Optical storage and servo integrated machine based on device multiplexing and modulation method

Abstract

The application discloses a light storage servo integrated machine and a modulation method based on device multiplexing. The light storage servo integrated machine comprises a DC-AC servo driver, a low-voltage direct-current storage module, a bus capacitor and a photovoltaic module. The DC-AC servo driver comprises three bridge arms. The low-voltage direct-current storage module comprises a storage battery, a storage switch tube S7 and a direct-current storage inductor. The photovoltaic module comprises a photovoltaic power generation panel, a photovoltaic inductor, a photovoltaic switch tube S8 and a diode D1. The application has the advantages of compact structure, high switch tube multiplexing rate, and can realize photovoltaic end-to-storage, photovoltaic end-to-grid and photovoltaic end-to-storage and grid, and various energy interactions of storage and grid under different conditions. Different modulation methods can be selected according to external light intensity and user's use, different switch combinations are adopted, the driver output under multiple modes is met, and the stability of the direct-current bus voltage is ensured by combining variable duty cycle control.

Description

Technical Field

[0001] This invention relates to the field of optical storage servo integrated machines, and more particularly to optical storage servo integrated machines and modulation methods based on device reuse. Background Technology

[0002] Currently, power generation systems based on three-phase photovoltaic (PV) drives are widely used in new energy power generation, smart grids, and distributed energy. However, the output characteristics of PV arrays are greatly affected by light intensity and ambient temperature, and the DC-side capacitance of high-power-density converters is usually small. During sudden changes in light intensity or load fluctuations, the DC bus voltage is prone to oscillation or instability, resulting in increased harmonic current in the drive motor and decreased system efficiency. Furthermore, existing PV energy storage systems are complex in structure, large in size, have low integration, and are costly.

[0003] Existing three-stage optical storage topologies, such as Figure 1 As shown, the DC-DC converter stores photovoltaic energy in the battery, and then supplies it to the DC-AC servo drive after being converted by the subsequent DC-DC converter. It can store the photovoltaic energy of the photovoltaic panel in the battery, and can still drive the servo drive when the light is insufficient, ensuring the stability of the DC bus voltage of the drive and suppressing the current harmonics of the drive motor.

[0004] However, in this existing technology, the system employs a single energy transmission path design, requiring all electrical energy to pass through the battery. This architecture not only increases energy loss but also reduces the overall system efficiency. Secondly, there are significant shortcomings in regenerative braking energy recovery; the regenerated electrical energy generated during motor braking cannot be effectively fed back to the battery for storage, resulting in energy waste. Furthermore, the battery lacks autonomous control over charging and discharging, failing to intelligently adjust charging and discharging strategies according to operating conditions, thus affecting battery lifespan. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated optical storage servo machine and modulation method based on device reuse.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a photovoltaic-storage servo integrated machine based on device reuse, including a DC-AC servo driver, a low-voltage DC energy storage module, a bus capacitor, and a photovoltaic module;

[0008] The DC-AC servo driver includes three bridge arms, each with an upper bridge arm tube and a lower bridge arm tube. The midpoints of the three bridge arms are respectively connected to the three-phase output of an external motor. The upper bridge arm tubes of the three bridge arms are connected to one end of the bus capacitor, and the lower bridge arm tubes of the three bridge arms are connected to the other end of the bus capacitor.

[0009] The low-voltage direct-current energy storage module comprises an energy storage battery, an energy storage switch tube S7 and a direct-current energy storage inductor, the energy storage switch tube S7 is arranged on the lower bridge arm of the third bridge arm and located between the bridge arm lower tube of the third bridge arm and the other end of the bus capacitor, the positive electrode of the energy storage battery is connected to the common connection point between the energy storage switch tube S7 and the bridge arm lower tube of the third bridge arm through the direct-current energy storage inductor, and the negative electrode of the energy storage battery is connected to the other end of the bus capacitor.

[0010] The photovoltaic module comprises a photovoltaic power generation panel, a photovoltaic inductor, a photovoltaic switch tube S8 and a diode D1, the photovoltaic power generation panel and the photovoltaic inductor are connected in series and are connected in parallel with the photovoltaic switch tube S8, one end of the photovoltaic switch tube S8 is connected to the positive electrode of the diode D1, the other end of the photovoltaic switch tube S8 is connected to the other end of the bus capacitor, and the negative electrode of the diode D1 is connected to one end of the bus capacitor.

