6 and is used to aggregate the electric energy output by the bidirectional regulation module 6 and the first DC bus module 3, so as to distribute the electric energy and transmit the electric energy to the microgrid;

[0042] The bidirectional regulation module 6 is connected to the energy storage module 7, and is used to receive the fourth pulse signal and perform voltage boost processing on the electric energy transmitted by the second DC bus module 5, and to output the third electric energy, and is used to receive the fifth pulse signal and the sixth pulse signal and perform voltage reduction processing on the electric energy output by the energy storage module 7, and is used to receive the sixth pulse signal and perform voltage boost processing on the electric energy output by the energy storage module 7;

[0043] The energy storage module 7 is connected to the power control module 9 and is used for energy storage and discharge, and is used for superimposing the power transmitted by the power control module 9 and the released power;

[0044] A voltage sampling module 8, connected to the energy storage module 7 and the first DC bus module 3, for detecting the electric energy transmitted by the energy storage module 7 and the first DC bus module 3 and outputting a first sampling signal and a second sampling signal respectively;

[0045] The electric energy control module 9 is connected to the voltage sampling module 8, and is used to set a low-voltage threshold and output a first comparison signal and a second comparison signal when the first sampling signal and the second sampling signal are both less than the low-voltage threshold, and is used to perform logical processing on the first comparison signal and the second comparison signal and output a first control signal, and is used to transmit the electric energy processed by the first DC bus module 3 to the energy storage module 7.

[0046] In a specific embodiment, the photovoltaic power supply module 1 can adopt a photovoltaic power supply circuit composed of multiple groups of photovoltaic control devices to perform photoelectric conversion and the intelligent control module 2 can perform power regulation control according to the MPPT algorithm; the intelligent control module 2 can adopt a micro-control circuit, which integrates many components such as an arithmetic unit, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the first DC bus module 3 can adopt a first DC bus M1 composed of a DC bus, a power tube, an inductor, a triode, etc., which can aggregate and distribute electric energy, and perform boost processing and electric energy transmission control on the distributed electric energy; the balancing control module 4 can adopt a balancing control circuit composed of a bidirectional adjustment device and a supercapacitor, and the intelligent control module 2 performs charging and discharging control to control the electric energy balance of the first DC bus module 3; the second DC bus module 5 can adopt a DC bus and a micro The second DC bus module 5 composed of the grid interface realizes the aggregation and distribution of electric energy and provides electric energy for the microgrid; the above-mentioned bidirectional regulation module 6 can adopt a bidirectional regulation circuit composed of power tubes, inductors, etc., which can boost and reduce the voltage of the electric energy output by the energy storage device, boost the input electric energy and provide charging electric energy for the energy storage module 7; the above-mentioned energy storage module 7 can adopt an energy storage circuit composed of an energy storage device and a capacitor to store and release electric energy, and superimpose it with the electric energy output by the electric energy control module 9; the above-mentioned voltage sampling module 8 can adopt a voltage sampling circuit composed of resistors, etc., to perform voltage sampling on the electric energy output by the first DC bus module 3 and the electric quantity of the energy storage device; the above-mentioned electric energy control module 9 can adopt an electric energy control circuit composed of a comparator, a logic chip, a power tube, etc., to set a low-voltage threshold and judge the size relationship between the sampled voltage signal and the low-voltage threshold, so as to control the superposition state of electric energy and the electric energy output by the energy storage device.

[0047] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The photovoltaic power supply module 1 includes a first photovoltaic device, a first capacitor C1, a first inductor L1, a first power tube Q1, a first diode D1 and a second photovoltaic control device; the first DC bus module 3 includes a first DC bus M1; the intelligent control module 2 includes a first controller U1;

[0048] Specifically, the first end of the first photovoltaic device is connected to one end of the first capacitor C1 and is connected to the anode of the first diode D1 and the drain of the first power tube Q1 through the first inductor L1. The source of the first power tube Q1, the other end of the first capacitor C1, the second end of the first photovoltaic device and the ground end of the second photovoltaic control device are all connected to the second end and the ground end of the first DC bus M1. The first end of the first DC bus M1 is connected to the cathode of the first diode D1 and the output end of the second photovoltaic control device. The gate of the first power tube Q1 and the control end of the second photovoltaic control device are respectively connected to the IO1 end and the IO10 end of the first controller U1.

