An inductor-based smart grid voltage conversion control circuit

Abstract

This invention discloses an inductor-based intelligent grid voltage conversion control circuit, relating to the field of grid conversion technology. It includes a microcontroller module controlling an AC converter module to perform AC / DC regulation on AC power supplied by a wind turbine. During parallel discharge, the AC power is cut off, while an energy storage control module stores the AC power and connects it to the AC grid module. A DC grid module processes the power and connects to the DC grid. When the AC power is below a voltage threshold, an energy compensation module compensates the DC grid module, shortening its regulation cycle. When the AC converter module loses power, the AC grid module can supply power to the DC grid module. This inductor-based intelligent grid voltage conversion control circuit can meet the power distribution needs of different grid types, improve energy utilization, reduce the maximum output power of the AC converter module, lower the voltage withstand requirements of components, and improve power distribution efficiency.

Description

Technical Field

[0001] This invention relates to the field of power grid transformation technology, specifically an intelligent power grid voltage transformation control circuit based on an inductor. Background Technology

[0002] With the rapid rise of the new energy industry, research on wind power storage systems has received widespread attention. In existing technologies, the AC power output from wind turbines is DC-DC regulated by a boost circuit before being inverted and grid-connected by an inverter. However, when the AC power output from the wind turbine reaches its peak and is boosted, the output voltage will be greater than the input voltage. To improve circuit safety, the boost circuit needs to select components with higher voltage ratings. When the AC power output from the wind turbine is lower than the set voltage threshold, it will be unable to meet the power demand of the grid and will not be able to simultaneously control the power supply to both the AC and DC grids. Therefore, improvements are needed. Summary of the Invention

[0003] This invention provides an inductor-based smart grid voltage conversion control circuit to solve the problems mentioned in the background art.

[0004] According to an embodiment of the present invention, an inductor-based smart grid voltage conversion control circuit is provided, comprising: The AC conversion module is used to control two sets of inductors to store AC power supplied by the wind turbine, control the two sets of inductors to discharge in parallel, realize high power factor correction of AC power, AC-DC regulation of AC power, and output the first power. The energy storage control module, connected to the AC converter module, is used to rectify, regulate, and store AC power, release the stored energy, and control the transmission of power. The AC grid module, connected to the AC conversion module and the energy storage control module, is used to invert and filter the first electrical energy or the electrical energy released by the energy storage control module and feed the processed electrical energy into the AC grid. It also performs controllable rectification and power transmission control on the electrical energy provided by the AC grid and outputs the second electrical energy. The power compensation module, connected to the AC conversion module, is used to rectify and invert AC power and output compensated power. The DC grid module is connected to the AC conversion module, the power compensation module and the AC grid module. It is used to perform half-bridge inversion, LLC filtering, isolation transformation and rectification filtering on the first or second power energy and to feed the processed power energy into the DC grid. It also uses the received compensation power energy to perform voltage compensation processing on the power energy after isolation transformation. The microcontroller module, connected to the AC converter module, energy storage control module, AC grid module, DC grid module, and power compensation module, is used to control the AC converter module to store energy, control the energy storage control module to discharge during energy storage, control the AC converter module to discharge in parallel after the AC converter module stops storing energy, control the energy storage control module to regulate voltage and transmit power, control the AC grid module to perform inversion, control the DC grid module to perform half-bridge inversion, control the power compensation module to perform inversion when the AC power is lower than the set voltage threshold, and control the AC grid module to perform controllable rectification and power transmission when the AC converter module loses power.

[0005] As a further embodiment of the present invention: the AC conversion module includes an AC power interface, a first capacitor, a first diode, a second diode, a first power transistor, a first inductor, a third diode, and a fourth diode; the microcontroller module includes a first controller; Preferably, the first end of the AC interface is connected to one end of the first capacitor, the anode of the first diode, and the cathode of the second diode. The cathode of the first diode is connected to the collector of the first power transistor. The emitter of the first power transistor is connected to the cathode of the fourth diode and is connected to the anode of the second diode and the anode of the third diode through the first inductor. The gate of the first power transistor is connected to the IO1 terminal of the first controller. The anode of the fourth diode is grounded. The second end of the AC interface is connected to the other end of the first capacitor.