[0011] In a second aspect, the application provides a modulation method of the optical storage and servo integrated machine based on device reuse, which comprises the following steps:

[0012] judging the current light condition and the use condition of the user;

[0013] if the light condition meets the use condition and the energy storage battery does not need to be charged, only three-phase alternating current output is needed, then the three-phase switching step of driving the motor by the photovoltaic panel when the light condition meets the use condition is executed;

[0014] if the light condition meets the use condition and the energy storage battery needs to be charged, then the mode switching step of charging the energy storage battery when the light condition meets the use condition is executed;

[0015] if the light condition meets the use condition, the energy storage battery needs to be charged, and three-phase alternating current output is needed, then the three-phase switching step of simultaneously supplying the energy storage battery and the motor when the light condition meets the use condition is executed;

[0016] if the light condition does not meet the use condition and the user wants to use the external motor, the energy of the device is supplied by the energy storage battery, then the three-phase switching step of discharging the energy storage battery to drive the motor when the light condition does not meet the use condition is executed.

[0017] Further, for the three-phase switching step of driving the motor by the photovoltaic panel when the light condition meets the use condition, the three phases respectively comprise a first phase, a second phase and a third phase, the energy storage switch tube S7 is the bridge arm lower tube corresponding to the bridge arm of the third phase, and the three-phase switching step of driving the motor by the photovoltaic panel when the light condition meets the use condition comprises the following sub-steps:

[0018] in the first mode, the bridge arm upper tubes of the two-phase bridge arms of the second phase and the first phase are closed and the bridge arm lower tubes are turned on, the bridge arm upper tube of the bridge arm of the third phase is turned on and the bridge arm lower tube is closed, and the photovoltaic switch tube S8 is closed;

[0019] In the second mode, the upper bridge arm tube of the bridge arm of the first phase is turned on, the upper bridge arm tube of the bridge arm of the first phase and the upper bridge arm tube of the bridge arm of the third phase are turned off, and the lower bridge arm tube of the bridge arm of the third phase is turned on; the photovoltaic switch tube S8 is turned on;

[0020] In the third mode, the upper bridge arm tube of the bridge arm of the second phase is turned on, the upper bridge arm tube of the bridge arm of the second phase and the upper bridge arm tube of the bridge arm of the first phase are turned off, and the lower bridge arm tube of the bridge arm of the first phase is turned on.

[0021] Further, for the mode switching step of charging the energy storage battery when the light meets the condition, the mode switching step comprises the following sub-steps:

[0022] In the first mode, the lower bridge arm tube of the third bridge arm and the lower bridge arm tube of the third bridge arm are turned on, and the bus capacitor charges the energy storage battery; at the same time, the photovoltaic panel flows through the photovoltaic inductor and the photovoltaic switch tube S8;

[0023] In the second mode, the lower bridge arm tube of the third bridge arm and the lower bridge arm tube of the third bridge arm are turned off, the energy storage switch tube S7 is turned on, and the direct current energy storage inductor flows through the energy storage switch tube S7;

[0024] In the third mode, the photovoltaic switch tube S8 is turned off, the photovoltaic panel and the photovoltaic inductor charge the bus capacitor, and the energy storage battery still flows.

[0025] Further, for the three-phase switching step of simultaneously supplying the energy storage battery and the motor when the light meets the condition, the three phases respectively comprise a first phase, a second phase and a third phase, and the three-phase switching step of simultaneously supplying the energy storage battery and the motor when the light meets the condition comprises the following sub-steps:

[0026] In the first mode, the upper bridge arm tube of the two-phase bridge arm of the second phase and the first phase is turned off, the lower bridge arm tube is turned on, the upper bridge arm tube and the lower bridge arm tube of the bridge arm of the third phase are turned on; the energy storage switch tube S7 is turned off, and the photovoltaic switch tube S8 is turned on;

[0027] In the second mode, the lower bridge arm tube of the bridge arm of the third phase is turned off, and the energy storage switch tube S7 is turned on;

[0028] In the third mode, the upper bridge arm tube of the bridge arm of the second phase is turned on, the upper bridge arm tube of the bridge arm of the second phase and the upper bridge arm tube of the bridge arm of the third phase are turned off, and the lower bridge arm tube of the bridge arm of the third phase is turned on; the photovoltaic switch tube S8 is turned off;

[0029] In the fourth mode, the upper bridge arm tube of the bridge arm of the first phase is turned on, the upper bridge arm tube of the bridge arm of the first phase and the upper bridge arm tube of the bridge arm of the second phase are turned off, and the lower bridge arm tube of the bridge arm of the second phase is turned on; the photovoltaic switch tube S8 is turned on.