[0049] In a specific embodiment, the first photovoltaic device may be a photovoltaic panel; the first power tube Q1 may be an N-channel field effect tube; the circuit composition structure of the second photovoltaic control device is the same as the circuit composition structure of the first photovoltaic device, the first capacitor C1, the first inductor L1, the first power tube Q1 and the first diode D1, so as to realize photoelectric conversion and power regulation; the first controller U1 may be an STM32 microcontroller.

[0050] Furthermore, the balancing control module 4 includes a bidirectional regulating device and a first super capacitor SC1;

[0051] Specifically, the first end and the second end of the bidirectional regulation device are respectively connected to the first end and the second end of the first DC bus M1, the third end of the bidirectional regulation device is connected to the fourth end of the bidirectional regulation device through the first super capacitor SC1, and the fifth end and the sixth end of the bidirectional regulation device are respectively connected to the IO8 end and the IO9 end of the first controller U1.

[0052] In a specific embodiment, the bidirectional regulating device may adopt a Boost-Buck circuit to realize bidirectional transmission control of electric energy, so as to provide electric energy to the first super capacitor SC1 and transmit the electric energy output by the first super capacitor SC1.

[0053] Furthermore, the first DC bus module 3 further includes a second capacitor C2, a second inductor L2, a second power tube Q2, a second diode D2, a fifth resistor R5, a sixth power tube Q6 and a first switch tube VT1;

[0054] Specifically, one end of the second capacitor C2 is connected to the first end of the first DC bus M1 and is connected to the drain of the second power tube Q2 and the anode of the second diode D2 through the second inductor L2, the cathode of the second diode D2 is connected to the drain of the sixth power tube Q6 and is connected to the gate of the sixth power tube Q6 and the collector of the first switch tube VT1 through the fifth resistor R5, the emitter of the first switch tube VT1, the source of the second power tube Q2 and the other end of the second capacitor C2 are all connected to the second end of the first DC bus M1, the gate of the first switch tube VT1 is connected to the IO7 terminal of the first controller U1 and the power control module 9, the source of the sixth power tube Q6 is connected to the second DC bus module 5, and the gate of the second power tube Q2 is connected to the IO2 terminal of the first controller U1.

[0055] In a specific embodiment, the second power tube Q2 and the sixth power tube Q6 can both be N-channel field effect tubes, wherein the second power tube Q2 cooperates with the second inductor L2, the second capacitor C2 and the second diode D2 to perform boost processing, and the sixth power tube Q6 controls the transmission of electric energy to power the second DC bus module 5; the first switch tube VT1 can be an NPN transistor.

[0056] Further, the second DC bus module 5 includes a microgrid interface and a second DC bus M2;

[0057] Specifically, a first end of the second DC bus M2 is connected to a first end of the microgrid interface, a source of the sixth power tube Q6 and the bidirectional regulation module 6, and a second end of the second DC bus M2 is connected to a second end of the microgrid interface.

[0058] In a specific embodiment, the above-mentioned microgrid interface is connected to the power supply end of the microgrid to provide direct current power to the microgrid, which will not be described in detail here.

[0059] Further, the bidirectional regulation module 6 includes a third power tube Q3, a third inductor L3, a fourth power tube Q4 and a fifth power tube Q5; the energy storage module 7 includes a third capacitor C3 and an energy storage device;

[0060] Specifically, the drain of the third power tube Q3 is connected to the first end of the second DC bus M2 and is connected to the source of the fifth power tube Q5 and the drain of the fourth power tube Q4 through the third inductor L3, the drain of the fifth power tube Q5 is connected to the first end of the third capacitor C3 and the first end of the energy storage device, the source of the third power tube Q3 is connected to the second end of the second DC bus M2, the source of the fourth power tube Q4, the second end of the third capacitor C3, the second end of the energy storage device and the ground, the gate of the third power tube Q3 and the gate of the fourth power tube Q4 are respectively connected to the IO3 end and the IO4 end of the first controller U1, and the gate of the fifth power tube Q5 is connected to the IO5 end and the IO6 end of the first controller U1.