[0006] As a further embodiment of the present invention: the AC conversion module further includes a fifth diode, a sixth diode, a seventh diode, a second inductor, a third power transistor, and an eighth diode; Preferably, the cathode of the fifth diode is connected to the anode of the sixth diode and the second terminal of the AC interface; the anode of the fifth diode is connected to the anode of the seventh diode and connected to the cathode of the eighth diode and the emitter of the third power transistor through the second inductor; the collector of the third power transistor is connected to the cathode of the sixth diode; the gate of the third power transistor is connected to the IO3 terminal of the first controller; the anode of the eighth diode is connected to the anode of the fourth diode; and the cathode of the seventh diode is connected to the cathode of the third diode.

[0007] As a further embodiment of the present invention: the AC power grid module includes a second power transistor, a first inverter, a fifth capacitor, a fourth inductor, and an AC power grid; Preferably, the emitter of the second power transistor is connected to the cathode of the third diode, the collector of the second power transistor is connected to the first DC terminal of the first inverter, the second DC terminal of the first inverter is connected to the anode of the fourth diode, the first AC terminal of the first inverter is connected to one end of the fifth capacitor and connected to the first terminal of the AC power grid through the fourth inductor, the second AC terminal of the first inverter is connected to the other end of the fifth capacitor and the second terminal of the AC power grid, the inverter terminal and the rectifier terminal of the first inverter are respectively connected to the IO9 terminal and the IO10 terminal of the first controller, and the gate of the second power transistor is connected to the IO2 terminal of the first controller.

[0008] As a further embodiment of the present invention: the DC power grid module includes a fourth power transistor, a fifth power transistor, a second capacitor, a third inductor, a fifth inductor, a third capacitor, a first transformer, a second transformer, a ninth diode, a tenth diode, a fourth capacitor, and a DC power grid; Preferably, the collector of the fourth power transistor is connected to the emitter of the fifth power transistor and the cathode of the third diode, and is connected to one end of the fifth inductor and the first end of the primary side of the first transformer through the third inductor. The second end of the secondary side of the first transformer is connected to the first end of the secondary side of the second transformer. The second end of the secondary side of the second transformer is connected to the other end of the fifth inductor, and is connected to one end of the second capacitor, the emitter of the fourth power transistor, and the anode of the eighth diode through the third capacitor. The collector of the fifth power transistor is connected to the other end of the second capacitor. The first end of the secondary side of the first transformer is connected to the anode of the ninth diode. The cathode of the ninth diode is connected to the cathode of the tenth diode and the first end of the DC power grid, and is connected to the second end of the DC power grid and the second end of the secondary side of the first transformer through the fourth capacitor. The third end of the secondary side of the first transformer is connected to the anode of the tenth diode. The gates of the fourth power transistor and the fifth power transistor are respectively connected to the IO4 and IO5 terminals of the first controller.

[0009] As a further embodiment of the present invention: the energy storage control module includes a power conversion device, a sixth power transistor, a seventh power transistor, and an energy storage device; Preferably, the first input terminal and the second input terminal of the power conversion device are respectively connected to the first terminal and the second terminal of the AC interface; the first output terminal of the power conversion device is connected to the collector of the sixth power transistor; the emitter of the sixth power transistor is connected to the first terminal of the energy storage device and the collector of the seventh power transistor; the emitter of the seventh power transistor is connected to the first DC terminal of the first inverter; the second output terminal of the power conversion device is connected to the second terminal of the energy storage device and the first DC terminal of the first inverter; and the gate of the sixth power transistor and the gate of the seventh power transistor are respectively connected to the IO6 terminal and the IO7 terminal of the first controller.