[0030] Further, the three-phase switching step of discharging the energy storage battery to drive the motor when the light does not meet the condition includes the following sub-steps:

[0031] In the first mode, the bridge upper tube of the bridge arm of the second phase and the first phase is closed, the bridge lower tube is turned on, the bridge upper tube of the bridge arm of the third phase is turned on, and the bridge lower tube is closed; the energy storage switch tube S7 is turned on, and the photovoltaic switch tube S8 is closed;

[0032] In the second mode, the bridge lower tube of the bridge arm of the third phase is turned on, and the energy storage switch tube S7 is closed;

[0033] In the third mode, the bridge upper tube of the bridge arm of the first phase is turned on, the bridge lower tube of the bridge arm of the first phase and the bridge upper tube of the bridge arm of the third phase are closed; the energy storage switch tube S7 is turned on;

[0034] In the fourth mode, the bridge upper tube of the bridge arm of the second phase is turned on, the bridge lower tube of the bridge arm of the second phase and the bridge upper tube of the bridge arm of the first phase are closed, and the bridge lower tube of the bridge arm of the first phase is turned on.

[0035] The beneficial effects of the present application are:

[0036] In an exemplary embodiment of the present application, the light storage servo integrated machine has a compact structure, high switch tube multiplexing rate, and can realize photovoltaic end to energy storage, photovoltaic end to grid side, photovoltaic end to energy storage and grid side, and various energy interactions of energy storage and grid side under different conditions. Different modulation methods can be selected according to the external light intensity and the use of the user, different switch combinations are used to meet the output of the driver under multiple modes, and the variable duty cycle control is combined to ensure the stability of the direct current bus voltage. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic diagram of a three-stage light storage topology of the prior art;

[0038] Figure 2 It is a schematic diagram of the light storage servo integrated machine based on device multiplexing provided in an exemplary embodiment of the present application;

[0039] Figure 3 It is a flowchart of the modulation method of the light storage servo integrated machine based on device multiplexing provided in an exemplary embodiment of the present application;

[0040] Figure 4 It is a schematic diagram of the photovoltaic driving motor when the light meets the condition in another exemplary embodiment of the present application;

[0041] Figure 5 It is a schematic diagram of the energy storage battery charging when the light meets the condition in another exemplary embodiment of the present application;

[0042] Figure 6 a schematic diagram of the energy storage battery and the motor supplying power simultaneously when the light meets the condition provided in another exemplary embodiment of the present application;

[0043] Figure 7 a schematic diagram of the energy storage battery discharging to drive the motor when the light does not meet the condition provided in another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] Reference is made to Figure 2 , Figure 2 a schematic diagram of the light storage servo all-in-one machine based on device multiplexing provided in an exemplary embodiment of the present application is shown, including a DC-AC servo driver, a low-voltage direct-current energy storage module, a bus capacitor and a photovoltaic module;

[0046] The DC-AC servo driver includes three bridge arms, each of which is provided with an upper bridge arm tube (S1, S2, S3) and a lower bridge arm tube (S4, S5, S6), and the midpoints of the three bridge arms are connected with three-phase outputs of an external motor; the upper bridge arm tubes (S1, S2, S3) of the three bridge arms are connected with one end of the bus capacitor Cbus, and the lower bridge arm tubes (S4, S5, S6) of the three bridge arms are connected with the other end of the bus capacitor Cbus;

[0047] The low-voltage direct-current energy storage module includes an energy storage battery Vdc, an energy storage switch tube S7 and a direct-current energy storage inductor Ldc, the energy storage switch tube S7 is arranged on the lower bridge arm of the third bridge arm and located between the lower bridge arm tube of the third bridge arm and the other end of the bus capacitor Cbus, the positive electrode of the energy storage battery Vdc is connected to the common connection point between the energy storage switch tube S7 and the lower bridge arm tube of the third bridge arm through the direct-current energy storage inductor Ldc, and the negative electrode of the energy storage battery Vdc is connected with the other end of the bus capacitor Cbus;

[0048] The photovoltaic module comprises a photovoltaic power generation panel VPV, a photovoltaic inductor LPV, a photovoltaic switch tube S8 and a diode D1, the photovoltaic power generation panel VPV and the photovoltaic inductor LPV are connected in series, then are connected in parallel with the photovoltaic switch tube S8, one end of the photovoltaic switch tube S8 is connected with the positive electrode of the diode D1, the other end of the photovoltaic switch tube S8 is connected with the other end of the bus capacitor Cbus, and the negative electrode of the diode D1 is connected with one end of the bus capacitor Cbus.