[0061] In a specific embodiment, the third power tube Q3, the fourth power tube Q4 and the fifth power tube Q5 can all be N-channel field effect tubes, wherein the third power tube Q3 cooperates with the third inductor L3 to perform a voltage boost process, and the fifth power tube Q5 cooperates with the third inductor L3 to perform a voltage drop process, the fifth power tube Q5 can also perform power transmission control, and the fourth power tube Q4 cooperates with the third inductor L3 to perform a voltage boost process; the energy storage device can use a lithium battery.

[0062] Further, the voltage sampling module 8 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4;

[0063] Specifically, the first end of the first resistor R1 is connected to the cathode of the second diode D2, the second end of the first resistor R1 is connected to the power control module 9 and connected to the source of the second power tube Q2 through the second resistor R2, the first end of the third resistor R3 is connected to the first end of the energy storage device, and the second end of the third resistor R3 is connected to the second end of the energy storage device through the fourth resistor R4.

[0064] In a specific embodiment, the first resistor R1 and the second resistor R2 perform voltage sampling on the electric energy transmitted by the second diode D2; and the third resistor R3 and the fourth resistor R4 perform voltage sampling on the energy storage device.

[0065] Further, the power control module 9 includes a seventh power tube Q7, a first logic chip U2, a first comparator A1, a second comparator A2 and a first threshold device;

[0066] Specifically, the drain of the seventh power tube Q7 is connected to the cathode of the second diode D2, the source of the seventh power tube Q7 is connected to the second end of the energy storage device, the gate of the seventh power tube Q7 is connected to the third end of the first logic chip U2, the IO7 end of the first controller U1 and the base of the first switch tube VT1, the first end of the first logic chip U2 is connected to the output end of the first comparator A1 and the IO11 end of the first controller U1, the second end of the first logic chip U2 is connected to the output end of the second comparator A2 and the IO12 end of the first controller U1, the in-phase end of the first comparator A1 and the in-phase end of the second comparator A2 are both connected to the first threshold device, and the inverting end of the first comparator A1 and the inverting end of the second comparator A2 are respectively connected to the second end of the first resistor R1 and the second end of the second resistor R2.

[0067] In a specific embodiment, the seventh power tube Q7 can be an N-channel field effect tube; the first logic chip U2 can be an AND gate logic chip; the first comparator A1 and the second comparator A2 can both be LM397 comparators; the first threshold device can be composed of a voltage source and a resistor divider circuit to provide a low voltage threshold.

[0068] In a solar photovoltaic energy storage microgrid power station of this embodiment, the first photovoltaic device performs photoelectric conversion, the first controller U1 controls the conduction of the first power tube Q1 according to the MPPT algorithm, and cooperates with the first inductor L1 and the first diode D1 to perform boost processing to provide power for the first DC bus M1. At the same time, the first controller U1 controls the photovoltaic power supply of the second photovoltaic control device to provide power for the first DC bus M1, and when the power of the first DC bus M1 is sufficient, the first controller U1 controls the bidirectional adjustment device to cooperate with the first super capacitor SC1 to complete In the electric energy storage work, when the electric energy of the first DC bus M1 is unbalanced or low, the first controller U1 controls the bidirectional regulation device to cooperate with the first super capacitor SC1 to perform discharge work to ensure the electric energy balance of the first DC bus M1, and the first controller U1 controls the conduction of the second power tube Q2, cooperates with the second inductor L2, the second capacitor C2 and the second diode D2 to boost the electric energy output by the first DC bus M1, and transmits it to the second DC bus M2 by the sixth power tube Q6, and the second DC bus M2 is used as the microgrid interface and the bidirectional regulation module 6. Provide electric energy. When the electric energy output by the first DC bus M1 is sufficient, the first controller U1 will control the fourth power tube Q4 to be turned on, cooperate with the third inductor L3 to perform a voltage boost process, and the fifth power tube Q5 will transmit it to the energy storage device for storage. When the electric energy provided by the first DC bus M1 is lower than the low-voltage threshold provided by the first threshold device, the first controller U1 will control the fifth power tube Q5 to be turned on, cooperate with the third inductor L3 to perform a voltage reduction process, and supply power to the second DC bus M2. When the electric energy provided by the first DC bus M1 and the electric energy of the energy storage module 7 are both lower than the low-voltage threshold, the first logic The third end of the logic chip U2 will output a high level to control the seventh power tube Q7 to be turned on, the first switch tube VT1 to be turned off, and the sixth power tube Q6 to be turned off. The electric energy output by the second diode D2 will be transmitted to the second end of the energy storage device, and will be connected in series with the energy storage device for power supply. At the same time, the first controller U1 will control the conduction of the third power tube Q3 and the fifth power tube Q5, and the fifth power tube Q5 will transmit the electric energy. The third power tube Q3 cooperates with the third inductor L3 to boost the electric energy output by the superimposed energy storage device to meet the power supply demand of the second DC bus M2.