[0010] As a further embodiment of the present invention: the power compensation module includes a first rectifier and a second inverter; Preferably, the first and second terminals of the first rectifier are respectively connected to the first and second terminals of the AC interface, the third and fourth terminals of the first rectifier are respectively connected to the first DC terminal and the second DC terminal of the second inverter, the first AC terminal and the second AC terminal of the second inverter are respectively connected to the first and second terminals of the primary side of the second transformer, and the inverter terminal of the second inverter is connected to the IO8 terminal of the first controller.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The intelligent grid voltage conversion control circuit based on inductors of the present invention can control the two sets of capacitors of the AC conversion module to store the AC power and control the parallel discharge state by the micro-control module. It performs high power factor correction on the AC power provided by the wind power generator and performs AC-DC regulation processing on the AC power. During parallel discharge, it stops superimposing with AC power, reduces the maximum value of the power output of the AC conversion module, and reduces the withstand voltage requirements of the components. At the same time, the energy storage control module stores AC power during parallel discharge, improves the power utilization rate, and performs grid connection processing through the AC grid module. The DC grid module processes the power during parallel discharge and connects it to the DC grid to meet the power distribution needs of different grid types. When the AC power is lower than the set voltage threshold, the power compensation module performs power compensation processing on the DC grid module, shortening the power regulation cycle of the DC grid module. When the AC conversion module loses power, the AC grid module can supply power to the DC grid module, improving power distribution efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic block diagram of a smart grid voltage conversion control circuit based on an inductor, provided as an embodiment of the present invention.

[0014] Figure 2 A circuit diagram of an inductor-based smart grid voltage conversion control circuit provided for an embodiment of the present invention.

[0015] Figure 3 The circuit diagram of the energy storage control module provided in the embodiment of the present invention.

[0016] Figure 4 The circuit diagram is provided for the power compensation module in an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In one embodiment, see Figure 1 A smart grid voltage conversion control circuit based on an inductor includes: an AC conversion module 1, an energy storage control module 2, an AC grid module 3, a DC grid module 4, an energy compensation module 5, and a microcontroller module 6. The AC conversion module 1 is used to control two sets of inductors to store the AC power provided by the wind turbine, control the two sets of inductors to discharge in parallel, realize high power factor correction of AC power, AC-DC regulation of AC power, and output the first power. The energy storage control module 2 is connected to the AC conversion module 1 and is used to rectify, regulate, and store AC power, release the stored power, and control the transmission of power. AC grid module 3 is connected to AC conversion module 1 and energy storage control module 2. It is used to invert and filter the first electrical energy or the electrical energy released by energy storage control module 2 and integrate the processed electrical energy into the AC grid. It also performs controllable rectification and power transmission control on the electrical energy provided by the AC grid and outputs the second electrical energy. The power compensation module 5 is connected to the AC conversion module 1 and is used to rectify and invert AC power and output compensated power. DC grid module 4 is connected to AC conversion module 1, power compensation module 5 and AC grid module 3. It is used to perform half-bridge inversion, LLC filtering, isolation transformer and rectification filtering on the first power or the second power and to connect the processed power into the DC grid. It also uses the received compensation power to perform voltage compensation processing on the power after isolation transformer. The microcontroller module 6 is connected to the AC converter module 1, the energy storage control module 2, the AC grid module 3, the DC grid module 4, and the power compensation module 5. It is used to control the AC converter module 1 to store energy, control the energy storage control module 2 to discharge during energy storage, control the AC converter module 1 to discharge in parallel after the AC converter stops storing energy, control the energy storage control module 2 to regulate voltage and transmit power, control the AC grid module 3 to perform inversion, control the DC grid module 4 to perform half-bridge inversion, control the power compensation module 5 to perform inversion when the AC power is lower than the set voltage threshold, and control the AC grid module 3 to perform controllable rectification and power transmission when the AC converter module 1 loses power.