[0049] Specifically, in the present exemplary embodiment, the light storage servo integrated machine has a compact structure, a high switch tube multiplexing rate, and can realize photovoltaic end-to-storage, photovoltaic end-to-grid, photovoltaic end-to-storage and grid, and various energy interactions between storage and grid under different conditions. According to the external light intensity and the use condition of the user, different modulation methods can be selected, different switch combinations can be used to meet the output of the driver under multiple modes, and the variable duty cycle control can be used to ensure the stability of the direct current bus voltage.

[0050] Specifically:

[0051] (1) High bus voltage stability: The present application is relative to the direct current bus voltage stability control, does not depend on accurate power measurement, and avoids the influence of sensor noise on system stability.

[0052] (2) High converter integration: The functions of photovoltaic, storage interface and driver are integrated in a single converter, reducing the power conversion link. High power density, low cost, and high control freedom can realize photovoltaic end-to-storage, photovoltaic end-to-grid, photovoltaic end-to-storage and grid, and various energy interactions between storage and grid.

[0053] (3) Transmission path design: A multi-modal current path is constructed to realize parallel processing of motor driving and energy recovery, and an energy transmission channel completely independent of the storage battery is constructed.

[0054] The following content will elaborate on "selecting different modulation methods according to the external light intensity and the use condition of the user, and using different switch combinations to meet the output of the driver under multiple modes":

[0055] Referring to Figure 3 , Figure 3 Fig. 1 shows a flowchart of a modulation method of a light storage servo integrated machine based on device multiplexing provided in another exemplary embodiment of the present application, comprising the following steps: Figure 2

[0056] determine the current light condition and the use condition of the user:

[0057] If the light meets the use condition and the storage battery does not need to be charged, only three-phase alternating current output is needed, then the three-phase switching step of the photovoltaic motor driving under the condition that the light meets the condition is executed; ​

[0058] If the light meets the use condition, only the energy storage battery needs to be charged, the light meets the condition of the energy storage battery charging mode switching step is executed;

[0059] If the light meets the use condition, the energy storage battery needs to be charged, and three-phase alternating current output is needed at the same time, the light meets the condition of the energy storage battery and motor simultaneous supply three-phase switching step is executed;

[0060] If the light condition is not met, and the user wants to use the external motor, the device energy is supplied by the energy storage battery, the light does not meet the condition of the energy storage battery discharging driving motor three-phase switching step is executed.

[0061] Specifically, in the present exemplary embodiment, the light storage servo integrated machine based on device reuse can be adjusted in different ways according to the light condition and the use of the user.

[0062] More preferably, in an exemplary embodiment, as shown in Figure 4 For the light meets the condition of the photovoltaic driving motor three-phase switching step, the three phases include the first phase, the second phase and the third phase, the energy storage switch tube S7 is the bridge arm down tube corresponding to the third phase bridge arm, and the light meets the condition of the photovoltaic driving motor three-phase switching step includes the following sub-steps:

[0063] In the first mode, the bridge arm up tube of the two-phase bridge arm of the second phase and the first phase is closed, the bridge arm down tube is turned on, the bridge arm up tube of the bridge arm of the third phase is turned on, and the bridge arm down tube is closed; the photovoltaic switch tube S8 is closed;

[0064] In the second mode, the bridge arm up tube of the bridge arm of the first phase is turned on, the bridge arm down tube of the bridge arm of the first phase, the bridge arm up tube of the bridge arm of the third phase is closed, and the bridge arm down tube of the bridge arm of the third phase is turned on; the photovoltaic switch tube S8 is turned on;

[0065] In the third mode, the bridge arm up tube of the bridge arm of the second phase is turned on, the bridge arm down tube of the bridge arm of the second phase, the bridge arm up tube of the bridge arm of the first phase is closed, and the bridge arm down tube of the bridge arm of the first phase is turned on.