[0069] 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.

[0070] 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 solar photovoltaic energy storage microgrid power station, characterized in that: The solar photovoltaic energy storage microgrid power station includes: a photovoltaic power supply module, an intelligent control module, a first DC bus module, a balance control module, a second DC bus module, a bidirectional regulation module, an energy storage module, a voltage sampling module and an electric energy control module; The photovoltaic power supply module is connected to the intelligent control module, and is used to perform photoelectric conversion and output the first photovoltaic electric energy and the second photovoltaic electric energy, and is used to receive the first pulse signal and the second pulse signal output by the intelligent control module and perform power regulation processing on the first photovoltaic electric energy and the second photovoltaic electric energy respectively, and is used to output the first electric energy and the second electric energy; The intelligent control module is connected to the first DC bus module, the bidirectional regulation module, the power control module and the balance control module; it is used to output the first pulse signal and the second pulse signal, to output the third pulse signal and control the power transmission and regulation of the first DC bus module, to receive the first comparison signal and the second comparison signal output by the power control module and output the fourth pulse signal and the fifth pulse signal to control the voltage boost and voltage reduction of the bidirectional regulation module, to receive the first control signal output by the power control module and output the sixth pulse signal to control the voltage boost, and to output the seventh pulse signal and the eighth pulse signal and control the energy storage and discharge of the balance control module; The first DC bus module is connected to the photovoltaic power supply module, the balancing control module, the second DC bus module and the power control module, and is used to receive the third pulse signal and perform voltage boosting processing on the input first power, the second power and the power output by the balancing control module, and is used to transmit the first power and the second power to the balancing control module, and is used to transmit the boosted power to the second DC bus module, and is used to receive the first control signal output by the power control module and stop the power transmission work; The balancing control module is used to receive the seventh pulse signal and perform voltage boost processing on the first electric energy and the second electric energy transmitted by the first DC bus module, store the electric energy and transmit the stored electric energy to the first DC bus module in response to the eighth pulse signal; The second DC bus module is connected to the bidirectional regulation module and is used to aggregate the electric energy output by the bidirectional regulation module and the first DC bus module, so as to distribute the electric energy and transmit the electric energy to the microgrid; The bidirectional regulation module is connected to the energy storage module, and is used to receive the fourth pulse signal and perform voltage boost processing on the electric energy transmitted by the second DC bus module, and to output the third electric energy, and is used to receive the fifth pulse signal and the sixth pulse signal and perform voltage reduction processing on the electric energy output by the energy storage module, and is used to receive the sixth pulse signal and perform voltage boost processing on the electric energy output by the energy storage module; The energy storage module is connected to the power control module and is used for energy storage and discharge, and is used for superimposing the power transmitted by the power control module and the released power; The voltage sampling module is connected to the energy storage module and the first DC bus module, and is used to detect the electric energy transmitted by the energy storage module and the first DC bus module and output a first sampling signal and a second sampling signal respectively; The electric energy control module is connected to the voltage sampling module, and is used to set a low-voltage threshold and output a first comparison signal and a second comparison signal when the first sampling signal and the second sampling signal are both less than the low-voltage threshold, and is used to perform logical processing on the first comparison signal and the second comparison signal and output a first control signal, and is used to transmit the electric energy processed by the first DC bus module to the energy storage module.

2. A solar photovoltaic energy storage microgrid power station according to claim 1, characterized in that: The photovoltaic power supply module includes a first photovoltaic device, a first capacitor, a first inductor, a first power tube, a first diode and a second photovoltaic control device; the first DC bus module includes a first DC bus; the intelligent control module includes a first controller; The first end of the first photovoltaic device is connected to one end of the first capacitor and connected to the anode of the first diode and the drain of the first power tube through the first inductor; the source of the first power tube, the other end of the first capacitor, the second end of the first photovoltaic device and the ground end of the second photovoltaic control device are all connected to the second end of the first DC bus and the ground end; the first end of the first DC bus is connected to the cathode of the first diode and the output end of the second photovoltaic control device; the gate of the first power tube and the control end of the second photovoltaic control device are respectively connected to the IO1 end and the IO10 end of the first controller; The circuit composition structure of the second photovoltaic control device is the same as the circuit composition structure of the first photovoltaic device, the first capacitor, the first inductor, the first power tube and the first diode, realizing photoelectric conversion and power regulation.