[0019] In a specific embodiment, the AC conversion module 1 can be an AC conversion circuit composed of an AC interface, capacitors, diodes, IGBTs, inductors, etc. It can perform high power factor correction and AC / DC regulation of AC power during the positive and negative cycles of the AC power through energy storage and parallel discharge of two sets of capacitors. In each high-frequency switching cycle, the peak value of the inductor current is proportional to the instantaneous value of the AC power voltage, thus the envelope of all current peaks exhibits the same sinusoidal shape as the input voltage within one power frequency cycle. The energy storage control module 2 can be an energy storage control circuit composed of a power conversion device, IGBTs, and an energy storage device. It can rectify, DC-DC regulate, and control the energy storage of the input power, release the stored energy, and control the transmission of power. The AC grid module 3 can be a bidirectional inverter, IGBTs, AC... The AC grid circuit, composed of power grids, can perform inverter filtering and grid connection processing, and controllably rectify and control the power transmission of the AC grid-supplied power. The DC grid module 4 can be a DC grid circuit composed of IGBTs, inductors, transformers, diodes, etc., which can perform half-bridge inverter, and perform LLC filtering, isolation transformer, and rectification filtering processing on the inverted power before connecting it to the DC grid. It can also superimpose the power output of the power compensation module 5 with the power output after isolation transformer. The power compensation module 5 can be a rectifier and an inverter to rectify and invert the input power. The microcontroller module 6 can be a microcontroller circuit composed of a single-chip microcomputer, which integrates many components such as an arithmetic unit, a controller, a memory, and input / output devices to realize functions such as signal processing, data storage, module control, and timing control.

[0020] In this embodiment, please refer to Figure 2 , Figure 3 and Figure 4 The AC conversion module 1 includes an AC power interface, a first capacitor C1, a first diode D1, a second diode D2, a first power transistor Q1, a first inductor L1, a third diode D3, and a fourth diode D4; the microcontroller module 6 includes a first controller U1; Specifically, the first end of the AC interface is connected to one end of the first capacitor C1, the anode of the first diode D1, and the cathode of the second diode D2. The cathode of the first diode D1 is connected to the collector of the first power transistor Q1. The emitter of the first power transistor Q1 is connected to the cathode of the fourth diode D4 and is connected to the anode of the second diode D2 and the anode of the third diode D3 through the first inductor L1. The gate of the first power transistor Q1 is connected to the IO1 terminal of the first controller U1. The anode of the fourth diode D4 is grounded. The second end of the AC interface is connected to the other end of the first capacitor C1.

[0021] In a specific embodiment, the aforementioned AC power interface can be connected to the power supply terminal of the wind turbine generator, but is not limited to the wind turbine generator; the aforementioned first power transistor Q1 can be an IGBT; the aforementioned first controller U1 can be an STM32 microcontroller.

[0022] Furthermore, the AC conversion module 1 also includes a fifth diode D5, a sixth diode D6, a seventh diode D7, a second inductor L2, a third power transistor Q3, and an eighth diode D8; Specifically, the cathode of the fifth diode D5 is connected to the anode of the sixth diode D6 and the second terminal of the AC interface. The anode of the fifth diode D5 is connected to the anode of the seventh diode D7 and is connected to the cathode of the eighth diode D8 and the emitter of the third power transistor Q3 through the second inductor L2. The collector of the third power transistor Q3 is connected to the cathode of the sixth diode D6. The gate of the third power transistor Q3 is connected to the IO3 terminal of the first controller U1. The anode of the eighth diode D8 is connected to the anode of the fourth diode D4. The cathode of the seventh diode D7 is connected to the cathode of the third diode D3.

[0023] In a specific embodiment, the third power transistor Q3 can be an IGBT. During the negative half-cycle of the AC power, it controls the energy storage or parallel discharge of the first inductor L1 and the second inductor L2. In addition, the first capacitor C1 and the second capacitor C2 can also be controlled by the first power transistor Q1 to store energy or discharge in parallel during the positive half-cycle.