[0066] Specifically, in the present exemplary embodiment, as shown in Figure 4 Taking the first phase as A phase, the third phase as C phase and the second phase as B phase as an example, the energy storage switch tube S7 is the bridge arm down tube corresponding to the third phase bridge arm, if the light meets the use condition, and the energy storage battery does not need to be charged, only three-phase alternating current output is needed, the specific process is as follows:

[0067] In the first mode, the upper bridge arm tubes (S1, S2) of the two-phase bridge arms of the A phase and the B phase are closed, the lower bridge arm tubes (S4, S5) are turned on, the upper bridge arm tube S3 of the bridge arm of the C phase is turned on, and the lower bridge arm tube S6 is closed; the photovoltaic switch tube S8 is closed; at this time, the C phase is turned on, the A phase and the B phase flow through the lower bridge arm tubes S4 and S5, the energy storage unit Vdc does not work, the switching signals of the lower bridge arm tube S6 of the bridge arm of the third phase and the energy storage switch tube S7 are the same, and the photovoltaic switch tube S8 of the photovoltaic module is turned off to provide energy for the bus capacitor Cbus.

[0068] In the second mode, the upper bridge arm tube S1 of the bridge arm of the A phase is turned on, switched from the C phase to the A phase, the lower bridge arm tube S5 of the bridge arm of the B phase, the lower bridge arm tube S6 of the bridge arm of the C phase, and the energy storage switch tube S7 are turned on for current flow, the photovoltaic switch tube S8 is turned on, and the photovoltaic panel VPV inputs energy to the photovoltaic inductor LPV to accumulate energy, preparing to press the photovoltaic voltage to the bus capacitor Cbus.

[0069] In the third mode, the upper bridge arm tube S2 of the bridge arm of the B phase is turned on, switched from the A phase to the B phase, the lower bridge arm tube S4 of the bridge arm of the A phase, the lower bridge arm tube S6 of the bridge arm of the C phase, and the energy storage switch tube S7 flow, and the photovoltaic switch tube S8 is still turned on.

[0070] Through the MPPT algorithm combined with the duty cycle control of the photovoltaic switch tube S8, a stable bus voltage is obtained, and then through the control of the inverter, the output of photovoltaic to three-phase alternating current is realized, at this time, the energy storage function is not needed.

[0071] More preferably, in an exemplary embodiment, as shown in Figure 5 For the mode switching step of charging the energy storage battery when the light meets the condition, the following sub-steps are included:

[0072] In the first mode, the lower bridge arm tube of the third bridge arm and the lower bridge arm tube of the third bridge arm are turned on, and the bus capacitor charges the energy storage battery; at the same time, the photovoltaic panel flows through the photovoltaic inductor and the photovoltaic switch tube S8 for current flow;

[0073] In the second mode, the lower bridge arm tube of the third bridge arm and the lower bridge arm tube of the third bridge arm are closed, the energy storage switch tube S7 is turned on, and the direct current energy storage inductor flows through the energy storage switch tube S7 for current flow;

[0074] In the third mode, the photovoltaic switch tube S8 is turned off, the photovoltaic panel and the photovoltaic inductor charge the bus capacitor, and the energy storage battery still flows.

[0075] Specifically, in the present exemplary embodiment, as shown in Figure 5 Taking the first phase as the A phase, the third phase as the C phase, and the second phase as the B phase as an example, if the light meets the use condition, only the energy storage battery needs to be charged, and the photovoltaic voltage is boosted and then stepped down to charge the energy storage battery Vdc. The specific process is as follows:

[0076] In the first mode, the upper bridge arm tube S3 of the bridge arm of the C phase and the lower bridge arm tube S6 of the bridge arm of the C phase are turned on, the bus capacitor Cbus charges the energy storage battery Vdc, and the photovoltaic panel VPV continues to flow through the photovoltaic inductor LPV and the photovoltaic switch tube S8.

[0077] In the second mode, the upper bridge arm tube S3 of the bridge arm of the C phase and the lower bridge arm tube S6 of the bridge arm of the C phase are turned off, the energy storage switch tube S7 is turned on, and the direct current energy storage inductor Ldc continues to flow through the energy storage switch tube S7.

[0078] In the third mode, the photovoltaic switch tube S8, the photovoltaic input of the photovoltaic panel VPV charges the bus capacitor Cbus through the photovoltaic inductor LPV inductor, and the energy storage battery Vdc still continues to flow.