3. A solar photovoltaic energy storage microgrid power station according to claim 2, characterized in that: The balancing control module includes a bidirectional regulating device and a first supercapacitor; The first end and the second end of the bidirectional regulation device are respectively connected to the first end and the second end of the first DC bus, the third end of the bidirectional regulation device is connected to the fourth end of the bidirectional regulation device through the first supercapacitor, and the fifth end and the sixth end of the bidirectional regulation device are respectively connected to the IO8 end and the IO9 end of the first controller.

4. A solar photovoltaic energy storage microgrid power station according to claim 2, characterized in that: The first DC bus module also includes a second capacitor, a second inductor, a second power tube, a second diode, a fifth resistor, a sixth power tube and a first switch tube; One end of the second capacitor is connected to the first end of the first DC bus and is connected to the drain of the second power tube and the anode of the second diode through the second inductor, the cathode of the second diode is connected to the drain of the sixth power tube and is connected to the gate of the sixth power tube and the collector of the first switch tube through the fifth resistor, the emitter of the first switch tube, the source of the second power tube and the other end of the second capacitor are all connected to the second end of the first DC bus, the gate of the first switch tube is connected to the IO7 end of the first controller and the power control module, the source of the sixth power tube is connected to the second DC bus module, and the gate of the second power tube is connected to the IO2 end of the first controller.

5. A solar photovoltaic energy storage microgrid power station according to claim 4, characterized in that: The second DC bus module includes a microgrid interface and a second DC bus; The first end of the second DC bus is connected to the first end of the microgrid interface, the source of the sixth power tube and the bidirectional regulation module, and the second end of the second DC bus is connected to the second end of the microgrid interface.

6. A solar photovoltaic energy storage microgrid power station according to claim 5, characterized in that: The bidirectional regulation module includes a third power tube, a third inductor, a fourth power tube and a fifth power tube; the energy storage module includes a third capacitor and an energy storage device; The drain of the third power tube is connected to the first end of the second DC bus and is connected to the source of the fifth power tube and the drain of the fourth power tube through the third inductor. The drain of the fifth power tube is connected to the first end of the third capacitor and the first end of the energy storage device. The source of the third power tube is connected to the second end of the second DC bus, the source of the fourth power tube, the second end of the third capacitor, the second end of the energy storage device and the ground. The gate of the third power tube and the gate of the fourth power tube are respectively connected to the IO3 end and the IO4 end of the first controller. The gate of the fifth power tube is connected to the IO5 end and the IO6 end of the first controller.

7. A solar photovoltaic energy storage microgrid power station according to claim 6, characterized in that: The voltage sampling module includes a first resistor, a second resistor, a third resistor and a fourth resistor; The first end of the first resistor is connected to the cathode of the second diode, the second end of the first resistor is connected to the power control module and connected to the source of the second power tube through the second resistor, the first end of the third resistor is connected to the first end of the energy storage device, and the second end of the third resistor is connected to the second end of the energy storage device through the fourth resistor.

8. A solar photovoltaic energy storage microgrid power station according to claim 7, characterized in that: The power control module includes a seventh power tube, a first logic chip, a first comparator, a second comparator and a first threshold device; The drain of the seventh power tube is connected to the cathode of the second diode, the source of the seventh power tube is connected to the second end of the energy storage device, the gate of the seventh power tube is connected to the third end of the first logic chip, the IO7 end of the first controller and the base of the first switch tube, the first end of the first logic chip is connected to the output end of the first comparator and the IO11 end of the first controller, the second end of the first logic chip is connected to the output end of the second comparator and the IO12 end of the first controller, the in-phase end of the first comparator and the in-phase end of the second comparator are both connected to the first threshold device, and the inverting end of the first comparator and the inverting end of the second comparator are respectively connected to the second end of the first resistor and the second end of the second resistor.

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