[0024] Furthermore, the AC grid module 3 includes a second power transistor Q2, a first inverter T1, a fifth capacitor C5, a fourth inductor L4, and an AC grid; Specifically, the emitter of the second power transistor Q2 is connected to the cathode of the third diode D3, the collector of the second power transistor Q2 is connected to the first DC terminal of the first inverter T1, the second DC terminal of the first inverter T1 is connected to the anode of the fourth diode D4, the first AC terminal of the first inverter T1 is connected to one end of the fifth capacitor C5 and connected to the first terminal of the AC power grid through the fourth inductor L4, the second AC terminal of the first inverter T1 is connected to the other end of the fifth capacitor C5 and the second terminal of the AC power grid, the inverter terminal and the rectifier terminal of the first inverter T1 are connected to the IO9 terminal and the IO10 terminal of the first controller U1, respectively, and the gate of the second power transistor Q2 is connected to the IO2 terminal of the first controller U1.

[0025] In a specific embodiment, the second power transistor Q2 can be an IGBT, which controls the power transmission and provides the second power to the DC grid module 4; the first inverter T1 can be composed of four IGBTs and four unidirectional thyristors, with each IGBT and each unidirectional thyristor connected in parallel. The first controller U1 provides four sets of drive signals to control the inverter and controllable rectification.

[0026] Furthermore, the DC grid module 4 includes a fourth power transistor Q4, a fifth power transistor Q5, a second capacitor C2, a third inductor L3, a fifth inductor L5, a third capacitor C3, a first transformer B1, a second transformer B2, a ninth diode D9, a tenth diode D10, a fourth capacitor C4, and a DC grid; Specifically, the collector of the fourth power transistor Q4 is connected to the emitter of the fifth power transistor Q5 and the cathode of the third diode D3, and is connected to one end of the fifth inductor L5 and the first end of the primary side of the first transformer B1 through the third inductor L3. The second end of the secondary side of the first transformer B1 is connected to the first end of the secondary side of the second transformer B2. The second end of the secondary side of the second transformer B2 is connected to the other end of the fifth inductor L5, and is connected to one end of the second capacitor C2, the emitter of the fourth power transistor Q4, and the anode of the eighth diode D8 through the third capacitor C3. The collector of the fifth power transistor Q5 is connected to the other end of the second capacitor C2. The first end of the secondary side of the first transformer B1 is connected to the anode of the ninth diode D9. The cathode of the ninth diode D9 is connected to the cathode of the tenth diode D10 and the first end of the DC power grid, and is connected to the second end of the DC power grid and the second end of the secondary side of the first transformer B1 through the fourth capacitor C4. The third end of the secondary side of the first transformer B1 is connected to the anode of the tenth diode D10. The gate of the fourth power transistor Q4 and the gate of the fifth power transistor Q5 are respectively connected to the IO4 and IO5 terminals of the first controller U1.

[0027] In a specific embodiment, both the fourth power transistor Q4 and the fifth power transistor Q5 can be IGBTs, which are used in conjunction with the AC converter module 1 for half-bridge inverter processing; both the first transformer B1 and the second transformer B2 can be high-frequency transformers.

[0028] Furthermore, the energy storage control module 2 includes a power conversion device, a sixth power transistor Q6, a seventh power transistor Q7, and an energy storage device; Specifically, the first input terminal and the second input terminal of the power conversion device are respectively connected to the first terminal and the second terminal of the AC interface. The first output terminal of the power conversion device is connected to the collector of the sixth power transistor Q6. The emitter of the sixth power transistor Q6 is connected to the first terminal of the energy storage device and the collector of the seventh power transistor Q7. The emitter of the seventh power transistor Q7 is connected to the first DC terminal of the first inverter T1. The second output terminal of the power conversion device is connected to the second terminal of the energy storage device and the first DC terminal of the first inverter T1. The gate of the sixth power transistor Q6 and the gate of the seventh power transistor Q7 are respectively connected to the IO6 terminal and the IO7 terminal of the first controller U1.