[0079] More preferably, in an exemplary embodiment, as shown in Figure 6 For the three-phase switching step of the energy storage battery and the motor simultaneously supplying when the illumination satisfies the condition, the three phases respectively include a first phase, a second phase and a third phase, and the three-phase switching step of the energy storage battery and the motor simultaneously supplying when the illumination satisfies the condition includes the following sub-steps:

[0080] In the first mode, the upper bridge arm tube of the two-phase bridge arm of the second phase and the first phase is closed, the lower bridge arm tube is turned on, the upper bridge arm tube and the lower bridge arm tube of the bridge arm of the third phase are turned on, the energy storage switch tube S7 is closed, and the photovoltaic switch tube S8 is turned on.

[0081] In the second mode, the lower bridge arm tube of the bridge arm of the third phase is closed, and the energy storage switch tube S7 is turned on.

[0082] In the third mode, the upper bridge arm tube of the bridge arm of the second phase is turned on, the lower bridge arm tube of the bridge arm of the second phase, the upper bridge arm tube of the bridge arm of the third phase are closed, the lower bridge arm tube of the bridge arm of the third phase is turned on, and the photovoltaic switch tube S8 is closed.

[0083] In the fourth mode, the upper bridge arm tube of the bridge arm of the first phase is turned on, the lower bridge arm tube of the bridge arm of the first phase, the upper bridge arm tube of the bridge arm of the second phase are closed, the lower bridge arm tube of the bridge arm of the second phase is turned on, and the photovoltaic switch tube S8 is turned on.

[0084] Specifically, in the present exemplary embodiment, as shown in Figure 6 Taking the first phase as the A phase, the third phase as the C phase and the second phase as the B phase as an example, if the illumination satisfies the use condition, the energy storage battery needs to be charged at the same time, and three-phase alternating current output is needed at the same time, a hybrid energy storage scheme can be combined with the "mode switching step of the energy storage battery charging when the illumination satisfies the condition" to constitute a hybrid energy storage scheme, the photovoltaic power supply is given priority, the energy storage smoothes fluctuations, and the remaining power drives the motor, further reducing the direct current voltage fluctuation when driving the motor. The specific process is as follows:

[0085] In the first mode, the bus capacitor Cbus simultaneously supplies power to the energy storage battery Vdc and the external motor M. Phases A and B are freewheeled through the lower tubes S4 and S5 of the bridge arm. The upper tubes S3 and S6 of the bridge arm of phase C are connected, and power is supplied to the external motor M through the upper tube S3 of the bridge arm of phase C. The upper tubes S3 and S6 of the bridge arm of phase C also supply power to the energy storage battery Vdc.

[0086] In the second mode, the lower arm transistor S6 of the C-phase bridge arm is turned off, the energy storage switch transistor S7 is turned on, the energy storage battery Vdc freewheels, and the bus capacitor Cbus supplies power to the external motor M separately.

[0087] In the third mode, the external motor M is powered by the bus capacitor Cbus. Phase A flows through the lower tube S4 of the bridge arm of phase A, and phase C flows through the lower tube S6 of the bridge arm of phase C, with the energy storage switch tube S7 freewheeling.

[0088] In the fourth mode, the upper tube S1 of the bridge arm of phase A is turned on, and phase B flows through the lower tube S5 of the bridge arm of phase B, and phase C flows through the lower tube S6 of the bridge arm of phase C, with the energy storage switch tube S7 continuing the current.

[0089] More preferably, in an exemplary embodiment, such as Figure 7 As shown, the three-phase switching steps for the energy storage battery discharge drive motor when the illumination condition is not met include the following sub-steps:

[0090] In the first mode, the upper tubes of the two-phase bridge arms of the second and first phases are closed and the lower tubes are open, while the upper tubes of the bridge arms of the third phase are open and the lower tubes are closed; the energy storage switch S7 is open and the photovoltaic switch S8 is closed.

[0091] In the second mode, the lower tube of the bridge arm of the third phase is turned on, and the energy storage switch tube S7 is turned off;

[0092] In the third mode, the upper tube of the first phase bridge arm is turned on, the lower tube of the first phase bridge arm and the upper tube of the third phase bridge arm are turned off; the energy storage switch tube S7 is turned on.

[0093] In the fourth mode, the upper pipe of the second phase bridge arm is on, the lower pipe of the second phase bridge arm and the upper pipe of the first phase bridge arm are off, and the lower pipe of the first phase bridge arm is on.