[0029] In a specific embodiment, the energy storage device can be a storage battery; the sixth power transistor Q6 and the seventh power transistor Q7 can both be IGBTs, with the sixth power transistor Q6 performing energy storage control and the seventh power transistor Q7 performing discharge control; the power conversion device can be composed of a rectifier and a Buck step-down circuit for rectification and voltage regulation.

[0030] Furthermore, the power compensation module 5 includes a first rectifier T2 and a second inverter T3; Specifically, the first and second terminals of the first rectifier T2 are connected to the first and second terminals of the AC interface, respectively; the third and fourth terminals of the first rectifier T2 are connected to the first DC terminal and the second DC terminal of the second inverter T3, respectively; the first AC terminal and the second AC terminal of the second inverter T3 are connected to the first and second terminals of the primary side of the second transformer B2, respectively; and the inverter terminal of the second inverter T3 is connected to the IO8 terminal of the first controller U1.

[0031] In a specific embodiment, the second inverter T3 may be composed of four IGBTs, which are driven by four sets of drive signals provided by the IO8 terminal of the first controller U1.

[0032] The working principle of an inductor-based smart grid voltage conversion control circuit of the present invention is as follows: It can be connected to a wind turbine and receive AC power via an AC interface. During the positive half-cycle of the AC power, the IO1 and IO4 terminals of the first controller U1 control the first power transistor Q1 and the fourth power transistor Q4 to conduct, respectively. This causes the first inductor L1 and the second inductor L2 to store energy in series, resulting in an increase in the inductor current. Furthermore, the fourth power transistor Q4 is turned on at zero voltage due to the current flowing through its body diode. The first power transistor Q1 is supported by the first inductor L1 and the second inductor L2. With near-zero current turn-on, the first controller U1 stops controlling the first power transistor Q1. At this time, the first inductor L1, the second inductor L2, the third diode D3, the fourth diode D4, the seventh diode D7, and the eighth diode D8 discharge in parallel. The AC power will no longer be in the power supply circuit, so that the output voltage does not increase further, reducing the maximum output power of the AC converter module 1 and reducing the voltage withstand requirements of the components. At the same time, the first controller U1 controls the alternating conduction of the fourth power transistor Q4 and the fifth power transistor Q5, both with a duty cycle of 0.5. With a dead time, it then undergoes half-bridge inverter processing to generate a high-frequency square wave voltage. This voltage, combined with the third inductor L3, the fifth inductor L5, the second capacitor C2, and the third capacitor C3, triggers resonance. After isolation transformation and rectification filtering through the first transformer B1, the ninth diode D9, the tenth diode D10, and the fourth capacitor C4, it is connected to the DC grid. Simultaneously, during the parallel discharge of the first inductor L1 and the second inductor L2, the IO6 terminal of the first controller U1 controls the sixth power transistor Q6 to conduct. The AC power is rectified and regulated by the power conversion device before being stored. The energy storage device stores energy, and the IO7 terminal of the first controller U1 controls the seventh power transistor Q7 to conduct. The IO9 terminal of the first controller U1 controls the first inverter T1 to perform inversion and power regulation. After filtering by the fourth inductor L4 and the fifth capacitor C5, the energy is connected to the grid to supply power to the AC power grid. Similarly, during the negative half-cycle of the AC power, the IO3 terminal of the first controller U1 controls the conduction state of the third power transistor Q3, thereby controlling the series energy storage and parallel discharge states of the first inductor L1 and the second inductor L2. During parallel discharge, the energy storage device is controlled to store energy to supply power to the AC power grid. When the AC power is supplied by a grid, and the AC power is lower than a set voltage threshold (which can be set as needed), it serves as a limit for voltage compensation. This shortens the power regulation cycle of the AC converter module 1 when the AC power voltage is low. Specifically, during the parallel discharge of the first inductor L1 and the second inductor L2, the first rectifier T2 rectifies the AC power. The IO8 terminal of the first controller U1 controls the second inverter T3 to perform inversion and power regulation. The voltage is then transformed by the second transformer B2 and superimposed on the voltage of the first transformer B1. The current is then rectified and filtered by diodes D9 (ninth), D10 (tenth), and C4 (fourth) before being fed into the DC grid. When AC power fails, the IO10 terminal of the first controller U1 controls the first inverter T1 to perform controllable rectification of the AC grid power. Simultaneously, the IO2 terminal of the first controller U1 controls the second power transistor Q2 to conduct and transmit power. The DC grid module 4 then performs half-bridge inversion, LLC filtering, isolation transformer, and rectification and filtering, and the processed power is fed into the DC grid to maintain the grid's power demand and improve power distribution efficiency.

[0033] It will be apparent to those skilled in the art that the present 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 its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A smart grid voltage conversion control circuit based on an inductor, characterized in that, The circuit includes: The AC conversion module is used to control two sets of inductors to store AC power supplied by the wind turbine, control the two sets of inductors to discharge in parallel, realize high power factor correction of AC power, AC-DC regulation of AC power, and output the first power. The energy storage control module, connected to the AC converter module, is used to rectify, regulate, and store AC power, release the stored energy, and control the transmission of power. The AC grid module, connected to the AC conversion module and the energy storage control module, is used to invert and filter the first electrical energy or the electrical energy released by the energy storage control module and feed the processed electrical energy into the AC grid. It also performs controllable rectification and power transmission control on the electrical energy provided by the AC grid and outputs the second electrical energy. The power compensation module, connected to the AC conversion module, is used to rectify and invert AC power and output compensated power. The DC grid module is connected to the AC conversion module, the power compensation module and the AC grid module. It is used to perform half-bridge inversion, LLC filtering, isolation transformation and rectification filtering on the first or second power energy and to feed the processed power energy into the DC grid. It also uses the received compensation power energy to perform voltage compensation processing on the power energy after isolation transformation. The microcontroller module, connected to the AC converter module, energy storage control module, AC grid module, DC grid module, and power compensation module, is used to control the AC converter module to store energy, control the energy storage control module to discharge during energy storage, control the AC converter module to discharge in parallel after the AC converter module stops storing energy, control the energy storage control module to regulate voltage and transmit power, control the AC grid module to perform inversion, control the DC grid module to perform half-bridge inversion, control the power compensation module to perform inversion when the AC power is lower than the set voltage threshold, and control the AC grid module to perform controllable rectification and power transmission when the AC converter module loses power.

2. The inductor-based smart grid voltage conversion control circuit according to claim 1, characterized in that, The AC conversion module includes an AC power interface, a first capacitor, a first diode, a second diode, a first power transistor, a first inductor, a third diode, and a fourth diode; the microcontroller module includes a first controller; The first end of the AC interface is connected to one end of the first capacitor, the anode of the first diode, and the cathode of the second diode. The cathode of the first diode is connected to the collector of the first power transistor. The emitter of the first power transistor is connected to the cathode of the fourth diode and is connected to the anode of the second diode and the anode of the third diode through the first inductor. The gate of the first power transistor is connected to the IO1 terminal of the first controller. The anode of the fourth diode is grounded. The second end of the AC interface is connected to the other end of the first capacitor.

3. The inductor-based smart grid voltage conversion control circuit according to claim 2, characterized in that, The AC conversion module also includes a fifth diode, a sixth diode, a seventh diode, a second inductor, a third power transistor, and an eighth diode; The cathode of the fifth diode is connected to the anode of the sixth diode and the second terminal of the AC interface. The anode of the fifth diode is connected to the anode of the seventh diode and is connected to the cathode of the eighth diode and the emitter of the third power transistor through the second inductor. The collector of the third power transistor is connected to the cathode of the sixth diode. The gate of the third power transistor is connected to the IO3 terminal of the first controller. The anode of the eighth diode is connected to the anode of the fourth diode. The cathode of the seventh diode is connected to the cathode of the third diode.