[0094] Specifically, in this exemplary embodiment, as Figure 7As shown, taking the example that the first phase is A phase, the third phase is C phase and the second phase is B phase, when the light condition is not satisfied and the user wants to use the device, the device energy is shared by the energy storage battery. The specific process is described as follows:

[0095] In the first mode, the bus capacitor Cbus supplies energy to the external motor M, the A phase flows through the bridge lower tube S4 of the A phase bridge arm, the B phase flows through the bridge lower tube S5 of the B phase bridge arm, the C phase flows through the bridge upper tube S3 of the C phase bridge arm and the energy storage switch tube S7, and the energy storage battery Vdc supplies energy to accumulate energy.

[0096] In the second mode, the energy storage switch tube S7 is turned off, the bridge lower tube S6 of the C phase bridge arm is turned on, and the energy storage battery Vdc supplies energy to the bus capacitor Cbus.

[0097] In the third mode, the bus capacitor Cbus supplies energy to the external motor M, the B phase flows through the bridge lower tube S5 of the B phase bridge arm, the C phase flows through the bridge lower tube S6 of the C phase bridge arm, and the energy storage switch tube S7 flows.

[0098] In the fourth mode, the bridge upper tube S2 of the B phase bridge arm is turned on, the A phase flows through the bridge lower tube S4 of the A phase bridge arm, the C phase flows through the bridge lower tube S6 of the C phase bridge arm, and the energy storage switch tube S7 flows.

[0099] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments, and on the basis of the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A modulation method for an integrated optical storage servo system based on device multiplexing, characterized in that: The light storage servo integrated machine comprises a DC-AC servo driver, a low-voltage direct-current energy storage module, a bus capacitor and a photovoltaic module. The DC-AC servo driver comprises three bridge arms, each of which is provided with an upper bridge arm and a lower bridge arm, and the midpoints of the three bridge arms are connected with three-phase outputs of an external motor; the upper bridge arms of the three bridge arms are connected with one end of the bus capacitor, and the lower bridge arms of the three bridge arms are connected with the other end of the bus capacitor. The low-voltage direct-current energy storage module comprises an energy storage battery, an energy storage switch tube S7 and a direct-current energy storage inductor, the energy storage switch tube S7 is arranged on the lower bridge arm of the third bridge arm and located between the lower bridge arm of the third bridge arm and the other end of the bus capacitor, the positive electrode of the energy storage battery is connected with a common connection point between the energy storage switch tube S7 and the lower bridge arm of the third bridge arm through the direct-current energy storage inductor, and the negative electrode of the energy storage battery is connected with the other end of the bus capacitor. The photovoltaic module comprises a photovoltaic power generation panel, a photovoltaic inductor, a photovoltaic switch tube S8 and a diode D1, the photovoltaic power generation panel and the photovoltaic inductor are connected in series and are connected in parallel with the photovoltaic switch tube S8, one end of the photovoltaic switch tube S8 is connected with the positive electrode of the diode D1, the other end of the photovoltaic switch tube S8 is connected with the other end of the bus capacitor, and the negative electrode of the diode D1 is connected with one end of the bus capacitor. The modulation method comprises the following steps: judging the current light condition and the use condition of a user; if the light condition meets the use condition and the energy storage battery does not need to be charged, only three-phase alternating current output is needed, then the three-phase switching step of the photovoltaic motor under the condition that the light condition meets the use condition is executed; if the light condition meets the use condition and only the energy storage battery needs to be charged, then the mode switching step of the energy storage battery charging under the condition that the light condition meets the use condition is executed; if the light condition meets the use condition, the energy storage battery needs to be charged, and three-phase alternating current output is needed, then the three-phase switching step of the energy storage battery and the motor supplying simultaneously under the condition that the light condition meets the use condition is executed; if the light condition does not meet the use condition and the user wants to use the external motor, the energy of the device is supplied by the energy storage battery, then the three-phase switching step of the energy storage battery discharging to drive the motor under the condition that the light condition does not meet the use condition is executed.