4. The inductor-based smart grid voltage conversion control circuit according to claim 3, characterized in that, The AC power grid module includes a second power transistor, a first inverter, a fifth capacitor, a fourth inductor, and an AC power grid. The emitter of the second power transistor is connected to the cathode of the third diode, the collector of the second power transistor is connected to the first DC terminal of the first inverter, the second DC terminal of the first inverter is connected to the anode of the fourth diode, the first AC terminal of the first inverter is connected to one end of the fifth capacitor and connected to the first terminal of the AC power grid through the fourth inductor, the second AC terminal of the first inverter is connected to the other end of the fifth capacitor and the second terminal of the AC power grid, the inverter terminal and the rectifier terminal of the first inverter are respectively connected to the IO9 terminal and the IO10 terminal of the first controller, and the gate of the second power transistor is connected to the IO2 terminal of the first controller.

5. The inductor-based smart grid voltage conversion control circuit according to claim 4, characterized in that, The DC power grid module includes a fourth power transistor, a fifth power transistor, a second capacitor, a third inductor, a fifth inductor, a third capacitor, a first transformer, a second transformer, a ninth diode, a tenth diode, a fourth capacitor, and a DC power grid; The collector of the fourth power transistor is connected to the emitter of the fifth power transistor and the cathode of the third diode, and is connected to one end of the fifth inductor and the first end of the primary side of the first transformer through the third inductor. The second end of the secondary side of the first transformer is connected to the first end of the secondary side of the second transformer. The second end of the secondary side of the second transformer is connected to the other end of the fifth inductor, and is connected to one end of the second capacitor, the emitter of the fourth power transistor, and the anode of the eighth diode through the third capacitor. The collector of the fifth power transistor is connected to the other end of the second capacitor. The first end of the secondary side of the first transformer is connected to the anode of the ninth diode. The cathode of the ninth diode is connected to the cathode of the tenth diode and the first end of the DC power grid, and is connected to the second end of the DC power grid and the second end of the secondary side of the first transformer through the fourth capacitor. The third end of the secondary side of the first transformer is connected to the anode of the tenth diode. The gates of the fourth power transistor and the fifth power transistor are respectively connected to the IO4 and IO5 terminals of the first controller.

6. The inductor-based smart grid voltage conversion control circuit according to claim 4, characterized in that, The energy storage control module includes a power conversion device, a sixth power transistor, a seventh power transistor, and an energy storage device; The first input terminal and the second input terminal of the power conversion device are respectively connected to the first terminal and the second terminal of the AC interface. The first output terminal of the power conversion device is connected to the collector of the sixth power transistor. The emitter of the sixth power transistor is connected to the first terminal of the energy storage device and the collector of the seventh power transistor. The emitter of the seventh power transistor is connected to the first DC terminal of the first inverter. The second output terminal of the power conversion device is connected to the second terminal of the energy storage device and the first DC terminal of the first inverter. The gate of the sixth power transistor and the gate of the seventh power transistor are respectively connected to the IO6 terminal and the IO7 terminal of the first controller.

7. The inductor-based smart grid voltage conversion control circuit according to claim 5, characterized in that, The power compensation module includes a first rectifier and a second inverter. The first and second terminals of the first rectifier are respectively connected to the first and second terminals of the AC interface. The third and fourth terminals of the first rectifier are respectively connected to the first DC terminal and the second DC terminal of the second inverter. The first AC terminal and the second AC terminal of the second inverter are respectively connected to the first and second terminals of the primary side of the second transformer. The inverter terminal of the second inverter is connected to the IO8 terminal of the first controller.

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