2. The modulation method of the optical storage and servo all-in-one machine based on device multiplexing according to claim 1, characterized in that: For the three-phase switching step of the photovoltaic motor under the condition that the light condition meets the use condition, the three phases respectively comprise a first phase, a second phase and a third phase, the energy storage switch tube S7 is the lower bridge arm of the third phase bridge arm, and the three-phase switching step of the photovoltaic motor under the condition that the light condition meets the use condition comprises the following sub-steps: in the first mode, the upper bridge arms of the two-phase bridge arms of the second phase and the first phase are closed, the lower bridge arms of the two-phase bridge arms are turned on, the upper bridge arm of the bridge arm of the third phase is turned on, and the lower bridge arm of the bridge arm is closed; the photovoltaic switch tube S8 is closed; in the second mode, the upper bridge arm of the bridge arm of the first phase is turned on, the lower bridge arm of the bridge arm of the first phase, the upper bridge arm of the bridge arm of the third phase is closed, and the lower bridge arm of the bridge arm of the third phase is turned on; the photovoltaic switch tube S8 is turned on; in the third mode, the upper bridge arm of the bridge arm of the second phase is turned on, the lower bridge arm of the bridge arm of the second phase, the upper bridge arm of the bridge arm of the first phase is closed, and the lower bridge arm of the bridge arm of the first phase is turned on.

3. The modulation method of the optical storage and servo all-in-one machine based on device multiplexing according to claim 1, characterized in that: For the mode switching step of the energy storage battery charging under the condition that the light condition meets the use condition, the following sub-steps are included: In the first mode, the bridge upper tube of the third bridge arm and the bridge lower tube of the third bridge arm are turned on, and the bus capacitor charges the energy storage battery; at the same time, the photovoltaic panel charges the bus capacitor through the photovoltaic inductor and the photovoltaic switch S8; In the second mode, the bridge upper tube of the third bridge arm and the bridge lower tube of the third bridge arm are turned off, and the energy storage switch S7 is turned on, and the direct-current energy storage inductor charges through the energy storage switch S7; In the third mode, the photovoltaic switch S8 is turned off, the photovoltaic panel and the photovoltaic inductor charge the bus capacitor, and the energy storage battery still charges.

4. The modulation method of the optical storage and servo all-in-one machine based on device multiplexing according to claim 1, characterized in that: For the three-phase switching step of the energy storage battery and the motor supplying at the same time when the light meets the condition, the three phases include the first phase, the second phase and the third phase, and the three-phase switching step of the energy storage battery and the motor supplying at the same time when the light meets the condition includes the following sub-steps: In the first mode, the bridge upper tube of the third bridge arm and the bridge lower tube of the third bridge arm are turned off, and the energy storage switch S7 is turned on, and the direct-current energy storage inductor charges through the energy storage switch S7; The energy storage switch S7 is turned off, and the photovoltaic switch S8 is turned on; In the second mode, the bridge lower tube of the third bridge arm is turned off, and the energy storage switch S7 is turned on; In the third mode, the bridge upper tube of the second bridge arm is turned on, the bridge lower tube of the second bridge arm and the bridge upper tube of the third bridge arm are turned off, and the bridge lower tube of the third bridge arm is turned on; the photovoltaic switch S8 is turned off; In the fourth mode, the bridge upper tube of the first bridge arm is turned on, the bridge lower tube of the first bridge arm and the bridge upper tube of the second bridge arm are turned off, and the bridge lower tube of the second bridge arm is turned on; the photovoltaic switch S8 is turned on.

5. The modulation method of the optical storage and servo all-in-one machine based on device multiplexing according to claim 1, characterized in that: For the three-phase switching step of the energy storage battery and the motor supplying at the same time when the light meets the condition, the three phases include the first phase, the second phase and the third phase, and the three-phase switching step of the energy storage battery and the motor supplying at the same time when the light meets the condition includes the following sub-steps: In the first mode, the bridge upper tube of the third bridge arm and the bridge lower tube of the third bridge arm are turned off, and the energy storage switch S7 is turned on, and the direct-current energy storage inductor charges through the energy storage switch S7; In the second mode, the bridge lower tube of the third bridge arm is turned on, and the energy storage switch S7 is turned off; In the third mode, the bridge upper tube of the first bridge arm is turned on, the bridge lower tube of the first bridge arm and the bridge upper tube of the third bridge arm are turned off; the energy storage switch S7 is turned on; In the fourth mode, the bridge upper tube of the second bridge arm is turned on, the bridge lower tube of the second bridge arm and the bridge upper tube of the first bridge arm are turned off, and the bridge lower tube of the first bridge arm is turned on.

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